265 lines
7.8 KiB
Nix
265 lines
7.8 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.fudo.backplane.dns;
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powerdns-conf-dir = "${cfg.powerdns.home}/conf.d";
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backplaneOpts = { ... }: {
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options = {
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host = mkOption {
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type = types.str;
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description = "Hostname of the backplane jabber server.";
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};
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role = mkOption {
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type = types.str;
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description = "Backplane XMPP role name for the DNS server.";
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default = "service-dns";
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};
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password-file = mkOption {
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type = types.str;
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description = "File containing XMPP password for backplane role.";
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};
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database = mkOption {
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type = with types; submodule databaseOpts;
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description = "Database settings for backplane server.";
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};
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cl-wrapper-package = mkOption {
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type = types.package;
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description = "Common Lisp wrapper package to use.";
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default = pkgs.lispPackages.clwrapper;
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};
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};
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};
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databaseOpts = { ... }: {
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options = {
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host = mkOption {
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type = types.str;
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description = "Hostname or IP of the PostgreSQL server.";
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};
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database = mkOption {
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type = types.str;
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description = "Database to use for DNS backplane.";
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default = "backplane_dns";
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};
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username = mkOption {
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type = types.str;
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description = "Database user for DNS backplane.";
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default = "backplane_dns";
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};
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password-file = mkOption {
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type = types.str;
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description = "File containing password for database user.";
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};
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};
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};
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in {
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options.fudo.backplane.dns = with types; {
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enable = mkEnableOption "Enable backplane dynamic DNS server.";
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port = mkOption {
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type = port;
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description = "Port on which to serve authoritative DNS requests.";
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default = 53;
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};
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listen-v4-addresses = mkOption {
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type = listOf str;
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description = "IPv4 addresses on which to listen for dns requests.";
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default = [ "0.0.0.0" ];
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};
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listen-v6-addresses = mkOption {
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type = listOf str;
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description = "IPv6 addresses on which to listen for dns requests.";
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example = [ "[abcd::1]" ];
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default = [ ];
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};
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required-services = mkOption {
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type = listOf str;
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description =
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"A list of services required before the DNS server can start.";
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default = [ ];
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};
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user = mkOption {
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type = str;
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description = "User as which to run DNS backplane listener service.";
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default = "backplane-dns";
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};
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group = mkOption {
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type = str;
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description = "Group as which to run DNS backplane listener service.";
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default = "backplane-dns";
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};
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database = mkOption {
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type = submodule databaseOpts;
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description = "Database settings for the DNS server.";
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};
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backplane = mkOption {
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type = submodule backplaneOpts;
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description = "Backplane Jabber settings for the DNS server.";
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};
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powerdns = {
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home = mkOption {
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type = str;
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description = "Directory at which to store powerdns configuration and state.";
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default = "/run/backplane-dns/powerdns";
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};
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user = mkOption {
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type = str;
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description = "Username as which to run PowerDNS.";
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default = "backplane-powerdns";
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};
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};
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};
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config = mkIf cfg.enable {
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users = {
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users = {
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"${cfg.user}" = {
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isSystemUser = true;
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group = cfg.group;
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createHome = true;
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home = "/var/home/${cfg.user}";
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};
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${cfg.powerdns.user} = {
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isSystemUser = true;
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home = cfg.powerdns.home;
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createHome = true;
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};
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};
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groups = {
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"${cfg.group}" = { members = [ cfg.user ]; };
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${cfg.powerdns.user} = { members = [ cfg.powerdns.user ]; };
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};
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};
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fudo.system.services = {
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backplane-powerdns-config-generator = {
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description =
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"Generate postgres configuration for backplane DNS server.";
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requires = cfg.required-services;
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type = "oneshot";
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restartIfChanged = true;
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partOf = [ "backplane-dns.target" ];
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readWritePaths = [ powerdns-conf-dir ];
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preStart = ''
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mkdir -p ${powerdns-conf-dir}
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chown ${cfg.powerdns.user}:${cfg.powerdns.user} ${powerdns-conf-dir}
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'';
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# This builds the config in a bash script, to avoid storing the password
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# in the nix store at any point
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script = ''
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if [ ! -d ${powerdns-conf-dir} ]; then
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mkdir ${powerdns-conf-dir}
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fi
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TMPDIR=$(${pkgs.coreutils}/bin/mktemp -d -t pdns-XXXXXXXXXX)
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TMPCONF=$TMPDIR/pdns.local.gpgsql.conf
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if [ ! -f ${cfg.database.password-file} ]; then
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echo "${cfg.database.password-file} does not exist!"
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exit 1
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fi
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touch $TMPCONF
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chown ${cfg.powerdns.user}:${cfg.powerdns.user} $TMPCONF
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chmod go-rwx $TMPCONF
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PASSWORD=$(cat ${cfg.database.password-file})
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echo "launch+=gpgsql" >> $TMPCONF
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echo "gpgsql-host=${cfg.database.host}" >> $TMPCONF
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echo "gpgsql-dbname=${cfg.database.database}" >> $TMPCONF
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echo "gpgsql-user=${cfg.database.username}" >> $TMPCONF
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echo "gpgsql-password=$PASSWORD" >> $TMPCONF
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echo "gpgsql-dnssec=yes" >> $TMPCONF
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mv $TMPCONF ${powerdns-conf-dir}/pdns.local.gpgsql.conf
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rm -rf $TMPDIR
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exit 0
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'';
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};
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backplane-dns = {
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description = "Fudo DNS Backplane Server";
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restartIfChanged = true;
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path = with pkgs; [ backplane-dns-server ];
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execStart = "launch-backplane-dns.sh";
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pidFile = "/run/backplane-dns.$USERNAME.pid";
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user = cfg.user;
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group = cfg.group;
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partOf = [ "backplane-dns.target" ];
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requires = cfg.required-services ++ [ "postgresql.service" ];
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environment = {
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FUDO_DNS_BACKPLANE_XMPP_HOSTNAME = cfg.backplane.host;
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FUDO_DNS_BACKPLANE_XMPP_USERNAME = cfg.backplane.role;
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FUDO_DNS_BACKPLANE_XMPP_PASSWORD_FILE = cfg.backplane.password-file;
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FUDO_DNS_BACKPLANE_DATABASE_HOSTNAME = cfg.backplane.database.host;
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FUDO_DNS_BACKPLANE_DATABASE_NAME = cfg.backplane.database.database;
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FUDO_DNS_BACKPLANE_DATABASE_USERNAME =
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cfg.backplane.database.username;
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FUDO_DNS_BACKPLANE_DATABASE_PASSWORD_FILE =
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cfg.backplane.database.password-file;
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CL_SOURCE_REGISTRY =
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pkgs.lib.fudo.lisp.lisp-source-registry pkgs.backplane-dns-server;
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};
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};
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};
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systemd = {
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targets = {
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backplane-dns = {
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description = "Fudo DNS backplane services.";
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wantedBy = [ "multi-user.target" ];
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after = cfg.required-services ++ [ "postgresql.service" ];
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};
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};
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services = {
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backplane-powerdns = let
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pdns-config-dir = pkgs.writeTextDir "pdns.conf" ''
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local-address=${lib.concatStringsSep ", " cfg.listen-v4-addresses}
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local-ipv6=${lib.concatStringsSep ", " cfg.listen-v6-addresses}
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local-port=${toString cfg.port}
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launch=
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include-dir=${powerdns-conf-dir}/
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'';
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in {
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description = "Backplane PowerDNS name server";
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requires = [
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"postgresql.service"
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"backplane-powerdns-config-generator.service"
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];
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after = [ "network.target" ];
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path = with pkgs; [ powerdns postgresql ];
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serviceConfig = {
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ExecStart = "pdns_server --setuid=${cfg.powerdns.user} --setgid=${cfg.powerdns.user} --chroot=${cfg.powerdns.home} --socket-dir=/ --daemon=no --guardian=no --disable-syslog --write-pid=no --config-dir=${pdns-config-dir}";
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};
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};
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};
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};
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};
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}
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