author | alanb |
Mon, 01 Oct 2012 15:36:57 +0100 | |
changeset 14014 | da3648e13e67 |
parent 10336 | 0bb1999251f8 |
child 14342 | 8435a30053c1 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
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diff
changeset
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* Copyright (c) 1999, 2011, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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package javax.crypto; |
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import java.security.*; |
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import java.security.spec.AlgorithmParameterSpec; |
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import java.io.Serializable; |
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import java.util.Enumeration; |
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import java.util.Vector; |
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import javax.crypto.spec.*; |
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/** |
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* The CryptoPermission class extends the |
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* java.security.Permission class. A |
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* CryptoPermission object is used to represent |
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* the ability of an application/applet to use certain |
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* algorithms with certain key sizes and other |
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* restrictions in certain environments. <p> |
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* |
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* @see java.security.Permission |
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* |
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* @author Jan Luehe |
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* @author Sharon Liu |
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* @since 1.4 |
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*/ |
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class CryptoPermission extends java.security.Permission { |
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private static final long serialVersionUID = 8987399626114087514L; |
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private String alg; |
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private int maxKeySize = Integer.MAX_VALUE; // no restriction on maxKeySize |
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private String exemptionMechanism = null; |
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private AlgorithmParameterSpec algParamSpec = null; |
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private boolean checkParam = false; // no restriction on param |
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static final String ALG_NAME_WILDCARD = "*"; |
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/** |
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* Constructor that takes an algorithm name. |
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* |
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* This constructor implies that the given algorithm can be |
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* used without any restrictions. |
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* |
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* @param alg the algorithm name. |
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*/ |
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CryptoPermission(String alg) { |
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super(null); |
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this.alg = alg; |
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} |
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/** |
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* Constructor that takes an algorithm name and a maximum |
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* key size. |
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* |
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* This constructor implies that the given algorithm can be |
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* used with a key size up to <code>maxKeySize</code>. |
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* |
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* @param alg the algorithm name. |
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* |
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* @param maxKeySize the maximum allowable key size, |
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* specified in number of bits. |
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*/ |
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CryptoPermission(String alg, int maxKeySize) { |
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super(null); |
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this.alg = alg; |
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this.maxKeySize = maxKeySize; |
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} |
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/** |
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* Constructor that takes an algorithm name, a maximum |
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* key size, and an AlgorithmParameterSpec object. |
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* |
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* This constructor implies that the given algorithm can be |
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* used with a key size up to <code>maxKeySize</code>, and |
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* algorithm |
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* parameters up to the limits set in <code>algParamSpec</code>. |
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* |
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* @param alg the algorithm name. |
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* |
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* @param maxKeySize the maximum allowable key size, |
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* specified in number of bits. |
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* |
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* @param algParamSpec the limits for allowable algorithm |
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* parameters. |
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*/ |
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CryptoPermission(String alg, |
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int maxKeySize, |
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AlgorithmParameterSpec algParamSpec) { |
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super(null); |
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this.alg = alg; |
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this.maxKeySize = maxKeySize; |
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this.checkParam = true; |
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this.algParamSpec = algParamSpec; |
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} |
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/** |
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* Constructor that takes an algorithm name and the name of |
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* an exemption mechanism. |
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* |
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* This constructor implies that the given algorithm can be |
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* used without any key size or algorithm parameter restrictions |
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* provided that the specified exemption mechanism is enforced. |
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* |
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* @param alg the algorithm name. |
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* |
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* @param exemptionMechanism the name of the exemption mechanism. |
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*/ |
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CryptoPermission(String alg, |
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String exemptionMechanism) { |
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super(null); |
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this.alg = alg; |
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this.exemptionMechanism = exemptionMechanism; |
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} |
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/** |
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* Constructor that takes an algorithm name, a maximum key |
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* size, and the name of an exemption mechanism. |
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* |
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* This constructor implies that the given algorithm can be |
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* used with a key size up to <code>maxKeySize</code> |
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* provided that the |
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* specified exemption mechanism is enforced. |
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* |
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* @param alg the algorithm name. |
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* @param maxKeySize the maximum allowable key size, |
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* specified in number of bits. |
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* @param exemptionMechanism the name of the exemption |
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* mechanism. |
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*/ |
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CryptoPermission(String alg, |
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int maxKeySize, |
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String exemptionMechanism) { |
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super(null); |
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this.alg = alg; |
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this.exemptionMechanism = exemptionMechanism; |
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this.maxKeySize = maxKeySize; |
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} |
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/** |
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* Constructor that takes an algorithm name, a maximum key |
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* size, the name of an exemption mechanism, and an |
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* AlgorithmParameterSpec object. |
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* |
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* This constructor implies that the given algorithm can be |
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* used with a key size up to <code>maxKeySize</code> |
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* and algorithm |
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* parameters up to the limits set in <code>algParamSpec</code> |
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* provided that |
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* the specified exemption mechanism is enforced. |
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* |
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* @param alg the algorithm name. |
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* @param maxKeySize the maximum allowable key size, |
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* specified in number of bits. |
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* @param algParamSpec the limit for allowable algorithm |
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* parameter spec. |
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* @param exemptionMechanism the name of the exemption |
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* mechanism. |
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*/ |
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CryptoPermission(String alg, |
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int maxKeySize, |
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AlgorithmParameterSpec algParamSpec, |
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String exemptionMechanism) { |
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super(null); |
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this.alg = alg; |
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this.exemptionMechanism = exemptionMechanism; |
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this.maxKeySize = maxKeySize; |
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this.checkParam = true; |
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this.algParamSpec = algParamSpec; |
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} |
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/** |
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* Checks if the specified permission is "implied" by |
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* this object. |
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* <p> |
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* More specifically, this method returns true if:<p> |
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* <ul> |
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* <li> <i>p</i> is an instance of CryptoPermission, and<p> |
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* <li> <i>p</i>'s algorithm name equals or (in the case of wildcards) |
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* is implied by this permission's algorithm name, and<p> |
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* <li> <i>p</i>'s maximum allowable key size is less or |
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* equal to this permission's maximum allowable key size, and<p> |
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* <li> <i>p</i>'s algorithm parameter spec equals or is |
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* implied by this permission's algorithm parameter spec, and<p> |
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* <li> <i>p</i>'s exemptionMechanism equals or |
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* is implied by this permission's |
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* exemptionMechanism (a <code>null</code> exemption mechanism |
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* implies any other exemption mechanism). |
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* </ul> |
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* |
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* @param p the permission to check against. |
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* |
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* @return true if the specified permission is equal to or |
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* implied by this permission, false otherwise. |
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*/ |
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public boolean implies(Permission p) { |
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if (!(p instanceof CryptoPermission)) |
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return false; |
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CryptoPermission cp = (CryptoPermission)p; |
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if ((!alg.equalsIgnoreCase(cp.alg)) && |
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(!alg.equalsIgnoreCase(ALG_NAME_WILDCARD))) { |
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return false; |
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} |
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// alg is the same as cp's alg or |
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// alg is a wildcard. |
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if (cp.maxKeySize <= this.maxKeySize) { |
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// check algParamSpec. |
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if (!impliesParameterSpec(cp.checkParam, cp.algParamSpec)) { |
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return false; |
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} |
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// check exemptionMechanism. |
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if (impliesExemptionMechanism(cp.exemptionMechanism)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Checks two CryptoPermission objects for equality. Checks that |
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* <code>obj</code> is a CryptoPermission, and has the same |
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* algorithm name, |
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* exemption mechanism name, maximum allowable key size and |
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* algorithm parameter spec |
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* as this object. |
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* <P> |
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* @param obj the object to test for equality with this object. |
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* @return true if <code>obj</code> is equal to this object. |
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*/ |
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public boolean equals(Object obj) { |
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if (obj == this) |
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return true; |
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if (!(obj instanceof CryptoPermission)) |
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return false; |
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CryptoPermission that = (CryptoPermission) obj; |
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if (!(alg.equalsIgnoreCase(that.alg)) || |
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(maxKeySize != that.maxKeySize)) { |
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return false; |
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} |
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if (this.checkParam != that.checkParam) { |
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return false; |
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} |
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return (equalObjects(this.exemptionMechanism, |
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that.exemptionMechanism) && |
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equalObjects(this.algParamSpec, |
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that.algParamSpec)); |
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} |
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/** |
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* Returns the hash code value for this object. |
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* |
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* @return a hash code value for this object. |
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*/ |
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public int hashCode() { |
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int retval = alg.hashCode(); |
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retval ^= maxKeySize; |
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if (exemptionMechanism != null) { |
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retval ^= exemptionMechanism.hashCode(); |
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} |
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if (checkParam) retval ^= 100; |
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if (algParamSpec != null) { |
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retval ^= algParamSpec.hashCode(); |
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} |
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return retval; |
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} |
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/** |
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* There is no action defined for a CryptoPermission |
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* onject. |
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*/ |
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public String getActions() |
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{ |
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return null; |
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} |
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/** |
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* Returns a new PermissionCollection object for storing |
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* CryptoPermission objects. |
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* |
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* @return a new PermissionCollection object suitable for storing |
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* CryptoPermissions. |
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*/ |
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public PermissionCollection newPermissionCollection() { |
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return new CryptoPermissionCollection(); |
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} |
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/** |
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* Returns the algorithm name associated with |
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* this CryptoPermission object. |
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*/ |
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final String getAlgorithm() { |
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return alg; |
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} |
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/** |
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* Returns the exemption mechanism name |
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* associated with this CryptoPermission |
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* object. |
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*/ |
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final String getExemptionMechanism() { |
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return exemptionMechanism; |
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} |
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||
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/** |
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* Returns the maximum allowable key size associated |
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339 |
* with this CryptoPermission object. |
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*/ |
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341 |
final int getMaxKeySize() { |
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return maxKeySize; |
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} |
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344 |
||
345 |
/** |
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346 |
* Returns true if there is a limitation on the |
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347 |
* AlgorithmParameterSpec associated with this |
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* CryptoPermission object and false if otherwise. |
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*/ |
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350 |
final boolean getCheckParam() { |
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351 |
return checkParam; |
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} |
|
353 |
||
354 |
/** |
|
355 |
* Returns the AlgorithmParameterSpec |
|
356 |
* associated with this CryptoPermission |
|
357 |
* object. |
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358 |
*/ |
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359 |
final AlgorithmParameterSpec getAlgorithmParameterSpec() { |
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360 |
return algParamSpec; |
|
361 |
} |
|
362 |
||
363 |
/** |
|
364 |
* Returns a string describing this CryptoPermission. The convention is to |
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365 |
* specify the class name, the algorithm name, the maximum allowable |
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366 |
* key size, and the name of the exemption mechanism, in the following |
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367 |
* format: '("ClassName" "algorithm" "keysize" "exemption_mechanism")'. |
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368 |
* |
|
369 |
* @return information about this CryptoPermission. |
|
370 |
*/ |
|
371 |
public String toString() { |
|
372 |
StringBuilder buf = new StringBuilder(100); |
|
373 |
buf.append("(CryptoPermission " + alg + " " + maxKeySize); |
|
374 |
if (algParamSpec != null) { |
|
375 |
if (algParamSpec instanceof RC2ParameterSpec) { |
|
376 |
buf.append(" , effective " + |
|
377 |
((RC2ParameterSpec)algParamSpec).getEffectiveKeyBits()); |
|
378 |
} else if (algParamSpec instanceof RC5ParameterSpec) { |
|
379 |
buf.append(" , rounds " + |
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380 |
((RC5ParameterSpec)algParamSpec).getRounds()); |
|
381 |
} |
|
382 |
} |
|
383 |
if (exemptionMechanism != null) { // OPTIONAL |
|
384 |
buf.append(" " + exemptionMechanism); |
|
385 |
} |
|
386 |
buf.append(")"); |
|
387 |
return buf.toString(); |
|
388 |
} |
|
389 |
||
390 |
private boolean impliesExemptionMechanism(String exemptionMechanism) { |
|
391 |
if (this.exemptionMechanism == null) { |
|
392 |
return true; |
|
393 |
} |
|
394 |
||
395 |
if (exemptionMechanism == null) { |
|
396 |
return false; |
|
397 |
} |
|
398 |
||
399 |
if (this.exemptionMechanism.equals(exemptionMechanism)) { |
|
400 |
return true; |
|
401 |
} |
|
402 |
||
403 |
return false; |
|
404 |
} |
|
405 |
||
406 |
private boolean impliesParameterSpec(boolean checkParam, |
|
407 |
AlgorithmParameterSpec algParamSpec) { |
|
408 |
if ((this.checkParam) && checkParam) { |
|
409 |
if (algParamSpec == null) { |
|
410 |
return true; |
|
411 |
} else if (this.algParamSpec == null) { |
|
412 |
return false; |
|
413 |
} |
|
414 |
||
415 |
if (this.algParamSpec.getClass() != algParamSpec.getClass()) { |
|
416 |
return false; |
|
417 |
} |
|
418 |
||
419 |
if (algParamSpec instanceof RC2ParameterSpec) { |
|
420 |
if (((RC2ParameterSpec)algParamSpec).getEffectiveKeyBits() <= |
|
421 |
((RC2ParameterSpec) |
|
422 |
(this.algParamSpec)).getEffectiveKeyBits()) { |
|
423 |
return true; |
|
424 |
} |
|
425 |
} |
|
426 |
||
427 |
if (algParamSpec instanceof RC5ParameterSpec) { |
|
428 |
if (((RC5ParameterSpec)algParamSpec).getRounds() <= |
|
429 |
((RC5ParameterSpec)this.algParamSpec).getRounds()) { |
|
430 |
return true; |
|
431 |
} |
|
432 |
} |
|
433 |
||
434 |
if (algParamSpec instanceof PBEParameterSpec) { |
|
435 |
if (((PBEParameterSpec)algParamSpec).getIterationCount() <= |
|
436 |
((PBEParameterSpec)this.algParamSpec).getIterationCount()) { |
|
437 |
return true; |
|
438 |
} |
|
439 |
} |
|
440 |
||
441 |
// For classes we don't know, the following |
|
442 |
// may be the best try. |
|
443 |
if (this.algParamSpec.equals(algParamSpec)) { |
|
444 |
return true; |
|
445 |
} |
|
446 |
return false; |
|
447 |
} else if (this.checkParam) { |
|
448 |
return false; |
|
449 |
} else { |
|
450 |
return true; |
|
451 |
} |
|
452 |
} |
|
453 |
||
454 |
private boolean equalObjects(Object obj1, Object obj2) { |
|
455 |
if (obj1 == null) { |
|
456 |
return (obj2 == null ? true : false); |
|
457 |
} |
|
458 |
||
459 |
return obj1.equals(obj2); |
|
460 |
} |
|
461 |
} |
|
462 |
||
463 |
/** |
|
464 |
* A CryptoPermissionCollection stores a set of CryptoPermission |
|
465 |
* permissions. |
|
466 |
* |
|
467 |
* @see java.security.Permission |
|
468 |
* @see java.security.Permissions |
|
469 |
* @see java.security.PermissionCollection |
|
470 |
* |
|
471 |
* @author Sharon Liu |
|
472 |
*/ |
|
473 |
final class CryptoPermissionCollection extends PermissionCollection |
|
14014 | 474 |
implements Serializable |
475 |
{ |
|
2 | 476 |
private static final long serialVersionUID = -511215555898802763L; |
477 |
||
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
478 |
private Vector<Permission> permissions; |
2 | 479 |
|
480 |
/** |
|
481 |
* Creates an empty CryptoPermissionCollection |
|
482 |
* object. |
|
483 |
*/ |
|
484 |
CryptoPermissionCollection() { |
|
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
485 |
permissions = new Vector<Permission>(3); |
2 | 486 |
} |
487 |
||
488 |
/** |
|
489 |
* Adds a permission to the CryptoPermissionCollection. |
|
490 |
* |
|
491 |
* @param permission the Permission object to add. |
|
492 |
* |
|
493 |
* @exception SecurityException - if this CryptoPermissionCollection |
|
494 |
* object has been marked <i>readOnly</i>. |
|
495 |
*/ |
|
14014 | 496 |
public void add(Permission permission) { |
2 | 497 |
if (isReadOnly()) |
498 |
throw new SecurityException("attempt to add a Permission " + |
|
499 |
"to a readonly PermissionCollection"); |
|
500 |
||
501 |
if (!(permission instanceof CryptoPermission)) |
|
502 |
return; |
|
503 |
||
504 |
permissions.addElement(permission); |
|
505 |
} |
|
506 |
||
507 |
/** |
|
14014 | 508 |
* Check and see if this CryptoPermission object implies |
509 |
* the given Permission object. |
|
2 | 510 |
* |
14014 | 511 |
* @param permission the Permission object to compare |
2 | 512 |
* |
513 |
* @return true if the given permission is implied by this |
|
514 |
* CryptoPermissionCollection, false if not. |
|
515 |
*/ |
|
516 |
public boolean implies(Permission permission) { |
|
517 |
if (!(permission instanceof CryptoPermission)) |
|
518 |
return false; |
|
519 |
||
520 |
CryptoPermission cp = (CryptoPermission)permission; |
|
521 |
||
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
522 |
Enumeration<Permission> e = permissions.elements(); |
2 | 523 |
|
524 |
while (e.hasMoreElements()) { |
|
525 |
CryptoPermission x = (CryptoPermission) e.nextElement(); |
|
526 |
if (x.implies(cp)) { |
|
527 |
return true; |
|
528 |
} |
|
529 |
} |
|
530 |
return false; |
|
531 |
} |
|
532 |
||
533 |
/** |
|
534 |
* Returns an enumeration of all the CryptoPermission objects |
|
535 |
* in the container. |
|
536 |
* |
|
537 |
* @return an enumeration of all the CryptoPermission objects. |
|
538 |
*/ |
|
539 |
||
14014 | 540 |
public Enumeration<Permission> elements() { |
2 | 541 |
return permissions.elements(); |
542 |
} |
|
543 |
} |