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Date: Thu, 1 Feb 2024 09:45:36 -0800
From: nightmare.yeah27@...ecat.org
To: oss-security@...ts.openwall.com
Subject: Re: Python standard library defaults to insecure TLS for mail
protocols
On Thu, Feb 01, 2024 at 12:31:00PM +0100, Hanno Böck wrote:
> Also relevant is RFC 8314, which contains guidelines for TLS
> connections in email protocols [5]. ("MUAs MUST validate TLS server
> certificates [...]") It targets client software, but I believe it is
> reasonable to apply the same standards to client APIs.
Relaying *MTAs* do not usually verify the certificate of the server
they connect to. When they do, it creates problems because MTA
certificates are very often self-signed. IIRC Yahoo relays in
particular used to have this problem (or still do?)
It is true that MTAs are not usually written in Python :-) So maybe
the proposal is OK. But there's a general point to note here, namely
not all protocols are the same wrt TLS.
--
Ian
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