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RE: cfengine, firewall and security

From: Patrice GUERLAIS
Subject: RE: cfengine, firewall and security
Date: Thu, 9 Nov 2000 15:09:29 +0100

Thanks Mark, but it doesn't really solve my problem.

What I want to do is to keep all my reference files and configuration scripts 
on a server protected behind the firewall, and then
"push" all those things from that server to the clients. The clients can be 
either protected behind the firewall themselves (and I
have no problem to achieve that), or exposed outside the firewall (here is the 
concern). The server must be very well protected,
because it maintains the configuration of _all_ my systems (clients), and can 
connect to any of them.

The problem is that I don't want somebody who breaks into an exposed client to 
be able to connect to the server protected by the
firewall. I must then close the firewall from outside towards inside, but I can 
leave it open from inside towards outside. That's
the exact contrary of your answer :-) , and your systems look rather exposed :-(
But as cfengine works on a pull rather push mode, I understand that it can't be 
done, because the actual connection is initiated by
the client, and not by the server, even if you use cfrun : as long as I 
understood it, cfrun only asks the client to connect itself
to the server and to synchronize itself. Therefore, the "request for sync" is 
sent with cfrun from the server to the client (no
firewalling problem), but the real stuff is done by the client, which connects 
itself to the server. And then generates those damned
firewalling concerns.

Am I right, or did I totally misunderstood ?

Thanks for your help

> -----Message d'origine-----
> De : address@hidden [mailto:address@hidden
> la part de Mark R. Lindsey
> Envoyé : jeudi 9 novembre 2000 13:56
> À : Patrice GUERLAIS; cfengine-help
> Objet : Re: cfengine, firewall and security
> : has anybody ever tried to use cfengine through a firewall without
> : compromising security ? I mean, keep the reference server protected
> : behind a firewall, and synchronize clients located both inside and
> : outside the firewall.
> I have one cfengine server setup with firewall filtering; the protocol
> is straightforward enough -- connections from any TCP port on the client
> are made to port 5308 TCP on the cfd server, and no TCP connections are
> made from the cfengine server back to the client.
> Just setup specific rules on the firewall to allow each external client
> to connect to 5308 TCP on the internal cfengine server.
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> Help-cfengine mailing list
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