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<a href="https://gitlab.com/johnxba">John</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1252">#1252</a>
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<p dir="auto">RFC5746 (2010) paragraph 5. Security Considerations:<br>
"Many servers can mitigate this attack simply by refusing to renegotiate at all."<br>
"TLS implementations SHOULD provide a mechanism to disable and enable renegotiation."</p>
<p dir="auto">Users do not seem to have this option (e.g. %DISABLE_RENEGOTIATION).</p>
<p dir="auto">After RFC 5746 was published, DoS attacks, tools and papers were published regarding abuse of TLS renegotiation.</p>
<p dir="auto">Guidelines from security institutes call for disabling of client initiated renegotiation on servers to protect against attacks known and unknown. Users should have the option to do this. (e.g. %DISABLE_CLIENT_RENEGOTIATION).</p>
<p dir="auto">Servers do not need renegotiation when TLS sessions are short lived, for example small mail servers.</p>
<p dir="auto">Requested:<br>
%DISABLE_RENEGOTIATION: disable all renegotiation<br>
%DISABLE_CLIENT_RENEGOTIATION: disable all client initiated renegotiation</p>
<p dir="auto">Existing related settings:<br>
%PARTIAL_RENEGOTIATION [default]: allows safe renegotiation only (RFC5746)<br>
%DISABLE_SAFE_RENEGOTIATION: disable safe renegotiation extension (RFC5746)<br>
%UNSAFE_RENEGOTIATION: allow non-safe renegotiation (RFC5746)</p>
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