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[6.1.8 Cherry-pick] Honor HostNameInCertificate in managed SNI certificate validation - #4909
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🟡 Changes recommended
Test compilation incompatibilities and missing integration-test registration must be resolved before the backport can be validated.
4 open issues
What changed in this PR
Backports #4905 to release/6.1, making managed SNI enforce an explicitly configured HostNameInCertificate as the expected certificate hostname without changing the connection destination.
Changes:
- Enforces configured hostname validation while preserving certificate-chain checks and certificate-pin precedence.
- Adds direct validation, loopback TLS, and conditional SQL Server regression tests.
- Clarifies the property’s hostname-selection behavior.
| File | Description |
|---|---|
src/Microsoft.Data.SqlClient/tests/UnitTests/Microsoft/Data/SqlClient/ManagedSni/SniCommonValidateSslServerCertificateTest.cs |
Adds hostname, chain, pin, and loopback TLS coverage. |
src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/HostNameInCertificateTest.cs |
Adds conditional Open and OpenAsync regression cases. |
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniCommon.netcore.cs |
Checks explicit hostnames even when platform validation succeeds. |
doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml |
Documents explicit hostname precedence. |
Review effort: Balanced
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Use the .NET 8 certificate import fallback and branch-compatible nullable annotations. Register the manual hostname test in set 1 and construct connections using the release-branch API. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d02b81a2-8d04-492b-8fc8-66d4dbb020f5
apoorvdeshmukh
previously approved these changes
Oct 26, 2026
priyankatiwari08
enabled auto-merge (squash)
October 26, 2026 07:42
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/azp run |
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Azure Pipelines: Successfully started running 2 pipeline(s). 3 pipeline(s) were filtered out due to trigger conditions. |
Declare serverAuth EKU and RSA TLS key usages for platform certificate policy compatibility. Keep the loopback handshake theory enabled on macOS. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d02b81a2-8d04-492b-8fc8-66d4dbb020f5
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/azp run |
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/azp run |
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Azure Pipelines: Successfully started running 2 pipeline(s). 3 pipeline(s) were filtered out due to trigger conditions. |
apoorvdeshmukh
previously approved these changes
Oct 26, 2026
Retain serverAuth EKU while removing leaf-only KeyUsage that causes OpenSSL chain errors for the self-signed custom trust anchor. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d02b81a2-8d04-492b-8fc8-66d4dbb020f5
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/azp run |
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Azure Pipelines: Successfully started running 2 pipeline(s). 3 pipeline(s) were filtered out due to trigger conditions. |
paulmedynski
approved these changes
Oct 26, 2026
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This was referenced Nov 3, 2026
Bump Microsoft.Data.SqlClient from 6.1.7 to 7.1.1
broleks/blazorNETprojectstarterwithauthorization#6
Closed
This was referenced Nov 10, 2026
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Cherry-pick of #4905 (7c55ed0) into
release/6.1.