OCSP Revocation on client certificate

Question

How do I manually check for certificate revocation status in java using OCSP, given just a client's java.security.cert.X509Certificate? I can't see a clear way to do it.

Alternatively, can I make tomcat do it for me automatically, and how do you know your solution to be true?

Answer 1

I found a most excellent solution:

http://www.docjar.com/html/api/sun/security/provider/certpath/OCSP.java.html

        /**
   54    * This is a class that checks the revocation status of a certificate(s) using
   55    * OCSP. It is not a PKIXCertPathChecker and therefore can be used outside of
   56    * the CertPathValidator framework. It is useful when you want to
   57    * just check the revocation status of a certificate, and you don't want to
   58    * incur the overhead of validating all of the certificates in the
   59    * associated certificate chain.
   60    *
   61    * @author Sean Mullan
   62    */

It has a method check(X509Certificate clientCert, X509Certificate issuerCert) that does the trick!

Answer 2

It appears there is a patch for Tomcat here to enable ocsp validation.

If you choose to do it manually:

Security.setProperty("ocsp.enable", "true")

Or set it via a command-line argument. See here:

This property's value is either true or false. If true, OCSP checking is enabled when doing certificate revocation checking; if false or not set, OCSP checking is disabled.

And here's some code that I think works:

interface ValidationStrategy {
    boolean validate(X509Certificate certificate, CertPath certPath,
            PKIXParameters parameters) throws GeneralSecurityException;
}


class SunOCSPValidationStrategy implements ValidationStrategy {
    @Override
    public boolean validate(X509Certificate certificate, CertPath certPath,
            PKIXParameters parameters) throws GeneralSecurityException {
        try {
            CertPathValidator cpv = CertPathValidator.getInstance("PKIX");
            PKIXCertPathValidatorResult result = (PKIXCertPathValidatorResult) cpv
                    .validate(certPath, parameters);
            Signature.LOG.debug("Validation result is: " + result);
            return true; // if no exception is thrown
        } catch (CertPathValidatorException cpve) {

            // if the exception is (or is caused by)
            // CertificateRevokedException, return false;
            // otherwise re-throw, because this indicates a failure to perform
            // the validation
            Throwable cause = ExceptionUtils.getRootCause(cpve);
            Class<? extends Throwable> exceptionClass = cause != null ? cause.getClass()
                    : cpve.getClass();
            if (exceptionClass.getSimpleName().equals("CertificateRevokedException")) {
                return false;
            }
            throw cpve;
        }
    }

}