Open Bug 1494431 Opened Last year Updated 9 months ago
.com to mozilla services whitelisted roots in Firefox
We are creating a lot of new products and services under *.firefox.com that do not get added to the list of preloaded hpk pins . We are currently only using Digicert certificates on *.firefox.com (to the exception of design.f.c, issued by LE, see attachment), so I propose that we put the entire *.firefox.com domain in the list of sites covered by the mozilla services whitelisted roots (which currently include Digicert and Let's Encrypt). This will reduce the risk of a fraudulent CA hijacking Firefox sites and serving malicious content, while also not depending on the somewhat-defunct hpkp. Thoughts?  https://dxr.mozilla.org/mozilla-central/source/security/manager/tools/PreloadedHPKPins.json
Summary: Ping *.firefox.com to mozilla services whitelisted roots in Firefox → Pin *.firefox.com to mozilla services whitelisted roots in Firefox
Hmmm... I assume we're good with requiring HTTPS for all of firefox.com, too? Like, we don't have any mandatory-HTTP endpoints there for updaters or some such?
detectportal.firefox.com is one HTTP site we need to keep before this can happen. jcj: does adding a site to the preloaded pins mean requiring HTTPS for that site? I assume the answer is yes based on your comment.
Here's a list of *.firefox.com domains extracted from mozilla central: 41 https://accounts.firefox.com 14 https://screenshots.firefox.com 12 http://design.firefox.com 12 http://www.firefox.com 6 https://profile.accounts.firefox.com 4 https://oauth.accounts.firefox.com 4 https://testpilot.firefox.com 3 https://api.accounts.firefox.com 3 https://marketplace.firefox.com:443 2 http://detectportal.firefox.com 1 http://hidden.firefox.com 1 http://self.firefox.com 1 https://verifier.accounts.firefox.com I don't know what "hidden" and "self" are. I suspect they are tests since the records don't exists in DNS. "design" supports and redirects to HTTPS, so no problem there.
(In reply to Julien Vehent [:ulfr] from comment #2) > detectportal.firefox.com is one HTTP site we need to keep before this can > happen. > > jcj: does adding a site to the preloaded pins mean requiring HTTPS for that > site? I assume the answer is yes based on your comment. I'll get a double-check from Dana, but I believe so: Adding a site to the key pins will make it 'true' for PublicKeyPinningService::HostHasPins, which is called by nsSiteSecurityService::IsSecureURI as part of page construction. I believe that will require HTTPS, but I'm not totally certain. (Could always just make a build and try it, I suppose). Dana?
Pinned sites aren't upgraded to https, so we shouldn't need the carveout for http://detectportal.firefox.com (as an aside, presumably we're doing a good job protecting other *.firefox.com cookies from attackers injecting code into that http-only site?) Pinned sites aren't allowed to have certificate error overrides, though (which, incidentally, means our error page is a bit misleading for pinned, non-HSTS domains, since it only mentions HSTS).
Comment on attachment 9012329 [details] certificates from *.firefox.com not issued by digicert OK, so it sounds good to me. When do you want to make this change?
Attachment #9012329 - Flags: feedback?(jjones) → feedback+
I'll submit a patch now to run it in test mode for at least one release cycle, and if telemetry is happy, we can switch it on.
Put the entire *.firefox.com domain in the list of sites covered by the mozilla services whitelisted roots, which currently include Digicert and Let's Encrypt.
Comment on attachment 9013004 [details] Bug 1494431 - Pin *.firefox.com to mozilla services whitelisted roots Dana Keeler [:keeler] (she/her) (use needinfo) has approved the revision.
Comment on attachment 9013004 [details] Bug 1494431 - Pin *.firefox.com to mozilla services whitelisted roots J.C. Jones [:jcj] (he/him) has approved the revision.
Alright, let's try this on nightly. :keeler, do you remember how we would track this in telemetry?
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/autoland/rev/351f159a3fd8 Pin *.firefox.com to mozilla services whitelisted roots r=keeler,jcj
I think we'd be looking at the CERT_PINNING_MOZ_TEST_RESULTS_BY_HOST histogram. The buckets are (2 * id) + (success ? 1 : 0) ( https://searchfox.org/mozilla-central/rev/819cd31a93fd50b7167979607371878c4d6f18e8/security/manager/ssl/PublicKeyPinningService.cpp#300 )
Dana, two questions: 1) Where can I find the compiled list of preloaded pins in a Firefox installation? 2) Would you have a link to a telemetry dashboard where we can track violations for *.firefox.com (15)?
The compiled pin list is https://searchfox.org/mozilla-central/source/security/manager/ssl/StaticHPKPins.h but it hasn't been updated by the automated script to include these changes yet (this is the most recent run: https://hg.mozilla.org/mozilla-central/rev/c69fc771bb00 ). Looks like we're running it once every 3 days or so. Here's a link to a dashboard: https://mzl.la/2zMfuke Bucket 30 will be failures and bucket 31 will be successes. Right now, we have mostly success for aus5.mozilla.org and some failures, and only successes for telemetry.mozilla.org.
Do we need to backport this to Beta and/or ESR60?
(In reply to Ryan VanderMeulen [:RyanVM] from comment #17) > Do we need to backport this to Beta and/or ESR60? We do not. It is still in test mode (not effectively blocking) and will gradually roll out to future releases.
Quoting :keeler on telemetry analysis: > on beta it looks like 1.46k failures compared to 187k successes That's a 0.8% failure rate, which is quite high. We probably need to investigate it further before turning it on.
What's odd is the failures are disproportionately from windows7 installations.
I suggest we let this ride in testing mode to release with 64, then use telemetry to decide if we want to flip it in 66.
Depends on: 1521940
Status: RESOLVED → REOPENED
Resolution: FIXED → ---
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