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|
{ config, lib, pkgs, ... }:
with lib;
let
dataDir = "/var/lib/pdns-recursor";
username = "pdns-recursor";
cfg = config.services.pdns-recursor;
zones = mapAttrsToList (zone: uri: "${zone}.=${uri}") cfg.forwardZones;
configFile = pkgs.writeText "recursor.conf" ''
local-address=${cfg.dns.address}
local-port=${toString cfg.dns.port}
allow-from=${concatStringsSep "," cfg.dns.allowFrom}
webserver-address=${cfg.api.address}
webserver-port=${toString cfg.api.port}
webserver-allow-from=${concatStringsSep "," cfg.api.allowFrom}
forward-zones=${concatStringsSep "," zones}
export-etc-hosts=${if cfg.exportHosts then "yes" else "no"}
dnssec=${cfg.dnssecValidation}
serve-rfc1918=${if cfg.serveRFC1918 then "yes" else "no"}
${cfg.extraConfig}
'';
in {
options.services.pdns-recursor = {
enable = mkEnableOption "PowerDNS Recursor, a recursive DNS server";
dns.address = mkOption {
type = types.str;
default = "0.0.0.0";
description = ''
IP address Recursor DNS server will bind to.
'';
};
dns.port = mkOption {
type = types.int;
default = 53;
description = ''
Port number Recursor DNS server will bind to.
'';
};
dns.allowFrom = mkOption {
type = types.listOf types.str;
default = [ "10.0.0.0/8" "172.16.0.0/12" "192.168.0.0/16" ];
example = [ "0.0.0.0/0" ];
description = ''
IP address ranges of clients allowed to make DNS queries.
'';
};
api.address = mkOption {
type = types.str;
default = "0.0.0.0";
description = ''
IP address Recursor REST API server will bind to.
'';
};
api.port = mkOption {
type = types.int;
default = 8082;
description = ''
Port number Recursor REST API server will bind to.
'';
};
api.allowFrom = mkOption {
type = types.listOf types.str;
default = [ "0.0.0.0/0" ];
description = ''
IP address ranges of clients allowed to make API requests.
'';
};
exportHosts = mkOption {
type = types.bool;
default = false;
description = ''
Whether to export names and IP addresses defined in /etc/hosts.
'';
};
forwardZones = mkOption {
type = types.attrs;
example = { eth = "127.0.0.1:5353"; };
default = {};
description = ''
DNS zones to be forwarded to other servers.
'';
};
dnssecValidation = mkOption {
type = types.enum ["off" "process-no-validate" "process" "log-fail" "validate"];
default = "validate";
description = ''
Controls the level of DNSSEC processing done by the PowerDNS Recursor.
See https://doc.powerdns.com/md/recursor/dnssec/ for a detailed explanation.
'';
};
serveRFC1918 = mkOption {
type = types.bool;
default = true;
description = ''
Whether to directly resolve the RFC1918 reverse-mapping domains:
<literal>10.in-addr.arpa</literal>,
<literal>168.192.in-addr.arpa</literal>,
<literal>16-31.172.in-addr.arpa</literal>
This saves load on the AS112 servers.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Extra options to be appended to the configuration file.
'';
};
};
config = mkIf cfg.enable {
users.users."${username}" = {
home = dataDir;
createHome = true;
uid = config.ids.uids.pdns-recursor;
description = "PowerDNS Recursor daemon user";
};
systemd.services.pdns-recursor = {
unitConfig.Documentation = "man:pdns_recursor(1) man:rec_control(1)";
description = "PowerDNS recursive server";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
User = username;
Restart ="on-failure";
RestartSec = "5";
PrivateTmp = true;
PrivateDevices = true;
AmbientCapabilities = "cap_net_bind_service";
ExecStart = ''${pkgs.pdns-recursor}/bin/pdns_recursor \
--config-dir=${dataDir} \
--socket-dir=${dataDir} \
--disable-syslog
'';
};
preStart = ''
# Link configuration file into recursor home directory
configPath=${dataDir}/recursor.conf
if [ "$(realpath $configPath)" != "${configFile}" ]; then
rm -f $configPath
ln -s ${configFile} $configPath
fi
'';
};
};
}
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