Github user sudheeshkatkam commented on a diff in the pull request:

    https://github.com/apache/drill/pull/773#discussion_r109963000
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/ServerAuthenticationHandler.java
 ---
    @@ -251,25 +256,62 @@ void process(SaslResponseContext<S, T> context) 
throws Exception {
       private static <S extends ServerConnection<S>, T extends EnumLite>
       void handleSuccess(final SaslResponseContext<S, T> context, final 
SaslMessage.Builder challenge,
                          final SaslServer saslServer) throws IOException {
    -    context.connection.changeHandlerTo(context.requestHandler);
    -    context.connection.finalizeSaslSession();
    -    context.sender.send(new Response(context.saslResponseType, 
challenge.build()));
     
    -    // setup security layers here..
    +    final S connection = context.connection;
    +    connection.changeHandlerTo(context.requestHandler);
    +    connection.finalizeSaslSession();
    +    context.sender.send(new Response(context.saslResponseType, 
challenge.build()));
     
         if (logger.isTraceEnabled()) {
    -      logger.trace("Authenticated {} successfully using {} from {}", 
saslServer.getAuthorizationID(),
    -          saslServer.getMechanismName(), context.remoteAddress);
    +      logger.trace("Authenticated {} successfully using {} from {} with 
encryption context {}",
    +        saslServer.getAuthorizationID(), saslServer.getMechanismName(), 
connection.getRemoteAddress().toString(),
    +        connection.getEncryptionString());
    +    }
    +
    +    if (connection.isEncrypted()) {
    +      try {
    +        // Check if connection was marked for being secure then verify for 
negotiated QOP value for correctness.
    +        final String negotiatedQOP = 
saslServer.getNegotiatedProperty(Sasl.QOP).toString();
    +        assert 
(negotiatedQOP.equals(SaslProperties.QualityOfProtection.PRIVACY.getSaslQop()));
    +
    +        // Update the rawWrapSendSize with the negotiated rawSendSize 
since we cannot call encode with more than the
    +        // negotiated size of buffer
    +        final int negotiatedRawSendSize = Integer.parseInt(saslServer
    +                                                              
.getNegotiatedProperty(SaslProperties.WRAP_RAW_SEND_SIZE)
    +                                                              .toString());
    +        if(negotiatedRawSendSize <= 0) {
    +          throw new SaslException(String.format("Negotiated rawSendSize: 
%d is invalid. Please check the configured " +
    +            "value of sasl.encryption.encodesize. It might be configured 
to a very small value.",
    +            negotiatedRawSendSize));
    +        }
    +        connection.setRawWrapSendSize(negotiatedRawSendSize);
    +        connection.addSecurityHandlers();
    +      } catch (IllegalStateException | NumberFormatException e) {
    +        throw new SaslException(String.format("Unexpected failure while 
retrieving negotiated property values (%s)",
    --- End diff --
    
    This method does not follow [this 
contract](https://github.com/apache/drill/blob/master/exec/rpc/src/main/java/org/apache/drill/exec/rpc/RequestHandler.java#L34).
 Somehow the order of `context.sender.send(...)` and exceptions thrown (here 
and below) needs to be fixed.


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