| /* |
| * Copyright (c) 2009, 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.provider.certpath; |
| |
| import java.util.Set; |
| import java.util.Collection; |
| import java.util.Locale; |
| import java.security.cert.Certificate; |
| import java.security.cert.X509Certificate; |
| import java.security.cert.X509CRL; |
| import java.security.cert.CertPathValidatorException; |
| import java.security.cert.PKIXCertPathChecker; |
| |
| import sun.security.x509.AlgorithmId; |
| |
| /** |
| * AlgorithmChecker is a <code>PKIXCertPathChecker</code> that checks that |
| * the signature algorithm of the specified certificate is not disabled. |
| * |
| * @author Xuelei Fan |
| */ |
| final public class AlgorithmChecker extends PKIXCertPathChecker { |
| |
| // the disabled algorithms |
| private static final String[] disabledAlgorithms = new String[] {"md2"}; |
| |
| // singleton instance |
| static final AlgorithmChecker INSTANCE = new AlgorithmChecker(); |
| |
| /** |
| * Default Constructor |
| */ |
| private AlgorithmChecker() { |
| // do nothing |
| } |
| |
| /** |
| * Return a AlgorithmChecker instance. |
| */ |
| static AlgorithmChecker getInstance() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Initializes the internal state of the checker from parameters |
| * specified in the constructor. |
| */ |
| public void init(boolean forward) throws CertPathValidatorException { |
| // do nothing |
| } |
| |
| public boolean isForwardCheckingSupported() { |
| return false; |
| } |
| |
| public Set<String> getSupportedExtensions() { |
| return null; |
| } |
| |
| /** |
| * Checks the signature algorithm of the specified certificate. |
| */ |
| public void check(Certificate cert, Collection<String> unresolvedCritExts) |
| throws CertPathValidatorException { |
| check(cert); |
| } |
| |
| public static void check(Certificate cert) |
| throws CertPathValidatorException { |
| X509Certificate xcert = (X509Certificate)cert; |
| check(xcert.getSigAlgName()); |
| } |
| |
| static void check(AlgorithmId aid) throws CertPathValidatorException { |
| check(aid.getName()); |
| } |
| |
| static void check(X509CRL crl) throws CertPathValidatorException { |
| check(crl.getSigAlgName()); |
| } |
| |
| private static void check(String algName) |
| throws CertPathValidatorException { |
| |
| String lowerCaseAlgName = algName.toLowerCase(Locale.ENGLISH); |
| |
| for (String disabled : disabledAlgorithms) { |
| // checking the signature algorithm name |
| if (lowerCaseAlgName.indexOf(disabled) != -1) { |
| throw new CertPathValidatorException( |
| "algorithm check failed: " + algName + " is disabled"); |
| } |
| } |
| } |
| |
| } |