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124 lines
3 KiB
Nix
124 lines
3 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 = concatMapStrings (x: " access-control: ${x} allow\n") cfg.allowedAccess;
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interfaces = concatMapStrings (x: " interface: ${x}\n") cfg.interfaces;
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forward = optionalString (length cfg.forwardAddresses != 0)
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"forward-zone:\n name: .\n" +
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concatMapStrings (x: " forward-addr: ${x}\n") cfg.forwardAddresses;
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rootTrustAnchorFile = "${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 = mkOption {
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default = false;
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type = types.bool;
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description = "Whether to enable the Unbound domain name server.";
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};
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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.str;
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description = "Extra lines of unbound config.";
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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.extraUsers = singleton {
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name = "unbound";
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uid = config.ids.uids.unbound;
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description = "unbound daemon user";
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home = stateDir;
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createHome = 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} ${stateDir}/unbound.conf
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${pkgs.unbound}/bin/unbound-anchor -a ${rootTrustAnchorFile}
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chown unbound ${stateDir} ${rootTrustAnchorFile}
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touch ${stateDir}/dev/random
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${pkgs.utillinux}/bin/mount --bind -n /dev/random ${stateDir}/dev/random
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'';
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serviceConfig = {
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ExecStart = "${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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};
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};
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};
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}
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