| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.util; |
| |
| import static android.os.Binder.getCallingUid; |
| |
| import android.os.Process; |
| |
| /** |
| * Utility class to check calling permissions on the network stack. |
| */ |
| public final class PermissionUtil { |
| |
| /** |
| * Check that the caller is allowed to communicate with the network stack. |
| * @throws SecurityException The caller is not allowed to communicate with the network stack. |
| */ |
| public static void checkNetworkStackCallingPermission() { |
| // TODO: check that the calling PID is the system server. |
| if (getCallingUid() != Process.SYSTEM_UID && getCallingUid() != Process.ROOT_UID) { |
| throw new SecurityException("Invalid caller: " + getCallingUid()); |
| } |
| } |
| |
| private PermissionUtil() { |
| throw new UnsupportedOperationException("This class is not to be instantiated"); |
| } |
| } |