77 lines
2.1 KiB
Nix
77 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.haveged;
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in
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{
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###### interface
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options = {
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services.haveged = {
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enable = mkEnableOption ''
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haveged entropy daemon, which refills /dev/random when low.
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NOTE: does nothing on kernels newer than 5.6.
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'';
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# source for the note https://github.com/jirka-h/haveged/issues/57
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refill_threshold = mkOption {
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type = types.int;
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default = 1024;
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description = ''
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The number of bits of available entropy beneath which
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haveged should refill the entropy pool.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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# https://github.com/jirka-h/haveged/blob/a4b69d65a8dfc5a9f52ff8505c7f58dcf8b9234f/contrib/Fedora/haveged.service
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systemd.services.haveged = {
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description = "Entropy Daemon based on the HAVEGE algorithm";
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unitConfig = {
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Documentation = "man:haveged(8)";
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DefaultDependencies = false;
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ConditionKernelVersion = "<5.6";
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};
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wantedBy = [ "sysinit.target" ];
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after = [ "systemd-tmpfiles-setup-dev.service" ];
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before = [ "sysinit.target" "shutdown.target" "systemd-journald.service" ];
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serviceConfig = {
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ExecStart = "${pkgs.haveged}/bin/haveged -w ${toString cfg.refill_threshold} --Foreground -v 1";
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Restart = "always";
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SuccessExitStatus = "137 143";
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SecureBits = "noroot-locked";
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CapabilityBoundingSet = [ "CAP_SYS_ADMIN" "CAP_SYS_CHROOT" ];
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# We can *not* set PrivateTmp=true as it can cause an ordering cycle.
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PrivateTmp = false;
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PrivateDevices = true;
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ProtectSystem = "full";
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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RestrictNamespaces = true;
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RestrictRealtime = true;
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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SystemCallArchitectures = "native";
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SystemCallFilter = [ "@system-service" "newuname" "~@mount" ];
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SystemCallErrorNumber = "EPERM";
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};
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};
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};
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}
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