netdev - Re: [PATCH 1/2] Define security_sk

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Date:	Wed, 31 Aug 2011 14:46:01 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	Casey Schaufler <casey@...aufler-ca.com>
Cc:	rongqing.li@...driver.com, netdev@...r.kernel.org,
	selinux@...ho.nsa.gov, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/2] Define security_sk_getsecctx

On Wed, 2011-08-31 at 08:43 -0700, Casey Schaufler wrote:
> On 8/31/2011 1:36 AM, rongqing.li@...driver.com wrote:
> > From: Roy.Li <rongqing.li@...driver.com>
> >
> > Define security_sk_getsecctx to return the security
> > context of a sock.
> 
> So, what is the intended use of the information
> coming from this hook? If I wanted to write the
> Smack hook, which of the "contexts" would I want
> to return? There are potentially three. If I know
> what the caller is looking for, I can (hopefully)
> select the correct information.

The initial use case is for netstat -Z so that it can reliably show the
security context of the socket rather than inferring it from the owning
process, which can be inaccurate for security-aware applications.

In your situation, when in != out, which would you rather see in netstat
-Z output?  Alternatively, if you want them both, perhaps you could
combine in and out into a single string that is returned, similar to
what you proposed for handling multiple xattrs with inode_getsecctx()?

-- 
Stephen Smalley
National Security Agency

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