nginx Content-Security-Policy Header 仍然阻塞 bootstrapcdn

Question

我的 nginx.conf 中有以下内容

add_header Content-Security-Policy 
    "default-src 'self'; 
    img-src 'self' 'unsafe-inline' 'unsafe-eval' data: *.printfriendly.com *.w.org *.gravatar.com *.vimeocdn.com; 
    script-src 'self' 'unsafe-inline' 'unsafe-eval' *.w.org *.gravatar.com *.googleapis.com *.jsdelivr.net *.printfriendly.com *.kxcdn.com *.vimeocdn.com *.hs-analytics.net *.securitymetrics.com *.google-analytics.com; 
    style-src 'self' 'unsafe-inline' *.googleapis.com *.bootstrapcdn.com *.gstatic.com *.vimeocdn.com; 
    font-src 'self' data: *.googleapis.com *.bootstrapcdn.com *.gstatic.com *.googleapis.com; 
    frame-src 'self' *.vimeocdn.com *.vimeo.com; 
    object-src 'self'";

(我不得不将它多行以使其清晰...)

但是，在我的站点中，我仍然收到此错误:

Content Security Policy: The page’s settings blocked the loading of a resource at http://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.css (“style-src”).

当它在上面列入白名单时，您知道为什么会发生这种情况吗？

Answer 1

正如@tarun-lalwani 提到的，另一个 block 中的任何 add_header 指令都可能很重要。更准确地说，如果在后代 block 中使用 add_header(对于任何 header )，则此 Content-Security-Policy 将在此类后代 block 中被丢弃。

摘自 documentation :

These directives are inherited from the previous level if and only ifthere are no add_header directives defined on the current level.

为避免代码复制 (DRY)，可以使用变量或 include 指令(或在大量情况下生成 nginx 配置)。

以防万一，在实际配置中不应使用多行 header 值。通过 curl -I https://example.com/path 检查您的服务器响应。为了提高配置的可读性，可以使用变量。

例子:

set $CSP_image  "img-src      'self' 'unsafe-inline' 'unsafe-eval' data: *.printfriendly.com *.w.org *.gravatar.com *.vimeocdn.com; ";
set $CSP_script "script-src   'self' 'unsafe-inline' 'unsafe-eval' *.w.org *.gravatar.com *.googleapis.com *.jsdelivr.net *.printfriendly.com *.kxcdn.com *.vimeocdn.com *.hs-analytics.net *.securitymetrics.com *.google-analytics.com; ";
set $CSP_style  "style-src    'self' 'unsafe-inline' *.googleapis.com *.bootstrapcdn.com *.gstatic.com *.vimeocdn.com; ";
set $CSP_font   "font-src     'self' data: *.googleapis.com *.bootstrapcdn.com *.gstatic.com *.googleapis.com; ";
set $CSP_frame  "frame-src    'self' *.vimeocdn.com *.vimeo.com; ";
set $CSP_object "object-src   'self' ; ";
set $CSP        "default-src  'self' ; ${CSP_image} ${CSP_script} ${CSP_style} ${CSP_font} ${CSP_frame} ${CSP_object}";

add_header Content-Security-Policy $CSP;