今天接到安全团队的说swagger有未授权访问漏洞，即使在swagger关闭的情况下http://127.0.0.1:8086/agcloud/v2/api-docs?group=%E7%94%A8%E6%88%B7%E5%85%B3%E8%81%94%E4%BF%A1%E6%81%AF%E6%A8%A1%E5%9D%97仍然还能访问。

看了下原来是有写一个拦截器

registry.addInterceptor(loginInterceptor).addPathPatterns("/v2/api-docs");registry.addInterceptor(loginInterceptor).addPathPatterns("/swagger-ui.html");

断点之后发现是有生效的，/swagger-ui.html不能再访问，但是/v2/api-docs路径还是可以访问，确定拦截器有生效，不是拦截器的问题。

查看基于springMVC请求入口找到DispatcherServlet类，找到doDispatch方法

protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception {......try {// HandlerMapping根据请求路径选择对应的handler（controller下的某个方法）来处理当前请求// 补充下HandlerMapping：// 1. 根据当前请求的找到对应的 Handler，// 2. 将 Handler（执行程序）与一堆 HandlerInterceptor（拦截器）封装到 HandlerExecutionChain 对象中// 3. DispatcherServlet会从容器中取出所有HandlerMapping实例并遍历，让HandlerMapping实例根据自己实现类的方式去尝试查找HandlermappedHandler = getHandler(processedRequest);......// 根据handler来找到支持它的HandlerAdapter，通过HandlerAdapter执行这个最后的代码处理逻辑得到具体的返回结果HandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler());......// 拦截器preHandle处理，按顺序执行if (!mappedHandler.applyPreHandle(processedRequest, response)) {return;}// handlerAdapter实际的执行逻辑mv = ha.handle(processedRequest, response, mappedHandler.getHandler());......// 拦截器postHandle处理mappedHandler.applyPostHandle(processedRequest, response, mv);} catch (Throwable err) {......} finally {......}}

在doDispatch方法中，拦截器的preHandle执行逻辑在mappedHandler.applyPreHandle中，接下来我看下这个方法：

boolean applyPreHandle(HttpServletRequest request, HttpServletResponse response) throws Exception { // 遍历handler绑定的所有interceptors，按顺序执行preHanlde方法for (int i = 0; i < this.interceptorList.size(); i++) {HandlerInterceptor interceptor = this.interceptorList.get(i);// 如果preHandle返回false，则触发afterCompletion方法的执行if (!interceptor.preHandle(request, response, this.handler)) {triggerAfterCompletion(request, response, null);return false;}this.interceptorIndex = i;}return true;}

debug跟踪到这个方法，发现applyPreHandle方法中this.interceptorList的长度为0，即处理该请求的handler没有绑定任何interceptor。这个时候很容易想到问题可能出现在handlerMapping上，因为handlerMapping负责将handler与一堆 handlerInterceptor（拦截器）封装到 HandlerExecutionChain 对象中

doDispatch中的getHandler方法断点

解决方案：

package com.augurit.swj.config.filter;import org.springframework.beans.factory.annotation.Value;import org.springframework.core.MethodParameter;import org.springframework.http.HttpStatus;import org.springframework.http.MediaType;import org.springframework.http.server.ServerHttpRequest;import org.springframework.http.server.ServerHttpResponse;import org.springframework.web.bind.annotation.RestControllerAdvice;import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;import java.util.Arrays;import java.util.List;/** * @ClassName: SwaggerAdvice * @Author: zy * @Date: 2023/03/06 10:54 * @Description: * 自定的HanderMapping初始化未绑定拦截器，导致拦截器失效 * 通过ResponseBodyAdvice配合@ControllerAdvice注解，在请求响应体返回之前，校验请求URL * */@RestControllerAdvicepublic class SwaggerAdvice implements ResponseBodyAdvice {@Value("${agcloud.framework.swagger.enable}")private boolean swaggerEnable;private static final List EXCLUDE_URL = Arrays.asList("/v2/api-docs");@Overridepublic Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {String url = serverHttpRequest.getURI().getHost() + serverHttpRequest.getURI().getPath();//增加判断，只有配置文件打开了swagger才能访问if(swaggerEnable == true){return o;}if (EXCLUDE_URL.stream().anyMatch(item -> url.contains(item))) {serverHttpResponse.setStatusCode(HttpStatus.FORBIDDEN);return "没有权限";}return o;}@Overridepublic boolean supports(MethodParameter methodParameter, Class aClass) {return true;}}

参考：记一次自定义拦截器失效的问题排查 – 简书