Copilot commented on code in PR #811:
URL: 
https://github.com/apache/skywalking-website/pull/811#discussion_r2724985288


##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \
+    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://js.hcaptcha.com 
https://*.hcaptcha.com; \
     connect-src 'self' https://*.algolianet.com https://*.algolia.net 
https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://*.hcaptcha.com; \
-    style-src 'self' 'unsafe-inline' https://hcaptcha.com 
https://*.hcaptcha.com; \
-    img-src 'self' data: https://hcaptcha.com https://*.hcaptcha.com; \
-    frame-ancestors 'self'; \
+    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://*.hcaptcha.com; \
+    style-src 'self' 'unsafe-inline' https:; \

Review Comment:
   The `style-src` directive has been changed from specific hcaptcha domains to 
a broad `https:` wildcard, which allows loading stylesheets from any HTTPS 
source. This loosens security compared to the previous configuration.
   
   While this may be intentional for flexibility, it reduces protection against 
potential attacks. If the application only needs styles from specific known 
domains, consider restricting this to those domains rather than allowing all 
HTTPS sources. For example, if you need styles from hcaptcha and specific CDNs, 
list them explicitly.
   ```suggestion
       style-src 'self' 'unsafe-inline' https://js.hcaptcha.com 
https://*.hcaptcha.com; \
   ```



##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \
+    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://js.hcaptcha.com 
https://*.hcaptcha.com; \
     connect-src 'self' https://*.algolianet.com https://*.algolia.net 
https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://*.hcaptcha.com; \
-    style-src 'self' 'unsafe-inline' https://hcaptcha.com 
https://*.hcaptcha.com; \
-    img-src 'self' data: https://hcaptcha.com https://*.hcaptcha.com; \
-    frame-ancestors 'self'; \
+    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://*.hcaptcha.com; \
+    style-src 'self' 'unsafe-inline' https:; \
+    img-src 'self' data: https:; \
+    font-src 'self' data: https:; \

Review Comment:
   The newly added `font-src` directive allows fonts from any HTTPS source with 
the broad `https:` wildcard. This is quite permissive and could potentially be 
exploited.
   
   If the application uses fonts from specific sources (like Google Fonts, 
Adobe Fonts, or specific CDNs), consider listing only those specific domains 
instead of allowing all HTTPS sources. If custom fonts are only served from 
your own domain, `font-src 'self' data:` would be more secure.
   ```suggestion
       font-src 'self' data:; \
   ```



##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \
+    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://js.hcaptcha.com 
https://*.hcaptcha.com; \
     connect-src 'self' https://*.algolianet.com https://*.algolia.net 
https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://*.hcaptcha.com; \
-    style-src 'self' 'unsafe-inline' https://hcaptcha.com 
https://*.hcaptcha.com; \
-    img-src 'self' data: https://hcaptcha.com https://*.hcaptcha.com; \
-    frame-ancestors 'self'; \
+    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://*.hcaptcha.com; \
+    style-src 'self' 'unsafe-inline' https:; \
+    img-src 'self' data: https:; \
+    font-src 'self' data: https:; \
+    media-src 'self' https:; \

Review Comment:
   The newly added `media-src` directive allows media from any HTTPS source 
with the broad `https:` wildcard. This is quite permissive.
   
   If the application serves media from specific sources (like your own domain 
or specific CDNs), consider listing only those specific domains instead of 
allowing all HTTPS sources. If media is only served from your own domain, 
`media-src 'self'` would be more secure. Note that video embeds from YouTube 
and Bilibili are already covered by `frame-src`, so `media-src` is for direct 
audio/video elements.
   ```suggestion
       media-src 'self'; \
   ```



##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \

Review Comment:
   The `default-src` directive has been significantly tightened from `'self' 
https: data: 'unsafe-inline'` to just `'self'`. While this is generally more 
secure, it means that any resource types without explicit directives will now 
be restricted to same-origin only.
   
   Missing explicit directives that may be needed:
   - `worker-src` - for web workers (if used)
   - `manifest-src` - for web app manifests (if used)
   - `child-src` - for workers and nested browsing contexts (deprecated but may 
be needed for compatibility)
   
   Please verify that the application doesn't use any resource types that 
aren't covered by the explicit directives now defined (script-src, connect-src, 
frame-src, style-src, img-src, font-src, media-src, object-src). Without the 
broader `default-src` fallback, these resources will be blocked.



##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \
+    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://js.hcaptcha.com 
https://*.hcaptcha.com; \
     connect-src 'self' https://*.algolianet.com https://*.algolia.net 
https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://*.hcaptcha.com; \
-    style-src 'self' 'unsafe-inline' https://hcaptcha.com 
https://*.hcaptcha.com; \
-    img-src 'self' data: https://hcaptcha.com https://*.hcaptcha.com; \
-    frame-ancestors 'self'; \
+    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://*.hcaptcha.com; \
+    style-src 'self' 'unsafe-inline' https:; \
+    img-src 'self' data: https:; \

Review Comment:
   The `img-src` directive has been changed from specific hcaptcha domains to a 
broad `https:` wildcard, which allows loading images from any HTTPS source. 
This loosens security compared to the previous configuration.
   
   While this provides flexibility, it reduces protection against potential 
image-based attacks or data exfiltration. If the application only needs images 
from specific known domains, consider restricting this to those domains rather 
than allowing all HTTPS sources. This is particularly important for user-facing 
applications where malicious actors might exploit this to load tracking pixels 
or other unwanted content.
   ```suggestion
       img-src 'self' data: https://js.hcaptcha.com https://*.hcaptcha.com; \
   ```



##########
.htaccess:
##########
@@ -1,13 +1,17 @@
 ErrorDocument 404 /404.html
 
 <IfModule mod_headers.c>
-    Header always set Content-Security-Policy "default-src 'self' https: data: 
'unsafe-inline'; \
-    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://hcaptcha.com https://*.hcaptcha.com; \
-    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://hcaptcha.com 
https://*.hcaptcha.com; \
+    Header always set Content-Security-Policy "default-src 'self'; \
+    script-src 'self' 'unsafe-inline' 'unsafe-eval' https://*.algolianet.com 
https://*.algolia.net https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://js.hcaptcha.com 
https://*.hcaptcha.com; \
     connect-src 'self' https://*.algolianet.com https://*.algolia.net 
https://*.algolia.io https://api.github.com 
https://kapa-widget-proxy-la7dkmplpq-uc.a.run.app https://*.hcaptcha.com; \
-    style-src 'self' 'unsafe-inline' https://hcaptcha.com 
https://*.hcaptcha.com; \
-    img-src 'self' data: https://hcaptcha.com https://*.hcaptcha.com; \
-    frame-ancestors 'self'; \
+    frame-src 'self' https://www.youtube.com https://player.bilibili.com 
https://*.hcaptcha.com; \
+    style-src 'self' 'unsafe-inline' https:; \
+    img-src 'self' data: https:; \
+    font-src 'self' data: https:; \
+    media-src 'self' https:; \
     object-src 'none'; \
+    frame-ancestors 'self'; \
+    base-uri 'self'; \
+    form-action 'self'; \
     upgrade-insecure-requests;"

Review Comment:
   The description claims this update will "enhance security," but several 
directives have been loosened from specific domains to broad `https:` wildcards 
(style-src, img-src, font-src, media-src). This actually reduces security by 
allowing resources from any HTTPS source rather than specific trusted domains.
   
   While the addition of `base-uri` and `form-action` directives does improve 
security in those specific areas, and tightening `default-src` is generally 
good, the overall net effect may not be a security enhancement due to the 
loosened resource directives. Please verify that this tradeoff is intentional 
and aligns with your security requirements.



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