linux-kernel - Re: [PATCH 00/14] KEYS: Add support for PGP keys and signatures

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Date:   Tue, 11 Jan 2022 21:33:15 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-fscrypt@...r.kernel.org,
        linux-kernel@...r.kernel.org, zohar@...ux.ibm.com,
        ebiggers@...nel.org, dhowells@...hat.com, dwmw2@...radead.org,
        herbert@...dor.apana.org.au, davem@...emloft.net
Subject: Re: [PATCH 00/14] KEYS: Add support for PGP keys and signatures

On 11.01.2022 19:03, Roberto Sassu wrote:
> Support for PGP keys and signatures was proposed by David long time ago,
> before the decision of using PKCS#7 for kernel modules signatures
> verification was made. After that, there has been not enough interest to
> support PGP too.
> 
> Lately, when discussing a proposal of introducing fsverity signatures in
> Fedora [1], developers expressed their preference on not having a separate
> key for signing, which would complicate the management of the distribution.
> They would be more in favor of using the same PGP key, currently used for
> signing RPM headers, also for file-based signatures (not only fsverity, but
> also IMA ones).

Aren't PGP keys simply RSA / ECC / EdDSA keys with additional metadata?
Can't they be unwrapped from their (complex) PGP format in userspace and
loaded raw into the kernel, in a similar way as they are sometimes used
for SSH authentication?

This will save us from having to add complex parsers (a well-known source
of bugs) into the kernel - I guess there aren't any plans to add an
in-kernel PGP Web of Trust implementation.

Thanks,
Maciej