docs(design): devex proposal for mTLS PoP on Managed Identity and FIC - #3832
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Add specification for mTLS Proof-of-Possession support in Microsoft.Identity.Web for Managed Identity and Federated Identity Credential.
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Implements devex spec #3832: - TokenAcquisition: chain WithMtlsProofOfPossession().WithAttestationSupport() on the pure-MI builder when ProtocolScheme=MTLS_POP. - ConfidentialClientApplicationBuilderExtension: dispatch FIC-with-MI to a bound-assertion delegate that returns ClientSignedAssertion (carrying both the JWT and the MI-minted binding certificate). All other signed-assertion source types still throw IDW10115 (preserved by regression test). - ManagedIdentityClientAssertion: new internal GetSignedAssertionWithBindingAsync that calls AcquireTokenForManagedIdentity(...).WithMtlsProofOfPossession() .WithAttestationSupport() and returns the bound assertion + cert pair. - Reference Microsoft.Identity.Client.KeyAttestation 4.84.1-preview. - IVT from Certificateless to TokenAcquisition (3rd entry in established file). - 2 new unit tests in WithClientCredentialsTests.cs (930 total pass, 0 fail). - 2 new daemon samples: daemon-app-msi-mtls, daemon-app-fic-mtls. No new public API surface. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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| ```json | ||
| { | ||
| "AzureKeyVault": { | ||
| "BaseUrl": "https://contoso.vault.azure.net/", |
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I assume the AKV url changes to an mtls specific endpoint?
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#3839) * Add MSI mTLS PoP support: pure MI + FIC-with-MI Implements devex spec #3832: - TokenAcquisition: chain WithMtlsProofOfPossession().WithAttestationSupport() on the pure-MI builder when ProtocolScheme=MTLS_POP. - ConfidentialClientApplicationBuilderExtension: dispatch FIC-with-MI to a bound-assertion delegate that returns ClientSignedAssertion (carrying both the JWT and the MI-minted binding certificate). All other signed-assertion source types still throw IDW10115 (preserved by regression test). - ManagedIdentityClientAssertion: new internal GetSignedAssertionWithBindingAsync that calls AcquireTokenForManagedIdentity(...).WithMtlsProofOfPossession() .WithAttestationSupport() and returns the bound assertion + cert pair. - Reference Microsoft.Identity.Client.KeyAttestation 4.84.1-preview. - IVT from Certificateless to TokenAcquisition (3rd entry in established file). - 2 new unit tests in WithClientCredentialsTests.cs (930 total pass, 0 fail). - 2 new daemon samples: daemon-app-msi-mtls, daemon-app-fic-mtls. No new public API surface. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Address review feedback: rename effectiveToken; bump KeyAttestation to GA 4.84.2 - Rename CancellationToken variable per cpp11nullptr review feedback to avoid confusion with OAuth/auth tokens (effectiveToken -> effectiveCancellationToken in GetSignedAssertionWithBindingAsync). - Bump Microsoft.Identity.Client.KeyAttestation from 4.84.1-preview to GA 4.84.2 so it aligns with MSAL 4.84.2 already on master. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * address pr comments --------- Co-authored-by: gladjohn <gladjohn@microsoft.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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What
Adds a developer-experience design document for enabling mTLS Proof-of-Possession (mTLS PoP) on the two managed-identity credential sources that currently don't support it:
AcquireTokenOptions.ManagedIdentity(pure Managed Identity)SignedAssertionFromManagedIdentity(Federated Identity Credential signed by a Managed Identity)The doc lives at
docs/design/msi_fic_mtls_pop_devex.md, alongside the existingmanaged_identity_capabilities_devex.md.Why
Microsoft.Identity.Webalready supports mTLS PoP for confidential client apps that authenticate with a certificate (seetoken-binding.md). The opt-in is one line of configuration:The same opt-in does not work today for the two managed-identity credential sources:
SignedAssertionFromManagedIdentity(FIC)AcquireTokenOptions.ManagedIdentity(MSI)This is the gap the proposal closes.
What's in scope
"ProtocolScheme": "MTLS_POP"knob enables mTLS PoP for all three credential sources.daemon-app-msi-mtlsanddaemon-app-fic-mtls, modeled on the existingdaemon-app-msi.token-binding.md(add MI + FIC subsections) andcertificateless.md(add a short cross-ref).What's out of scope
token-binding.md.Prerequisites for the implementation PR
Microsoft.Identity.Webtakes a dependency onMicrosoft.Identity.Client.KeyAttestation(GA in the next MSAL release).