linux-kernel - Re: [PATCH 0/2] crypto: disallow non-approved algs in fips mode

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Date:	Thu, 7 May 2009 15:27:16 -0400
From:	Jarod Wilson <jarod@...hat.com>
To:	linux-crypto@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH 0/2] crypto: disallow non-approved algs in fips mode

On Thursday 07 May 2009 14:41:26 Jarod Wilson wrote:
> At present, nothing is preventing the use of non-approved algorithms
> in fips mode. I was initially working on a patch to make it easier
> for all fips-approved algs to be tested using tcrypt, and realized
> the changes I was making could also be used to prevent non-approved
> algs in fips mode. Any approved alg *must* have self-tests, and thus
> have an entry in testmgr.c's alg_test_descs[]. By adding a fips flag
> to these entries, we can simply reject all algs that don't have this
> flag when in fips mode by skipping their self-tests and returning
> an -EINVAL to prevent them from being loaded. So with this change, I
> can
> 
> 1) 'modprobe tcrypt' and have all fips approved algs self-tested, and
>    *only* fips approved algs tested
> 
> 2) 'modprobe md4' for example, and in fips mode, have the module load
>    rejected as invalid

Hrm. Minor correction... Only seeing module loads rejected as invalid
when patching this into a Red Hat Enterprise Linux 5.x kernel. With the
cryptodev tree, we do skip non-allowed algs as intended, but loading
modules for non-allowed algs still works...

-- 
Jarod Wilson
jarod@...hat.com
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