[gnutls-devel] GnuTLS | Disable TLS 1.3 dynamically during handshake if bad KX is enabed in priority (#825)

[Development of GNU's TLS library]

Dmitry Eremin-Solenikov created an issue:


  For now priority setup will disable TLS 1.3 if 'unsupported' KX is enabled (like SRP or PSK/RSA-PSK). This causes bad effects when adding VKO-GOST KX support, as one can not have `-VER-TLS-ALL:+VER-TLS1.3:+KX-ALL` setup anymore. It looks like priorities should be handled during SERVER HELLO stage:
if TLS 1.3 is enabled and negotiation fails, switch to older TLS version and try negotiating again.

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