1 files changed, 150 insertions, 0 deletions
diff --git a/nixos/modules/services/networking/ntp/ntpd.nix b/nixos/modules/services/networking/ntp/ntpd.nix
new file mode 100644
index 00000000000..12be0d045a8
--- /dev/null
+++ b/nixos/modules/services/networking/ntp/ntpd.nix
@@ -0,0 +1,150 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  inherit (pkgs) ntp;
+
+  cfg = config.services.ntp;
+
+  stateDir = "/var/lib/ntp";
+
+  configFile = pkgs.writeText "ntp.conf" ''
+    driftfile ${stateDir}/ntp.drift
+
+    restrict default ${toString cfg.restrictDefault}
+    restrict -6 default ${toString cfg.restrictDefault}
+    restrict source ${toString cfg.restrictSource}
+
+    restrict 127.0.0.1
+    restrict -6 ::1
+
+    ${toString (map (server: "server " + server + " iburst\n") cfg.servers)}
+
+    ${cfg.extraConfig}
+  '';
+
+  ntpFlags = "-c ${configFile} -u ntp:ntp ${toString cfg.extraFlags}";
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.ntp = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to synchronise your machine's time using ntpd, as a peer in
+          the NTP network.
+          </para>
+          <para>
+          Disables <literal>systemd.timesyncd</literal> if enabled.
+        '';
+      };
+
+      restrictDefault = mkOption {
+        type = types.listOf types.str;
+        description = ''
+          The restriction flags to be set by default.
+          </para>
+          <para>
+          The default flags prevent external hosts from using ntpd as a DDoS
+          reflector, setting system time, and querying OS/ntpd version. As
+          recommended in section 6.5.1.1.3, answer "No" of
+          http://support.ntp.org/bin/view/Support/AccessRestrictions
+        '';
+        default = [ "limited" "kod" "nomodify" "notrap" "noquery" "nopeer" ];
+      };
+
+      restrictSource = mkOption {
+        type = types.listOf types.str;
+        description = ''
+          The restriction flags to be set on source.
+          </para>
+          <para>
+          The default flags allow peers to be added by ntpd from configured
+          pool(s), but not by other means.
+        '';
+        default = [ "limited" "kod" "nomodify" "notrap" "noquery" ];
+      };
+
+      servers = mkOption {
+        default = config.networking.timeServers;
+        defaultText = literalExpression "config.networking.timeServers";
+        type = types.listOf types.str;
+        description = ''
+          The set of NTP servers from which to synchronise.
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        example = ''
+          fudge 127.127.1.0 stratum 10
+        '';
+        description = ''
+          Additional text appended to <filename>ntp.conf</filename>.
+        '';
+      };
+
+      extraFlags = mkOption {
+        type = types.listOf types.str;
+        description = "Extra flags passed to the ntpd command.";
+        example = literalExpression ''[ "--interface=eth0" ]'';
+        default = [];
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.ntp.enable {
+    meta.maintainers = with lib.maintainers; [ thoughtpolice ];
+
+    # Make tools such as ntpq available in the system path.
+    environment.systemPackages = [ pkgs.ntp ];
+    services.timesyncd.enable = mkForce false;
+
+    systemd.services.systemd-timedated.environment = { SYSTEMD_TIMEDATED_NTP_SERVICES = "ntpd.service"; };
+
+    users.users.ntp =
+      { isSystemUser = true;
+        group = "ntp";
+        description = "NTP daemon user";
+        home = stateDir;
+      };
+    users.groups.ntp = {};
+
+    systemd.services.ntpd =
+      { description = "NTP Daemon";
+
+        wantedBy = [ "multi-user.target" ];
+        wants = [ "time-sync.target" ];
+        before = [ "time-sync.target" ];
+
+        preStart =
+          ''
+            mkdir -m 0755 -p ${stateDir}
+            chown ntp ${stateDir}
+          '';
+
+        serviceConfig = {
+          ExecStart = "@${ntp}/bin/ntpd ntpd -g ${ntpFlags}";
+          Type = "forking";
+        };
+      };
+
+  };
+
+}