/**
* 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.hadoop.gateway.hadoopauth.filter;
import java.io.IOException;
import java.security.AccessController;
import java.security.Principal;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.security.auth.Subject;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.gateway.security.PrimaryPrincipal;
import org.apache.hadoop.gateway.i18n.messages.MessagesFactory;
import org.apache.hadoop.gateway.hadoopauth.HadoopAuthMessages;
public class HadoopAuthPostFilter implements Filter {
private static HadoopAuthMessages log = MessagesFactory.get( HadoopAuthMessages.class );
@Override
public void init( FilterConfig filterConfig ) throws ServletException {
}
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest)request;
String principal = httpRequest.getRemoteUser();
if (principal != null) {
Subject subject = new Subject();
subject.getPrincipals().add(new PrimaryPrincipal(principal));
log.hadoopAuthAssertedPrincipal(principal);
doAs(httpRequest, response, chain, subject);
}
else {
((HttpServletResponse)response).sendError(HttpServletResponse.SC_FORBIDDEN, "User not authenticated");
}
}
private void doAs(final ServletRequest request, final ServletResponse response, final FilterChain chain, Subject subject)
throws IOException, ServletException {
try {
Subject.doAs(
subject,
new PrivilegedExceptionAction<Object>() {
public Object run() throws Exception {
chain.doFilter(request, response);
return null;
}
}
);
}
catch (PrivilegedActionException e) {
Throwable t = e.getCause();
if (t instanceof IOException) {
throw (IOException) t;
}
else if (t instanceof ServletException) {
throw (ServletException) t;
}
else {
throw new ServletException(t);
}
}
}
}