From: Mimi Zohar <zohar@linux.ibm.com>
To: THOBY Simon <Simon.THOBY@viveris.fr>,
"dmitry.kasatkin@gmail.com" <dmitry.kasatkin@gmail.com>,
"linux-integrity@vger.kernel.org"
<linux-integrity@vger.kernel.org>,
BARVAUX Didier <Didier.BARVAUX@viveris.fr>
Subject: Re: [PATCH v4 3/5] IMA: add support to restrict the hash algorithms used for file appraisal
Date: Tue, 27 Jul 2021 16:38:12 -0400 [thread overview]
Message-ID: <ca33ec3c4cc9625467ce842ebdb17b3ed61d2ab3.camel@linux.ibm.com> (raw)
In-Reply-To: <20210727163330.790010-4-simon.thoby@viveris.fr>
Hi Simon,
On Tue, 2021-07-27 at 16:33 +0000, THOBY Simon wrote:
> The kernel accepts any hash algorithm as a value for the security.ima
> xattr. Users may wish to restrict the accepted algorithms to only
> support strong cryptographic ones.
>
> Provide the plumbing to restrict the permitted set of hash algorithms
> used for verifying file hashes and digest algorithms stored in
> security.ima xattr.
>
> This do not apply only to IMA in hash mode, it also works with digital
> signatures, in which case it checks that the hash (which was then
> signed by the trusted private key) have been generated with one of
> the algortihms whitelisted for this specific rule.
>
> Signed-off-by: Simon Thoby <simon.thoby@viveris.fr>
I haven't yet tested building the kernel after applying each patch.
Assuming that it compiles properly:
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
next prev parent reply other threads:[~2021-07-27 20:38 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 16:33 [PATCH v4 0/5] IMA: restrict the accepted digest algorithms for THOBY Simon
2021-07-27 16:33 ` [PATCH v4 1/5] IMA: remove the dependency on CRYPTO_MD5 THOBY Simon
2021-07-27 17:57 ` Mimi Zohar
2021-07-27 16:33 ` [PATCH v4 2/5] IMA: block writes of the security.ima xattr with unsupported algorithms THOBY Simon
2021-07-27 20:32 ` Mimi Zohar
2021-07-28 7:00 ` THOBY Simon
2021-07-28 12:43 ` Mimi Zohar
2021-07-28 12:53 ` THOBY Simon
2021-07-28 13:09 ` Mimi Zohar
2021-07-27 16:33 ` [PATCH v4 3/5] IMA: add support to restrict the hash algorithms used for file appraisal THOBY Simon
2021-07-27 20:38 ` Mimi Zohar [this message]
2021-07-27 16:33 ` [PATCH v4 4/5] IMA: add a policy option to restrict xattr hash algorithms on appraisal THOBY Simon
2021-07-27 21:07 ` Mimi Zohar
2021-07-27 16:33 ` [PATCH v4 5/5] IMA: introduce a new policy option func=SETXATTR_CHECK THOBY Simon
2021-07-27 17:25 ` Mimi Zohar
2021-07-27 17:58 ` THOBY Simon
2021-07-27 17:47 ` [PATCH v4 0/5] IMA: restrict the accepted digest algorithms for Mimi Zohar
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