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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/711#note_92158495">lib/handshake-tls13.c</a>:
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="c"> <span class="n" style="color: #333;">IMED_RET</span><span class="p">(</span><span class="s" style="color: #d14;">"send finished"</span><span class="p">,</span> <span class="n" style="color: #333;">ret</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* fall through */</span></span>
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361
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="c"> <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">STATE107</span><span class="p">:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="414" 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="LC414" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* At this point our sending keys should be the app keys</span></span>
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<td class="diff-line-num new new_line" data-linenumber="415" 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="LC415" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * see 4.4.4 at draft-ietf-tls-tls13-28 */</span></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="c"> <span class="n" style="color: #333;">generate_ap_traffic_keys</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="LC418" class="line" lang="c"> <span class="n" style="color: #333;">IMED_RET</span><span class="p">(</span><span class="s" style="color: #d14;">"generate app keys"</span><span class="p">,</span> <span class="n" style="color: #333;">ret</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC419" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* If the session is unauthenticated, try to optimize the handshake by</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * sending the session ticket early. */</span></span>
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<pre style="margin: 0;">+<span id="LC422" 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="p">(</span><span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">internals</span><span class="p">.</span><span class="n" style="color: #333;">hsk_flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="p">(</span><span class="n" style="color: #333;">HSK_CRT_REQ_SENT</span><span class="o" style="font-weight: 600;">|</span><span class="n" style="color: #333;">HSK_PSK_SELECTED</span><span class="p">)))</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="c"> <span class="n" style="color: #333;">STATE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">STATE107</span><span class="p">;</span></span>
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<p dir="auto">I am a bit confused with the use of STATE here; in the surrounding code it is used like this:</p>
<pre class="code highlight js-syntax-highlight c" lang="c" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; color: #998; font-style: italic; margin: 0;"><code><span id="LC1" class="line" lang="c"><span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">STATEXXX</span><span class="p">:</span></span>
<span id="LC2" 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;">do_something</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">AGAIN</span><span class="p">(</span><span class="n" style="color: #333;">STATEXXX</span><span class="p">));</span></span>
<span id="LC3" class="line" lang="c"> <span class="n" style="color: #333;">STATE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">STATEXXX</span><span class="p">;</span></span>
<span id="LC4" class="line" lang="c"> <span class="n" style="color: #333;">IMED_RET</span><span class="p">(</span><span class="s" style="color: #d14;">"something"</span><span class="p">,</span> <span class="n" style="color: #333;">ret</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
<span id="LC5" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* fallthrough */</span></span></code></pre>
<p dir="auto">If I understand correctly, this pattern is to allow callers to re-enter if any of the function returns EAGAIN. However, here, <code>generate_ap_traffic_keys()</code> is not reentrant, because it overwrites temp_secret. Wouldn't that be a problem?</p>
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