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/*
* 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;
}
}
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