nixpkgs/nixos/modules/security/rngd.nix

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{ config, lib, pkgs, ... }:
with lib;
{
options = {
security.rngd.enable = mkOption {
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type = types.bool;
default = true;
description = ''
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Whether to enable the rng daemon, which adds entropy from
hardware sources of randomness to the kernel entropy pool when
available.
'';
};
};
config = mkIf config.security.rngd.enable {
services.udev.extraRules = ''
KERNEL=="random", TAG+="systemd"
SUBSYSTEM=="cpu", ENV{MODALIAS}=="x86cpu:*feature:*009E*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
KERNEL=="hw_random", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
KERNEL=="tmp0", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
'';
systemd.services.rngd = {
bindsTo = [ "dev-random.device" ];
after = [ "dev-random.device" ];
description = "Hardware RNG Entropy Gatherer Daemon";
serviceConfig.ExecStart = "${pkgs.rng_tools}/sbin/rngd -f -v" +
(if config.services.tcsd.enable then " --no-tpm=1" else "");
restartTriggers = [ pkgs.rng_tools ];
};
};
}