Re: disable renegotiation

John <[email protected]> Thu, 24 Jun 2021 19:09:05 +0000
Newsgroups gmane.network.gnutls.general
Message-ID <z874_sFIGsXFAoV1zz862WeanV4sJx8loly0cvCVQUCN7_rjW8zaQv2p7qWB2k8Ac172TqS3HqPMB25wq2Ql_JcAYGvOmn-b7rqoXExgYcg=@protonmail.com>
Asking my question again to those who know:
Is there currently a way in Gnutls to disable renegotiation on TLS and a way to disable client initiated secure renegotiation?

The option to disabling renegotiation is mentioned in RFC5746:
RFC5746: "TLS implementations SHOULD provide a mechanism to disable and enable renegotiation."

RFC5746: "Many servers can mitigate this attack simply by refusing to renegotiate at all."

For this to work, developers and/or users needs to be able to refuse client initiated renegotiation.

An user configurable implementation could have:
%DISABLE_RENEGOTIATION
%DISABLE_CLIENT_RENEGOTIATION

I am aware of the option to disable safe renegotiation. That seems to be limited to disabling safe renegotiation, which would likely leave the server vulnerable.

Thanks!

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