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<a href="https://gitlab.com/TheRealMichaelCatanzaro">Michael Catanzaro</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1771">#1771</a>
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<h2 id="user-content-description-of-problem" dir="auto" style="margin-top: 0; margin-bottom: 10px;" align="initial">Description of problem:<a href="#description-of-problem" aria-label="Link to heading 'Description of problem:'" data-heading-content="Description of problem:" class="anchor" style="margin-top: 0;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">GnuTLS fails to verify the certificate chain on app.usmobile.com:</p>
<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; background-color: inherit; border-radius: .25rem; 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;">$ gnutls-cli app.usmobile.com</span>
<span id="LC2" class="line" lang="plaintext">Processed 393 CA certificate(s).</span>
<span id="LC3" class="line" lang="plaintext">Resolving 'app.usmobile.com:443'...</span>
<span id="LC4" class="line" lang="plaintext">Connecting to '2606:4700::6812:667:443'...</span>
<span id="LC5" class="line" lang="plaintext">- Certificate type: X.509</span>
<span id="LC6" class="line" lang="plaintext">- Got a certificate list of 3 certificates.</span>
<span id="LC7" class="line" lang="plaintext">- Certificate[0] info:</span>
<span id="LC8" class="line" lang="plaintext"> - subject `CN=app.usmobile.com', issuer `CN=Cloudflare TLS Issuing ECC CA 3,O=SSL Corporation,C=US', serial 0x3d7fb41e831e456921073810e12e6290, EC/ECDSA key 256 bits, signed using ECDSA-SHA256, activated `2025-11-12 18:05:49 UTC', expires `2026-11-12 17:47:06 UTC', pin-sha256="70y5eLrafXTVMjbptBrllO9Mw8FW9c2xuofNXy0Qqkc="</span>
<span id="LC9" class="line" lang="plaintext"> Public Key ID:</span>
<span id="LC10" class="line" lang="plaintext"> sha1:edd8ffacf5be4501880ac4d61bb967f84583cb6f</span>
<span id="LC11" class="line" lang="plaintext"> sha256:ef4cb978bada7d74d53236e9b41ae594ef4cc3c156f5cdb1ba87cd5f2d10aa47</span>
<span id="LC12" class="line" lang="plaintext"> Public Key PIN:</span>
<span id="LC13" class="line" lang="plaintext"> pin-sha256:70y5eLrafXTVMjbptBrllO9Mw8FW9c2xuofNXy0Qqkc=</span>
<span id="LC14" class="line" lang="plaintext"></span>
<span id="LC15" class="line" lang="plaintext">- Certificate[1] info:</span>
<span id="LC16" class="line" lang="plaintext"> - subject `CN=Cloudflare TLS Issuing ECC CA 3,O=SSL Corporation,C=US', issuer `CN=SSL.com TLS Transit ECC CA R2,O=SSL Corporation,C=US', serial 0x31eee88afb87cd9ef8336604743f9b27, EC/ECDSA key 256 bits, signed using ECDSA-SHA384, activated `2025-05-29 19:49:45 UTC', expires `2035-05-27 19:49:44 UTC', pin-sha256="44viFzTC+h/L+3OHRg4Rs5v4+AcpzHZvI9Tne2RDNGk="</span>
<span id="LC17" class="line" lang="plaintext">- Certificate[2] info:</span>
<span id="LC18" class="line" lang="plaintext"> - subject `CN=SSL.com TLS Transit ECC CA R2,O=SSL Corporation,C=US', issuer `CN=AAA Certificate Services,O=Comodo CA Limited,L=Salford,ST=Greater Manchester,C=GB', serial 0x00ad8d2df64681a0d36447eaa94fa273c1, EC/ECDSA key 384 bits, signed using RSA-SHA256, activated `2024-06-21 00:00:00 UTC', expires `2028-12-31 23:59:59 UTC', pin-sha256="OXyj9ngbqO9cjLeO/+t9Ggl2EP4JTnVWHq4LEwhFM9w="</span>
<span id="LC19" class="line" lang="plaintext">- Status: The certificate is NOT trusted. The certificate issuer is unknown. </span>
<span id="LC20" class="line" lang="plaintext">*** PKI verification of server certificate failed...</span>
<span id="LC21" class="line" lang="plaintext">*** Fatal error: Error in the certificate.</span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">firefox-145.0.1-1.fc43 accepts this with no problems, so ideally GnuTLS would as well. OpenSSL notably does not accept it (I tested <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; 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: keep-all; padding: 0.125rem 0.25rem;'>openssl s_client -connect app.usmobile.com:443</code>), but OpenSSL is notoriously not very good at certification path building. <a href="https://www.ssllabs.com/ssltest/analyze.html?d=app.usmobile.com&s=2606%3a4700%3a0%3a0%3a0%3a0%3a6812%3a767" rel="nofollow noreferrer noopener" target="_blank">SSL Labs</a> proposes two possible valid certification paths, the second of which won't work by default with gnutls-cli because it requires downloading an intermediate certificate using AuthorityInformationAccess. But the first path probably ought to work? I wonder if there is some good reason to reject it?</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Daiki says this looks similar to <a href="https://gitlab.com/gnutls/gnutls/-/issues/1741" title="Certificate with duplicates in the chain is rejected" class="gfm gfm-issue" data-original="#1741" data-link="false" data-link-reference="false" data-issue="173972245" data-project="179611" data-iid="1741" data-namespace-path="gnutls/gnutls" data-project-path="gnutls/gnutls" data-issue-type="issue" data-container="body" data-placement="top" data-reference-type="issue" style="margin-top: 0;">#1741</a>, although notably that issue involves duplicate certs in the certification path, which is not the case here.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Here's the certificate chain, for posterity: <a href="https://gitlab.com/-/project/179611/uploads/8c2b53dff1008f1bea676cfb912b5b08/test.crt" data-canonical-src="/uploads/8c2b53dff1008f1bea676cfb912b5b08/test.crt" data-link="true" class="gfm" style="margin-top: 0;">test.crt</a></p>
<h2 id="user-content-version-of-gnutls-used-gnutls-3811-5fc43-with-ca-certificates-2025280_v90304-11fc43" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Version of gnutls used: gnutls-3.8.11-5.fc43 with ca-certificates-2025.2.80_v9.0.304-1.1.fc43:<a href="#version-of-gnutls-used-gnutls-3811-5fc43-with-ca-certificates-2025280_v90304-11fc43" aria-label="Link to heading 'Version of gnutls used: gnutls-3.8.11-5.fc43 with ca-certificates-2025.2.80_v9.0.304-1.1.fc43:'" data-heading-content="Version of gnutls used: gnutls-3.8.11-5.fc43 with ca-certificates-2025.2.80_v9.0.304-1.1.fc43:" class="anchor" style="margin-top: 0;"></a>
</h2>
<h2 id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel-fedora" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL): Fedora<a href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel-fedora" aria-label="Link to heading 'Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL): Fedora'" data-heading-content="Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL): Fedora" class="anchor" style="margin-top: 0;"></a>
</h2>
<h2 id="user-content-how-reproducible-always" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">How reproducible: Always<a href="#how-reproducible-always" aria-label="Link to heading 'How reproducible: Always'" data-heading-content="How reproducible: Always" class="anchor" style="margin-top: 0;"></a>
</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;"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; 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; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls-cli app.usmobile.com</code></li>
</ul>
<h2 id="user-content-actual-results" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Actual results:<a href="#actual-results" aria-label="Link to heading 'Actual results:'" data-heading-content="Actual results:" class="anchor" style="margin-top: 0;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Chain is rejected as untrusted</p>
<h2 id="user-content-expected-results" dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">Expected results:<a href="#expected-results" aria-label="Link to heading 'Expected results:'" data-heading-content="Expected results:" class="anchor" style="margin-top: 0;"></a>
</h2>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">Chain should probably(?) verify successfully</p>
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