#!/bin/bash

trap "pkill -HUP -g 0" INT

# change this to your specific ID
ID=79

echo -n "Press key then enter ctrl-d: " > /dev/stderr

otp=`tr -c -d a-z < /dev/tty`

#Verifying that this is MY yubikey, not just some random one.
if echo $otp | grep staticpartofkey > /dev/null
then
echo Greetings
else
#Failed test
echo Intruders are not permitted, Begone with you > /dev/stderr
pkill -HUP -g 0
exit 3
fi

#Check the Yubi
if wget -O - "https://api.yubico.com/wsapi/verify?id=$ID&otp=$otp" 2> /dev/null | grep status=OK > /dev/null
then
echo Yubikey ok > /dev/stderr
exec /bin/bash
fi

#Failed test
echo bad Yubikey > /dev/stderr
pkill -HUP -g 0
exit 3