001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with this
004 * work for additional information regarding copyright ownership. The ASF
005 * licenses this file to you under the Apache License, Version 2.0 (the
006 * "License"); you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 * 
009 * http://www.apache.org/licenses/LICENSE-2.0
010 * 
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
013 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
014 * License for the specific language governing permissions and limitations under
015 * the License.
016 */
017package org.apache.hadoop.hdfs.server.datanode;
018
019import java.io.IOException;
020import java.net.InetSocketAddress;
021import java.net.ServerSocket;
022import java.nio.channels.ServerSocketChannel;
023import java.security.GeneralSecurityException;
024
025import org.apache.commons.daemon.Daemon;
026import org.apache.commons.daemon.DaemonContext;
027import org.apache.hadoop.conf.Configuration;
028
029import org.apache.hadoop.hdfs.DFSConfigKeys;
030import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
031import org.apache.hadoop.http.HttpConfig;
032import org.apache.hadoop.http.HttpServer;
033import org.apache.hadoop.security.UserGroupInformation;
034import org.apache.hadoop.security.ssl.SSLFactory;
035import org.mortbay.jetty.Connector;
036import org.mortbay.jetty.nio.SelectChannelConnector;
037import org.mortbay.jetty.security.SslSocketConnector;
038
039import javax.net.ssl.SSLServerSocketFactory;
040
041import com.google.common.annotations.VisibleForTesting;
042
043/**
044 * Utility class to start a datanode in a secure cluster, first obtaining 
045 * privileged resources before main startup and handing them to the datanode.
046 */
047public class SecureDataNodeStarter implements Daemon {
048  /**
049   * Stash necessary resources needed for datanode operation in a secure env.
050   */
051  public static class SecureResources {
052    private final ServerSocket streamingSocket;
053    private final Connector listener;
054    public SecureResources(ServerSocket streamingSocket,
055        Connector listener) {
056
057      this.streamingSocket = streamingSocket;
058      this.listener = listener;
059    }
060
061    public ServerSocket getStreamingSocket() { return streamingSocket; }
062
063    public Connector getListener() { return listener; }
064  }
065  
066  private String [] args;
067  private SecureResources resources;
068  private SSLFactory sslFactory;
069
070  @Override
071  public void init(DaemonContext context) throws Exception {
072    System.err.println("Initializing secure datanode resources");
073    Configuration conf = new Configuration();
074    
075    // Stash command-line arguments for regular datanode
076    args = context.getArguments();
077    
078    sslFactory = new SSLFactory(SSLFactory.Mode.SERVER, conf);
079    resources = getSecureResources(sslFactory, conf);
080  }
081
082  @Override
083  public void start() throws Exception {
084    System.err.println("Starting regular datanode initialization");
085    DataNode.secureMain(args, resources);
086  }
087  
088  @Override public void destroy() {
089    sslFactory.destroy();
090  }
091
092  @Override public void stop() throws Exception { /* Nothing to do */ }
093
094  @VisibleForTesting
095  public static SecureResources getSecureResources(final SSLFactory sslFactory,
096                                  Configuration conf) throws Exception {
097    // Obtain secure port for data streaming to datanode
098    InetSocketAddress streamingAddr  = DataNode.getStreamingAddr(conf);
099    int socketWriteTimeout = conf.getInt(DFSConfigKeys.DFS_DATANODE_SOCKET_WRITE_TIMEOUT_KEY,
100        HdfsServerConstants.WRITE_TIMEOUT);
101    
102    ServerSocket ss = (socketWriteTimeout > 0) ? 
103        ServerSocketChannel.open().socket() : new ServerSocket();
104    ss.bind(streamingAddr, 0);
105    
106    // Check that we got the port we need
107    if (ss.getLocalPort() != streamingAddr.getPort()) {
108      throw new RuntimeException("Unable to bind on specified streaming port in secure " +
109          "context. Needed " + streamingAddr.getPort() + ", got " + ss.getLocalPort());
110    }
111
112    // Obtain secure listener for web server
113    Connector listener;
114    if (HttpConfig.isSecure()) {
115      try {
116        sslFactory.init();
117      } catch (GeneralSecurityException ex) {
118        throw new IOException(ex);
119      }
120      SslSocketConnector sslListener = new SslSocketConnector() {
121        @Override
122        protected SSLServerSocketFactory createFactory() throws Exception {
123          return sslFactory.createSSLServerSocketFactory();
124        }
125      };
126      listener = sslListener;
127    } else {
128      listener = HttpServer.createDefaultChannelConnector();
129    }
130
131    InetSocketAddress infoSocAddr = DataNode.getInfoAddr(conf);
132    listener.setHost(infoSocAddr.getHostName());
133    listener.setPort(infoSocAddr.getPort());
134    // Open listener here in order to bind to port as root
135    listener.open();
136    if (listener.getPort() != infoSocAddr.getPort()) {
137      throw new RuntimeException("Unable to bind on specified info port in secure " +
138          "context. Needed " + streamingAddr.getPort() + ", got " + ss.getLocalPort());
139    }
140    System.err.println("Successfully obtained privileged resources (streaming port = "
141        + ss + " ) (http listener port = " + listener.getConnection() +")");
142    
143    if ((ss.getLocalPort() > 1023 || listener.getPort() > 1023) &&
144        UserGroupInformation.isSecurityEnabled()) {
145      throw new RuntimeException("Cannot start secure datanode with unprivileged ports");
146    }
147    System.err.println("Opened streaming server at " + streamingAddr);
148    System.err.println("Opened info server at " + infoSocAddr);
149    return new SecureResources(ss, listener);
150  }
151
152}