/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. 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. For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.roller.weblogger.ui.core.filters;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.roller.weblogger.WebloggerException;
import org.apache.roller.weblogger.business.UserManager;
import org.apache.roller.weblogger.business.WebloggerFactory;
import org.apache.roller.weblogger.pojos.User;
import org.apache.roller.weblogger.ui.rendering.util.cache.SaltCache;
/**
* Filter checks all POST request for presence of valid salt value and rejects
* those without a salt value or with a salt value not generated by this Roller
* instance.
*/
public class ValidateSaltFilter implements Filter {
private static Log log = LogFactory.getLog(ValidateSaltFilter.class);
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
try {
HttpServletRequest httpReq = (HttpServletRequest) request;
final User authenticUser;
UserManager umgr = WebloggerFactory.getWeblogger().getUserManager();
if (httpReq.getUserPrincipal() != null) {
try {
authenticUser = umgr.getUserByUserName(httpReq.getUserPrincipal().getName(), Boolean.TRUE);
} catch (WebloggerException ex) {
log.error("ERROR checking user rile", ex);
throw new ServletException("Security Violation");
}
} else {
authenticUser = null;
}
if (httpReq.getMethod().equals("POST") && authenticUser != null) {
String salt = (String) httpReq.getParameter("salt");
SaltCache saltCache = SaltCache.getInstance();
if (salt == null || saltCache.get(salt) == null || !saltCache.get(salt).equals(authenticUser.getId())) {
throw new ServletException("Security Violation");
}
}
} catch (Exception e) {
log.error("Error validating salt", e);
}
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void destroy() {
}
}