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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 1.6.
package org.bouncycastle.jce.provider;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.x509.CRLDistPoint;
import org.bouncycastle.asn1.x509.CRLReason;
import org.bouncycastle.asn1.x509.DistributionPoint;
import org.bouncycastle.asn1.x509.DistributionPointName;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.asn1.x509.TargetInformation;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.jce.exception.ExtCertPathValidatorException;
import org.bouncycastle.x509.ExtendedPKIXBuilderParameters;
import org.bouncycastle.x509.ExtendedPKIXParameters;
import org.bouncycastle.x509.PKIXAttrCertChecker;
import org.bouncycastle.x509.X509AttributeCertificate;
import org.bouncycastle.x509.X509CertStoreSelector;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Principal;
import java.security.PublicKey;
import java.security.cert.CertPath;
import java.security.cert.CertPathBuilder;
import java.security.cert.CertPathBuilderException;
import java.security.cert.CertPathBuilderResult;
import java.security.cert.CertPathValidator;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertPathValidatorResult;
import java.security.cert.CertificateExpiredException;
import java.security.cert.CertificateNotYetValidException;
import java.security.cert.TrustAnchor;
import java.security.cert.X509CRL;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.security.auth.x500.X500Principal;
class RFC3281CertPathUtilities
{
private static final String TARGET_INFORMATION = X509Extensions.TargetInformation
.getId();
private static final String NO_REV_AVAIL = X509Extensions.NoRevAvail
.getId();
private static final String CRL_DISTRIBUTION_POINTS = X509Extensions.CRLDistributionPoints
.getId();
private static final String AUTHORITY_INFO_ACCESS = X509Extensions.AuthorityInfoAccess
.getId();
protected static void processAttrCert7(X509AttributeCertificate attrCert,
CertPath certPath, CertPath holderCertPath,
ExtendedPKIXParameters pkixParams) throws CertPathValidatorException
{
// TODO:
// AA Controls
// Attribute encryption
// Proxy
Set set = attrCert.getCriticalExtensionOIDs();
// 7.1
// process extensions
// target information checked in step 6 / X509AttributeCertStoreSelector
if (set.contains(TARGET_INFORMATION))
{
try
{
TargetInformation.getInstance(CertPathValidatorUtilities
.getExtensionValue(attrCert, TARGET_INFORMATION));
}
catch (AnnotatedException e)
{
throw new ExtCertPathValidatorException(
"Target information extension could not be read.", e);
}
catch (IllegalArgumentException e)
{
throw new ExtCertPathValidatorException(
"Target information extension could not be read.", e);
}
}
set.remove(TARGET_INFORMATION);
for (Iterator it = pkixParams.getAttrCertCheckers().iterator(); it
.hasNext();)
{
((PKIXAttrCertChecker) it.next()).check(attrCert, certPath,
holderCertPath, set);
}
if (!set.isEmpty())
{
throw new CertPathValidatorException(
"Attribute certificate contains unsupported critical extensions: "
+ set);
}
}
/**
* Checks if an attribute certificate is revoked.
*
* @param attrCert Attribute certificate to check if it is revoked.
* @param paramsPKIX PKIX parameters.
* @param issuerCert The issuer certificate of the attribute certificate
* attrCert.
* @param validDate The date when the certificate revocation status should
* be checked.
* @param certPathCerts The certificates of the certification path to be
* checked.
*
* @throws CertPathValidatorException if the certificate is revoked or the
* status cannot be checked or some error occurs.
*/
protected static void checkCRLs(X509AttributeCertificate attrCert,
ExtendedPKIXParameters paramsPKIX, X509Certificate issuerCert,
Date validDate, List certPathCerts) throws CertPathValidatorException
{
if (paramsPKIX.isRevocationEnabled())
{
// check if revocation is available
if (attrCert.getExtensionValue(NO_REV_AVAIL) == null)
{
CRLDistPoint crldp = null;
try
{
crldp = CRLDistPoint.getInstance(CertPathValidatorUtilities
.getExtensionValue(attrCert, CRL_DISTRIBUTION_POINTS));
}
catch (AnnotatedException e)
{
throw new CertPathValidatorException(
"CRL distribution point extension could not be read.",
e);
}
try
{
CertPathValidatorUtilities
.addAdditionalStoresFromCRLDistributionPoint(crldp,
paramsPKIX);
}
catch (AnnotatedException e)
{
throw new CertPathValidatorException(
"No additional CRL locations could be decoded from CRL distribution point extension.",
e);
}
CertStatus certStatus = new CertStatus();
ReasonsMask reasonsMask = new ReasonsMask();
AnnotatedException lastException = null;
boolean validCrlFound = false;
// for each distribution point
if (crldp != null)
{
DistributionPoint dps[] = null;
try
{
dps = crldp.getDistributionPoints();
}
catch (Exception e)
{
throw new ExtCertPathValidatorException(
"Distribution points could not be read.", e);
}
try
{
for (int i = 0; i < dps.length
&& certStatus.getCertStatus() == CertStatus.UNREVOKED
&& !reasonsMask.isAllReasons(); i++)
{
ExtendedPKIXParameters paramsPKIXClone = (ExtendedPKIXParameters) paramsPKIX
.clone();
checkCRL(dps[i], attrCert, paramsPKIXClone,
validDate, issuerCert, certStatus, reasonsMask,
certPathCerts);
validCrlFound = true;
}
}
catch (AnnotatedException e)
{
lastException = new AnnotatedException(
"No valid CRL for distribution point found.", e);
}
}
/*
* If the revocation status has not been determined, repeat the
* process above with any available CRLs not specified in a
* distribution point but issued by the certificate issuer.
*/
if (certStatus.getCertStatus() == CertStatus.UNREVOKED
&& !reasonsMask.isAllReasons())
{
try
{
/*
* assume a DP with both the reasons and the cRLIssuer
* fields omitted and a distribution point name of the
* certificate issuer.
*/
DERObject issuer = null;
try
{
issuer = new ASN1InputStream(
((X500Principal) attrCert.getIssuer()
.getPrincipals()[0]).getEncoded())
.readObject();
}
catch (Exception e)
{
throw new AnnotatedException(
"Issuer from certificate for CRL could not be reencoded.",
e);
}
DistributionPoint dp = new DistributionPoint(
new DistributionPointName(0, new GeneralNames(
new GeneralName(GeneralName.directoryName,
issuer))), null, null);
ExtendedPKIXParameters paramsPKIXClone = (ExtendedPKIXParameters) paramsPKIX
.clone();
checkCRL(dp, attrCert, paramsPKIXClone, validDate,
issuerCert, certStatus, reasonsMask, certPathCerts);
validCrlFound = true;
}
catch (AnnotatedException e)
{
lastException = new AnnotatedException(
"No valid CRL for distribution point found.", e);
}
}
if (!validCrlFound)
{
throw new ExtCertPathValidatorException(
"No valid CRL found.", lastException);
}
if (certStatus.getCertStatus() != CertStatus.UNREVOKED)
{
String message = "Attribute certificate revocation after "
+ certStatus.getRevocationDate();
message += ", reason: "
+ RFC3280CertPathUtilities.crlReasons[certStatus
.getCertStatus()];
throw new CertPathValidatorException(message);
}
if (!reasonsMask.isAllReasons()
&& certStatus.getCertStatus() == CertStatus.UNREVOKED)
{
certStatus.setCertStatus(CertStatus.UNDETERMINED);
}
if (certStatus.getCertStatus() == CertStatus.UNDETERMINED)
{
throw new CertPathValidatorException(
"Attribute certificate status could not be determined.");
}
}
else
{
if (attrCert.getExtensionValue(CRL_DISTRIBUTION_POINTS) != null
|| attrCert.getExtensionValue(AUTHORITY_INFO_ACCESS) != null)
{
throw new CertPathValidatorException(
"No rev avail extension is set, but also an AC revocation pointer.");
}
}
}
}
protected static void additionalChecks(X509AttributeCertificate attrCert,
ExtendedPKIXParameters pkixParams) throws CertPathValidatorException
{
// 1
for (Iterator it = pkixParams.getProhibitedACAttributes().iterator(); it
.hasNext();)
{
String oid = (String) it.next();
if (attrCert.getAttributes(oid) != null)
{
throw new CertPathValidatorException(
"Attribute certificate contains prohibited attribute: "
+ oid + ".");
}
}
for (Iterator it = pkixParams.getNecessaryACAttributes().iterator(); it
.hasNext();)
{
String oid = (String) it.next();
if (attrCert.getAttributes(oid) == null)
{
throw new CertPathValidatorException(
"Attribute certificate does not contain necessary attribute: "
+ oid + ".");
}
}
}
protected static void processAttrCert5(X509AttributeCertificate attrCert,
ExtendedPKIXParameters pkixParams) throws CertPathValidatorException
{
try
{
attrCert.checkValidity(CertPathValidatorUtilities
.getValidDate(pkixParams));
}
catch (CertificateExpiredException e)
{
throw new ExtCertPathValidatorException(
"Attribute certificate is not valid.", e);
}
catch (CertificateNotYetValidException e)
{
throw new ExtCertPathValidatorException(
"Attribute certificate is not valid.", e);
}
}
protected static void processAttrCert4(X509Certificate acIssuerCert,
ExtendedPKIXParameters pkixParams) throws CertPathValidatorException
{
Set set = pkixParams.getTrustedACIssuers();
boolean trusted = false;
for (Iterator it = set.iterator(); it.hasNext();)
{
TrustAnchor anchor = (TrustAnchor) it.next();
if (acIssuerCert.getSubjectX500Principal().getName("RFC2253")
.equals(anchor.getCAName())
|| acIssuerCert.equals(anchor.getTrustedCert()))
{
trusted = true;
}
}
if (!trusted)
{
throw new CertPathValidatorException(
"Attribute certificate issuer is not directly trusted.");
}
}
protected static void processAttrCert3(X509Certificate acIssuerCert,
ExtendedPKIXParameters pkixParams) throws CertPathValidatorException
{
if (acIssuerCert.getKeyUsage() != null
&& (!acIssuerCert.getKeyUsage()[0] && !acIssuerCert.getKeyUsage()[1]))
{
throw new CertPathValidatorException(
"Attribute certificate issuer public key cannot be used to validate digital signatures.");
}
if (acIssuerCert.getBasicConstraints() != -1)
{
throw new CertPathValidatorException(
"Attribute certificate issuer is also a public key certificate issuer.");
}
}
protected static CertPathValidatorResult processAttrCert2(
CertPath certPath, ExtendedPKIXParameters pkixParams)
throws CertPathValidatorException
{
CertPathValidator validator = null;
try
{
validator = CertPathValidator.getInstance("PKIX", "BC");
}
catch (NoSuchProviderException e)
{
throw new ExtCertPathValidatorException(
"Support class could not be created.", e);
}
catch (NoSuchAlgorithmException e)
{
throw new ExtCertPathValidatorException(
"Support class could not be created.", e);
}
try
{
return validator.validate(certPath, pkixParams);
}
catch (CertPathValidatorException e)
{
throw new ExtCertPathValidatorException(
"Certification path for issuer certificate of attribute certificate could not be validated.",
e);
}
catch (InvalidAlgorithmParameterException e)
{
// must be a programming error
throw new RuntimeException(e.getMessage());
}
}
/**
* Searches for a holder public key certificate and verifies its
* certification path.
*
* @param attrCert the attribute certificate.
* @param pkixParams The PKIX parameters.
* @return The certificate path of the holder certificate.
* @throws AnnotatedException if
*
* - no public key certificate can be found although holder
* information is given by an entity name or a base certificate
* ID
*
- support classes cannot be created
*
- no certification path for the public key certificate can
* be built
*
*/
protected static CertPath processAttrCert1(
X509AttributeCertificate attrCert, ExtendedPKIXParameters pkixParams)
throws CertPathValidatorException
{
CertPathBuilderResult result = null;
// find holder PKCs
Set holderPKCs = new HashSet();
if (attrCert.getHolder().getIssuer() != null)
{
X509CertStoreSelector selector = new X509CertStoreSelector();
selector.setSerialNumber(attrCert.getHolder().getSerialNumber());
Principal[] principals = attrCert.getHolder().getIssuer();
for (int i = 0; i < principals.length; i++)
{
try
{
if (principals[i] instanceof X500Principal)
{
selector.setIssuer(((X500Principal)principals[i])
.getEncoded());
}
holderPKCs.addAll(CertPathValidatorUtilities
.findCertificates(selector, pkixParams.getStores()));
}
catch (AnnotatedException e)
{
throw new ExtCertPathValidatorException(
"Public key certificate for attribute certificate cannot be searched.",
e);
}
catch (IOException e)
{
throw new ExtCertPathValidatorException(
"Unable to encode X500 principal.", e);
}
}
if (holderPKCs.isEmpty())
{
throw new CertPathValidatorException(
"Public key certificate specified in base certificate ID for attribute certificate cannot be found.");
}
}
if (attrCert.getHolder().getEntityNames() != null)
{
X509CertStoreSelector selector = new X509CertStoreSelector();
Principal[] principals = attrCert.getHolder().getEntityNames();
for (int i = 0; i < principals.length; i++)
{
try
{
if (principals[i] instanceof X500Principal)
{
selector.setIssuer(((X500Principal) principals[i])
.getEncoded());
}
holderPKCs.addAll(CertPathValidatorUtilities
.findCertificates(selector, pkixParams.getStores()));
}
catch (AnnotatedException e)
{
throw new ExtCertPathValidatorException(
"Public key certificate for attribute certificate cannot be searched.",
e);
}
catch (IOException e)
{
throw new ExtCertPathValidatorException(
"Unable to encode X500 principal.", e);
}
}
if (holderPKCs.isEmpty())
{
throw new CertPathValidatorException(
"Public key certificate specified in entity name for attribute certificate cannot be found.");
}
}
// verify cert paths for PKCs
ExtendedPKIXBuilderParameters params = (ExtendedPKIXBuilderParameters) ExtendedPKIXBuilderParameters
.getInstance(pkixParams);
CertPathValidatorException lastException = null;
for (Iterator it = holderPKCs.iterator(); it.hasNext();)
{
X509CertStoreSelector selector = new X509CertStoreSelector();
selector.setCertificate((X509Certificate) it.next());
params.setTargetConstraints(selector);
CertPathBuilder builder = null;
try
{
builder = CertPathBuilder.getInstance("PKIX", "BC");
}
catch (NoSuchProviderException e)
{
throw new ExtCertPathValidatorException(
"Support class could not be created.", e);
}
catch (NoSuchAlgorithmException e)
{
throw new ExtCertPathValidatorException(
"Support class could not be created.", e);
}
try
{
result = builder.build(ExtendedPKIXBuilderParameters
.getInstance(params));
}
catch (CertPathBuilderException e)
{
lastException = new ExtCertPathValidatorException(
"Certification path for public key certificate of attribute certificate could not be build.",
e);
}
catch (InvalidAlgorithmParameterException e)
{
// must be a programming error
throw new RuntimeException(e.getMessage());
}
}
if (lastException != null)
{
throw lastException;
}
return result.getCertPath();
}
/**
*
* Checks a distribution point for revocation information for the
* certificate attrCert.
*
* @param dp The distribution point to consider.
* @param attrCert The attribute certificate which should be checked.
* @param paramsPKIX PKIX parameters.
* @param validDate The date when the certificate revocation status should
* be checked.
* @param issuerCert Certificate to check if it is revoked.
* @param reasonMask The reasons mask which is already checked.
* @param certPathCerts The certificates of the certification path to be
* checked.
* @throws AnnotatedException if the certificate is revoked or the status
* cannot be checked or some error occurs.
*/
private static void checkCRL(DistributionPoint dp,
X509AttributeCertificate attrCert, ExtendedPKIXParameters paramsPKIX,
Date validDate, X509Certificate issuerCert, CertStatus certStatus,
ReasonsMask reasonMask, List certPathCerts) throws AnnotatedException
{
/*
* 4.3.6 No Revocation Available
*
* The noRevAvail extension, defined in [X.509-2000], allows an AC
* issuer to indicate that no revocation information will be made
* available for this AC.
*/
if (attrCert.getExtensionValue(X509Extensions.NoRevAvail.getId()) != null)
{
return;
}
Date currentDate = new Date(System.currentTimeMillis());
if (validDate.getTime() > currentDate.getTime())
{
throw new AnnotatedException("Validation time is in future.");
}
// (a)
/*
* We always get timely valid CRLs, so there is no step (a) (1).
* "locally cached" CRLs are assumed to be in getStore(), additional
* CRLs must be enabled in the ExtendedPKIXParameters and are in
* getAdditionalStore()
*/
Set crls = CertPathValidatorUtilities.getCompleteCRLs(dp, attrCert,
currentDate, paramsPKIX);
boolean validCrlFound = false;
AnnotatedException lastException = null;
Iterator crl_iter = crls.iterator();
while (crl_iter.hasNext()
&& certStatus.getCertStatus() == CertStatus.UNREVOKED
&& !reasonMask.isAllReasons())
{
try
{
X509CRL crl = (X509CRL) crl_iter.next();
// (d)
ReasonsMask interimReasonsMask = RFC3280CertPathUtilities
.processCRLD(crl, dp);
// (e)
/*
* The reasons mask is updated at the end, so only valid CRLs
* can update it. If this CRL does not contain new reasons it
* must be ignored.
*/
if (!interimReasonsMask.hasNewReasons(reasonMask))
{
continue;
}
// (f)
Set keys = RFC3280CertPathUtilities.processCRLF(crl, attrCert,
null, null, paramsPKIX, certPathCerts);
// (g)
PublicKey key = RFC3280CertPathUtilities.processCRLG(crl, keys);
X509CRL deltaCRL = null;
if (paramsPKIX.isUseDeltasEnabled())
{
// get delta CRLs
Set deltaCRLs = CertPathValidatorUtilities.getDeltaCRLs(
currentDate, paramsPKIX, crl);
// we only want one valid delta CRL
// (h)
deltaCRL = RFC3280CertPathUtilities.processCRLH(deltaCRLs,
key);
}
/*
* CRL must be be valid at the current time, not the validation
* time. If a certificate is revoked with reason keyCompromise,
* cACompromise, it can be used for forgery, also for the past.
* This reason may not be contained in older CRLs.
*/
/*
* in the chain model signatures stay valid also after the
* certificate has been expired, so they do not have to be in
* the CRL vality time
*/
if (paramsPKIX.getValidityModel() != ExtendedPKIXParameters.CHAIN_VALIDITY_MODEL)
{
/*
* if a certificate has expired, but was revoked, it is not
* more in the CRL, so it would be regarded as valid if the
* first check is not done
*/
if (attrCert.getNotAfter().getTime() < crl.getThisUpdate()
.getTime())
{
throw new AnnotatedException(
"No valid CRL for current time found.");
}
}
RFC3280CertPathUtilities.processCRLB1(dp, attrCert, crl);
// (b) (2)
RFC3280CertPathUtilities.processCRLB2(dp, attrCert, crl);
// (c)
RFC3280CertPathUtilities.processCRLC(deltaCRL, crl, paramsPKIX);
// (i)
RFC3280CertPathUtilities.processCRLI(validDate, deltaCRL,
attrCert, certStatus, paramsPKIX);
// (j)
RFC3280CertPathUtilities.processCRLJ(validDate, crl, attrCert,
certStatus);
// (k)
if (certStatus.getCertStatus() == CRLReason.removeFromCRL)
{
certStatus.setCertStatus(CertStatus.UNREVOKED);
}
// update reasons mask
reasonMask.addReasons(interimReasonsMask);
validCrlFound = true;
}
catch (AnnotatedException e)
{
lastException = e;
}
}
if (!validCrlFound)
{
throw lastException;
}
}
}