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<a href="https://gitlab.com/tomato42">Hubert Kario</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/918#note_141836000">lib/handshake.c</a>:
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_handshake_log</span><span class="p">(</span><span class="s" style="color: #d14;">"HSK[%p]: Selected version %s</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span> <span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">pversion</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">name</span><span class="p">);</span></span>
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<td class="diff-line-num new_line" data-linenumber="791" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* set downgrade sentinel if the server supports TLS 1.3 and</span></span>
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<p dir="auto">one that does a TLS 1.2 resumption and then verifies that the sentinel was set? no</p>
<p dir="auto">but it's very simple to do, it requires doing a regular resumption test and only providing one more option to <code>ExpectServerHello</code> the <code>server_max_protocol=</code> with <code>(3, 4)</code> as parameter: <a href="https://github.com/tomato42/tlsfuzzer/blob/13479e5a44bc10e3577fc28b921c5b999a363ce9/scripts/test-downgrade-protection.py#L149-L178" rel="nofollow noreferrer noopener" target="_blank">test-downgrade-protection.py</a></p>
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