| // Copyright 2004 The Bazel Authors. All Rights Reserved. |
| // |
| // 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.google.testing.junit.runner.util; |
| |
| import java.security.Permission; |
| |
| /** |
| * A security manager that prevents things that are dangerous or |
| * bad in a testing environment. Currently prevents System.exit() and |
| * System.setSecurityManager(). |
| * |
| * <p>For simplicity this is a Java 1.1 style security manager, ignoring |
| * the whole Permissions framework. This should be fine unless you |
| * are testing code that itself manipulates SecurityManagers. |
| */ |
| public final class GoogleTestSecurityManager extends SecurityManager { |
| private volatile boolean enabled = true; |
| |
| /** Prevent System.exit() from ever being called. */ |
| @Override public void checkExit(int code) { |
| if (enabled) { |
| throw new SecurityException("Test code should never call System.exit()"); |
| } |
| } |
| |
| // |
| // The code below overrides the Java2 security mechanism to allow |
| // (almost) all requests. This is OK vis-a-vis the Java default |
| // (which is to run with no security policy at all). |
| // |
| // The default Java security policy is to pass through to the |
| // Permissions check mechanism, which in turn by default denies |
| // things. We override all of that (in essence, disabling Java2 |
| // Permissions) and just allow everything. |
| // |
| |
| /** |
| * Cache a copy of the permission that System.setSecurityManager() checks. |
| */ |
| private final RuntimePermission securityManagerPermission = |
| new RuntimePermission("setSecurityManager"); |
| |
| /** Allow everything but creation of security managers. */ |
| @Override public void checkPermission(Permission p) { |
| if (enabled && securityManagerPermission.equals(p)) { |
| throw new SecurityException("GoogleTestSecurityManager is not designed to handle other " + |
| "security managers."); |
| } |
| } |
| |
| /** Allow everything. */ |
| @Override public void checkPermission(Permission p, java.lang.Object o) { |
| return; |
| } |
| |
| public boolean isEnabled() { return enabled; } |
| |
| /** |
| * If {@code GoogleTestSecurityManager} is the current security manager, |
| * uninstall it. |
| */ |
| public static void uninstallIfInstalled() { |
| SecurityManager securityManager = System.getSecurityManager(); |
| if (securityManager instanceof GoogleTestSecurityManager) { |
| GoogleTestSecurityManager testSecurityManager = (GoogleTestSecurityManager) securityManager; |
| boolean wasEnabled = testSecurityManager.isEnabled(); |
| |
| try { |
| testSecurityManager.setEnabled(false); |
| System.setSecurityManager(null); |
| } finally { |
| testSecurityManager.setEnabled(wasEnabled); |
| } |
| } |
| } |
| |
| /** |
| * The security manager can be disabled by the test runner (or any other |
| * class in the same package) to allow it to exit with a meaningful result |
| * code. |
| * |
| * VisibleForTesting |
| */ |
| synchronized void setEnabled(boolean enabled) { this.enabled = enabled; } |
| } |