Remediates the rfc-app application + deploy-config findings from the
Session 0026 security audit. Cut as the "v0.25.0-security-hardening"
branch (from v0.24.0); reversioned to 0.27.0 on rebase onto main since
v0.26.0 (#28) shipped while this was in flight.
- C1 (Critical): single sanitizeHtml.js chokepoint (DOMPurify) for every
marked→innerHTML / dangerouslySetInnerHTML sink (MarkdownPreview,
ProposalView x2, Editor); rel=noopener hook on target=_blank links.
- H1: per-account OTC-verify lockout (migration 023, auto-applied) +
per-IP throttle via new ratelimit.py; wired on otc verify/request +
passcode check/verify.
- M1: device_trust.lookup() single indexed-row read — cookie value is now
"<row_id>.<raw_token>"; bcrypt-checks one row, not a global table scan.
(Behavior change: existing device-trust cookies re-prompt once.)
- M2: HTTP security headers (CSP/HSTS/XFO/XCTO/Referrer-Policy) at nginx.
- M4: session cookie Secure-by-default (SESSION_COOKIE_SECURE opt-out).
- M5: bounce webhook fails CLOSED (503) when secret unset, instead of open;
RFC_APP_INSECURE_BOUNCE_WEBHOOK=1 dev opt-in.
- L2/L3: per-IP cooldown + check-endpoint throttle.
- L4: systemd sandbox knobs. L8/I1: nginx server_tokens off + TLS1.0/1.1 out.
VERSION + frontend/package.json → 0.27.0; CHANGELOG documents the upgrade
steps (incl. the out-of-band nginx + systemd apply, which the flotilla
deploy gesture does not perform).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Ben Stull