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From: Eric Snowberg <eric.snowberg@oracle.com>
To: Jarkko Sakkinen <jarkko@kernel.org>
Cc: keyrings@vger.kernel.org,
	linux-integrity <linux-integrity@vger.kernel.org>,
	Mimi Zohar <zohar@linux.ibm.com>,
	David Howells <dhowells@redhat.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S . Miller" <davem@davemloft.net>,
	James Morris <jmorris@namei.org>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	keescook@chromium.org, gregkh@linuxfoundation.org,
	torvalds@linux-foundation.org, scott.branden@broadcom.com,
	weiyongjun1@huawei.com, nayna@linux.ibm.com, ebiggers@google.com,
	ardb@kernel.org, nramas@linux.microsoft.com, lszubowi@redhat.com,
	linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	James.Bottomley@HansenPartnership.com, pjones@redhat.com,
	"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>
Subject: Re: [PATCH v5 00/12] Enroll kernel keys thru MOK
Date: Wed, 8 Sep 2021 11:09:44 -0600	[thread overview]
Message-ID: <17C81066-DBE8-4DB0-B66B-822BF6EFF67C@oracle.com> (raw)
In-Reply-To: <7f9fb65a4ee20c337646a1fc887cd24365c2c59e.camel@kernel.org>


> On Sep 8, 2021, at 10:03 AM, Jarkko Sakkinen <jarkko@kernel.org> wrote:
> 
> On Tue, 2021-09-07 at 12:00 -0400, Eric Snowberg wrote:
>> Many UEFI Linux distributions boot using shim.  The UEFI shim provides
>> what is called Machine Owner Keys (MOK).  Shim uses both the UEFI Secure
>> Boot DB and MOK keys to validate the next step in the boot chain.  The
>> MOK facility can be used to import user generated keys.  These keys can
>> be used to sign an end-user development kernel build.  When Linux boots,
>> pre-boot keys (both UEFI Secure Boot DB and MOK keys) get loaded in the
>> Linux .platform keyring.  
>> 
>> Currently, pre-boot keys are not trusted within the Linux trust boundary
>> [1]. These platform keys can only be used for kexec. If an end-user
> 
> What exactly is "trust boundary"? And what do you mean when you say that
> Linux "trusts" something? AFAIK, software does not have feelings. Please,
> just speak about exact things.

I am using terminology used previously by others when addressing this issue.  
If I should be using different terminology, please advise. The kernel does not 
trust pre-boot keys within it, meaning these pre-boot keys can not be used to 
validate items within the kernel. This is the “trust boundary”. Preboot keys are
on one side of the boundary, compiled-in keys are on the other.  MOK keys are 
pre-boot keys.  Currently they can not be used to validate things within the 
kernel itself (kernel modules, IMA keys, etc).



      parent reply	other threads:[~2021-09-08 17:10 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-07 16:00 [PATCH v5 00/12] Enroll kernel keys thru MOK Eric Snowberg
2021-09-07 16:00 ` [PATCH v5 01/12] integrity: Introduce a Linux keyring called machine Eric Snowberg
2021-09-09 13:55   ` Jarkko Sakkinen
2021-09-09 15:19   ` Mimi Zohar
2021-09-09 17:32     ` Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 02/12] integrity: Do not allow machine keyring updates following init Eric Snowberg
2021-09-09 13:43   ` Jarkko Sakkinen
2021-09-07 16:01 ` [PATCH v5 03/12] KEYS: CA link restriction Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 04/12] integrity: restrict INTEGRITY_KEYRING_MACHINE to restrict_link_by_ca Eric Snowberg
2021-09-09 13:49   ` Jarkko Sakkinen
2021-09-09 17:25   ` Mimi Zohar
2021-09-09 17:53     ` Eric Snowberg
2021-09-09 18:19       ` Mimi Zohar
2021-09-07 16:01 ` [PATCH v5 05/12] integrity: add new keyring handler for mok keys Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 06/12] KEYS: add a reference to machine keyring Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 07/12] KEYS: Introduce link restriction to include builtin, secondary and machine keys Eric Snowberg
2021-09-09 17:26   ` Mimi Zohar
2021-09-09 18:03     ` Eric Snowberg
2021-09-09 18:19       ` Mimi Zohar
2021-09-07 16:01 ` [PATCH v5 08/12] KEYS: integrity: change link restriction to trust the machine keyring Eric Snowberg
2021-09-09 17:27   ` Mimi Zohar
2021-09-07 16:01 ` [PATCH v5 09/12] KEYS: link secondary_trusted_keys to machine trusted keys Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 10/12] integrity: store reference to machine keyring Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 11/12] integrity: Trust MOK keys if MokListTrustedRT found Eric Snowberg
2021-09-07 16:01 ` [PATCH v5 12/12] integrity: Only use machine keyring when uefi_check_trust_mok_keys is true Eric Snowberg
2021-09-09 13:58   ` Jarkko Sakkinen
2021-09-08 16:03 ` [PATCH v5 00/12] Enroll kernel keys thru MOK Jarkko Sakkinen
2021-09-08 16:49   ` Jarkko Sakkinen
2021-09-08 22:25     ` Eric Snowberg
2021-09-09 13:02       ` Mimi Zohar
2021-09-08 17:09   ` Eric Snowberg [this message]

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