linux-kernel - Re: [RFC 1/1] ima: digital signature verification using asymmetric keys

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Date:	Tue, 29 Jan 2013 13:20:12 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>,
	dhowells@...hat.com, jmorris@...ei.org,
	linux-security-module@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/1] ima: digital signature verification using asymmetric
 keys

On Mon, Jan 28, 2013 at 08:48:55PM -0500, Mimi Zohar wrote:

[..]
> > Hi Mimi,
> > 
> > By policy you mean ima rules here? So I can either enable default rules
> > (tcb default rules for appraisal and measurement) by using kernel command
> > line options or dynamically configure my own rules using /sysfs interface?
> > 
> > If yes, AFAIK, existing inputtable policies do not allow this selective
> > mode where we do appraisal only on signed executable. That means I shall
> > have to extend the way policies can be specified so that one specify
> > that appraise only signed files?
> 
> We've just added the ability of defining the method for appraising a
> file and defining rules in terms of the filesystem UUID.  Extending the
> IMA policy shouldn't be a problem, but I'm not sure how you would go
> about adding support for only appraising files with digital signatures.

Hi Mimi,

Can we add another field to ima_rule_entry, say .enforcement to control
the behavior of .action. Possible values of .enforcement could be, say.

ALL
SIGNED_ONLY

ALL will be default. And with .action= MEASURE, one could possibly use
.enforcement=SIGNED_ONLY.

Thanks
Vivek
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