org.apache.giraph.comm.netty.handler.AuthorizeServerHandler.java Source code

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Here is the source code for org.apache.giraph.comm.netty.handler.AuthorizeServerHandler.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.giraph.comm.netty.handler;

import org.apache.giraph.comm.netty.NettyServer;
import org.apache.giraph.comm.netty.SaslNettyServer;
import org.apache.log4j.Logger;

import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

/**
 * Authorize or deny client requests based on existence and completeness
 * of client's SASL authentication.
 */
public class AuthorizeServerHandler extends ChannelInboundHandlerAdapter {
    /** Class logger */
    private static final Logger LOG = Logger.getLogger(AuthorizeServerHandler.class);

    /**
     * Constructor.
     */
    public AuthorizeServerHandler() {
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (LOG.isDebugEnabled()) {
            LOG.debug("messageReceived: Got " + msg.getClass());
        }
        // Authorize: client is allowed to doRequest() if and only if the client
        // has successfully authenticated with this server.
        SaslNettyServer saslNettyServer = ctx.attr(NettyServer.CHANNEL_SASL_NETTY_SERVERS).get();
        if (saslNettyServer == null) {
            LOG.warn("messageReceived: This client is *NOT* authorized to perform "
                    + "this action since there's no saslNettyServer to " + "authenticate the client: "
                    + "refusing to perform requested action: " + msg);
            return;
        }

        if (!saslNettyServer.isComplete()) {
            LOG.warn("messageReceived: This client is *NOT* authorized to perform "
                    + "this action because SASL authentication did not complete: "
                    + "refusing to perform requested action: " + msg);
            // Return now *WITHOUT* sending upstream here, since client
            // not authorized.
            return;
        }
        if (LOG.isDebugEnabled()) {
            LOG.debug("messageReceived: authenticated client: " + saslNettyServer.getUserName()
                    + " is authorized to do request " + "on server.");
        }
        // We call fireChannelRead since the client is allowed to perform this
        // request. The client's request will now proceed to the next
        // pipeline component, namely, RequestServerHandler.
        ctx.fireChannelRead(msg);
    }
}