如何仅回复我们的网络表单

Question

这可能是一般性问题。

我在example.com上的网络服务器上有一个网络表单。数据被发布（POST）到返回一些数据的PHP页面。

但是如何阻止我的PHP页面响应任何地方托管的表单副本？

我知道HTTP_REFERER是一个坏主意，因为它可以在客户端更改。 我在隐藏字段中考虑过JSON Web令牌（JWT），但它可以从表单页面中删除并以localhost形式使用。

这个问题有安全的方法吗？

Answer 1

没有

您网络服务器的优势超出了您的控制范围。

任何人都可以使用他们喜欢的任何客户端（包括他们键入原始HTTP命令的Ax, Ay, Bx, By 客户端）提交他们喜欢的任何HTTP请求。

Anti-CSRF令牌（这是您在JWT中的目的）可以阻止第三方欺骗登录用户提交错误请求：但这是您要做的最好的得到。

Answer 2

您正在考虑CRSF令牌 - 但它可以通过卷曲废弃并以任何其他形式使用。正如@Quentin所提到的那样 - 只会让其他人更难使用 - 根本不安全。

Answer 3

我部分不同意@ quentin的回答。

您可以通过php创建唯一标记，将其保存在服务器端并将其传递给obfuscated js代码块。然后，混淆的js会将令牌写入COOKIE或local storage，用于在表单提交时与服务器令牌进行匹配，不用说没有js的客户端启用（curl，wget等等）无法运行此代码 混淆js而不是常规js的目的是防止没有js的客户废弃我们的网页，窃取唯一令牌并使用它来提交冒充有效用户的表单，正如@ bigwolks的答案所述 确保令牌仅在有限的时间内有效，以防止重复使用 此设置需要自定义以适应每个特定项目，但事实证明，这是针对我项目中非js客户端的自动提交的有效防御措施。

模糊js示例：

＆＃13;

＆＃13;

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＆＃13;

＆＃13;

＆＃13;

PS：并非所有JavaScript混淆器都有效。由于选项数量很多，我发现obfuscator.io是最好的选项之一，特别是Domain lock和Debug Protection选项。 根据创作者的说法，它不会＆＃34; ＆＃34;恢复混淆代码（请阅读有关＆＃34; 不可能＆＃34;的评论）：