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/*
*
* 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.qpid.server.management.plugin.servlet.rest;
import org.apache.commons.codec.binary.Base64;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.apache.log4j.Logger;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.registry.ApplicationRegistry;
import org.apache.qpid.server.security.auth.manager.AuthenticationManager;
import org.apache.qpid.server.security.auth.sasl.UsernamePrincipal;
import javax.security.auth.Subject;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.Principal;
import java.security.SecureRandom;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Random;
public class SaslServlet extends AbstractServlet
{
private static final Logger LOGGER = Logger.getLogger(SaslServlet.class);
private static final SecureRandom SECURE_RANDOM = new SecureRandom();
private static final String ATTR_RANDOM = "SaslServlet.Random";
private static final String ATTR_ID = "SaslServlet.ID";
private static final String ATTR_SASL_SERVER = "SaslServlet.SaslServer";
private static final String ATTR_EXPIRY = "SaslServlet.Expiry";
private static final long SASL_EXCHANGE_EXPIRY = 1000L;
public SaslServlet()
{
super();
}
public SaslServlet(Broker broker)
{
super(broker);
}
protected void onGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException,
IOException
{
response.setContentType("application/json");
response.setStatus(HttpServletResponse.SC_OK);
response.setHeader("Cache-Control","no-cache");
response.setHeader("Pragma","no-cache");
response.setDateHeader ("Expires", 0);
HttpSession session = request.getSession();
Random rand = getRandom(session);
AuthenticationManager authManager = ApplicationRegistry.getInstance().getAuthenticationManager(getSocketAddress(request));
String[] mechanisms = authManager.getMechanisms().split(" ");
Map<String, Object> outputObject = new LinkedHashMap<String, Object>();
final Subject subject = (Subject) session.getAttribute("subject");
if(subject != null)
{
final Principal principal = subject.getPrincipals().iterator().next();
outputObject.put("user", principal.getName());
}
else if (request.getRemoteUser() != null)
{
outputObject.put("user", request.getRemoteUser());
}
outputObject.put("mechanisms", (Object) mechanisms);
final PrintWriter writer = response.getWriter();
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationConfig.Feature.INDENT_OUTPUT, true);
mapper.writeValue(writer, outputObject);
}
private Random getRandom(final HttpSession session)
{
Random rand = (Random) session.getAttribute(ATTR_RANDOM);
if(rand == null)
{
synchronized (SECURE_RANDOM)
{
rand = new Random(SECURE_RANDOM.nextLong());
}
session.setAttribute(ATTR_RANDOM, rand);
}
return rand;
}
@Override
protected void onPost(final HttpServletRequest request, final HttpServletResponse response)
throws ServletException, IOException
{
try
{
response.setContentType("application/json");
response.setHeader("Cache-Control","no-cache");
response.setHeader("Pragma","no-cache");
response.setDateHeader("Expires", 0);
HttpSession session = request.getSession();
String mechanism = request.getParameter("mechanism");
String id = request.getParameter("id");
String saslResponse = request.getParameter("response");
AuthenticationManager authManager = ApplicationRegistry.getInstance().getAuthenticationManager(getSocketAddress(request));
if(mechanism != null)
{
if(id == null)
{
SaslServer saslServer = authManager.createSaslServer(mechanism, request.getServerName(), null/*TODO*/);
evaluateSaslResponse(response, session, saslResponse, saslServer);
}
else
{
response.setStatus(HttpServletResponse.SC_EXPECTATION_FAILED);
session.removeAttribute(ATTR_ID);
session.removeAttribute(ATTR_SASL_SERVER);
session.removeAttribute(ATTR_EXPIRY);
}
}
else
{
if(id != null)
{
if(id.equals(session.getAttribute(ATTR_ID)) && System.currentTimeMillis() < (Long) session.getAttribute(ATTR_EXPIRY))
{
SaslServer saslServer = (SaslServer) session.getAttribute(ATTR_SASL_SERVER);
evaluateSaslResponse(response, session, saslResponse, saslServer);
}
else
{
response.setStatus(HttpServletResponse.SC_EXPECTATION_FAILED);
session.removeAttribute(ATTR_ID);
session.removeAttribute(ATTR_SASL_SERVER);
session.removeAttribute(ATTR_EXPIRY);
}
}
else
{
response.setStatus(HttpServletResponse.SC_EXPECTATION_FAILED);
session.removeAttribute(ATTR_ID);
session.removeAttribute(ATTR_SASL_SERVER);
session.removeAttribute(ATTR_EXPIRY);
}
}
}
catch(IOException e)
{
LOGGER.error("Error processing SASL request", e);
throw e;
}
catch(RuntimeException e)
{
LOGGER.error("Error processing SASL request", e);
throw e;
}
}
private void evaluateSaslResponse(final HttpServletResponse response,
final HttpSession session,
final String saslResponse, final SaslServer saslServer) throws IOException
{
final String id;
byte[] challenge;
try
{
challenge = saslServer.evaluateResponse(saslResponse == null ? new byte[0] : Base64.decodeBase64(saslResponse.getBytes()));
}
catch(SaslException e)
{
session.removeAttribute(ATTR_ID);
session.removeAttribute(ATTR_SASL_SERVER);
session.removeAttribute(ATTR_EXPIRY);
response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
return;
}
if(saslServer.isComplete())
{
final Subject subject = new Subject();
subject.getPrincipals().add(new UsernamePrincipal(saslServer.getAuthorizationID()));
session.setAttribute("subject", subject);
session.removeAttribute(ATTR_ID);
session.removeAttribute(ATTR_SASL_SERVER);
session.removeAttribute(ATTR_EXPIRY);
response.setStatus(HttpServletResponse.SC_OK);
}
else
{
Random rand = getRandom(session);
id = String.valueOf(rand.nextLong());
session.setAttribute(ATTR_ID, id);
session.setAttribute(ATTR_SASL_SERVER, saslServer);
session.setAttribute(ATTR_EXPIRY, System.currentTimeMillis() + SASL_EXCHANGE_EXPIRY);
response.setStatus(HttpServletResponse.SC_OK);
Map<String, Object> outputObject = new LinkedHashMap<String, Object>();
outputObject.put("id", id);
outputObject.put("challenge", new String(Base64.encodeBase64(challenge)));
final PrintWriter writer = response.getWriter();
ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationConfig.Feature.INDENT_OUTPUT, true);
mapper.writeValue(writer, outputObject);
}
}
}
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