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   Postfix Domain Based Restrictions
Bidding Time:
14/07/2008 02:56 - 21/07/2008 00:00
Budget:
$30-250
Status:
 Closed


Job Type:
Linux, System Admin., Website Security
Description:

This project is for Postfix experts only please!
PROBLEM :
We operate multiple L.A.M.P. servers on behalf of our clients and we are
encountering numerous attacks on a specific server due to an outdated PHP
application on one of our clients website. The attacker exploits the client's
"Contact Us" form and forces the M.T.A (Postfix) to send SPAM e-mail
to internet users.
SOLUTION :
Since this server is intended to send e-mail to the hosted domains only, we are
comfortable restricting e-mail delivery to a specified list of domains, which in
turn rejects any messages sent outside this domain list.
We require a solution that achieves exactly what is mentioned here, using
built-in Postfix functions or mechanisms only. With the option of applying the
same solution on other servers as well.
Please be aware that we don't require any per USER restrictions, we just need to
permit Postfix to send e-mail to the specified domains only and deny any email
going elsewhere.
EXAMPLE :
A file ALLOWED_DOMAINS contains abc123.com xyz.net 456.org , etc.
1. Postfix receives a mail command (from PHP, Telnet, or anywhere)
2. Postfix checks the RECIPIENT e-mail address against ALLOWED_DOMAINS
3. If RECIPIENT matches any of the ALLOWED_DOMAINS => SEND MESSAGE
4. If RECIPIENT does NOT match any of the ALLOWED_DOMAINS => REJECT
Thats all...
Please make sure you understood the project requirements clearly before placing
any bids to avoid wasting our time and yours too.
The solution must be WELL documented to allow our webmasters to deploy it
accordingly. For security reasons, no access to our servers will be granted
under any circumstances.
Thank you for your time and co-operation in advance.
MASH Group

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Operating System:
 Linux
Database System:
 (None)
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