284 lines
8.6 KiB
Nix
284 lines
8.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfgs = config.services;
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cfg = cfgs.ncdns;
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dataDir = "/var/lib/ncdns";
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username = "ncdns";
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valueType = with types; oneOf [ int str bool path ]
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// { description = "setting type (integer, string, bool or path)"; };
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configType = with types; attrsOf (nullOr (either valueType configType))
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// { description = ''
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ncdns.conf configuration type. The format consists of an
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attribute set of settings. Each setting can be either `null`,
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a value or an attribute set. The allowed values are integers,
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strings, booleans or paths.
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'';
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};
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configFile = pkgs.runCommand "ncdns.conf"
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{ json = builtins.toJSON cfg.settings;
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passAsFile = [ "json" ];
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}
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"${pkgs.remarshal}/bin/json2toml < $jsonPath > $out";
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defaultFiles = {
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public = "${dataDir}/bit.key";
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private = "${dataDir}/bit.private";
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zonePublic = "${dataDir}/bit-zone.key";
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zonePrivate = "${dataDir}/bit-zone.private";
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};
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# if all keys are the default value
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needsKeygen = all id (flip mapAttrsToList cfg.dnssec.keys
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(n: v: v == getAttr n defaultFiles));
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mkDefaultAttrs = mapAttrs (n: v: mkDefault v);
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in
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{
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###### interface
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options = {
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services.ncdns = {
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enable = mkEnableOption ''
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ncdns, a Go daemon to bridge Namecoin to DNS.
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To resolve .bit domains set <literal>services.namecoind.enable = true;</literal>
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and an RPC username/password
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'';
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address = mkOption {
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type = types.str;
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default = "[::1]";
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description = lib.mdDoc ''
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The IP address the ncdns resolver will bind to. Leave this unchanged
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if you do not wish to directly expose the resolver.
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'';
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};
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port = mkOption {
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type = types.port;
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default = 5333;
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description = lib.mdDoc ''
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The port the ncdns resolver will bind to.
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'';
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};
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identity.hostname = mkOption {
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type = types.str;
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default = config.networking.hostName;
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defaultText = literalExpression "config.networking.hostName";
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example = "example.com";
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description = ''
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The hostname of this ncdns instance, which defaults to the machine
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hostname. If specified, ncdns lists the hostname as an NS record at
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the zone apex:
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<programlisting>
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bit. IN NS ns1.example.com.
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</programlisting>
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If unset ncdns will generate an internal psuedo-hostname under the
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zone, which will resolve to the value of
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<option>services.ncdns.identity.address</option>.
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If you are only using ncdns locally you can ignore this.
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'';
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};
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identity.hostmaster = mkOption {
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type = types.str;
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default = "";
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example = "root@example.com";
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description = lib.mdDoc ''
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An email address for the SOA record at the bit zone.
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If you are only using ncdns locally you can ignore this.
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'';
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};
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identity.address = mkOption {
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type = types.str;
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default = "127.127.127.127";
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description = lib.mdDoc ''
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The IP address the hostname specified in
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{option}`services.ncdns.identity.hostname` should resolve to.
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If you are only using ncdns locally you can ignore this.
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'';
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};
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dnssec.enable = mkEnableOption ''
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DNSSEC support in ncdns. This will generate KSK and ZSK keypairs
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(unless provided via the options
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<option>services.ncdns.dnssec.publicKey</option>,
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<option>services.ncdns.dnssec.privateKey</option> etc.) and add a trust
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anchor to recursive resolvers
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'';
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dnssec.keys.public = mkOption {
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type = types.path;
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default = defaultFiles.public;
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description = ''
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Path to the file containing the KSK public key.
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The key can be generated using the <literal>dnssec-keygen</literal>
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command, provided by the package <package>bind</package> as follows:
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<programlisting>
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$ dnssec-keygen -a RSASHA256 -3 -b 2048 -f KSK bit
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</programlisting>
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'';
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};
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dnssec.keys.private = mkOption {
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type = types.path;
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default = defaultFiles.private;
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description = lib.mdDoc ''
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Path to the file containing the KSK private key.
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'';
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};
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dnssec.keys.zonePublic = mkOption {
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type = types.path;
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default = defaultFiles.zonePublic;
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description = ''
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Path to the file containing the ZSK public key.
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The key can be generated using the <literal>dnssec-keygen</literal>
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command, provided by the package <package>bind</package> as follows:
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<programlisting>
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$ dnssec-keygen -a RSASHA256 -3 -b 2048 bit
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</programlisting>
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'';
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};
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dnssec.keys.zonePrivate = mkOption {
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type = types.path;
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default = defaultFiles.zonePrivate;
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description = lib.mdDoc ''
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Path to the file containing the ZSK private key.
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'';
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};
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settings = mkOption {
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type = configType;
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default = { };
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example = literalExpression ''
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{ # enable webserver
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ncdns.httplistenaddr = ":8202";
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# synchronize TLS certs
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certstore.nss = true;
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# note: all paths are relative to the config file
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certstore.nsscertdir = "../../var/lib/ncdns";
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certstore.nssdbdir = "../../home/alice/.pki/nssdb";
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}
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'';
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description = lib.mdDoc ''
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ncdns settings. Use this option to configure ncds
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settings not exposed in a NixOS option or to bypass one.
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See the example ncdns.conf file at <https://github.com/namecoin/ncdns/blob/master/_doc/ncdns.conf.example>
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for the available options.
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'';
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};
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};
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services.pdns-recursor.resolveNamecoin = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Resolve `.bit` top-level domains using ncdns and namecoin.
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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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services.pdns-recursor = mkIf cfgs.pdns-recursor.resolveNamecoin {
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forwardZonesRecurse.bit = "${cfg.address}:${toString cfg.port}";
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luaConfig =
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if cfg.dnssec.enable
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then ''readTrustAnchorsFromFile("${cfg.dnssec.keys.public}")''
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else ''addNTA("bit", "namecoin DNSSEC disabled")'';
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};
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# Avoid pdns-recursor not finding the DNSSEC keys
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systemd.services.pdns-recursor = mkIf cfgs.pdns-recursor.resolveNamecoin {
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after = [ "ncdns.service" ];
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wants = [ "ncdns.service" ];
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};
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services.ncdns.settings = mkDefaultAttrs {
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ncdns =
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{ # Namecoin RPC
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namecoinrpcaddress =
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"${cfgs.namecoind.rpc.address}:${toString cfgs.namecoind.rpc.port}";
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namecoinrpcusername = cfgs.namecoind.rpc.user;
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namecoinrpcpassword = cfgs.namecoind.rpc.password;
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# Identity
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selfname = cfg.identity.hostname;
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hostmaster = cfg.identity.hostmaster;
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selfip = cfg.identity.address;
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# Other
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bind = "${cfg.address}:${toString cfg.port}";
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}
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// optionalAttrs cfg.dnssec.enable
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{ # DNSSEC
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publickey = "../.." + cfg.dnssec.keys.public;
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privatekey = "../.." + cfg.dnssec.keys.private;
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zonepublickey = "../.." + cfg.dnssec.keys.zonePublic;
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zoneprivatekey = "../.." + cfg.dnssec.keys.zonePrivate;
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};
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# Daemon
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service.daemon = true;
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xlog.journal = true;
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};
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users.users.ncdns = {
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isSystemUser = true;
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group = "ncdns";
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description = "ncdns daemon user";
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};
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users.groups.ncdns = {};
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systemd.services.ncdns = {
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description = "ncdns daemon";
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after = [ "namecoind.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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User = "ncdns";
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StateDirectory = "ncdns";
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Restart = "on-failure";
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ExecStart = "${pkgs.ncdns}/bin/ncdns -conf=${configFile}";
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};
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preStart = optionalString (cfg.dnssec.enable && needsKeygen) ''
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cd ${dataDir}
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if [ ! -e bit.key ]; then
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${pkgs.bind}/bin/dnssec-keygen -a RSASHA256 -3 -b 2048 bit
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mv Kbit.*.key bit-zone.key
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mv Kbit.*.private bit-zone.private
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${pkgs.bind}/bin/dnssec-keygen -a RSASHA256 -3 -b 2048 -f KSK bit
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mv Kbit.*.key bit.key
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mv Kbit.*.private bit.private
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fi
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'';
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};
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};
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meta.maintainers = with lib.maintainers; [ rnhmjoj ];
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}
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