On Thu, Jul 13, 2023 at 10:30:06PM +0300, Evgeniy Berdnikov via Exim-users wrote:
> On Thu, Jul 13, 2023 at 11:11:31AM -0400, Viktor Dukhovni via Exim-users wrote:
> > Perhaps the OpenSSL library could change the message to be:
> >
> > "TLS fatal alert from <peer|client|server>: bad certificate"
>
> Does TLS/SSL protocol provide enough information to conclude that alert
> should be interpreted as "bad certificate" message from other side?
Yes.
https://datatracker.ietf.org/doc/html/rfc8446#appendix-B.2
> Does it provide any granularity on this badness, such as time window,
> signature, algorithms and so on?
No.
> As far as I understand from reading traffic captures, there are no text
> fields in TLS/SSL alert messages. It looks like severe design flaw
> of this protocol, leading to problems in diagnostic on both sides.
Alerts carry just an alert level and number.
https://datatracker.ietf.org/doc/html/rfc8446#section-6
--
Viktor.
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