Springboot实现XSS漏洞过滤的示例代码

前阵子做了几个项目，终于开发完毕，进入了测试阶段，信心满满将项目部署到测试环境，然后做了安全测评之后.....

​(什么！你竟然说我代码不安全？？？)

然后测出了 Xss漏洞 安全的问题

场景：可以在页面输入框输入JS脚本， 攻击者可以利用此漏洞执行恶意的代码 ！

问题演示

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所以我们要对于前端传输的参数做处理，做统一全局过滤处理

既然要过滤处理，我们首先需要实现一个自定义过滤器

总共包含以下四部分

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最后我们需要在全局过滤器中使用我们实现的Xss自定义过滤器

XssFilterAtuoConfig实现代码

import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.module.SimpleModule;import net.greatsoft.overallbudget.filter.SimpleCORSFilter;import org.springframework.boot.context.embedded.FilterRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;/** * Created by wjy on 2020/11/5. * xss 自动配置类 */@Configurationpublic class XssFilterAtuoConfig { /** * 注册自定义过滤器 * @return */ @Bean public FilterRegistrationBean xssFiltrRegister() { FilterRegistrationBean registration = new FilterRegistrationBean(); //设置系统过滤器 (setFilter就是你所定义的过滤器filter类) registration.setFilter(new SimpleCORSFilter()); //过滤所有路径 registration.addUrlPatterns('/*'); //过滤器名称 registration.setName('XssFilter'); //优先级 registration.setOrder(1); return registration; } /** * 过滤JSON数据 * @return */ @Bean @Primary public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() { SimpleModule module = new SimpleModule(); //自定义序列化过滤配置(XssStringJsonDeserializer), 对入参进行转译 module.addDeserializer(String.class, new XssStringJsonDeserializer()); // 注册解析器 ObjectMapper objectMapper = Jackson2ObjectMapperBuilder.json().build(); objectMapper.registerModule(module); return new MappingJackson2HttpMessageConverter(objectMapper); }}

XssHttpServletRequestWrapper实现代码

/** * Created by wjy on 2020/11/5. * xss 包装 */public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper { public XssHttpServletRequestWrapper(HttpServletRequest request) { super(request); } /** * 对header处理 * @param name * @return */ @Override public String getHeader(String name) { String value = super.getHeader(name); return XssUtil.cleanXSS(value); } /** * 对参数处理 * @param name * @return */ @Override public String getParameter(String name) { String value = super.getParameter(name); return XssUtil.cleanXSS(value); } /** * 对数值进行处理 * @param name * @return */ @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++) {escapseValues[i] = XssUtil.cleanXSS(values[i]); } return escapseValues; } return super.getParameterValues(name); } /** * 主要是针对HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE 获取pathvalue的时候把原来的pathvalue经过xss过滤掉 */ @Override public Object getAttribute(String name) { // 获取pathvalue的值 if (HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE.equals(name)) { Map uriTemplateVars = (Map) super.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE); if (Objects.isNull(uriTemplateVars)) {return uriTemplateVars; } Map newMap = new LinkedHashMap<>(); uriTemplateVars.forEach((key, value) -> {if (value instanceof String) { newMap.put(key, XssUtil.cleanXSS((String) value));} else { newMap.put(key, value);} }); return newMap; } else { return super.getAttribute(name); } }}

XssStringJsonDeserializer代码实现

/** * Created by wjy on 2020/11/5. * 基于xss的JsonDeserializer */public class XssStringJsonDeserializer extends JsonDeserializer<String> { @Override public Class<String> handledType() { return String.class; } @Override public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException { return XssUtil.cleanXSS(jsonParser.getValueAsString()); }}

XssUtil代码实现

/** * Created by wjy on 2020/11/5. * xss工具类 */public class XssUtil { public static String cleanXSS(String value) { if (Objects.isNull(value)) { return value; } //在这里自定义需要过滤的字符 value = value.replaceAll('<', '& lt;').replaceAll('>', '& gt;'); value = value.replaceAll('(', '& #40;').replaceAll(')', '& #41;'); value = value.replaceAll('’', '& #39;'); value = value.replaceAll('eval((.*))', ''); value = value.replaceAll('['’][s]*javascript:(.*)['’]', ''''); value = value.replaceAll('<script>', ''); return value; }}

全局过滤器实现

@Componentpublic class SimpleCORSFilter implements Filter { @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { // 在这里，使用我们实现的XSS过滤器 XssHttpServletRequestWrapper request =new XssHttpServletRequestWrapper((HttpServletRequest) req); HttpServletResponse response = (HttpServletResponse) res; response.setHeader('Access-Control-Allow-Origin', '*'); response.setHeader('Access-Control-Allow-Methods','POST, GET, PUT, OPTIONS, DELETE'); response.setHeader('Access-Control-Max-Age', '3600'); response.setHeader('Access-Control-Allow-Headers','Origin, X-Requested-With, Content-Type, Accept, token');chain.doFilter(request, response); } public void init(FilterConfig filterConfig) { } public void destroy() { }}

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