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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Tim Harvey <tharvey@gateworks.com>
Cc: "David Gstir" <david@sigma-star.at>,
	"Aymen Sghaier" <aymen.sghaier@nxp.com>,
	"Mimi Zohar" <zohar@linux.ibm.com>,
	"Jan Luebbe" <j.luebbe@pengutronix.de>,
	keyrings@vger.kernel.org,
	"Steffen Trumtrar" <s.trumtrar@pengutronix.de>,
	linux-security-module@vger.kernel.org,
	"Udit Agarwal" <udit.agarwal@nxp.com>,
	"Herbert Xu" <herbert@gondor.apana.org.au>,
	"Horia Geantă" <horia.geanta@nxp.com>,
	"Richard Weinberger" <richard@nod.at>,
	"James Morris" <jmorris@namei.org>,
	"Eric Biggers" <ebiggers@kernel.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	"Sumit Garg" <sumit.garg@linaro.org>,
	"James Bottomley" <jejb@linux.ibm.com>,
	"Franck LENORMAND" <franck.lenormand@nxp.com>,
	"David Howells" <dhowells@redhat.com>,
	"open list" <linux-kernel@vger.kernel.org>,
	"Jarkko Sakkinen" <jarkko@kernel.org>,
	linux-crypto@vger.kernel.org,
	"Sascha Hauer" <kernel@pengutronix.de>,
	linux-integrity@vger.kernel.org,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 0/4] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys
Date: Fri, 20 Aug 2021 22:36:30 +0200	[thread overview]
Message-ID: <9200d46d-94a2-befd-e9b0-93036e56eb8a@pengutronix.de> (raw)
In-Reply-To: <CAJ+vNU225mgHHg00r67f1L6bEub+_h55hCBAMhCq2rd8kWU-qg@mail.gmail.com>

On 20.08.21 22:20, Tim Harvey wrote:
> On Fri, Aug 20, 2021 at 9:20 AM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
>> On 20.08.21 17:39, Tim Harvey wrote:
>>> Thanks for your work!
>>>
>>> I've been asked to integrate the capability of using CAAM to
>>> blob/deblob data to an older 5.4 kernel such as NXP's downstream
>>> vendor kernel does [1] and I'm trying to understand how your series
>>> works. I'm not at all familiar with the Linux Key Management API's or
>>> trusted keys. Can you provide an example of how this can be used for
>>> such a thing?
>>
>> Here's an example with dm-crypt:
>>
>>   https://lore.kernel.org/linux-integrity/5d44e50e-4309-830b-79f6-f5d888b1ef69@pengutronix.de/
>>
>> dm-crypt is a bit special at the moment, because it has direct support for
>> trusted keys. For interfacing with other parts of the kernel like ecryptfs
>> or EVM, you have to create encrypted keys rooted to the trusted keys and use
>> those. The kernel documentation has an example:
>>
>>   https://www.kernel.org/doc/html/v5.13/security/keys/trusted-encrypted.html
>>
>> If you backport this series, you can include the typo fix spotted by David.
>>
>> I'll send out a revised series, but given that a regression fix I want to
>> rebase on hasn't been picked up for 3 weeks now, I am not in a hurry.
>>
> Thanks for the reference.
> 
> I'm still trying to understand the keyctl integration with caam. For
> the 'data' param to keyctl you are using tings like 'new <len>' and
> 'load <data>'. Where are these 'commands' identified?

Search for match_table_t in security/keys/trusted-keys/trusted_core.c

> I may still be missing something. I'm using 4.14-rc6 with your series
> and seeing the following:

That's an odd version to backport stuff to..

> # cat /proc/cmdline
> trusted.source=caam
> # keyctl add trusted mykey 'new 32' @s)# create new trusted key named
> 'mykey' of 32 bytes in the session keyring
> 480104283
> # keyctl print 480104283 # dump the key
> keyctl_read_alloc: Unknown error 126
> ^^^ not clear what this is

Not sure what returns -ENOKEY for you. I haven't been using trusted
keys on v4.14, but you can try tracing the keyctl syscall.

Cheers,
Ahmad

> 
> Best regards,
> 
> Tim
> 


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  reply	other threads:[~2021-08-20 20:36 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 16:48 Ahmad Fatoum
2021-07-21 16:48 ` [PATCH 1/4] KEYS: trusted: allow users to use kernel RNG for key material Ahmad Fatoum
2021-07-22  6:17   ` Sumit Garg
2021-07-21 16:48 ` [PATCH 2/4] KEYS: trusted: allow trust sources " Ahmad Fatoum
2021-07-22  6:31   ` Sumit Garg
2021-08-09  7:52     ` Ahmad Fatoum
2021-08-09  9:56       ` Jarkko Sakkinen
2021-08-10  5:24         ` Sumit Garg
2021-07-21 16:48 ` [PATCH 3/4] crypto: caam - add in-kernel interface for blob generator Ahmad Fatoum
2021-08-10 11:29   ` David Gstir
2021-08-11 10:22     ` Ahmad Fatoum
2021-08-11 10:43       ` David Gstir
2021-07-21 16:48 ` [PATCH 4/4] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys Ahmad Fatoum
2021-08-06 15:12 ` [PATCH 0/4] " Ahmad Fatoum
2021-08-09  9:35   ` Jarkko Sakkinen
2021-08-09 10:16     ` Ahmad Fatoum
2021-08-10 11:28       ` David Gstir
2021-08-20 16:25         ` Ahmad Fatoum
2021-08-20 15:39 ` Tim Harvey
2021-08-20 16:19   ` Ahmad Fatoum
2021-08-20 20:20     ` Tim Harvey
2021-08-20 20:36       ` Ahmad Fatoum [this message]
2021-08-20 21:19         ` Tim Harvey
2021-08-23 13:29           ` Ahmad Fatoum
2021-08-23 17:50             ` Tim Harvey
2021-08-24  7:33               ` Ahmad Fatoum
2021-08-24 15:23                 ` Tim Harvey
2021-08-25  9:34                   ` Ahmad Fatoum

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