2018-05-16 14:16:30 +01:00
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{ config, lib, pkgs, ...}:
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with lib;
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let
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cfg = config.services.stubby;
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fallbacks = concatMapStringsSep "\n " (x: "- ${x}") cfg.fallbackProtocols;
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listeners = concatMapStringsSep "\n " (x: "- ${x}") cfg.listenAddresses;
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# By default, the recursive resolvers maintained by the getdns
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# project itself are enabled. More information about both getdns's servers,
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# as well as third party options for upstream resolvers, can be found here:
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# https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Test+Servers
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#
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# You can override these values by supplying a yaml-formatted array of your
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# preferred upstream resolvers in the following format:
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#
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# 106 # - address_data: IPv4 or IPv6 address of the upstream
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# port: Port for UDP/TCP (default is 53)
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# tls_auth_name: Authentication domain name checked against the server
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# certificate
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# tls_pubkey_pinset: An SPKI pinset verified against the keys in the server
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# certificate
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# - digest: Only "sha256" is currently supported
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# value: Base64 encoded value of the sha256 fingerprint of the public
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# key
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# tls_port: Port for TLS (default is 853)
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defaultUpstream = ''
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- address_data: 145.100.185.15
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tls_auth_name: "dnsovertls.sinodun.com"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: 62lKu9HsDVbyiPenApnc4sfmSYTHOVfFgL3pyB+cBL4=
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- address_data: 145.100.185.16
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tls_auth_name: "dnsovertls1.sinodun.com"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: cE2ecALeE5B+urJhDrJlVFmf38cJLAvqekONvjvpqUA=
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- address_data: 185.49.141.37
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tls_auth_name: "getdnsapi.net"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: foxZRnIh9gZpWnl+zEiKa0EJ2rdCGroMWm02gaxSc9Q=
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- address_data: 2001:610:1:40ba:145:100:185:15
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tls_auth_name: "dnsovertls.sinodun.com"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: 62lKu9HsDVbyiPenApnc4sfmSYTHOVfFgL3pyB+cBL4=
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- address_data: 2001:610:1:40ba:145:100:185:16
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tls_auth_name: "dnsovertls1.sinodun.com"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: cE2ecALeE5B+urJhDrJlVFmf38cJLAvqekONvjvpqUA=
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- address_data: 2a04:b900:0:100::38
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tls_auth_name: "getdnsapi.net"
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tls_pubkey_pinset:
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- digest: "sha256"
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value: foxZRnIh9gZpWnl+zEiKa0EJ2rdCGroMWm02gaxSc9Q=
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'';
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# Resolution type is not changeable here because it is required per the
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# stubby documentation:
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#
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# "resolution_type: Work in stub mode only (not recursive mode) - required for Stubby
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# operation."
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#
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# https://dnsprivacy.org/wiki/display/DP/Configuring+Stubby
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confFile = pkgs.writeText "stubby.yml" ''
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resolution_type: GETDNS_RESOLUTION_STUB
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dns_transport_list:
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${fallbacks}
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2020-02-24 10:51:43 +00:00
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appdata_dir: "/var/cache/stubby"
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2018-05-16 14:16:30 +01:00
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tls_authentication: ${cfg.authenticationMode}
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tls_query_padding_blocksize: ${toString cfg.queryPaddingBlocksize}
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edns_client_subnet_private: ${if cfg.subnetPrivate then "1" else "0"}
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idle_timeout: ${toString cfg.idleTimeout}
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listen_addresses:
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${listeners}
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round_robin_upstreams: ${if cfg.roundRobinUpstreams then "1" else "0"}
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${cfg.extraConfig}
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upstream_recursive_servers:
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${cfg.upstreamServers}
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'';
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in
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{
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options = {
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services.stubby = {
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enable = mkEnableOption "Stubby DNS resolver";
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fallbackProtocols = mkOption {
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default = [ "GETDNS_TRANSPORT_TLS" ];
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type = with types; listOf (enum [
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"GETDNS_TRANSPORT_TLS"
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"GETDNS_TRANSPORT_TCP"
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"GETDNS_TRANSPORT_UDP"
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]);
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description = ''
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Ordered list composed of one or more transport protocols.
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Strict mode should only use <literal>GETDNS_TRANSPORT_TLS</literal>.
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Other options are <literal>GETDNS_TRANSPORT_UDP</literal> and
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<literal>GETDNS_TRANSPORT_TCP</literal>.
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'';
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};
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authenticationMode = mkOption {
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default = "GETDNS_AUTHENTICATION_REQUIRED";
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type = types.enum [
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"GETDNS_AUTHENTICATION_REQUIRED"
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"GETDNS_AUTHENTICATION_NONE"
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];
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description = ''
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Selects the Strict or Opportunistic usage profile.
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For strict, set to <literal>GETDNS_AUTHENTICATION_REQUIRED</literal>.
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for opportunistic, use <literal>GETDNS_AUTHENTICATION_NONE</literal>.
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'';
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};
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queryPaddingBlocksize = mkOption {
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default = 128;
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type = types.int;
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description = ''
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EDNS0 option to pad the size of the DNS query to the given blocksize.
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'';
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};
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subnetPrivate = mkOption {
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default = true;
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type = types.bool;
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description = ''
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EDNS0 option for ECS client privacy. Default is
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<literal>true</literal>. If set, this option prevents the client
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subnet from being sent to authoritative nameservers.
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'';
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};
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idleTimeout = mkOption {
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default = 10000;
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type = types.int;
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description = "EDNS0 option for keepalive idle timeout expressed in
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milliseconds.";
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};
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listenAddresses = mkOption {
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default = [ "127.0.0.1" "0::1" ];
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type = with types; listOf str;
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description = ''
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Sets the listen address for the stubby daemon.
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Uses port 53 by default.
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Ise IP@port to specify a different port.
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'';
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};
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roundRobinUpstreams = mkOption {
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default = true;
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type = types.bool;
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description = ''
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Instructs stubby to distribute queries across all available name
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servers. Default is <literal>true</literal>. Set to
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<literal>false</literal> in order to use the first available.
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'';
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};
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upstreamServers = mkOption {
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default = defaultUpstream;
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type = types.lines;
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description = ''
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2019-08-07 13:23:20 +01:00
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Replace default upstreams. See <citerefentry><refentrytitle>stubby
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2018-05-16 14:16:30 +01:00
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</refentrytitle><manvolnum>1</manvolnum></citerefentry> for an
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example of the entry formatting. In Strict mode, at least one of the
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following settings must be supplied for each nameserver:
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<literal>tls_auth_name</literal> or
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<literal>tls_pubkey_pinset</literal>.
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'';
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};
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debugLogging = mkOption {
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default = false;
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type = types.bool;
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description = "Enable or disable debug level logging.";
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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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Add additional configuration options. see <citerefentry>
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<refentrytitle>stubby</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>for more options.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.stubby ];
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systemd.services.stubby = {
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description = "Stubby local DNS resolver";
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after = [ "network.target" ];
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before = [ "nss-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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AmbientCapabilities = "CAP_NET_BIND_SERVICE";
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CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
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ExecStart = "${pkgs.stubby}/bin/stubby -C ${confFile} ${optionalString cfg.debugLogging "-l"}";
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DynamicUser = true;
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2020-02-24 10:51:43 +00:00
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CacheDirectory = "stubby";
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2018-05-16 14:16:30 +01:00
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};
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};
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};
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}
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