Authenticates users who access {@link DefaultPartitionNexus}.
{@link Authenticator}s are registered to and configured by {@link AuthenticationInterceptor} interceptor.
{@link AuthenticationInterceptor} authenticates users by calling{@link #authenticate(DN,ServerContext)}, and then {@link Authenticator}checks JNDI {@link Context} environment properties( {@link Context#SECURITY_PRINCIPAL} and {@link Context#SECURITY_CREDENTIALS}) of current {@link Context}.
@see AbstractAuthenticator
@author Apache Directory Project
@version $Rev: 918766 $