org.apache.drill.exec.rpc.AbstractServerConnection.java Source code

Introduction

Here is the source code for org.apache.drill.exec.rpc.AbstractServerConnection.java

Source

/*
 * 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.drill.exec.rpc;

import io.netty.channel.socket.SocketChannel;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.hadoop.security.HadoopKerberosName;
import org.apache.hadoop.security.UserGroupInformation;
import org.slf4j.Logger;

import javax.security.auth.login.LoginException;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import java.io.IOException;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

public abstract class AbstractServerConnection<S extends ServerConnection<S>> extends AbstractRemoteConnection
        implements ServerConnection<S> {

    private final ConnectionConfig config;

    private RequestHandler<S> currentHandler;
    private SaslServer saslServer;

    public AbstractServerConnection(SocketChannel channel, String name, ConnectionConfig config,
            RequestHandler<S> handler) {
        super(channel, name);
        this.config = config;
        this.currentHandler = handler;
    }

    public AbstractServerConnection(SocketChannel channel, ConnectionConfig config, RequestHandler<S> handler) {
        this(channel, config.getName(), config, handler);
    }

    @Override
    public BufferAllocator getAllocator() {
        return config.getAllocator();
    }

    protected abstract Logger getLogger();

    @Override
    public void initSaslServer(String mechanismName) throws SaslException {
        checkState(saslServer == null);
        try {
            this.saslServer = config.getAuthProvider().getAuthenticatorFactory(mechanismName)
                    .createSaslServer(UserGroupInformation.getLoginUser(), null
            /** properties; default QOP is auth */
            );
        } catch (final IOException e) {
            getLogger().debug("Login failed.", e);
            final Throwable cause = e.getCause();
            if (cause instanceof LoginException) {
                throw new SaslException("Failed to login.", cause);
            }
            throw new SaslException("Unexpected failure trying to login.", cause);
        }
        if (saslServer == null) {
            throw new SaslException("Server could not initiate authentication. Insufficient parameters?");
        }
    }

    @Override
    public SaslServer getSaslServer() {
        checkState(saslServer != null);
        return saslServer;
    }

    @Override
    public void finalizeSaslSession() throws IOException {
        final String authorizationID = getSaslServer().getAuthorizationID();
        final String remoteShortName = new HadoopKerberosName(authorizationID).getShortName();
        final String localShortName = UserGroupInformation.getLoginUser().getShortUserName();
        if (!localShortName.equals(remoteShortName)) {
            throw new SaslException(String.format(
                    "'primary' part of remote drillbit's service principal "
                            + "does not match with this drillbit's. Expected: '%s' Actual: '%s'",
                    localShortName, remoteShortName));
        }
        getLogger().debug("Authenticated connection for {}", authorizationID);
    }

    @Override
    public RequestHandler<S> getCurrentHandler() {
        return currentHandler;
    }

    @Override
    public void changeHandlerTo(final RequestHandler<S> handler) {
        checkNotNull(handler);
        this.currentHandler = handler;
    }

    @Override
    public void close() {
        try {
            if (saslServer != null) {
                saslServer.dispose();
                saslServer = null;
            }
        } catch (final SaslException e) {
            getLogger().warn("Unclean disposal.", e);
        }
        super.close();
    }
}