Decomposition of docs/reviews/002-post-remediation-review.md per its 5-unit remediation plan: - Unit 1 (security-critical): gw15-publish-body-cap, prj16-schema-via-call (CF-004 filed alkcall-side), fwd13-dot-segments, fwd16-missing-capability, oai11-ref-memoization - Unit 2 (timeout/terminality): ws13-idle-progress, fwd15-stream-timeout, cli01-retry-after-budget, con17-mcp-pagination, con18-wss-sweep-exit - Unit 3 (projection/docs): projection-truthfulness, mcp-batch-cap, gw16-status-drift - Unit 4 (spec-import): yaml-normalization, oai13-path-item-wildcards, import-loudness-cluster, js01-placeholder-check, fwd17-19-contract-decisions - Unit 5 (WS polish + tests): con18b-ws-polish, client-policy-wire-tests, cov-deployment-knobs, cov13-dead-code, srv11-srv12-router-ordering - review-002-bracketed-followup: tentatively planned post-bulk pass (stale-check, OQA-18 enforcement decision, CON-08/09 close() lever, cross-crate re-checks) — deliberately not serialized against the bulk Also: review-002 numbering repair (CON-14 was double-booked; MCP pagination now CON-14, from_wss monitor renumbered CON-18, missing CON-14 section added). taskgraph: 66 valid, no cycles; 24 pending (all review-002); gen-1/gen-2 parallel waves identified; workflow-cost hotspots are prj16 (12.8) and ws13 (11.1), both carrying the reviewed slicing guidance in their Notes.
3.6 KiB
id, name, status, depends_on, scope, risk, impact, level, tags
| id | name | status | depends_on | scope | risk | impact | level | tags | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| review-002-prj16-schema-via-call | Block Internal-op schema disclosure via services/schema over /call (PRJ-16, cross-crate CF-004) | pending | moderate | medium | project | implementation |
|
Description
Review 002 PRJ-16 [major, security]. Internal/ACL-restricted op specs
are readable through the op path even though the GET /schema route
was fixed in review-001 (SRV-02):
call_handler(src/gateway/routes.rs:120-133) pre-checks only the outer op name —services/schemais External with default ACL, so the pre-check passes.registry.invokedispatches to alkcall'sservices_schema_handler(alkcall src/registry/discovery.rs:327-343), which does a bareregistry.registration(name)→spec_to_jsonwith no visibility and no AccessControl check.
POST /call {"operation":"services/schema","input":{"name":"secret/op"}}
→ the full spec (input/output/error schemas + required_scopes) of any
Internal op, unauthenticated. Same hole via the MCP call tool. The
regenerated to_openapi doc asserts "Internal (hidden from HTTP
discovery, GW-02)" — currently false at runtime. The alkcall-side
instance is filed as CF-004 in
alkcall/docs/reviews/consumer-findings-ledger.md (the handler-level
fix there is the complete one; this task is the alkhttp-local layer).
Acceptance Criteria
- alkhttp-side guard: before dispatch, when the requested
operation resolves to a
services/schema-family handler, apply the same is_internal_op + access_check_for_op pre-checks to the innernameinput as GET/schemadoes (404 for Internal, 403 for ACL denial, mirroring routes.rs:151-156) - Implementer's choice on mechanism (options: a dispatch-path hook
in
call_handler/batch_handler/subscribe_handler; an alkhttp-side wrapper around the registry that interceptsservices/schemainputs; a GatewayDispatch-level check) — the invariant is transport-level: no alkhttp transport may fetch a spec the GET/schemaroute would deny for the same identity - Test matrix mirroring the GET /schema tests:
/callon services/schema{internal-op} → 404; unauthorized identity → 403; MCPcalltool with the same input → same result (feature-gatedmcptest) - A comment/ADR-note recording that the complete fix is alkcall-side (CF-004) and this task is the local layer — when CF-004 lands, the alkhttp guard becomes defense-in-depth (do NOT remove it; the per-transport check stays)
cargo test,cargo clippy --all-targets -- -D warnings,cargo fmt --checkpass (plus--all-featuresif the mcp test lands)
References
- docs/reviews/002-post-remediation-review.md (Part F', PRJ-16)
- alkcall/docs/reviews/consumer-findings-ledger.md (CF-004, filed 2026-08-30)
- alkcall/src/registry/discovery.rs:327-343 (the unchecked handler)
- src/gateway/routes.rs:120-133 (outer-name-only pre-check), 151-156 (the correct GET /schema checks to mirror)
- docs/architecture/decisions/015-privilege-model-and-authority-context.md
Notes
The three gateway invoke routes (/call, /batch, /subscribe) all
dispatch through the same spine, so a single interception point (if
found) covers all three + MCP; if the mechanism is route-local, mirror
it in all three pre-check sites. Do not block on the alkcall fix —
this task is shippable independently and the alkcall lead time is
unknown. If CF-004 lands first, re-scope this task to defense-in-depth
assertions only.