[gnutls-devel] GnuTLS | x509: reject certificates having duplicate extensions (!1145)

[Development of GNU's TLS library]

Nikos Mavrogiannopoulos created a merge request: https://gitlab.com/gnutls/gnutls/merge_requests/1145

Project:Branches: nmav/gnutls:tmp-check-dup-extensions to gnutls/gnutls:master
Author:    Nikos Mavrogiannopoulos



According to RFC5280 a certificate must not include more than one instance of a particular extension. We were previously printing warnings when such extensions were found, but that is insufficient to flag such certificates. Instead, refuse to import them.
    
## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [x] Documentation updated / NEWS entry present (for non-trivial changes)
 * [x] 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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