Bash Script For SSH Country Based Deny

sshfilter.sh

#!/bin/bash

# country codes to ACCEPT
ALLOW_COUNTRIES="US UK FR"

if [ $# -ne 1 ]; then
  echo "Usage:  `basename $0` <ip>" 1>&2
  exit 0 # return true in case of config issue
fi

COUNTRY=`/usr/bin/geoiplookup $1 | awk -F ": " '{ print $2 }' | awk -F "," '{ print $1 }' | head -n 1`

[[ $COUNTRY = "IP Address not found" || $ALLOW_COUNTRIES =~ $COUNTRY ]] && RESPONSE="ALLOW" || RESPONSE="DENY"

if [ $RESPONSE = "ALLOW" ]
then
  exit 0
else
  logger "$RESPONSE sshd connection from $1 ($COUNTRY)"
  exit 1
fi