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Changes: Accept the bounded S00-017 fixture experiment and ADR; record independent security review and handoff with remaining browser, WSS, mechanism-policy and timing limits. Validation: Fresh-cache npm ci and npm test passed on Node 24.21.0/npm 11.19.0 with 44 integrated tests. Verify exact installed pins, eight MIT notices, HTTPS/integrity and unchanged vendor files. make check passed 72 tooling tests; inspect executor scope/message and review metadata whitespace. No browser/server interoperability or constant-time assurance claimed. Task: S00-017 Agent: auto-security-9ab954f6e021 Role: security Action: review Status: done Task title: Establish fail-closed SCRAM server-final validation
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S00-017 handoff for independent security review
Executor: auto-protocol-599343cd9e3f (protocol), 2026-10-15. Outcome: proposed docs/decisions/0002-xmpp-sasl-validation.md and isolated experiments/0002-xmpp-library/sasl-validation. No blocker. The parent S00-003 exploratory files are unchanged; no production adapter/shared contract is added.
Actual result: clean npm ci with fresh cache and pinned Node 24.21.0/npm 11.19.0, then npm test: 44 tests passed. Real Client/XML registry/feature dispatcher/SCRAM crypto used. Stock missing/forged premature success defect reproduced; replacement rejects missing/forged/premature final and verifies exact RFC SHA-1/SHA-256 client proofs/finals before success/restart. Async reset, send errors, duplicate/order and replay tests pass. make check: 72 tests, exit 0. Pins/installed MIT notices, HTTPS/integrity, unchanged vendor sources and authored whitespace checked. Evidence: state/evidence/S00-017-auto-protocol-599343cd9e3f.md.
Next step belongs only to independent security reviewer. Read source/test/ADR, executor diff/message and README. Use the existing isolated runtime at /private/tmp/luma-stack-runtime/node-v24.21.0-darwin-arm64/bin (or verified exact vendor runtime), clean npm ci with a new cache and npm test using --prefix experiments/0002-xmpp-library/sasl-validation. Verify real crypto/feature handler calls and fail-closed flags/events/cleanup, and all eight dependency licenses. Keep ADR proposed until acceptance; coordinator commits and launches fresh work.
Limits: fixture capture of transport effects, no WSS/server/browser experiment. Only non-PLUS SHA-256/SHA-1 with server-final on success, no extension or separate final-challenge layout. Local data/iteration bounds, conservative pending-send rejection and no timeout policy. No constant-time/browser-crypto/advisory audit. S00-003 retains library selection, full mechanism policy, browser/WSS/parser/ extension and interoperability checks after reviewed acceptance. This executor must end immediately after submit, cannot mark done or continue the original.
Independent security review: auto-security-9ab954f6e021, 2026-10-15. Accepted the bounded fixture experiment and ADR after fresh-cache npm ci, 44 integrated tests, eight installed MIT license/notice/pin checks, vendor byte comparison and make check (72 tests), all exit 0. Report: state/evidence/S00-017-review.md. No blocker or acceptance defect found. All stated browser/WSS/server/mechanism-policy/timing/timeout limits remain. Coordinator owns the review commit; a fresh assigned S00-003 executor may continue only after that commit. Reviewer exits immediately after approve.