netdev - Re: [PATCH net-2.6.25] Add packet filtering based on process's security context.

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Message-ID: <634344.24836.qm@web36604.mail.mud.yahoo.com>
Date:	Tue, 22 Jan 2008 08:49:47 -0800 (PST)
From:	Casey Schaufler <casey@...aufler-ca.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	netdev@...r.kernel.org, davem@...emloft.net
Cc:	linux-security-module@...r.kernel.org,
	netfilter-devel@...ts.netfilter.org
Subject: Re: [PATCH net-2.6.25] Add packet filtering based on process's security context.


--- Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> wrote:

> ...
> 
> Currently, there is no way to directly map security context from incoming
> packet to user process. This is because the creator or owner of a socket is
> not always the receiver of an incoming packet. The userland process who
> receives the incoming packet is not known until a process calls
> sys_recvmsg().
> So, I want to add a LSM hook to give a security module a chance to control
> after the recipient of the incoming packet is known.

Do you have a real situation where two user processes with different
security contexts share a socket? How do you get into that situation,
and is it appropriate to have that situation in your security scheme?
Can this occur without using privilege?


Casey Schaufler
casey@...aufler-ca.com
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