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johann...@chromium.org, cfred...@chromium.org, y...@chromium.org Explainer https://github.com/explainers-by-googlers/storage-access-for-fedcm Specification None (TBD) Summary Reconciles the FedCM and Storage Access APIs by making a prior FedCM grant a valid reason to automatically approve a storage access request. When a user grants permission for using their identity with a 3rd party Identity Provider (IdP) on a Relying Party (RP), many IdPs require third-party cookies to function correctly and securely. This proposal aims to satisfy that requirement in a private and secure manner by updating the Storage Access API (SAA) permission checks to not only accept the permission grant that is given by a storage access prompt, but also the permission grant that is given by a FedCM prompt. A key property of this mechanism is limiting the grant to cases explicitly allowed by the RP via the FedCM permissions policy, enforcing a per-frame control for the RP and preventing passive surveillance by the IdP beyond the capabilities that FedCM already grants, as outlined in the Privacy Considerations <https://github.com/explainers-by-googlers/storage-access-for-fedcm?tab=readme-ov-file#privacy-considerations> . Blink component Blink>StorageAccessAPI TAG review None TAG review status N/A Risks Interoperability and Compatibility None Gecko: No public signals, positive initial signals <https://docs.google.com/document/d/1jxqW4kvGdclIWsOlWMXWLGpwu1wOorST2Ol6vJKAjDE/edit#heading=h.y0ecc5cfr86n>. We will request a formal position. WebKit: No signal. We will request a formal position. Web developers: Positive <https://github.com/fedidcg/FedCM/issues/467> Other signals: WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? N/A, not shipping on Android WebView. Goals for experimentation Evaluate the implementation, and the usability of the feature to ensure it adequately solves the problem. Ongoing technical constraints None Debuggability None Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? No. It will not be supported in Android WebView. Is this feature fully tested by web-platform-tests? No. The implementation is primarily in permissions code in //chrome, which cannot be tested in WPTs since WPTs use a fake permission manager <https://crsrc.org/c/content/web_test/browser/web_test_permission_manager.h;drc=33b441e83b1f70381158fcafb0ecde9168b79524;l=28> in Chromium. Flag name on chrome://flags #fedcm-with-storage-access-api Finch feature name FedCmWithStorageAccessAPI Non-finch justification None Requires code in //chrome? True Estimated milestones M126 through M127 (inclusive). Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5116478702747648 Links to previous Intent discussions Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAD_OO4iogs7O60r0YcVnDB5aCvs9WUYjWFcuHqcFi5bXLRBOig%40mail.gmail.com This intent message was generated by Chrome Platform Status. -- 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/9a75fe74-ca55-4ddc-93d7-120adfdee49en%40chromium.org.
