ACTION=="remove", ENV{ID_VENDOR}=="Yubico", RUN+="/usr/local/bin/ykgone"
ACTION=="add",      ENV{ID_VENDOR}=="Yubico", RUN+="/usr/local/bin/ykhere"

#!/bin/bash

if [ -n "$(lsusb | grep Yubikey)" ] ; then
    /bin/su coventry -c /usr/local/bin/unlock
fi

if [ "`~/bin/chalresp.py `" == "OK" ]; then
    pkill xscreensaver
fi

#!/usr/bin/python

import subprocess, os, re

recpath = os.path.expanduser('~/.ykchalresp')

chal, resp = open(recpath).read().strip().split()

def make_resp(chal):
    return subprocess.check_output(['ykchalresp', '-2', '-H', chal]
                                   ).strip()

tresp = make_resp(chal)

if tresp == resp:
    # Challenge succeeded; make a new challenge for next time
    nresp = make_resp(tresp)
    print >> open(recpath, 'w'), tresp, nresp
    print 'OK'
    exit(0)
else:
    print 'Failed'
    exit(1)

#!/bin/bash

function yubiwait() {
    while [ "`~/bin/chalresp.py 2> /dev/null`" != "OK" ] ; do sleep 0.05 ; done
    killall xscreensaver
}

( while [ /bin/true ] ; do xscreensaver-command -watch ; done ) \
    | while read a ; do
        echo $a | grep "^LOCK" && yubiwait
      done