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Explainer No information provided Specification https://wicg.github.io/background-fetch Summary Background Fetch requests will now require that the service worker's origin has the necessary Local Network Access (LNA) permission in order to send requests to local or loopback servers. This aligns Chromium's implementation with the intent of the Background Fetch spec (that such requests go through the Fetch spec and have the same security policies applied to them, in this case Local Network Access checks). This prevents sites from bypassing LNA checks by using Background Fetch instead of regular Fetch. For enterprises, you can use existing Local Network Access enterprise policies in the same way you previously would have for regular Fetch API requests from service workers (see [LocalNetworkAccessRestrictionsTemporaryOptOut](https://chromeenterprise.google/policies/#LocalNetworkAccessRestrictionsTemporaryOptOut), [LocalNetworkAccessAllowedForUrls](https://chromeenterprise.google/policies/#LocalNetworkAccessAllowedForUrls), [LoopbackNetworkAllowedForUrls](https://chromeenterprise.google/policies/#LoopbackNetworkAllowedForUrls), [LocalNetworkAccessPermissionsPolicyDefaultEnabled](https://chromeenterprise.google/policies/#LocalNetworkAccessPermissionsPolicyDefaultEnabled), and [LocalNetworkAccessIpAddressSpaceOverrides](https://chromeenterprise.google/policies/#LocalNetworkAccessIpAddressSpaceOverrides)). Blink component Blink>BackgroundFetch Web Feature ID local-network-access Motivation This fixes a security issue where Background Fetch unintentionally bypasses security policies such as Local Network Access checks. Initial public proposal No information provided TAG review No information provided TAG review status Not applicable Goals for experimentation None Risks Interoperability and Compatibility If the service worker's origin does not yet have the requisite Local Network Access permission, the background fetch request may fail. However, overall usage of Background Fetch is extremely low. We considered completely removing the ability for Background Fetch to make local network requests, which would be more disruptive. Treating Background Fetch requests the same as fetch() calls from a service worker context was deemed an appropriate middle ground. Gecko: Shipped/Shipping (https://github.com/mozilla/standards-positions/issues/1260) Firefox is shipping LNA but does not support the BG Fetch API WebKit: No signal (https://github.com/WebKit/standards-positions/issues/520) Web developers: No signals 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? LNA checks are not enforced in WebView. Debuggability No information provided Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? No LNA is not enforced in WebView. Is this feature fully tested by web-platform-tests? Yes Flag name on about://flags No information provided Finch feature name BackgroundFetchLocalNetworkAccess Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://crbug.com/455486148 Estimated milestones Shipping on desktop 154 Shipping on Android 154 Anticipated spec changes Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (eg links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (eg, changing to naming or structure of the API in a non-backward-compatible way). None. This brings Chromium's implementation into alignment with the intent of the Background Fetch spec (which delegates security policy enforcement to the Fetch spec). Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6225598451154944?gate=6680716673941504 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 [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6a7fa049.57cdfc94.1bf3cb.00e4.GAE%40google.com.
