I'm having a problem with your script... it won't create the files in
/var/db/popb4smtp/.
All I've changed is $POPLOG and $IMAPLOG to /var/log/maillog.
I've created /var/db/popb4smtp/ and root owns it.
What am I doing wrong?
On Wednesday, January 15, 2003, at 10:35 am, Sheldon Hearn wrote:
> On (2003/01/14 22:42), Aaron B. Russell wrote:
>
>> Secondly, how would I go about setting up pop-before-smtp with Exim?
>> Is
>> this even possible? The official project website makes it look as if
>> it's geared for being used with postfix...
>
> The list archives contain an enormous amount of information on this
> subject. In particular, my last post on this Subject is
>
> Message-ID: <20021024202817.GK47624@???>
>
> That message gave complete instructions for setting up a
> pop-before-smtp
> solution using a PostgreSQL database.
>
> However, I recently tried something a little unusual. With the new
> flexibility of Exim 4, I found it trivial to set up a pop-before-smtp
> solution with absolutely no database at all!
>
> It uses a directory tree, /var/db/popb4smtp, in which the existence of
> a
> file represents a valid "popped recently token" for the IP address used
> as the filename.
>
> Basically, I use a script to grab authenticated IP addresses from the
> log files of my POP3 and IMAP4 daemons. These are put in the popb4smtp
> directory tree.
>
> I use another script to periodically remove stale files from the tree.
> I consider files stale after two hours. There's a small race condition
> here; it's possible for a file to be deleted _just_ after it has been
> updated by the script that watches the logs. For low-volume servers,
> the odds of hitting this window are low.
>
> Then, I create a POPB4SMTP_CLIENT macro in the Exim configure file to
> provide a reusable "has this sender popped recently" query:
>
> POPB4SMTP_SUBDIR =
> /var/db/popb4smtp/${substr_-1_1:$sender_host_address}
> POPB4SMTP_CLIENT = ${if exists {POPB4SMTP_SUBDIR/$sender_host_address}
> \
> {$sender_host_address} {0} \
> }
>
> Now you can use it just about anywhere, including in your ACLs. Simple
> examples include:
>
> hostlist relay_hosts = 127.0.0.1/32 : ... : POPB4SMTP_CLIENT
> host_lookup = !127.0.0.1/32 : ... : !POPB4SMTP_CLIENT
> rfc1413_hosts = !127.0.0.1/32 : ... : !POPB4SMTP_CLIENT
>
> The two scripts (and a FreeBSD startup script for them) are available
> for download at:
>
> http://people.FreeBSD.org/~sheldonh/popb4smtp-nodb.tar.gz
>
> Ciao,
> Sheldon.
