[v13] Stop users from deleting their last passwordless device #35856
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Branched from #35855, same remarks. |
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Backport #35794 to branch/v13.
Stop users from deleting their last passwordless device in a passwordless-capable cluster.
In certain situations, like clusters with "second_factor:optional", it's possible to delete all your MFA devices. A pure passwordless user could lock themselves out by doing so.
This PR makes it impossible to delete your last passwordless device (if the cluster allows passwordless logins), preventing those lockouts at the cost of being more restrictive for "normal" users.
#32690
Changelog: Stop users from deleting their last passwordless device