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 */
017 package org.apache.hadoop.hdfs.server.namenode;
018
019 import java.io.IOException;
020 import java.io.OutputStreamWriter;
021 import java.io.PrintWriter;
022 import java.security.PrivilegedExceptionAction;
023
024 import javax.servlet.ServletContext;
025 import javax.servlet.ServletException;
026 import javax.servlet.http.HttpServletRequest;
027 import javax.servlet.http.HttpServletResponse;
028
029 import org.apache.commons.logging.Log;
030 import org.apache.commons.logging.LogFactory;
031 import org.apache.hadoop.conf.Configuration;
032 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
033 import org.apache.hadoop.security.UserGroupInformation;
034 import org.apache.hadoop.security.token.Token;
035
036 import com.google.common.base.Charsets;
037
038 /**
039 * Renew delegation tokens over http for use in hftp.
040 */
041 @SuppressWarnings("serial")
042 public class RenewDelegationTokenServlet extends DfsServlet {
043 private static final Log LOG = LogFactory.getLog(RenewDelegationTokenServlet.class);
044 public static final String PATH_SPEC = "/renewDelegationToken";
045 public static final String TOKEN = "token";
046
047 @Override
048 protected void doGet(final HttpServletRequest req, final HttpServletResponse resp)
049 throws ServletException, IOException {
050 final UserGroupInformation ugi;
051 final ServletContext context = getServletContext();
052 final Configuration conf = NameNodeHttpServer.getConfFromContext(context);
053 try {
054 ugi = getUGI(req, conf);
055 } catch(IOException ioe) {
056 LOG.info("Request for token received with no authentication from "
057 + req.getRemoteAddr(), ioe);
058 resp.sendError(HttpServletResponse.SC_FORBIDDEN,
059 "Unable to identify or authenticate user");
060 return;
061 }
062 final NameNode nn = NameNodeHttpServer.getNameNodeFromContext(context);
063 String tokenString = req.getParameter(TOKEN);
064 if (tokenString == null) {
065 resp.sendError(HttpServletResponse.SC_MULTIPLE_CHOICES,
066 "Token to renew not specified");
067 }
068 final Token<DelegationTokenIdentifier> token =
069 new Token<DelegationTokenIdentifier>();
070 token.decodeFromUrlString(tokenString);
071
072 try {
073 long result = ugi.doAs(new PrivilegedExceptionAction<Long>() {
074 @Override
075 public Long run() throws Exception {
076 return nn.getRpcServer().renewDelegationToken(token);
077 }
078 });
079 final PrintWriter os = new PrintWriter(new OutputStreamWriter(
080 resp.getOutputStream(), Charsets.UTF_8));
081 os.println(result);
082 os.close();
083 } catch(Exception e) {
084 // transfer exception over the http
085 String exceptionClass = e.getClass().getName();
086 String exceptionMsg = e.getLocalizedMessage();
087 String strException = exceptionClass + ";" + exceptionMsg;
088 LOG.info("Exception while renewing token. Re-throwing. s=" + strException, e);
089 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, strException);
090 }
091 }
092 }