[gnutls-devel] GnuTLS | Handle expiration of AddTrust root certificate (urgent) (#1008)

[Development of GNU's TLS library]

Michael Catanzaro commented on a discussion: https://gitlab.com/gnutls/gnutls/-/issues/1008#note_352481491

> GnuTLS implements the [Basic Path Validation procedure](https://tools.ietf.org/html/rfc5280#section-6.1) quite naively, meaning that it assumes that the `n`th certificate is signed by `n-1`th, and individual certificate validity is only checked at the [Basic Certificate Processing phase](https://tools.ietf.org/html/rfc5280#section-6.1.3).

We have tests in glib-networking to ensure that unordered chains are accepted (they are). (Though it's possible that glib-net attempts to reorder the chain before passing to GnuTLS.)

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