On Wed, Nov 9, 2022 at 6:10 PM Mike Taylor <miketa...@chromium.org> wrote:
> On 10/27/22 11:49 PM, 'Daniel Vogelheim' via blink-dev wrote: > > Hello all, > > The approval for the Intent To Ship for Origin Isolation By Default / > Deprecate document.domain > <https://groups.google.com/a/chromium.org/g/blink-dev/c/_oRc19PjpFo/> > asks for a separate intent for the actual default change > <https://groups.google.com/a/chromium.org/g/blink-dev/c/_oRc19PjpFo/m/Ybgtf3JfAQAJ>. > This is that separate intent. > > A summary of what happened so far: > > - Shipping Origin Isolation by Default (and thereby deprecating > document.domain) has security benefits, but compatibility risk. > > - We added warnings to the developer console and issues panel, published a > blog post, and engaged in direct outreach. This has resulted in > substantial, measurable reduction of usage. Some sites keep using > document.domain, but have mitigated the deprecation with other means. This > makes the risk difficult to measure. > > - Sampling of sites with document.domain usage and manual inspection > yields a potential breakage estimate at ~0.015% of page views. > > What we're asking for here is: > > - Enable the feature at 50% for beta (+ dev + canary) during M109, as a > "last call" for web site authors. > > This sounds like a good idea. Is there any reason we couldn't go to 50% in > M108 as well (or are you trying to avoid breakage over the winter holidays)? > No reason. I'd be happy to go to beta as soon as I receive the lgtms. I had conservatively budgeted that to be 109. :-) > Another question: do we have enterprise policies available for this change? > Yes; the policy is here: OriginAgentClusterDefaultEnabled <https://source.chromium.org/chromium/chromium/src/+/main:components/policy/resources/templates/policy_definitions/Miscellaneous/OriginAgentClusterDefaultEnabled.yaml> > - Launch on stable on M110. (~ Feb '23, so >12 weeks out from today) > > > ------------------------ > > Contact emails v...@chromium.org, vogelh...@chromium.org > Specification Explainer: > https://github.com/mikewest/deprecating-document-domain HTML Spec draft: > https://github.com/whatwg/html/compare/main...otherdaniel:dd > API spec Yes > Summary > > This is a follow-on to the Intent to Ship: Origin Isolation By Default / > Deprecate document.domain > <https://groups.google.com/a/chromium.org/g/blink-dev/c/_oRc19PjpFo/>. We'd > like to ship this in M110, stable. > > Summary (of the underlying change) Change the default behavior of the > Origin-Agent-Cluster: header / document.domain settability. > Presently, pages within Chromium have site-keyed agent clusters by > default, unless the Origin-Agent-Cluster: header is explicitly set to true. > This accommodates pages or frames which want to access each other's state, > despite being on different origins (but within a site). This is fine for > any pages that wish to do so, but because a page *might* set > document.domain later on, Chromium currently must use site-keyed agent > clusters for *all* pages by default even though the overwhelming majority > of pages do not ever make use of this (mis-)feature. In turn, this requires > Chromium to use sites as the basis for renderer process isolation (via Site > Isolation), which exposes origins to same-site but cross-origin attacks > involving compromised renderer processes or the "Spectre" family of > side-channel attacks. > This proposal changes the default behaviour of Origin-Agent-Cluster. From > a developer's point of view, the new default matches "Origin-Agent-Cluster: > ?1". The initial implementation will use origin-keyed agent clusters for > all (non-opted out) origins, without changing how many processes Chromium > creates. Over time, we can then adapt Chromium's isolation strategy towards > origin-keyed processes without further affecting web-visible behaviour. > The developer-visible aspect of this is that for pages with origin-keyed > agent clusters, document.domain is no longer settable. Thus, we have marked > this intent as a deprecation. > Note that this proposal is about the default. Both modes - site-keyed or > origin-keyed agent clusters - remain available to any site, but > origin-keyed agent clusters change from opt-in to opt-out. The current > behaviour remains available by setting "Origin-Agent-Cluster: ?0". > Blink component Blink>SecurityFeature > TAG review https://github.com/w3ctag/design-reviews/issues/564 > Risks: Interoperability and Compatibility > > There are compatibility risks, which we have reduced with outreach and > warnings, and we want to mitigate further by launching at 50% of beta > first. An extended discussion of the risk (including attempts at > quantitative assessment) can be found in the original intent to ship > <https://groups.google.com/a/chromium.org/g/blink-dev/c/_oRc19PjpFo/>. > > Gecko: Standards position request > <https://github.com/mozilla/standards-positions/issues/601>. ("Worth > prototyping") > > WebKit: > https://lists.webkit.org/pipermail/webkit-dev/2021-December/032067.html > (No signals.) > > Web developers: No signals. > > Activation - Deprecation plan > M109: Enable "Origin Agent Cluster by Default" for 50% of page loads on > beta, dev, and canary. > > M110: Enable "Origin Agent Cluster by Default" on stable. > Security This change should be security-positive, since setting > document.domain will not have any impact on the origin of the document any > more. > Debuggability A deprecation warning has been added to DevTools console > and to the issues panel in M98. This warning will file a deprecation report > as well using the Reporting API, if so configured. > Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, Chrome OS, Android, and Android WebView)? Yes > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> > ? This is covered by Origin-keyed Agent Cluster tests > <https://wpt.live/html/browsers/origin/origin-keyed-agent-clusters/>. > Tracking bug https://crbug.com/1139851 > Launch bug https://crbug.com/1246823 > Link to entry on the Chrome Platform Status > https://chromestatus.com/feature/5428079583297536 (document.domain setter > deprecation) https://chromestatus.com/features/5683766104162304 > (Origin-keyed agent clusters) > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to blink-dev+unsubscr...@chromium.org. > To view this discussion on the web visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CALG6KPNEMgvrOehp5%2Bf48yQ62pY3xqXqATPNxWZ6aYQ%2BXeHHAg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CALG6KPNEMgvrOehp5%2Bf48yQ62pY3xqXqATPNxWZ6aYQ%2BXeHHAg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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