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Update blocklist-update.sh
Update from LEXO blog with minor changes
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Alfonso
GitHub
parent
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commit
652f1de07a
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#!/bin/bash
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##
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## Configuration
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##
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# Files which should be downloaded
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TO_DOWNLOAD[0]="http://lists.blocklist.de/lists/ftp.txt"
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#TO_DOWNLOAD[1]="http://lists.blocklist.de/lists/bots.txt"
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#TO_DOWNLOAD[2]="http://lists.blocklist.de/lists/ssh.txt"
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TO_DOWNLOAD[1]="http://lists.blocklist.de/lists/bruteforcelogin.txt"
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TO_DOWNLOAD[2]="http://lists.blocklist.de/lists/apache.txt"
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# The download path to the file which contains all the IP addresses
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TO_DOWNLOAD="https://lists.blocklist.de/lists/all.txt"
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# Other settings; Edit if necesarry
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CHAINNAME="blocklist-de"
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ACTION="REJECT" # Can be DROP
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PRINT_REPORT=1
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ACTION="DROP" # Can be DROP or REJECT
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IPTABLES_PATH="/sbin/iptables"
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IPSET_PATH="/sbin/ipset"
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SORT_PATH="/usr/bin/sort"
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MAIL_PATH="/usr/bin/mail"
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GREP_PATH="/bin/grep"
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########## Do not edit anything below this line ##########
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if [ -z $IPTABLES_PATH ]; then echo "Cannot find [ iptables ]. Is it installed? Exiting"; exit 1; fi;
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if [ -z $IPSET_PATH ]; then echo "Cannot find [ ipset ]. Is it installed? Exiting"; exit 1; fi;
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if [ -z $SORT_PATH ]; then echo "Cannot find [ sort ]. Is it installed? Exiting"; exit 1; fi;
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if [ -z $MAIL_PATH ]; then echo "Cannot find [ mail ]. Is it installed? Exiting"; exit 1; fi;
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if [ -z $GREP_PATH ]; then echo "Cannot find [ grep ]. Is it installed? Exiting"; exit 1; fi;
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#
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## Needed variables
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#
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started=`date`
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version="1.0.0"
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amountDownloaded=0
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amountAfterSortAndUnique=0
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amountInserted=0
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amountDeleted=-1
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# E-Mail variables
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MAILLOG="/var/log/blocklist-update.log"
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MAIL_SENDER="backupinfo" #this defines a system-user without a shell or password. It's used as the e-mail sender name. You can create one like this: useradd -M -N -s /usr/sbin/nologin myuser && passwd -d myuser
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MAIL_SUBJECT="ERROR - IP blocklist script failed to download the IP set"
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MAIL_RECIPIENTS="mail-recipient@yourdomain.tld" #send mail to multiple receipients by overgiving a space-seperated address list
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fileUnfiltered="/tmp/blocklist-ips-unfiltered.txt"
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fileFiltered="/tmp/blocklist-ips-filtered.txt"
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BLOCKLIST_FILE="/tmp/ip-blocklist.txt"
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BLOCKLIST_TMP_FILE="/tmp/ip-blocklist.txt.tmp"
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#
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## Download every file and concat to one file
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#
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for currentFile in "${TO_DOWNLOAD[@]}"
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do
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wget -qO - $currentFile >> $fileUnfiltered
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done
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# Create a new MAILLOG from scratch. Do it the very simplest way possible
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rm -f $MAILLOG
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touch $MAILLOG
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#
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## Sort and filter
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#
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cat $fileUnfiltered | sort | uniq > $fileFiltered
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echo "" >>$MAILLOG
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echo "Downloading the most recent IP list from $TO_DOWNLOAD ..." >>$MAILLOG
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wgetOK=$(wget -qO - $TO_DOWNLOAD >> $BLOCKLIST_FILE) >>$MAILLOG 2>&1
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if [ $? -ne 0 ]; then
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echo "Most recent IP blocklist could not be downloaded from $TO_DOWNLOAD" >>$MAILLOG
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echo "Please check manually. The script calling this function: $0" >>$MAILLOG
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echo "You can download and import the IP list manually like this:" >>$MAILLOG
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echo "wget -qO - $TO_DOWNLOAD >> /tmp/blocklist-de.txt"
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echo "for i in $( cat /tmp/blocklist-de.txt ); do ipset add $CHAINNAME $i; done" >>$MAILLOG
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amountDownloaded=`cat $fileUnfiltered | wc -l`
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amountAfterSortAndUnique=`cat $fileFiltered | wc -l`
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### Sending warning e-mail and cancelling the update process
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sudo -u $MAIL_SENDER /usr/bin/mail -s "$MAIL_SUBJECT" $MAIL_RECIPIENTS < $MAILLOG
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#
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## Create chain if it does not exist
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#
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$IPTABLES_PATH --new-chain $CHAINNAME >/dev/null 2>&1
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### Exit with error in this case
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exit 1
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fi
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# Insert rule (if necesarry) into INPUT chain so the chain above will also be used
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echo "" >>$MAILLOG
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echo "Parsing the downloaded file and filter out only IPv4 addresses ..." >>$MAILLOG
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grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" $BLOCKLIST_FILE > $BLOCKLIST_TMP_FILE
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echo "" >>$MAILLOG
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echo "Removing duplicate IPs from the list ..." >>$MAILLOG
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sort -u $BLOCKLIST_TMP_FILE -o $BLOCKLIST_FILE >>$MAILLOG 2>&1
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rm $BLOCKLIST_TMP_FILE
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echo "" >>$MAILLOG
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echo "Setting up the ipset configuration by creating the '$CHAINNAME' IP set ..." >>$MAILLOG
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if [ `$IPSET_PATH list | grep "Name: $CHAINNAME" | wc -l` -eq 0 ]
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then
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# Create the new ipset set
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$IPSET_PATH create $CHAINNAME hash:ip maxelem 16777216 >>$MAILLOG 2>&1
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else
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echo "ipset configuration already exists - Flushing and recreating the iptables/ipset configuration ..." >>$MAILLOG
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# Reason: The kernel sometimes did not properly flush the ipset list which caused errors. Thus we remove the whole list and recreate it from scatch
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$IPTABLES_PATH --flush $CHAINNAME >>$MAILLOG 2>&1
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$IPSET_PATH flush $CHAINNAME >>$MAILLOG 2>&1
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$IPSET_PATH destroy $CHAINNAME >>$MAILLOG 2>&1
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$IPSET_PATH create $CHAINNAME hash:ip maxelem 16777216 >>$MAILLOG 2>&1
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fi
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echo "" >>$MAILLOG
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echo "Setting up the $CHAINNAME chain on iptables, if required..." >>$MAILLOG
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if [ `$IPTABLES_PATH -L -n | grep "Chain $CHAINNAME" | wc -l` -eq 0 ]
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then
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# Create the iptables chain
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$IPTABLES_PATH --new-chain $CHAINNAME >>$MAILLOG 2>&1
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fi
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echo "" >>$MAILLOG
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echo "Inserting the new chain $CHAINNAME into iptables INPUT, if required" >>$MAILLOG
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# Insert rule (if necesarry) into the INPUT chain so the chain above will also be used
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if [ `$IPTABLES_PATH -L INPUT | grep $CHAINNAME | wc -l` -eq 0 ]
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then
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# Insert rule because it is not present
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$IPTABLES_PATH -I INPUT -j $CHAINNAME
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# Insert rule because it is not present
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$IPTABLES_PATH -I INPUT -j $CHAINNAME >>$MAILLOG 2>&1
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fi
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#
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## Insert all IPs from the downloaded list if there is no rule stored
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#
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while read currentIP
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do
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# Check via command
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$IPTABLES_PATH -C $CHAINNAME -s $currentIP -j $ACTION >/dev/null 2>&1
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# Now we have to check the exit code of iptables via $?
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#
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# 0 = rule exists and don't has to be stored again
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# 1 = rule does not exist and has to be stored
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if [ $? -eq 1 ]
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then
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# Append the IP
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$IPTABLES_PATH -A $CHAINNAME -s $currentIP -j $ACTION >/dev/null 2>&1
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# Increment the counter
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amountInserted=$((amountInserted + 1))
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fi
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done < $fileFiltered
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## Now we delete the IPs which are stored in iptables but not anymore in the list
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while read currentIP
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do
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# Check if the ip is in the downloaded list
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if [ `cat $fileFiltered | grep $currentIP | wc -l` -eq 0 ]
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then
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# Delete the rule by its rulenumber
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# Because changing the action would result in errors
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$IPTABLES_PATH -D $CHAINNAME -s $currentIP -j $ACTION >/dev/null 2>&1
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# Increment the counter
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amountDeleted=$((amountDeleted + 1))
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fi
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done <<< "`$IPTABLES_PATH -n -L blocklist-de | awk '{print $4}'`"
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## Print report
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if [ $PRINT_REPORT -eq 1 ]
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# Create rule (if necesarry) into the $CHAINNAME
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echo "" >>$MAILLOG
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echo "Creating the firewall rule, if required..." >>$MAILLOG
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if [ `$IPTABLES_PATH -L $CHAINNAME | grep REJECT | wc -l` -eq 0 ]
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then
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echo "--- Blockliste.de :: Update-Report"
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echo ""
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echo "Script Version: $version"
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echo "Started: $started"
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echo "Finished: `date`"
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echo ""
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echo "--> Downloaded IPs: $amountDownloaded"
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echo "--> Unique IPs: $amountAfterSortAndUnique"
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echo "--> Inserted: $amountInserted"
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echo "--> Deleted: $amountDeleted"
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# Create the one and only firewall rule
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$IPTABLES_PATH -I $CHAINNAME -m set --match-set $CHAINNAME src -j $ACTION >>$MAILLOG 2>&1
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fi
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#
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## Cleanup
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#
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rm -f /tmp/blocklist-ips-unfiltered.txt
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rm -f /tmp/blocklist-ips-filtered.txt
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## Read all IPs from the downloaded IP list and fill up the ipset filter set
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echo "" >>$MAILLOG
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echo "Importing the IP list into the IP set..." >>$MAILLOG
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for i in $( cat $BLOCKLIST_FILE ); do $IPSET_PATH add $CHAINNAME $i >>$MAILLOG 2>&1; done
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echo "" >>$MAILLOG
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echo "Done." >>$MAILLOG
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sudo -u $MAIL_SENDER $MAIL_PATH -s "SUCCESS - IP blocklist script has updated the IP set with the newest IP list" $MAIL_RECIPIENTS < $MAILLOG
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