{ 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 = mkOption { default = false; description = " Whether to enable 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)"; }; }; }