Two jail questions

Steve Kargl sgk at
Thu Oct 19 18:00:39 UTC 2017

On Thu, Oct 19, 2017 at 12:46:14PM -0500, Adam Vande More wrote:
> On Thu, Oct 19, 2017 at 12:32 PM, Steve Kargl <sgk at troutmask.apl.washington.
> edu> wrote:
> >
> > 1) If an application (e.g., sshd) needs to reach the internet from a
> >    jail, is it required to have the host system running pf (or other
> >    packet filtering software)?
> >

Thanks for the pointer.  I haven't looked at vnet/vimage yet.
All the examples I found via google suggested that packet
filtering was necessary.  The host system, on which I'm setting
up the jail, already sits behind 2 firewalls.  Adding a third
seemed to be overkill (unless required for the jail!).

> > 2) Suppose I have to classes of users on a system: normal users and
> >    guest users.  For normal users (including those that are members
> >    of the wheel group), I would like those individuals to be able
> >    to use ssh to connect to the host system.  For guest users, I
> >    want to isolate those users in a jailed environment.  Thus, I'll
> >    have sshd running in both the host and jail.  How do I setup
> >    such a scheme?
> >
> sshd in the jail needs to run on a different port if you're using the same
> ip, otherwise if you use an independent networking stack you would
> configure as normal.

So, then this comes down to 

ssh normal at a.b.c.d         <-- host system's sshd listening on default port
ssh -p 1111 guest at a.b.c.d  <-- jailed sshd listening on port 1111


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