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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.bind;
bindPkg = config.services.bind.package;
bindUser = "named";
bindZoneCoerce = list: builtins.listToAttrs (lib.forEach list (zone: { name = zone.name; value = zone; }));
bindZoneOptions = { name, config, ... }: {
options = {
name = mkOption {
type = types.str;
default = name;
description = "Name of the zone.";
};
master = mkOption {
description = "Master=false means slave server";
type = types.bool;
};
file = mkOption {
type = types.either types.str types.path;
description = "Zone file resource records contain columns of data, separated by whitespace, that define the record.";
};
masters = mkOption {
type = types.listOf types.str;
description = "List of servers for inclusion in stub and secondary zones.";
};
slaves = mkOption {
type = types.listOf types.str;
description = "Addresses who may request zone transfers.";
default = [ ];
};
extraConfig = mkOption {
type = types.str;
description = "Extra zone config to be appended at the end of the zone section.";
default = "";
};
};
};
confFile = pkgs.writeText "named.conf"
''
include "/etc/bind/rndc.key";
controls {
inet 127.0.0.1 allow {localhost;} keys {"rndc-key";};
};
acl cachenetworks { ${concatMapStrings (entry: " ${entry}; ") cfg.cacheNetworks} };
acl badnetworks { ${concatMapStrings (entry: " ${entry}; ") cfg.blockedNetworks} };
options {
listen-on { ${concatMapStrings (entry: " ${entry}; ") cfg.listenOn} };
listen-on-v6 { ${concatMapStrings (entry: " ${entry}; ") cfg.listenOnIpv6} };
allow-query { cachenetworks; };
blackhole { badnetworks; };
forward ${cfg.forward};
forwarders { ${concatMapStrings (entry: " ${entry}; ") cfg.forwarders} };
directory "${cfg.directory}";
pid-file "/run/named/named.pid";
${cfg.extraOptions}
};
${cfg.extraConfig}
${ concatMapStrings
({ name, file, master ? true, slaves ? [], masters ? [], extraConfig ? "" }:
''
zone "${name}" {
type ${if master then "master" else "slave"};
file "${file}";
${ if master then
''
allow-transfer {
${concatMapStrings (ip: "${ip};\n") slaves}
};
''
else
''
masters {
${concatMapStrings (ip: "${ip};\n") masters}
};
''
}
allow-query { any; };
${extraConfig}
};
'')
(attrValues cfg.zones) }
'';
in
{
###### interface
options = {
services.bind = {
enable = mkEnableOption "BIND domain name server";
package = mkOption {
type = types.package;
default = pkgs.bind;
defaultText = literalExpression "pkgs.bind";
description = "The BIND package to use.";
};
cacheNetworks = mkOption {
default = [ "127.0.0.0/24" ];
type = types.listOf types.str;
description = "
What networks are allowed to use us as a resolver. Note
that this is for recursive queries -- all networks are
allowed to query zones configured with the `zones` option.
It is recommended that you limit cacheNetworks to avoid your
server being used for DNS amplification attacks.
";
};
blockedNetworks = mkOption {
default = [ ];
type = types.listOf types.str;
description = "
What networks are just blocked.
";
};
ipv4Only = mkOption {
default = false;
type = types.bool;
description = "
Only use ipv4, even if the host supports ipv6.
";
};
forwarders = mkOption {
default = config.networking.nameservers;
defaultText = literalExpression "config.networking.nameservers";
type = types.listOf types.str;
description = "
List of servers we should forward requests to.
";
};
forward = mkOption {
default = "first";
type = types.enum ["first" "only"];
description = "
Whether to forward 'first' (try forwarding but lookup directly if forwarding fails) or 'only'.
";
};
listenOn = mkOption {
default = [ "any" ];
type = types.listOf types.str;
description = "
Interfaces to listen on.
";
};
listenOnIpv6 = mkOption {
default = [ "any" ];
type = types.listOf types.str;
description = "
Ipv6 interfaces to listen on.
";
};
directory = mkOption {
type = types.str;
default = "/run/named";
description = "Working directory of BIND.";
};
zones = mkOption {
default = [ ];
type = with types; coercedTo (listOf attrs) bindZoneCoerce (attrsOf (types.submodule bindZoneOptions));
description = "
List of zones we claim authority over.
";
example = {
"example.com" = {
master = false;
file = "/var/dns/example.com";
masters = [ "192.168.0.1" ];
slaves = [ ];
extraConfig = "";
};
};
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = "
Extra lines to be added verbatim to the generated named configuration file.
";
};
extraOptions = mkOption {
type = types.lines;
default = "";
description = ''
Extra lines to be added verbatim to the options section of the
generated named configuration file.
'';
};
configFile = mkOption {
type = types.path;
default = confFile;
defaultText = literalExpression "confFile";
description = "
Overridable config file to use for named. By default, that
generated by nixos.
";
};
};
};
###### implementation
config = mkIf cfg.enable {
networking.resolvconf.useLocalResolver = mkDefault true;
users.users.${bindUser} =
{
group = bindUser;
description = "BIND daemon user";
isSystemUser = true;
};
users.groups.${bindUser} = {};
systemd.services.bind = {
description = "BIND Domain Name Server";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
preStart = ''
mkdir -m 0755 -p /etc/bind
if ! [ -f "/etc/bind/rndc.key" ]; then
${bindPkg.out}/sbin/rndc-confgen -c /etc/bind/rndc.key -u ${bindUser} -a -A hmac-sha256 2>/dev/null
fi
${pkgs.coreutils}/bin/mkdir -p /run/named
chown ${bindUser} /run/named
${pkgs.coreutils}/bin/mkdir -p ${cfg.directory}
chown ${bindUser} ${cfg.directory}
'';
serviceConfig = {
ExecStart = "${bindPkg.out}/sbin/named -u ${bindUser} ${optionalString cfg.ipv4Only "-4"} -c ${cfg.configFile} -f";
ExecReload = "${bindPkg.out}/sbin/rndc -k '/etc/bind/rndc.key' reload";
ExecStop = "${bindPkg.out}/sbin/rndc -k '/etc/bind/rndc.key' stop";
};
unitConfig.Documentation = "man:named(8)";
};
};
}
|