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| FAIL2BANACTIVATION=1
IPT="/sbin/iptables"
SPAMLIST="blockedip"
SPAMDROPMSG="BLOCKED IP DROP"
SERVER_IP=("XXX.XXX.XXX.XXX" "XXX.XXX.XXX.XXX" "XXX.XXX.XXX.XXX")
SSHPORT=XXXX
echo "Starting IPv4 Wall..."
$IPT -F
$IPT -X
$IPT -t nat -F
$IPT -t nat -X
$IPT -t mangle -F
$IPT -t mangle -X
modprobe ip_conntrack
modprobe ip_conntrack_ftp
[ -f /etc/scripts/blocked.ips.txt ] && BADIPS=$(egrep -v -E "^#|^$" /etc/scripts/blocked.ips.txt)
PUB_IF="eth0"
#unlimited
$IPT -A INPUT -i lo -j ACCEPT
$IPT -A OUTPUT -o lo -j ACCEPT
# DROP all incomming traffic
$IPT -P INPUT DROP
$IPT -P OUTPUT DROP
$IPT -P FORWARD DROP
if [ -f /etc/scripts/blocked.ips.txt ];
then
# create a new iptables list
$IPT -N $SPAMLIST
for ipblock in $BADIPS
do
$IPT -A $SPAMLIST -s $ipblock -j DROP
done
$IPT -I INPUT -j $SPAMLIST
$IPT -I OUTPUT -j $SPAMLIST
$IPT -I FORWARD -j $SPAMLIST
fi
# Block sync
$IPT -A INPUT -i ${PUB_IF} -p tcp ! --syn -m state --state NEW -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "Drop Sync"
$IPT -A INPUT -i ${PUB_IF} -p tcp ! --syn -m state --state NEW -j DROP
# Block Fragments
$IPT -A INPUT -i ${PUB_IF} -f -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "Fragments Packets"
$IPT -A INPUT -i ${PUB_IF} -f -j DROP
# Block w00tw00t
$IPT -I INPUT -p tcp --dport 80 -m string --to 70 --algo bm --string 'GET /w00tw00t.at.ISC.SANS.' -j LOG --log-prefix "wootwoot "
$IPT -I INPUT -p tcp --dport 80 -m string --to 70 --algo bm --string 'GET /w00tw00t.at.ISC.SANS.' -j DROP
# Block bad stuff
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL FIN,URG,PSH -j LOG --log-level 4 --log-prefix "ALL FIN,URG,PSH"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL ALL -j LOG --log-level 4 --log-prefix "ALL ALL"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL ALL -j DROP
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL NONE -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "NULL Packets"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags ALL NONE -j DROP # NULL packets
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-level 4 --log-prefix "SYN,RST SYN,RST"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags SYN,FIN SYN,FIN -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "XMAS Packets"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP #XMAS
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags FIN,ACK FIN -m limit --limit 5/m --limit-burst 7 -j LOG --log-level 4 --log-prefix "Fin Packets Scan"
$IPT -A INPUT -i ${PUB_IF} -p tcp --tcp-flags FIN,ACK FIN -j DROP # FIN packet scans
# Allow ssh
$IPT -A INPUT -p tcp --destination-port $SSHPORT -j ACCEPT
$IPT -A OUTPUT -p tcp --source-port $SSHPORT -j ACCEPT
$IPT -A OUTPUT -p tcp --destination-port $SSHPORT -j ACCEPT
$IPT -A INPUT -p tcp --source-port $SSHPORT -j ACCEPT
# allow incomming ICMP ping pong stuff
$IPT -A INPUT -p icmp --icmp-type 8 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
$IPT -A OUTPUT -p icmp --icmp-type 0 -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A OUTPUT -p tcp --sport 1024:65535 --dport 53 -j ACCEPT
$IPT -A OUTPUT -p udp --sport 1024:65535 --dport 53 -j ACCEPT
$IPT -A INPUT -p tcp --sport 53 --dport 1024:65535 -j ACCEPT
$IPT -A INPUT -p udp --sport 53 --dport 1024:65535 -j ACCEPT
# Ouverture de ports
for ip in ${SERVER_IP[@]}
do
# Port 80 IN
$IPT -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d $ip --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A OUTPUT -p tcp -s $ip --sport 80 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
# Port 80 OUT
$IPT -A OUTPUT -p tcp -s $ip --sport 1024:65535 -d 0/0 --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A INPUT -p tcp -s 0/0 --sport 80 -d $ip --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
# Port 443 IN
$IPT -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d $ip --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A OUTPUT -p tcp -s $ip --sport 443 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
# Port 443 OUT
$IPT -A OUTPUT -p tcp -s $ip --sport 1024:65535 -d 0/0 --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A INPUT -p tcp -s 0/0 --sport 443 -d $ip --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
# Port 8282 IN
$IPT -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d $ip --dport 8282 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A OUTPUT -p tcp -s $ip --sport 8282 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
# Allow FTP connections @ port 21
$IPT -A INPUT -p tcp -d $ip --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPT -A OUTPUT -p tcp -s $ip --sport 21 -m state --state ESTABLISHED -j ACCEPT
# Allow Active FTP Connections
$IPT -A INPUT -p tcp --dport 20 -d $ip -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A OUTPUT -p tcp --sport 20 -s $ip -m state --state ESTABLISHED -j ACCEPT
# Allow Passive FTP Connections
$IPT -A INPUT -p tcp -d $ip --sport 1024: --dport 29799:29899 -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPT -A OUTPUT -p tcp -s $ip --dport 1024: --sport 29799:29899 -m state --state ESTABLISHED,RELATED -j ACCEPT
done
# Ouverture pour nrpe
$IPT -A INPUT -p tcp --dport 5666 -s XXX.XXX.XXX.XXX -j ACCEPT
#----------------------------------------------------------------------------
# Mail STUFF
# Mail SMTP:25
iptables -A INPUT -p tcp --dport 25 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 25 -j ACCEPT
iptables -A INPUT -p tcp --sport 25 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 25 -j ACCEPT
#Mail SMTP:587
iptables -A INPUT -p tcp --dport 587 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 587 -j ACCEPT
iptables -A INPUT -p tcp --sport 587 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 587 -j ACCEPT
# Mail POP3:110
iptables -A INPUT -p tcp --dport 110 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 110 -j ACCEPT
iptables -A INPUT -p tcp --sport 110 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 110 -j ACCEPT
# Mail IMAP:143
iptables -A INPUT -p tcp --dport 143 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 143 -j ACCEPT
iptables -A INPUT -p tcp --sport 143 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 143 -j ACCEPT
# Mail POP3S:995
iptables -A INPUT -p tcp --dport 995 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 995 -j ACCEPT
iptables -A INPUT -p tcp --sport 995 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 995 -j ACCEPT
#Mail IMAPS:993
iptables -A INPUT -p tcp --dport 993 -j ACCEPT
iptables -A OUTPUT -p tcp --dport 993 -j ACCEPT
iptables -A INPUT -p tcp --sport 993 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 993 -j ACCEPT
#------------------------------------------------------------------------------
# Ouverture divers port utiles
for ip in ${SERVER_IP[@]}
do
$IPT -A INPUT -p tcp --sport mysql -s XXX.XXX.XXX.XXX -d $ip -j ACCEPT
$IPT -A OUTPUT -p tcp --dport mysql -d XXX.XXX.XXX.XXX -s $ip -j ACCEPT
#Web Service
$IPT -A INPUT -p tcp --sport 1972 -s XXX.XXX.XXX.XXX -d $ip -j ACCEPT
$IPT -A OUTPUT -p tcp --dport 1972 -d XXX.XXX.XXX.XXX -s $ip -j ACCEPT
#Idem (dev)
$IPT -A INPUT -p tcp --sport 1973 -s XXX.XXX.XXX.XXX -d $ip -j ACCEPT
$IPT -A OUTPUT -p tcp --dport 1973 -d XXX.XXX.XXX.XXX -s $ip -j ACCEPT
done
#On accepte les connexion mysql depuis chez nous
$IPT -A INPUT -p tcp --dport mysql -s XXX.XXX.XXX.XXX -d ${SERVER_IP[0]} -j ACCEPT
$IPT -A OUTPUT -p tcp --sport mysql -d XXX.XXX.XXX.XXX -s ${SERVER_IP[0]} -j ACCEPT
#Ouverture pour le protocole d'Apple pour les notifcations
$IPT -A INPUT -p tcp --dport 2195 -j ACCEPT
$IPT -A OUTPUT -p tcp --dport 2195 -j ACCEPT
$IPT -A INPUT -p tcp --sport 2195 -j ACCEPT
$IPT -A OUTPUT -p tcp --sport 2195 -j ACCEPT
# Pas de log pour le scanner embetant...
$IPT -A INPUT -p udp -i ${PUB_IF} --sport 17500 --dport 17500 -j REJECT
$IPT -A INPUT -p udp -i ${PUB_IF} --sport 68 --dport 67 -j REJECT
##### Add your rules below ######
##### END your rules ############
# Do not log smb/windows sharing packets - too much logging
$IPT -A INPUT -p tcp -i eth0 --dport 137:139 -j REJECT
$IPT -A INPUT -p udp -i eth0 --dport 137:139 -j REJECT
# log everything else and drop
$IPT -A INPUT -j LOG --log-prefix "END INPUT "
$IPT -A FORWARD -j LOG
$IPT -A INPUT -j DROP
if [ $FAIL2BANACTIVATION -eq 1 ];
then
# Restarting fail2ban
/etc/init.d/fail2ban restart
fi
exit 0 |
