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|
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.bind;
bindUser = "named";
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 first;
forwarders { ${concatMapStrings (entry: " ${entry}; ") cfg.forwarders} };
directory "/run/named";
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}
};
'')
cfg.zones }
'';
in
{
###### interface
options = {
services.bind = {
enable = mkEnableOption "BIND domain name server";
cacheNetworks = mkOption {
default = ["127.0.0.0/24"];
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 = [];
description = "
What networks are just blocked.
";
};
ipv4Only = mkOption {
default = false;
description = "
Only use ipv4, even if the host supports ipv6.
";
};
forwarders = mkOption {
default = config.networking.nameservers;
description = "
List of servers we should forward requests to.
";
};
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.
";
};
zones = mkOption {
default = [];
description = "
List of zones we claim authority over.
master=false means slave server; slaves means addresses
who may request zone transfer.
";
example = [{
name = "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 = "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} =
{ uid = config.ids.uids.bind;
description = "BIND daemon user";
};
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
${pkgs.bind.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 ${bindUser} /run/named
'';
serviceConfig = {
ExecStart = "${pkgs.bind.out}/sbin/named -u ${bindUser} ${optionalString cfg.ipv4Only "-4"} -c ${cfg.configFile} -f";
ExecReload = "${pkgs.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' reload";
ExecStop = "${pkgs.bind.out}/sbin/rndc -k '/etc/bind/rndc.key' stop";
};
unitConfig.Documentation = "man:named(8)";
};
};
}
|