| /* |
| * Copyright (c) 2000, 2008, 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.*; |
| import java.security.cert.*; |
| import java.security.cert.PKIXReason; |
| |
| import sun.security.util.Debug; |
| import sun.security.x509.PKIXExtensions; |
| |
| /** |
| * KeyChecker is a <code>PKIXCertPathChecker</code> that checks that the |
| * keyCertSign bit is set in the keyUsage extension in an intermediate CA |
| * certificate. It also checks whether the final certificate in a |
| * certification path meets the specified target constraints specified as |
| * a CertSelector in the PKIXParameters passed to the CertPathValidator. |
| * |
| * @since 1.4 |
| * @author Yassir Elley |
| */ |
| class KeyChecker extends PKIXCertPathChecker { |
| |
| private static final Debug debug = Debug.getInstance("certpath"); |
| // the index of keyCertSign in the boolean KeyUsage array |
| private static final int keyCertSign = 5; |
| private final int certPathLen; |
| private CertSelector targetConstraints; |
| private int remainingCerts; |
| |
| private Set<String> supportedExts; |
| |
| /** |
| * Default Constructor |
| * |
| * @param certPathLen allowable cert path length |
| * @param targetCertSel a CertSelector object specifying the constraints |
| * on the target certificate |
| */ |
| KeyChecker(int certPathLen, CertSelector targetCertSel) |
| throws CertPathValidatorException |
| { |
| this.certPathLen = certPathLen; |
| this.targetConstraints = targetCertSel; |
| init(false); |
| } |
| |
| /** |
| * Initializes the internal state of the checker from parameters |
| * specified in the constructor |
| */ |
| public void init(boolean forward) throws CertPathValidatorException { |
| if (!forward) { |
| remainingCerts = certPathLen; |
| } else { |
| throw new CertPathValidatorException |
| ("forward checking not supported"); |
| } |
| } |
| |
| public final boolean isForwardCheckingSupported() { |
| return false; |
| } |
| |
| public Set<String> getSupportedExtensions() { |
| if (supportedExts == null) { |
| supportedExts = new HashSet<String>(); |
| supportedExts.add(PKIXExtensions.KeyUsage_Id.toString()); |
| supportedExts.add(PKIXExtensions.ExtendedKeyUsage_Id.toString()); |
| supportedExts.add(PKIXExtensions.SubjectAlternativeName_Id.toString()); |
| supportedExts = Collections.unmodifiableSet(supportedExts); |
| } |
| return supportedExts; |
| } |
| |
| /** |
| * Checks that keyUsage and target constraints are satisfied by |
| * the specified certificate. |
| * |
| * @param cert the Certificate |
| * @param unresolvedCritExts the unresolved critical extensions |
| * @exception CertPathValidatorException Exception thrown if certificate |
| * does not verify |
| */ |
| public void check(Certificate cert, Collection<String> unresCritExts) |
| throws CertPathValidatorException |
| { |
| X509Certificate currCert = (X509Certificate) cert; |
| |
| remainingCerts--; |
| |
| // if final certificate, check that target constraints are satisfied |
| if (remainingCerts == 0) { |
| if ((targetConstraints != null) && |
| (targetConstraints.match(currCert) == false)) { |
| throw new CertPathValidatorException("target certificate " + |
| "constraints check failed"); |
| } |
| } else { |
| // otherwise, verify that keyCertSign bit is set in CA certificate |
| verifyCAKeyUsage(currCert); |
| } |
| |
| // remove the extensions that we have checked |
| if (unresCritExts != null && !unresCritExts.isEmpty()) { |
| unresCritExts.remove(PKIXExtensions.KeyUsage_Id.toString()); |
| unresCritExts.remove(PKIXExtensions.ExtendedKeyUsage_Id.toString()); |
| unresCritExts.remove( |
| PKIXExtensions.SubjectAlternativeName_Id.toString()); |
| } |
| } |
| |
| /** |
| * Static method to verify that the key usage and extended key usage |
| * extension in a CA cert. The key usage extension, if present, must |
| * assert the keyCertSign bit. The extended key usage extension, if |
| * present, must include anyExtendedKeyUsage. |
| */ |
| static void verifyCAKeyUsage(X509Certificate cert) |
| throws CertPathValidatorException { |
| String msg = "CA key usage"; |
| if (debug != null) { |
| debug.println("KeyChecker.verifyCAKeyUsage() ---checking " + msg |
| + "..."); |
| } |
| |
| boolean[] keyUsageBits = cert.getKeyUsage(); |
| |
| // getKeyUsage returns null if the KeyUsage extension is not present |
| // in the certificate - in which case there is nothing to check |
| if (keyUsageBits == null) { |
| return; |
| } |
| |
| // throw an exception if the keyCertSign bit is not set |
| if (!keyUsageBits[keyCertSign]) { |
| throw new CertPathValidatorException |
| (msg + " check failed: keyCertSign bit is not set", null, |
| null, -1, PKIXReason.INVALID_KEY_USAGE); |
| } |
| |
| if (debug != null) { |
| debug.println("KeyChecker.verifyCAKeyUsage() " + msg |
| + " verified."); |
| } |
| } |
| } |