diff options
Diffstat (limited to 'nixos/modules/security/rngd.nix')
-rw-r--r-- | nixos/modules/security/rngd.nix | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/nixos/modules/security/rngd.nix b/nixos/modules/security/rngd.nix new file mode 100644 index 000000000000..720ac02f2e81 --- /dev/null +++ b/nixos/modules/security/rngd.nix @@ -0,0 +1,38 @@ +{ config, pkgs, ... }: + +with pkgs.lib; + +{ + options = { + security.rngd.enable = mkOption { + type = types.bool; + default = true; + description = '' + 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"; + + restartTriggers = [ pkgs.rng_tools ]; + }; + }; +} |