如何在Spring RESTful中创建过滤器来防止XSS？

问题描述 投票：0回答：2

我从 Spring 4.2.6.RELEASE 开始使用，后端是休息服务。 现在我无法过滤 Prevent XSS

我的过滤器是：

@Component
@Order(1)
public class XSSFilter implements Filter {

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

  @Override
  public void destroy() {
  }

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

      chain.doFilter(new XSSRequestWrapper((HttpServletRequest) request), response);
   }

}

XSSRequestWrapper 是：

public class XSSRequestWrapper extends HttpServletRequestWrapper {

  public XSSRequestWrapper(HttpServletRequest servletRequest) {
    super(servletRequest);
  }

  @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] = stripXSS(values[i]);
    }

    return encodedValues;
  }

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

    return stripXSS(value);
  }

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

  private String stripXSS(String value) {

    return StringEscapeUtils.escapeHtml(value);
  }
}

并且在 WebConfig 扩展了 WebMvcConfigurerAdapter 类：

// -----------------------------------------------------
// Prevent XSS
// -----------------------------------------------------

@Bean
public FilterRegistrationBean xssPreventFilter() {
    FilterRegistrationBean registrationBean = new FilterRegistrationBean();

    registrationBean.setFilter(new XSSFilter());
    registrationBean.addUrlPatterns("/*");

    return registrationBean;
}

我的休息课是：

@RestController
@RequestMapping("/personService")
public class PersonController extends BaseController<PersonDto, PersonCriteria> {

  @RequestMapping( value= "/test" )
  private void getTest2(@RequestParam String name) {

      System.out.println(name);

      System.out.println( StringEscapeUtils.escapeHtml(name) );

  }

}

但是它不起作用，没有任何错误或异常。 我怎样才能做到这一点并创建我自己的过滤器？我只使用 Java Config，不使用 XML。 在我的控制器中，我被迫再次使用 StringEscapeUtils.escapeHtml(name) ，这很糟糕。

spring rest xss spring-java-config
2个回答
17
投票

我已经根据您的代码创建了一个完全可执行的示例项目。

一切顺利，您可以从我的github下载完整源代码https://github.com/mehditahmasebi/spring/tree/master/spring-xss-filter并运行命令“mvnw spring-boot:run”并在浏览器输入： http://localhost:8080/personService/test?name=foobar，这样你就可以在 XSSRequestWrapper.stripXSS 中看到结果。

希望这个源代码对你有帮助。

一些解释：

项目结构：

  • POM.xml
  • WebConfig.java 用于 Spring Web 配置
  • SpringBootApplication.java 用于启动应用程序
  • 您的类（PersonController.java、XSSFilter.java 和 XSSRequestWrapper.java）

深入研究它们，但我只是复制重要的几行：

pom.xml 

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>commons-lang</groupId>
        <artifactId>commons-lang</artifactId>
        <version>2.6</version>
    </dependency>
</dependencies>

WebConfig.java（在底行你可以看到你的bean）：

@Configuration
@EnableWebMvc
@EnableWebSecurity
public class WebConfig extends WebSecurityConfigurerAdapter implements WebMvcConfigurer {

    @Override
    protected void configure(HttpSecurity http) throws Exception {      
        http
            .authorizeRequests()
                .anyRequest().permitAll()
            .and().csrf().disable();
    }

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
        .allowCredentials(true)
        .allowedHeaders("*")
        .allowedMethods("GET, POST, PATCH, PUT, DELETE, OPTIONS")
        .allowedOrigins("*");
    }

    @Bean
    public FilterRegistrationBean xssPreventFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();

        registrationBean.setFilter(new XSSFilter());
        registrationBean.addUrlPatterns("/*");

        return registrationBean;
    }
}

SpringBootApplication.java（用于启动项目）：

@SpringBootApplication
public class SpringbootApplication extends SpringBootServletInitializer {

    /**
     * tomcat deployment needed
     */
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(SpringbootApplication.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringbootApplication.class, args);
        System.out.println("Spring boot application started!");

    }
}

其他 java 源文件与您完全相同，但有 2 个更改：

首先，我添加了一条 sysout 行来查看代码的跟踪而无需调试：

private String stripXSS(String value) {
    if(value != null)
        System.out.println("escapeHTML work successfully and escapeHTML value is : " + StringEscapeUtils.escapeHtml(value));
    return StringEscapeUtils.escapeHtml(value);
}

第二个变化是，我从 PersonController 评论了 escapeHtml 正如你所说这不是一个好主意：

  @RequestMapping( value= "/test" )
  private void getTest2(@RequestParam String name) {

      System.out.println(name);

//      System.out.println( StringEscapeUtils.escapeHtml(name) );

  }

您可以在我的github上找到所有源代码https://github.com/mehditahmasebi/spring/tree/master/spring-xss-filter

0
投票

一个简单的 XSS 过滤器实现。创建两个分别命名为 

XSSFilter
和 
XSSRequestWrapper
的 java 类，并分别使用以下实现

package com.example.config;

import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
@Order(1)
public class XSSFilter implements Filter {

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

    @Override
    public void destroy(){
    }

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

package com.example.config;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.util.regex.Pattern;

public class XSSRequestWrapper extends HttpServletRequestWrapper {
    
    private static Pattern[] patterns = new Pattern[]{
        Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE),
        Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
        Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
        Pattern.compile("</script>", Pattern.CASE_INSENSITIVE),
        Pattern.compile("<script(.*?)>",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
        Pattern.compile("eval\\((.*?)\\)",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
        Pattern.compile("expression\\((.*?)\\)",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL),
        Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE),
        Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE), 
        Pattern.compile("onload(.*?)=",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL)
    };
    
    public XSSRequestWrapper(HttpServletRequest servletRequest) {
        super(servletRequest);
    }
    
    @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] = stripXSS(values[i]);
        }
        
        return encodedValues;
    }
    
    @Override
    public String getParameter(String parameter){
        String value = super.getParameter(parameter);
        return stripXSS(value);
    }
    
    @Override
    public String getHeader(String name){
        String value = super.getHeader(name);
        return stripXSS(value);
    }
    
    private String stripXSS(String value){
        if (value != null){
            value = value.replaceAll("\0", "");
            for (Pattern scriptPatter: patterns){
                value = scriptPatter.matcher(value).replaceAll("");
            }
        }
        return value;
    }
}

以下行可以添加到应用程序的

main
类中

    @Bean("xssPreventFilter")
    public FilterRegistrationBean<XSSFilter> xssFilterFilter(){
        FilterRegistrationBean<XSSFilter> registrationBean = new FilterRegistrationBean<XSSFilter>();
        registrationBean.setFilter(new XSSFilter());
        registrationBean.addUrlPatterns("/*");
        return registrationBean;
    }
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