springboot中怎么利用security自定义CSRF防御

今天就跟大家聊聊有关springboot中怎么利用security自定义CSRF防御，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。

查看csrfFilter源码，会先去HttpSessionCsrfTokenRepository.loadToken加载CsrfToken ，其实就是从session中获取。

public CsrfToken loadToken(HttpServletRequest request) {    HttpSession session = request.getSession(false);    if (session == null) {        return null;    }    return (CsrfToken) session.getAttribute(this.sessionAttributeName);}

如果不存在，会创建一个CsrfToken 并放入session

public void saveToken(CsrfToken token, HttpServletRequest request, HttpServletResponse response) {    if (token == null) {        HttpSession session = request.getSession(false);        if (session != null) {            session.removeAttribute(this.sessionAttributeName);        }    } else {        HttpSession session = request.getSession();        session.setAttribute(this.sessionAttributeName, token);    }}

之后会从request中取token，与从session中取出的token对比，所以这里开启csrf认证后，这四种请求是不验证csrf的"GET", "HEAD", "TRACE", "OPTIONS"，常用的POST请求，每次都要么在请求头上加上X-CSRF-TOKEN：csrf值，或者在POST中加入参数_csrf:csrf值,这样才能取出request中的csrf和session中的对比。

    String actualToken = request.getHeader(csrfToken.getHeaderName());    if (actualToken == null) {        actualToken = request.getParameter(csrfToken.getParameterName());    }    if (!csrfToken.getToken().equals(actualToken)) {        if (this.logger.isDebugEnabled()) {            this.logger.debug("Invalid CSRF token found for "                    + UrlUtils.buildFullRequestUrl(request));        }        if (missingToken) {            this.accessDeniedHandler.handle(request, response,                    new MissingCsrfTokenException(actualToken));        }else {            this.accessDeniedHandler.handle(request, response,                    new InvalidCsrfTokenException(csrfToken, actualToken));        }        return;    }

如果request中取出的csrf和session中取出的不相等，会进入accessDeniedHandler.handle，这个accessDeniedHandler是AccessDeniedHandlerImpl，里面方法如下：

public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException accessDeniedException)throws IOException, ServletException {    if(!response.isCommitted()) {      if(this.errorPage != null) {        request.setAttribute("SPRING_SECURITY_403_EXCEPTION", accessDeniedException);        response.setStatus(403);        RequestDispatcher dispatcher = request.getRequestDispatcher(this.errorPage);        dispatcher.forward(request, response);      } else {        response.sendError(403, accessDeniedException.getMessage());      }    }}

如果设置了errorPage会服务器内部转发到该路径，之后还是会经过security的各个filter进行登陆操作，最终登陆成功。这不是我要的，，所以需要自定义一个accessDeniedHandler。代码如下，如果不是登陆请求的 csrf不匹配，都退出当前用户，登陆用户不做csrf校验。

@Componentpublic class CsrfAccessDeniedHandler implements AccessDeniedHandler {    private SecurityContextLogoutHandler logoutHandler = new SecurityContextLogoutHandler();    @Autowired    private AjaxLogoutSuccessHandler ajaxLogoutSuccessHandler;    @Override    public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException e)        throws IOException, ServletException {        Authentication auth = SecurityContextHolder.getContext().getAuthentication();        logoutHandler.logout(request, response, auth);        ajaxLogoutSuccessHandler.onLogoutSuccess(request, response, auth);    }}

然后在securityConfig里配置

@Overrideprotected void configure(HttpSecurity http) throws Exception {    // 允许iframe    http.headers().frameOptions().sameOrigin();    //登陆页面不做csrf校验    http.csrf().ignoringAntMatchers("/login");    //异常处理    http.exceptionHandling().        accessDeniedHandler(csrfAccessDeniedHandler)}

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