On Mon, Aug 20, 2007 at 02:07:35AM +0200, Lennart Poettering wrote:
> This probably needs UI love, and use of D-Bus instead of Unix
> for the admin rights, but the idea is there.
Fieryfilter used the userspace QUEUE netfilter target to do its
work. That sucked big time, because if the user didn't click away his
dialogs quick enough the sender would repeat its packet which is
difficult to deal with if you don't want to accumulate dialogs for the
If someone wants to investigate the whole desktop firewall for Linux
thing a little more I think it would make more sense to write an LSM
module for that kernel that intercepts the socket calls (i.e,
accept(), listen(), connect() and friends) and relays them to
userspace for a verdict. Would be much cleaner and simpler. And would
also be a good excuse to keep LSM in the kernel. ;-)
(Hmm, that could also be integrated with PolicyKit...)
Last time I looked it was difficult to stack LSMs, hence this all is
Something that's coming soon is an option to use selinux without LSM
(paraphrasing, but it gets the idea across). The stacking ability of
LSMs never really worked, and has been removed now afaik.
With the removal of LSM, SELinux gets a performance increase, and
also removes a bunch of potential attack vectors.
So adding new functionality based on LSM would be a mistake.