nixos-config/zones/signzone.nix

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{
dns,
ksk,
zsk,
zone,
zonename,
...
}: {
pkgs,
system,
...
}: let
inherit (dns.util.${system}) writeZone;
zoneFile = writeZone zonename zone;
in {
systemd.services."zonesign@${zonename}" = {
description = "Signing the DNS zone '${zonename}'";
wantedBy = ["bind.service"];
before = ["bind.service"];
script = ''
set -ex
# Create the named directory if it doesnt exist
${pkgs.coreutils}/bin/mkdir -pv /var/lib/named
# Sign the zone and write it to /var/lib/named
${pkgs.bind}/bin/dnssec-signzone -o ${zonename} -k /run/secrets/${ksk} -a -3 $(${pkgs.coreutils}/bin/head -c 16 /dev/urandom | ${pkgs.coreutils}/bin/sha256sum | ${pkgs.coreutils}/bin/cut -b 1-32) -f /var/lib/named/${zonename} ${zoneFile} /run/secrets/${zsk}
${pkgs.systemd}/bin/systemctl reload bind || true
'';
};
systemd.timers."zonesign@${zonename}" = {
description = "Resign the DNS zone '${zonename}'";
timerConfig = {
Unit = "zonesign@${zonename}.service";
OnUnitInactiveSec = 86400;
RandomizedDelaySec = 3600;
};
wantedBy = ["bind.service"];
};
sops.secrets."${ksk}.key" = {};
sops.secrets."${ksk}.private" = {};
sops.secrets."${zsk}.key" = {};
sops.secrets."${zsk}.private" = {};
}