Addresses the confirmed findings from /sh-security-review + the GPT-4.1
cross-review of the Plane-2 scaffold. Full suite: 589 passed; ruff clean.
FIXED (proven-exploitable):
- CI-guard denylist bypass (HIGH): Python fnmatch '**/' is non-recursive, so
root-level template.yaml/*.tf/cdk.json/*.pem/*.key/*-stack.* evaded the
trust-control surface. Replaced fnmatch with a recursive, case-insensitive
glob->regex matcher. (verified: fnmatch('template.yaml','**/template.yaml')==False)
- CI-guard scope bypass (HIGH): a '**' declared_scope made every path in-scope.
Scope is now concrete-prefix confinement (reduces a glob to its leading
metacharacter-free segments; '**' -> empty -> dropped -> unscoped reject).
- Box-side vs CI denylist divergence (MED): builders.py _DENY_PATTERNS now covers
Terraform, *.pem/*.key, CDK stack files, .github/actions, *iam*, bare policy*.json
(case-insensitive), matching the CI surface.
- force-resume was backwards (MED): it superseded the answered row recovery
resumes from, making a stuck task permanently un-resumable while printing
success. Now re-opens an EXPIRED (parked) question via a new reopen_question
CAS helper; never supersedes an answered row; honest exit codes.
- operator attribution (MED): run-team.py --operator defaulted to "" -> now the
OS login, so destructive actions are always attributable.
- audit-log append race (MED): replaced read-modify-rewrite (lost records under
concurrent operators) with an O_APPEND single-line write, mode 600 enforced.
- lstrip("ab/") path-mangling in the symlink error path -> regex prefix strip.
Regression tests added across test_ci_gate_workflow / test_builders / test_run_team
/ test_schema. Design-level findings (resume-worker durability, egress breadth,
answered_at ordering, DB-swap TOCTOU, diff-hash threat-model) are pre-deployment
/ P1-build-proper and recorded with written justification in
agent-team/.security-review/suppressions.json; CI README diff-hash wording made
honest.
Resolves the GPT-4.1 cross-review FIX items on the §3.3.2 CI apply/verify guard:
- Symlink-escape (Medium-High): reject any candidate diff that introduces a
symlink (git mode 120000). A symlink can redirect a later in-diff write into a
denied path that textual canonicalization cannot see; auto-built diffs have no
legitimate symlinks, so this fails closed (exit 7).
- Diff-parse robustness (Medium): decode the diff as strict UTF-8 and fail closed
(exit 8) instead of errors='replace', closing homoglyph/encoding evasion.
- Declared-scope canonicalization (Medium): drop parent-escaping scope globs so a
malformed scope can only shrink coverage, never widen it past repo root.
- Egress allowlist (Low-Med): explicit DEPLOY marker to parameterize the
build-test registries per target repo before enabling.
Backs the gate's correctness claim with a committed, runnable suite
(tests/test_ci_gate_workflow.py) that extracts the inline guard from the YAML and
exercises good + adversarial diffs (clean, hash mismatch, workflow delete,
copy-into-denied, symlink, non-UTF-8, out-of-scope, unscoped, escaping scope).
Corrects the README "Tests" section that claimed coverage that did not exist.
Full suite: 557 passed, 1 skipped; ruff clean.
