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CORS should only be bypassed on PublicPage if not logged in #36396

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merged 1 commit into from
Feb 17, 2023

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susnux
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@susnux susnux commented Jan 26, 2023

Summary

To prevent CSRF attack vectors CORS should only be bypassed if not logged in on @PublicPage.
If you add the CORS annotation you would expect all users to be validated even on @PublicPage, e.g. for APIs where anonymous users can submit data but also logged in users, currently there is no protection against CSRF on those API endpoints.

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@szaimen szaimen added this to the Nextcloud 26 milestone Jan 26, 2023
@szaimen szaimen requested review from a team, ArtificialOwl, icewind1991, blizzz and nickvergessen and removed request for a team January 26, 2023 20:49
@jotoeri jotoeri mentioned this pull request Jan 27, 2023
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@blizzz blizzz mentioned this pull request Feb 1, 2023
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susnux commented Feb 8, 2023

Any update on this one? Something I can help with?

@nickvergessen nickvergessen removed the request for review from LukasReschke February 8, 2023 22:10
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LGTM, but not too deep in the topic

@juliushaertl
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Restarted drone since the history was gone

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  1. Test\AppFramework\Middleware\Security\CORSMiddlewareTest::testCORSShouldNeverAllowCookieAuth
    OC\AppFramework\Middleware\Security\Exceptions\SecurityException: CORS requires basic auth

seems related :/

… in to prevent CSRF attack vectors

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>
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susnux commented Feb 16, 2023

seems related :/

The exception is expected, fixed the new test.

@juliushaertl juliushaertl merged commit 90d2cb0 into master Feb 17, 2023
@juliushaertl juliushaertl deleted the fix/cors branch February 17, 2023 08:42
@skjnldsv skjnldsv mentioned this pull request Feb 23, 2023
susnux added a commit to nextcloud/forms that referenced this pull request Mar 20, 2024
This was fixed in Nextcloud 26+, ref: nextcloud/server#36396

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
susnux added a commit to nextcloud/forms that referenced this pull request Mar 22, 2024
This was fixed in Nextcloud 26+, ref: nextcloud/server#36396

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
susnux added a commit to nextcloud/forms that referenced this pull request Mar 22, 2024
This was fixed in Nextcloud 26+, ref: nextcloud/server#36396

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
Chartman123 pushed a commit to nextcloud/forms that referenced this pull request Mar 22, 2024
This was fixed in Nextcloud 26+, ref: nextcloud/server#36396

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
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4 participants