config/modules/services/nsd-acme/default.nix

158 lines
4.7 KiB
Nix

{
config,
lib,
pkgs,
...
}: let
mkHook = zone: let
rc = config.services.nsd.remoteControl;
fullZone = "_acme-endpoint.${zone}";
nsdconf = ''"$RUNTIME_DIRECTORY"/nsd.conf'';
in
pkgs.writeShellScript "nsd-acme-hook" ''
set -euo pipefail
METHOD=$1
TYPE=$2
AUTH=$5
NOW=$(date +%y%m%d%H%M)
DIR="/var/lib/nsd/zones"
sed \
-e "s~${rc.controlKeyFile}~$CREDENTIALS_DIRECTORY/nsd_control.key~" \
-e "s~${rc.controlCertFile}~$CREDENTIALS_DIRECTORY/nsd_control.pem~" \
-e "s~${rc.serverKeyFile}~$CREDENTIALS_DIRECTORY/nsd_server.key~" \
-e "s~${rc.serverCertFile}~$CREDENTIALS_DIRECTORY/nsd_server.pem~" \
/etc/nsd/nsd.conf > ${nsdconf}
[ "$TYPE" != "dns-01" ] && { echo "Skipping $TYPE"; exit 1; }
write_zone() {
cat <<EOF
\$ORIGIN ${fullZone}.
\$TTL 60
@ SOA ${fullZone}. motiejus.jakstys.lt. ($NOW 12h 2h 2w 1h)
@ TXT $AUTH
EOF
}
cleanup() {
nsd-control delzone ${fullZone}
rm -f "$DIR/${fullZone}.acme"
}
case "$METHOD" in
begin)
echo "Deleting previous ${fullZone} if exists ..."
nsd-control -c ${nsdconf} delzone ${fullZone} || :
write_zone > "$DIR/${fullZone}.acme"
echo "Activating ${fullZone}"
nsd-control -c ${nsdconf} addzone ${fullZone} acme
;;
done)
echo "ACME request successful, cleaning up"
cleanup
;;
failed)
echo "ACME request failed, cleaning up"
cleanup
;;
esac
'';
in {
options.mj.services.nsd-acme = with lib.types; {
enable = lib.mkEnableOption "enable acme certs via nsd";
zones = lib.mkOption {
default = {};
type = attrsOf (submodule (
{...}: {
options = {
accountKey = lib.mkOption {type = path;};
days = lib.mkOption {
type = int;
default = 30;
};
staging = lib.mkOption {
type = bool;
default = false;
};
};
}
));
};
};
# TODO assert services.nsd.enable
config = lib.mkIf config.mj.services.nsd-acme.enable {
services.nsd.remoteControl.enable = true;
services.nsd.extraConfig = ''
pattern:
name: "acme"
zonefile: "/var/lib/nsd/zones/%s.acme"
'';
systemd.services =
{
nsd-control-setup = {
requiredBy = ["nsd.service"];
before = ["nsd.service"];
unitConfig.ConditionPathExists = let
rc = config.services.nsd.remoteControl;
in [
"|!${rc.controlKeyFile}"
"|!${rc.controlCertFile}"
"|!${rc.serverKeyFile}"
"|!${rc.serverCertFile}"
];
serviceConfig = {
Type = "oneshot";
UMask = 0077;
ExecStart = "${pkgs.nsd}/bin/nsd-control-setup";
};
path = [pkgs.openssl];
};
}
// lib.mapAttrs'
(
zone: cfg: let
sanitized = lib.strings.sanitizeDerivationName zone;
in
lib.nameValuePair "nsd-acme-${sanitized}" {
description = "dns-01 acme update for ${zone}";
path = [pkgs.openssh pkgs.nsd];
preStart = ''
mkdir -p "$STATE_DIRECTORY/private"
ln -sf "$CREDENTIALS_DIRECTORY/letsencrypt-account-key" \
"$STATE_DIRECTORY/private/key.pem"
'';
serviceConfig = {
ExecStart = let
hook = mkHook zone;
days = builtins.toString cfg.days;
staging =
if cfg.staging
then "--staging"
else "";
in "${pkgs.uacme}/bin/uacme -c \"$STATE_DIRECTORY\" --verbose --days ${days} --hook ${hook} ${staging} issue ${zone}";
DynamicUser = "yes";
StateDirectory = "nsd-acme/${sanitized}";
RuntimeDirectory = "nsd-acme/${sanitized}";
LoadCredential = let
rc = config.services.nsd.remoteControl;
in [
"nsd_control.key:${rc.controlKeyFile}"
"nsd_control.pem:${rc.controlCertFile}"
"nsd_server.key:${rc.serverKeyFile}"
"nsd_server.pem:${rc.serverCertFile}"
"letsencrypt-account-key:${cfg.accountKey}"
];
};
}
)
config.mj.services.nsd-acme.zones;
mj.base.unitstatus.units = lib.mkIf config.mj.base.unitstatus.enable ["nsd-control-setup"];
};
}