#30250: Due to iOS Safari 12 issue, SameSite flag on session and CSRF cookies
should NOT be Lax by default
-------------------------------------+-------------------------------------
Reporter: Flávio | Owner: nobody
Juvenal |
Type: Bug | Status: new
Component: | Version: 2.1
Uncategorized | Keywords:
Severity: Normal | samesite,csrf,session,cookies
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
-------------------------------------+-------------------------------------
There's a [https://bugs.webkit.org/show_bug.cgi?id=188165 iOS Safari 12
issue] that prevents common flows (sequences of requests) to work properly
if there's `SameSite=lax` on cookies. This issue was
[https://bugs.webkit.org/show_bug.cgi?id=188165#c27 confirmed by Daniel
Bates, from Apple] and it's still open.
Examples of broken flows:
- OpenIdConnect: https://community.auth0.com/t/authentication-broken-on-
asp-net-core-and-safari-on-ios-12-mojave-take-2/19104
- Shopify app OAuth flow: https://www.calazan.com/django-21-samesite-
cookie-issue-with-safari-12/
- Clicking a link on an email:
https://bugs.webkit.org/show_bug.cgi?id=188165#c40
- SAML flow: https://github.com/IronCountySchoolDistrict/django-
python3-saml/issues/1
Since Safari 12 is the current stable version and it's widely deployed on
iOS devices, I believe the Django default for `CSRF_COOKIE_SAMESITE` and
`SESSION_COOKIE_SAMESITE` should be `None`, not `Lax`.
Core developers, could you please let me know if you agree with that
change, so I can make a PR updating the defaults and the documentation?
I think both CSRF and Session cookies shouldn't have the SameSite flag
because I've found many 403 Forbidden issues on both on Safari 12. If more
steps to reproduce beyond the links above are necessary, please let me
know.
--
Ticket URL: <https://code.djangoproject.com/ticket/30250>
Django <https://code.djangoproject.com/>
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