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|
#! /bin/sh
# This source code is released into the public domain.
. /usr/local/share/lfacme/init.sh
# begin, done or failed
ACTION=$1
# ACME method, must be dns-01.
METHOD=$2
# This is the full domain name we're authorising.
DOMAIN=$3
# Token name, not used for dns-01.
TOKEN=$4
# The token value we need to create.
AUTH=$5
if [ "$#" -ne 5 ]; then
_fatal "missing arguments"
fi
if [ "$METHOD" != "dns-01" ]; then
exit 1
fi
if ! kinit -k -t /etc/krb5.keytab "$ACME_KERBEROS_PRINCIPAL"; then
_fatal "failed to obtain a Kerberos ticket"
fi
# Keep removing labels from the name until we find one with nameservers.
_getnameservers() {
local domain="$1"
local _trydomain="$domain"
while ! [ -z "$_trydomain" ]; do
if [ "$_trydomain" = "${_trydomain#*.}" ]; then
# If there are no dots in the domain, we couldn't
# find the nameservers.
break
fi
# For CNAME records, a query for NS will return the CNAME.
# Therefore we have to check we actually got NS records.
local nameservers="$(
dig "$_trydomain" ns +noall +answer | \
awk '$4 == "NS" { print $5 }'
)"
if ! [ -z "$nameservers" ]; then
echo "$nameservers"
return
fi
_trydomain="${_trydomain#*.}"
done
_fatal "unable to find nameservers for %s" "$_trydomain"
}
# Add a new record using nsupdate.
_add_record() {
local domain="$1"
local auth="$2"
nsupdate -g <<EOF
update add _acme-challenge.${DOMAIN}. 300 IN TXT "${AUTH}"
send
EOF
return $?
}
# Remove an existing record using nsupdate.
_remove_record() {
local domain="$1"
local auth="$2"
nsupdate -g <<EOF
update delete _acme-challenge.${DOMAIN}. 300 IN TXT "${AUTH}"
send
EOF
return $?
}
# Wait for the DNS record to appear on a specific nameserver.
_wait_for_nameserver() {
local domain="$1"
local auth="$2"
local nameserver="$3"
echo "waiting for $domain on nameserver $ns..."
local waited=0
local waitlimit=60
while sleep 1; do
waited=$((waited + 1))
if [ "$waited" -ge "$waitlimit" ]; then
_error "timed out waiting for nameserver update for %s" \
"$domain"
return 1
fi
data="$(dig "_acme-challenge.$domain" txt @$nameserver +short)"
if [ -z "$data" ]; then
continue
fi
if [ "$data" = "\"$auth\"" ]; then
return 0
fi
done
}
# Wait for DNS servers to have the given record.
_wait_for_record() {
local domain="$1"
local auth="$2"
local nameservers="$(_getnameservers "$domain")"
for ns in $nameservers; do
_wait_for_nameserver "$domain" "$auth" "$ns" || return 1
done
return 0
}
case "$ACTION" in
begin)
_add_record "$DOMAIN" "$AUTH" \
&& _wait_for_record "$DOMAIN" "$AUTH"
exit $?
;;
done|failed)
_remove_record "$DOMAIN" "$AUTH"
exit $?
;;
*)
_fatal "unknown action: %s" "$ACTION"
;;
esac
|
