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From: Ken Goldman <kgold@linux.ibm.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>,
	linux-integrity@vger.kernel.org
Subject: Re: [PATCH 6/8] security: keys: trusted: add PCR policy to TPM2 keys
Date: Wed, 25 Dec 2019 12:08:47 -0500
Message-ID: <f3e2e163-1754-1360-1454-70391aed8b95@linux.ibm.com> (raw)
In-Reply-To: <1575918695.31378.18.camel@HansenPartnership.com>

On 12/9/2019 2:11 PM, James Bottomley wrote:
> Plus, I know of no policy statement that's anywhere near 127 bytes
> long, so there's no problem with doing the single byte fixed length
> that DER requires.

Is "a policy statement" the TPM command?

PolicyOr takes a list of hashes.  A typical policy may only have 3
sha256 hashes, but it could potentially be 8 sha384 hashes.

PolicySigned has a policy with a 256 byte public key and a TPM
command with a 256 byte signature.

In general, since the TPM input command buffer is 1 - 1.5k,
that's a reasonable value for input parameters.


  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-08  5:06 [PATCH 0/8] Fix TPM 2.0 trusted keys James Bottomley
2019-12-08  5:07 ` [PATCH 1/8] security: keys: trusted: flush the key handle after use James Bottomley
2019-12-09  8:31   ` David Woodhouse
2019-12-09 15:38     ` James Bottomley
2019-12-08  5:08 ` [PATCH 2/8] lib: add asn.1 encoder James Bottomley
2019-12-09  8:50   ` David Woodhouse
2019-12-09 15:46     ` James Bottomley
2019-12-09 22:05   ` Matthew Garrett
2019-12-09 22:43     ` James Bottomley
2019-12-08  5:09 ` [PATCH 3/8] oid_registry: Add TCG defined OIDS for TPM keys James Bottomley
2019-12-09  8:55   ` David Woodhouse
2019-12-09 16:21     ` James Bottomley
2020-06-19 20:45     ` Wiseman, Monty (GE Research, US)
2020-06-19 22:50       ` Jerry Snitselaar
2020-06-20 15:36       ` James Bottomley
2020-06-23  1:17       ` Jarkko Sakkinen
2019-12-08  5:10 ` [PATCH 4/8] security: keys: trusted: use ASN.1 tpm2 key format for the blobs James Bottomley
2019-12-09 10:04   ` David Woodhouse
2019-12-09 16:31     ` James Bottomley
2019-12-08  5:11 ` [PATCH 5/8] security: keys: trusted: Make sealed key properly interoperable James Bottomley
2019-12-09 10:09   ` David Woodhouse
2019-12-09 17:23     ` James Bottomley
2019-12-08  5:12 ` [PATCH 6/8] security: keys: trusted: add PCR policy to TPM2 keys James Bottomley
2019-12-09 10:18   ` David Woodhouse
2019-12-09 18:03     ` James Bottomley
2019-12-09 18:44       ` David Woodhouse
2019-12-09 19:11         ` James Bottomley
2019-12-25 17:08           ` Ken Goldman [this message]
2019-12-08  5:13 ` [PATCH 7/8] security: keys: trusted: add ability to specify arbitrary policy James Bottomley
2019-12-08  5:14 ` [PATCH 8/8] security: keys: trusted: implement counter/timer policy James Bottomley
2019-12-09 20:20 ` [PATCH 0/8] Fix TPM 2.0 trusted keys Jarkko Sakkinen
2019-12-09 20:57   ` James Bottomley

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