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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.4.
package org.bouncycastle.jce.provider;
import java.security.InvalidAlgorithmParameterException;
import java.security.PublicKey;
import java.security.cert.CertPath;
import java.security.cert.CertPathParameters;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertPathValidatorResult;
import java.security.cert.CertPathValidatorSpi;
import java.security.cert.PKIXCertPathChecker;
import java.security.cert.PKIXCertPathValidatorResult;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.jcajce.PKIXExtendedBuilderParameters;
import org.bouncycastle.jcajce.PKIXExtendedParameters;
import org.bouncycastle.jcajce.util.BCJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jce.exception.ExtCertPathValidatorException;
import org.bouncycastle.x509.ExtendedPKIXParameters;
/**
* CertPathValidatorSpi implementation for X.509 Certificate validation � la RFC
* 3280.
*/
public class PKIXCertPathValidatorSpi
extends CertPathValidatorSpi
{
private final JcaJceHelper helper = new BCJcaJceHelper();
public PKIXCertPathValidatorSpi()
{
}
public CertPathValidatorResult engineValidate(
CertPath certPath,
CertPathParameters params)
throws CertPathValidatorException,
InvalidAlgorithmParameterException
{
PKIXExtendedParameters paramsPKIX;
if (params instanceof PKIXParameters)
{
PKIXExtendedParameters.Builder paramsPKIXBldr = new PKIXExtendedParameters.Builder((PKIXParameters)params);
if (params instanceof ExtendedPKIXParameters)
{
ExtendedPKIXParameters extPKIX = (ExtendedPKIXParameters)params;
paramsPKIXBldr.setUseDeltasEnabled(extPKIX.isUseDeltasEnabled());
paramsPKIXBldr.setValidityModel(extPKIX.getValidityModel());
}
paramsPKIX = paramsPKIXBldr.build();
}
else if (params instanceof PKIXExtendedBuilderParameters)
{
paramsPKIX = ((PKIXExtendedBuilderParameters)params).getBaseParameters();
}
else if (params instanceof PKIXExtendedParameters)
{
paramsPKIX = (PKIXExtendedParameters)params;
}
else
{
throw new InvalidAlgorithmParameterException("Parameters must be a " + PKIXParameters.class.getName() + " instance.");
}
if (paramsPKIX.getTrustAnchors() == null)
{
throw new InvalidAlgorithmParameterException(
"trustAnchors is null, this is not allowed for certification path validation.");
}
//
// 6.1.1 - inputs
//
//
// (a)
//
List certs = certPath.getCertificates();
int n = certs.size();
if (certs.isEmpty())
{
throw new CertPathValidatorException("Certification path is empty.", null, certPath, -1);
}
//
// (b)
//
// Date validDate = CertPathValidatorUtilities.getValidDate(paramsPKIX);
//
// (c)
//
Set userInitialPolicySet = paramsPKIX.getInitialPolicies();
//
// (d)
//
TrustAnchor trust;
try
{
trust = CertPathValidatorUtilities.findTrustAnchor((X509Certificate) certs.get(certs.size() - 1),
paramsPKIX.getTrustAnchors(), paramsPKIX.getSigProvider());
}
catch (AnnotatedException e)
{
throw new CertPathValidatorException(e.getMessage(), e, certPath, certs.size() - 1);
}
if (trust == null)
{
throw new CertPathValidatorException("Trust anchor for certification path not found.", null, certPath, -1);
}
// RFC 5280 - CRLs must originate from the same trust anchor as the target certificate.
paramsPKIX = new PKIXExtendedParameters.Builder(paramsPKIX).setTrustAnchor(trust).build();
//
// (e), (f), (g) are part of the paramsPKIX object.
//
Iterator certIter;
int index = 0;
int i;
// Certificate for each interation of the validation loop
// Signature information for each iteration of the validation loop
//
// 6.1.2 - setup
//
//
// (a)
//
List[] policyNodes = new ArrayList[n + 1];
for (int j = 0; j < policyNodes.length; j++)
{
policyNodes[j] = new ArrayList();
}
Set policySet = new HashSet();
policySet.add(RFC3280CertPathUtilities.ANY_POLICY);
PKIXPolicyNode validPolicyTree = new PKIXPolicyNode(new ArrayList(), 0, policySet, null, new HashSet(),
RFC3280CertPathUtilities.ANY_POLICY, false);
policyNodes[0].add(validPolicyTree);
//
// (b) and (c)
//
PKIXNameConstraintValidator nameConstraintValidator = new PKIXNameConstraintValidator();
// (d)
//
int explicitPolicy;
Set acceptablePolicies = new HashSet();
if (paramsPKIX.isExplicitPolicyRequired())
{
explicitPolicy = 0;
}
else
{
explicitPolicy = n + 1;
}
//
// (e)
//
int inhibitAnyPolicy;
if (paramsPKIX.isAnyPolicyInhibited())
{
inhibitAnyPolicy = 0;
}
else
{
inhibitAnyPolicy = n + 1;
}
//
// (f)
//
int policyMapping;
if (paramsPKIX.isPolicyMappingInhibited())
{
policyMapping = 0;
}
else
{
policyMapping = n + 1;
}
//
// (g), (h), (i), (j)
//
PublicKey workingPublicKey;
X500Name workingIssuerName;
X509Certificate sign = trust.getTrustedCert();
try
{
if (sign != null)
{
workingIssuerName = PrincipalUtils.getSubjectPrincipal(sign);
workingPublicKey = sign.getPublicKey();
}
else
{
workingIssuerName = PrincipalUtils.getCA(trust);
workingPublicKey = trust.getCAPublicKey();
}
}
catch (IllegalArgumentException ex)
{
throw new ExtCertPathValidatorException("Subject of trust anchor could not be (re)encoded.", ex, certPath,
-1);
}
AlgorithmIdentifier workingAlgId = null;
try
{
workingAlgId = CertPathValidatorUtilities.getAlgorithmIdentifier(workingPublicKey);
}
catch (CertPathValidatorException e)
{
throw new ExtCertPathValidatorException(
"Algorithm identifier of public key of trust anchor could not be read.", e, certPath, -1);
}
ASN1ObjectIdentifier workingPublicKeyAlgorithm = workingAlgId.getAlgorithm();
ASN1Encodable workingPublicKeyParameters = workingAlgId.getParameters();
//
// (k)
//
int maxPathLength = n;
//
// 6.1.3
//
if (paramsPKIX.getTargetConstraints() != null
&& !paramsPKIX.getTargetConstraints().match((X509Certificate) certs.get(0)))
{
throw new ExtCertPathValidatorException(
"Target certificate in certification path does not match targetConstraints.", null, certPath, 0);
}
//
// initialize CertPathChecker's
//
List pathCheckers = paramsPKIX.getCertPathCheckers();
certIter = pathCheckers.iterator();
while (certIter.hasNext())
{
((PKIXCertPathChecker) certIter.next()).init(false);
}
X509Certificate cert = null;
for (index = certs.size() - 1; index >= 0; index--)
{
// try
// {
//
// i as defined in the algorithm description
//
i = n - index;
//
// set certificate to be checked in this round
// sign and workingPublicKey and workingIssuerName are set
// at the end of the for loop and initialized the
// first time from the TrustAnchor
//
cert = (X509Certificate) certs.get(index);
boolean verificationAlreadyPerformed = (index == certs.size() - 1);
//
// 6.1.3
//
RFC3280CertPathUtilities.processCertA(certPath, paramsPKIX, index, workingPublicKey,
verificationAlreadyPerformed, workingIssuerName, sign, helper);
RFC3280CertPathUtilities.processCertBC(certPath, index, nameConstraintValidator);
validPolicyTree = RFC3280CertPathUtilities.processCertD(certPath, index, acceptablePolicies,
validPolicyTree, policyNodes, inhibitAnyPolicy);
validPolicyTree = RFC3280CertPathUtilities.processCertE(certPath, index, validPolicyTree);
RFC3280CertPathUtilities.processCertF(certPath, index, validPolicyTree, explicitPolicy);
//
// 6.1.4
//
if (i != n)
{
if (cert != null && cert.getVersion() == 1)
{
throw new CertPathValidatorException("Version 1 certificates can't be used as CA ones.", null,
certPath, index);
}
RFC3280CertPathUtilities.prepareNextCertA(certPath, index);
validPolicyTree = RFC3280CertPathUtilities.prepareCertB(certPath, index, policyNodes, validPolicyTree,
policyMapping);
RFC3280CertPathUtilities.prepareNextCertG(certPath, index, nameConstraintValidator);
// (h)
explicitPolicy = RFC3280CertPathUtilities.prepareNextCertH1(certPath, index, explicitPolicy);
policyMapping = RFC3280CertPathUtilities.prepareNextCertH2(certPath, index, policyMapping);
inhibitAnyPolicy = RFC3280CertPathUtilities.prepareNextCertH3(certPath, index, inhibitAnyPolicy);
//
// (i)
//
explicitPolicy = RFC3280CertPathUtilities.prepareNextCertI1(certPath, index, explicitPolicy);
policyMapping = RFC3280CertPathUtilities.prepareNextCertI2(certPath, index, policyMapping);
// (j)
inhibitAnyPolicy = RFC3280CertPathUtilities.prepareNextCertJ(certPath, index, inhibitAnyPolicy);
// (k)
RFC3280CertPathUtilities.prepareNextCertK(certPath, index);
// (l)
maxPathLength = RFC3280CertPathUtilities.prepareNextCertL(certPath, index, maxPathLength);
// (m)
maxPathLength = RFC3280CertPathUtilities.prepareNextCertM(certPath, index, maxPathLength);
// (n)
RFC3280CertPathUtilities.prepareNextCertN(certPath, index);
Set criticalExtensions = cert.getCriticalExtensionOIDs();
if (criticalExtensions != null)
{
criticalExtensions = new HashSet(criticalExtensions);
// these extensions are handled by the algorithm
criticalExtensions.remove(RFC3280CertPathUtilities.KEY_USAGE);
criticalExtensions.remove(RFC3280CertPathUtilities.CERTIFICATE_POLICIES);
criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_MAPPINGS);
criticalExtensions.remove(RFC3280CertPathUtilities.INHIBIT_ANY_POLICY);
criticalExtensions.remove(RFC3280CertPathUtilities.ISSUING_DISTRIBUTION_POINT);
criticalExtensions.remove(RFC3280CertPathUtilities.DELTA_CRL_INDICATOR);
criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_CONSTRAINTS);
criticalExtensions.remove(RFC3280CertPathUtilities.BASIC_CONSTRAINTS);
criticalExtensions.remove(RFC3280CertPathUtilities.SUBJECT_ALTERNATIVE_NAME);
criticalExtensions.remove(RFC3280CertPathUtilities.NAME_CONSTRAINTS);
}
else
{
criticalExtensions = new HashSet();
}
// (o)
RFC3280CertPathUtilities.prepareNextCertO(certPath, index, criticalExtensions, pathCheckers);
// set signing certificate for next round
sign = cert;
// (c)
workingIssuerName = PrincipalUtils.getSubjectPrincipal(sign);
// (d)
try
{
workingPublicKey = CertPathValidatorUtilities.getNextWorkingKey(certPath.getCertificates(), index, helper);
}
catch (CertPathValidatorException e)
{
throw new CertPathValidatorException("Next working key could not be retrieved.", e, certPath, index);
}
workingAlgId = CertPathValidatorUtilities.getAlgorithmIdentifier(workingPublicKey);
// (f)
workingPublicKeyAlgorithm = workingAlgId.getAlgorithm();
// (e)
workingPublicKeyParameters = workingAlgId.getParameters();
}
}
//
// 6.1.5 Wrap-up procedure
//
explicitPolicy = RFC3280CertPathUtilities.wrapupCertA(explicitPolicy, cert);
explicitPolicy = RFC3280CertPathUtilities.wrapupCertB(certPath, index + 1, explicitPolicy);
//
// (c) (d) and (e) are already done
//
//
// (f)
//
Set criticalExtensions = cert.getCriticalExtensionOIDs();
if (criticalExtensions != null)
{
criticalExtensions = new HashSet(criticalExtensions);
// these extensions are handled by the algorithm
criticalExtensions.remove(RFC3280CertPathUtilities.KEY_USAGE);
criticalExtensions.remove(RFC3280CertPathUtilities.CERTIFICATE_POLICIES);
criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_MAPPINGS);
criticalExtensions.remove(RFC3280CertPathUtilities.INHIBIT_ANY_POLICY);
criticalExtensions.remove(RFC3280CertPathUtilities.ISSUING_DISTRIBUTION_POINT);
criticalExtensions.remove(RFC3280CertPathUtilities.DELTA_CRL_INDICATOR);
criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_CONSTRAINTS);
criticalExtensions.remove(RFC3280CertPathUtilities.BASIC_CONSTRAINTS);
criticalExtensions.remove(RFC3280CertPathUtilities.SUBJECT_ALTERNATIVE_NAME);
criticalExtensions.remove(RFC3280CertPathUtilities.NAME_CONSTRAINTS);
criticalExtensions.remove(RFC3280CertPathUtilities.CRL_DISTRIBUTION_POINTS);
criticalExtensions.remove(Extension.extendedKeyUsage.getId());
}
else
{
criticalExtensions = new HashSet();
}
RFC3280CertPathUtilities.wrapupCertF(certPath, index + 1, pathCheckers, criticalExtensions);
PKIXPolicyNode intersection = RFC3280CertPathUtilities.wrapupCertG(certPath, paramsPKIX, userInitialPolicySet,
index + 1, policyNodes, validPolicyTree, acceptablePolicies);
if ((explicitPolicy > 0) || (intersection != null))
{
return new PKIXCertPathValidatorResult(trust, intersection, cert.getPublicKey());
}
throw new CertPathValidatorException("Path processing failed on policy.", null, certPath, index);
}
}
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