[gnutls-devel] GnuTLS | p11-kit-trust: investigate whether CKA_NSS_{SERVER, EMAIL}_DISTRUST_AFTER can be used (#912)

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Daiki Ueno commented:


The expected behavior is precisely documented at https://wiki.mozilla.org/CA/Additional_Trust_Changes#Distrust_After:

> For some root certificates Mozilla has set 'Distrust for TLS After Date' or 'Distrust for S/MIME After Date'. For certificates chaining up to those root certificates, Mozilla does not trust end-entity certificates that have a Valid-From date later than the specified distrust-after date. Certificates with a Valid-From date earlier than the distrust-after date will continue to be trusted until the certificate's natural expiration or until the certificate is revoked.

I guess that would translate to:
- obtain any CKA_NSS_SERVER_DISTRUST_AFTER attribute when retrieving issuer certificate (maybe store it in a private field of `struct gnutls_x509_crt_int`)
- compare issuer's distrust-after date with the one retrieved with `gnutls_x509_crt_get_activation_time`

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