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RE: How I did integrate Virus Scanner to ZMailer

We found an elegant solution for using spamassassin alone that involved running spamd, telling zmailer to run content filter which connected to the spamd port to check for spam, and then returning from the content filter. Could this be applied to MailScanner? Can it be made to listen on a port for mail?

Luke Galea 
Software Development
BlueCat Networks

-----Original Message-----
From: Mariano Absatz [mailto:zmailer@lists.com.ar] 
Sent: March 13, 2003 1:49 PM
To: zmailer@nic.funet.fi
Subject: Re: How I did integrate Virus Scanner to ZMailer

I'm taking a similar approach (actually using 2 separate postoffice's instead 
of modifying router.c, but conceptually it's the same thing).

However, I'm trying to adapt MailScanner (http://MailScanner.info) to do AV 
and antispam checking...

The problem is that MailScanner only has support for Sendmail and Exim. I'm 
looking at the code and talking to the developers and it isn't a simple thing 
to adapt it to "one-file-queue" mailers like zmailer or postfix because the 
module interfaces aren't quite clean yet... they are working towards it.

In the meantime I'm writing a quick filter to convert the zmailer router 
queue files into pseudo-sendmail-qf-and-df files so that MS processes them 
and then convert them back for zmailer's router to take over.

It is clumsy, but I expect to have something working in a week or so. I'll 
also try to see if MS can be cleaned up a bit more so as to be able to 
support zmailer directly.

MailScanner is nice because, conceptually, works a bit like zmailer does. It 
takes a bunch of messages from one queue, processes them and puts them in 
another queue.

Actually, it takes a bunch of messages, explodes their content into files, 
does a bit of internal analysis (rbl lists, typical html vulnerabilities and 
the like) and then hands them to SpamAssassin (http://spamassassin.org) and 
then runs a virus scanner thru them.

It just needs a standard virus file scanner without any special support (see 
the web page for supported scanners).

It is very configurable in the sense that you can ask it to do or not most of 
its tests and you can even pass more than one AV scanner to each attachment 
(were you paranoid enough).

What would be helpful in zmailer (either for this or other kind of stuff you 
could eventually want to do in the queue) is that either smtpserver or router 
could be configured (either thru command line or config file) to use a 
different directory than "router" for output or input respectively.

smtpserver -O xxxx
where xxxx is a directory name relative to the $POSTOFFICE for smtpserver's 
output queue
router -I xxxx 
where xxxx is a directory name relative to the $POSTOFFICE for router's input 

or both...

El 13 Mar 2003 a las 16:54, Tomasz Nowak escribió:

> Hi,
>   Especcialy for Matti.
>   1. Change source directory for router daemon in router/router.c.
>   Replace "router" with for example "clean".
>   2. Make standalone process which scans directory router, get files,
>   scan with antyvirus, if ok then put them to directory clean. If
>   virus then generate warning message to sender and recipient and
>   delete virus message.
>   2.a. How scan ? I use a little modified amavis script. My amavis
>   gets message and extracts all attachments.
>   2.b. Run antyvirus with extracted attachments.
>   This is quite simple. I wrote for this simple perl script.
>   Some of antyviruses can extract attachments internaly. In this case
>   you can omit step 2.a.
>   If you have any question I help you with pleasure.

Mariano Absatz
El Baby
It is now proved beyond doubt that smoking is one
of the leading causes of statistics.
        -- Fletcher Knebel

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