lkml.org 
[lkml]   [2003]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Secure usage of netfilter hooks
From
Date
On Thu, 2003-01-30 at 17:33, Abhishek Singh wrote:
> Is it possible for a netfilter hook registered during module insertion
> time to be removed by a userspace application (such as iptables) without
> the insertion of a new module?

Yeah, remove all rules using it and rmmod the module.

> What I am trying to do is implement a hook for secure packet processing
> using netfilter. If however an attacker can remove this hook without
> inserting a new module or compromising the kernel in some way then the
> security level of this hook is compromised.

You gotta be root to manipulate iptables. If a user could manipulate ANY
iptables rules security would already be compromised because any user
could fuck with firewall rules.

HTH

--
// Gianni Tedesco (gianni at scaramanga dot co dot uk)
lynx --source www.scaramanga.co.uk/gianni-at-ecsc.asc | gpg --import
8646BE7D: 6D9F 2287 870E A2C9 8F60 3A3C 91B5 7669 8646 BE7D
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2005-03-22 13:32    [W:0.048 / U:2.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site