공격 아이피 iptable 등록 스크립트.

mail log를 점검하다 보니, 지속적으로 접근시도하는 부분이 보인다.

보안장비를 사용하면 간단하게 막으련만... 여의치 않아 스크립트를 작성하였다.

#/bin/bash


help()
{
			echo ""
			echo "/var/log/maillog is default"
			echo "iptable apply is not default"
			echo "banCount 100 is default"
                        echo "-a : iptable applied"
                        echo "-f : maillog FILE PATH"
                        echo "-c : ban count"
                        echo ""
                        echo "Usae : $0 -a -c 100 -f /var/log/maillog "
                        exit 0
}

ignoreIPs=("111.222.333.444" "111.111.111.111")
maillog="/var/log/maillog"
banCount=100
fw=false

# 옵션이름 뒤에 :이 붙은 것은 값을 필요로 함을 의미합니다.
while getopts ac:f: opt
do
    case $opt in
        a)
	    fw=true
            ;;
        c)
	    banCount=$OPTARG
            ;;
        f)
            maillog=$OPTARG
            ;;
        *)
            help
            exit 0
            ;;
    esac
done


banIPs=`grep -E 'user not found|password fail' ${maillog}  | awk -F: '{print $NF}' | sort | uniq -dc | awk '{if ($1 > '"${banCount}"') print $NF}'`

for banIP in $banIPs
do
	for ignoreIP in ${ignoreIPs[@]}
	do
		if [ $ignoreIP == $banIP ]
		then
	#		echo "ignore IP: ${ignoreIP}"
	#		echo "ban IP : $banIP"
			break
		fi
	done

	echo "ban IP : $banIP ,whois : $(geoiplookup $banIP)"
	if [ $fw = true ] ; then
		iptables -A INPUT -s ${banIP}/24 -j DROP
	fi
	
done


if [ $fw = true ] ; then
	#remove duplicate iptables rules
	#http://www.krazyworks.com/remove-duplicate-iptables-rules/
	/sbin/service iptables save
	/sbin/iptables-save | awk '!x[$0]++' > /tmp/iptables.conf
	/sbin/iptables -F
	/sbin/iptables-restore < /tmp/iptables.conf
	/sbin/service iptables save
	/sbin/service iptables restart
	if [ -f /tmp/iptables.conf ] ; then /bin/rm -f /tmp/iptables.conf ; fi
fi