nixpkgs/nixos/modules/services/security/infnoise.nix
2022-05-27 15:18:43 -07:00

61 lines
1.7 KiB
Nix

{ 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;
};
};
};
}