[Dovecot] dovecot + LDAP + SASL?

Hi,

I would like to setup an IMAP server with SASL and LDAP support.

As far as I can see dovecot supports SASL and LDAP, but not the way I need it.

If I understand dovecot correctly, it has it's own set of SASL mechnisms and uses the LDAP server just to store the plaintext password. In case of authentication dovecot fetches the plaintext password from LDAP and then performs the SASL steps internally.

I need to support proprietary SASL mechanisms built into an LDAP server, which are not based on just a single password.

So is there a way to configure dovecot to just pass SASL through to LDAP, allowing the IMAP client to talk SASL with the LDAP server through dovecot?

regards Hadmut