On 05.12.2017 08:05, Mark Foley wrote:

I am using Active directory authentication via gssapi for most users. In dovecot.conf I have:

auth_mechanisms = plain login gssapi auth_use_winbind = yes

I also have

passdb { driver = shadow } userdb { driver = passwd }

for those few users who are NOT AD users.

Even though the AD users do not exist in /etc/passwd or /etc/shadow, Dovecot ALWAYS first looks them up in shadow, which ALWAYS fails.

The https://wiki2.dovecot.org/PasswordDatabase wiki says, "these databases can't be used with non-plaintext authentication mechanisms."

Is there a way to bypass checking passdb (and userdb?) for these mechanism?

--Mark

You can try:

passdb { ...

skip = authenticated }

In very recent dovecot version you could use mechanism_filter too, but I guess skip=authenticated should work.

Aki