sand-boxer/workplans/SAND-WP-0015-bwrap-runtime-and-private-state.md

id	type	title	domain	repo	status	owner	topic_slug	created	updated	state_hub_workstream_id
SAND-WP-0015	workplan	Provide a pinned bwrap rein runtime and private state	infotech	sand-boxer	blocked	codex	bwrap-runtime-and-private-state	2026-09-05	2026-09-05	d3f12387-fd23-58f0-b979-9c811507614d

Provide a pinned bwrap rein runtime and private state

Implement the runtime prerequisites returned by Glas in GLAS-WP-0012 and docs/local-profile-acceptance.md. Continue owner work SAND-WP-0014-T05 and live residual GLAS-IN-0002. Runtime startup is a separate acceptance gate from credential delivery, enforced provider egress, and a real model task.

Mount an owner-selected, digest-pinned Python runtime

id: SAND-WP-0015-T01
status: done
priority: high
state_hub_task_id: "93e4aad8-ba9b-5850-93d4-b5bf78ac8978"

Add exact artifact verification to trusted extension configuration and mount the standalone runtime read-only at a fixed namespace path. Reject altered content/modes, unexpected files, escaping symlinks, special files, and source or workspace overlap. A caller cannot choose runtime paths through exec input. Provide a non-editable rein-aharness/llm-connect bundle builder with recorded source revisions and resolved dependency versions.

Completed 2026-09-05. extensions/runtime.py verifies complete artifact contents/modes before a read-only mount; the builder installed committed rein-aharness 1429db5 and llm-connect 0056094 without editable source paths. Candidate digest and source/package evidence are in docs/bwrap-runtime.md.

Keep writable runtime state outside the repository

id: SAND-WP-0015-T02
status: done
priority: high
state_hub_task_id: "c8a689f8-bdf2-57a2-8521-a1c0ca44e750"

Create private mode-0700 HOME/config/cache/state/tmp directories within the namespace, preserve them across exec requests, and remove them with teardown. Keep the command environment sanitized and disable Python user-site/bytecode writes. Fail closed on profile network/setup-credential declarations that the current bwrap implementation cannot honor.

Completed 2026-09-05. Mode-0700 namespace HOME and XDG/TMP directories sit outside the copied Git tree. Explicit runtime PATH selection remains owner controlled. Unsupported egress/default-allow and setup credentials now refuse before workspace creation; regression tests cover these boundaries.

Verify the real rein runtime and owner regression paths

id: SAND-WP-0015-T03
status: done
priority: high
state_hub_task_id: "1a3002f6-c6a8-59d0-9d38-942028419de5"

Run make check, the existing authenticated cross-request owner smoke, and a real runtime startup smoke. Verify the actual rein CLI and adapter imports, read-only runtime, private HOME, clean worktree, absent source, loopback-only network, and teardown. Keep the production Glas profile blocked.

Completed 2026-09-05. make check: lint clean, 132 tests passed. Authenticated owner API smoke 223db65b returned HTTP 200 and proved exact consumer identity, stdin delivery, absent source, loopback-only network and complete teardown. Pinned runtime smoke d4de9531 ran the actual rein CLI and imported its Claude adapter, proved read-only runtime/private HOME/clean worktree, retained private state across a second exec, and removed the workspace. No model call or credential acquisition occurred; T04 remains waiting.

Resolve Claude credentials, enforced egress, and production acceptance

id: SAND-WP-0015-T04
status: wait
priority: high
state_hub_task_id: "58817ef6-76d9-5e34-908f-c024e6c99f93"

The 2026-09-05 routing lookup found no concrete Anthropic/Claude workload lane. The generic OpenBao template is not a delegable lane; the OpenRouter AppRole belongs to another rein. Credential owner railiance-platform/OpenBao plus rein-aharness must establish a concrete Claude-compatible route and delivery/ revocation contract before values can be requested or supplied to the runtime.

Sand-boxer must then implement the matching enforced provider egress contract (including DNS/TLS and denied-destination proof) and pin/deploy the actual Claude executable. No unrestricted-network or interactive-login substitute is permitted. Review the deployed runtime/profile with Glas, run its real-rein acceptance fixture, and update only the proven profile's readiness. No production schedule is enabled by the runtime-startup smoke.

This task and SAND-WP-0014-T05 remain open until those gates pass. The detailed return contract and runtime proof are in docs/bwrap-runtime.md; the live cross-repo residual remains GLAS-IN-0002.

2026-09-05 transport implementation evidence

T04 remains waiting on owner machine authentication, protected credential delivery, pinned Claude startup and the real model proof. CCR-2026-0016 custody is confirmed by a metadata-only check of live version 2; no value was read. HTTPS egress is now implemented as an exact owner/profile allowlisted CONNECT proxy while retaining an isolated network namespace. Non-secret live smoke sandbox e290e788 verified provider TLS response, undeclared destination and direct-IP denial, and proxy/workspace teardown. See docs/bwrap-egress.md.