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