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romanett 5572107ab8 Push Model compliance: UpdateCertificate issuer check, TrustList audit events, NoConfiguration state, DefaultHttpsGroup (#4684)
# Description

Fixes found by a manual run of the OPC 10000-12 *Push Model for Global
Certificate and TrustList Management* test plan (183 test cases,
TC0–TC182) against the Reference Server. After these changes no test
case fails; the remaining non-pass verdicts are test-plan expectations
that contradict Part 12/Part 4/Part 20 (documented in the run report).

### Server behaviour changes

- **UpdateCertificate requires the issuer in the TrustList**
(`ConfigurationNodeManager.PushValidation.cs`). The validator classifies
an incomplete chain as suppressible; OPC 10000-4 Table 100 does not ("An
error during the chain creation may not be suppressed") and §7.10.5
requires the issuers to already be in the group's TrustList. A
certificate of an unknown CA is now rejected with
`Bad_CertificateChainIncomplete`. Expiry / host-name errors stay ignored
as §7.10.5 requires.
- **TrustList audit events reach the Server Object.**
`TrustListUpdateRequested`/`TrustListUpdated` were reported on the
TrustList node (`EventNotifier=0`, not linked to the Server), so no
client could receive them. `TrustList.SetAuditEventServer` routes them
through `IAuditEventServer`; wired for the Push TrustLists and the GDS
CertificateGroup TrustLists. New `AuditEvents` overloads keep the
node-based ones.
- **Duplicate AddCertificate** no longer makes the following
ApplyChanges fail with a bare `Bad` (store refused the second copy); the
commit is idempotent and its rollback keeps the pre-existing
certificate.
- **CloseAndUpdate validates CRLs** (incl. CRL-only updates): every CRL
must be signed by a CA of the new TrustList (§7.8.2.5). Previously an
unknown/forged CRL passed CloseAndUpdate and only failed ApplyChanges.
- **X.509 v1 certificates are rejected** by
CloseAndUpdate/AddCertificate/UpdateCertificate (OPC 10000-6 §6.2.2; new
`X509Utils.IsX509Version3`).
- **Application setup state (Annex G.2):** new
`StandardServer.StartupServerState` (virtual); the DI host returns
`NoConfiguration` when `ServerConfigurationOptions.InApplicationSetup ==
true`. `IsRunning` and `NodeManagerLifecycle` treat `NoConfiguration` as
operational. The Reference Server `--provision` mode starts in
`NoConfiguration` and exposes `InApplicationSetup=TRUE`.
- **DefaultHttpsGroup:** the group is only created when Https stores are
configured — the Reference Server config had none, so its
`opc.https`/`opc.wss` endpoints used the RSA application certificate
with an empty TLS trust list and the Https certificate could not be
pushed. The sample config now declares
`HttpsIssuerCertificates`/`TrustedHttpsCertificates` and an
`HttpsCertificateType` certificate (new `CertificateTypeString` value
`Https`). An Https certificate is assigned to DefaultHttpsGroup only (no
longer also listed in DefaultApplicationGroup). Fixed
`AddSecurityConfigurationHttpsStore`, which built the trusted Https
store path from the store *type*.
- Minor: AddCertificate logs a warning when it adds a CA without a CRL
while `RejectUnknownRevocationStatus` is enabled; UpdateCertificate
refused for an insufficient SecureChannel raises
`CertificateUpdateRequestedAuditEvent` with Status=false.

### Kept on purpose
- PEM certificates are accepted (converted to DER).
- `Bad_NotWritable` when opening an already open TrustList (OPC 10000-20
§4.2.2) and for AddCertificate while a read handle is open (§7.8.2.6).
- No validation rules for DefaultUserTokenGroup / DefaultHttpsGroup
TrustLists (Part 12 defines them only for ApplicationCertificateType
groups).

### Notes for reviewers
- Existing tests in `ConfigurationNodeManagerPushTests` and
`PushCertificateRequestRegressionTests` signed pushed certificates with
CAs that were not in the TrustList; they now trust their CA first
(behaviour change above).
- Adding the Https certificate to
`Quickstarts.ReferenceServer.Config.xml` gives the Reference Server's
opc.https/opc.wss endpoints their own TLS certificate.

### Tests
-
`tests/Opc.Ua.Server.Tests/Configuration/PushComplianceRegressionTests.cs`
— duplicate add/rollback, PEM, v1/v3, CRL issuer/forged/CRL-only, audit
routing.
- `tests/Opc.Ua.Server.Tests/ApplicationSetupServerStateTests.cs` —
NoConfiguration startup state.
- `tests/Opc.Ua.Gds.Tests/PushComplianceTests.cs` — end-to-end over a
secure channel: TrustList transaction lifecycle, open-handle rules,
masked reads, duplicate/PEM add, unknown CRL issuer, unknown certificate
issuer, cross-Session CSR key, nonce rules, RemoveCertificate chain/CRL
handling. Mutation-checked: reverting the issuer, duplicate-add and CRL
fixes makes the corresponding tests fail.
- Additional cases in `PushCertificateRequestRegressionTests`,
`CertificateIdentifierTests`, `ApplicationConfigurationBuilderTests`.

Local runs (net10.0): Opc.Ua.Gds.Tests 1257 passed / 0 failed / 56
skipped; Opc.Ua.Server.Tests push/TrustList/audit/lifecycle subset 1209
passed; Core and Configuration test classes passed. net48 build of the
affected test projects succeeds; `dotnet format whitespace` clean.

## Related Issues

- None (findings from a manual Push Model compliance run).

## Checklist

- [x] I have signed the
[CLA](https://opcfoundation.org/license/cla/ContributorLicenseAgreementv1.0.pdf)
and read the
[CONTRIBUTING](https://github.com/OPCFoundation/UA-.NETStandard/blob/master/CONTRIBUTING.md)
doc.
- [x] I have added tests that prove my fix is effective or that my
feature works and increased code coverage.
- [ ] I have added all necessary documentation.
- [x] I have verified that my changes do not introduce (new) build or
analyzer warnings.
- [ ] I ran **all** tests locally using the **UA.slnx** solution against
at least .net **framework** and .net **10**, and all passed.
- [ ] I fixed **all** failing and flaky tests in the CI pipelines and
**all** CodeQL warnings.
- [ ] I have addressed **all** PR feedback received.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-06 18:48:02 +00:00

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XML

<?xml version="1.0" encoding="utf-8"?>
<ApplicationConfiguration
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ua="http://opcfoundation.org/UA/2008/02/Types.xsd"
xmlns="http://opcfoundation.org/UA/SDK/Configuration.xsd"
>
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<CertificateTypeString>RsaSha256</CertificateTypeString>
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<!-- Where the trust list is stored -->
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<!-- WARNING: The following setting (to automatically accept untrusted certificates) should be used
for easy debugging purposes ONLY and turned off for production deployments! -->
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<!-- WARNING: SHA1 signed certificates are by default rejected and should be phased out.
only nano and embedded profiles are allowed to use sha1 signed certificates. -->
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<!-- Where the User trust list is stored-->
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<StoreType>Directory</StoreType>
<StorePath>%LocalApplicationData%/OPC Foundation/pki/trustedUser</StorePath>
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<!-- Where the Https issuer certificates are stored -->
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<StorePath>%LocalApplicationData%/OPC Foundation/pki/issuerHttps</StorePath>
</HttpsIssuerCertificates>
<!-- Where the Https trust list (TLS client certificates) is stored -->
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<ua:String>opc.wss://localhost:62543/Quickstarts/ReferenceServer</ua:String>
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<!--
These list the alternate addresses (via firewalls, multiple NICs etc.) that can be
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FindServers/GetEndpoints or CreateSession will be used to filter the list of
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that matches the domain in the url provided by the client.
Note that any additional domains should be listed in the server's certificate. If they
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alternate domain was authorized by the server administrator.
-->
<!--
<AlternateBaseAddresses>
<ua:String>opc.tcp://AlternateHostName/Quickstarts/ReferenceServer</ua:String>
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<!-- The SDK expects the server to support the same set of user tokens for every endpoint. -->
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<!-- Allows anonymous users -->
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<!-- <ua:SecurityPolicyUri>http://opcfoundation.org/UA/SecurityPolicy#None</ua:SecurityPolicyUri> -->
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<!-- passwords must be encrypted - this specifies what algorithm to use -->
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<!-- certificate possession must be proven with a digital signature - this specifies what algorithm to use -->
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<DiagnosticsEnabled>true</DiagnosticsEnabled>
<!-- Settings for CTT testing -->
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<MaxChannelCount>1000</MaxChannelCount>
<MinSessionTimeout>10000</MinSessionTimeout>
<MaxSessionTimeout>3600000</MaxSessionTimeout>
<MaxBrowseContinuationPoints>10</MaxBrowseContinuationPoints>
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<MaxHistoryContinuationPoints>100</MaxHistoryContinuationPoints>
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<MaxPublishingInterval>3600000</MaxPublishingInterval>
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<MaxSubscriptionLifetime>3600000</MaxSubscriptionLifetime>
<MaxMessageQueueSize>100</MaxMessageQueueSize>
<MaxNotificationQueueSize>100</MaxNotificationQueueSize>
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<!-- The minimum sampling interval the server supports. 0 means the server does not
impose a server wide lower bound on the revised sampling interval. The value is
published in Server.ServerCapabilities.MinSupportedSampleRate. -->
<MinSupportedSamplingInterval>0</MinSupportedSamplingInterval>
<AvailableSamplingRates>
<SamplingRateGroup>
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<Increment>1</Increment>
<Count>10</Count>
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<SamplingRateGroup>
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<Increment>10</Increment>
<Count>9</Count>
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<SamplingRateGroup>
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<Count>4</Count>
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<SamplingRateGroup>
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<RegistrationEndpoint>
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<ua:Server>
<ua:ApplicationUri>opc.tcp://localhost:4840</ua:ApplicationUri>
<ua:ApplicationType>DiscoveryServer_3</ua:ApplicationType>
<ua:DiscoveryUrls>
<ua:String>opc.tcp://localhost:4840</ua:String>
</ua:DiscoveryUrls>
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<ua:SecurityMode>SignAndEncrypt_3</ua:SecurityMode>
<ua:SecurityPolicyUri />
<ua:UserIdentityTokens />
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<NodeManagerSaveFile>Quickstarts.ReferenceServer.nodes.xml</NodeManagerSaveFile>
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<ua:String>HD</ua:String>
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<ua:String>GDS</ua:String>
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<ua:String>PEM</ua:String>
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<!-- Reverse connection parameters for aggregation server sample -->
<!--
<ReverseConnect>
<Clients>
<ReverseConnectClient>
<EndpointUrl>opc.tcp://localhost:65300</EndpointUrl>
<MaxSessionCount>0</MaxSessionCount>
<Enabled>true</Enabled>
</ReverseConnectClient>
</Clients>
<ConnectInterval>15000</ConnectInterval>
<ConnectTimeout>30000</ConnectTimeout>
<RejectTimeout>60000</RejectTimeout>
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-->
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<MaxNodesPerBrowse>2500</MaxNodesPerBrowse>
<MaxNodesPerRegisterNodes>2500</MaxNodesPerRegisterNodes>
<MaxNodesPerTranslateBrowsePathsToNodeIds>2500</MaxNodesPerTranslateBrowsePathsToNodeIds>
<MaxNodesPerNodeManagement>2500</MaxNodesPerNodeManagement>
<MaxMonitoredItemsPerCall>2500</MaxMonitoredItemsPerCall>
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<AuditingEnabled>true</AuditingEnabled>
<HttpsMutualTls>true</HttpsMutualTls>
<DurableSubscriptionsEnabled>true</DurableSubscriptionsEnabled>
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<CertificateGroups>
<CertificateGroupConfiguration>
<Id>Default</Id>
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<ua:String>EccNistP384ApplicationCertificateType</ua:String>
<ua:String>EccBrainpoolP256r1ApplicationCertificateType</ua:String>
<ua:String>EccBrainpoolP384r1ApplicationCertificateType</ua:String>
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<SubjectName>CN=Reference Server CA, O=OPC Foundation</SubjectName>
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<DefaultCertificateLifetime>12</DefaultCertificateLifetime>
<DefaultCertificateKeySize>2048</DefaultCertificateKeySize>
<DefaultCertificateHashSize>256</DefaultCertificateHashSize>
<CACertificateLifetime>60</CACertificateLifetime>
<CACertificateKeySize>4096</CACertificateKeySize>
<CACertificateHashSize>512</CACertificateHashSize>
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<KnownHostNames />
<DatabaseStorePath></DatabaseStorePath>
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</ua:XmlElement>
<ua:XmlElement>
<MemoryBufferConfiguration xmlns="http://samples.org/UA/MemoryBuffer">
<Buffers>
<MemoryBufferInstance>
<Name>UInt32</Name>
<TagCount>100</TagCount>
<DataType>UInt32</DataType>
</MemoryBufferInstance>
<MemoryBufferInstance>
<Name>Double</Name>
<TagCount>100</TagCount>
<DataType>Double</DataType>
</MemoryBufferInstance>
</Buffers>
</MemoryBufferConfiguration>
</ua:XmlElement>
</Extensions>
<TraceConfiguration>
<OutputFilePath>./Logs/Quickstarts.ReferenceServer.log.txt</OutputFilePath>
<DeleteOnLoad>true</DeleteOnLoad>
<!-- Show Only Errors -->
<!-- <TraceMasks>1</TraceMasks> -->
<!-- Show Only Security and Errors -->
<!-- <TraceMasks>513</TraceMasks> -->
<!-- Show Only Security, Errors and Trace -->
<!-- <TraceMasks>515</TraceMasks> -->
<!-- Show Only Security, COM Calls, Errors and Trace -->
<!-- <TraceMasks>771</TraceMasks> -->
<!-- Show Only Security, Service Calls, Errors and Trace -->
<!-- <TraceMasks>523</TraceMasks> -->
<!-- Show Only Security, ServiceResultExceptions, Errors and Trace -->
<TraceMasks>519</TraceMasks>
</TraceConfiguration>
</ApplicationConfiguration>