linux-kernel - Re: [PATCH v4 4/6] KEYS: X.509: Parse Key Usage

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Date:   Fri, 10 Feb 2023 22:39:33 +0000
From:   Eric Snowberg <eric.snowberg@...cle.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
CC:     Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "dmitry.kasatkin@...il.com" <dmitry.kasatkin@...il.com>,
        "paul@...l-moore.com" <paul@...l-moore.com>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "serge@...lyn.com" <serge@...lyn.com>,
        "pvorel@...e.cz" <pvorel@...e.cz>,
        "tadeusz.struk@...el.com" <tadeusz.struk@...el.com>,
        Kanth Ghatraju <kanth.ghatraju@...cle.com>,
        Konrad Wilk <konrad.wilk@...cle.com>,
        "erpalmer@...ux.vnet.ibm.com" <erpalmer@...ux.vnet.ibm.com>,
        "coxu@...hat.com" <coxu@...hat.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-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH v4 4/6] KEYS: X.509: Parse Key Usage



> On Feb 9, 2023, at 8:48 PM, Jarkko Sakkinen <jarkko@...nel.org> wrote:
> 
> On Mon, Feb 06, 2023 at 09:59:56PM -0500, Eric Snowberg wrote:
>> Parse the X.509 Key Usage.  The key usage extension defines the purpose of
>> the key contained in the certificate.
>> 
>>   id-ce-keyUsage OBJECT IDENTIFIER ::=  { id-ce 15 }
>> 
>>      KeyUsage ::= BIT STRING {
>>           digitalSignature        (0),
>>           contentCommitment       (1),
>>           keyEncipherment         (2),
>>           dataEncipherment        (3),
>>           keyAgreement            (4),
>>           keyCertSign             (5),
>>           cRLSign                 (6),
>>           encipherOnly            (7),
>>           decipherOnly            (8) }
>> 
>> If the keyCertSign or digitalSignature is set, store it in the
>> public_key structure.  This will be used in a follow on patch that
>> requires knowing the certificate key usage type.
> 
> It would be better to shortly explain why we want to know key usage
> type, rather than give zero information with "follow on patch”.

Ok, I will add this in the next round, thanks.