linux-kernel - Re: [PATCH 2/2] ima: Support appraise_type=imasig

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Date:	Wed, 13 Feb 2013 17:27:01 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ima: Support appraise_type=imasig_optional

On Wed, 2013-02-13 at 10:30 -0500, Vivek Goyal wrote:
> On Wed, Feb 13, 2013 at 05:26:27PM +0200, Kasatkin, Dmitry wrote:
> > On Wed, Feb 13, 2013 at 4:38 PM, Vivek Goyal <vgoyal@...hat.com> wrote:
> > > On Wed, Feb 13, 2013 at 03:36:45PM +0200, Kasatkin, Dmitry wrote:
> > >> It should not be the only line in the policy.
> > >> Can you share full policy?
> > >
> > > I verified by putting some printk. There is only single rule in
> > > ima_policy_rules list after I have updated the rules through "policy"
> > > file.
> > >
> > > echo "appraise fowner=0 func=BPRM_CHECK appraise_type=imasig_optional" >
> > > /sys/kernel/security/policy
> > 
> > There is a default policy which has several rules.
> > 
> > And when you do your "echo" you will replace all rules with that single rule.
> > But ok, you have one rule only and it is fine to have even a single rule...
> 
> Yep, I got that. Default policy gets overruled when a new policy is
> loaded.
> 
> In secureboot mode, somehow above rule needs to take effect by default.
> One option would be that kernel can enforce above rule.
> (I guess by adding it to both default_list as well as policy list).

The default policy is empty, but can be replaced with boot command line
options.  The existing options are ima_tcb and/ ima_appraise_tcb.
Please feel free to define an additional policy.

thanks,

Mimi

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