linux-kernel - Re: [RFC PATCH 0/2] Create CAAM HW key in linux keyring and use in dmcrypt

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Message-ID: <1551890866.5086.125.camel@pengutronix.de>
Date:   Wed, 06 Mar 2019 17:47:46 +0100
From:   Jan Lübbe <jlu@...gutronix.de>
To:     Franck LENORMAND <franck.lenormand@....com>,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Cc:     horia.geanta@....com, silvano.dininno@....com, agk@...hat.com,
        snitzer@...hat.com, dm-devel@...hat.com, dhowells@...hat.com,
        jmorris@...ei.org, serge@...lyn.com,
        David Gstir <david@...ma-star.at>
Subject: Re: [RFC PATCH 0/2] Create CAAM HW key in linux keyring and use in
 dmcrypt

Hi Franck,

thanks for working on this!

On Fri, 2019-03-01 at 17:09 +0100, Franck LENORMAND wrote:
> The creation of such structures and its use was not exposed to userspace so
> it was complicated to use and required custom development. We would like to
> ease this using interface which are known and used:
>  - Linux key retention service : Allow to generate or load keys in a
>         keyring which can be used by applications.
>  - dm-crypt : device mapper allowing to encrypt data.
> 
> The capacity to generate or load keys already available in the Linux key
> retention service does not allows to exploit CAAM capabilities hence we
> need to create a new key_type. The new key type "caam_tk" allows to:
>  - Create a black key from random
>  - Create a black key from a red key
>  - Load a black blob to retrieve the black key

On 2018-07-23, Udit Agarwal <udit.agarwal@....com> sent a series which
seems related to this:
[PATCH v2 1/2] security/keys/secure_key: Adds the secure key support
based on CAAM.
[PATCH v2 2/2] encrypted_keys: Adds support for secure key-type as
master key.

Is this series intended to continue that work and cover the same uses-
cases? 

If I remember correctly, the CAAM also supports marking blobs to allow
or disallow exporting the encapsulated key from the hardware. Or is
this unneeded and we could encrypt/decrypt other (less critical) key
material against the tk(cbc(aes)) CAAM key via the keyring mechanisms?

Best regards,
Jan
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