| /* |
| * 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.Collection; |
| import java.util.Collections; |
| import java.util.Set; |
| import java.util.HashSet; |
| import java.io.IOException; |
| import java.security.cert.Certificate; |
| import java.security.cert.CertificateException; |
| import java.security.cert.CertPathValidatorException; |
| import java.security.cert.X509Certificate; |
| import java.security.cert.PKIXCertPathChecker; |
| import java.security.cert.PKIXReason; |
| import sun.security.util.Debug; |
| import sun.security.x509.PKIXExtensions; |
| import sun.security.x509.NameConstraintsExtension; |
| import sun.security.x509.X509CertImpl; |
| |
| /** |
| * ConstraintsChecker is a <code>PKIXCertPathChecker</code> that checks |
| * constraints information on a PKIX certificate, namely basic constraints |
| * and name constraints. |
| * |
| * @since 1.4 |
| * @author Yassir Elley |
| */ |
| class ConstraintsChecker extends PKIXCertPathChecker { |
| |
| private static final Debug debug = Debug.getInstance("certpath"); |
| /* length of cert path */ |
| private final int certPathLength; |
| /* current maximum path length (as defined in PKIX) */ |
| private int maxPathLength; |
| /* current index of cert */ |
| private int i; |
| private NameConstraintsExtension prevNC; |
| |
| private Set<String> supportedExts; |
| |
| /** |
| * Creates a ConstraintsChecker. |
| * |
| * @param certPathLength the length of the certification path |
| * @throws CertPathValidatorException if the checker cannot be initialized |
| */ |
| ConstraintsChecker(int certPathLength) throws CertPathValidatorException { |
| this.certPathLength = certPathLength; |
| init(false); |
| } |
| |
| public void init(boolean forward) throws CertPathValidatorException { |
| if (!forward) { |
| i = 0; |
| maxPathLength = certPathLength; |
| prevNC = null; |
| } else { |
| throw new CertPathValidatorException |
| ("forward checking not supported"); |
| } |
| } |
| |
| public boolean isForwardCheckingSupported() { |
| return false; |
| } |
| |
| public Set<String> getSupportedExtensions() { |
| if (supportedExts == null) { |
| supportedExts = new HashSet<String>(); |
| supportedExts.add(PKIXExtensions.BasicConstraints_Id.toString()); |
| supportedExts.add(PKIXExtensions.NameConstraints_Id.toString()); |
| supportedExts = Collections.unmodifiableSet(supportedExts); |
| } |
| return supportedExts; |
| } |
| |
| /** |
| * Performs the basic constraints and name constraints |
| * checks on the certificate using its internal state. |
| * |
| * @param cert the <code>Certificate</code> to be checked |
| * @param unresCritExts a <code>Collection</code> of OID strings |
| * representing the current set of unresolved critical extensions |
| * @throws CertPathValidatorException if the specified certificate |
| * does not pass the check |
| */ |
| public void check(Certificate cert, Collection<String> unresCritExts) |
| throws CertPathValidatorException |
| { |
| X509Certificate currCert = (X509Certificate) cert; |
| |
| i++; |
| // MUST run NC check second, since it depends on BC check to |
| // update remainingCerts |
| checkBasicConstraints(currCert); |
| verifyNameConstraints(currCert); |
| |
| if (unresCritExts != null && !unresCritExts.isEmpty()) { |
| unresCritExts.remove(PKIXExtensions.BasicConstraints_Id.toString()); |
| unresCritExts.remove(PKIXExtensions.NameConstraints_Id.toString()); |
| } |
| } |
| |
| /** |
| * Internal method to check the name constraints against a cert |
| */ |
| private void verifyNameConstraints(X509Certificate currCert) |
| throws CertPathValidatorException |
| { |
| String msg = "name constraints"; |
| if (debug != null) { |
| debug.println("---checking " + msg + "..."); |
| } |
| |
| // check name constraints only if there is a previous name constraint |
| // and either the currCert is the final cert or the currCert is not |
| // self-issued |
| if (prevNC != null && ((i == certPathLength) || |
| !X509CertImpl.isSelfIssued(currCert))) { |
| if (debug != null) { |
| debug.println("prevNC = " + prevNC); |
| debug.println("currDN = " + currCert.getSubjectX500Principal()); |
| } |
| |
| try { |
| if (!prevNC.verify(currCert)) { |
| throw new CertPathValidatorException(msg + " check failed", |
| null, null, -1, PKIXReason.INVALID_NAME); |
| } |
| } catch (IOException ioe) { |
| throw new CertPathValidatorException(ioe); |
| } |
| } |
| |
| // merge name constraints regardless of whether cert is self-issued |
| prevNC = mergeNameConstraints(currCert, prevNC); |
| |
| if (debug != null) |
| debug.println(msg + " verified."); |
| } |
| |
| /** |
| * Helper to fold sets of name constraints together |
| */ |
| static NameConstraintsExtension |
| mergeNameConstraints(X509Certificate currCert, |
| NameConstraintsExtension prevNC) throws CertPathValidatorException |
| { |
| X509CertImpl currCertImpl; |
| try { |
| currCertImpl = X509CertImpl.toImpl(currCert); |
| } catch (CertificateException ce) { |
| throw new CertPathValidatorException(ce); |
| } |
| |
| NameConstraintsExtension newConstraints = |
| currCertImpl.getNameConstraintsExtension(); |
| |
| if (debug != null) { |
| debug.println("prevNC = " + prevNC); |
| debug.println("newNC = " + String.valueOf(newConstraints)); |
| } |
| |
| // if there are no previous name constraints, we just return the |
| // new name constraints. |
| if (prevNC == null) { |
| if (debug != null) { |
| debug.println("mergedNC = " + String.valueOf(newConstraints)); |
| } |
| if (newConstraints == null) { |
| return newConstraints; |
| } else { |
| // Make sure we do a clone here, because we're probably |
| // going to modify this object later and we don't want to |
| // be sharing it with a Certificate object! |
| return (NameConstraintsExtension) newConstraints.clone(); |
| } |
| } else { |
| try { |
| // after merge, prevNC should contain the merged constraints |
| prevNC.merge(newConstraints); |
| } catch (IOException ioe) { |
| throw new CertPathValidatorException(ioe); |
| } |
| if (debug != null) { |
| debug.println("mergedNC = " + prevNC); |
| } |
| return prevNC; |
| } |
| } |
| |
| /** |
| * Internal method to check that a given cert meets basic constraints. |
| */ |
| private void checkBasicConstraints(X509Certificate currCert) |
| throws CertPathValidatorException |
| { |
| String msg = "basic constraints"; |
| if (debug != null) { |
| debug.println("---checking " + msg + "..."); |
| debug.println("i = " + i); |
| debug.println("maxPathLength = " + maxPathLength); |
| } |
| |
| /* check if intermediate cert */ |
| if (i < certPathLength) { |
| // RFC5280: If certificate i is a version 3 certificate, verify |
| // that the basicConstraints extension is present and that cA is |
| // set to TRUE. (If certificate i is a version 1 or version 2 |
| // certificate, then the application MUST either verify that |
| // certificate i is a CA certificate through out-of-band means |
| // or reject the certificate. Conforming implementations may |
| // choose to reject all version 1 and version 2 intermediate |
| // certificates.) |
| // |
| // We choose to reject all version 1 and version 2 intermediate |
| // certificates except that it is self issued by the trust |
| // anchor in order to support key rollover or changes in |
| // certificate policies. |
| int pathLenConstraint = -1; |
| if (currCert.getVersion() < 3) { // version 1 or version 2 |
| if (i == 1) { // issued by a trust anchor |
| if (X509CertImpl.isSelfIssued(currCert)) { |
| pathLenConstraint = Integer.MAX_VALUE; |
| } |
| } |
| } else { |
| pathLenConstraint = currCert.getBasicConstraints(); |
| } |
| |
| if (pathLenConstraint == -1) { |
| throw new CertPathValidatorException |
| (msg + " check failed: this is not a CA certificate", |
| null, null, -1, PKIXReason.NOT_CA_CERT); |
| } |
| |
| if (!X509CertImpl.isSelfIssued(currCert)) { |
| if (maxPathLength <= 0) { |
| throw new CertPathValidatorException |
| (msg + " check failed: pathLenConstraint violated - " |
| + "this cert must be the last cert in the " |
| + "certification path", null, null, -1, |
| PKIXReason.PATH_TOO_LONG); |
| } |
| maxPathLength--; |
| } |
| if (pathLenConstraint < maxPathLength) |
| maxPathLength = pathLenConstraint; |
| } |
| |
| if (debug != null) { |
| debug.println("after processing, maxPathLength = " + maxPathLength); |
| debug.println(msg + " verified."); |
| } |
| } |
| |
| /** |
| * Merges the specified maxPathLength with the pathLenConstraint |
| * obtained from the certificate. |
| * |
| * @param cert the <code>X509Certificate</code> |
| * @param maxPathLength the previous maximum path length |
| * @return the new maximum path length constraint (-1 means no more |
| * certificates can follow, Integer.MAX_VALUE means path length is |
| * unconstrained) |
| */ |
| static int mergeBasicConstraints(X509Certificate cert, int maxPathLength) { |
| |
| int pathLenConstraint = cert.getBasicConstraints(); |
| |
| if (!X509CertImpl.isSelfIssued(cert)) { |
| maxPathLength--; |
| } |
| |
| if (pathLenConstraint < maxPathLength) { |
| maxPathLength = pathLenConstraint; |
| } |
| |
| return maxPathLength; |
| } |
| } |
