fiddy/docs/06_SECURITY_REVIEW.md

Security Review (Public Launch Baseline)

Purpose

This document tracks launch-critical security findings for app, data, users, and host exposure, plus current mitigation status.

Findings and Status

1. Direct home-IP exposure increases scanning and DDoS risk.

• Status: Partially mitigated.
• Mitigations in repo:
  • TLS + HTTPS redirect (docker/nginx/fiddy.conf)
  • request rate limits (docker/nginx/fiddy.conf)
  • connection cap (docker/nginx/fiddy.conf)
• Required ops actions:
  • enforce host firewall allowlist rules
  • restrict SSH to VPN or fixed allowlist
  • consider optional upstream shielding (Cloudflare free tier)

2. API abuse risk (auth and write endpoints).

• Status: Mitigated.
• Mitigations in repo:
  • server-side rate limiting (apps/web/lib/server/rate-limit.ts)
  • auth route limiter integration (apps/web/app/api/auth/login/route.ts, apps/web/app/api/auth/register/route.ts)
  • write-path limiter integration in server services (apps/web/lib/server/*.ts)
  • proxy rate limits (docker/nginx/fiddy.conf)

3. Sensitive log exposure risk.

• Status: Mitigated.
• Mitigations in repo:
  • invite/token/password redaction in error logging (apps/web/lib/server/errors.ts)
  • invite metadata stores last4 only (apps/web/lib/server/groups.ts, apps/web/lib/server/group-invites.ts)
  • removed client debug console output (apps/web/components/tag-input.tsx)

4. Request traceability gaps for incident response.

• Status: Mitigated.
• Mitigations in repo:
  • API response includes request_id + requestId compatibility alias
  • request-id propagation through proxy (docker/nginx/includes/fiddy-proxy.conf)
  • request-id response header (docker/nginx/fiddy.conf)
  • structured JSON access logging (docker/nginx/fiddy.conf)
  • nginx log ingestion by promtail (docker/observability/promtail-config.yml)

5. Session and auth contract risk.

• Status: Mitigated.
• Mitigations in repo:
  • DB-backed sessions with HttpOnly cookie use preserved (apps/web/lib/server/session.ts, auth routes)
  • route/service authorization remains server-side (apps/web/lib/server/group-access.ts, service modules)

6. Data leakage risk for receipt bytes.

• Status: Mitigated.
• Mitigations in repo:
  • entries list services do not return receipt bytes (apps/web/lib/server/entries.ts)
  • receipt bytes remain separate retrieval flow by contract

Open Operational Tasks (Not Code)

1. Rotate all production secrets before public launch.
2. Run weekly restore drill and track measured RTO/RPO.
3. Enable host-level ban tooling (Fail2ban or CrowdSec) on nginx logs.
4. Create Grafana alerts for:

• elevated 5xx rate
• repeated 401/403 spikes
• DB connectivity failures
• disk usage thresholds

Verification Checklist

• npm run lint passes (warnings acceptable for now).
• npm test passes.
• npm run build passes.
• Production host firewall rules verified (scripts/harden-host-ufw.sh + scripts/check-host-security.sh).
• SSH restricted to VPN/allowlist.
• Backup restore drill logged for current week (scripts/restore-drill-postgres.sh).