On Monday, November 29, 2021 at 4:37:24 PM UTC+1 Titouan Rigoudy wrote:
> Contact emailstito...@chromium.org, v...@chromium.org, cl...@chromium.org > > Explainer > https://github.com/WICG/private-network-access/blob/main/explainer.md > > Specificationhttps://wicg.github.io/private-network-access/ > > Design docs > > https://docs.google.com/document/d/1FYPIeP90MQ_pQ6UAo0mCB3g2Z_AynfPWHbDnHIST6VI/edit > > Summary > > Sends a CORS preflight request ahead of any private network requests for > subresources, asking for explicit permission from the target server. A > private network request is any request from a public website to a private > IP address or localhost, or from a private website (e.g. intranet) to > localhost. Sending a preflight request mitigates the risk of cross-site > request forgery attacks against private network devices such as routers, > which are often not prepared to defend against this threat. > > > Blink componentBlink>SecurityFeature>CORS>PrivateNetworkAccess > <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ESecurityFeature%3ECORS%3EPrivateNetworkAccess> > > TAG reviewhttps://github.com/w3ctag/design-reviews/issues/572 > > TAG review statusPending > > Risks > > > Interoperability and Compatibility > > The main interoperability risk, as always, is if other browser engines do > not implement this. Compat risk is straightforward: web servers that do not > handle the new preflight requests will eventually break, once the feature > ships. The plan to address this is as follows: 1. Send preflight request, > ignore result, always send actual request. Failed preflight requests will > result in a warning being shown in devtools. > Would that include deprecation reports? > 2. Wait for 3 milestones. 3. Gate actual request on preflight request > success, with deprecation trial for developers to buy some more time. > We'd also need to communicate this widely in order to get relevant developers to sign up for the deprecation trial. UKM investigation can help us focus efforts on that front. > 4. End deprecation trial 4 milestones later. UseCounters: > https://chromestatus.com/metrics/feature/timeline/popularity/3753 > https://chromestatus.com/metrics/feature/timeline/popularity/3755 > https://chromestatus.com/metrics/feature/timeline/popularity/3757 > That's a lot of usage :/ I remember you did a bunch of UKM investigations in the past. Did that include this case as well? > The above measure pages that make at least one private network request for > which we would now send a preflight request. > > > Gecko: Worth prototyping ( > https://github.com/mozilla/standards-positions/issues/143) > > WebKit: No signal ( > https://lists.webkit.org/pipermail/webkit-dev/2021-November/032040.html) > Pending response. > > Web developers: No signals Anecdotal evidence so far suggests that most > web developers are OK with this new requirement, though some do not control > the target endpoints and would be negatively impacted. > > Other signals: > > Ergonomics > > None. > > > Activation > > Gating access to the private network overnight on preflight requests would > likely result in widespread breakage. This is why the plan is to first send > requests but not act on their result, giving server developers time to > implement code handling these requests. Deprecation warnings will be > surfaced in DevTools to alert web/client developers when the potential for > breakage later on is detected. Enforcement will be turned on later (aiming > for 3 milestones), along with a deprecation trial for impacted web > developers to buy themselves some more time. Experience suggests a large > fraction of developers will not notice the advance deprecation warnings > until things break. > > > Security > > This change aims to be security-positive, preventing CSRF attacks against > soft and juicy targets such as router admin interfaces. DNS rebinding > threats were of particular concern during the design of this feature: > https://docs.google.com/document/d/1FYPIeP90MQ_pQ6UAo0mCB3g2Z_AynfPWHbDnHIST6VI/edit#heading=h.189j5gnadts9 > > > Debuggability > > Relevant information (client and resource IP address space) is already > piped into the DevTools network panel. Deprecation warnings and errors will > be surfaced in the DevTools issues panel explaining the problem when it > arises. > > > Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> > ?Yes > > DevTrial instructions > https://github.com/WICG/private-network-access/blob/main/HOWTO.md > > Flag namePrivateNetworkAccessRespectPreflightResults > > Requires code in //chrome?False > > Tracking bughttps://crbug.com/591068 > > Launch bughttps://crbug.com/1274149 > > Estimated milestones > DevTrial on desktop 98 > DevTrial on android 98 > > Link to entry on the Chrome Platform Status > https://chromestatus.com/feature/5737414355058688 > > Links to previous Intent discussionsIntent to prototype: > https://groups.google.com/a/chromium.org/g/blink-dev/c/PrB0xnNxaHs/m/jeoxvNjXCAAJ > > > This intent message was generated by Chrome Platform Status > <https://www.chromestatus.com/>. > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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