Re: [PATCH RFC] tpm: seal with a policy

From: Jarkko Sakkinen
Date: Mon Nov 02 2015 - 12:44:23 EST

On Mon, Nov 02, 2015 at 07:48:42AM -0500, Mimi Zohar wrote:
> On Sat, 2015-10-31 at 17:53 +0200, Jarkko Sakkinen wrote:
> > Support for sealing with a policy.
> >
> > Two new options for trusted keys:
> >
> > * 'policydigest=': provide a policydigest for the seal operation.
> > * 'policyhandle=': provide handle for a policy session for unsealing.
> Please expand the patch description explaining the motivation for these
> new options. In what cases are they needed? Are they system or session
> policies?

They are session policies. By using TPM2 commands you can specify
conditions in which unseal should work like auth value, PCRs, localities
and so forth and combine these with logical connectors.

I'll think about this and write proper documentation.

> Mimi

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