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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented:
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<p dir="auto">Thank you for the report. Though I am not following the discussion around this, my question is whether it is legitimate that the server sends such certificate chain. GnuTLS implements the <a href="https://tools.ietf.org/html/rfc5280#section-6.1" rel="nofollow noreferrer noopener" target="_blank">Basic Path Validation procedure</a> quite naively, meaning that it assumes that the <code>n</code>th certificate is signed by <code>n-1</code>th, and individual certificate validity is only checked at the <a href="https://tools.ietf.org/html/rfc5280#section-6.1.3" rel="nofollow noreferrer noopener" target="_blank">Basic Certificate Processing phase</a>.</p>
<p dir="auto">Having said that, there is a pre-processing mechanism and it wouldn't be so hard to "fix" this (I confirmed that it works if I add an extra check in <code>_gnutls_sort_clist</code>, though I guess the behavior should probably be controlled with a flag, like unsorted chain).</p>
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