1 files changed, 60 insertions, 0 deletions
diff --git a/nixos/modules/services/security/infnoise.nix b/nixos/modules/services/security/infnoise.nix
new file mode 100644
index 0000000000000..4fb8adaf33f89
--- /dev/null
+++ b/nixos/modules/services/security/infnoise.nix
@@ -0,0 +1,60 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.infnoise;
+in {
+  options = {
+    services.infnoise = {
+      enable = mkEnableOption "the Infinite Noise TRNG driver";
+
+      fillDevRandom = mkOption {
+        description = ''
+          Whether to run the infnoise driver as a daemon to refill /dev/random.
+
+          If disabled, you can use the `infnoise` command-line tool to
+          manually obtain randomness.
+        '';
+        type = types.bool;
+        default = true;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.infnoise ];
+
+    services.udev.extraRules = ''
+      SUBSYSTEM=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", SYMLINK+="infnoise", TAG+="systemd", GROUP="dialout", MODE="0664", ENV{SYSTEMD_WANTS}="infnoise.service"
+    '';
+
+    systemd.services.infnoise = mkIf cfg.fillDevRandom {
+      description = "Infinite Noise TRNG driver";
+
+      bindsTo = [ "dev-infnoise.device" ];
+      after = [ "dev-infnoise.device" ];
+
+      serviceConfig = {
+        ExecStart = "${pkgs.infnoise}/bin/infnoise --dev-random --debug";
+        Restart = "always";
+        User = "infnoise";
+        DynamicUser = true;
+        SupplementaryGroups = [ "dialout" ];
+        DeviceAllow = [ "/dev/infnoise" ];
+        DevicePolicy = "closed";
+        PrivateNetwork = true;
+        ProtectSystem = "strict";
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true; # only reads entropy pool size and watermark
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+      };
+    };
+  };
+}