Date: Tue, 16 Jul 2002 23:46:47 -0700 From: "Crist J. Clark" <crist.clark@attbi.com> To: Luigi Rizzo <rizzo@icir.org> Cc: ipfw@FreeBSD.ORG Subject: Re: Ouch! ipfw log and DoS Message-ID: <20020717064647.GC22967@blossom.cjclark.org> In-Reply-To: <20020716124059.A2635@iguana.icir.org> References: <20020716124059.A2635@iguana.icir.org>
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On Tue, Jul 16, 2002 at 12:40:59PM -0700, Luigi Rizzo wrote:
> it just occurred to me that if you have
>
> ipfw add accept log <match pattern>
>
> and you log to a remote host and your syslog messages match your
> pattern, then you have created a loop.
> There are endless variations of the above.
>
> Bottom line is that (i believe) log messages generated by ipfw should
> be rate-limited to some not-too-large value (maybe controlled by
> a sysctl variable).
>
> Any objections if i implement that (which probably amounts to
> the following lines of code at the beginnning of ipfw_log():
>
> ----------------
> static last_log, log_left;
>
> if (last_log != time_second) {
> last_log = time_second;
> log_left = ipfw_log_rate;
> }
> if (log_left == 0)
> return;
> log_left--;
> ----------------
Errr... Isn't this syslogd(8)'s job?
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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