From mboxrd@z Thu Jan  1 00:00:00 1970
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From: David Woodhouse <dwmw2 at infradead.org>
Subject: Re: [tpm2] Conflicting TPM2 engines and storage formats
Date: Wed, 03 Oct 2018 11:47:15 +0100
Message-ID: <50805b898f328f04efecc89bbbc15e2c3999febf.camel@infradead.org>
In-Reply-To: 1538563222.7448.8.camel@HansenPartnership.com
List-ID: <tpm2@lists.01.org>
To: tpm2@lists.01.org

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On Wed, 2018-10-03 at 12:40 +0200, James Bottomley wrote:
> > --- a/src/tpm2-tss-engine-common.h
> > +++ b/src/tpm2-tss-engine-common.h
> > @@ -55,8 +55,7 @@ TSS2_RC init_tpm_key(ESYS_CONTEXT **ctx, ESYS_TR
> > *keyHandle,
> >          .objectAttributes =3D (TPMA_OBJECT_USERWITHAUTH | \
> >                               TPMA_OBJECT_RESTRICTED | \
> >                               TPMA_OBJECT_DECRYPT | \
> > -                             TPMA_OBJECT_FIXEDTPM | \
> > -                             TPMA_OBJECT_FIXEDPARENT | \
> > +                             TPMA_OBJECT_NODA | \
> =

> This is the only troubling change, the rest looks fine to me.  The
> template for a TPM created key *must* contain those two flags.  NODA is
> one of those things which should be specified on the command line
> rather than hard coded as well.  So to be exact, you need an extra
> command line flag for whether or not you want TPMA_OBJECT_NODA (some
> keys would like DA protection, especially private VPN ones, but the
> creator of the key should ultimately decide) and if you have a TPM
> create key you need TPMA_OBJECT_FIXEDTPM and TPMA_OBJECT_FIXEDPARENT
> but if you're wrapping an existing key they have to be clear.

This is for generating the primary key. It looks like your code always
sets NODA, but *not* FIXEDTPM and FIXEDPARENT.

The tpm2-tss engine does set FIXEDTPM and FIXEDPARENT, but not NODA.

As noted, the above patch comes from blindly making tpm2-tss-engine
look like your code, without even looking at what the flags mean :)

I don't see why you set NODA on the primary key which has no auth
anyway, and you seem to be saying that the lack of FIXED{TPM,PARENT} on
your side is also problematic? Does that mean we should be changing
your code to match what's in tpm2-tss-engine?

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