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Honor HostNameInCertificate in managed SNI certificate validation - #4905
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c
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🔵 Needs a closer look
This security-sensitive change needs human confirmation because reported TLS execution covers Windows only and SQL Server integration coverage was skipped.
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What changed in this PR
Updates managed SNI to enforce an explicitly configured HostNameInCertificate as the sole expected certificate hostname, without changing the connection destination or TLS routing.
Changes:
- Checks explicit hostnames even when platform certificate validation reports no errors, while preserving chain checks and certificate-pin precedence.
- Adds helper-level, loopback TLS, and conditional synchronous/asynchronous SQL Server regression coverage.
- Clarifies the property’s hostname-override behavior in API documentation.
| File | Description |
|---|---|
| src/Microsoft.Data.SqlClient/tests/UnitTests/Microsoft/Data/SqlClient/ManagedSni/SniCommonValidateSslServerCertificateTest.cs | Adds hostname, chain-error, pin-precedence, and loopback TLS tests. |
| src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectionTestWithSSLCert/HostNameInCertificateTest.cs | Adds conditional hostname-rejection tests for Open and OpenAsync. |
| src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/ManagedSni/SniCommon.netcore.cs | Enforces explicit certificate hostnames and handles missing certificates. |
| doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml | Documents explicit hostname precedence without destination changes. |
Review effort: Balanced
Codecov Report✅ All modified and coverable lines are covered by tests.
Additional details and impacted files@@ Coverage Diff @@
## main #4905 +/- ##
==========================================
- Coverage 72.40% 65.80% -6.61%
==========================================
Files 292 286 -6
Lines 45471 68626 +23155
==========================================
+ Hits 32924 45158 +12234
- Misses 12547 23468 +10921
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benrr101
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Oct 22, 2026
cheenamalhotra
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Oct 22, 2026
cheenamalhotra
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Hotfix 7.0.5
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…icate validation (#4909) * Honor HostNameInCertificate in managed SNI certificate validation (#4905) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c * Fix certificate validation test compatibility in 6.1 backport 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 --------- Co-authored-by: Apoorv Deshmukh <apdeshmukh@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Co-authored-by: Priyanka Tiwari <prtiwar@microsoft.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c Copilot-Session: d02b81a2-8d04-492b-8fc8-66d4dbb020f5
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Closed
This was referenced Nov 6, 2026
Bump Microsoft.Data.SqlClient from 6.1.7 to 7.1.1
broleks/blazorNETprojectstarterwithauthorization#6
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- Guard X509CertificateLoader with NET9_0_OR_GREATER; net8 uses Microsoft.Bcl.Cryptography 8.0.0, which lacks it. - Use new SqlConnection(...) since DataTestUtility.CreateConnection does not exist on release/7.1. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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) (#4908) Co-authored-by: Apoorv Deshmukh <apdeshmukh@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c
cheenamalhotra
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…icate validation (#4907) * Honor HostNameInCertificate in managed SNI certificate validation (#4905) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c * Adapt #4905 port tests for release/7.1 - Guard X509CertificateLoader with NET9_0_OR_GREATER; net8 uses Microsoft.Bcl.Cryptography 8.0.0, which lacks it. - Use new SqlConnection(...) since DataTestUtility.CreateConnection does not exist on release/7.1. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Apoorv Deshmukh <apdeshmukh@microsoft.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 18415205-5120-4f0e-9815-f2325898516c
This was referenced Nov 10, 2026
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Description
Updates managed SNI to use
HostNameInCertificateas the sole expected certificate hostname when explicitly configured. During certificate hostname validation, certificates that do not match the configured name are rejected.Preserves default hostname selection when the property is unset, certificate-chain checks, and existing
ServerCertificatematching behavior. The connection destination and TLS routing are unchanged. No public API signatures or localized resources are added or changed.Clarifies the
HostNameInCertificateproperty documentation and adds regression coverage.Issues
N/A.
Testing
OpenandOpenAsync.Validation commands and completion status
dotnet build build.proj -t:TestSqlClientUnit -p:TestFramework=net10.0 '-p:TestFilters=FullyQualifiedName~SniCommonValidateSslServerCertificateTest' -verbosity:quiet— passed, 33 tests.dotnet build 'src\Microsoft.Data.SqlClient\src\Microsoft.Data.SqlClient.csproj' --framework net462 --verbosity quiet— passed.& '.\eng\pipelines\onebranch\scripts\validate-xml-docs.ps1' -SnippetsDirectory '.\doc\snippets'— passed.dotnet build build.proj -t:TestSqlClientManual -p:TestFramework=net10.0 '-p:TestFilters=FullyQualifiedName~HostNameInCertificateTest' -verbosity:quiet— project compiled; conditional integration test skipped becauseIsCertificateValidationConfiguredwas not satisfied. The build target reported failure from SQL connection-timeout diagnostics during test initialization.Tests added or updated.
Public API behavior documented; no signature changes.
Verified against customer repro (not run).
Ensure no breaking changes introduced: configured HNIC is now enforced as documented; other certificate-validation behavior is preserved.
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