XSS漏洞解决方案之一：过滤器

最新推荐文章于 2025-06-26 13:32:14 发布

GavinYCF

最新推荐文章于 2025-06-26 13:32:14 发布

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分类专栏：漏洞修补

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本文介绍了一种通过在web应用中部署XSS过滤器来防御跨站脚本攻击的方法。通过在web.xml配置XSSFilter，并实现XssHttpServletRequestWrapper类来过滤用户输入，有效预防XSS攻击。

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XSS漏洞解决方案之一：过滤器

一：web.xml文件

<!-- 解决xss漏洞 -->  
  <filter>  
    <filter-name>xssFilter</filter-name>  
     <filter-class>com.baidu.rigel.sandbox.core.filter.XSSFilter</filter-class>  
  </filter>  
  
  <!-- 解决xss漏洞 -->  
  <filter-mapping>  
    <filter-name>xssFilter</filter-name>  
    <url-pattern>/*</url-pattern>  
  </filter-mapping>  

  <!-- 解决xss漏洞 -->
  <filter>
    <filter-name>xssFilter</filter-name>
     <filter-class>com.baidu.rigel.sandbox.core.filter.XSSFilter</filter-class>
  </filter>

  <!-- 解决xss漏洞 -->
  <filter-mapping>
    <filter-name>xssFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

二：过滤器:XSSFilter.java

package com.rigel.sandbox.core.filter;  
  
import java.io.IOException;  
  
import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
import javax.servlet.http.HttpServletRequest;  
  
import com.rigel.sandbox.core.util.XssHttpServletRequestWrapper;  
  
public class XSSFilter implements Filter {  
  
    @Override  
    public void init(FilterConfig filterConfig) throws ServletException {  
    }  
  
    @Override  
    public void doFilter(ServletRequest request, ServletResponse response,  
            FilterChain chain) throws IOException, ServletException {  
  
        XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper(  
                (HttpServletRequest) request);  
        chain.doFilter(xssRequest, response);  
    }  
  
    @Override  
    public void destroy() {  
    }  
  
}  

package com.rigel.sandbox.core.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.rigel.sandbox.core.util.XssHttpServletRequestWrapper;

public class XSSFilter implements Filter {

@Override
public void init(FilterConfig filterConfig) throws ServletException {
}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {

XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper(
(HttpServletRequest) request);
chain.doFilter(xssRequest, response);
}

@Override
public void destroy() {
}

}

三：包装器：XssHttpServletRequestWrapper.java

package com.rigel.sandbox.core.util;  
  
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。<br/> 
     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取<br/> 
     * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖 
     */  
    @Override  
    public String getParameter(String name) {  
        String value = super.getParameter(xssEncode(name));  
        if (value != null) {  
            value = xssEncode(value);  
        }  
        return value;  
    }  
  
    /** 
     * 覆盖getHeader方法，将参数名和参数值都做xss过滤。<br/> 
     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取<br/> 
     * getHeaderNames 也可能需要覆盖 
     */  
    @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) {  
        if (s == null || s.isEmpty()) {  
            return s;  
        }  
        StringBuilder sb = new StringBuilder(s.length() + 16);  
        for (int i = 0; i < s.length(); i++) {  
            char c = s.charAt(i);  
            switch (c) {  
            case '>':  
                sb.append(">");// 转义大于号   
                break;  
            case '<':  
                sb.append("<");// 转义小于号   
                break;  
            case '\'':  
                sb.append("'");// 转义单引号   
                break;  
            case '\"':  
                sb.append(""");// 转义双引号   
                break;  
            case '&':  
                sb.append("&");// 转义&   
                break;  
            default:  
                sb.append(c);  
                break;  
            }  
        }  
        return sb.toString();  
    }  
  
    /** 
     * 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;  
    }  
}