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https://issues.apache.org/jira/browse/DRILL-4280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856480#comment-15856480
 ] 

ASF GitHub Bot commented on DRILL-4280:
---------------------------------------

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

    https://github.com/apache/drill/pull/578#discussion_r99888092
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/rpc/control/ControlClient.java
 ---
    @@ -89,14 +90,48 @@ public MessageLite getResponseDefaultInstance(int 
rpcType) throws RpcException {
       }
     
       @Override
    -  protected Response handle(ControlConnection connection, int rpcType, 
ByteBuf pBody, ByteBuf dBody) throws RpcException {
    -    return handler.handle(connection, rpcType, pBody, dBody);
    +  protected void handle(ControlConnection connection, int rpcType, ByteBuf 
pBody, ByteBuf dBody,
    +                        ResponseSender sender) throws RpcException {
    +    connection.getCurrentHandler().handle(connection, rpcType, pBody, 
dBody, sender);
       }
     
       @Override
       protected void validateHandshake(BitControlHandshake handshake) throws 
RpcException {
         if (handshake.getRpcVersion() != ControlRpcConfig.RPC_VERSION) {
    -      throw new RpcException(String.format("Invalid rpc version.  Expected 
%d, actual %d.", handshake.getRpcVersion(), ControlRpcConfig.RPC_VERSION));
    +      throw new RpcException(String.format("Invalid rpc version.  Expected 
%d, actual %d.",
    +          handshake.getRpcVersion(), ControlRpcConfig.RPC_VERSION));
    +    }
    +
    +    if (handshake.getAuthenticationMechanismsCount() != 0) { // remote 
requires authentication
    +      if (config.getAuthProvider() == null) {
    +        throw new RpcException(String.format("Drillbit (%s) requires auth, 
but auth is not configured.",
    +            remoteEndpoint.getAddress()));
    +      }
    +      if 
(!handshake.getAuthenticationMechanismsList().contains(config.getAuthMechanismToUse()))
 {
    +        throw new RpcException(String.format("Drillbit (%s) does not 
support %s", remoteEndpoint.getAddress(),
    +            config.getAuthMechanismToUse()));
    +      }
    +
    +      final SaslClient saslClient;
    +      try {
    +        saslClient = config.getAuthProvider()
    --- End diff --
    
    why the config doesn't return directly the factory? it would make the code 
a bit simpler I guess (and probably no need then to expose the mechanism used 
from outside the config)


> Kerberos Authentication
> -----------------------
>
>                 Key: DRILL-4280
>                 URL: https://issues.apache.org/jira/browse/DRILL-4280
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Keys Botzum
>            Assignee: Sudheesh Katkam
>              Labels: security
>
> Drill should support Kerberos based authentication from clients. This means 
> that both the ODBC and JDBC drivers as well as the web/REST interfaces should 
> support inbound Kerberos. For Web this would most likely be SPNEGO while for 
> ODBC and JDBC this will be more generic Kerberos.
> Since Hive and much of Hadoop supports Kerberos there is a potential for a 
> lot of reuse of ideas if not implementation.
> Note that this is related to but not the same as 
> https://issues.apache.org/jira/browse/DRILL-3584 



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