On 22 Sep 2017, at 13:47, Michael Fox wrote:
Sorry if this has been asked/answered before. I've searched and
searched and found no consistent, complete answers.
What are the steps to configure MIMEDefang and Postix to share a
socket?
The workable solutions depend on your OS (and with Linux, your
distribution,) your filesystem, and whether you chroot the Postfix smtpd
program.
Here's what I tried:
Option 1: Use inet socket
------------------------------------------------
/etc/default/mimedefang:
SOCKET=inet:8899@localhost
/etc/postfix/main.cf
smtpd_milters = inet:localhost:8899
This works for Ubuntu 14.04/MIMEDefang 2.73.
But it fails with Ubuntu 16.04/MIMEDefang 2.78. If Postfix is already
running, and MIMEDefang is restarted, I get the following in
/var/log/mail.err:
mimedefang[27605]: MIMEDefang-2.78: Unable to bind to port
inet:8899@localhost: Address already in use
mimedefang[27605]: MIMEDefang-2.78: Unable to create listening
socket on conn inet:8899@localhost
That's odd. Given your other options, I'd try to figure out what exactly
is going on here and fix it. I.e. what process actually has taken that
port.
As for using a unix socket, you don't need to create the socket inside
the chroot if it's on the same filesystem as /var/spool/MIMEDefang/ ,
you can just hardlink the existing socket.
Also, you may not need to add the postfix user to the defang group, if
you have a filesystem that supports BSD default group semantics for
setgid directories, e.g.:
chgrp postfix /var/spool/MIMEDefang/
chmod g+ws /var/spool/MIMEDefang/
With the setgid bit set on a directory, newly created files (or sockets)
take their group from the parent directory rather than the creating
process.
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