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<a href="https://gitlab.com/hanno">Hanno Böck</a> created an issue:
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<p dir="auto">I noticed a curious behavior of gnutls-cli regarding OCSP checks and intermediate certs.</p>
<p dir="auto">It seems when passing the --ocsp option the intermediate cert will be ocsp checked, but only if ocsp stapling is not set.</p>
<p dir="auto">To test (first fake a bad ocsp server by redirecting identrust's OCSP to localhost):
<code>echo "127.0.0.1 isrg.trustid.ocsp.identrust.com" >> /etc/hosts</code>
<code>gnutls-cli --ocsp zucker.schokokeks.org:443</code>
<code>gnutls-cli --ocsp letsencrypt.org:443</code></p>
<p dir="auto">The first connection will succeed, the second will not. The difference is the first host enables OCSP Stapling. I believe what's happening is that when the client detects OCSP stapling it will skip direct OCSP checks. But Stapling only staples the OCSP reply for the end-entity cert, not the intermediate.</p>
<p dir="auto">I generally think it's valuable to have a way to check the intermediate. I am not sure it should be done by default. In any case: I guess this should not depend on OCSP stapling.</p>
<p dir="auto">I propose one of the following changes:</p>
<ol dir="auto">
<li>Declare/document that --ocsp always checks the intermediate and if the end-entity OCSP comes via stapling still connect to the intermediate.</li>
<li>Declare/document that --ocsp never checks the intermediate and add another option --ocsp-check-chain or something like this that will enable intermediate checks.</li>
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