Jail question

[Fbsd8]

Matthew Law wrote:
> 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.
> 


Check out qjail. It has been submitted for addition to the ports 
collection, but the ports dept is very slow in performing their task of 
adding new ports to the system. So in the mean time you can get qjail 
from here.  http://sourceforge.net/projects/qjail/files/