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<a href="https://gitlab.com/paulmenzel">Paul Menzel</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1455">#1455</a>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Using self-built GnuTLS 3.7.8, it’s unable to verify <a href="http://www.netfilter.org" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">www.netfilter.org</a> (or iptables.org).</p>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">$ gnutls-cli --version</span>
<span id="LC2" class="line" lang="plaintext">gnutls-cli 3.7.8</span>
<span id="LC3" class="line" lang="plaintext">[…]</span>
<span id="LC4" class="line" lang="plaintext">$ gnutls-cli www.netfilter.org</span>
<span id="LC5" class="line" lang="plaintext">Processed 142 CA certificate(s).</span>
<span id="LC6" class="line" lang="plaintext">Resolving 'www.netfilter.org:443'...</span>
<span id="LC7" class="line" lang="plaintext">Connecting to '92.243.18.11:443'...</span>
<span id="LC8" class="line" lang="plaintext">- Certificate type: X.509</span>
<span id="LC9" class="line" lang="plaintext">- Got a certificate list of 4 certificates.</span>
<span id="LC10" class="line" lang="plaintext">- Certificate[0] info:</span>
<span id="LC11" class="line" lang="plaintext"> - subject `CN=iptables.org', issuer `CN=R3,O=Let's Encrypt,C=US', serial 0x04675191b85af1eea91388782cc5a2e1258c, RSA key 2048 bits, signed using RSA-SHA256, activated `2023-01-06 22:33:05 UTC', expires `2023-04-06 22:33:04 UTC', pin-sha256="+uWS05Cq49ezAdUve1eMV+fAqtOqSVI1kPr0UM9mxGE="</span>
<span id="LC12" class="line" lang="plaintext"> Public Key ID:</span>
<span id="LC13" class="line" lang="plaintext"> sha1:138a74de0999cbecdbfda39e88f372307a2e4ee8</span>
<span id="LC14" class="line" lang="plaintext"> sha256:fae592d390aae3d7b301d52f7b578c57e7c0aad3aa49523590faf450cf66c461</span>
<span id="LC15" class="line" lang="plaintext"> Public Key PIN:</span>
<span id="LC16" class="line" lang="plaintext"> pin-sha256:+uWS05Cq49ezAdUve1eMV+fAqtOqSVI1kPr0UM9mxGE=</span>
<span id="LC17" class="line" lang="plaintext"></span>
<span id="LC18" class="line" lang="plaintext">- Certificate[1] info:</span>
<span id="LC19" class="line" lang="plaintext"> - subject `CN=iptables.org', issuer `CN=R3,O=Let's Encrypt,C=US', serial 0x04675191b85af1eea91388782cc5a2e1258c, RSA key 2048 bits, signed using RSA-SHA256, activated `2023-01-06 22:33:05 UTC', expires `2023-04-06 22:33:04 UTC', pin-sha256="+uWS05Cq49ezAdUve1eMV+fAqtOqSVI1kPr0UM9mxGE="</span>
<span id="LC20" class="line" lang="plaintext">- Certificate[2] info:</span>
<span id="LC21" class="line" lang="plaintext"> - subject `CN=R3,O=Let's Encrypt,C=US', issuer `CN=ISRG Root X1,O=Internet Security Research Group,C=US', serial 0x00912b084acf0c18a753f6d62e25a75f5a, RSA key 2048 bits, signed using RSA-SHA256, activated `2020-09-04 00:00:00 UTC', expires `2025-09-15 16:00:00 UTC', pin-sha256="jQJTbIh0grw0/1TkHSumWb+Fs0Ggogr621gT3PvPKG0="</span>
<span id="LC22" class="line" lang="plaintext">- Certificate[3] info:</span>
<span id="LC23" class="line" lang="plaintext"> - subject `CN=ISRG Root X1,O=Internet Security Research Group,C=US', issuer `CN=DST Root CA X3,O=Digital Signature Trust Co.', serial 0x4001772137d4e942b8ee76aa3c640ab7, RSA key 4096 bits, signed using RSA-SHA256, activated `2021-01-20 19:14:03 UTC', expires `2024-09-30 18:14:03 UTC', pin-sha256="C5+lpZ7tcVwmwQIMcRtPbsQtWLABXhQzejna0wHFr8M="</span>
<span id="LC24" class="line" lang="plaintext">- Status: The certificate is NOT trusted. The certificate issuer is unknown. </span>
<span id="LC25" class="line" lang="plaintext">*** PKI verification of server certificate failed...</span>
<span id="LC26" class="line" lang="plaintext">*** Fatal error: Error in the certificate.</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">strace shows that it’s parsing <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>/etc/ssl/certs/ca-certificates.crt</code></p>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">openat(AT_FDCWD, "/etc/ssl/certs/ca-certificates.crt", O_RDONLY|O_CLOEXEC) = 3</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">pointing to <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>/etc/ssl/ca-bundle.crt</code>.</p>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">$ ls -lh /etc/ssl/certs/ca-certificates.crt</span>
<span id="LC2" class="line" lang="plaintext">lrwxrwxrwx 1 root root 22 Jun 17 2014 /etc/ssl/certs/ca-certificates.crt -> /etc/ssl/ca-bundle.crt</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">That file contains</p>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">Issuer: C = US, O = Internet Security Research Group, CN = ISRG Root X1</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">but not the listed issuer <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>CN=DST Root CA X3,O=Digital Signature Trust Co.</code>.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">The certificates are retrieved from <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>https://curl.haxx.se/ca/cacert.pem</code>.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">For some reason it works in Debian sid/unstable with <em style="margin-top: 0;">gnutls-bin</em> 3.7.9-1.</p>
<p dir="auto" style="color: #333238; margin: 0;" align="initial">It might be related to <a href="https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">DST Root CA X3 Expiration (September 2021)</a>.</p>
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