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#!/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 $MAX_TLD | wc -c) -eq 0 ];then
        #       MAX_TLD=18
        #fi
        # search for correction egrep "([a-zA-Z0-9_-.]+\.){1,2}[a-zA-Z]{2,$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
                                        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