Bug 187197 – REGRESSION (r230921): Cannot log in to forums.swift.org using GitHub account

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Daniel Bates]

Seen with top-of-tree WebKit on macOS Mojave.

Steps to reproduce:

1. Visit <https://forums.swift.org>.
2. Click Log In.
3. In the Log In overlay, click the "with GitHub" button.
4. In the GitHub pop up window, sign in with your Github credentials, if applicable.
5. Click the "Authorize apple" button.

Then you should see an "Authorization complete" message. But I see a Github error page with text "What? \\ Your browser did something unexpected. Please contact us if the problem persists."

[Daniel Bates]

<rdar://problem/40420821>

[Daniel Bates]

The issue is that we consider the origin of the pop-up window opener when determining whether to send Same-Site cookies for a request to be loaded in the pop-up regardless of whether the request was initiated by the opener. We should only consider the opener's origin for the first non-empty document load in the pop-up window. (An about:blank pop-up is same-origin with its opener; => it is Same-Site with its opener).

With regards to the sign in flow for forums.swift.org using a GitHub account, subsequent navigations/form submissions in the GitHub pop-window after initial load are considered cross-origin (because they are compared against the opener, forums.swift.org). But they should be considered same-origin because all the subsequent navigations/form submissions are to https://github.com pages.

Additional remarks:

In <https://trac.webkit.org/changeset/230921/> (bug #159464) we added support for Same-Site cookies on Mac when running on macOS Mojave or later. And GitHub is making use of Same-Site cookies. This issue does not occur on earlier version of macOS as treat Same-Site cookies equivalent to non-Same-Site cookies.

[Daniel Bates]

Created attachment 343955 [details]
[Screenshot] GitHub error page on Mojave

Screenshot of the error page seen on macOS Mojave after following the reproduction steps.

[Daniel Bates]

Created attachment 343963 [details]
Patch and layout tests

[Brent Fulgham]

Comment on attachment 343963 [details]
Patch and layout tests

View in context: https://bugs.webkit.org/attachment.cgi?id=343963&action=review

r=me, but please be sure EWS is happy before landing.

> Source/WebCore/ChangeLog:9
> +        Fixes an issue where a Same-Site cookies are not sent with any child window load if the

"... where Same-Site cookies"

[EWS Watchlist]

Comment on attachment 343963 [details]
Patch and layout tests

Attachment 343963 [details] did not pass mac-wk2-ews (mac-wk2):
Output: https://webkit-queues.webkit.org/results/8389065

New failing tests:
css3/filters/backdrop/add-remove-add-backdrop-filter.html

[EWS Watchlist]

Created attachment 343980 [details]
Archive of layout-test-results from ews107 for mac-sierra-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews107  Port: mac-sierra-wk2  Platform: Mac OS X 10.12.6

[Daniel Bates]

(In reply to Build Bot from comment #6)
> Comment on attachment 343963 [details]
> Patch and layout tests
> 
> Attachment 343963 [details] did not pass mac-wk2-ews (mac-wk2):
> Output: https://webkit-queues.webkit.org/results/8389065
> 
> New failing tests:
> css3/filters/backdrop/add-remove-add-backdrop-filter.html

As far as I can tell this failure is not related to the change made in the proposed patch.

[Daniel Bates]

(In reply to Daniel Bates from comment #8)
> (In reply to Build Bot from comment #6)
> > Comment on attachment 343963 [details]
> > Patch and layout tests
> > 
> > Attachment 343963 [details] did not pass mac-wk2-ews (mac-wk2):
> > Output: https://webkit-queues.webkit.org/results/8389065
> > 
> > New failing tests:
> > css3/filters/backdrop/add-remove-add-backdrop-filter.html
> 
> As far as I can tell this failure is not related to the change made in the
> proposed patch.

Additionally, I am unable to reproduce this failure on my machine with the patch applied.

[Daniel Bates]

Comment on attachment 343963 [details]
Patch and layout tests

Clearing flags on attachment: 343963

Committed r233387: <https://trac.webkit.org/changeset/233387>

[Daniel Bates]

All reviewed patches have been landed.  Closing bug.