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.