RE: imap and content inspection?

["Dawes, Rogan (ZA - Johannesburg)" <rdawes () deloitte co za>]

You may want to look at www.imapproxy.org. Granted it is not exactly the
same thing, but it should provide some basic protocol handling code that
could be developed further.


> -----Original Message-----
> From: ark () eltex ru [mailto:ark () eltex ru] 
> Sent: 09 October 2003 01:41 PM
> To: firewall-wizards () honor icsalabs com
> Subject: [fw-wiz] imap and content inspection?
>
>
> Hi,
>
> I am planning IMAP filtering proxy implementation. A quick 
> look into rfc
> shows the IMAP protocol appears to be designed to maximize firewall 
> application layer problems ;-). I mean it requires proxy to 
> handle full
> email mime parsing, besides quite sophisticated protocol itself, thus
> making proxy very complex pile of code, comparable with IMAP 
> server itself,
> which turns its security (through simplicity!) advantage questionable.
> And - there are numerous ways to retreive various parts of 
> messages without
> handling message as whole; if content inspection means simple 
> virus check
> with binary result (OK/BAD) it is not really a problem, but 
> if we employ other
> content inspection types, it ruins the whole idea.
>
> I know here are many people on the list who know 
> implementation details in
> depth, how do other vendors solve this problem? Is "best practice" now
> to just handle FETCH and UID FETCH commands syntax issued by 
> widespread email
> clients and not to care if other techniques are used?
>
> p.s. for those interested in "fwtk sequel", i expect 
> something like "public
> beta" to be finished before Samhain. ;-) i doubt i will 
> include "real" imap4
> proxy, though :(
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