linux-kernel - Re: [PATCH 0/4] Add CA enforcement in the machine keyring

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Date:   Mon, 7 Mar 2022 18:55:19 +0000
From:   Eric Snowberg <eric.snowberg@...cle.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
CC:     Jarkko Sakkinen <jarkko@...nel.org>,
        David Howells <dhowells@...hat.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        Stefan Berger <stefanb@...ux.ibm.com>,
        "nayna@...ux.ibm.com" <nayna@...ux.ibm.com>,
        "mic@...ux.microsoft.com" <mic@...ux.microsoft.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 0/4] Add CA enforcement in the machine keyring 



> On Mar 6, 2022, at 4:33 PM, Mimi Zohar <zohar@...ux.ibm.com> wrote:
> 
> Hi Eric,
> 
> On Tue, 2022-03-01 at 12:36 -0500, Eric Snowberg wrote:
>> A key added to the IMA keyring must be signed by a key contained in either the
>> built-in trusted or secondary trusted keyring. IMA also requires these keys 
>> to be a CA. The only option for an end-user to add their own CA is to compile
>> it into the kernel themselves or to use the insert-sys-cert.  Many end-users 
>> do not want to compile their own kernels.  With the insert-sys-cert option, 
>> there are missing upstream changes. 
>> 
>> Currently, all Machine Owner Keys (MOK) load into the machine keyring.  Add 
>> a new Kconfig option to only allow CA keys into the machine keyring.  When 
>> compiled with the new INTEGRITY_MACHINE_KEYRING_CA_ENFORCED Kconfig, non CA 
>> keys will load into the platform keyring instead. This will allow the end-
>> user to enroll their own CA key into the machine keyring for use with IMA.
> 
> In addition to only loading the MOK CA keys onto the .machine keyring,
> the keyUsage should be required and limited to keyCertSign.

Ok, I’ll add this in the next round.