[gnutls-devel] GnuTLS | tls: enable session tickets always in TLS 1.3 (!1475)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1475

Project:Branches: dueno/gnutls:wip/dueno/session-ticket-tls13-only to gnutls/gnutls:master
Author:   Daiki Ueno




The GNUTLS_NO_TICKETS flag and %NO_TICKETS priority string modifier
previously had effect even in TLS 1.3, while TLS 1.3 does not provide
any other means to resume sessions.  This change introduces a slight
incompatilibity with the previous behavior in TLS 1.2, where session
ticket support was re-enabled with
gnutls_session_ticket_enable_server(), though the library now
considers the contradiction between the options and API usage as a
configuration error.

Fixes: #477

## 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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