clightning: harden

modules/services/clightning.nix

@@ -154,7 +154,33 @@ in
         User = cfg.user;
         Restart = "on-failure";
         RestartSec = "30s";
+
         ReadWritePaths = [ cfg.dataDir ];
+
+        # hardening
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        ProtectSystem = "strict";
+        RemoveIPC = true;
+        RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6";
+        RestrictNamespaces = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [ "@system-service" "~@privileged" "~@resources" ];
       };
 
       preStart = ''