前端安全之常见问题总结

目录

正文

一、XSS(Cross Site Scripting) 跨站 JS 脚本攻击,如何防范?

  1. 针对接口进行 XSS 攻击,即把js脚本或者带恶意 js 脚本的 html 标签,作为 GET 或者 POST 参数提交到服务器,然后服务器解释并响应,在响应结果里把脚本或者 html 标签原样返回明显示和执行。这明显是很有问题。防范方式:1)提交数据前前端要做数据校验,对用户输入的信息 (js 代码及 dom 节点) 进行过滤。2)对重要的 cookie 设置为 httponly(服务器端可设置此字段),客户端就没有操作此 cookie 的权限。3)服务器端也要数据合法性校验
  2. 针对 DOM 本身进行 XSS 攻击,如果本身页面代码中使用了 window.eval 来执行代码。eval 本身会把一段字符串变成可执行的 js 代码,这是非常危险的。还有拼接 html 字符串后直接显示 DOM 时也会遇到同样的问题。防范方式:尽量避免使用 eval,拼接 html 字符串时应校验字符串的合法性,过滤非法元素节点与属性节点, 如 iframe,script 标签,onerror 事件, style, src, href 等。

可能产生危害:泄露了个人的 cookie 信息,身份认证被套取后,被用作非法用途

非法字符过滤可以使用第三方的过滤库如:HTMLParser.jshe.js

参考引用自:https://www.cnblogs.com/unclekeith/p/7750681.html

二、CSRF (Cross-site request forgery) 跨站请求 (GET 和 POST) 伪造攻击,如何防范?

由于浏览器一般都是可同时打开多标签的。举个例了,现浏览器同时打开了两个标签,一个是已被合法登录并保持登录状态的网站 A,另外一个是已被欺骗打开的含恶意代码的网站 B(不一定是来源于非法网站,也可能藏在各大合法论坛上的一些非法链接被你打开了),则可以通过在恶意网站 B 上静态或者动态创建 img, script 等标签发起 GET 或者 POST 请求,发出的恶意请求是身份认证后的,这就构成 CSRF 攻击了。将其 src 属性指向发起对 A 网站的接口请求(如一个 GET 请求:api.a.com/blog/del?id=1)。通过标签的方式发起的请求不受同源策略的限制。

可能产生危害:模拟表单提交盗取用户资金,篡改目标网站上的用户数据,盗取用户隐私数据

防范方式:

1)后端接口要对接口请求来源如(* Referer:)字段进行合法校验。

2)添加 token,带 token 请求。

参考引用自:https://www.cnblogs.com/unclekeith/p/7788057.html

三、SQL 注入,攻击如何防范?

老生常谈的了,总之:

1.永远不要信任用户的输入。对用户的输入进行校验,可以通过正则表达式,或限制长度;对单引号和

双 “-” 进行转换等。

2.永远不要使用动态拼装 sql,可以使用参数化的 sql 或者直接使用存储过程进行数据查询存取。

3.永远不要使用管理员权限的数据库连接,为每个应用使用单独的权限有限的数据库连接。

4.不要把机密信息直接存放,加密或者 hash 掉密码和敏感的信息

5.应用的异常信息应该给出尽可能少的提示,最好使用自定义的错误信息对原始错误信息进行包装

6.sql 注入的检测方法一般采取辅助软件或网站平台来检测,软件一般采用 sql 注入检测工具 jsky, 网站平台就有亿思网站安全平台检测工具。

参考引用自:https://www.cnblogs.com/sdya/p/4568548.html

四、接口访刷问题,前端如何与后端配合?

在 IT 行业混得有一点资历的人估计都会遇到过接口被刷的情况了。如:听说搞某某活动,大奖瞬间被刷走。某某营销活动,奖品瞬间被抢光了。某某平台,短信验证码几天被刷到欠费。

认真去查查记录,发现这些行为都是人家用机器写程序自动刷你接口的。现在还有卡商有各种短信接码平台,专业批量接发验证码的。

如何能更好的做接口防刷:

1.发送请求之前前端这边要做人机识别。(如微信的静默授权返回一次唯一码,小程序的 wx.login 接口返回的 code,可供后端二次验证,还有发送短信验证码前要手动先输入验证码,或者使用拖动方块填充缺块那种人机识明系统)

2.接口传参要带加密签名。

五、前端常用的js加密方式有哪些?

sha1,base64,md5,aes, SHA256,SHA512,RMD160 等

常用开源库有:

https://github.com/blueimp/JavaScript-MD5
https://github.com/h2non/jshashes
https://github.com/dankogai/js-base64
https://github.com/auth0/jwt-decode

 

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