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<a href="https://gitlab.com/dulanshuangqiao">dulanshuangqiao</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1672">#1672</a>
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<a href="#description-of-problem" aria-hidden="true" class="anchor" id="user-content-description-of-problem" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">GnuTLS accepts a critical Subject Key Identifier. OpenSSL and WolfSSL reject it. RFC 5280 requires the ext SKI must be marked as non-critical.</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#version-of-gnutls-used" aria-hidden="true" class="anchor" id="user-content-version-of-gnutls-used" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of gnutls used:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">gnutls-cli 3.8.9</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true" class="anchor" id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Ubuntu</p>
<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#how-reproducible" aria-hidden="true" class="anchor" id="user-content-how-reproducible" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Steps to Reproduce:</p>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0 0 1rem; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">one certtool --verify --load-ca-certificate RootCA.pem --infile Cert17408142963.pem <a href="https://gitlab.com/-/project/179611/uploads/7163941bc5e98a343961839ab277cd27/Cert17408142963.pem" data-canonical-src="/uploads/7163941bc5e98a343961839ab277cd27/Cert17408142963.pem" data-link="true" class="gfm" style="margin-top: 0;">Cert17408142963.pem</a><a href="https://gitlab.com/-/project/179611/uploads/2eef74ceb38fe45241449d368ea4fe4a/RootCA.pem" data-canonical-src="/uploads/2eef74ceb38fe45241449d368ea4fe4a/RootCA.pem" data-link="true" class="gfm">RootCA.pem</a>
</li>
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<a href="#actual-results" aria-hidden="true" class="anchor" id="user-content-actual-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">Loaded CAs (1 available)</span>
<span id="LC2" class="line" lang="plaintext">Setting log level to 10</span>
<span id="LC3" class="line" lang="plaintext"> Subject: CN=www.mycompany1.com,OU=My Unit1,O=My Company1,L=MY Locality1,ST=My ST1,C=UN</span>
<span id="LC4" class="line" lang="plaintext"> Issuer: CN=www.mycompany.com,OU=My Unit1,O=My Company1,L=MY Locality1,ST=My ST1,C=UN</span>
<span id="LC5" class="line" lang="plaintext"> Checked against: CN=www.mycompany.com,OU=My Unit1,O=My Company1,L=MY Locality1,ST=My ST1,C=UN</span>
<span id="LC6" class="line" lang="plaintext"> Signature algorithm: RSA-SHA256</span>
<span id="LC7" class="line" lang="plaintext"> Output: Verified. The certificate is trusted. </span>
<span id="LC8" class="line" lang="plaintext">Chain verification output: Verified. The certificate is trusted. </span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<h2 dir="auto" style="margin-top: 1.5rem; margin-bottom: 1rem; border-bottom-style: solid; border-bottom-color: #dcdcde; font-weight: 600; font-size: 1.3125rem; letter-spacing: -0.01em; line-height: 1.25; color: #18171d; border-bottom-width: 1px; padding-bottom: 0.25rem;" align="initial">
<a href="#expected-results" aria-hidden="true" class="anchor" id="user-content-expected-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Consistent verification results among GnuTLS and other TLS implementations.
OpenSSL：error 34 at 0 depth lookup: unhandled critical extension
WolfSSL:wolfSSL_CertManagerVerify failed with return code -160 and error message X.509 Critical extension ignored or invalid</p>
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