linux-kernel - RE: One question about trusted key of keyring in Linux kernel.

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Message-ID: <A888B25CD99C1141B7C254171A953E8E4909E8B8@shsmsx102.ccr.corp.intel.com>
Date:   Wed, 4 Dec 2019 06:39:50 +0000
From:   "Zhao, Shirley" <shirley.zhao@...el.com>
To:     James Bottomley <jejb@...ux.ibm.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>
CC:     "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "'Mauro Carvalho Chehab'" <mchehab+samsung@...nel.org>,
        "Zhu, Bing" <bing.zhu@...el.com>,
        "Chen, Luhai" <luhai.chen@...el.com>
Subject: RE: One question about trusted key of keyring in Linux kernel.

Oh, get you, James. 
Understand, thanks for your feedback. 
Looking forward for your proposed API. 

- Shirley 

-----Original Message-----
From: James Bottomley <jejb@...ux.ibm.com> 
Sent: Wednesday, December 4, 2019 11:33 AM
To: Zhao, Shirley <shirley.zhao@...el.com>; Mimi Zohar <zohar@...ux.ibm.com>; Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>; Jonathan Corbet <corbet@....net>
Cc: linux-integrity@...r.kernel.org; keyrings@...r.kernel.org; linux-doc@...r.kernel.org; linux-kernel@...r.kernel.org; 'Mauro Carvalho Chehab' <mchehab+samsung@...nel.org>; Zhu, Bing <bing.zhu@...el.com>; Chen, Luhai <luhai.chen@...el.com>
Subject: Re: One question about trusted key of keyring in Linux kernel.

On Wed, 2019-12-04 at 03:01 +0000, Zhao, Shirley wrote:
> Hi, James,
> 
> Using policy digest to reload trusted key, doesn't work, either. 
> Please check the steps below. 
> I think policy digest should be calculated by TPM when verifying the 
> policy to reload key.

You misunderstand my meaning: the API we have now doesn't work; the key blob the kernel returns currently after key create won't reload because it contains extraneous data.  I was proposing a working API I thought might replace it, but obviously it has to be coded up and accepted into a kernel version before you can use it.

If you want to get trusted keys working today, I think the TPM 1.2 API still works if you have a TPM 1.2 system.

James