防止XSS 攻击集成springboot（详细）

XSS 防攻击

近期在看一个项目，发现XSS防攻击 ，然后就了解了一下与大家分享！！
度娘解释：
XSS是一种经常出现在web应用中的计算机安全漏洞，它允许恶意web用户将代码植入到提供给其它用户使用的页面中。比如这些代码包括HTML代码和客户端脚本。攻击者利用XSS漏洞旁路掉访问控制——例如同源策略(same origin policy)。这种类型的漏洞由于被骇客用来编写危害性更大的网络钓鱼(Phishing)攻击而变得广为人知。对于跨站脚本攻击，骇客界共识是：跨站脚本攻击是新型的“缓冲区溢出攻击“，而JavaScript是新型的“ShellCode”。

解决办法

利用过滤器对访问链接做处理，已达到防止XSS脚本攻击的目的。

实现方案

1.配置相关数据

在配置文件中配置

# 防止XSS攻击
xss: 
  # 过滤开关
  enabled: true
  # 排除链接（多个用逗号分隔）
  excludes: /system/notice/*
  # 匹配链接
  urlPatterns: /system/*,/monitor/*,/tool/*

2.编写Filter配置类

import java.util.Map;
import javax.servlet.DispatcherType;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.google.common.collect.Maps;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.xss.XssFilter;

/**
 * Filter配置
 *
 * @author xxx
 */
@Configuration
public class FilterConfig
{
    @Value("${xss.enabled}")
    private String enabled;

    @Value("${xss.excludes}")
    private String excludes;

    @Value("${xss.urlPatterns}")
    private String urlPatterns;

    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Bean
    public FilterRegistrationBean xssFilterRegistration()
    {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        //
        registration.setDispatcherTypes(DispatcherType.REQUEST);
        //过滤器类（继承Filter）
        registration.setFilter(new XssFilter());
        //
        registration.addUrlPatterns(StringUtils.split(urlPatterns, ","));
        //
        registration.setName("xssFilter");
        //
        registration.setOrder(Integer.MAX_VALUE);
        Map initParameters = Maps.newHashMap();
        initParameters.put("excludes", excludes);
        initParameters.put("enabled", enabled);
        //Filter 初始化参数
        registration.setInitParameters(initParameters);
        return registration;
    }
}

3.编写配置业务代码

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
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 javax.servlet.http.HttpServletResponse;
import com.ruoyi.common.utils.StringUtils;

/**
 * 防止XSS攻击的过滤器
 * 
 * @author xxx
 */
public class XssFilter implements Filter
{
    /**
     * 排除链接
     */
    public List excludes = new ArrayList<>();

    /**
     * xss过滤开关
     */
    public boolean enabled = false;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException
    {
        String tempExcludes = filterConfig.getInitParameter("excludes");
        String tempEnabled = filterConfig.getInitParameter("enabled");
        if (StringUtils.isNotEmpty(tempExcludes))
        {
            String[] url = tempExcludes.split(",");
            for (int i = 0; url != null && i < url.length; i++)
            {
                excludes.add(url[i]);
            }
        }
        if (StringUtils.isNotEmpty(tempEnabled))
        {
            enabled = Boolean.valueOf(tempEnabled);
        }
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException
    {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse resp = (HttpServletResponse) response;
        if (handleExcludeURL(req, resp))
        {
            chain.doFilter(request, response);
            return;
        }
        XssHttpServletRequestWrapper xssRequest = new XssHttpServletRequestWrapper((HttpServletRequest) request);
        chain.doFilter(xssRequest, response);
    }

    private boolean handleExcludeURL(HttpServletRequest request, HttpServletResponse response)
    {
        if (!enabled)
        {
            return true;
        }
        if (excludes == null || excludes.isEmpty())
        {
            return false;
        }
        String url = request.getServletPath();
        for (String pattern : excludes)
        {
            Pattern p = Pattern.compile("^" + pattern);
            Matcher m = p.matcher(url);
            if (m.find())
            {
                return true;
            }
        }
        return false;
    }

    @Override
    public void destroy()
    {

    }
}

上面的代码应该很好理解，就不说明了，接下来我们看 XssHttpServletRequestWrapper类中的代码

3.XssHttpServletRequestWrapper 类

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.jsoup.Jsoup;
import org.jsoup.safety.Whitelist;

/**
 * XSS过滤处理
 * 
 * @author xxx
 */
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper
{
    /**
     * @param request
     */
    public XssHttpServletRequestWrapper(HttpServletRequest request)
    {
        super(request);
    }

    @Override
    public String[] getParameterValues(String name)
    {
        String[] values = super.getParameterValues(name);
        if (values != null)
        {
            int length = values.length;
            String[] escapseValues = new String[length];
            for (int i = 0; i < length; i++)
            {
                // 防xss攻击和过滤前后空格
                escapseValues[i] = Jsoup.clean(values[i], Whitelist.relaxed()).trim();
            }
            return escapseValues;
        }
        return super.getParameterValues(name);
    }
}

到此就完成了！！