- BLOCK: cap candidate diff at 40 KB in the dispatcher (the diff rides a base64
workflow_dispatch input; GitHub caps inputs at ~64 KB so an oversized diff
cannot dispatch at all) + a defense-in-depth decoded-size bound in materialize.
- FIX: harden the draft-PR HEAD_BRANCH guard to reject leading/trailing slash,
'..' segments, and '//' (CWE-88 git ref-traversal), not just bad charset.
- NIT: document the mandatory invariants on gate-and-pr (required-reviewer
environment must stay; runs-on must stay GitHub-hosted).
- QUESTION (lockfiles): answered in-code — the build-test sandbox is
credential-less + egress-blocked, so lockfile-postinstall RCE is contained.
Tests added for all guards. 1042 tests, ruff clean, YAML valid.
Completes the box->CI diff handoff and flips the apply/verify privileged job
live (gated behind the agent-apply environment's required reviewer).
Transport (§4.3): the read-only box (D2) emits a diff but holds no write token.
- New credential-less `materialize` job decodes the untrusted `diff_b64`
dispatch input via env (CWE-94), fail-closed re-hashes it against
`expected_diff_hash`, and uploads it as the named artifact so guard/build-test
download it same-run. guard now `needs: materialize`.
- New `dispatcher.py` (the trusted apply path, operator/Mac-side — never the
box): pushes the diff as a head branch then `gh workflow run`s the workflow.
Pure input-assembly (sha256 == sha256sum, b64 round-trip, head ref) is
unit-tested; git/gh are injected seams. Push-before-dispatch; fail-closed on
empty diff/scope, unsafe task_id/owner/repo.
Flip: gate-and-pr binds `environment: agent-apply` (required reviewer
amoussa1229) + grants exactly `pull-requests: write`; the App-token + draft-PR
steps run only on `steps.gate.outputs.gate == 'pass'` (no more if:false); the
draft PR opens with an explicit `--head`; task_id/head_branch charset-validated
(§4.6). Updated the hardening tests from inert-state to live-state assertions +
added transport tests. 1039 tests, ruff clean, workflow YAML valid.
NOTE: workflow only runs on manual workflow_dispatch and the privileged job is
held at the required-reviewer gate, so nothing privileged runs unapproved.
