[gnutls-devel] GnuTLS | pkcs11: respect CKA_NSS_SERVER_DISTRUST_AFTER upon issuer lookup (!1725)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1725

Project:Branches: dueno/gnutls:wip/dueno/distrust-after to gnutls/gnutls:master
Author:   Daiki Ueno




This implements the basic logic needed to support time-based distrust
of CA, according to [1], with a slight modification to optimize the
number of PKCS#11 queries: instead of checking the validity after
building a certificate chain, it uses the activation time of a
certificate as the search criteria for issuer certificates. When a
time-based distrust is detected, the search will exclude the issuer
from the results.

1. https://wiki.mozilla.org/CA/Additional_Trust_Changes#Distrust_After

Fixes: #912 

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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