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* feat: support mTLS-only authn/authz with AccessControl and allow combining mTLS with other auth mechanisms Signed-off-by: Ivan Arkhipov <me@endevir.ru> * refactor: improve authentication logic and TLS certificate generation - Fix mTLS authentication to use only leaf certificate instead of iterating through all certificates in the chain - Reject Authorization headers when corresponding auth method is disabled, regardless of mTLS status (security improvement) - Simplify authentication switch statement ordering and logic - Move ErrUserDataNotFound error handling into sessionAuthn method - Refactor TLS certificate generation to use Options pattern with CertificateOptions struct for better extensibility - Consolidate duplicate certificate generation code into helper functions (generateCertificate, parseCA, initializeTemplate, applyOptions) - Rename certificate generation functions for clarity: - GenerateCertWithCN -> GenerateClientCert - GenerateSelfSignedCertWithCN -> GenerateClientSelfSignedCert - Add support for SAN settings including email addresses in certificates - Update tests to reflect new authentication behavior and certificate API This commit improves both the security posture (rejecting disabled auth methods) and code maintainability (consolidated certificate generation). Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com> * fix: guard against multiple Authorization headers Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com> --------- Signed-off-by: Ivan Arkhipov <me@endevir.ru> Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com> Co-authored-by: Ivan Arkhipov <me@endevir.ru>