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<a href="https://gitlab.com/jlduprat">Jean-Luc Duprat</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1521">#1521</a>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 0 0 16px;" align="initial">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Cockpit (which uses gnuTLS) rejects certificate chain with distributed trust.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">The provided certificate file contains the certificate C for the TLS endpoint, followed by 3 chains of trust (Interm 2A, Interm 1A, Root A). The three roots cross-signed each other.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Chain looks like so in PEM format:
C
Interm 2A
Interm 1A
Interm 2B
Interm 1B
Interm 2C
Interm 1C
KeyRootA_SignedB
KeyRootA_SignedC
KeyRootB_SignedA
KeyRootB_SignedC
KeyRootC_SignedA
KeyRootC_SignedB
Root A
Root B
Root C</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This is not a public chain.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true" 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: #333238; margin: 0 0 16px;" align="initial">gnutls-3.8.2-2.fc39.x86_64</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true" 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: #333238; margin: 0 0 16px;" align="initial">Fedora 39</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Steps to Reproduce:
If I run (checks the certificates that will be used by cockpit):
$ sudo /usr/libexec/cockpit-certificate-ensure --check
with the above chain, I get the following error from gnuTLS
cockpit-certificate-ensure: ../../../lib/x509/common.c:1756: _gnutls_sort_clist: Assertion `k == clist_size' failed.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">If I delete the cross-signed certifications of the roots from the chain, i.e.:
RootA_SignedB
RootA_SignedC
RootB_SignedA
RootB_SignedC
RootC_SignedA
RootC_SignedB</p>
<p dir="auto" style="color: #333238; margin: 0;" align="initial">then there is no error. Sorting this list of certificates should not cause an assertion.</p>
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