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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.unbound;
stateDir = "/var/lib/unbound";
access = concatMapStrings (x: " access-control: ${x} allow\n") cfg.allowedAccess;
interfaces = concatMapStrings (x: " interface: ${x}\n") cfg.interfaces;
isLocalAddress = x: substring 0 9 x == "127.0.0.1";
forward =
optionalString (any isLocalAddress cfg.forwardAddresses) ''
do-not-query-localhost: no
'' +
optionalString (cfg.forwardAddresses != []) ''
forward-zone:
name: .
'' +
concatMapStringsSep "\n" (x: " forward-addr: ${x}") cfg.forwardAddresses;
rootTrustAnchorFile = "${stateDir}/root.key";
trustAnchor = optionalString cfg.enableRootTrustAnchor
"auto-trust-anchor-file: ${rootTrustAnchorFile}";
confFile = pkgs.writeText "unbound.conf" ''
server:
directory: "${stateDir}"
username: unbound
chroot: "${stateDir}"
pidfile: ""
${interfaces}
${access}
${trustAnchor}
${cfg.extraConfig}
${forward}
'';
in
{
###### interface
options = {
services.unbound = {
enable = mkEnableOption "Unbound domain name server";
allowedAccess = mkOption {
default = [ "127.0.0.0/24" ];
type = types.listOf types.str;
description = "What networks are allowed to use unbound as a resolver.";
};
interfaces = mkOption {
default = [ "127.0.0.1" "::1" ];
type = types.listOf types.str;
description = "What addresses the server should listen on.";
};
forwardAddresses = mkOption {
default = [ ];
type = types.listOf types.str;
description = "What servers to forward queries to.";
};
enableRootTrustAnchor = mkOption {
default = true;
type = types.bool;
description = "Use and update root trust anchor for DNSSEC validation.";
};
extraConfig = mkOption {
default = "";
type = types.str;
description = ''
Extra unbound config. See
<citerefentry><refentrytitle>unbound.conf</refentrytitle><manvolnum>8
</manvolnum></citerefentry>.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.unbound ];
users.extraUsers = singleton {
name = "unbound";
uid = config.ids.uids.unbound;
description = "unbound daemon user";
home = stateDir;
createHome = true;
};
systemd.services.unbound = {
description = "Unbound recursive Domain Name Server";
after = [ "network.target" ];
before = [ "nss-lookup.target" ];
wants = [" nss-lookup.target" ];
wantedBy = [ "multi-user.target" ];
preStart = ''
mkdir -m 0755 -p ${stateDir}/dev/
cp ${confFile} ${stateDir}/unbound.conf
${optionalString cfg.enableRootTrustAnchor ''
${pkgs.unbound}/bin/unbound-anchor -a ${rootTrustAnchorFile}
chown unbound ${stateDir} ${rootTrustAnchorFile}
''}
touch ${stateDir}/dev/random
${pkgs.utillinux}/bin/mount --bind -n /dev/urandom ${stateDir}/dev/random
'';
serviceConfig = {
ExecStart = "${pkgs.unbound}/bin/unbound -d -c ${stateDir}/unbound.conf";
ExecStopPost="${pkgs.utillinux}/bin/umount ${stateDir}/dev/random";
};
};
};
}
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