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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/994#note_168475016">src/certtool.c</a>:
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">ca_crt</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">secs</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">gnutls_x509_crt_get_expiration_time</span><span class="p">(</span><span class="n" style="color: #333;">ca_crt</span><span class="p">)))</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">time_t</span> <span class="n" style="color: #333;">exp</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gnutls_x509_crt_get_expiration_time</span><span class="p">(</span><span class="n" style="color: #333;">ca_crt</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC442" class="line" lang="c"> <span class="n" style="color: #333;">fprintf</span><span class="p">(</span><span class="n" style="color: #333;">stderr</span><span class="p">,</span> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">Expiration time: %s"</span><span class="p">,</span> <span class="n" style="color: #333;">ctime</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">secs</span><span class="p">));</span></span>
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<pre style="margin: 0;">-<span id="LC443" class="line" lang="c"> <span class="n" style="color: #333;">fprintf</span><span class="p">(</span><span class="n" style="color: #333;">stderr</span><span class="p">,</span> <span class="s" style="color: #d14;">"CA expiration time: %s"</span><span class="p">,</span> <span class="n" style="color: #333;">ctime</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">exp</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC442" class="line" lang="c"> <span class="n" style="color: #333;">fprintf</span><span class="p">(</span><span class="n" style="color: #333;">stderr</span><span class="p">,</span> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">Expiration time: %s"</span><span class="p">,</span> <span class="n" style="color: #333;">ctime</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">secs</span><span class="p">));</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">//lgtm [cpp/potentially-dangerous-function]</span></span></span>
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<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>In this case I would even throw in that ctime() indeed should be avoided. Just think of copy&pasting code into a multi-threaded application or library. After an RCE, someone will ask "where did this code come from ? Oh from GnuTLS - what a crap !".</p>
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<p dir="auto"><code>ctime()</code> is perfectly fine the way it is used in this application. I understand someone else can misuse it but I do not see much value in writing code for other applications than the one intended for. Anyway, I was convinced to make that warning go in general, so I've pushed for another version which uses strftime with '%c'.</p>
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