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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## feature/VPR-151-dynamic-login-screen #298 +/- ##
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Pull request overview
Copilot reviewed 22 out of 22 changed files in this pull request and generated 2 comments.
Suppressed comments (1)
web/Classes/EntraIdClaimMapper.cs:104
- The HasMultifactorAuthentication doc comment currently asserts that v2.0 tokens “omit amr entirely” unless optionalClaims requests it, but the PR description’s “Known gaps” section states v2.0 ID tokens do not carry amr (so the translation won’t fire on TEST/PROD). To avoid future confusion, please make the comment conditional (“when present”) and clarify what the app expects to be configured upstream for MFA signaling.
/// <c>amr</c> ("authentication methods references") is an array in a v2.0 id_token, so it
/// arrives as repeated claims. "mfa" is the standard value; "ngcmfa" appears for a freshly
/// proofed credential. A Duo-backed campus sign-in was observed to carry ["pwd", "mfa"]
/// (2026-08-31). The claim only exists because the app registration's manifest requests it:
/// optionalClaims.idToken must contain { "name": "amr" }; without that entry v2.0 tokens
/// omit amr entirely and every Entra session would fail the 2FA policy.
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@web/Classes/EntraIdSettings.cs`:
- Around line 114-116: Update EntraIdSettings.IsConfigured to validate and
normalize TenantId and ClientId before OIDC registration: trim whitespace and
require both documented identifiers to pass Guid.TryParse, returning false for
malformed values while preserving valid configuration behavior.
In `@web/Controllers/EntraLogoutController.cs`:
- Line 83: Update the Entra logout flow around Revoke and its session-tracking
logic to revoke only session IDs known to be active, rejecting or ignoring
unknown IDs and requests without an issuer. Add bounded admission controls that
do not evict existing valid revocation entries, and preserve revocation behavior
for authenticated, tracked sessions.
In `@web/Controllers/HomeController.cs`:
- Line 673: Update the Logout action to require POST via its route attribute,
preserving its existing sign-out behavior. Replace the logout link that invokes
this action with a POST form containing `@Html.AntiForgeryToken`(), while
retaining the logout styling and destination.
In `@web/Program.cs`:
- Around line 662-670: Mask unsupported flags from settings.EnabledProviders
against LoginProviders.Both before the existing LoginProviders.None check, log
when unsupported bits are present, and assign the masked value back so values
such as 4 resolve to None and use the existing CAS fallback.
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📒 Files selected for processing (28)
DESIGN.mdPRODUCT.mdtest/Classes/AuthorizationFallbackTests.cstest/Classes/CspPolicyTests.cstest/Classes/DuoAuthenticationRequirementTests.cstest/Classes/EntraIdClaimMapperTests.cstest/Classes/EntraIdSettingsTests.cstest/Classes/EntraSessionRevocationStoreTests.cstest/Classes/HomeControllerCasUrlTests.cstest/Controllers/EntraLogoutControllerTests.cstest/Controllers/HomeControllerTests.csweb/Classes/AuthenticationSettings.csweb/Classes/CspPolicy.csweb/Classes/DuoAuthenticationRequirement.csweb/Classes/EntraIdClaimMapper.csweb/Classes/EntraIdSettings.csweb/Classes/EntraSessionRevocationStore.csweb/Classes/LoginProviders.csweb/Controllers/EntraLogoutController.csweb/Controllers/HomeController.csweb/Program.csweb/Views/Home/Welcome.cshtmlweb/Viper.csprojweb/appsettings.Development.jsonweb/appsettings.Production.jsonweb/appsettings.Test.jsonweb/appsettings.jsonweb/wwwroot/css/welcome.css
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Campus is retiring CAS in favor of Entra ID. Both providers now sign in to the same cookie, so a session is identical downstream whichever was used, and the cutover becomes a config change rather than a code change. - Register an OpenID Connect handler (auth code + PKCE) as a public client: no client secret, so nothing expires or rotates. Signing keys come from the app-specific discovery document, since the enterprise app's claims mapping signs tokens with its own certificate - Remap Entra claims to the bare, lowercased kerberos id ClaimsTransformer resolves users by, read from the mapped onpremisessamaccountname claim only: preferred_username is the campus email alias, and an alias that collides with someone else's kerberos id would resolve to the wrong user, so a token without the mapped claim is rejected rather than signed in. Casing matters: UserHelper.IsInRole and the emulation cache key both compare login ids with an ordinal ==, so a mixed-case id would break emulation - Source TenantId and ClientId from Parameter Store /Shared/EntraId; one registration serves every environment and neither value is secret - Gate providers on Authentication:EnabledProviders (Cas, EntraId or Both). Development and TEST run both, PROD stays CAS - Widen the default and SVMUser policies, which required a "CAS" authentication-method claim and would have rejected every Entra session - Translate Entra's amr=mfa into the credentialType claim the Duo 2FA policy reads, so both providers satisfy [Authorize(Policy = "2faAuthentication")]. amr only reaches v2.0 id_tokens because the registration manifest requests it via optionalClaims; it stays conditional because campus grants Duo exceptions, and a password-only sign-in must fail the gate - Keep /login as the single entry point every existing sign-in link uses; it picks the provider, or defers to the splash when both are offered - Fall back to CAS when no provider is usable. Throwing killed the host, so a half-finished cutover would have taken CAS down with it - Send an Entra user to the app root on logout once Entra is switched off, rather than to a CAS logout they never had a session for
- Carry Entra's sid into the sign-in cookie; it is the only handle a
later logout has on the session
- Record the sign-out server side and enforce it on the next request.
Entra frames the endpoint cross-site, where the SameSite=Lax cookie is
neither sent nor accepted, so it cannot be cleared directly
- Exempt the endpoint from frame-ancestors 'none', which would otherwise
stop the iframe loading and the notification arriving at all
- Relay sid and iss to VIPER 1, which shares the registration's single
front-channel logout URL and so cannot hear from Entra itself
- Point each environment at its own VIPER 1 origin, at the host root
rather than under the /2 PathBase that belongs to the VIPER 2 sub-app
- Needs optionalClaims.idToken { "name": "sid" } on the app
registration, and the logout URL pointed here; without either, nothing
matches and sessions live out their 12 hours
…ccount
Matches the account handling VIPER 1 shipped under VPR-94. With two Entra
accounts signed in, signing out of one left the other, and every later
sign-in silently reused it with no way to pick.
- Send no prompt on an ordinary sign-in. Entra signs a single signed-in
account straight through and raises its own picker only when several
match, so select_account sits behind a "use a different account" link
on the splash rather than charging everyone with one account a click
- Send domain_hint, default ucdavis.edu, so campus users skip Microsoft's
home-realm step and stop typing an email address. Left off the picker
request: with it the authorize call reaches adfs.ucdavis.edu before a
picker could render, and it hides accounts in other verified domains
such as ad3.ucdavis.edu. Blank the setting to turn it off everywhere
- Carry the login_hint claim on the cookie and send it back as
logout_hint, so sign-out ends the right account instead of asking
which. SaveTokens is off, so id_token_hint is never sent and this is
the only handle sign-out has; Entra ignores a UPN or preferred_username
- Needs optionalClaims.idToken { "name": "login_hint" } on the app
registration, already configured. Without it, or on a session predating
it, sign-out omits logout_hint and sends exactly the URL it sent before
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Stacked on #216 (
feature/VPR-151-dynamic-login-screen): review that one first. This PR targets it, so the diff here is only the Entra work.Campus is retiring CAS in favor of Microsoft Entra ID. This adds Entra as a second login provider so TEST can run both side by side, and makes the eventual cutover a config change rather than a code change.
Config
New
Authentication:EnabledProviders, acceptingCas,EntraId, orBoth.BothBothCasCutover is editing that one value to
EntraId.There is no client secret. The app is a public client (authorization code + PKCE): the redirect URIs are registered on Entra's "Mobile and desktop applications" platform, which is what lets the code exchange run without a credential.
EntraId:TenantIdandEntraId:ClientIdcome from AWS Parameter Store at/Shared/EntraId/; one app registration serves VIPER 1 and VIPER 2 in every environment, and neither value is secret.appsettings.jsonleaves both empty on purpose so a missing parameter failsIsConfiguredand degrades to CAS.How it works
Entra is a standard OIDC handler (auth code + PKCE,
form_post) that signs in to the same cookie CAS already uses, so nothing downstream needs to know which provider a user picked.OnTokenValidatedrewrites the principal into the exact claim shapeAuthenticateCasLoginproduces. That matters becauseClaimsTransformerdoesprincipal.Identity.NametoUserHelper.GetByLoginId, soClaimTypes.Namehas to be the bare kerberos id. Entra'spreferred_usernameis the campus email alias (rvlorenzo@ucdavis.edu), not the kerberos id (rexl), so the login id is read from a mappedonpremisessamaccountnameclaim (ADsAMAccountName) that the enterprise app emits into the JWT. There is deliberately no fallback topreferred_username/upn/email: an alias that collides with someone else's kerberos id would resolve to the wrong user, so a token without the mapped claim is rejected rather than signed in, and the log lists the claim types received.Because the enterprise app carries that claims mapping, Entra signs this app's tokens with the app's own certificate instead of the tenant keys. The handler therefore reads its metadata from the app-specific discovery document (
.../v2.0/.well-known/openid-configuration?appid=<client-id>,EntraIdSettings.MetadataAddress); the tenant-wide one fails validation withIDX10503./loginstays the single entry point every existing sign-in link already uses (Razor layout, session timeout, profile menu, VuebuildLoginUrl); none of those call sites changed. It picks the provider when only one is enabled, and defers to the splash when both are. The splash's own buttons pass?provider=explicitly, which is what stops the CAS button from bouncing back to the splash.Two things that would have broken every Entra login
Program.csgated both theSVMUserpolicy and the app-wideDefaultPolicyonAuthenticationMethod == "CAS"literally. Entra sessions would have failed authorization on every request. Both now accept either provider.[Authorize(Policy = "2faAuthentication")]) checks acredentialTypeclaim that only CAS emits. The mapper translates anamr=mfaclaim into an accepted credential type. v2.0 ID tokens omitamrunless the registration's manifest requests it (optionalClaims.idTokenwith{"name": "amr"}, configured); a Duo-backed sign-in was then observed to carryamr=["pwd","mfa"]. The translation stays conditional because campus grants Duo exceptions, so a password-only Entra sign-in fails the gate exactly like a Duo-less CAS session would.Failure modes found in review and fixed
This went through an automated review loop plus an adversarial pass. Five real defects came out of it, all fixed here:
EnabledProvidersstops includingEntraIdwhile Entra cookies are still valid (12h expiry), the user fell through to the CAS logout redirect. They never had a CAS session, so they got the wrong page and their upstream Entra session was never ended. The branch keyed off current config where it should key off how the user actually authenticated.EnabledProviders = EntraIdwith any one Entra setting missing narrowed the set toNone, which threw, which propagated out of the startuptryand killed the host, taking CAS with it. Now it degrades to CAS with a fatal log. Losing the site is a far worse outcome than serving the provider that still works./apiguard ran after provider dispatch inLogin, so an/api/...ReturnUrl reached the Entra challenge or the chooser splash instead of 401ing, whenever Entra was enabled./welcome?ReturnUrl=/api/...returned 200 inBothmode. That mode skips the deep-link branch, which is what enforced the guard. Now stated explicitly onWelcome, so all provider modes agree.AuthorityOverridewas unused and madeIsConfiguredaccept a tenant or an override, letting a tenant-less config register the handler. Removed.Tests
Backend suite passes. New coverage: the claim mapper (domain stripping, no-fallback rejection, casing,
amrhandling, principal shape),EntraIdSettings.IsConfiguredandMetadataAddress, the Duo 2FA gate end-to-end through the mapper, and controller tests for provider selection, the/apiguard in every provider mode, all four logout paths, and a regression guard for the/welcomeand/loginloop.Note on the unrelated RAPS one-liner
Adding the OIDC package upgrades
Microsoft.IdentityModel.*, which drops the incidentalIsNullOrEmpty()extensionRAPSController.cs:234was relying on. Swapped for.Count > 0, matching whatRAPSSecurityService.cs:162already does for the same call. It was a compile break, not optional.Verified locally
A real sign-in against the UC Davis tenant completes end to end: the code exchange succeeds without a secret, the mapped claim arrives, and the user lands as their kerberos id with AAUD roles. The chooser, the authorize request shape, the
/apiand redirect-loop guards, and the callback failure paths were checked with curl; the smoke test plan isSMOKETEST-EntraID-Login.md. Admin consent on the registration is granted.Before TEST can use this
Both outside this repo:
https://secure-test.vetmed.ucdavis.edu/2/signin-entraand/2/signout-entraon the app registration, under the Mobile and desktop applications platform (the/2PathBase is added by ASP.NET, so it must be part of the registered URI)./Shared/EntraId/TenantIdandClientId; until it can, startup logs a fatal and falls back to CAS-only rather than showing a button that dead-ends.Known gaps
amr. Right after the manifest change, silent sign-ins carried noamrat all (likely propagation lag, but unproven); such a session reads as non-MFA until a fresh interactive login. Watch on TEST.SaveTokens = false, so federated sign-out has noid_token_hintand Entra may show an account picker at logout instead of signing straight out. To be confirmed on TEST before adding token storage.Entra ID login rejectedin the log) rather than signed in as their email alias.Login id casing
Worth a reviewer's eye.
UserHelper.cs:94comparesAaudUser.LoginIdtoUser.Identity.Namewith an ordinal, case-sensitive==, and the emulation cache is keyed on this claim inClaimsTransformerbut onAaudUser.LoginIdinEmulateUser. A mixed-case id would therefore silently break emulation and force a DB round trip on every role check. The resolved id is lowercased to match what CAS supplies. That assumes AAUD login ids are lowercase kerberos ids, which is what CAS has been feeding it all along.