134 lines
3.4 KiB
Nix
134 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.unbound;
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stateDir = "/var/lib/unbound";
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access = concatMapStringsSep "\n " (x: "access-control: ${x} allow") cfg.allowedAccess;
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interfaces = concatMapStringsSep "\n " (x: "interface: ${x}") cfg.interfaces;
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isLocalAddress = x: substring 0 3 x == "::1" || substring 0 9 x == "127.0.0.1";
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forward =
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optionalString (any isLocalAddress cfg.forwardAddresses) ''
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do-not-query-localhost: no
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'' +
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optionalString (cfg.forwardAddresses != []) ''
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forward-zone:
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name: .
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'' +
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concatMapStringsSep "\n" (x: " forward-addr: ${x}") cfg.forwardAddresses;
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rootTrustAnchorFile = "${stateDir}/root.key";
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trustAnchor = optionalString cfg.enableRootTrustAnchor
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"auto-trust-anchor-file: ${rootTrustAnchorFile}";
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confFile = pkgs.writeText "unbound.conf" ''
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server:
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directory: "${stateDir}"
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username: unbound
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chroot: "${stateDir}"
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pidfile: ""
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${interfaces}
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${access}
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${trustAnchor}
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${cfg.extraConfig}
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${forward}
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'';
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in
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{
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###### interface
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options = {
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services.unbound = {
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enable = mkEnableOption "Unbound domain name server";
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allowedAccess = mkOption {
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default = [ "127.0.0.0/24" ];
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type = types.listOf types.str;
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description = "What networks are allowed to use unbound as a resolver.";
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};
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interfaces = mkOption {
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default = [ "127.0.0.1" "::1" ];
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type = types.listOf types.str;
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description = "What addresses the server should listen on.";
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};
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forwardAddresses = mkOption {
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default = [ ];
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type = types.listOf types.str;
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description = "What servers to forward queries to.";
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};
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enableRootTrustAnchor = mkOption {
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default = true;
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type = types.bool;
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description = "Use and update root trust anchor for DNSSEC validation.";
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};
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extraConfig = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Extra unbound config. See
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<citerefentry><refentrytitle>unbound.conf</refentrytitle><manvolnum>8
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</manvolnum></citerefentry>.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.unbound ];
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users.users.unbound = {
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description = "unbound daemon user";
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isSystemUser = true;
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};
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systemd.services.unbound = {
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description = "Unbound recursive Domain Name Server";
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after = [ "network.target" ];
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before = [ "nss-lookup.target" ];
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wants = [ "nss-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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mkdir -m 0755 -p ${stateDir}/dev/
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cp ${confFile} ${stateDir}/unbound.conf
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${optionalString cfg.enableRootTrustAnchor ''
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${pkgs.unbound}/bin/unbound-anchor -a ${rootTrustAnchorFile} || echo "Root anchor updated!"
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chown unbound ${stateDir} ${rootTrustAnchorFile}
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''}
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touch ${stateDir}/dev/random
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${pkgs.utillinux}/bin/mount --bind -n /dev/urandom ${stateDir}/dev/random
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'';
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serviceConfig = {
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ExecStart = "${pkgs.unbound}/bin/unbound -d -c ${stateDir}/unbound.conf";
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ExecStopPost="${pkgs.utillinux}/bin/umount ${stateDir}/dev/random";
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ProtectSystem = true;
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ProtectHome = true;
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PrivateDevices = true;
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};
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};
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};
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}
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