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From: Mimi Zohar <zohar@linux.ibm.com>
To: Roberto Sassu <roberto.sassu@huawei.com>, mjg59@google.com
Cc: linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	silviu.vlasceanu@huawei.com
Subject: Re: [PATCH v3 02/11] evm: Load EVM key in ima_load_x509() to avoid appraisal
Date: Wed, 02 Dec 2020 12:27:34 -0500	[thread overview]
Message-ID: <74ccede608479a55df4a7c9b446f840aedf8bd68.camel@linux.ibm.com> (raw)
In-Reply-To: <20201111092302.1589-3-roberto.sassu@huawei.com>

On Wed, 2020-11-11 at 10:22 +0100, Roberto Sassu wrote:
> Public keys do not need to be appraised by IMA as the restriction on the
> IMA/EVM keyrings ensures that a key can be loaded only if it is signed with
> a key in the primary or secondary keyring.

Let's clean this up a bit.
- The public builtin keys ...
- IMA/EVM trusted keyrings ...
- on the builtin or secondary keyrings

> However, when evm_load_x509() is called, appraisal is already enabled and
> a valid IMA signature must be added to the EVM key to pass verification.
> 
> Since the restriction is applied on both IMA and EVM keyrings, it is safe

and update:
- IMA and EVM trusted keyrings 

> to disable appraisal also when the EVM key is loaded. This patch calls
> evm_load_x509() inside ima_load_x509() if CONFIG_IMA_LOAD_X509 is defined.

, which crosses the normal IMA and EVM boundary,

thanks,

Mimi


  reply	other threads:[~2020-12-02 17:31 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-11  9:22 [PATCH v3 00/11] evm: Improve usability of portable signatures Roberto Sassu
2020-11-11  9:22 ` [PATCH v3 01/11] evm: Execute evm_inode_init_security() only when an HMAC key is loaded Roberto Sassu
2020-12-02 17:03   ` Mimi Zohar
2020-11-11  9:22 ` [PATCH v3 02/11] evm: Load EVM key in ima_load_x509() to avoid appraisal Roberto Sassu
2020-12-02 17:27   ` Mimi Zohar [this message]
2021-03-01 18:06   ` Mimi Zohar
2020-11-11  9:22 ` [PATCH v3 03/11] evm: Refuse EVM_ALLOW_METADATA_WRITES only if an HMAC key is loaded Roberto Sassu
2020-12-02 21:07   ` Mimi Zohar
2020-11-11  9:22 ` [PATCH v3 04/11] ima: Move ima_reset_appraise_flags() call to post hooks Roberto Sassu
2020-12-02 11:56   ` Roberto Sassu
2020-12-03 20:43     ` Mimi Zohar
2020-11-11  9:22 ` [PATCH v3 05/11] evm: Introduce evm_status_revalidate() Roberto Sassu
2020-11-11  9:22 ` [PATCH v3 06/11] evm: Ignore INTEGRITY_NOLABEL if no HMAC key is loaded Roberto Sassu
2020-12-03 20:42   ` Mimi Zohar
2020-12-04  8:05     ` Roberto Sassu
2020-12-04 13:04       ` Mimi Zohar
2020-12-04 14:59         ` Roberto Sassu
2020-11-11  9:22 ` [PATCH v3 07/11] evm: Allow xattr/attr operations for portable signatures Roberto Sassu
2020-11-11  9:22 ` [PATCH v3 08/11] evm: Allow setxattr() and setattr() for unmodified metadata Roberto Sassu
2020-11-18 17:58   ` kernel test robot
2020-11-11  9:23 ` [PATCH v3 09/11] ima: Allow imasig requirement to be satisfied by EVM portable signatures Roberto Sassu
2020-11-11  9:23 ` [PATCH v3 10/11] ima: Introduce template field evmsig and write to field sig as fallback Roberto Sassu
2020-11-11  9:23 ` [PATCH v3 11/11] ima: Don't remove security.ima if file must not be appraised Roberto Sassu
2020-12-01 20:52 ` [PATCH v3 00/11] evm: Improve usability of portable signatures Mimi Zohar

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