21b81ea068
* feat(#1681): ADR-1239 Phase C-2 — external-descriptor trust gate (configHome confinement) [slice 1] Phase 4 slice 1. Load-time, fail-closed configHome write-confinement for installed third-party host-plugin descriptors — defense-in-depth on top of the existing opt-in/schema/consent/first-party-wins loader gates + Phase 2's install-time assertDestWithinConfigHome (#1679 AC3). - src/external-descriptor-trust.cts: isPathConfined(target, root) pure cross-platform containment primitive + assertDescriptorConfined(descriptor, configHome) — walks runtime.artifactLayout global/local destSubpaths, throws fail-closed (naming descriptor + path) on the first escape. Rejects ../escape + absolute-outside-root. Missing layout / invalid entries skipped. - tests/external-descriptor-confinement.test.cjs: 7 tests (containment primitive, benign passes, global/local/absolute escapes rejected, missing layout, invalid entries). Load-time twin of Phase 2's install-time gate — rejects malformed/escaping descriptors BEFORE consent even matters. NOT wired into loadRegistry yet (slice 2, 4 callers, medium blast radius); this ships the reusable gate + tests. Not the ADR-1577 prompt-injection breaker (separate concern, shared word trust). Proactive CI gates: ADR-457 ignores + INVENTORY-MANIFEST + injection-scan audit. All clean locally (7 tests + security + inventory + eslint 0 problems). * chore(changeset): add Changed fragment for external-descriptor trust gate (#1681)
8 lines
689 B
Markdown
8 lines
689 B
Markdown
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type: Changed
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pr: 1806
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---
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**Internal: external-descriptor trust gate — load-time `configHome` confinement** — `assertDescriptorConfined(descriptor, configHome)` (new `src/external-descriptor-trust.cts`) fail-closed rejects any installed third-party host-plugin descriptor whose declared `destSubpath` resolves outside the user-approved `configHome`, before its install plan runs (ADR-1239 Phase C-2 / #1681 slice 1). Defense-in-depth load-time twin of Phase 2's install-time `assertDestWithinConfigHome`. Not yet wired into the loader (slice 2). No user-facing change.
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<!-- docs-exempt: internal security module; no user-facing doc surface until the loader wiring in slice 2 -->
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