realm: W2K19SINGLE.SPRINGFIELD
                    sname
                        name-type: kRB5-NT-UNKNOWN (0)
                        sname-string: 2 items
                            SNameString: cifs
                            SNameString: fakeserver.w2k19single.springfield
                    enc-part
                        etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                        kvno: 5

         * technique that NTLMv2 specifically thwarts. A real NTLM Filter would
         * need to do a NETLOGON RPC that JCIFS will likely never implement
         * because it requires a lot of extra crypto not used by CIFS.
         */
        p.setProperty("jcifs.smb.lmCompatibility", "0");
        p.setProperty("jcifs.smb.client.useExtendedSecurity", "false");

        Enumeration<String> e = filterConfig.getInitParameterNames();

         * techinque that NTLMv2 specifically thwarts. A real NTLM Filter would
         * need to do a NETLOGON RPC that JCIFS will likely never implement
         * because it requires a lot of extra crypto not used by CIFS.
         */
        Config.setProperty( "jcifs.smb1.smb.lmCompatibility", "0" );
        Config.setProperty( "jcifs.smb1.smb.client.useExtendedSecurity", "false" );

    private static final long serialVersionUID = 1999400043787454432L;
    private static final Logger log = LoggerFactory.getLogger(Kerb5Authenticator.class);
    private static final String DEFAULT_SERVICE = "cifs";

    private static final Set<ASN1ObjectIdentifier> PREFERRED_MECHS = new HashSet<>();

    private Subject subject = null;
    private String user = null;
    private String realm = null;

    private static SSPContext setupTargetName ( CIFSContext tc, String host, NtlmContext ntlmContext ) {
        if ( host != null && tc.getConfig().isSendNTLMTargetName() ) {
            ntlmContext.setTargetName(String.format("cifs/%s", host));
        }
        return ntlmContext;
    }


    @Override
    public NtlmPasswordAuthenticator clone () {
        NtlmPasswordAuthenticator cloned = new NtlmPasswordAuthenticator();

            this.transportContext = new BaseContext(new PropertyConfiguration(p));
        }
        catch ( CIFSException ex ) {
            throw new ServletException("Failed to initialize CIFS context", ex);
        }
    }


    protected void doFile ( HttpServletRequest req, HttpServletResponse resp, SmbFile file ) throws IOException {
        byte[] buf = new byte[8192];