/*
* 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 org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
/**
* Authorize or deny client requests based on existence and completeness
* of client's SASL authentication.
*/
public class AuthorizeServerHandler extends
SimpleChannelUpstreamHandler {
/** Class logger */
private static final Logger LOG =
Logger.getLogger(AuthorizeServerHandler.class);
/**
* Constructor.
*/
public AuthorizeServerHandler() {
}
@Override
public void messageReceived(
ChannelHandlerContext ctx, MessageEvent e) {
if (LOG.isDebugEnabled()) {
LOG.debug("messageReceived: Got " + e.getMessage().getClass());
}
// Authorize: client is allowed to doRequest() if and only if the client
// has successfully authenticated with this server.
SaslNettyServer saslNettyServer =
NettyServer.CHANNEL_SASL_NETTY_SERVERS.get(ctx.getChannel());
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: " + e.getMessage());
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: " + e.getMessage());
// 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 sendUpstream() since the client is allowed to perform this
// request. The client's request will now proceed to the next
// pipeline component, namely, RequestServerHandler.
ctx.sendUpstream(e);
}
}