An end-to-end audit of the (unmerged) interceptor slice surfaced seven ways a
KV allow/deny guard could be silently defeated or misbehave. Close all of them:
1. Shared-collection bypass — `kv::shared_collection(...).set/delete` skipped
the hook entirely, so any `(kv, set/delete)` guard was circumvented by
choosing the shared handle. `GroupKvHandle` now runs the same before-op hook.
2. Seal to the declaring owner — the marker resolved nearest-owner-wins but its
script name was then re-resolved on the CALLER's chain, so a descendant app
could shadow a group's mandatory guard with a same-named local script.
`resolve_before` now returns the script sealed to the owner that declared the
marker (one LEFT JOIN in manager-core), so the executor never re-resolves by
name. A descendant can only override with its OWN explicit marker.
3. Re-entrancy — an "allow + audit-log" guard that itself wrote KV re-triggered
itself to the depth cap and then DENIED the original write (plus ~8x
resolve/compile/execute amplification). A thread-local guard makes a write
performed by an interceptor bypass interception.
4. Fail-closed verdict — only `#{ allowed: false }` denied; a bare bool, a
typo'd key, a non-bool, or a bare unit all ALLOWED. Now allow ONLY on an
explicit `#{ allowed: true }`; every other shape denies.
5/6. Fail-closed edges — a dangling (missing/disabled) interceptor script and a
missing engine back-reference now DENY instead of allowing.
7. AppInvoke coupling — resolution no longer routes through `invoke.resolve`, so
installing a guard no longer denies writes to principals who hold KV-write
but not AppInvoke.
The seam (`InterceptorService::resolve_before`) now returns an
`InterceptorResolution { None | Dangling | Run(ResolvedScript) }`; the executor
runs the sealed script straight through the shared `run_resolved_blocking` core
and drops its `InvokeService` dependency. executor-core stays Postgres-free.
No migration change (0073 unchanged).
Pinned by three new journeys in tests/interceptors.rs: the seal (a same-named
app script does NOT shadow the group's guard), shared-collection coverage, and
the fail-closed verdict. Full journey suite 157/157.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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