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-rwxr-xr-xdehydrated/bin/dehydrated-nsupdate212
1 files changed, 212 insertions, 0 deletions
diff --git a/dehydrated/bin/dehydrated-nsupdate b/dehydrated/bin/dehydrated-nsupdate
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+++ b/dehydrated/bin/dehydrated-nsupdate
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+#!/bin/sh
+
+# Open Infrastructure: service-tools
+
+# Copyright (C) 2014-2023 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