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Date:      Fri, 5 Dec 1997 08:44:51 -0700
From:      Nate Williams <nate@mt.sri.com>
To:        Bradley Dunn <bradley@dunn.org>
Cc:        Gaetan Feige <Gaetan@vsg.mobistar.be>, freebsd-isp@FreeBSD.ORG
Subject:   Re: User security
Message-ID:  <199712051544.IAA01108@mt.sri.com>
In-Reply-To: <Pine.BSF.3.96.971205091912.10211A-100000@ns3.harborcom.net>
References:  <3.0.32.19971205083748.00ae0640@vsg.mobistar.be> <Pine.BSF.3.96.971205091912.10211A-100000@ns3.harborcom.net>

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> Seriously, black box mail servers that only allow access via IMAP or POP
> are the way to go if you can. You can use SSH for remote administration,
> and with SSH's "AllowUsers" configuration option you can specify exactly
> who can connect via SSH.

There's one possible problem with SSH in that it allows remote users to
'forward' ports from the black-box machine to other machines unless you
explicitly compile out the code.  This is rather nasty if you allow
people inside your firewall to the black-box machine, since they can
forward out to other internal (unprotected) machines in your domain and
wreak havoc.  (No, this didn't happen, but it could have. :)


Nate



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