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shankar0123
854135dfb7
RefreshKeys), hand-rolled group-claim resolver, 21+ negative-test
matrix, token-leak hygiene, IdP downgrade-attack defense
Phase 3 of the bundle ships the business logic that turns the Phase 2
storage primitives into a working OpenID Connect 1.0 + RFC 7636 PKCE
authorization-code flow against any enterprise IdP (Okta / Azure AD /
Google Workspace / Keycloak / Authentik / Auth0).
Service surface:
- Service.HandleAuthRequest(providerID) -> authURL, cookie, preLoginID
Builds the IdP redirect with PKCE-S256 (mandatory; RFC 9700 §2.1.1),
server-generated 32-byte state + nonce, persisted to the pre-login
row keyed by the cookie value.
- Service.HandleCallback(cookie, code, state, ip, ua) -> *CallbackResult
11-step validation: pre-login lookup-and-consume (single-use),
constant-time state compare, code-for-token exchange with PKCE
verifier, ID-token verify (alg pin via go-oidc/v3), service-layer
re-checks of iss / aud / azp (multi-aud requires it; mismatch
rejected) / at_hash (REQUIRED when access_token returned —
Phase 3 lifts the OIDC core "MAY" to a service-level "MUST") /
exp / iat-window / nonce, group-claim resolution with userinfo
fallback, group->role mapping (fail-closed on no match),
user upsert, session mint via SessionMinter port.
- Service.RefreshKeys(providerID) — explicit cache eviction +
re-load. Re-runs the IdP downgrade-attack defense so a provider
that later rotates to advertising HS* / none is caught BEFORE the
next user login attempt.
Security posture (every fail-closed branch is a sentinel error +
test):
- Algorithm pinning: allow-list {RS256, RS512, ES256, ES384, EdDSA};
deny-list {HS256, HS384, HS512, none}. Belt-and-braces re-check
via isDisallowedAlg after go-oidc.Verify.
- PKCE-S256 mandatory (oauth2.GenerateVerifier + S256ChallengeOption);
`plain` rejection sentinel exists for defense-in-depth.
- State + nonce: 32-byte crypto/rand, base64url-no-pad,
constant-time compare, single-use.
- IdP downgrade-attack defense: at provider creation / RefreshKeys,
reject any IdP whose discovery doc advertises HS* / none in
id_token_signing_alg_values_supported.
- JWKS fail-closed: in-flight login fails 503; existing sessions
untouched. isJWKSFetchError detects the gooidc verify-error
shape; ErrJWKSUnreachable is the wire mapping.
- Token-leak hygiene: ID tokens, access tokens, refresh tokens,
authorization codes, PKCE verifiers, state, nonce, signing key
bytes — NEVER logged at any level. logging_test.go pins the
invariant via a slog buffer + grep-assert across HandleAuthRequest,
HandleCallback, alg rejection, and provider-load paths.
Group-claim resolver (internal/auth/oidc/groupclaim/):
- Hand-rolled per Decision 10 (no JSON-path lib; ~150 LOC).
- URL-shape paths (https:// / http://) treated as a single
literal key — Auth0 namespaced claims like
https://your-namespace/groups work without splitting on the
dots in the URL.
- Dot-separated paths walked through nested map[string]interface{}.
- []interface{} / []string / single-string normalized to []string;
bool / number / object / nil → fail closed.
- 18 unit tests + sentinels (ErrPathEmpty, ErrSegmentMissing,
ErrSegmentNotObject, ErrInvalidValueType).
Test surface:
- service_test.go: 57 test functions including all 21 prompt-mandated
negative cases (wrong aud / wrong iss / expired / unknown alg /
alg=none / HMAC alg / azp missing on multi-aud / azp mismatched /
at_hash missing / at_hash mismatched / iat in future / iat too old /
nonce mismatched / state mismatched / state replayed / PKCE plain
sentinel / pre-login replay / forged cookie / IdP downgrade /
group-claim missing / group-claim unmapped) plus the userinfo
fallback matrix (happy path + endpoint-missing + endpoint-failing +
userinfo-also-empty), HandleAuthRequest entry point + RNG-failure
paths, upsertUser update + create + display-name fallback +
Validate-error paths, decryptClientSecret real-encrypt round-trip
+ bad-passphrase, alg-parser malformed-header matrix.
- logging_test.go: 4 hygiene tests pinning no token / code / verifier /
state / cookie / client_secret / alg name appears in any captured
log line.
- groupclaim/resolver_test.go: 18 cases covering Okta string-array,
Keycloak realm_access.roles, Auth0 namespaced URL claim,
single-string normalization, deeply-nested 3-segment walks, and
every fail-closed branch.
Coverage:
internal/auth/oidc 92.2% (floor: 90)
internal/auth/oidc/groupclaim 100.0% (floor: 95)
internal/auth/oidc/domain 96.2% (floor: 90)
Coverage gates added at .github/coverage-thresholds.yml so a future
regression in any fail-closed branch fails CI before the commit lands.
Phase 3 of cowork/auth-bundle-2-prompt.md is closed. Next up: Phase 4
(Session service: cookies, revocation, sliding-vs-absolute expiry).