Fix: intersect consented attributes against requested set in getRequiredUserAttributes - #5246
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📝 WalkthroughWalkthroughThe executor now limits consent-approved user attributes to the originally requested essential and optional attributes. New tests cover intersection helpers, requested-set construction, consent filtering, and JWT claim output. ChangesConsent Attribute Filtering
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The PR narrows consent-approved attributes to those requested by the authentication flow, reducing potential claim over-disclosure. However, the current head is not merge-ready because its tests fail to compile due to duplicate helper declarations, and the required documentation update remains outstanding. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@backend/internal/flow/executor/auth_assert_executor.go`:
- Line 681: Remove the duplicate test-local declarations of
intersectAttributeSpaceList and buildRequestedAttributesSet from the executor
tests, so they resolve to the existing production helpers and avoid
redeclared-symbol errors.
- Around line 397-400: Update the consent attribute filtering documentation to
explain the JWT assertion behavior implemented by buildRequestedAttributesSet
and intersectAttributeSpaceList: consent-approved attributes are limited to the
flow’s essential and optional requested attributes, and unrequested attributes
are excluded from the JWT.
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backend/internal/flow/executor/auth_assert_executor.gobackend/internal/flow/executor/auth_assert_executor_test.go
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…redUserAttributes getRequiredUserAttributes returned RuntimeKeyConsentedAttributes without intersecting against the essential/optional attribute set from the original authorize request. This allowed attribute-scope over-disclosure when a ConsentProvider did not independently validate against the request scope. resolvePermissionsForClaim already applies this defense for permissions; this change mirrors that pattern for attributes via a new intersectAttributeSpaceList helper, closing the inconsistency. Fixes thunder-id#5137 Signed-off-by: Hashim Kalam <hashiimkalam@gmail.com>
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Purpose
getRequiredUserAttributesinauth_assert_executor.goreturned the fullRuntimeKeyConsentedAttributeslist without intersecting it against the essential/optional attribute set originally requested by the authorization request. This allowed attribute-scope over-disclosure: anyConsentProviderimplementation that doesn't independently validate against the request scope could flow extra attributes straight into the JWT assertion and userinfo response.resolvePermissionsForClaimalready applies this defense for permissions (intersecting consented permissions against authorized permissions); the attributes path was unguarded — an inconsistency in the same file.Fixes #5137
Approach
Mirrors the existing permissions defense for attributes. Added two new helpers and an intersection step in
getRequiredUserAttributes:buildRequestedAttributesSet(ctx)— Reconstructs the originally-requested attribute set by readingRuntimeKeyRequiredEssentialAttributesandRuntimeKeyRequiredOptionalAttributesfrom runtime data (the same keys the authz executor populates and the consent prompt reads from). Returns their union as a space-separated string, or""if neither key is present.intersectAttributeSpaceList(a, b)— Returns the attributes present in both space-separated inputs, preserving the order ofa. Structurally identical to the existingintersectPermissionSpaceListbut returns[]stringto matchgetRequiredUserAttributes's return type.Intersection in
getRequiredUserAttributes— When consent has been recorded and the requested attribute set is non-empty, the consented attribute list is intersected against the requested set before returning. This prevents the engine from asserting attributes that were never part of the original authorize request. When the requested set is empty (no runtime data keys present), the function falls through to the existing consented-attributes path unchanged — no behavior change for flows that don't set these keys.Design rationale. The consent prompt is built from the same essential/optional attribute set, so any attribute in the consented list that isn't in the requested set is either a ConsentProvider bug or an artifact of a provider that doesn't validate scope. The engine-level intersection closes both paths without changing the consent UX. This is the same defense posture already applied to permissions in
resolvePermissionsForClaim→intersectPermissionSpaceList.Related Issues
getRequiredUserAttributesdoes not intersect consented attributes against the originally-requested attribute setRelated PRs
Checklist
getRequiredUserAttributesconsent + intersection scenarios (essential-only, essential+optional, no overlap, subset-of-requested)intersectAttributeSpaceListunit tests (both empty, A empty, B empty, partial overlap, no overlap, identical)buildRequestedAttributesSetunit tests (both present, essential only, optional only, neither)Executeintegration test verifying JWT claims contain only the intersection (email,name) and exclude the unrequested attribute (address)breaking changelabel added.Security checks
Verification
All 14 new unit and integration tests pass. The existing
getRequiredUserAttributesandresolvePermissionsForClaimtest suites continue to pass with no regressions.Summary by CodeRabbit