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[PING] Only allow triggering authentication from a foreground tab #237

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stephenmcgruer opened this issue Apr 6, 2023 · 4 comments · Fixed by #238
Closed

[PING] Only allow triggering authentication from a foreground tab #237

stephenmcgruer opened this issue Apr 6, 2023 · 4 comments · Fixed by #238
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privacy-needs-resolution Issue the Privacy Group has raised and looks for a response on.

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@stephenmcgruer
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During today's PING discussion and review of the changes to SPC, the PING raised a concern that removing the user activation requirement could lead to sites triggering SPC from a background tab. This could confuse users, especially as technically the spec doesn't require a tab-modal dialog (Chrome just implements SPC as a tab-modal UI, which I think any reasonable browser would, but it isn't enforced).

PING has asked that we add a normative step that SPC authentication should fail if the current tab is not foreground.
@stephenmcgruer
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I think this makes sense, a few thoughts:

  1. Is this already spec'd in Payment Request somewhere? I couldn't find it at a quick glance (just a check for an active document, which is not the same thing)
  2. This should probably be spec'd in Payment Request rather than here, I think. It seems applicable in general to Payment Request, and I think for Chrome we actually already check for not background tab and reject a Payment Request in that case.

@stephenmcgruer
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Jeffrey linked me to https://html.spec.whatwg.org/multipage/interaction.html#page-visibility as the concept we probably want to work from

@plehegar plehegar added the privacy-needs-resolution Issue the Privacy Group has raised and looks for a response on. label Apr 6, 2023
@pes10k pes10k mentioned this issue Apr 6, 2023
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@w3cbot w3cbot mentioned this issue Apr 7, 2023
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@ianbjacobs
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The show() method [1] algorithm includes this:

If document is not [fully active](https://html.spec.whatwg.org/multipage/document-sequences.html#fully-active), then return [a promise rejected with](https://webidl.spec.whatwg.org/#a-promise-rejected-with) an "[AbortError](https://webidl.spec.whatwg.org/#aborterror)" [DOMException](https://webidl.spec.whatwg.org/#idl-DOMException).

It does not sound like that suffices (no mention of page-visibility).

[1] https://w3c.github.io/payment-request/#show-method

@stephenmcgruer stephenmcgruer mentioned this issue Apr 11, 2023
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stephenmcgruer added a commit that referenced this issue Apr 13, 2023
@stephenmcgruer @jyasskin
[Spec] Only allow SPC authentication if in a foreground tab (#238)
4a9d883 
During PING review of the pre-CR changes to SPC, the PING raised a concern that removing the user activation requirement (see #236) could lead to sites triggering SPC from a background tab. This PR adds logic to the steps to check if a payment can be made to disallow background tabs (and minimized-windows/etc).

It is likely that eventually we will want this specified in Payment Request instead, both because it will be clearer spec text (here we have to refer to a this that is actually from the Payment Request spec), and also because we (in Chrome) already do (afaik) reject Payment Requests from background tabs. (Which is allowable by abusing the Payment Request spec text that says a user agent may reject show() for any security reason).

Fixes #237

Co-authored-by: Jeffrey Yasskin <[email protected]>
@ianbjacobs
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@samuelweiler, we've updated the specification based on the PING review. If satisfied, please do the relevant label management. :) Thank you!

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[Spec] Only allow SPC authentication if in a foreground tab w3c/secure-payment-confirmation
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@stephenmcgruer @plehegar @ianbjacobs