Subversion Repositories ALCASAR

#!/bin/bash

# $Id: alcasar-bl.sh 2688 2019-01-18 23:15:49Z lucas.echard $

# alcasar-autoupdate.sh

# by Sven RATH and Rexy

# This script is distributed under the Gnu General Public License (GPL)

# Gestion de la BL pour le filtrage de domaine (via unbound) et d'URL (via E2guardian)

# Manage the BL for DnsBlackHole (unbound) and URL filtering (E2guardian)

FILE_tmp="/tmp/filesfilter.txt"

FILE_ip_tmp="/tmp/filesipfilter.txt"

DIR_DG="/etc/e2guardian/lists"

DIR_DG_BL="$DIR_DG/blacklists"

DIR_SHARE="/usr/local/share"

DIR_DNS_BL="$DIR_SHARE/unbound-bl"					# all the BL in the Unbound format

DIR_DNS_WL="$DIR_SHARE/unbound-wl"					# all the WL	'	'	'

DIR_IP_BL="$DIR_SHARE/iptables-bl"					# all the IP addresses of the BL

DIR_IP_WL="$DIR_SHARE/iptables-wl"					# IP ossi disabled WL

CNC_BL_NAME="ossi-bl-candc"

CNC_URL="https://osint.bambenekconsulting.com/feeds/"

CNC_DNS=${CNC_URL}c2-dommasterlist-high.txt

CNC_IP=${CNC_URL}c2-ipmasterlist-high.txt

SED="/bin/sed -i"

CURL="/usr/bin/curl"

# cleaning file and split it ("domains" in $FILE_tmp & "IP" in $FILE_ip_tmp)

function clean_split (){

	$SED '/^#.*/d' $FILE_tmp # remove commented lines

	$SED '/^\s*$/d' $FILE_tmp # remove empty lines

	$SED '/[äâëêïîöôüû@,]/d' $FILE_tmp # remove line with "chelou" characters

	# extract ip addresses for iptables.

	awk '/^([0-9]{1,3}\.){3}[0-9]{1,3}$/{print "add bl_ip_blocked " $0}' $FILE_tmp > $FILE_ip_tmp

	# extract domain names for unbound.

	$SED -n '/^\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}/!p' $FILE_tmp

	# Retrieve max Top Level Domain for domain name synthax

	#MAX_TLD=$(curl http://data.iana.org/TLD/tlds-alpha-by-domain.txt | grep -v '-' | grep -v '#' | wc -L)

	#if [ $(echo $MAX_TLD | wc -c) -eq 0 ];then

	#	MAX_TLD=18

	#fi

	# search for correction	grep -E "([a-zA-Z0-9_-.]+\.){1,2}[a-zA-Z]{2,$MAX_TLD}" $ossi_custom_dir/domains > $FILE_tmp

}

usage="Usage: alcasar-bl-autoupdate.sh { -update_cat or --update_cat | -update_ossi-bl-candc or --update_ossi-bl-candc }"

nb_args=$#

args=$1

if [ $nb_args -eq 0 ]

then

	args="-h"

fi

case $args in

	-\? | -h* | --h*)

		echo "$usage"

		exit 0

		;;

	# Update the categories of Toulouse BL listed in "/usr/local/etc/update_cat.conf" (via rsync). Cron runs this function every 12h

	-update_cat | --update_cat)

		if [ $(cat /usr/local/etc/update_cat.conf | wc -l) -ne 0 ]

		then

			echo -n "Updating categories in /usr/local/etc/update_cat.conf ..."

			cat /usr/local/etc/update_cat.conf | while read LIGNE_RSYNC

			do

				CATEGORIE=$(echo $LIGNE_RSYNC | cut -d' ' -f1)

				URL=$(echo $LIGNE_RSYNC | cut -d' ' -f2)

				PATH_FILE=$(find $DIR_DG_BL/ -type d -name $CATEGORIE) # retrieve directory name of the category

				rsync -rv $URL $(dirname $PATH_FILE ) #rsync inside of the blacklist directory

				# Creation of unbound and Iptables BL and WL

				DOMAIN=$(basename $PATH_FILE)

				cp $PATH_FILE/domains $FILE_tmp

				clean_split  # clean ossi custom files & split them for unbound and for iptables

				black=`grep black $PATH_FILE/usage |wc -l`

				if [ $black == "1" ]

				then

					# adapt to the unbound syntax for the blacklist

					$SED "s?.*?local-zone: & typetransparent\nlocal-zone-tag: & blacklist?g" $FILE_tmp

					mv $FILE_tmp $DIR_DNS_BL/$DOMAIN.conf

					mv $FILE_ip_tmp $DIR_IP_BL/$DOMAIN

				else

					# adapt to the unbound syntax for the whitelist

					$SED "s?.*?local-zone: & transparent?g" $FILE_tmp

					$SED "p; s? transparent? ipset?g" $FILE_tmp # duplicate lines to enable ipset module

					mv $FILE_tmp $DIR_DNS_WL/$DOMAIN.conf

					mv $FILE_ip_tmp $DIR_IP_WL/$DOMAIN

				fi

				rm -f $FILE_tmp $FILE_ip_tmp

			done

			/usr/local/bin/alcasar-bl.sh --reload

		else

			echo -n "/usr/local/etc/update_cat.conf is empty ..."

		fi

		echo

		;;

	# Update C&C-Server Blacklist (TODO : check that there is a difference between two downloads)

	-update_ossi-bl-candc | --update_ossi-bl-candc)

		# check availability of the lists

        echo "Downloading blacklists from ${CNC_URL}..."

        STATUS_DNS_BL=$(${CURL} --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${CNC_DNS})

        STATUS_IP_BL=$(${CURL} --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${CNC_IP})

        # if downloaded successfully

        if [ $STATUS_DNS_BL = 200 ] && [ $STATUS_IP_BL = 200 ]; then

            ## parse domain names and ips from feed (cut first 19 lines (comments) and extract first column)

            CNC_DOMAINS=$($CURL $CNC_DNS | tail -n +19 | awk -F, '{print $1}')

            CNC_IPS=$($CURL $CNC_IP | tail -n +19 | awk -F, '{print $1}')

            ## create files and adapt downloaded data to alcasar structure (add newlines after each ip/domain)

            BL_DIR=${DIR_DG_BL}/${CNC_BL_NAME}

            rm -rf ${BL_DIR}

            mkdir $BL_DIR

            echo $CNC_DOMAINS | tr " " "\n" > ${BL_DIR}/urls

            echo $CNC_IPS | tr " " "\n" > ${BL_DIR}/domains

            ## reload ossi-blacklists to add the created blacklist to ALCASAR

            echo "Download successfull."

            /usr/local/bin/alcasar-bl.sh --reload

            exit 0

        # if server responded with a code different than 200

        else

            ## 000 means that curl failed

            if [ $STATUS_DNS_BL = 000 ] || [ $STATUS_IP_BL = 000 ]; then

                echo "ERROR: curl could not access the internet to download blacklists."

                echo "This appears to be an error on your side: please check the connection to the internet."

            else

                echo "ERROR: could not donwload blacklists: Server returned non-200 codes:"

                echo "${CNC_DNS} returned ${STATUS_DNS_BL}"

                echo "${CNC_IP} returned ${STATUS_IP_BL}"

                echo "Check the availability of the sites. Maybe the server removed its content or changed its address."            

            fi

	        exit 1

        fi

    	;;

esac