001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.fs.http.server;
019    
020    import org.apache.hadoop.conf.Configuration;
021    import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
022    
023    import javax.servlet.FilterConfig;
024    import java.io.FileReader;
025    import java.io.IOException;
026    import java.io.Reader;
027    import java.util.Map;
028    import java.util.Properties;
029    
030    /**
031     * Subclass of hadoop-auth <code>AuthenticationFilter</code> that obtains its configuration
032     * from HttpFSServer's server configuration.
033     */
034    public class AuthFilter extends AuthenticationFilter {
035      private static final String CONF_PREFIX = "httpfs.authentication.";
036    
037      private static final String SIGNATURE_SECRET_FILE = SIGNATURE_SECRET + ".file";
038    
039      /**
040       * Returns the hadoop-auth configuration from HttpFSServer's configuration.
041       * <p/>
042       * It returns all HttpFSServer's configuration properties prefixed with
043       * <code>httpfs.authentication</code>. The <code>httpfs.authentication</code>
044       * prefix is removed from the returned property names.
045       *
046       * @param configPrefix parameter not used.
047       * @param filterConfig parameter not used.
048       *
049       * @return hadoop-auth configuration read from HttpFSServer's configuration.
050       */
051      @Override
052      protected Properties getConfiguration(String configPrefix, FilterConfig filterConfig) {
053        Properties props = new Properties();
054        Configuration conf = HttpFSServerWebApp.get().getConfig();
055    
056        props.setProperty(AuthenticationFilter.COOKIE_PATH, "/");
057        for (Map.Entry<String, String> entry : conf) {
058          String name = entry.getKey();
059          if (name.startsWith(CONF_PREFIX)) {
060            String value = conf.get(name);
061            name = name.substring(CONF_PREFIX.length());
062            props.setProperty(name, value);
063          }
064        }
065    
066        String signatureSecretFile = props.getProperty(SIGNATURE_SECRET_FILE, null);
067        if (signatureSecretFile == null) {
068          throw new RuntimeException("Undefined property: " + SIGNATURE_SECRET_FILE);
069        }
070    
071        try {
072          StringBuilder secret = new StringBuilder();
073          Reader reader = new FileReader(signatureSecretFile);
074          int c = reader.read();
075          while (c > -1) {
076            secret.append((char)c);
077            c = reader.read();
078          }
079          reader.close();
080          props.setProperty(AuthenticationFilter.SIGNATURE_SECRET, secret.toString());
081        } catch (IOException ex) {
082          throw new RuntimeException("Could not read HttpFS signature secret file: " + signatureSecretFile);
083        }
084        return props;
085      }
086    
087    
088    }