External Program for Authentication?

[Christian Kivalo]

On 2018-05-16 21:18, Marc Perkel wrote:
> Is it possible to run a bash script for authentication where a 0 exit
> code indicates success and a non-zero is failure? What I'm trying to
> do is create a shadow IMAP server that authenticates against a
> different server. That way my server will use the same passwords as an
> existing server.
> 
> So what I would need is for dovecot to pass the username and password
> to my script, I attempt to log in remotely and if I succeed I allow
> access on my side. My side will be used to configure black lists and
> where spam is dragged from their side to my side. (I'm a spam
> filtering company)
Have you looked at the checkpassword [1] and imap [2] authdatbase 
descriptions in the wiki?

[1] https://wiki2.dovecot.org/AuthDatabase/CheckPassword
[2] https://wiki2.dovecot.org/PasswordDatabase/IMAP

-- 
  Christian Kivalo