[Dovecot] logging IMAP username rather than UNIX username

[Timo Sirainen]

On Wed, 2008-10-22 at 12:00 +0200, Dale Gallagher wrote:
> Hi there
> 
> I'd like to change my setup to log the _actual_ IMAP user's login,
> rather than the UNIX username. My system uses a virtual uid setup with
> qmail, where the mailboxes are owned by the 'vmail' user and
> authentication is via checkpassword using user%domain (ie email, just
> with % instead of @). So dovecot is recording _all_ logins as:
> 
>     imap-login: Login: user=<vmail>, method=PLAIN, rip=127.0.0.1,
> lip=127.0.0.1, secured

That means your authentication changes the username.

>   passdb checkpassword {
>     args = /var/qmail/bin/qmail-vauth
>   }

Most likely qmail-vauth changes USER environment to vmail. If you can't
edit qmail-vauth directly, create a wrapper script that unsets the USER
environment before calling Dovecot's checkpassword-reply.

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