disable renogotiation

John <[email protected]> Wed, 16 Jun 2021 10:15:47 +0000
Newsgroups gmane.network.gnutls.general
Message-ID <JESwjMKBPu-95ANLjfB1Ya7wHUj8guu3uvFKVVCGatBhJPLRRnwUbVNQgJ3FZJjWJNwenwqeMooW7akmrp0EdnAE2JhCoYrhMv8RW_NIwg4=@protonmail.com>
Hello,

Is there a way in Gnutls to disable renogotiation on TLS and a way to disable client initiated secure renegotiation?

This is useful to harden the server. For example Exim4+Gnutls on Debian 10. There does not seem to be a need to support renegotiation or resumption on a mail server, because STARTTLS sessions are set up in each SMTP session. Disabling renegotiation reduces the attack surface.

Thanks

John

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