linux-kernel - Re: [PATCH v10 6/9] bpf: Add bpf_verify_pkcs7

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Message-ID: <CACYkzJ5ZCtgdCz=kBdUAkhD6UyzspqMsNyC32_VR0aLt=a3Okg@mail.gmail.com>
Date:   Fri, 12 Aug 2022 02:54:21 +0200
From:   KP Singh <kpsingh@...nel.org>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, corbet@....net, dhowells@...hat.com,
        jarkko@...nel.org, rostedt@...dmis.org, mingo@...hat.com,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        shuah@...nel.org, bpf@...r.kernel.org, linux-doc@...r.kernel.org,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 6/9] bpf: Add bpf_verify_pkcs7_signature() kfunc

On Wed, Aug 10, 2022 at 7:01 PM Roberto Sassu <roberto.sassu@...wei.com> wrote:
>
> Add the bpf_verify_pkcs7_signature() kfunc, to give eBPF security modules
> the ability to check the validity of a signature against supplied data, by
> using user-provided or system-provided keys as trust anchor.
>
> The new kfunc makes it possible to enforce mandatory policies, as eBPF
> programs might be allowed to make security decisions only based on data
> sources the system administrator approves.
>
> The caller should provide the data to be verified and the signature as eBPF
> dynamic pointers (to minimize the number of parameters) and a bpf_key
> structure containing a reference to the keyring with keys trusted for
> signature verification, obtained from bpf_lookup_user_key() or
> bpf_lookup_system_key().
>
> For bpf_key structures obtained from the former lookup function,
> bpf_verify_pkcs7_signature() completes the permission check deferred by
> that function by calling key_validate(). key_task_permission() is already
> called by the PKCS#7 code.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

Acked-by: KP Singh <kpsingh@...nel.org>