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105 lines
3.9 KiB
Java
105 lines
3.9 KiB
Java
/*
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* Copyright (c) 2015, 2022, 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 sun.security.util;
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import java.security.AccessController;
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import java.security.AlgorithmConstraints;
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import java.security.PrivilegedAction;
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import java.security.Security;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Set;
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import java.util.TreeSet;
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/**
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* The class contains common functionality for algorithm constraints classes.
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*/
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public abstract class AbstractAlgorithmConstraints
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implements AlgorithmConstraints {
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protected final AlgorithmDecomposer decomposer;
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protected AbstractAlgorithmConstraints(AlgorithmDecomposer decomposer) {
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this.decomposer = decomposer;
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}
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// Get algorithm constraints from the specified security property.
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static Set<String> getAlgorithms(String propertyName) {
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@SuppressWarnings("removal")
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String property = AccessController.doPrivileged(
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new PrivilegedAction<String>() {
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@Override
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public String run() {
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return Security.getProperty(propertyName);
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}
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});
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String[] algorithmsInProperty = null;
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if (property != null && !property.isEmpty()) {
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// remove double quote marks from beginning/end of the property
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if (property.length() >= 2 && property.charAt(0) == '"' &&
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property.charAt(property.length() - 1) == '"') {
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property = property.substring(1, property.length() - 1);
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}
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algorithmsInProperty = property.split(",");
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for (int i = 0; i < algorithmsInProperty.length; i++) {
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algorithmsInProperty[i] = algorithmsInProperty[i].trim();
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}
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}
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// map the disabled algorithms
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if (algorithmsInProperty == null) {
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return Collections.emptySet();
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}
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Set<String> algorithmsInPropertySet = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
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algorithmsInPropertySet.addAll(Arrays.asList(algorithmsInProperty));
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return algorithmsInPropertySet;
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}
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static boolean checkAlgorithm(Set<String> algorithms, String algorithm,
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AlgorithmDecomposer decomposer) {
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if (algorithm == null || algorithm.isEmpty()) {
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throw new IllegalArgumentException("No algorithm name specified");
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}
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if (algorithms.contains(algorithm)) {
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return false;
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}
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// decompose the algorithm into sub-elements
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Set<String> elements = decomposer.decompose(algorithm);
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// check the element of the elements
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for (String element : elements) {
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if (algorithms.contains(element)) {
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return false;
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}
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}
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return true;
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}
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}
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