Closes the local protocol surface of gap G01 from the scope assessment
(KEY-WP-0016). The browser grant validated PKCE, client id and scopes but left
four bindings unenforced, and UserInfo verified less than the caller CLI does.
Authorization-code path: bind the exchange to the redirect URI the code was
issued for, refuse clients whose registration does not permit the grant, and
authenticate confidential clients with a digest-based constant-time comparison
over the same credential sources as the service grant. An empty grantTypes stays
an implicit authorization-code client, matching config validation.
Code consumption: SessionStore.Consume reads and deletes under one lock. The
previous Get/Delete pair spanned JWT signing, and the added test reproduces the
race against that version -- 9 of 16 concurrent exchanges succeeded, and a
failed exchange left the code replayable.
UserInfo: check the JOSE header algorithm before trusting the signature, require
the configured issuer, and require an access token rather than accepting an ID
token of the right shape. Purpose is decided on the scope claim so the issued
token contract, which consumers pin exactly, does not change.
SCOPE.md and the assessment record which bindings are now enforced and that the
Authelia upstream-trust assumption remains open, so G01 is not fully closed and
no profile-conformance claim is made.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NV9oijZukGyGbRQGGKnK4P
Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 713576@bnt-lap001
Assistant-Session: 384c511d-9bce-4cb8-a676-2aef6c0c8df6
Verified first: grant_types_supported advertises client_credentials in
discovery.go, but token.go only ever accepted authorization_code -- no
service-token issuance path exists at all. Building one from scratch is
materially bigger than extending the existing flow; explicitly not
attempted here, left open in the workplan rather than declared done.
What shipped for the human Authorization Code + PKCE flow:
- domain.User.Tenant (new, omitempty) + token.go's effectiveTenant():
falls back to tenant:coulomb (this workstation's actual tenant, ADR-0006)
when unset -- never an empty tenant claim, never a silent reassignment.
- principal_type: "human", unconditional.
- groups/roles promoted from scope-gated to unconditional core claims,
always [] not null when empty. One pre-existing test asserted the old
scope-gated groups behavior -- updated to match the new intentional
behavior, not left failing or reverted.
- assurance built from PKCESession.MFAVerified (new field, threaded
through completeAuthorization's two call sites in authorize.go) --
whether MFA was actually verified in this session, not static enrollment
state. aal2 only when required-and-passed this time, aal1 otherwise.
go build/vet clean, go test ./... green repo-wide. Two new authorize_test.go
cases assert MFAVerified on both paths. tests/profile/profile_test.go's
TestCompleteTokenFlow (the repo's own full HTTP integration test) extended
with real value assertions for all five claims, not just presence checks.
Python conformance tool not run against a live instance (needs the full
Authelia+LLDAP+privacyIDEA stack); TestCompleteTokenFlow's real HTTP round
trip covers the equivalent claim checks instead.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
