mirror of git://gcc.gnu.org/git/gcc.git
695 lines
24 KiB
Java
695 lines
24 KiB
Java
/* PKIXCertPathValidatorImpl.java -- PKIX certificate path validator.
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Copyright (C) 2004, 2005, 2006, 2010 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.provider;
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import gnu.java.security.Configuration;
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import gnu.java.security.OID;
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import gnu.java.security.Registry;
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import gnu.java.security.key.dss.DSSPublicKey;
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import gnu.java.security.x509.GnuPKIExtension;
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import gnu.java.security.x509.PolicyNodeImpl;
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import gnu.java.security.x509.X509CRLSelectorImpl;
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import gnu.java.security.x509.X509CertSelectorImpl;
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import gnu.java.security.x509.ext.BasicConstraints;
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import gnu.java.security.x509.ext.CertificatePolicies;
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import gnu.java.security.x509.ext.Extension;
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import gnu.java.security.x509.ext.KeyUsage;
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import gnu.java.security.x509.ext.PolicyConstraint;
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import java.io.IOException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.PublicKey;
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import java.security.cert.CRL;
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import java.security.cert.CertPath;
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import java.security.cert.CertPathParameters;
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import java.security.cert.CertPathValidatorException;
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import java.security.cert.CertPathValidatorResult;
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import java.security.cert.CertPathValidatorSpi;
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import java.security.cert.CertStore;
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import java.security.cert.CertStoreException;
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import java.security.cert.CertificateException;
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import java.security.cert.PKIXCertPathChecker;
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import java.security.cert.PKIXCertPathValidatorResult;
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import java.security.cert.PKIXParameters;
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import java.security.cert.TrustAnchor;
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import java.security.cert.X509CRL;
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import java.security.cert.X509Certificate;
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import java.security.interfaces.DSAParams;
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import java.security.interfaces.DSAPublicKey;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Set;
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import java.util.logging.Logger;
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/**
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* An implementation of the Public Key Infrastructure's X.509 certificate path
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* validation algorithm.
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* <p>
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* See <a href="http://www.ietf.org/rfc/rfc3280.txt">RFC 3280: Internet X.509
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* Public Key Infrastructure Certificate and Certificate Revocation List (CRL)
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* Profile</a>.
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*
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* @author Casey Marshall (rsdio@metastatic.org)
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*/
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public class PKIXCertPathValidatorImpl
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extends CertPathValidatorSpi
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{
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private static final Logger log = Configuration.DEBUG ?
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Logger.getLogger(PKIXCertPathValidatorImpl.class.getName()) : null;
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public static final String ANY_POLICY = "2.5.29.32.0";
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public PKIXCertPathValidatorImpl()
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{
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super();
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}
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public CertPathValidatorResult engineValidate(CertPath path,
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CertPathParameters params)
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throws CertPathValidatorException, InvalidAlgorithmParameterException
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{
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if (! (params instanceof PKIXParameters))
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throw new InvalidAlgorithmParameterException("not a PKIXParameters object");
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// First check if the certificate path is valid.
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//
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// This means that:
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//
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// (a) for all x in {1, ..., n-1}, the subject of certificate x is
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// the issuer of certificate x+1;
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//
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// (b) for all x in {1, ..., n}, the certificate was valid at the
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// time in question.
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//
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// Because this is the X.509 algorithm, we also check if all
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// cerificates are of type X509Certificate.
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PolicyNodeImpl rootNode = new PolicyNodeImpl();
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Set initPolicies = ((PKIXParameters) params).getInitialPolicies();
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rootNode.setValidPolicy(ANY_POLICY);
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rootNode.setCritical(false);
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rootNode.setDepth(0);
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if (initPolicies != null)
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rootNode.addAllExpectedPolicies(initPolicies);
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else
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rootNode.addExpectedPolicy(ANY_POLICY);
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List checks = ((PKIXParameters) params).getCertPathCheckers();
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List l = path.getCertificates();
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if (l == null || l.size() == 0)
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throw new CertPathValidatorException();
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X509Certificate[] p = null;
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try
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{
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p = (X509Certificate[]) l.toArray(new X509Certificate[l.size()]);
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}
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catch (ClassCastException cce)
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{
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throw new CertPathValidatorException("invalid certificate path");
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}
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String sigProvider = ((PKIXParameters) params).getSigProvider();
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PublicKey prevKey = null;
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Date now = ((PKIXParameters) params).getDate();
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if (now == null)
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now = new Date();
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LinkedList policyConstraints = new LinkedList();
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for (int i = p.length - 1; i >= 0; i--)
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{
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try
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{
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p[i].checkValidity(now);
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}
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catch (CertificateException ce)
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{
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throw new CertPathValidatorException(ce.toString());
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}
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Set uce = getCritExts(p[i]);
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for (Iterator check = checks.iterator(); check.hasNext();)
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{
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try
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{
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((PKIXCertPathChecker) check.next()).check(p[i], uce);
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}
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catch (Exception x)
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{
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}
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}
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PolicyConstraint constr = null;
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if (p[i] instanceof GnuPKIExtension)
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{
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Extension pcx = ((GnuPKIExtension) p[i]).getExtension(PolicyConstraint.ID);
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if (pcx != null)
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constr = (PolicyConstraint) pcx.getValue();
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}
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else
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{
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byte[] pcx = p[i].getExtensionValue(PolicyConstraint.ID.toString());
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if (pcx != null)
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{
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try
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{
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constr = new PolicyConstraint(pcx);
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}
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catch (Exception x)
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{
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}
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}
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}
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if (constr != null && constr.getRequireExplicitPolicy() >= 0)
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policyConstraints.add(new int[] { p.length - i,
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constr.getRequireExplicitPolicy() });
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updatePolicyTree(p[i], rootNode, p.length - i, (PKIXParameters) params,
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checkExplicitPolicy(p.length - i, policyConstraints));
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// The rest of the tests involve this cert's relationship with the
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// next in the path. If this cert is the end entity, we can stop.
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if (i == 0)
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break;
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basicSanity(p, i);
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PublicKey pubKey = null;
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try
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{
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pubKey = p[i].getPublicKey();
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if (pubKey instanceof DSAPublicKey)
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{
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DSAParams dsa = ((DSAPublicKey) pubKey).getParams();
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// If the DSA public key is missing its parameters, use those
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// from the previous cert's key.
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if (dsa == null || dsa.getP() == null || dsa.getG() == null
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|| dsa.getQ() == null)
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{
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if (prevKey == null)
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throw new InvalidKeyException("DSA keys not chainable");
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if (! (prevKey instanceof DSAPublicKey))
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throw new InvalidKeyException("DSA keys not chainable");
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dsa = ((DSAPublicKey) prevKey).getParams();
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pubKey = new DSSPublicKey(Registry.X509_ENCODING_ID,
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dsa.getP(), dsa.getQ(),
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dsa.getG(),
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((DSAPublicKey) pubKey).getY());
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}
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}
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if (sigProvider == null)
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p[i - 1].verify(pubKey);
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else
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p[i - 1].verify(pubKey, sigProvider);
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prevKey = pubKey;
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}
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catch (Exception e)
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{
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throw new CertPathValidatorException(e.toString());
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}
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if (! p[i].getSubjectDN().equals(p[i - 1].getIssuerDN()))
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throw new CertPathValidatorException("issuer DN mismatch");
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boolean[] issuerUid = p[i - 1].getIssuerUniqueID();
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boolean[] subjectUid = p[i].getSubjectUniqueID();
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if (issuerUid != null && subjectUid != null)
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if (! Arrays.equals(issuerUid, subjectUid))
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throw new CertPathValidatorException("UID mismatch");
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// Check the certificate against the revocation lists.
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if (((PKIXParameters) params).isRevocationEnabled())
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{
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X509CRLSelectorImpl selector = new X509CRLSelectorImpl();
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try
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{
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selector.addIssuerName(p[i].getSubjectDN());
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}
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catch (IOException ioe)
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{
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throw new CertPathValidatorException("error selecting CRLs");
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}
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List certStores = ((PKIXParameters) params).getCertStores();
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List crls = new LinkedList();
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for (Iterator it = certStores.iterator(); it.hasNext();)
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{
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CertStore cs = (CertStore) it.next();
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try
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{
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Collection c = cs.getCRLs(selector);
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crls.addAll(c);
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}
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catch (CertStoreException cse)
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{
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}
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}
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if (crls.isEmpty())
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throw new CertPathValidatorException("no CRLs for issuer");
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boolean certOk = false;
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for (Iterator it = crls.iterator(); it.hasNext();)
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{
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CRL crl = (CRL) it.next();
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if (! (crl instanceof X509CRL))
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continue;
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X509CRL xcrl = (X509CRL) crl;
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if (! checkCRL(xcrl, p, now, p[i], pubKey, certStores))
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continue;
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if (xcrl.isRevoked(p[i - 1]))
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throw new CertPathValidatorException("certificate is revoked");
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else
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certOk = true;
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}
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if (! certOk)
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throw new CertPathValidatorException(
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"certificate's validity could not be determined");
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}
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}
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rootNode.setReadOnly();
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// Now ensure that the first certificate in the chain was issued
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// by a trust anchor.
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Exception cause = null;
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Set anchors = ((PKIXParameters) params).getTrustAnchors();
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for (Iterator i = anchors.iterator(); i.hasNext();)
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{
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TrustAnchor anchor = (TrustAnchor) i.next();
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X509Certificate anchorCert = null;
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PublicKey anchorKey = null;
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if (anchor.getTrustedCert() != null)
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{
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anchorCert = anchor.getTrustedCert();
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anchorKey = anchorCert.getPublicKey();
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}
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else
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anchorKey = anchor.getCAPublicKey();
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if (anchorKey == null)
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continue;
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try
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{
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if (anchorCert != null)
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anchorCert.checkValidity(now);
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p[p.length - 1].verify(anchorKey);
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if (anchorCert != null && anchorCert.getBasicConstraints() >= 0
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&& anchorCert.getBasicConstraints() < p.length)
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continue;
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if (((PKIXParameters) params).isRevocationEnabled())
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{
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X509CRLSelectorImpl selector = new X509CRLSelectorImpl();
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if (anchorCert != null)
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try
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{
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selector.addIssuerName(anchorCert.getSubjectDN());
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}
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catch (IOException ioe)
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{
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}
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else
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selector.addIssuerName(anchor.getCAName());
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List certStores = ((PKIXParameters) params).getCertStores();
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List crls = new LinkedList();
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for (Iterator it = certStores.iterator(); it.hasNext();)
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{
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CertStore cs = (CertStore) it.next();
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try
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{
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Collection c = cs.getCRLs(selector);
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crls.addAll(c);
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}
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catch (CertStoreException cse)
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{
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}
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}
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if (crls.isEmpty())
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continue;
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for (Iterator it = crls.iterator(); it.hasNext();)
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{
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CRL crl = (CRL) it.next();
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if (! (crl instanceof X509CRL))
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continue;
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X509CRL xcrl = (X509CRL) crl;
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try
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{
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xcrl.verify(anchorKey);
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}
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catch (Exception x)
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{
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continue;
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}
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Date nextUpdate = xcrl.getNextUpdate();
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if (nextUpdate != null && nextUpdate.compareTo(now) < 0)
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continue;
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if (xcrl.isRevoked(p[p.length - 1]))
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throw new CertPathValidatorException("certificate is revoked");
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}
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}
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// The chain is valid; return the result.
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return new PKIXCertPathValidatorResult(anchor, rootNode,
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p[0].getPublicKey());
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}
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catch (Exception ignored)
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{
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cause = ignored;
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continue;
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}
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}
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// The path is not valid.
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CertPathValidatorException cpve =
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new CertPathValidatorException("path validation failed");
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if (cause != null)
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cpve.initCause(cause);
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throw cpve;
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}
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/**
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* Check if a given CRL is acceptable for checking the revocation status of
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* certificates in the path being checked.
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* <p>
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* The CRL is accepted iff:
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* <ol>
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* <li>The <i>nextUpdate</i> field (if present) is in the future.</li>
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* <li>The CRL does not contain any unsupported critical extensions.</li>
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* <li>The CRL is signed by one of the certificates in the path, or,</li>
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* <li>The CRL is signed by the given public key and was issued by the public
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* key's subject, or,</li>
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* <li>The CRL is signed by a certificate in the given cert stores, and that
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* cert is signed by one of the certificates in the path.</li>
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* </ol>
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*
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* @param crl The CRL being checked.
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* @param path The path this CRL is being checked against.
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* @param now The value to use as 'now'.
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* @param pubKeyCert The certificate authenticating the public key.
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* @param pubKey The public key to check.
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* @return True if the CRL is acceptable.
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*/
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private static boolean checkCRL(X509CRL crl, X509Certificate[] path,
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Date now, X509Certificate pubKeyCert,
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PublicKey pubKey, List certStores)
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{
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Date nextUpdate = crl.getNextUpdate();
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if (nextUpdate != null && nextUpdate.compareTo(now) < 0)
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return false;
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if (crl.hasUnsupportedCriticalExtension())
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return false;
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for (int i = 0; i < path.length; i++)
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{
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if (! path[i].getSubjectDN().equals(crl.getIssuerDN()))
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continue;
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boolean[] keyUsage = path[i].getKeyUsage();
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if (keyUsage != null)
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{
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if (! keyUsage[KeyUsage.CRL_SIGN])
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continue;
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}
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try
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{
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crl.verify(path[i].getPublicKey());
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return true;
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}
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catch (Exception x)
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{
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}
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}
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if (crl.getIssuerDN().equals(pubKeyCert.getSubjectDN()))
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{
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try
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{
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boolean[] keyUsage = pubKeyCert.getKeyUsage();
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if (keyUsage != null)
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{
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if (! keyUsage[KeyUsage.CRL_SIGN])
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throw new Exception();
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}
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crl.verify(pubKey);
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return true;
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}
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catch (Exception x)
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{
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}
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}
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try
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{
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X509CertSelectorImpl select = new X509CertSelectorImpl();
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select.addSubjectName(crl.getIssuerDN());
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List certs = new LinkedList();
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for (Iterator it = certStores.iterator(); it.hasNext();)
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{
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CertStore cs = (CertStore) it.next();
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try
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{
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certs.addAll(cs.getCertificates(select));
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}
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catch (CertStoreException cse)
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{
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}
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}
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for (Iterator it = certs.iterator(); it.hasNext();)
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{
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X509Certificate c = (X509Certificate) it.next();
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for (int i = 0; i < path.length; i++)
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{
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if (! c.getIssuerDN().equals(path[i].getSubjectDN()))
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continue;
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boolean[] keyUsage = c.getKeyUsage();
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if (keyUsage != null)
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{
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if (! keyUsage[KeyUsage.CRL_SIGN])
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continue;
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}
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try
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{
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c.verify(path[i].getPublicKey());
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crl.verify(c.getPublicKey());
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return true;
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}
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catch (Exception x)
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{
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}
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}
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if (c.getIssuerDN().equals(pubKeyCert.getSubjectDN()))
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{
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c.verify(pubKey);
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crl.verify(c.getPublicKey());
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}
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}
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}
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catch (Exception x)
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{
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}
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return false;
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}
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private static Set getCritExts(X509Certificate cert)
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{
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HashSet s = new HashSet();
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if (cert instanceof GnuPKIExtension)
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{
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Collection exts = ((GnuPKIExtension) cert).getExtensions();
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for (Iterator it = exts.iterator(); it.hasNext();)
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{
|
|
Extension ext = (Extension) it.next();
|
|
if (ext.isCritical() && ! ext.isSupported())
|
|
s.add(ext.getOid().toString());
|
|
}
|
|
}
|
|
else
|
|
s.addAll(cert.getCriticalExtensionOIDs());
|
|
return s;
|
|
}
|
|
|
|
/**
|
|
* Perform a basic sanity check on the CA certificate at <code>index</code>.
|
|
*/
|
|
private static void basicSanity(X509Certificate[] path, int index)
|
|
throws CertPathValidatorException
|
|
{
|
|
X509Certificate cert = path[index];
|
|
int pathLen = 0;
|
|
for (int i = index - 1; i > 0; i--)
|
|
{
|
|
if (! path[i].getIssuerDN().equals(path[i].getSubjectDN()))
|
|
pathLen++;
|
|
}
|
|
Extension e = null;
|
|
if (cert instanceof GnuPKIExtension)
|
|
{
|
|
e = ((GnuPKIExtension) cert).getExtension(BasicConstraints.ID);
|
|
}
|
|
else
|
|
{
|
|
try
|
|
{
|
|
e = new Extension(cert.getExtensionValue(BasicConstraints.ID.toString()));
|
|
}
|
|
catch (Exception x)
|
|
{
|
|
}
|
|
}
|
|
if (e == null)
|
|
throw new CertPathValidatorException("no basicConstraints");
|
|
BasicConstraints bc = (BasicConstraints) e.getValue();
|
|
if (! bc.isCA())
|
|
throw new CertPathValidatorException(
|
|
"certificate cannot be used to verify signatures");
|
|
if (bc.getPathLengthConstraint() >= 0
|
|
&& bc.getPathLengthConstraint() < pathLen)
|
|
throw new CertPathValidatorException("path is too long");
|
|
|
|
boolean[] keyUsage = cert.getKeyUsage();
|
|
if (keyUsage != null)
|
|
{
|
|
if (! keyUsage[KeyUsage.KEY_CERT_SIGN])
|
|
throw new CertPathValidatorException(
|
|
"certificate cannot be used to sign certificates");
|
|
}
|
|
}
|
|
|
|
private static void updatePolicyTree(X509Certificate cert,
|
|
PolicyNodeImpl root, int depth,
|
|
PKIXParameters params,
|
|
boolean explicitPolicy)
|
|
throws CertPathValidatorException
|
|
{
|
|
if (Configuration.DEBUG)
|
|
log.fine("updatePolicyTree depth == " + depth);
|
|
Set nodes = new HashSet();
|
|
LinkedList stack = new LinkedList();
|
|
Iterator current = null;
|
|
stack.addLast(Collections.singleton(root).iterator());
|
|
do
|
|
{
|
|
current = (Iterator) stack.removeLast();
|
|
while (current.hasNext())
|
|
{
|
|
PolicyNodeImpl p = (PolicyNodeImpl) current.next();
|
|
if (Configuration.DEBUG)
|
|
log.fine("visiting node == " + p);
|
|
if (p.getDepth() == depth - 1)
|
|
{
|
|
if (Configuration.DEBUG)
|
|
log.fine("added node");
|
|
nodes.add(p);
|
|
}
|
|
else
|
|
{
|
|
if (Configuration.DEBUG)
|
|
log.fine("skipped node");
|
|
stack.addLast(current);
|
|
current = p.getChildren();
|
|
}
|
|
}
|
|
}
|
|
while (! stack.isEmpty());
|
|
|
|
Extension e = null;
|
|
CertificatePolicies policies = null;
|
|
List qualifierInfos = null;
|
|
if (cert instanceof GnuPKIExtension)
|
|
{
|
|
e = ((GnuPKIExtension) cert).getExtension(CertificatePolicies.ID);
|
|
if (e != null)
|
|
policies = (CertificatePolicies) e.getValue();
|
|
}
|
|
|
|
List cp = null;
|
|
if (policies != null)
|
|
cp = policies.getPolicies();
|
|
else
|
|
cp = Collections.EMPTY_LIST;
|
|
boolean match = false;
|
|
if (Configuration.DEBUG)
|
|
{
|
|
log.fine("nodes are == " + nodes);
|
|
log.fine("cert policies are == " + cp);
|
|
}
|
|
for (Iterator it = nodes.iterator(); it.hasNext();)
|
|
{
|
|
PolicyNodeImpl parent = (PolicyNodeImpl) it.next();
|
|
if (Configuration.DEBUG)
|
|
log.fine("adding policies to " + parent);
|
|
for (Iterator it2 = cp.iterator(); it2.hasNext();)
|
|
{
|
|
OID policy = (OID) it2.next();
|
|
if (Configuration.DEBUG)
|
|
log.fine("trying to add policy == " + policy);
|
|
if (policy.toString().equals(ANY_POLICY)
|
|
&& params.isAnyPolicyInhibited())
|
|
continue;
|
|
PolicyNodeImpl child = new PolicyNodeImpl();
|
|
child.setValidPolicy(policy.toString());
|
|
child.addExpectedPolicy(policy.toString());
|
|
if (parent.getExpectedPolicies().contains(policy.toString()))
|
|
{
|
|
parent.addChild(child);
|
|
match = true;
|
|
}
|
|
else if (parent.getExpectedPolicies().contains(ANY_POLICY))
|
|
{
|
|
parent.addChild(child);
|
|
match = true;
|
|
}
|
|
else if (ANY_POLICY.equals(policy.toString()))
|
|
{
|
|
parent.addChild(child);
|
|
match = true;
|
|
}
|
|
if (match && policies != null)
|
|
{
|
|
List qualifiers = policies.getPolicyQualifierInfos(policy);
|
|
if (qualifiers != null)
|
|
child.addAllPolicyQualifiers(qualifiers);
|
|
}
|
|
}
|
|
}
|
|
if (! match && (params.isExplicitPolicyRequired() || explicitPolicy))
|
|
throw new CertPathValidatorException("policy tree building failed");
|
|
}
|
|
|
|
private boolean checkExplicitPolicy(int depth, List explicitPolicies)
|
|
{
|
|
if (Configuration.DEBUG)
|
|
log.fine("checkExplicitPolicy depth=" + depth);
|
|
for (Iterator it = explicitPolicies.iterator(); it.hasNext();)
|
|
{
|
|
int[] i = (int[]) it.next();
|
|
int caDepth = i[0];
|
|
int limit = i[1];
|
|
if (Configuration.DEBUG)
|
|
log.fine(" caDepth=" + caDepth + " limit=" + limit);
|
|
if (depth - caDepth >= limit)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
}
|