linux-kernel - Re: [PATCH 1/2] ima: Add machine keyring reference to IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR

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Date:   Mon, 06 Nov 2023 14:33:53 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>
Cc:     dmitry.kasatkin@...il.com, jarkko@...nel.org, paul@...l-moore.com,
        jmorris@...ei.org, serge@...lyn.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ima: Add machine keyring reference to
 IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY

Hi Eric,

The subject line is referred to as the 'summary' phrase.  As far as I'm
aware the length is still between 70-75 charcaters.  Refer to 
https://www.kernel.org/doc/Documentation/process/submitting-patches.rst
.

On Thu, 2023-11-02 at 13:06 -0400, Eric Snowberg wrote:
> When the machine keyring is enabled, it may be used as a trust source
> for the .ima keyring.  Add a reference to this in
> IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY.
> 
> Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>
> ---
>  security/integrity/ima/Kconfig | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
> index a6bd817efc1a..c5dc0fabbc8b 100644
> --- a/security/integrity/ima/Kconfig
> +++ b/security/integrity/ima/Kconfig
> @@ -243,7 +243,7 @@ config IMA_APPRAISE_MODSIG
>  	   to accept such signatures.
>  
>  config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
> -	bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
> +	bool "Permit keys validly signed by a built-in, secondary or machine CA cert (EXPERIMENTAL)"

Please add 'machine' in between built-in and secondary, like described
below.

>  	depends on SYSTEM_TRUSTED_KEYRING
>  	depends on SECONDARY_TRUSTED_KEYRING
>  	depends on INTEGRITY_ASYMMETRIC_KEYS
> @@ -251,14 +251,14 @@ config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
>  	default n
>  	help
>  	  Keys may be added to the IMA or IMA blacklist keyrings, if the
> -	  key is validly signed by a CA cert in the system built-in or
> -	  secondary trusted keyrings. The key must also have the
> -	  digitalSignature usage set.
> +	  key is validly signed by a CA cert in the system built-in,
> +	  machine (if configured), or secondary trusted keyrings. The
> +	  key must also have the digitalSignature usage set.
>  
>  	  Intermediate keys between those the kernel has compiled in and the
>  	  IMA keys to be added may be added to the system secondary keyring,
>  	  provided they are validly signed by a key already resident in the
> -	  built-in or secondary trusted keyrings.
> +	  built-in, machine (if configured) or secondary trusted keyrings.
>  
>  config IMA_BLACKLIST_KEYRING
>  	bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"

-- 
thanks,

Mimi