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#!/bin/sh
function help() {
echo "usage: ${0} [OPTIONS]"
echo
echo "where OPTIONS are:"
echo " -1 use Yubico key slot 1"
echo " -2 use Yubico key slot 2"
echo " -d DEVICE add key to device DEVICE"
echo " -h show this help"
echo " -k keep challenge, just add a new slot"
}
DIR="/tmp/.ykfde-${$}/"
PASS=""
SLOT="1"
KEEP="0"
while getopts "12d:hk" opt; do
case ${opt} in
1)
SLOT="1"
;;
2)
SLOT="2"
echo "Do not forget to add 'ykfde_slot=2' to your boot parameters!"
;;
d)
DEVICE="${OPTARG}"
;;
h)
help
exit 0
;;
k)
KEEP="1"
;;
esac
done
if [ -z "${DEVICE}" ]; then
echo "No device given." >&2
help
exit 1
elif [ ! -b "${DEVICE}" ]; then
echo "Device '${DEVICE}' does not exist or is not a block device." >&2
exit 1
elif ! cryptsetup isLuks "${DEVICE}" 2>/dev/null; then
echo "Device '${DEVICE}' does not exist." >&2
exit 1
fi
install -d -m0700 "${DIR}"
echo "Please give extra password if you want to activate two factor"
echo -n "authentication, just ENTER for none: "
stty -echo
read PASS
stty echo
echo
if [ -n "${PASS}" ]; then
echo "Do not forget to add 'ykfde_twofactor=y' to your boot parameters!"
fi
# generate challenge
if [ "${KEEP}" = "1" ] && [ -s "/etc/ykfde-challenge" ]; then
echo "User requested to keep challenge, not generating a new one."
ln -s "/etc/ykfde-challenge" "${DIR}/ykfde-challenge"
else
makepasswd --chars=$((64-${#PASS})) | tr -d '\n' > "${DIR}/ykfde-challenge"
fi
# generate response and add key to LUKS device
if ! ykchalresp -${SLOT} "${PASS}$(cat ${DIR}/ykfde-challenge)" > "${DIR}/ykfde-response"; then
# ykchalresp should have shouted, so do not complain here
exit 1
fi
if ! cryptsetup luksAddKey "${DEVICE}" "${DIR}/ykfde-response"; then
# cryptsetup should have shouted, ...
exit 1
fi
# shred response and install challenge
shred --remove "${DIR}/ykfde-response"
if [ "${KEEP}" != "1" ] && [ -s "${DIR}/ykfde-challenge" ] && [ ! -L "${DIR}/ykfde-challenge" ]; then
install -D -m 0400 "${DIR}/ykfde-challenge" "/etc/ykfde-challenge"
fi
rm -rf "${DIR}"
echo "Please do not forget to remove old keys when changing challenge!"
echo "Now run 'mkinitcpio' to build a new initramfs!"
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