Unblock host from denyhosts

deldenyhosts

#!/bin/bash
# Description: Remove host from denyhosts files
# This script can be run from any directory
# It requires to be run as root
#
# Pablo Llopis 2011

CONFIG='/etc/denyhosts.conf'

if [ $# -ne 1 ];
then
        echo "Usage: $0 <host>"
        exit
fi

host=$1

# get denyhosts work dir location
prefix=$(cat ${CONFIG} | grep -v "^\s*#" | grep WORK_DIR | awk '{print $3}')

# get files which contain host to be removed 
match="${host}:"
offending_files=$(grep -H "${match}" ${prefix}/* | awk -F ':' '{print $1}')

# remove lines containing matching host pattern
for f in ${offending_files}
do
        tmpf="/tmp/$(basename $f)"
        grep -v "${match}" ${f} > ${tmpf}
        mv ${tmpf} ${f}
done

#remove from /etc/hosts.deny
#try to avoid race condition where unprivileged users
#would overwrite hosts.deny just before final move to /etc
touch /tmp/hosts.deny
chown root /tmp/hosts.deny
chmod 600 /tmp/hosts.deny
grep -v "sshd: ${host}\$" /etc/hosts.deny > /tmp/hosts.deny
mv /tmp/hosts.deny /etc/hosts.deny
chmod 644 /etc/hosts.deny