From owner-freebsd-questions@FreeBSD.ORG Thu Oct 14 16:37:16 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A4DE81065674 for ; Thu, 14 Oct 2010 16:37:16 +0000 (UTC) (envelope-from matt@webcontracts.co.uk) Received: from batfink.vm.bytemark.co.uk (batfink.vm.bytemark.co.uk [80.68.95.231]) by mx1.freebsd.org (Postfix) with ESMTP id 69B268FC19 for ; Thu, 14 Oct 2010 16:37:16 +0000 (UTC) Received: from www.webcontracts.co.uk (localhost [127.0.0.1]) by batfink.vm.bytemark.co.uk (Postfix) with ESMTP id 3669E64027 for ; Thu, 14 Oct 2010 17:20:24 +0100 (BST) Received: from 212.159.19.37 (SquirrelMail authenticated user mlaw) by www.webcontracts.co.uk with HTTP; Thu, 14 Oct 2010 17:20:24 +0100 Message-ID: Date: Thu, 14 Oct 2010 17:20:24 +0100 From: "Matthew Law" To: freebsd-questions@freebsd.org User-Agent: SquirrelMail/1.4.19 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Subject: Jail question X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: matt@webcontracts.co.uk List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Oct 2010 16:37:16 -0000 I have a single box on which I would like to run openvpn, smtp (postfix, dspam, greylist, clamav), imap (dovecot) apache22 and bind. This box also acts as a network gateway so it would give an attacker carte blanche to the internal nets if it was compromised, which makes me nervous. The plan is to run openvpn as the only unjailed service and the rest of the services in a single jail or their own jails. I have never touched jails before and I'm a bit unsure of the best way to go. I realise that I can jail a service or a copy of the whole system (service would be preferable for space efficiency) but I am unclear on how to deal with IP addresses in jailed environments and if I should create individual jails or a single jail for all services. At the moment I am leaning toward a single system jail for everything so I can keep the space in which openvpn runs as uncluttered as possible and also have a single postgres instance shared by the other services. Basically, if any of the public services in the jail are compromised I would like to make it very hard for the attacker to see the internal network. If I use this scheme must I use separate public IPs for openvpn and the services jail or is it possible to use a single IP or some NAT/PAT scheme? -this box currently has 4 x NICs split into 2x lagg interfaces in failover mode (one public, one private), if that makes any difference.... Sorry for the rambling question and I hope this makes sense! Matt.