记一次JAVA WEB项目解决XSS攻击的办法(亲测有效)

• 什么是XSS攻击

　　　　简单来说,XSS 攻击是页面被注入了恶意的代码,度娘一大堆的东西,不想说

• 系统架构主要是SSM框架,服务层另外使用了DubboX.

　　　  为啥说这个,因为SpringMVC对于Xss攻击需要特殊处理

• 思路　　

　　　　其实XSS工具解决思路就是捕获客户端提交的参数进行捕获,然后对参数值进行过滤处理,去除那些非法的字符.

　　　　但是请求通常分为GET请求与POST请求,针对不同的请求,处理方式是不一样的

• 步骤:

　　　　1.针对GET与非文件格式上传的post请求.(form 表单提交的时候 没有这个参数enctype="multipart/form-data"),JSON请求等

1) web.xml配置过滤器

 <!-- xxs过滤 -->
 <filter>
     <filter-name>XssSqlFilter</filter-name>
     <filter-class>cn.ffcs.web.filter.XssFilter</filter-class>
 </filter>
 <filter-mapping>
     <filter-name>XssSqlFilter</filter-name>
     <url-pattern>/*</url-pattern>
     <dispatcher>REQUEST</dispatcher>
 </filter-mapping> 

2)过滤器实现 XssFilter.java,针对部分特殊请求,要求不走过滤的,可以在此过滤器中放行

 package cn.ffcs.web.filter;

 import java.io.IOException;

 import javax.servlet.FilterChain;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.web.filter.OncePerRequestFilter;

 public class XssFilter extends OncePerRequestFilter {
      private final Logger logger = LoggerFactory.getLogger(this.getClass());
      @Override
         protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
                 throws ServletException, IOException {
             try {
                 String uri = request.getRequestURI();
                 //特殊url不走过滤器
                 if (uri.contains("receipt") || uri.contains("mobile/buildingMgr")
                          || uri.contains("bestPay") || uri.contains("backNotify") || uri.contains("frontNotify")
                          || uri.contains("queryOrder") || uri.contains("refundNotify") || uri.contains("refund")
                          || uri.contains("reverse")) {
                     chain.doFilter(request, response);
                 } else {
                     XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request);
                     chain.doFilter(xssRequest, response);
                 }
             } catch (Exception e) {
                 logger.error("Xss过滤器，包装request对象失败");
                 chain.doFilter(request, response);
             }
         }
 }

3) XssHttpServletRequestWrapper

 package cn.ffcs.web.filter;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletRequestWrapper;

 public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {

     HttpServletRequest orgRequest = null;

     public XssHttpServletRequestWrapper(HttpServletRequest request) {
         super(request);
         orgRequest = request;
     }

     /**
      * 覆盖getParameter方法，将参数名和参数值都做xss过滤
      */
     @Override
     public String getParameter(String name) {
         String value = super.getParameter(xssEncode(name));
         if (value != null) {
             value = xssEncode(value);
         }
         return value;
     }
     /**
      * 覆盖getParameterValues方法，将参数名和参数值都做xss过滤
      */
     public String[] getParameterValues(String parameter) {
         String[] values = super.getParameterValues(parameter);
         if (values==null)  {
             return null;
         }
         int count = values.length;
         String[] encodedValues = new String[count];
         for (int i = 0; i < count; i++) {
             encodedValues[i] = xssEncode(values[i]);
         }
         return encodedValues;
     }

     /**
      * 获取request的属性时，做xss过滤
      */
      @Override
     public Object getAttribute(String name) {
         Object value = super.getAttribute(name);
         if (null != value && value instanceof String) {
             value = xssEncode((String) value);
         }
         return value;
     };

     /**
      * 覆盖getHeader方法，将参数名和参数值都做xss过滤。<br/>
      */
     @Override
     public String getHeader(String name) {
         String value = super.getHeader(xssEncode(name));
         if (value != null) {
             value = xssEncode(value);
         }
         return value;
     }

     /**
      * 将容易引起xss漏洞的半角字符直接替换成全角字符
      *
      * @param s
      * @return
      */
     private static String xssEncode(String s) {
         return XssEncode.xssEncode(s);
     }

     /**
      * 获取最原始的request
      *
      * @return
      */
     public HttpServletRequest getOrgRequest() {
         return orgRequest;
     }

     /**
      * 获取最原始的request的静态方法
      *
      * @return
      */
     public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
         if (req instanceof XssHttpServletRequestWrapper) {
             return ((XssHttpServletRequestWrapper) req).getOrgRequest();
         }

         return req;
     }

 }

4) 使用到的编码工具,过滤参数使用了xss-html-filter工具,具体可以自行替换

 package cn.ffcs.web.filter;

 import net.sf.xsshtmlfilter.HTMLFilter;

 public class XssEncode {
     public static String xssEncode(String s) {
         if (s == null || s.isEmpty()) {
             return s;
         }
         try {
             HTMLFilter htmlFilter = new HTMLFilter();
             String clean = htmlFilter.filter(s);
             return clean;
         } catch (NullPointerException e) {
             return s;
         } catch (Exception ex) {
             ex.printStackTrace();
         }

         return null;
     }
 }

5) pom.xml 配置引用的jar

 <dependency>
        <groupId>net.sf.xss-html-filter</groupId>
        <artifactId>xss-html-filter</artifactId>
        <version>1.5</version>
 </dependency>

　　　　2.针对enctype="multipart/form-data"格式的post提交

1) 更改springMVC默认Annotation适配器(org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter - ->    cn.ffcs.web.filter.XssAnnotationMethodHandlerAdapter),如果没有则添加

 <!-- annotation方法修饰器 -->
 <bean id="handlerAdapter" class="cn.ffcs.web.filter.XssAnnotationMethodHandlerAdapter">

 ....

 <bean>

2) 继承AnnotationMethodHandlerAdapter 并覆盖handle方法

 package cn.ffcs.web.filter;

 import java.util.Map;
 import java.util.Set;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 import net.sf.xsshtmlfilter.HTMLFilter;

 import org.apache.commons.lang.StringUtils;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter;
 @SuppressWarnings("deprecation")
 public class XssAnnotationMethodHandlerAdapter extends
         AnnotationMethodHandlerAdapter {

     @SuppressWarnings({ "rawtypes", "unchecked" })
     private void myXss(HttpServletRequest request){
         Map map = request.getParameterMap();
         Set<String> keySet = map.keySet();
         for(String key : keySet){
             String[] values = request.getParameterValues(key);
             if(values!=null&&values.length>0){
                 for(int i=0 ;i<values.length;i++){
                     if(!StringUtils.isBlank(values[i])){
                         values[i] = XssEncode.xssEncode(values[i]);
                     }
                 }
             }
         }
     }

     @Override
     public ModelAndView handle(HttpServletRequest request,
             HttpServletResponse response, Object handler) throws Exception {
         myXss(request);
         return super.handle(request, response, handler);
     }
 }

tip: 网上另外有说用反射实现带@Controller的控制器,感觉思路可以,但是没有成功.