linux-kernel - Re: [PATCH RFC] tpm: seal with a policy

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Date:	Mon, 2 Nov 2015 19:44:08 +0200
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
	chris.j.arges@...onical.com, seth.forshee@...onical.com,
	colin.king@...onical.com, josh@...htriplett.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	David Safford <safford@...ibm.com>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH RFC] tpm: seal with a policy

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

/Jarkko
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