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<a href="https://gitlab.com/airtower-luna">Airtower</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_110620062">doc/cha-gtls-app.texi</a>:
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950
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<pre style="margin: 0;">+<span id="LC950" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="plaintext"> ret = gnutls_record_recv_early_data(session, buffer, sizeof(buffer));</span>
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952
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="plaintext"> assert(ret >= 0);</span>
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="plaintext"> ...</span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="plaintext"> return ret;</span>
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="plaintext">@}</span>
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="plaintext">int main()</span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="plaintext">@{</span>
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="plaintext"> ...</span>
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="plaintext"> gnutls_handshake_set_hook_function(server, GNUTLS_HANDSHAKE_END_OF_EARLY_DATA,</span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="plaintext"> GNUTLS_HOOK_POST, handshake_hook_func);</span>
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="plaintext"> ...</span>
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<div>
<p dir="auto">I don't have a conclusion to offer, but here are considerations from my <code>mod_gnutls</code> point of view:</p>
<ul dir="auto">
<li>Some HTTP-Requests can trigger actions on the server, so replay protection for those is critical. For simple downloads it doesn't matter.</li>
<li>A simple solution would be to leave allowing 0-RTT data to the user, maybe per path, possibly filtering for certain request types.</li>
<li>The problem with any settings other than "no 0-RTT" or "always accept 0-RTT" is: If we receive a request that isn't replay-safe we need a way to reject the early data and make the client send it again. This would probably get messy with the Apache stack, but a hook function that's called after receiving early data seems like an appropriate place for such a check.</li>
<li>Other than that, I'd prefer to read early data via <code>gnutls_record_recv</code> as usual. Using a special function in a hook is fine, but I'd rather avoid having a special case in the filter functions.</li>
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