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#!/bin/sh
function help() {
echo "usage: ${0} [OPTIONS]"
echo
echo "where OPTIONS are:"
echo " -1 use Yubico key slot 1"
echo " -2 use Yubico key slot 2 (default)"
echo " -h show this help"
}
DEVICE="$(egrep -v '^(#|$)' /etc/crypttab.initramfs 2>/dev/null | head -n1 | sed 's/\s\+/:/g' | cut -d: -f2)"
SERIAL="$(ykinfo -sq)"
SLOT="2"
TMPDIR="$(mktemp --directory --tmpdir=/tmp/ .$(basename ${0})-${$}-XXXXXX)"
while getopts "12h" opt; do
case ${opt} in
1)
SLOT="1"
;;
2)
SLOT="2"
;;
h)
help
exit 0
;;
esac
done
# check we have all information
if [ -z "${DEVICE}" ]; then
echo "Failed to get device from /etc/crypttab.initramfs." >&2
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}' is not a LUKS device." >&2
exit 1
elif [ -z "${SERIAL}" ]; then
echo "Did not get a serial number from key. Did you insert one?" >&2
exit 1
fi
# This directroy should exist, but we create it in case it does not
if [ ! -d "/etc/ykfde.d/" ]; then
install -d -m 0700 "/etc/ykfde.d/"
fi
# generate the challenge
if ! makepasswd --chars=64 | tr -d '\n' > "/etc/ykfde.d/challenge-${SERIAL}"; then
exit 1
fi
# generate response
if ! ykchalresp -${SLOT} "$(cat "/etc/ykfde.d/challenge-${SERIAL}")" | tr -d '\n' > "${TMPDIR}/ykfde-response"; then
# ykchalresp should have shouted, so do not complain here
exit 1
fi
# add key to LUKS device
if ! cryptsetup luksAddKey "${DEVICE}" "${TMPDIR}/ykfde-response"; then
# cryptsetup should have shouted, ...
exit 1
fi
# shred response and remove temporary directory
shred --remove "${TMPDIR}/ykfde-response"
rm -rf "${TMPDIR}"
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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