Support integrated 2FA with Postfixadmin

[svenseeberg]

We're currently working on a 2FA mechanism for Postfixadmin. It would be very useful for users, if they can use the same TOTP codes when logging in on Roundcubemail or Postfixadmin.

We already outlined a sync mechanism in the linked PR.

However, Roundcubemail does not yet support the same secrets / mechanism as Postfixadmin. For full integration, 2 things would be needed:

• Disable the setup form within the Roundcubemail user settings (because TOTP would be configured in Postfixadmin and then synced)
• Support the same mechanism so that the same secret can be used

[Neustradamus]

To follow

[svenseeberg]

The TOTP pull request for PFA (https://github.com/postfixadmin/postfixadmin/pull/753) has been merged. We would now start working on a RCM PR next. Any input on an implementation is welcome :)