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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.network.crypto;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.security.sasl.Sasl;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Throwables;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.spark.network.client.RpcResponseCallback;
import org.apache.spark.network.client.TransportClient;
import org.apache.spark.network.sasl.SecretKeyHolder;
import org.apache.spark.network.sasl.SaslRpcHandler;
import org.apache.spark.network.server.RpcHandler;
import org.apache.spark.network.server.StreamManager;
import org.apache.spark.network.util.JavaUtils;
import org.apache.spark.network.util.TransportConf;
/**
* RPC Handler which performs authentication using Spark's auth protocol before delegating to a
* child RPC handler. If the configuration allows, this handler will delegate messages to a SASL
* RPC handler for further authentication, to support for clients that do not support Spark's
* protocol.
*
* The delegate will only receive messages if the given connection has been successfully
* authenticated. A connection may be authenticated at most once.
*/
class AuthRpcHandler extends RpcHandler {
private static final Logger LOG = LoggerFactory.getLogger(AuthRpcHandler.class);
/** Transport configuration. */
private final TransportConf conf;
/** The client channel. */
private final Channel channel;
/**
* RpcHandler we will delegate to for authenticated connections. When falling back to SASL
* this will be replaced with the SASL RPC handler.
*/
@VisibleForTesting
RpcHandler delegate;
/** Class which provides secret keys which are shared by server and client on a per-app basis. */
private final SecretKeyHolder secretKeyHolder;
/** Whether auth is done and future calls should be delegated. */
@VisibleForTesting
boolean doDelegate;
AuthRpcHandler(
TransportConf conf,
Channel channel,
RpcHandler delegate,
SecretKeyHolder secretKeyHolder) {
this.conf = conf;
this.channel = channel;
this.delegate = delegate;
this.secretKeyHolder = secretKeyHolder;
}
@Override
public void receive(TransportClient client, ByteBuffer message, RpcResponseCallback callback) {
if (doDelegate) {
delegate.receive(client, message, callback);
return;
}
int position = message.position();
int limit = message.limit();
ClientChallenge challenge;
try {
challenge = ClientChallenge.decodeMessage(message);
LOG.debug("Received new auth challenge for client {}.", channel.remoteAddress());
} catch (RuntimeException e) {
if (conf.saslFallback()) {
LOG.warn("Failed to parse new auth challenge, reverting to SASL for client {}.",
channel.remoteAddress());
delegate = new SaslRpcHandler(conf, channel, delegate, secretKeyHolder);
message.position(position);
message.limit(limit);
delegate.receive(client, message, callback);
doDelegate = true;
} else {
LOG.debug("Unexpected challenge message from client {}, closing channel.",
channel.remoteAddress());
callback.onFailure(new IllegalArgumentException("Unknown challenge message."));
channel.close();
}
return;
}
// Here we have the client challenge, so perform the new auth protocol and set up the channel.
AuthEngine engine = null;
try {
engine = new AuthEngine(challenge.appId, secretKeyHolder.getSecretKey(challenge.appId), conf);
ServerResponse response = engine.respond(challenge);
ByteBuf responseData = Unpooled.buffer(response.encodedLength());
response.encode(responseData);
callback.onSuccess(responseData.nioBuffer());
engine.sessionCipher().addToChannel(channel);
} catch (Exception e) {
// This is a fatal error: authentication has failed. Close the channel explicitly.
LOG.debug("Authentication failed for client {}, closing channel.", channel.remoteAddress());
callback.onFailure(new IllegalArgumentException("Authentication failed."));
channel.close();
return;
} finally {
if (engine != null) {
try {
engine.close();
} catch (Exception e) {
throw Throwables.propagate(e);
}
}
}
LOG.debug("Authorization successful for client {}.", channel.remoteAddress());
doDelegate = true;
}
@Override
public void receive(TransportClient client, ByteBuffer message) {
delegate.receive(client, message);
}
@Override
public StreamManager getStreamManager() {
return delegate.getStreamManager();
}
@Override
public void channelActive(TransportClient client) {
delegate.channelActive(client);
}
@Override
public void channelInactive(TransportClient client) {
delegate.channelInactive(client);
}
@Override
public void exceptionCaught(Throwable cause, TransportClient client) {
delegate.exceptionCaught(cause, client);
}
}
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