#!/bin/sh
 
# denyhosts-remove.sh
#
# AUTHOR: Tommy Butler, email: $ echo YWNlQHRvbW15YnV0bGVyLm1lCg==|base64 -d
# VERSION: 1.0
#
# SUMMARY:
# Use this script to Remove an IP address ban that has been errantly blacklisted
# by denyhosts - the ubiquitous and unforgiving brute-force attack protection
# service so often used on linux boxen.
#
# *Unlike the ruby equivalent somewhere out there on the net, this script
# actually works.
#
# INSTALL:
# Usage: Put this script somewhere in your $PATH, and execute it as root or
# with sudo.  Call it directly or with an IP address argument.  Multiple IP
# address arguments are not supported.  You'll need to `chmod +x` it first.
#
# LICENSE:
# GNU GPL 1.0
# Copyright 2009 Tommy Butler, All rights reserved
 
BASE_PATH="/var/lib/denyhosts";
IP=$1
 
if [[ "`/usr/bin/id -u`" != "0" ]]; then
	echo "Run this script as root or with sudo or app can't run correctly.  Aborted."
	exit 1;
fi
 
cd $BASE_PATH
 
if [[ "`pwd`" != "$BASE_PATH" ]]; then
	echo "Couldn't cd to $BASE_PATH.  Abort."
	exit 1;
fi
 
if [[ "$IP" == "" ]]; then
	echo "Enter the IP address you want to un-ban"
	read IP
fi
 
if [[ "$IP" == "" ]]; then
	echo "No IP address given.  Abort."
	exit 1;
fi
 
/etc/init.d/denyhosts stop
 
/usr/bin/perl -pi -e "s/^.*?$IP.*\n//g" /etc/hosts.deny *
 
/etc/init.d/denyhosts start
 
exit $?