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December 11, 2021 23:37
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Bash script that uses ipset and iptables to block countries
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#! /bin/bash | |
# blockbygeo.sh - Download country ipsets & add to iptables firewall rules | |
# By: Sophie Forceno | |
# | |
# Depends on: wget, ipset, iptables | |
IFS=$'\n' | |
action="$1" | |
country="$2" | |
# To add a country: | |
# Append country code to end of this array | |
# run 'sudo ./blockbygeo.sh add xx' where xx | |
# where xx is the country code you appended to ${COUNTRY[@]} | |
COUNTRY=( "cn" "ru" ) | |
add_country() { | |
# Adds rule and creates ipset for a country added to ${COUNTRY[@]} | |
echo "Creating new ipset..." | |
sudo ipset -N "$country" hash:net | |
echo "Adding new firewall rule..." | |
iptables -v -I INPUT -m set --match-set "$country" src -j DROP | |
if [ ! -e /etc/blockbygeo/zones/ ]; then | |
echo "Creating zones/ directory..." | |
mkdir /etc/blockbygeo/zones | |
fi | |
echo "Downloading ipset..." | |
sudo wget --quiet -P . http://www.ipdeny.com/ipblocks/data/countries/"$country".zone -O /etc/blockbygeo/zones/"$country".zone | |
echo "Adding IPs from zone file to ipset..." | |
zonefile=( $(sudo cat /etc/blockbygeo/zones/"$country".zone) ) | |
for i in "${zonefile[@]}"; do | |
sudo ipset -A "$country" "$i" -exist | |
done | |
echo "Done. Don't forget to add country to country code array in blockbygeo.sh" | |
} | |
update_ipsets() { | |
echo "Removing old zone files..." | |
sudo rm -f /etc/blockbygeo/zones/*.zone | |
echo "Flushing existing IPsets..." | |
sudo ipset flush | |
dl_ipsets | |
add_ipsets | |
} | |
add_rules() { | |
# Adds firewall rules for each of the new IPsets | |
echo "Adding ipset iptables firewall rules..." | |
for x in ${COUNTRY[@]}; do | |
echo "Adding rule for ipset: $x" | |
iptables -v -I INPUT -m set --match-set "$x" src -j DROP | |
done | |
} | |
make_ipsets() { | |
# Create IPsets for each country code in array | |
for x in ${COUNTRY[@]}; do | |
echo "Creating ipset: $x" | |
sudo ipset -N "$x" hash:net | |
done | |
} | |
dl_ipsets() { | |
# Pull the latest IP set for countries | |
echo "Downloading latest IP sets for countries..." | |
if [ ! -e /etc/blockbygeo/zones ]; then | |
mkdir /etc/blockbygeo/zones | |
fi | |
ping -w 10 -c 3 ipdeny.com > /dev/null | |
rc=$? | |
# Verify there is an active internet connection | |
if [ $rc -eq 0 ]; then | |
# Confirm wget is installed before proceeding | |
for c in ${COUNTRY[@]}; do | |
echo "Downloading "$c".zone..." | |
sudo wget --quiet -P . http://www.ipdeny.com/ipblocks/data/countries/"$c".zone -O /etc/blockbygeo/zones/"$c".zone | |
done | |
else | |
echo "Can't reach ipdeny.com to download zone files. Check your internet connection." | |
fi | |
} | |
add_ipsets() { | |
# Add each IP address from the downloaded list into each ipset | |
echo "Adding IPs from downloaded zones into ipsets..." | |
for c in ${COUNTRY[@]}; do | |
echo "Adding IPs to ipset: $c" | |
zonefile=( $(sudo cat /etc/blockbygeo/zones/"$c".zone) ) | |
for i in "${zonefile[@]}"; do | |
sudo ipset -A "$c" "$i" -exist | |
done | |
done | |
} | |
## Main | |
main() { | |
# Create ipsets if they don't exist | |
if [ $(sudo ipset -L | head -c1 | wc -c) -eq 0 ]; then | |
make_ipsets | |
fi | |
# Only add iptables firewall rules on first run | |
if [ ! -e /etc/blockbygeo/.firstrun ]; then | |
add_rules | |
sudo touch /etc/blockbygeo/.firstrun | |
fi | |
# Remove old lists | |
echo "Removing old zone files..." | |
sudo rm -f /etc/blockbygeo/zones/*.zone | |
dl_ipsets | |
add_ipsets | |
} | |
# Make sure user is root | |
if [ "$EUID" -ne 0 ]; then | |
echo "Blockbygeo.sh must be run as root." | |
exit | |
fi | |
case "$1" in | |
add | -a) | |
add_country | |
;; | |
update | -u) | |
update_ipsets | |
;; | |
*) | |
main | |
;; | |
esac | |
exit 0 |
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Recommend running as a cron job on a weekly, or even daily, basis.