| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| import java.security.AccessController; |
| import java.security.Permission; |
| import java.security.Policy; |
| import java.security.PrivilegedAction; |
| import java.security.ProtectionDomain; |
| |
| public class CustomPolicy extends Policy { |
| |
| // the ProtectionDomain of CustomPolicy |
| private final ProtectionDomain policyPd; |
| |
| public CustomPolicy() { |
| policyPd = AccessController.doPrivileged( |
| (PrivilegedAction<ProtectionDomain>) |
| () -> this.getClass().getProtectionDomain()); |
| } |
| |
| @Override |
| public boolean implies(ProtectionDomain pd, Permission perm) { |
| System.out.println("CustomPolicy.implies"); |
| |
| // If the protection domain is the same as CustomPolicy, then |
| // we return true. This is to prevent recursive permission checks |
| // that lead to StackOverflow errors when the policy implementation |
| // performs a sensitive operation that triggers a permission check, |
| // for example, as below. |
| if (pd == policyPd) { |
| return true; |
| } |
| |
| // Do something that triggers a permission check to make sure that |
| // we don't cause a StackOverflow error. |
| String home = AccessController.doPrivileged( |
| (PrivilegedAction<String>) () -> System.getProperty("user.home")); |
| |
| return true; |
| } |
| } |