springboot解决XSS存储型漏洞

springboot解决XSS存储型漏洞

XSS攻击

XSS 攻击：跨站脚本攻击(Cross Site Scripting)，为不和 前端层叠样式表(Cascading Style Sheets)CSS 混淆，故将跨站脚本攻击缩写为 XSS。

XSS(跨站脚本攻击)：是指恶意攻击者往 Web 页面里插入恶意 Script 代码，当用户浏览该页时，嵌入其中 Web 里面的 Script 代码会被执行，从而达到恶意攻击用户的目的。类似于 sql 注入。是目前最普遍的 Web 应用安全漏洞，也是 Web 攻击中最常见的攻击方式之一。

XSS（ 跨站脚本攻击）攻击通常指的是通过利用网页开发时留下的漏洞，通过巧妙的方法注入恶意指令代码到网页，使用户加载并执行攻击者恶意制造的网页程序。这些恶意网页程序通常是 JavaScript，但实际上也可以包括 Java、 VBScript、ActiveX、 Flash 或者甚至是普通的 HTML。攻击成功后，攻击者可能得到包括但不限于更高的权限（如执行一些操作）、私密网页内容、会话和 cookie 等各种内容。

XSS攻击示例：

过滤请求非法内容XSS类：XssRequestWrappers

这个类用来过滤请求非法内容，详细代码如下：

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

/**
 * @ClassName XssRequestWrappers
 * @Description TODO
 * @Author tongxueqiyue
 * @Date 2023/12/18 10:43
 * @Version 1.0
 */
public class XssRequestWrappers extends HttpServletRequestWrapper {
    private CommonsMultipartResolver multiparResolver = new CommonsMultipartResolver();

    public XssRequestWrappers(HttpServletRequest request) {
        super(request);

        String type = request.getHeader("Content-Type");
        if (!StringUtils.isEmpty(type) && type.contains("multipart/form-data")) {
            MultipartHttpServletRequest multipartHttpServletRequest = multiparResolver.resolveMultipart(request);
            Map<String, String[]> stringMap = multipartHttpServletRequest.getParameterMap();
            if (!stringMap.isEmpty()) {
                for (String key : stringMap.keySet()) {
                    String value = multipartHttpServletRequest.getParameter(key);
                    striptXSS(key);
                    striptXSS(value);
                }
            }
            super.setRequest(multipartHttpServletRequest);
        }
    }

    @Override
    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] = striptXSS(values[i]);
        }
        return encodedValues;
    }

    @Override
    public String getParameter(String parameter) {
        String value = super.getParameter(parameter);
        return striptXSS(value);
    }

    @Override
    public String getHeader(String name) {
        String value = super.getHeader(name);
        return striptXSS(value);
    }

    @Override
    public Map<String, String[]> getParameterMap() {
        Map<String, String[]> map1 = super.getParameterMap();
        Map<String, String[]> escapseMap = new HashMap<String, String[]>();
        Set<String> keys = map1.keySet();
        for (String key : keys) {
            String[] valArr = map1.get(key);
            if (valArr != null && valArr.length > 0) {
                String[] escapseValArr = new String[valArr.length];
                for (int i = 0; i < valArr.length; i++) {
                    String escapseVal = striptXSS(valArr[i]);
                    escapseValArr[i] = escapseVal;
                }
                escapseMap.put(key, escapseValArr);
            }
        }

        return escapseMap;
    }

	//处理非法内容，如果有新的在此处增加即可
    public static String striptXSS(String value) {
        if (value != null) {
            // 替换空字符串，以便清除潜在的恶意脚本
            value = value.replaceAll("", "");

            // 移除", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除带有src属性的标签，支持单引号和双引号包围的属性值
            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除标签
            scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除以开头的标签
            scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除eval()函数调用
            scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除expression()函数调用
            scriptPattern = Pattern.compile("e­xpression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除以"javascript:"开头的字符串
            scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除以"vbscript:"开头的字符串
            scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除以"onload..."开头的字符串
            scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");

            // 移除包含任何<和>字符的字符串
            scriptPattern = Pattern.compile(".*<.*", Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
        }

        // 返回处理后的字符串
        return value;
    }
}

定义过滤器监听XSSFilter 重写Filter

在这个过滤器中监听XSSFilter，使用上面写的XssRequestWrappers来处理请求中的非法内容

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;

/**
 * @ClassName XSSFilter
 * @Description TODO
 * @Author tongxueqiyue
 * @Date 2023/12/18 10:45
 * @Version 1.0
 */
public class XSSFilter implements Filter {

    @Override
    public void init(FilterConfig arg0) throws ServletException {
    }

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        chain.doFilter(new XssRequestWrappers((HttpServletRequest) request), response);

    }
}

注册这个XSSFilter为Bean

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class WebConfig {

    @Bean
    public FilterRegistrationBean<XSSFilter> xssFilterRegistrationBean() {
        FilterRegistrationBean<XSSFilter> registrationBean = new FilterRegistrationBean<>();
        registrationBean.setFilter(new XSSFilter());
        registrationBean.addUrlPatterns("/*"); // 这里配置需要过滤的URL
        registrationBean.setName("xssFilter");
        registrationBean.setOrder(1); // 设置过滤器的执行顺序，数字越小越优先
        return registrationBean;
    }
}

执行这三步应该就可以了，不过启动可能会报错，如果报错添加以下依赖即可：

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.4</version>
</dependency>

到这里XSS存储型漏洞应该就能解决了

参考：
https://blog.csdn.net/qq_25580555/article/details/128237542
https://blog.csdn.net/qq_26244285/article/details/122586506