134 lines
3.7 KiB
Nix
134 lines
3.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.kresd;
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package = pkgs.knot-resolver;
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configFile = pkgs.writeText "kresd.conf" cfg.extraConfig;
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in
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{
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meta.maintainers = [ maintainers.vcunat /* upstream developer */ ];
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###### interface
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options.services.kresd = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable knot-resolver domain name server.
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DNSSEC validation is turned on by default.
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You can run <literal>sudo nc -U /run/kresd/control</literal>
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and give commands interactively to kresd.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra lines to be added verbatim to the generated configuration file.
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'';
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};
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cacheDir = mkOption {
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type = types.path;
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default = "/var/cache/kresd";
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description = ''
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Directory for caches. They are intended to survive reboots.
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'';
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};
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interfaces = mkOption {
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type = with types; listOf str;
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default = [ "::1" "127.0.0.1" ];
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description = ''
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What addresses the server should listen on. (UDP+TCP 53)
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'';
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};
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listenTLS = mkOption {
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type = with types; listOf str;
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default = [];
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example = [ "198.51.100.1:853" "[2001:db8::1]:853" "853" ];
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description = ''
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Addresses on which kresd should provide DNS over TLS (see RFC 7858).
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For detailed syntax see ListenStream in man systemd.socket.
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'';
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};
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# TODO: perhaps options for more common stuff like cache size or forwarding
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.etc."kresd.conf".source = configFile; # not required
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users.extraUsers = singleton
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{ name = "kresd";
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uid = config.ids.uids.kresd;
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group = "kresd";
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description = "Knot-resolver daemon user";
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};
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users.extraGroups = singleton
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{ name = "kresd";
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gid = config.ids.gids.kresd;
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};
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systemd.sockets.kresd = rec {
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wantedBy = [ "sockets.target" ];
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before = wantedBy;
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listenStreams = map
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# Syntax depends on being IPv6 or IPv4.
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(iface: if elem ":" (stringToCharacters iface) then "[${iface}]:53" else "${iface}:53")
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cfg.interfaces;
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socketConfig.ListenDatagram = listenStreams;
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socketConfig.FreeBind = true;
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};
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systemd.sockets.kresd-tls = mkIf (cfg.listenTLS != []) rec {
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wantedBy = [ "sockets.target" ];
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before = wantedBy;
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partOf = [ "kresd.socket" ];
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listenStreams = cfg.listenTLS;
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socketConfig = {
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FileDescriptorName = "tls";
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FreeBind = true;
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Service = "kresd.service";
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};
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};
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systemd.sockets.kresd-control = rec {
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wantedBy = [ "sockets.target" ];
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before = wantedBy;
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partOf = [ "kresd.socket" ];
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listenStreams = [ "/run/kresd/control" ];
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socketConfig = {
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FileDescriptorName = "control";
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Service = "kresd.service";
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SocketMode = "0660"; # only root user/group may connect and control kresd
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};
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};
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systemd.tmpfiles.rules = [ "d '${cfg.cacheDir}' 0770 kresd kresd - -" ];
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systemd.services.kresd = {
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description = "Knot-resolver daemon";
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serviceConfig = {
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User = "kresd";
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Type = "notify";
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WorkingDirectory = cfg.cacheDir;
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Restart = "on-failure";
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Sockets = [ "kresd.socket" "kresd-control.socket" ]
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++ optional (cfg.listenTLS != []) "kresd-tls.socket";
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};
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# Trust anchor goes from dns-root-data by default.
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script = ''
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exec '${package}/bin/kresd' --config '${configFile}' --forks=1
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'';
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requires = [ "kresd.socket" ];
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};
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};
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}
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