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#!/bin/bash
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# $Id: alcasar-bl.sh 2688 2019-01-18 23:15:49Z lucas.echard $
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# alcasar-autoupdate.sh
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# by Sven RATH and Rexy
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# This script is distributed under the Gnu General Public License (GPL)
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# Gestion de la BL pour le filtrage de domaine (via unbound) et d'URL (via E2guardian)
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# Manage the BL for DnsBlackHole (unbound) and URL filtering (E2guardian)
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FILE_tmp="/tmp/filesfilter.txt"
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FILE_ip_tmp="/tmp/filesipfilter.txt"
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DIR_DG="/etc/e2guardian/lists"
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DIR_DG_BL="$DIR_DG/blacklists"
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DIR_SHARE="/usr/local/share"
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DIR_DNS_BL="$DIR_SHARE/unbound-bl"					# all the BL in the Unbound format
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DIR_DNS_WL="$DIR_SHARE/unbound-wl"					# all the WL	'	'	'
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DIR_IP_BL="$DIR_SHARE/iptables-bl"					# all the IP addresses of the BL
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DIR_IP_WL="$DIR_SHARE/iptables-wl"					# IP ossi disabled WL
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CNC_BL_NAME="ossi-bl-candc"
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CNC_URL="https://osint.bambenekconsulting.com/feeds/"
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CNC_DNS=${CNC_URL}c2-dommasterlist-high.txt
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CNC_IP=${CNC_URL}c2-ipmasterlist-high.txt
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SED="/bin/sed -i"
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CURL="/usr/bin/curl"
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# cleaning file and split it ("domains" in $FILE_tmp & "IP" in $FILE_ip_tmp)
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function clean_split (){
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	$SED '/^#.*/d' $FILE_tmp # remove commented lines
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	$SED '/^\s*$/d' $FILE_tmp # remove empty lines
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	$SED '/[äâëêïîöôüû@,]/d' $FILE_tmp # remove line with "chelou" characters
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	# extract ip addresses for iptables.
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	awk '/^([0-9]{1,3}\.){3}[0-9]{1,3}$/{print "add bl_ip_blocked " $0}' $FILE_tmp > $FILE_ip_tmp
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	# extract domain names for unbound.
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	$SED -n '/^\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}/!p' $FILE_tmp
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	# Retrieve max Top Level Domain for domain name synthax
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	#MAX_TLD=$(curl http://data.iana.org/TLD/tlds-alpha-by-domain.txt | grep -v '-' | grep -v '#' | wc -L)
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	#if [ $(echo $MAX_TLD | wc -c) -eq 0 ];then
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	#	MAX_TLD=18
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	#fi
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	# search for correction	egrep "([a-zA-Z0-9_-.]+\.){1,2}[a-zA-Z]{2,$MAX_TLD}" $ossi_custom_dir/domains > $FILE_tmp
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}
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usage="Usage: alcasar-bl-autoupdate.sh { -update_cat or --update_cat | -update_ossi-bl-candc or --update_ossi-bl-candc }"
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nb_args=$#
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args=$1
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if [ $nb_args -eq 0 ]
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then
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	args="-h"
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fi
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case $args in
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	-\? | -h* | --h*)
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		echo "$usage"
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		exit 0
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		;;
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	# Update the categories of Toulouse BL listed in "/usr/local/etc/update_cat.conf" (via rsync). Cron runs this function every 12h
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	-update_cat | --update_cat)
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		if [ $(cat /usr/local/etc/update_cat.conf | wc -l) -ne 0 ]
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		then
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			echo -n "Updating categories in /usr/local/etc/update_cat.conf ..."
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			cat /usr/local/etc/update_cat.conf | while read LIGNE_RSYNC
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			do
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				CATEGORIE=$(echo $LIGNE_RSYNC | cut -d' ' -f1)
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				URL=$(echo $LIGNE_RSYNC | cut -d' ' -f2)
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				PATH_FILE=$(find $DIR_DG_BL/ -type d -name $CATEGORIE) # retrieve directory name of the category
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				rsync -rv $URL $(dirname $PATH_FILE ) #rsync inside of the blacklist directory
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				# Creation of unbound and Iptables BL and WL
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				DOMAIN=$(basename $PATH_FILE)
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				cp $PATH_FILE/domains $FILE_tmp
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				clean_split  # clean ossi custom files & split them for unbound and for iptables
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				black=`grep black $PATH_FILE/usage |wc -l`
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				if [ $black == "1" ]
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				then
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					# adapt to the unbound syntax for the blacklist
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					$SED "s?.*?local-zone: & typetransparent\nlocal-zone-tag: & blacklist?g" $FILE_tmp
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					mv $FILE_tmp $DIR_DNS_BL/$DOMAIN.conf
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					mv $FILE_ip_tmp $DIR_IP_BL/$DOMAIN
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				else
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					# adapt to the unbound syntax for the whitelist
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					$SED "s?.*?local-zone: & transparent?g" $FILE_tmp
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					$SED "p; s? transparent? ipset?g" $FILE_tmp # duplicate lines to enable ipset module
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					mv $FILE_tmp $DIR_DNS_WL/$DOMAIN.conf
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					mv $FILE_ip_tmp $DIR_IP_WL/$DOMAIN
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				fi
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				rm -f $FILE_tmp $FILE_ip_tmp
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			done
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			/usr/local/bin/alcasar-bl.sh --reload
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		else
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			echo -n "/usr/local/etc/update_cat.conf is empty ..."
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		fi
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		echo
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		;;
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	# Update C&C-Server Blacklist (TODO : check that there is a difference between two downloads)
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	-update_ossi-bl-candc | --update_ossi-bl-candc)
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		# check availability of the lists
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        echo "Downloading blacklists from ${CNC_URL}..."
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        STATUS_DNS_BL=$(${CURL} --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${CNC_DNS})
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        STATUS_IP_BL=$(${CURL} --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${CNC_IP})
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        # if downloaded successfully
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        if [ $STATUS_DNS_BL = 200 ] && [ $STATUS_IP_BL = 200 ]; then
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            ## parse domain names and ips from feed (cut first 19 lines (comments) and extract first column)
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            CNC_DOMAINS=$($CURL $CNC_DNS | tail -n +19 | awk -F, '{print $1}')
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            CNC_IPS=$($CURL $CNC_IP | tail -n +19 | awk -F, '{print $1}')
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            ## create files and adapt downloaded data to alcasar structure (add newlines after each ip/domain)
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            BL_DIR=${DIR_DG_BL}/${CNC_BL_NAME}
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            rm -rf ${BL_DIR}
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            mkdir $BL_DIR
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            echo $CNC_DOMAINS | tr " " "\n" > ${BL_DIR}/urls
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            echo $CNC_IPS | tr " " "\n" > ${BL_DIR}/domains
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            ## reload ossi-blacklists to add the created blacklist to ALCASAR
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            echo "Download successfull."
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            /usr/local/bin/alcasar-bl.sh --reload
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            exit 0
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        # if server responded with a code different than 200
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        else
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            ## 000 means that curl failed
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            if [ $STATUS_DNS_BL = 000 ] || [ $STATUS_IP_BL = 000 ]; then
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                echo "ERROR: curl could not access the internet to download blacklists."
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                echo "This appears to be an error on your side: please check the connection to the internet."
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            else
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                echo "ERROR: could not donwload blacklists: Server returned non-200 codes:"
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                echo "${CNC_DNS} returned ${STATUS_DNS_BL}"
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                echo "${CNC_IP} returned ${STATUS_IP_BL}"
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                echo "Check the availability of the sites. Maybe the server removed its content or changed its address."            
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            fi
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	        exit 1
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        fi
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    	;;
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esac