linux-kernel - Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings instead of .ima

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Date:	Tue, 8 Mar 2016 16:14:29 +0200
From:	Petko Manolov <petkan@...-labs.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 12/12] IMA: Use the the system trusted keyrings
 instead of .ima_mok [ver #2]

On 16-03-08 13:08:36, David Howells wrote:
> Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
> 
> > Only certificates signed by a key on the system keyring were added to
> > the IMA keyring, unless IMA_MOK_KEYRING was configured.  Then, the
> > certificate could be signed by a either a key on the system or ima_mok
> > keyrings.  To replicate this behavior, the default behavior should be to
> > only permit certificates signed by a key on the builtin keyring, unless
> > this new Kconfig is enabled.  Only then, permit certificates signed by a
> > key on either the builtin or secondary keyrings to be added to the IMA
> > keyring.
> 
> How about I change it to a choice-type item, with the following options:
> 
>  (1) No addition.
> 
>  (2) Addition restricted by built-in keyring.
> 
>  (3) Addition restricted by secondary keyring + built-in keyring.
> 
> where the second and third options then depend on the appropriate keyrings 
> being enabled.

I would suggest leaving (1) and (3).  Since secondary keyring only accepts keys 
signed by certificate in the system keyring I think (2) is redundant.  It adds 
extra complexity (Kconfig is vague enough already) while it doesn't increase the 
overall security by much.


cheers,
Petko