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 */
018package org.apache.hadoop.fs.http.server;
019
020import org.apache.hadoop.conf.Configuration;
021import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
022
023import javax.servlet.FilterConfig;
024import java.io.FileReader;
025import java.io.IOException;
026import java.io.Reader;
027import java.util.Map;
028import java.util.Properties;
029
030/**
031 * Subclass of hadoop-auth <code>AuthenticationFilter</code> that obtains its configuration
032 * from HttpFSServer's server configuration.
033 */
034public 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}