linux-kernel - RE: [tpmdd-devel] [PATCH 2/2] keys, trusted: seal with a policy

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Message-ID: <9F48E1A823B03B4790B7E6E69430724D9D974334@EXCH2010B.sit.fraunhofer.de>
Date:	Thu, 19 Nov 2015 10:59:57 +0000
From:	"Fuchs, Andreas" <andreas.fuchs@....fraunhofer.de>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	David Howells <dhowells@...hat.com>
CC:	Jonathan Corbet <corbet@....net>,
	"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
	David Safford <safford@...ibm.com>,
	open list <linux-kernel@...r.kernel.org>,
	"moderated list:TPM DEVICE DRIVER" 
	<tpmdd-devel@...ts.sourceforge.net>,
	"open list:KEYS-ENCRYPTED" <linux-security-module@...r.kernel.org>,
	"open list:KEYS-ENCRYPTED" <keyrings@...r.kernel.org>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>
Subject: RE: [tpmdd-devel] [PATCH 2/2] keys, trusted: seal with a policy

> ________________________________________
> From: Jarkko Sakkinen [jarkko.sakkinen@...ux.intel.com]
> Sent: Tuesday, November 17, 2015 17:27
> 
> Support for sealing with a authorization policy.
> 
> Two new options for trusted keys:
> 
> * 'policydigest=': provide an auth policy digest for sealing.
> * 'policyhandle=': provide a policy session handle for unsealing.

Hi Jarkko,

just out of curiosity; when testing this, how did you calculate the blobauth parameter ?
Since its calculation requires the cpHash for the unseal()-command...
If you "predict" the cpHash in userSpace, this would mean that userspace needs to know the
kernels way of constructing the unseal()-command to the TPM, which in turn would make
this part of the ABI and require documentation before upstreaming, imho.

Cheers,
Andreas--
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