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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_114129499">lib/tls13/anti_replay.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="421" 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="LC421" 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_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_EARLY_DATA_REJECTED</span><span class="p">);</span></span>
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422
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">out</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC424" 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="LC425" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="n" style="color: #333;">value</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="427" 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="LC427" class="line" lang="c"> <span class="n" style="color: #333;">value</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">db_retrieve_func</span><span class="p">(</span><span class="n" style="color: #333;">db_ptr</span><span class="p">,</span> <span class="n" style="color: #333;">key</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="428" 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="LC428" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">value</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="429" 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="LC429" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* We don't care about the data. */</span></span>
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<pre style="margin: 0;">+<span id="LC430" class="line" lang="c"> <span class="n" style="color: #333;">free</span><span class="p">(</span><span class="n" style="color: #333;">value</span><span class="p">.</span><span class="n" style="color: #333;">data</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_handshake_log</span><span class="p">(</span><span class="s" style="color: #d14;">"anti_replay: duplicate ClientHello found</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC432" 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_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_EARLY_DATA_REJECTED</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">out</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="c"> <span class="p">}</span></span>
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<p dir="auto">between this read and store there is a window that an session on another server in a pool would accept the same hello message.</p>
<p dir="auto">Seeing how <code>apr_memcache</code> works it has an <code>apr_memcache_add</code> command which can add only when it doesn't exist, and otherwise return an error. Maybe we can rely on that, instead on separate read and store?</p>
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