linux-kernel - Re: [PATCH v2] Instantiate key with user-provided decrypted data.

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Message-ID: <CAKoutNvhYYiKgCLFFqzczuT444TraMhmEhzFwC7u42ALTdSqaQ@mail.gmail.com>
Date:   Wed, 22 Dec 2021 11:31:51 -0500
From:   Yael Tiomkin <yaelt@...gle.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, jejb@...ux.ibm.com,
        Jarkko Sakkinen <jarkko@...nel.org>, corbet@....net,
        dhowells@...hat.com, jmorris@...ei.org, serge@...lyn.com,
        keyrings@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v2] Instantiate key with user-provided decrypted data.

On Tue, Dec 14, 2021 at 7:37 AM Mimi Zohar <zohar@...ux.ibm.com> wrote:
>
> Hi Yael,
>
> On Mon, 2021-12-13 at 14:20 -0500, Yael Tiomkin wrote:
> > The encrypted.c class supports instantiation of encrypted keys with
> > either an already-encrypted key material, or by generating new key
> > material based on random numbers. To support encryption of
> > user-provided decrypted data, this patch defines a new datablob
> > format: [<format>] <master-key name> <decrypted data length>
> > <decrypted data>.
> >
> > Signed-off-by: Yael Tiomkin <yaelt@...gle.com>
>
> Other than the comment below,
>     Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
>
> Could you also provide an LTP test for defining, exporting, and loading
> an encrypted key based on user provided key data?
>
> thanks,
>
> Mimi
>
> > ---
>
> > @@ -303,6 +306,16 @@ Load an encrypted key "evm" from saved blob::
> >      82dbbc55be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e0
> >      24717c64 5972dcb82ab2dde83376d82b2e3c09ffc
> >
> > +Instantiate an encrypted key "evm" using user-provided decrypted data::
> > +
> > +    $ keyctl add encrypted evm "new default user:kmk 32 `cat evm.blob`" @u
> > +    794890253
>
> The existing references to "evm.blob" refer to the encrypted key data.
> Here "evm.blob" is unencrypted data.  Perhaps name it something like
> "evm.user-provided-data" data.
>
> > +
> > +    $ keyctl print 794890253
> > +    default user:kmk 32 2375725ad57798846a9bbd240de8906f006e66c03af53b1b382d
> > +    bbc55be2a44616e4959430436dc4f2a7a9659aa60bb4652aeb2120f149ed197c564e0247
> > +    17c64 5972dcb82ab2dde83376d82b2e3c09ffc
> > +
>

Hi Mimi,

I have posted the ltp test:
https://lore.kernel.org/all/20211221023721.129689-1-yaelt@google.com/

I will update the documentation per your suggestion.

Thanks,
Yael