[6.1.7 Cherry-pick] Fix | Perform ServerCertificate pin validation to verify with server provided cert - #4584
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…provided cert (#4445) * Server Certificate validation changes * Address comments * Address review feedback: reorder pin check after policy checks - Perform ServerCertificate pin validation after chain/name policy error handling, making the additive semantics explicit in control flow. - Extract ValidateCertificatePin/LoadValidationCertificate helpers so the loaded pin certificate lives in a narrow 'using' scope (no try/finally). - Guard against a null server certificate in the pin path. - Clarify method docs on the policyErrors relationship and reword the no-pin fast-path trace message. - Replace ambiguous 'platform trust' wording in docs with chain-and-name validation, and note that pinning does not itself confer trust. - Add TempCertFile disposable test helper and a null-server-cert regression test for the policyErrors == None case. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> * Revert to minimal design: pin always consulted, fail closed on load error Restores the original semantic where an exact ServerCertificate match satisfies certificate validation. The only behavior changes remain: - The policyErrors == None fast path now also requires that no ServerCertificate was supplied, so a configured certificate is always compared against the one presented by the server. - A ServerCertificate that cannot be loaded/parsed now fails the connection instead of being silently ignored. Also keeps the non-design fixes: the loaded certificate is disposed via a narrow using scope, and a null server certificate throws AuthenticationException instead of NullReferenceException. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> * Address review: dedicated string, RemoteCertificateNotAvailable guard, safe Dispose - Add SQL_ServerCertificateNotAvailable so the failure names the option in play rather than reusing the generic policy-error text. - A matching ServerCertificate no longer satisfies validation when RemoteCertificateNotAvailable is reported. The flag and a null serverCert are expected to agree, but both are now checked so the contradictory combination cannot be accepted via comparison. Documented the relationship on the method. - Guard TempCertFile.Dispose so a cleanup failure cannot mask a real assertion failure. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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paulmedynski
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August 24, 2026 17:06
paulmedynski
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Aug 24, 2026
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benrr101
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Aug 24, 2026
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Cherry-pick of #4445 (8acf068) into
release/6.1.