35 new tests across 5 classes covering every layer of the
GHSA-5qr3-c538-wm9j defence. Each class corresponds to one chokepoint
so a regression in any single layer is caught by the named class:
* ``TestProjectPluginsEnvGate`` (13 cases) — parametrised over both
the documented truthy values (``1`` / ``true`` / ``yes`` / ``on``
+ uppercase variants) and the previously-bypassing falsy strings
(``0`` / ``false`` / ``no`` / ``off`` / ``""`` / ``False``). The
falsy half is the direct env-bypass repro: pre-fix any non-empty
string enabled the project source.
* ``TestApiPathSanitizer`` (16 cases) — unit-level coverage of the
new ``_safe_plugin_api_relpath`` helper. Absolute paths
(``/etc/passwd``, ``/tmp/payload.py``, ``/usr/bin/python``),
``..``-traversal payloads (including nested ``subdir/../../..``),
and non-string / empty / whitespace-only values must all return
``None``. Safe relative paths (``api.py``, ``backend/routes.py``)
round-trip unchanged so legitimate plugins keep working.
* ``TestDiscoveryScrubsApiField`` (3 cases) — end-to-end through
``_discover_dashboard_plugins`` with a real manifest on disk.
Verifies that the cached plugin entry's ``_api_file`` is
scrubbed *at discovery time* (``None`` + ``has_api: False``) so
any downstream consumer can't be tricked into re-deriving the
unsafe path from cache.
* ``TestMountApiRoutesRefusesUntrusted`` (3 cases) — pokes
synthetic plugin entries with each refusal vector directly into
the cache and patches ``importlib.util.spec_from_file_location``
to assert it is *not* invoked for project-source / traversal
payloads, and *is* invoked normally for bundled / user plugins.
* ``TestEndToEndPocBlocked`` (1 case) — reproduces the original
advisory PoC: operator sets ``HERMES_ENABLE_PROJECT_PLUGINS=0``
believing project plugins are off, attacker plants a manifest in
CWD's ``.hermes/plugins/`` with ``api`` pointing at an absolute
payload path. Asserts that the importer is never called against
the payload path *and* that ``hermes_dashboard_plugin_evil`` is
not in ``sys.modules`` after the mount routine runs.
An autouse fixture busts ``_dashboard_plugins_cache`` before and
after each test so the production cache (populated by the
import-time ``_mount_plugin_api_routes()`` call) can't bleed in.
All 12 pre-existing dashboard-plugin tests in
``test_web_server.py`` still pass unchanged.
