this.contextLifetime = time;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.CredentialsInternal#isAnonymous()
     */
    @Override
    public boolean isAnonymous () {
        return this.getSubject() == null && super.isAnonymous();
    }


    /**
     * {@inheritDoc}
     *

        NtlmPasswordAuthenticator ntlmGuestCreds = guestCreds.unwrap(NtlmPasswordAuthenticator.class);
        assertThat("anonymous", ntlmGuestCreds.isAnonymous(), CoreMatchers.is(false));
        assertThat("guest", ntlmGuestCreds.isGuest(), CoreMatchers.is(true));

        Credentials anonCreds = this.context.withAnonymousCredentials().getCredentials();

        if ( server.security == SmbConstants.SECURITY_USER ) {
            if ( cred instanceof NtlmPasswordAuthenticator ) {
                NtlmPasswordAuthenticator a = (NtlmPasswordAuthenticator) cred;
                if ( a.isAnonymous() ) {
                    this.lmHash = new byte[0];
                    this.ntHash = new byte[0];
                    this.capabilities &= ~SmbConstants.CAP_EXTENDED_SECURITY;
                    if ( a.isGuest() ) {

                        && ! ( this.credentials.isGuest() || this.credentials.isAnonymous() ) ) {
                    throw new SmbAuthException(NtStatus.NT_STATUS_LOGON_FAILURE);
                }
                else if ( !this.credentials.isAnonymous() && response.isLoggedInAsGuest() ) {
                    anonymous = true;
                }

    /**
     * @return the domain the user account is in
     */
    String getUserDomain ();


    /**
     * @return whether these are anonymous credentials
     */
    boolean isAnonymous ();


    /**
     * @return whether these are guest credentials
     */
    boolean isGuest ();

        this.ntlmsspFlags = this.ntlmsspFlags | NtlmFlags.NTLMSSP_REQUEST_TARGET | NtlmFlags.NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY
                | NtlmFlags.NTLMSSP_NEGOTIATE_128;
        if ( !auth.isAnonymous() ) {
            this.ntlmsspFlags |= NtlmFlags.NTLMSSP_NEGOTIATE_SIGN | NtlmFlags.NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NtlmFlags.NTLMSSP_NEGOTIATE_KEY_EXCH;
        }
        else if ( auth.isGuest() ) {

        this.configuration = new StaticJAASConfiguration(properties);
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.Kerb5Authenticator#isAnonymous()
     */
    @Override
    public boolean isAnonymous () {
        return false;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.smb.NtlmPasswordAuthenticator#isGuest()
     */
    @Override

     *
     * @see jcifs.CIFSContext#hasDefaultCredentials()
     */
    @Override
    public boolean hasDefaultCredentials () {
        return this.getDefaultCredentials() != null && !this.getDefaultCredentials().isAnonymous();
    }


    /**
     * @return
     */
    protected abstract Credentials getDefaultCredentials ();


    /**
     * {@inheritDoc}
     *

        try ( SmbFile f = new SmbFile(url) ) {
            Credentials creds = f.getContext().getCredentials();

            assertFalse(creds.isAnonymous());
            assertFalse(creds.isGuest());
            assertTrue(creds instanceof NtlmPasswordAuthenticator);
            NtlmPasswordAuthenticator ntcreds = (NtlmPasswordAuthenticator) creds;

    public byte[] getChallenge ( CIFSContext tf, Address dc, int port ) throws SmbException {
        try ( SmbTransportInternal trans = tf.getTransportPool()
                .getSmbTransport(tf, dc, port, false, !tf.getCredentials().isAnonymous() && tf.getConfig().isIpcSigningEnforced())
                .unwrap(SmbTransportInternal.class) ) {
            trans.ensureConnected();
            return trans.getServerEncryptionKey();
        }