/*
* Copyright 2002-2013 the original author or authors.
*
* Licensed 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.springframework.security.config.annotation.web.builders;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;
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.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.security.web.FilterChainProxy;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.util.UrlUtils;
/**
* Spring Security debugging filter.
* <p>
* Logs information (such as session creation) to help the user understand how requests are being handled
* by Spring Security and provide them with other relevant information (such as when sessions are being created).
*
*
* @author Luke Taylor
* @author Rob Winch
* @since 3.1
*/
class DebugFilter implements Filter {
private static final String ALREADY_FILTERED_ATTR_NAME = DebugFilter.class.getName().concat(".FILTERED");
private final FilterChainProxy fcp;
private final Logger logger = new Logger();
public DebugFilter(FilterChainProxy fcp) {
this.fcp = fcp;
}
public final void doFilter(ServletRequest srvltRequest, ServletResponse srvltResponse, FilterChain filterChain)
throws ServletException, IOException {
if (!(srvltRequest instanceof HttpServletRequest) || !(srvltResponse instanceof HttpServletResponse)) {
throw new ServletException("DebugFilter just supports HTTP requests");
}
HttpServletRequest request = (HttpServletRequest) srvltRequest;
HttpServletResponse response = (HttpServletResponse) srvltResponse;
List<Filter> filters = getFilters(request);
logger.log("Request received for '" + UrlUtils.buildRequestUrl(request) + "':\n\n" +
request + "\n\n" +
"servletPath:" + request.getServletPath() + "\n" +
"pathInfo:" + request.getPathInfo() + "\n\n" +
formatFilters(filters));
if (request.getAttribute(ALREADY_FILTERED_ATTR_NAME) == null) {
invokeWithWrappedRequest(request, response, filterChain);
} else {
fcp.doFilter(request, response, filterChain);
}
}
private void invokeWithWrappedRequest(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain) throws IOException, ServletException {
request.setAttribute(ALREADY_FILTERED_ATTR_NAME, Boolean.TRUE);
request = new DebugRequestWrapper(request);
try {
fcp.doFilter(request, response, filterChain);
}
finally {
request.removeAttribute(ALREADY_FILTERED_ATTR_NAME);
}
}
String formatFilters(List<Filter> filters) {
StringBuilder sb = new StringBuilder();
sb.append("Security filter chain: ");
if (filters == null) {
sb.append("no match");
} else if (filters.isEmpty()) {
sb.append("[] empty (bypassed by security='none') ");
} else {
sb.append("[\n");
for (Filter f : filters) {
sb.append(" ").append(f.getClass().getSimpleName()).append("\n");
}
sb.append("]");
}
return sb.toString();
}
private List<Filter> getFilters(HttpServletRequest request) {
for (SecurityFilterChain chain : fcp.getFilterChains()) {
if (chain.matches(request)) {
return chain.getFilters();
}
}
return null;
}
public void init(FilterConfig filterConfig) throws ServletException {
}
public void destroy() {
}
}
class DebugRequestWrapper extends HttpServletRequestWrapper {
private static final Logger logger = new Logger();
public DebugRequestWrapper(HttpServletRequest request) {
super(request);
}
@Override
public HttpSession getSession() {
boolean sessionExists = super.getSession(false) != null;
HttpSession session = super.getSession();
if (!sessionExists) {
logger.log("New HTTP session created: " + session.getId(), true);
}
return session;
}
@Override
public HttpSession getSession(boolean create) {
if (!create) {
return super.getSession(create);
}
return getSession();
}
}
/**
* Controls output for the Spring Security debug feature.
*
* @author Luke Taylor
* @since 3.1
*/
final class Logger {
final static Log logger = LogFactory.getLog("Spring Security Debugger");
void log(String message) {
log(message, false);
}
void log(String message, boolean dumpStack) {
StringBuilder output = new StringBuilder(256);
output.append("\n\n************************************************************\n\n");
output.append(message).append("\n");
if (dumpStack) {
StringWriter os = new StringWriter();
new Exception().printStackTrace(new PrintWriter(os));
StringBuffer buffer = os.getBuffer();
// Remove the exception in case it scares people.
int start = buffer.indexOf("java.lang.Exception");
buffer.replace(start, start + 19, "");
output.append("\nCall stack: \n").append(os.toString());
}
output.append("\n\n************************************************************\n\n");
logger.info(output.toString());
}
}