| /* |
| * 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package sun.security.util; |
| |
| import java.security.AccessController; |
| import java.security.AlgorithmConstraints; |
| import java.security.PrivilegedAction; |
| import java.security.Security; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * The class contains common functionality for algorithm constraints classes. |
| */ |
| public abstract class AbstractAlgorithmConstraints |
| implements AlgorithmConstraints { |
| |
| protected final AlgorithmDecomposer decomposer; |
| |
| protected AbstractAlgorithmConstraints(AlgorithmDecomposer decomposer) { |
| this.decomposer = decomposer; |
| } |
| |
| // Get algorithm constraints from the specified security property. |
| private static void loadAlgorithmsMap(Map<String, String[]> algorithmsMap, |
| String propertyName) { |
| String property = AccessController.doPrivileged( |
| (PrivilegedAction<String>) () -> Security.getProperty( |
| propertyName)); |
| |
| String[] algorithmsInProperty = null; |
| if (property != null && !property.isEmpty()) { |
| // remove double quote marks from beginning/end of the property |
| if (property.charAt(0) == '"' |
| && property.charAt(property.length() - 1) == '"') { |
| property = property.substring(1, property.length() - 1); |
| } |
| algorithmsInProperty = property.split(","); |
| for (int i = 0; i < algorithmsInProperty.length; |
| i++) { |
| algorithmsInProperty[i] = algorithmsInProperty[i].trim(); |
| } |
| } |
| |
| // map the disabled algorithms |
| if (algorithmsInProperty == null) { |
| algorithmsInProperty = new String[0]; |
| } |
| algorithmsMap.put(propertyName, algorithmsInProperty); |
| } |
| |
| static String[] getAlgorithms(Map<String, String[]> algorithmsMap, |
| String propertyName) { |
| synchronized (algorithmsMap) { |
| if (!algorithmsMap.containsKey(propertyName)) { |
| loadAlgorithmsMap(algorithmsMap, propertyName); |
| } |
| |
| return algorithmsMap.get(propertyName); |
| } |
| } |
| |
| static boolean checkAlgorithm(String[] algorithms, String algorithm, |
| AlgorithmDecomposer decomposer) { |
| if (algorithm == null || algorithm.length() == 0) { |
| throw new IllegalArgumentException("No algorithm name specified"); |
| } |
| |
| Set<String> elements = null; |
| for (String item : algorithms) { |
| if (item == null || item.isEmpty()) { |
| continue; |
| } |
| |
| // check the full name |
| if (item.equalsIgnoreCase(algorithm)) { |
| return false; |
| } |
| |
| // decompose the algorithm into sub-elements |
| if (elements == null) { |
| elements = decomposer.decompose(algorithm); |
| } |
| |
| // check the items of the algorithm |
| for (String element : elements) { |
| if (item.equalsIgnoreCase(element)) { |
| return false; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| } |