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feat(#1704): destSubpath write-confinement (ADR-1239 Phase B) (#1706)

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* feat(#1679): confine install writes within configHome

ADR-1239 Phase B write-confinement: a pure assertDestWithinConfigHome(configDir, destSubpath) rejects a destSubpath that escapes configHome (path traversal / NUL byte) at plan-build time on BOTH the install and uninstall plan paths; surface.applySurface and installOpencodeFamilySkills route through it, and _copyStaged carries a defense-in-depth containment check. Security-load-bearing for the Phase C third-party-descriptor loader.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs(#1704): add changeset for destSubpath write-confinement

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* test(#1704): fix windows path-portability in confinement test

The N1 'accepts a true child subpath' assertion compared against path.join (no drive resolution) while the helper uses path.resolve — on Windows that mismatches the C: drive prefix. Compute the expected via path.resolve to mirror the helper. Windows-CI-only failure (local gsd-test is Mac+Linux).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
2026-06-25 13:20:25 -04:00
committed by GitHub
parent 584dbd6a47
commit fb5f89db10
7 changed files with 901 additions and 14 deletions
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---
type: Security
pr: 1706
---
**Install write-confinement (ADR-1239 Phase B)** — the installer now rejects any runtime-descriptor `destSubpath` that would write or delete outside the user's config home (path traversal, the config root itself, NUL bytes) and refuses to follow a pre-existing symlink that escapes it. Hardening only; no change to legitimate installs.