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#!/bin/sh
# Open Infrastructure: service-tools
# Copyright (C) 2014-2022 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
set -e
HOOK="$(basename "${0}")"
HOOK_ACTION="$(echo "${HOOK}" | awk -F. '{ print $1 }')"
# set nsupdate action
case "${HOOK}" in
clean_challenge.*)
HOOK_ACTION="delete"
;;
deploy_challenge.*)
HOOK_ACTION="add"
;;
*)
echo "'${HOOK}': no such hook action '${HOOK_ACTION}'" >&2
echo "'${HOOK}': use 'clean_challenge.' or 'deploy_challenge.' as prefix in your symlink" >&2
exit 1
;;
esac
# alternatives handling for dig
if command -v kdig > /dev/null 2>&1
then
# knot-dnsutils
DIG_VARIANT="knot"
elif command -v dig > /dev/null 2>&1
then
# bind-dnsutils
DIG_VARIANT="bind"
else
echo "'${HOOK}': need dig from bind-dnsutils or knot-dnsutils" >&2
exit 1
fi
case "${DIG_VARIANT}" in
knot)
DIG="kdig +noidn"
;;
bind)
DIG="dig +noidnout"
;;
esac
# alternatives handling for nsupdate
if command -v knsupdate > /dev/null 2>&1
then
# knot-dnsutils
NSUPDATE_VARIANT="knot"
elif command -v nsupdate > /dev/null 2>&1
then
# bind-dnsutils
NSUPDATE_VARIANT="bind"
else
echo "'${HOOK}': need nsupdate from bind-dnsutils or knot-dnsutils" >&2
exit 1
fi
case "${NSUPDATE_VARIANT}" in
knot)
NSUPDATE="knsupdate"
;;
bind)
NSUPDATE="nsupdate"
;;
esac
# config
for FILE in /etc/default/dehydrated-nsupdate /etc/default/dehydrated-nsupdate.d/*
do
if [ -e "${FILE}" ]
then
. "${FILE}"
fi
done
# find txt record to update
CNAME="$(${DIG} +nocomments +noquestion "_acme-challenge.${DOMAIN}" 2>&1 | grep -v '^;' | awk '/CNAME/ { print $5 }' | tail -n1)"
if [ -n "${CNAME}" ]
then
TXT_RECORD="${CNAME}"
else
TXT_RECORD="_acme-challenge.${DOMAIN}"
fi
ZONE="${TXT_RECORD}"
# find all nameservers to update
while true
do
NAMESERVERS="$(${DIG} +nocomments +noquestion NS "${ZONE}" 2>&1 | grep -v '^;' | awk '/NS/ { print $5 }')"
if [ -n "${NAMESERVERS}" ]
then
ZONE="$(${DIG} +nocomments +noquestion NS "${ZONE}" 2>&1 | grep -v '^;' | awk '/NS/ { print $1 }' | tail -n1)"
break
else
ZONE="$(echo "${ZONE}" | cut -d '.' -f 2-)"
fi
done
NAMESERVERS_IPV6=""
NAMESERVERS_IPV4=""
for NAMESERVER in ${NAMESERVERS}
do
if [ -n "$(${DIG} +nocomments +noquestion +short AAAA "${NAMESERVER}")" ]
then
NAMESERVERS_IPV6="${NAMESERVERS_IPV6} ${NAMESERVER}"
fi
if [ -n "$(${DIG} +nocomments +noquestion +short A "${NAMESERVER}")" ]
then
NAMESERVERS_IPV4="${NAMESERVERS_IPV4} ${NAMESERVER}"
fi
done
# filter nameservers by available IP protocol
NAMESERVERS=""
if hostname -I | grep -qs ':'
then
NAMESERVERS="${NAMESERVERS} ${NAMESERVERS_IPV6}"
fi
if hostname -I | grep -qs '\.'
then
NAMESERVERS="${NAMESERVERS} ${NAMESERVERS_IPV4}"
fi
NAMESERVERS="$(echo "${NAMESERVERS}" | sed -e 's| |\n|g' | sort -u -V)"
# update nameservers
for NAMESERVER in ${NAMESERVERS}
do
if [ -e "/etc/dehydrated/tsig/$(basename "${TXT_RECORD}" .).key" ]
then
# specific key per record
KEY="/etc/dehydrated/tsig/$(basename "${TXT_RECORD}" .).key"
elif [ -e "/etc/dehydrated/tsig/$(basename "${ZONE}" .).key" ]
then
# specific key per zone
KEY="/etc/dehydrated/tsig/$(basename "${ZONE}" .).key"
elif [ -e "/etc/dehydrated/tsig/$(basename "${NAMESERVER}" .).key" ]
then
# specific key per nameserver
KEY="/etc/dehydrated/tsig/$(basename "${NAMESERVER}" .).key"
elif [ -e "/etc/dehydrated/tsig.key" ]
then
# global key (filesystem)
KEY="/etc/dehydrated/tsig.key"
elif [ -n "${TSIG_KEYFILE}" ] && [ -e "${TSIG_KEYFILE}" ]
then
# global key (conffile)
KEY="${TSIG_KEYFILE}"
else
# no key
KEY=""
fi
# ignoring comments to allow empty keyfiles to disable TSIG individually
TSIG="$(grep -sv '^#' "${KEY}" || true)"
if [ -n "${KEY}" ] && [ -n "${TSIG}" ]
then
case "${NSUPDATE_VARIANT}" in
knot)
NSUPDATE_OPTIONS="-k ${KEY}"
;;
bind)
NSUPDATE_OPTIONS="-y $(cat "${KEY}")"
;;
esac
fi
echo -n " + sending '${HOOK_ACTION}' for ${TXT_RECORD} to ${NAMESERVER}.."
# shellcheck disable=SC2086
echo "server ${NAMESERVER}
zone ${ZONE}
ttl 0
update ${HOOK_ACTION} ${TXT_RECORD} 0 TXT ${TOKEN_VALUE}
send" | "${NSUPDATE}" ${NSUPDATE_OPTIONS}
echo " done."
done
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