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How can I use Enterprise Security blocklists with Squid?

Splunk Employee
Splunk Employee

I've got some dynamically gathered blocklist information in Splunk App for Enterprise Security... and I want to put those lists into my Squid configuration.

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Re: How can I use Enterprise Security blocklists with Squid?

Splunk Employee
Splunk Employee

There are lots of tools to enable blocklist gathering in Squid, but since we've already gathered the data, why not just use the stuff that's already here? I use this script on my home server. That destination path is a little funny because I use SquidMan to manage my configuration.

squid.conf change:

acl blocklistIP src "Users/coates/Library/Preferences/squid_blocklist.txt"
http_access deny blocklistIP

shell script (runs via cron):

#!/bin/sh

if [ ! -z "$SPLUNK_HOME" ]
    then if [ -e "/Applications/splunk/" ] 
        then export SPLUNK_HOME=/Applications/splunk
    elif [ -e "/opt/splunk" ]
        then export SPLUNK_HOME=/Applications/splunk
    else
        echo "Please set \$SPLUNK_HOME"
    fi
fi

SRC=$SPLUNK_HOME/etc/apps/SA-ThreatIntelligence/lookups
DEST=$HOME/Library/Preferences/squid_blocklist.txt

rm -rf $DEST

# Ranges
cat $SRC/ip_piratebaylist.csv | awk 'BEGIN {FS=","} {print $1"/32"}' | tr -d '"' | grep -v [:numeric] >> $DEST
cat $SRC/ip_rapidsharelist.csv | awk 'BEGIN {FS=","} {print $1"/32"}' | tr -d '"' | grep -v [:numeric] >> $DEST
cat $SRC/sans_blocklist.csv | awk 'BEGIN {FS=","} {print $1"/32"}' | tr -d '"' | grep -v [:numeric] >> $DEST

# Solo addresses
cat $SRC/ip_proxylist.csv | awk 'BEGIN {FS=","} {print $1}' | awk 'BEGIN {FS="-"} {print $1"/32"}' | tr -d '"'  | grep -v [:numeric] >> $DEST
cat $SRC/ip_spywarelist.csv | awk 'BEGIN {FS=","} {print $1}' | awk 'BEGIN {FS="-"} {print $1"/32"}' | tr -d '"'  | grep -v [:numeric] >> $DEST
cat $SRC/ip_torlist.csv | awk 'BEGIN {FS=","} {print $1}' | awk 'BEGIN {FS="-"} {print $1"/32"}' | tr -d '"'  | grep -v [:numeric] >> $DEST
cat $SRC/ip_webattackerlist.csv | awk 'BEGIN {FS=","} {print $1}' | awk 'BEGIN {FS="-"} {print $1"/32"}' | tr -d '"'  | grep -v [:numeric] >> $DEST

sort $DEST | uniq > $DEST.tmp

cat $DEST.tmp | grep - | awk 'BEGIN {FS="."} {print $1"."$2"."$3}' > /tmp/badnets.txt
while read line; do grep -v $line $DEST.tmp |grep -v -; done < /tmp/badnets.txt > $DEST.tmp2

sort $DEST.tmp2 | uniq > $DEST

rm $DEST.tmp
rm $DEST.tmp2
rm /tmp/badnets.txt

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