Subject: Re: security sysctl? (was: r/o filesystem restrictions for firewall?)
To: Thor Lancelot Simon <>
From: Jon Lindgren <>
List: tech-kern
Date: 10/24/2000 13:45:06
On Tue, 24 Oct 2000, Thor Lancelot Simon wrote:

> On Tue, Oct 24, 2000 at 11:05:38AM -0400, Jon Lindgren wrote:
> > I began a discussion a day or so ago on port-sparc and netbsd-help
> > regarding setting up a firewall with r/o local disks (specifically, using
> > a CD to boot, and allowing _no_ local writes to the disk).
> > 
> > After many suggestions on how to accomplish this, a suggestion was made as
> > to a theoretical securelevel 3 where not much at all can be changed (no
> > ipf rules added, etc...).
> I don't at all understand what's "theoretical" about this, or what
> enhancements would be rquired.  The policy enforced at securelevel 
> 2 was designed and implemented *specifically* for this purpose and
> AFAICT works fine.  If you don't understand how to use it to achieve your
> goal, I suggest that you really shouldn't be tinkering with the system's
> security model.

Then I definitely don't know exactly what securelevel 2 is.  Is there a
spot to read up on exactly what it does and what it affects?


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