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