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<a href="https://gitlab.com/juaristi">Ander Juaristi</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/695#note_88239904">lib/stek.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="195" 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="LC195" class="line" lang="c"> <span class="p">};</span></span>
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<td class="diff-line-num new new_line" data-linenumber="196" 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="LC196" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="197" 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="LC197" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">unlikely</span><span class="p">(</span><span class="n" style="color: #333;">session</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ticket_data</span> <span class="o" style="font-weight: 600;">==</span> <span class="nb" style="color: #0086b3;">NULL</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ticket_data</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</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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<td class="diff-line-num new new_line" data-linenumber="198" 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="LC198" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_INTERNAL_ERROR</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="199" 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="LC199" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ticket_data</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">TICKET_KEY_NAME_SIZE</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="201" 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="LC201" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_DECRYPTION_FAILED</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="c"></span>
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<td class="diff-line-num new new_line" data-linenumber="203" 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="LC203" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">((</span><span class="n" style="color: #333;">retval</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rotate</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 class="mi" style="color: #099;">0</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">retval</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Is current key valid?</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We compare the first 16 bytes --> The key_name field.</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">memcmp</span><span class="p">(</span><span class="n" style="color: #333;">ticket_data</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span><span class="p">,</span></span>
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<p dir="auto"><a href="https://gitlab.com/nmav" data-user="105950" data-reference-type="user" data-container="body" data-placement="bottom" class="gfm gfm-project_member has-tooltip" title="Nikos Mavrogiannopoulos">@nmav</a> you are right. I had some code that did this initially, but then thought that would never happen and thrown that code away!</p>
<p dir="auto">But you are right. This can happen and we need to check for it. What the previous code did was (in <code>_gnutls_get_session_ticket_decryption_key</code>):</p>
<ol dir="auto">
<li>Check current key. If it matches, use it to decrypt the ticket.</li>
<li>If it doesn't match, compute the previous key. This is easy - you only need the T parameter, so you just do <code>--t</code> and re-compute TOTP with that value.</li>
<li>Check the previous key. If it matches, use it to decrypt the ticket.</li>
<li>Else throw the ticket away.</li>
</ol>
<p dir="auto">I will re-implement this algorithm and push again.</p>
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