[Dovecot] Locking down master user to certain domains through passwd-file auth

[Timo Sirainen]

On 22.11.2013, at 0.24, Andrew Obertas <andrew at infinet.net> wrote:

> Hello,
> 
> I know it is possible to lock down a master user to only have access to certain domains through SQL login but I was wondering if the same was possible with a passwd-based system. I currently have a master-passwd file residing in the /etc/virtual/domain.com/ directories I want the master user to be able to log in to. Is there a way to tell passdb to only allow the master user login to proceed if they can auth to the master-passwd file in the same folder as the user? Alternatively, is there a better way to go about this?
> 
> What I assumed would be the easy approach, where the domain from the user's e-mail is fetched, doesn't seem to work as %d fetches the master user's domain and, unless I'm doing something wrong, the login_domain variable cannot be used as this is outside Dovecot-auth.

What do you mean outside Dovecot-auth? Master user login is done in auth process. %{login_domain} should work I think..