Example usage for java.security.cert TrustAnchor getCAPublicKey

Introduction

In this page you can find the example usage for java.security.cert TrustAnchor getCAPublicKey.

Prototype

public final PublicKey getCAPublicKey() 

Source Link

Document

Returns the public key of the most-trusted CA.

Usage

From source file:mitm.common.security.crl.PKIXRevocationChecker.java

@Override
public RevocationResult getRevocationStatus(CertPath certPath, TrustAnchor trustAnchor, Date now)
        throws CRLException {
    Check.notNull(certPath, "certPath");
    Check.notNull(trustAnchor, "trustAnchor");

    List<? extends Certificate> certificates = certPath.getCertificates();

    RevocationResult revocationResult = new RevocationResultImpl(certificates.size());

    /* //from  www.j  a v  a  2 s. c  o m
     * Step through all the certificates in the path and check the revocation status of all
     * the certificates in the path.
     */
    for (int i = 0; i < certificates.size(); i++) {
        X509Certificate certificate = toX509Certificate(certificates.get(i));

        PublicKey issuerPublicKey;
        X500Principal issuer;
        X509Certificate issuerCertificate;

        /*
         * we need to get the issuer of the current certificate
         * check if there is a next certificate in the path or that we must use the TrustAnchor
         */
        if ((i + 1) == certificates.size()) {
            /* this was the last entry from the path so we must use the trust anchor */
            if (trustAnchor.getTrustedCert() != null) {
                issuerCertificate = toX509Certificate(trustAnchor.getTrustedCert());
                issuerPublicKey = issuerCertificate.getPublicKey();
                issuer = issuerCertificate.getSubjectX500Principal();
            } else {
                /* the TrustAnchor does not contain a certificate but only an issuer and public key */
                issuerCertificate = null;
                issuerPublicKey = trustAnchor.getCAPublicKey();
                issuer = trustAnchor.getCA();
            }
        } else {
            /* get next entry from path ie. the issuer of the current certificate */
            issuerCertificate = toX509Certificate(certificates.get(i + 1));
            issuerPublicKey = issuerCertificate.getPublicKey();
            issuer = issuerCertificate.getSubjectX500Principal();
        }

        /*
         * sanity check to make sure the CertPath is ordered from end -> final CA
         * ie that the next certificate signed the previous certificate
         */
        verifyCertificate(certificate, issuerPublicKey);

        /* 
         * Sanity check. The issuer principal field of the certificate currently checked should 
         * normally be equal to the issuer principal.
         */
        if (!certificate.getIssuerX500Principal().equals(issuer)) {
            logger.warn("Certificate issuer field is not equal to issuer.");
        }

        if (issuerCertificate != null) {
            Set<KeyUsageType> keyUsage = X509CertificateInspector.getKeyUsage(issuerCertificate);

            /* 
             * check if issuer is allowed to issue CRLs (only when we have an issuerCertificate, and
             * a key usage extension) 
             */
            if (keyUsage != null && !keyUsage.contains(KeyUsageType.CRLSIGN)) {
                logger.debug("Issuer is not allowed to issue CRLs.");

                /*
                 * We will return UNKNOWN status.
                 */
                RevocationDetailImpl detail = new RevocationDetailImpl(RevocationStatus.UNKNOWN);

                revocationResult.getDetails()[i] = detail;

                /* there is no need to continue because issuer is not allowed to issue CRLs */
                break;
            }
        }

        X509CRLSelector crlSelector = new X509CRLSelector();

        /* create a selector to find all relevant CRLs that were issued to the same issuer as the certificate */
        crlSelector.addIssuer(issuer);

        try {
            List<X509CRL> crls = findCRLs(certificate, crlSelector, issuerPublicKey, now);

            RevocationDetail detail = getRevocationDetail(crls, certificate, issuerCertificate, issuerPublicKey,
                    now);

            revocationResult.getDetails()[i] = detail;

            if (detail.getStatus() == RevocationStatus.REVOKED) {
                logger.warn("Certificate is revoked.");

                if (logger.isDebugEnabled()) {
                    logger.debug("Revoked certificate: " + certificate);
                }

                /* there is no need to continue because the CRL is revoked */
                break;
            }
        } catch (NoSuchProviderException e) {
            throw new NoSuchProviderRuntimeException(e);
        }
    }

    if (logger.isDebugEnabled()) {
        logger.debug("Revocation status for CertPath " + certPath + " and TrustAnchor " + trustAnchor + " is "
                + revocationResult);
    }

    return revocationResult;
}

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