From: Roberto Sassu <roberto.sassu@huawei.com>
To: Mimi Zohar <zohar@linux.ibm.com>, "mjg59@google.com" <mjg59@google.com>
Cc: "linux-integrity@vger.kernel.org"
<linux-integrity@vger.kernel.org>,
"linux-security-module@vger.kernel.org"
<linux-security-module@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v6 10/11] ima: Introduce template field evmsig and write to field sig as fallback
Date: Wed, 12 May 2021 10:55:29 +0000 [thread overview]
Message-ID: <cca5e15939cc46b39d436cb7578c26e3@huawei.com> (raw)
In-Reply-To: <f1e16fe91bd80437ea2cf9ed60c40a3687fa0e40.camel@linux.ibm.com>
> From: Mimi Zohar [mailto:zohar@linux.ibm.com]
> Sent: Wednesday, May 12, 2021 12:12 AM
> Hi Roberto,
>
> On Wed, 2021-05-05 at 13:33 +0200, Roberto Sassu wrote:
> > With the patch to accept EVM portable signatures when the
> > appraise_type=imasig requirement is specified in the policy, appraisal can
> > be successfully done even if the file does not have an IMA signature.
> >
> > However, remote attestation would not see that a different signature type
> > was used, as only IMA signatures can be included in the measurement list.
> > This patch solves the issue by introducing the new template field 'evmsig'
> > to show EVM portable signatures and by including its value in the existing
> > field 'sig' if the IMA signature is not found.
>
> With this patch, instead of storing the file data signature, the file
> metadata signature is stored in the IMA measurement list, as designed.
> There's a minor problem. Unlike the file data signature, the
> measurement list record does not contain all the information needed to
> verify the file metadata signature.
Ok, we could add new template fields later.
Roberto
HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Li Peng, Li Jian, Shi Yanli
> thanks,
>
> Mimi
next prev parent reply other threads:[~2021-05-12 10:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-05 11:29 [PATCH v6 00/11] evm: Improve usability of portable signatures Roberto Sassu
2021-05-05 11:29 ` [PATCH v6 01/11] evm: Execute evm_inode_init_security() only when an HMAC key is loaded Roberto Sassu
2021-05-05 11:29 ` [PATCH v6 02/11] evm: Load EVM key in ima_load_x509() to avoid appraisal Roberto Sassu
2021-05-05 11:29 ` [PATCH v6 03/11] evm: Refuse EVM_ALLOW_METADATA_WRITES only if an HMAC key is loaded Roberto Sassu
2021-05-11 13:41 ` Mimi Zohar
2021-05-11 14:12 ` Roberto Sassu
2021-05-11 19:53 ` Mimi Zohar
2021-05-05 11:29 ` [PATCH v6 04/11] evm: Introduce evm_status_revalidate() Roberto Sassu
2021-05-11 13:42 ` Mimi Zohar
2021-05-05 11:33 ` [PATCH v6 05/11] evm: Introduce evm_hmac_disabled() to safely ignore verification errors Roberto Sassu
2021-05-07 13:31 ` [RESEND][PATCH " Roberto Sassu
2021-05-11 13:42 ` Mimi Zohar
2021-05-05 11:33 ` [PATCH v6 06/11] evm: Allow xattr/attr operations for portable signatures Roberto Sassu
2021-05-05 11:33 ` [PATCH v6 07/11] evm: Pass user namespace to set/remove xattr hooks Roberto Sassu
2021-05-05 11:33 ` [PATCH v6 08/11] evm: Allow setxattr() and setattr() for unmodified metadata Roberto Sassu
2021-05-11 14:11 ` Mimi Zohar
2021-05-11 14:21 ` Roberto Sassu
2021-05-11 14:40 ` Mimi Zohar
2021-05-11 14:54 ` Roberto Sassu
2021-05-11 20:00 ` Mimi Zohar
2021-05-05 11:33 ` [PATCH v6 09/11] ima: Allow imasig requirement to be satisfied by EVM portable signatures Roberto Sassu
2021-05-05 11:33 ` [PATCH v6 10/11] ima: Introduce template field evmsig and write to field sig as fallback Roberto Sassu
2021-05-11 22:12 ` Mimi Zohar
2021-05-12 10:55 ` Roberto Sassu [this message]
2021-05-05 11:33 ` [PATCH v6 11/11] ima: Don't remove security.ima if file must not be appraised Roberto Sassu
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