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nixos/chrony: systemd service hardening #104944

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nixos/chrony: systemd service hardening #104944

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30 changes: 28 additions & 2 deletions nixos/modules/services/networking/ntp/chrony.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ with lib;
let
cfg = config.services.chrony;

runDir = "/var/run/chrony";
stateDir = "/var/lib/chrony";
driftFile = "${stateDir}/chrony.drift";
keyFile = "${stateDir}/chrony.keys";
Expand Down Expand Up @@ -116,9 +117,34 @@ in
{ Type = "simple";
ExecStart = "${pkgs.chrony}/bin/chronyd ${chronyFlags}";

ProtectHome = "yes";
ProtectSystem = "full";
KeyringMode = "private";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateMounts = "yes";
PrivateTmp = "yes";
ProtectControlGroups = true;
ProtectHome = "yes";
ProtectHostname = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectSystem = "strict";
ReadWritePaths = [ runDir stateDir ];
RemoveIPC = true;
RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallFilter = "@system-service @clock";
SystemCallArchitectures = "native";

# even though in the default configuration chrony does not access the rtc clock,
# it may be configured to so so either with the 'rtcfile' configuration option
# or using the '-s' flag. so we make sure rtc devices can still be used by it.
# at the same time there is no need for chrony to access any other device types.
DeviceAllow = "char-rtc";
DevicePolicy = "closed";

};

};
Expand Down