1 files changed, 67 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/security/haveged.nix b/nixpkgs/nixos/modules/services/security/haveged.nix
new file mode 100644
index 000000000000..eca529188810
--- /dev/null
+++ b/nixpkgs/nixos/modules/services/security/haveged.nix
@@ -0,0 +1,67 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.haveged;
+
+in
+
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.haveged = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable to haveged entropy daemon, which refills 
+          /dev/random when low.
+        '';
+      };
+      
+      refill_threshold = mkOption {
+        type = types.int;
+        default = 1024;
+        description = ''
+          The number of bits of available entropy beneath which
+          haveged should refill the entropy pool.
+        '';
+      };
+      
+    };
+    
+  };
+  
+  
+  ###### implementation
+  
+  config = mkIf cfg.enable {
+  
+    systemd.services.haveged =
+      { description = "Entropy Harvesting Daemon";
+        unitConfig.Documentation = "man:haveged(8)";
+        wantedBy = [ "multi-user.target" ];
+
+        path = [ pkgs.haveged ];
+
+        serviceConfig = {
+          ExecStart = "${pkgs.haveged}/bin/haveged -F -w ${toString cfg.refill_threshold} -v 1";
+          SuccessExitStatus = 143;
+          PrivateTmp = true;
+          PrivateDevices = true;
+          PrivateNetwork = true;
+          ProtectSystem = "full";
+          ProtectHome = true;
+        };
+      };
+
+  };
+  
+}