Adopt canonical flex-auth credential checks

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02e56-e4ad-71a2-b3e2-b6193e0d8093

scripts/credential.py

@@ -31,6 +31,11 @@ UNSAFE_VERBOSE_VALUES = {"debug", "trace"}
 DEFAULT_ACTOR_TYPE = "approved-agent"
 DEFAULT_ACTOR = f"codex:{os.environ.get('USER', 'unknown')}"
 DEFAULT_SUBJECT = "agent:codex/railiance-platform"
+FLEX_AUTH_SUBJECT_TYPES = {
+    "human-operator": "Human",
+    "approved-agent": "Agent",
+    "ci-runner": "Automation",
+}
 
 
 @dataclass(frozen=True)
@@ -207,7 +212,7 @@ def post_json(
     return data
 
 
-def request_metadata(
+def flex_auth_check_request(
     *,
     grant: dict[str, Any],
     ttl: str,
@@ -217,17 +222,26 @@ def request_metadata(
     actor_type: str,
     subject: str,
 ) -> dict[str, Any]:
+    subject_type = FLEX_AUTH_SUBJECT_TYPES.get(actor_type)
+    if subject_type is None:
+        fail(f"actor type {actor_type!r} has no flex-auth subject type mapping")
     return {
-        "grant_id": grant["id"],
-        "actor": actor,
-        "actor_type": actor_type,
-        "subject": subject,
-        "purpose": purpose,
-        "requested_ttl": ttl,
-        "delivery_mode": delivery,
-        "audience": grant.get("audience"),
-        "issuer": grant.get("issuer"),
-        "credential_type": grant.get("credential_type"),
+        "tenant": "tenant:platform",
+        "subject": {"id": subject, "type": subject_type},
+        "action": "issue",
+        "resource": {
+            "id": f"credential-grant:{grant['id']}",
+            "type": "credential-grant",
+            "system": "railiance-platform",
+        },
+        "context": {
+            "actor": actor,
+            "actor_type": actor_type,
+            "bound_subject": subject,
+            "purpose": purpose,
+            "delivery_mode": delivery,
+            "requested_ttl_seconds": ttl_seconds(ttl),
+        },
     }
 
 
@@ -264,7 +278,7 @@ def authorize_request(
         )
 
     endpoint = join_url(args.flex_auth_url, args.flex_auth_path)
-    payload = request_metadata(
+    payload = flex_auth_check_request(
         grant=grant,
         ttl=ttl,
         purpose=purpose,
@@ -288,30 +302,36 @@ def authorize_request(
             "flex-auth unavailable; local preauthorization used",
         )
 
-    allowed_value = response.get("allowed")
-    decision_value = str(
-        response.get("decision") or response.get("status") or ""
-    ).lower()
-    allowed = allowed_value is True or decision_value in {
-        "allow",
-        "allowed",
-        "approved",
-        "pass",
-    }
-    denied = allowed_value is False or decision_value in {
-        "deny",
-        "denied",
-        "rejected",
-        "fail",
-    }
-    decision_id = response.get("decision_id") or response.get("id")
-    reason = response.get("reason") or response.get("message")
-    if denied or not allowed:
+    effect = response.get("effect")
+    decision_id = response.get("id")
+    reason = response.get("reason")
+    if effect != "allow":
         fail(f"flex-auth denied credential request: {reason or 'no reason supplied'}")
+    if not isinstance(decision_id, str) or not decision_id:
+        fail("flex-auth returned an allow effect without a decision id")
+    response_subject = response.get("subject")
+    if (
+        not isinstance(response_subject, dict)
+        or response_subject.get("id") != payload["subject"]["id"]
+    ):
+        fail("flex-auth allow decision subject does not match the request")
+    response_resource = response.get("resource")
+    if not isinstance(response_resource, dict) or any(
+        response_resource.get(field) != payload["resource"][field]
+        for field in ("id", "type", "system")
+    ):
+        fail("flex-auth allow decision resource does not match the request")
+    provenance = response.get("provenance")
+    if (
+        not isinstance(provenance, dict)
+        or not provenance.get("evaluator")
+        or not provenance.get("mode")
+    ):
+        fail("flex-auth allow decision has no evaluator provenance")
     return AuthorizationResult(
         True,
         "flex-auth",
-        str(decision_id) if decision_id else None,
+        decision_id,
         str(reason) if reason else None,
     )
 
@@ -1096,7 +1116,7 @@ def build_parser() -> argparse.ArgumentParser:
     parser.add_argument("--flex-auth-url", default=os.environ.get("FLEX_AUTH_URL"))
     parser.add_argument(
         "--flex-auth-path",
-        default=os.environ.get("FLEX_AUTH_PATH", "/credential-grants/authorize"),
+        default=os.environ.get("FLEX_AUTH_PATH", "/v1/check"),
     )
     parser.add_argument("--require-flex-auth", action="store_true")
     parser.add_argument(