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[dmarc-ietf] Definition of "value" in RFC8601

Damian Lukowski <rfc@arcsin.de> Sat, 28 March 2020 10:39 UTC

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From: Damian Lukowski <rfc@arcsin.de>
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Date: Sat, 28 Mar 2020 11:39:59 +0100
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Subject: [dmarc-ietf] Definition of "value" in RFC8601
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Hello,

RFC8601 section 2.2 defines

> authserv-id = value
>             ; see below for a description of this element
> [...]
> The "value" is as defined in Section 5.1 of [MIME], with
> "quoted-string" updated as specified in [RFC6532].
[MIME] (RFC2045) section 5.1

> value := token / quoted-string
> token := 1*<any (US-ASCII) CHAR except SPACE, CTLs,
>             or tspecials>

The token is not said to be updated by [RFC6532] as is quoted-string, so
by my interpretation non-ASCII cannot be used without quotes.

If so, then current implementations of OpenDKIM and OpenDMARC are wrong
or imcomplete, as they do not check for Non-ASCII AuthservID and produce
headers like

> Authentication-Results: öde; dkim=none; dkim-atps=neutral
Is my understanding correct?

Regards
 Damian

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