From owner-freebsd-ipfw  Tue Jul 27 12:52:10 1999
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From: Joe Greco <jgreco@ns.sol.net>
Message-Id: <199907271951.OAA13451@aurora.sol.net>
Subject: Re: securelevel and ipfw zero
In-Reply-To: <199907271917.NAA26828@mt.sri.com> from Nate Williams at "Jul 27, 1999  1:17: 5 pm"
To: nate@mt.sri.com (Nate Williams)
Date: Tue, 27 Jul 1999 14:51:34 -0500 (CDT)
Cc: jgreco@ns.sol.net, nate@mt.sri.com, julian@whistle.com,
	green@FreeBSD.ORG, dillon@apollo.backplane.com, hackers@FreeBSD.ORG,
	freebsd-ipfw@FreeBSD.ORG
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> > > > I like the ability at secure level 3 to only reset the counters forward..
> > > > It fits in with such things as the "append only" flag.
> > > 
> > > Then we'd have to implement per-rule counters that default to
> > > IPFW_VERBOSE_LIMIT but that could be changed to anything.  That's a very
> > > different setup than what we currently have.
> > > 
> > > (Another thing I just thought of is that this could cause DoS attacks on
> > > the system if a user compromised root and then set the limit to a very
> > > high number.)
> > 
> > This is already possible via sysctl, the VERBOSE_LIMIT variable may be
> > altered.
> 
> Can this be altered in securelevel==3?

# sysctl -a|grep secur
kern.securelevel: 3
# sysctl -a|grep verbo
net.inet.ip.fw.verbose: 1
net.inet.ip.fw.verbose_limit: 0
# sysctl -w net.inet.ip.fw.verbose_limit=999
net.inet.ip.fw.verbose_limit: 0 -> 999

"Any more questions?"  :-)

... Joe

-------------------------------------------------------------------------------
Joe Greco - Systems Administrator			      jgreco@ns.sol.net
Solaria Public Access UNIX - Milwaukee, WI			   414/342-4847


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