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tomcat-memshell-scanner.jsp
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tomcat-memshell-scanner.jsp
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<%@ page import="java.net.URL" %>
<%@ page import="java.lang.reflect.Field" %>
<%@ page import="java.util.HashMap" %>
<%@ page import="com.sun.org.apache.bcel.internal.Repository" %>
<%@ page import="java.net.URLEncoder" %>
<%@ page import="java.util.Map" %>
<%@ page import="org.apache.catalina.core.StandardWrapper" %>
<%@ page import="java.lang.reflect.Method" %>
<%@ page import="org.apache.catalina.Container" %>
<%@ page import="org.apache.tomcat.websocket.server.WsServerContainer" %>
<%@ page import="javax.websocket.server.ServerContainer" %>
<%@ page import="javax.websocket.server.ServerEndpointConfig" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>tomcat-memshell-killer</title>
</head>
<body>
<center>
<div>
<%!
public Object getStandardContext(HttpServletRequest request) throws NoSuchFieldException, IllegalAccessException {
Object context = request.getSession().getServletContext();
Field _context = context.getClass().getDeclaredField("context");
_context.setAccessible(true);
Object appContext = _context.get(context);
Field __context = appContext.getClass().getDeclaredField("context");
__context.setAccessible(true);
Object standardContext = __context.get(appContext);
return standardContext;
}
public HashMap<String,Object> getFilterConfig(HttpServletRequest request) throws Exception{
Object standardContext = getStandardContext(request);
Field _filterConfigs = standardContext.getClass().getDeclaredField("filterConfigs");
_filterConfigs.setAccessible(true);
HashMap<String,Object> filterConfigs = (HashMap<String,Object>)_filterConfigs.get(standardContext);
return filterConfigs;
}
// FilterMap[]
public Object[] getFilterMaps(HttpServletRequest request) throws Exception{
Object standardContext = getStandardContext(request);
Field _filterMaps = standardContext.getClass().getDeclaredField("filterMaps");
_filterMaps.setAccessible(true);
Object filterMaps = _filterMaps.get(standardContext);
Object[] filterArray = null;
try { // tomcat 789
Field _array = filterMaps.getClass().getDeclaredField("array");
_array.setAccessible(true);
filterArray = (Object[]) _array.get(filterMaps);
}catch (Exception e){ // tomcat 6
filterArray = (Object[]) filterMaps;
}
return filterArray;
}
/**
* 遗留问题,getFilterConfig()依然存在2个
* @param request
* @param filterName
* @throws Exception
*/
public synchronized void deleteFilter(HttpServletRequest request,String filterName) throws Exception{
Object standardContext = getStandardContext(request);
// org.apache.catalina.core.StandardContext#removeFilterDef
HashMap<String,Object> filterConfig = getFilterConfig(request);
Object appFilterConfig = filterConfig.get(filterName);
Field _filterDef = appFilterConfig.getClass().getDeclaredField("filterDef");
_filterDef.setAccessible(true);
Object filterDef = _filterDef.get(appFilterConfig);
Class clsFilterDef = null;
try{
// Tomcat 8
clsFilterDef = Class.forName("org.apache.tomcat.util.descriptor.web.FilterDef");
}catch (Exception e){
// Tomcat 7
clsFilterDef = Class.forName("org.apache.catalina.deploy.FilterDef");
}
Method removeFilterDef = standardContext.getClass().getDeclaredMethod("removeFilterDef", new Class[]{clsFilterDef});
removeFilterDef.setAccessible(true);
removeFilterDef.invoke(standardContext,filterDef);
// org.apache.catalina.core.StandardContext#removeFilterMap
Class clsFilterMap = null;
try{
// Tomcat 8
clsFilterMap = Class.forName("org.apache.tomcat.util.descriptor.web.FilterMap");
}catch (Exception e){
// Tomcat 7
clsFilterMap = Class.forName("org.apache.catalina.deploy.FilterMap");
}
Object[] filterMaps = getFilterMaps(request);
for(Object filterMap:filterMaps){
Field _filterName = filterMap.getClass().getDeclaredField("filterName");
_filterName.setAccessible(true);
String filterName0 = (String)_filterName.get(filterMap);
if(filterName0.equals(filterName)){
Method removeFilterMap = standardContext.getClass().getDeclaredMethod("removeFilterMap", new Class[]{clsFilterMap});
removeFilterDef.setAccessible(true);
removeFilterMap.invoke(standardContext,filterMap);
}
}
}
public synchronized void deleteServlet(HttpServletRequest request,String servletName) throws Exception{
HashMap<String,Object> childs = getChildren(request);
Object objChild = childs.get(servletName);
String urlPattern = null;
HashMap<String,String> servletMaps = getServletMaps(request);
for(Map.Entry<String,String> servletMap:servletMaps.entrySet()){
if(servletMap.getValue().equals(servletName)){
urlPattern = servletMap.getKey();
break;
}
}
if(urlPattern != null) {
// 反射调用 org.apache.catalina.core.StandardContext#removeServletMapping
Object standardContext = getStandardContext(request);
Method removeServletMapping = standardContext.getClass().getDeclaredMethod("removeServletMapping", new Class[]{String.class});
removeServletMapping.setAccessible(true);
removeServletMapping.invoke(standardContext, urlPattern);
// Tomcat 6必须removeChild 789可以不用
// 反射调用 org.apache.catalina.core.StandardContext#removeChild
Method removeChild = standardContext.getClass().getDeclaredMethod("removeChild", new Class[]{org.apache.catalina.Container.class});
removeChild.setAccessible(true);
removeChild.invoke(standardContext, objChild);
}
}
public synchronized void deleteEndpint(HttpServletRequest request,String servletName) throws Exception{
Map<String,Object> ExactMatch = getExactMatch(request);
ExactMatch.remove(servletName);
}
public synchronized HashMap<String,Object> getChildren(HttpServletRequest request) throws Exception{
Object standardContext = getStandardContext(request);
Field _children = standardContext.getClass().getSuperclass().getDeclaredField("children");
_children.setAccessible(true);
HashMap<String,Object> children = (HashMap<String, Object>) _children.get(standardContext);
return children;
}
public synchronized Map<String,Object> getExactMatch(HttpServletRequest request) throws Exception{
WsServerContainer wsServerContainer = (WsServerContainer) request.getSession().getServletContext().getAttribute(ServerContainer.class.getName());
Class<?> obj = Class.forName("org.apache.tomcat.websocket.server.WsServerContainer");
Field field = obj.getDeclaredField("configExactMatchMap");
field.setAccessible(true);
Map<String, Object> configExactMatchMap = (Map<String, Object>) field.get(wsServerContainer);
return configExactMatchMap;
}
public synchronized HashMap<String,String> getServletMaps(HttpServletRequest request) throws Exception{
Object standardContext = getStandardContext(request);
Field _servletMappings = standardContext.getClass().getDeclaredField("servletMappings");
_servletMappings.setAccessible(true);
HashMap<String,String> servletMappings = (HashMap<String,String>)_servletMappings.get(standardContext);
return servletMappings;
}
public String getFilterName(Object filterMap) throws Exception{
Method getFilterName = filterMap.getClass().getDeclaredMethod("getFilterName");
getFilterName.setAccessible(true);
return (String)getFilterName.invoke(filterMap,null);
}
public String[] getURLPatterns(Object filterMap) throws Exception{
Method getFilterName = filterMap.getClass().getDeclaredMethod("getURLPatterns");
getFilterName.setAccessible(true);
return (String[])getFilterName.invoke(filterMap,null);
}
String classFileIsExists(Class clazz){
if(clazz == null){
return "class is null";
}
String className = clazz.getName();
String classNamePath = className.replace(".", "/") + ".class";
URL is = clazz.getClassLoader().getResource(classNamePath);
if(is == null){
return "在磁盘上没有对应class文件，可能是内存马";
}else{
return is.getPath();
}
}
String arrayToString(String[] str){
String res = "[";
for (String s:str){
res += String.format("%s,",s);
}
res = res.substring(0,res.length()-1);
res += "]";
return res;
}
%>
<%
out.write("<h2>Tomcat memshell scanner 0.1.0</h2>");
String action = request.getParameter("action");
String filterName = request.getParameter("filterName");
String servletName = request.getParameter("servletName");
String EndpointName1 = request.getParameter("EndpointName");
String className = request.getParameter("className");
if(action != null && action.equals("kill") && filterName != null) {
deleteFilter(request,filterName);
}else if(action != null && action.equals("kill") && servletName != null){
deleteServlet(request,servletName);
}else if(action != null && action.equals("kill") && EndpointName1 != null){
deleteEndpint(request,EndpointName1);
}else if(action != null && action.equals("dump") && className != null){
byte[] classBytes = Repository.lookupClass(Class.forName(className)).getBytes();
response.addHeader("content-Type", "application/octet-stream");
String filename = Class.forName(className).getSimpleName() + ".class";
String agent = request.getHeader("User-Agent");
if(agent.toLowerCase().indexOf("chrome") > 0) {
response.addHeader("content-Disposition", "attachment;filename="+new String(filename.getBytes("UTF-8"), "ISO8859-1"));
} else {
response.addHeader("content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
}
ServletOutputStream outDumper = response.getOutputStream();
outDumper.write(classBytes,0, classBytes.length);
outDumper.close();
}else{
// Scan filter
out.write("<h4>Filter scan result</h4>");
out.write("<table border=\"1\" cellspacing=\"0\" width=\"95%\" style=\"table-layout:fixed;word-break:break-all;background:#f2f2f2\">\n" +
" <thead>\n" +
" <th width=\"5%\">ID</th>\n" +
" <th width=\"10%\">Filter name</th>\n" +
" <th width=\"10%\">Patern</th>\n" +
" <th width=\"20%\">Filter class</th>\n" +
" <th width=\"20%\">Filter classLoader</th>\n" +
" <th width=\"25%\">Filter class file path</th>\n" +
" <th width=\"5%\">dump class</th>\n" +
" <th width=\"5%\">kill</th>\n" +
" </thead>\n" +
" <tbody>");
HashMap<String,Object> filterConfigs = getFilterConfig(request);
Object[] filterMaps1 = getFilterMaps(request);
for(int i=0;i< filterMaps1.length;i++){
out.write("<tr>");
Object fm = filterMaps1[i];
Object appFilterConfig = filterConfigs.get(getFilterName(fm));
if(appFilterConfig == null){
continue;
}
Field _filter = appFilterConfig.getClass().getDeclaredField("filter");
_filter.setAccessible(true);
Object filter = _filter.get(appFilterConfig);
String filterClassName = filter.getClass().getName();
String filterClassLoaderName = filter.getClass().getClassLoader().getClass().getName();
// ID Filtername 匹配路径 className classLoader 是否存在file dump kill
out.write(String.format("<td style=\"text-align:center\">%d</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td><td style=\"text-align:center\"><a href=\"?action=dump&className=%s\">dump</a></td><td style=\"text-align:center\"><a href=\"?action=kill&filterName=%s\">kill</a></td>"
,i+1
,getFilterName(fm)
,arrayToString(getURLPatterns(fm))
,filterClassName
,filterClassLoaderName
,classFileIsExists(filter.getClass())
,filterClassName
,getFilterName(fm)));
out.write("</tr>");
}
out.write("</tbody></table>");
// Scan servlet
out.write("<h4>Servlet scan result</h4>");
out.write("<table border=\"1\" cellspacing=\"0\" width=\"95%\" style=\"table-layout:fixed;word-break:break-all;background:#f2f2f2\">\n" +
" <thead>\n" +
" <th width=\"5%\">ID</th>\n" +
" <th width=\"10%\">Servlet name</th>\n" +
" <th width=\"10%\">Patern</th>\n" +
" <th width=\"20%\">Servlet class</th>\n" +
" <th width=\"20%\">Servlet classLoader</th>\n" +
" <th width=\"25%\">Servlet class file path</th>\n" +
" <th width=\"5%\">dump class</th>\n" +
" <th width=\"5%\">kill</th>\n" +
" </thead>\n" +
" <tbody>");
HashMap<String,Object> children = getChildren(request);
Map<String,String> servletMappings = getServletMaps(request);
int servletId = 0;
for(Map.Entry<String,String> map:servletMappings.entrySet()){
String servletMapPath = map.getKey();
String servletName1 = map.getValue();
StandardWrapper wrapper = (StandardWrapper)children.get(servletName1);
Class servletClass = null;
try {
servletClass = Class.forName(wrapper.getServletClass());
}catch (Exception e){
Object servlet = wrapper.getServlet();
if(servlet != null){
servletClass = servlet.getClass();
}
}
if(servletClass != null) {
out.write("<tr>");
String servletClassName = servletClass.getName();
String servletClassLoaderName = null;
try{
servletClassLoaderName = servletClass.getClassLoader().getClass().getName();
}catch (Exception e){}
out.write(String.format("<td style=\"text-align:center\">%d</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td><td style=\"text-align:center\"><a href=\"?action=dump&className=%s\">dump</a></td><td style=\"text-align:center\"><a href=\"?action=kill&servletName=%s\">kill</a></td>"
, servletId + 1
, servletName1
, servletMapPath
, servletClassName
, servletClassLoaderName
, classFileIsExists(servletClass)
, servletClassName
, servletName1));
out.write("</tr>");
}
servletId++;
}
out.write("</tbody></table>");
// Scan Endpoint
out.write("<h4>Endpoint scan result</h4>");
out.write("<table border=\"1\" cellspacing=\"0\" width=\"95%\" style=\"table-layout:fixed;word-break:break-all;background:#f2f2f2\">\n" +
" <thead>\n" +
" <th width=\"5%\">ID</th>\n" +
" <th width=\"10%\">Patern</th>\n" +
" <th width=\"20%\">Endpoint class</th>\n" +
" <th width=\"20%\">Endpoint classLoader</th>\n" +
" <th width=\"25%\">Endpoint class file path</th>\n" +
" <th width=\"5%\">dump class</th>\n" +
" <th width=\"5%\">kill</th>\n" +
" </thead>\n" +
" <tbody>");
Map<String,Object> ExactMatch = null;
ExactMatch = getExactMatch(request);
// Map<String,String> servletMappings = getServletMaps(request);
int Endpointid = 0;
for(Map.Entry<String,Object> map:ExactMatch.entrySet()){
String EndpointPath = map.getKey();
Class EndpointName = ((ServerEndpointConfig) map.getValue()).getEndpointClass();
ClassLoader EndpointClassLoaderName = ((ServerEndpointConfig) map.getValue()).getEndpointClass().getClassLoader();
out.write("<tr>");
out.write(String.format("<td style=\"text-align:center\">%d</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td><td style=\"text-align:center\"><a href=\"?action=dump&className=%s\">dump</a></td><td style=\"text-align:center\"><a href=\"?action=kill&EndpointName=%s\">kill</a></td>"
, Endpointid + 1
, EndpointPath
, EndpointName.getName()
, EndpointClassLoaderName
, classFileIsExists(EndpointName)
, EndpointName.getName()
, EndpointPath));
out.write("</tr>");
servletId++;
}
out.write("</tbody></table>");
}
%>
</div>
<br/>
code by c0ny1
</center>
</body>
</html>