netdev - Re: [PATCH net-next] [RESEND] wireguard: disable in FIPS mode

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Message-ID: <YG4gO15Q2CzTwlO7@quark.localdomain>
Date:   Wed, 7 Apr 2021 14:12:27 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     netdev@...r.kernel.org, "Jason A . Donenfeld" <Jason@...c4.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH net-next] [RESEND] wireguard: disable in FIPS mode

On Wed, Apr 07, 2021 at 07:39:20PM +0800, Hangbin Liu wrote:
> As the cryptos(BLAKE2S, Curve25519, CHACHA20POLY1305) in WireGuard are not
> FIPS certified, the WireGuard module should be disabled in FIPS mode.
> 
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

I think you mean "FIPS allowed", not "FIPS certified"?  Even if it used FIPS
allowed algorithms like AES, the Linux kernel doesn't come with any sort of FIPS
certification out of the box.

Also, couldn't you just consider WireGuard to be outside your FIPS module
boundary, which would remove it from the scope of the certification?

And how do you handle all the other places in the kernel that use ChaCha20 and
SipHash?  For example, drivers/char/random.c?

- Eric