#!/usr/bin/perl
# Called by the let's encrypt client to add a DNS record for validation
$no_acl_check++;
$ENV{'WEBMIN_CONFIG'} ||= "/etc/webmin";
$ENV{'WEBMIN_VAR'} ||= "/var/webmin";
if ($0 =~ /^(.*)\/[^\/]+$/) {
chdir($pwd = $1);
}
else {
chop($pwd = `pwd`);
}
$0 = "$pwd/letsencrypt-dns.pl";
require './webmin-lib.pl';
&foreign_require("bind8");
# Validate params
my $dname = $ENV{'CERTBOT_DOMAIN'};
my $val = $ENV{'CERTBOT_VALIDATION'};
$dname || die "Missing CERTBOT_DOMAIN environment variable";
$val || die "Missing CERTBOT_VALIDATION environment variable";
# Find the DNS domain and records
$d = &get_virtualmin_for_domain($dname);
my ($zone, $zname) = &get_bind_zone_for_domain($dname);
my ($recs, $file);
if ($zone) {
# Use BIND module API calls
$zone->{'file'} || die "Zone $dname does not have a records file";
&lock_file(&bind8::make_chroot(&bind8::absolute_path($zone->{'file'})));
$recs = [ &bind8::read_zone_file($zone->{'file'}, $zname) ];
$file = $zone->{'file'};
}
elsif ($d) {
# Use Virtualmin API calls
&virtual_server::obtain_lock_dns($d);
($recs, $file) = &virtual_server::get_domain_dns_records_and_file($d);
}
else {
die "No DNS zone named $dname found";
}
# Remove any existing record
my ($r) = grep { $_->{'name'} eq "_acme-challenge.".$dname."." } @$recs;
if ($r) {
&bind8::delete_record($file, $r);
}
# Create the needed DNS record
&bind8::create_record($file,
"_acme-challenge.".$dname.".",
5,
"IN",
"TXT",
$val);
my $err;
if ($zone) {
# Apply using BIND API calls
&bind8::bump_soa_record($file, $recs);
&bind8::sign_dnssec_zone_if_key($zone, $recs);
&unlock_file(&bind8::make_chroot(&bind8::absolute_path($file)));
&bind8::restart_zone($zone->{'name'}, $zone->{'view'});
}
else {
# Apply using Virtualmin API
$err = &virtual_server::post_records_change($d, $recs, $file);
&virtual_server::release_lock_dns($d);
&virtual_server::reload_bind_records($d);
}
die $err if ($err);
sleep($config{'letsencrypt_dns_wait'} || 10); # Wait for DNS propagation
&webmin_log("letsencryptdns", undef, $dname);
exit(0);
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