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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/498#note_94961005">lib/ext/server_cert_type.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_session_server_cert_type_set</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">cert_type</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_E_SUCCESS</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// No valid cert type found</span></span>
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<td class="diff-line-num new new_line" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Clean-up</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_free_datum</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">cert_types</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="c1" style="color: #998; font-style: italic;">// server mode</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Compare packet length with expected packet length.</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="c"> <span class="n" style="color: #333;">DECR_LEN</span><span class="p">(</span><span class="n" style="color: #333;">len</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<p dir="auto">The problem is that you cannot do that. The PSK extension must be sent last according to tls 1.3, and the order of parsing and sending is determined by the order in that structure. The preshared key extension has parse type <code>GNUTLS_EXT_TLS</code> which is the type to be parsed last from the "exported" parse types. However there is the type <code>_GNUTLS_EXT_TLS_POST_CS</code> which is used by internal extensions and is parsed after the <code>EXT_TLS</code> type by <code>read_client_hello</code>. Would that work?</p>
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