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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.unbound;
stateDir = "/var/lib/unbound";
access = concatMapStringsSep "\n " (x: "access-control: ${x} allow") cfg.allowedAccess;
interfaces = concatMapStringsSep "\n " (x: "interface: ${x}") cfg.interfaces;
isLocalAddress = x: substring 0 3 x == "::1" || substring 0 9 x == "127.0.0.1";
forward =
optionalString (any isLocalAddress cfg.forwardAddresses) ''
do-not-query-localhost: no
''
+ optionalString (cfg.forwardAddresses != []) ''
forward-zone:
name: .
''
+ concatMapStringsSep "\n" (x: " forward-addr: ${x}") cfg.forwardAddresses;
rootTrustAnchorFile = "${stateDir}/root.key";
trustAnchor = optionalString cfg.enableRootTrustAnchor
"auto-trust-anchor-file: ${rootTrustAnchorFile}";
confFile = pkgs.writeText "unbound.conf" ''
server:
ip-freebind: yes
directory: "${stateDir}"
username: unbound
chroot: ""
pidfile: ""
# when running under systemd there is no need to daemonize
do-daemonize: no
${interfaces}
${access}
${trustAnchor}
${lib.optionalString (cfg.localControlSocketPath != null) ''
remote-control:
control-enable: yes
control-interface: ${cfg.localControlSocketPath}
''}
${cfg.extraConfig}
${forward}
'';
in
{
###### interface
options = {
services.unbound = {
enable = mkEnableOption "Unbound domain name server";
package = mkOption {
type = types.package;
default = pkgs.unbound-with-systemd;
defaultText = "pkgs.unbound-with-systemd";
description = "The unbound package to use";
};
allowedAccess = mkOption {
default = [ "127.0.0.0/24" ];
type = types.listOf types.str;
description = "What networks are allowed to use unbound as a resolver.";
};
interfaces = mkOption {
default = [ "127.0.0.1" ] ++ optional config.networking.enableIPv6 "::1";
type = types.listOf types.str;
description = ''
What addresses the server should listen on. This supports the interface syntax documented in
<citerefentry><refentrytitle>unbound.conf</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
'';
};
forwardAddresses = mkOption {
default = [];
type = types.listOf types.str;
description = "What servers to forward queries to.";
};
enableRootTrustAnchor = mkOption {
default = true;
type = types.bool;
description = "Use and update root trust anchor for DNSSEC validation.";
};
localControlSocketPath = mkOption {
default = null;
# FIXME: What is the proper type here so users can specify strings,
# paths and null?
# My guess would be `types.nullOr (types.either types.str types.path)`
# but I haven't verified yet.
type = types.nullOr types.str;
example = "/run/unbound/unbound.ctl";
description = ''
When not set to <literal>null</literal> this option defines the path
at which the unbound remote control socket should be created at. The
socket will be owned by the unbound user (<literal>unbound</literal>)
and group will be <literal>nogroup</literal>.
Users that should be permitted to access the socket must be in the
<literal>unbound</literal> group.
If this option is <literal>null</literal> remote control will not be
configured at all. Unbounds default values apply.
'';
};
extraConfig = mkOption {
default = "";
type = types.lines;
description = ''
Extra unbound config. See
<citerefentry><refentrytitle>unbound.conf</refentrytitle><manvolnum>8
</manvolnum></citerefentry>.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
users.users.unbound = {
description = "unbound daemon user";
isSystemUser = true;
group = lib.mkIf (cfg.localControlSocketPath != null) (lib.mkDefault "unbound");
};
# We need a group so that we can give users access to the configured
# control socket. Unbound allows access to the socket only to the unbound
# user and the primary group.
users.groups = lib.mkIf (cfg.localControlSocketPath != null) {
unbound = {};
};
networking.resolvconf.useLocalResolver = mkDefault true;
environment.etc."unbound/unbound.conf".source = confFile;
systemd.services.unbound = {
description = "Unbound recursive Domain Name Server";
after = [ "network.target" ];
before = [ "nss-lookup.target" ];
wantedBy = [ "multi-user.target" "nss-lookup.target" ];
preStart = lib.mkIf cfg.enableRootTrustAnchor ''
${cfg.package}/bin/unbound-anchor -a ${rootTrustAnchorFile} || echo "Root anchor updated!"
'';
restartTriggers = [
confFile
];
serviceConfig = {
ExecStart = "${cfg.package}/bin/unbound -p -d -c /etc/unbound/unbound.conf";
ExecReload = "+/run/current-system/sw/bin/kill -HUP $MAINPID";
NotifyAccess = "main";
Type = "notify";
# FIXME: Which of these do we actualy need, can we drop the chroot flag?
AmbientCapabilities = [
"CAP_NET_BIND_SERVICE"
"CAP_NET_RAW"
"CAP_SETGID"
"CAP_SETUID"
"CAP_SYS_CHROOT"
"CAP_SYS_RESOURCE"
];
User = "unbound";
Group = lib.mkIf (cfg.localControlSocketPath != null) (lib.mkDefault "unbound");
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateTmp = true;
ProtectHome = true;
ProtectControlGroups = true;
ProtectKernelModules = true;
ProtectSystem = "strict";
RuntimeDirectory = "unbound";
ConfigurationDirectory = "unbound";
StateDirectory = "unbound";
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
RestrictRealtime = true;
SystemCallArchitectures = "native";
SystemCallFilter = [
"~@clock"
"@cpu-emulation"
"@debug"
"@keyring"
"@module"
"mount"
"@obsolete"
"@resources"
];
RestrictNamespaces = true;
LockPersonality = true;
RestrictSUIDSGID = true;
};
};
# If networkmanager is enabled, ask it to interface with unbound.
networking.networkmanager.dns = "unbound";
};
}
|
