[Webkit-unassigned] [Bug 245236] New: Content Blocking Rules `if-domain` mismatch when using URLScheme handler
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Sep 15 12:09:28 PDT 2022
https://bugs.webkit.org/show_bug.cgi?id=245236
Bug ID: 245236
Summary: Content Blocking Rules `if-domain` mismatch when using
URLScheme handler
Product: WebKit
Version: WebKit Local Build
Hardware: Mac (Apple Silicon)
OS: macOS 12
Status: NEW
Severity: Normal
Priority: P2
Component: New Bugs
Assignee: webkit-unassigned at lists.webkit.org
Reporter: bwaresiak at pm.me
Created attachment 462361
--> https://bugs.webkit.org/attachment.cgi?id=462361&action=review
Test cases demonstrating the issue
Overview
We are using URLScheme handler to test Content Blocking rule generation locally, without need for network connection. Since macOS 12 (and corresponding iOS release) we are running into an issue that some tests are consistently failing - Common point is ignore-previous-rules action with trigger that uses if-domain matching.
Steps to Reproduce
See attached file for a test case with an example: there are 4 combinations that should result in the same outcome: test page loading 3rd party resource through preconfigured scheme handler, but in one of the cases test fails (content blocker blocks the request).
Details of configuration:
Content blocking rules (made to block all traffic from otherhost.com but allow one certain resource on a certain website):
[ {
"action": { "type": "block" },
"trigger": { "url-filter": "testscheme://otherhost.com/.*" }
},
{
"action": { "type": "ignore-previous-rules" },
"trigger": { "url-filter": "testscheme://otherhost.com/img.png", "if-domain": [ "testhost.com" ] }
} ]
Static website embedding `<img src='testscheme://otherhost.com/img.png'>` resource.
If main page is set to testscheme://testhost.com test blocks img request (unexpected).
If main page is set to testscheme://testhost.com/index.html test allows img request (correct).
If we remove `"if-domain"` from trigger, both above cases allow img request (expected).
Build Date & Hardware
Happens on macOS 12 and recent iOS releases. Tested on revision 833c22ec9c71.
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