org.apache.spark.network.sasl.SaslClientBootstrap.java Source code

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Here is the source code for org.apache.spark.network.sasl.SaslClientBootstrap.java

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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.sasl;

import java.io.IOException;
import java.nio.ByteBuffer;
import javax.security.sasl.Sasl;
import javax.security.sasl.SaslException;

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.TransportClient;
import org.apache.spark.network.client.TransportClientBootstrap;
import org.apache.spark.network.util.JavaUtils;
import org.apache.spark.network.util.TransportConf;

/**
 * Bootstraps a {@link TransportClient} by performing SASL authentication on the connection. The
 * server should be setup with a {@link SaslRpcHandler} with matching keys for the given appId.
 */
public class SaslClientBootstrap implements TransportClientBootstrap {
    private static final Logger logger = LoggerFactory.getLogger(SaslClientBootstrap.class);

    private final TransportConf conf;
    private final String appId;
    private final SecretKeyHolder secretKeyHolder;

    public SaslClientBootstrap(TransportConf conf, String appId, SecretKeyHolder secretKeyHolder) {
        this.conf = conf;
        this.appId = appId;
        this.secretKeyHolder = secretKeyHolder;
    }

    /**
     * Performs SASL authentication by sending a token, and then proceeding with the SASL
     * challenge-response tokens until we either successfully authenticate or throw an exception
     * due to mismatch.
     */
    @Override
    public void doBootstrap(TransportClient client, Channel channel) {
        SparkSaslClient saslClient = new SparkSaslClient(appId, secretKeyHolder, conf.saslEncryption());
        try {
            byte[] payload = saslClient.firstToken();

            while (!saslClient.isComplete()) {
                SaslMessage msg = new SaslMessage(appId, payload);
                ByteBuf buf = Unpooled.buffer(msg.encodedLength() + (int) msg.body().size());
                msg.encode(buf);
                buf.writeBytes(msg.body().nioByteBuffer());

                ByteBuffer response = client.sendRpcSync(buf.nioBuffer(), conf.authRTTimeoutMs());
                payload = saslClient.response(JavaUtils.bufferToArray(response));
            }

            client.setClientId(appId);

            if (conf.saslEncryption()) {
                if (!SparkSaslServer.QOP_AUTH_CONF.equals(saslClient.getNegotiatedProperty(Sasl.QOP))) {
                    throw new RuntimeException(
                            new SaslException("Encryption requests by negotiated non-encrypted connection."));
                }

                SaslEncryption.addToChannel(channel, saslClient, conf.maxSaslEncryptedBlockSize());
                saslClient = null;
                logger.debug("Channel {} configured for encryption.", client);
            }
        } catch (IOException ioe) {
            throw new RuntimeException(ioe);
        } finally {
            if (saslClient != null) {
                try {
                    // Once authentication is complete, the server will trust all remaining communication.
                    saslClient.dispose();
                } catch (RuntimeException e) {
                    logger.error("Error while disposing SASL client", e);
                }
            }
        }
    }

}