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Flume >> mail # user >> Authentication - Avro Source, Sink, RpcClient

Rakos, Rudolf 2013-01-23, 11:45
Mike Percy 2013-01-23, 20:16
Rakos, Rudolf 2013-01-25, 14:07
Mike Percy 2013-02-05, 08:33
Rakos, Rudolf 2013-02-05, 10:50
Mike Percy 2013-02-05, 14:45
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RE: Authentication - Avro Source, Sink, RpcClient

I don’t think I have approval to do that.
We’ve customized / extended many small things in Flume, and there’s just too much proprietary code / libraries involved.

I’m really sorry. :(

I would be happy if I could help with implementing SASL properly.


From: Mike Percy [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 05, 2013 3:45 PM
Subject: Re: Authentication - Avro Source, Sink, RpcClient

Rudolf, wow interesting! So it's working, huh? Can you submit a patch?


On Tuesday, February 5, 2013, Rakos, Rudolf wrote:
Yes, I think so.

I had to make 4 small changes.
Unfortunately I couldn’t subclass these classes, but I could reuse most of the code.
•         First I added an “auth” configuration option to AvroSource and AvroSink, to be able to enable / disable authentication.

•         AvroSource#start()

Responder responder = new SpecificResponder(AvroSourceProtocol.class, this);
if (auth) {
    responder.addRPCPlugin(new AuthenticatorRPCPlugin());

•         AvroSink#createConnection()

Instead of using RpcClientFactory:
client = RpcClientFactory.getInstance(clientProps);

I create my own RpcClient (I didn’t want to modify RpcClientFactory):
client = new AuthNettyAvroRpcClient(auth, ...);

•         AuthNettyAvroRpcClient#connect(long, java.util.concurrent.TimeUnit)

Instead of getting a client using the Transceiver:
avroClient = SpecificRequestor.getClient(AvroSourceProtocol.Callback.class, transceiver);

I get a client using a Requestor:
SpecificRequestor requestor = new SpecificRequestor(AvroSourceProtocol.Callback.class, transceiver);
if (auth) {
    requestor.addRPCPlugin(new AuthenticatorRPCPlugin());
avroClient = SpecificRequestor.getClient(AvroSourceProtocol.Callback.class, requestor);

The AuthenticatorRPCPlugin is an org.apache.avro.ipc.RPCPlugin with 3 methods overriden to exchange the authentication data during the Avro handshake:

1.       clientStartConnect(org.apache.avro.ipc.RPCContext)
This is called on the client, before the handshake.

2.       serverConnecting(org.apache.avro.ipc.RPCContext)
This is called on the server. The connection will be aborted, if an exception is thrown here.

3.       clientFinishConnect(org.apache.avro.ipc.RPCContext)
This is called on the client, after the handshake.
The org.apache.avro.ipc.RPCContext#getHandshakeRequest() returns an org.apache.avro.ipc.HandshakeRequest which contains a java.util.Map<java.lang.String, java.nio.ByteBuffer> where I could store the authentication data (org.apache.avro.ipc.HandshakeRequest#getMeta and org.apache.avro.ipc.HandshakeRequest#setMeta methods).

This might not be the nicest way to implement authentication, but this way it’s pretty much transparent to Flume.
I think it would be pretty easy to implement some kind of encryption too using the other org.apache.avro.ipc.RPCPlugin methods.


From: Mike Percy [mailto:[EMAIL PROTECTED]<javascript:_e(%7b%7d,%20'cvml',%20'[EMAIL PROTECTED]');>]
Sent: Tuesday, February 05, 2013 9:33 AM
To: [EMAIL PROTECTED]<javascript:_e(%7b%7d,%20'cvml',%20'[EMAIL PROTECTED]');>
Subject: Re: Authentication - Avro Source, Sink, RpcClient

Rudolf did you try it? Any luck?



On Friday, January 25, 2013, Rakos, Rudolf wrote:

I think that maybe it’s possible to use Avro RPCPlugins to inject authentication data during the Avro handshake.

Thanks for your help Mike.



From: Mike Percy [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 23, 2013 9:16 PM
Subject: Re: Authentication - Avro Source, Sink, RpcClient

I agree that AvroSource/Sink SASL and Kerberos auth would be really useful. It would need some work at the Avro level, though.

There is also the possibility of doing the same thing on top of Thrift, in which case it would require a brand new source/sink/client implementation but it wouldn't require any protocol work AFAICT.



On Wed, Jan 23, 2013 at 3:45 AM, Rakos, Rudolf <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:

Hi Flume Users,

We’d like to have authentication between Flume Nodes and Clients.

I believe that currently there’s no easy way to set up any kind of authentication between Avro Sources, Sinks, and RpcClients.

I would like to ask what would be the best way to extend Flume to support authentication?

Would it be enough to extend or rewrite Avro Source, Sink and RpcClient?

Does Avro or Netty support authentication?

We’d prefer using Kerberos or maybe SPNEGO, but I’m not sure what options do we have.

Thanks and regards,


Rudolf Rakos
Morgan Stanley | ISG Technology
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