1 files changed, 212 insertions, 0 deletions
diff --git a/dehydrated/bin/dehydrated-nsupdate b/dehydrated/bin/dehydrated-nsupdate
new file mode 100755
index 0000000..c6bf6c5
--- /dev/null
+++ b/dehydrated/bin/dehydrated-nsupdate
@@ -0,0 +1,212 @@
+#!/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