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<a href="https://gitlab.com/Vrancken">Tom</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/650#note_119373137">lib/ext/client_cert_type.c</a>:
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="c">    <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">i</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">num_cert_types</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="c">    <span class="n" style="color: #333;">priority_st</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">cert_priorities</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="c">    <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="n" style="color: #333;">tmp_cert_types</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// For type conversion</span></span>
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<td class="diff-line-num new_line old" data-linenumber="202" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="c">    <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">cert_types</span><span class="p">[</span><span class="n" style="color: #333;">GNUTLS_CRT_MAX</span><span class="p">];</span> <span class="c1" style="color: #998; font-style: italic;">// The list with supported cert types</span></span>
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<td class="diff-line-num new old_line" data-linenumber="205" 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="LC202" class="line" lang="c">    <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">cert_types</span><span class="p">[</span><span class="n" style="color: #333;">GNUTLS_CRT_MAX</span><span class="p">];</span> <span class="c1" style="color: #998; font-style: italic;">// The list with supported cert types<span class="idiff left right">. Inv: 0 <= cert type Id < 256</span></span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="c">    <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">version_entry_st</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">vers</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_version</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="c"></span>
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<td class="diff-line-num new_line old" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="c">    <span class="cm" style="color: #998; font-style: italic;">/* Only activate this extension if cert type negotiation is enabled</span></span>
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<td class="diff-line-num old old_line" data-linenumber="208" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<td class="diff-line-num new_line old" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">         * and we have cert credentials set */</span></span>
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<td class="diff-line-num new_line old" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">_gnutls_has_negotiate_ctypes</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span></span>
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<td class="diff-line-num new_line old" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="c">                    <span class="n" style="color: #333;">_gnutls_get_cred</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">GNUTLS_CRD_CERTIFICATE</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="c">    <span class="cm" style="color: #998; font-style: italic;">/* Only activate this extension if we have cert credentials set */</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="211" 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="LC206" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">_gnutls_get_cred</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">GNUTLS_CRD_CERTIFICATE</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span></span>
</pre>
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<div>
<p dir="auto">I was referring to a couple of discussions above this one ;-). The one where you first addressed this issue. I quote my reaction here:</p>
<blockquote dir="auto" style="color: #7f8fa4; border-left-width: 3px; border-left-color: #eaeaea; border-left-style: solid; margin: 0; padding: 0 0 0 15px;">
<p>We discussed this in the comments above (from your first review). we concluded that these extensions would always be enabled and that other cert types would need to be explicitly enabled via init flags. That means that in this case raw public keys are only enabled when you pass the <code>ENABLE_RAWPK</code> flag. These extensions will only negotiate enabled cert types. In case only the default is enabled then these extensions will not send anything. This is default behaviour according to the spec.
We also agreed on removed the old flag to enable these extensions explicitly because this is not needed anymore when we explicitly enable cert types via their own dedicated flags.</p>
</blockquote>
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