chore: organize docs — move 37 files from root into docs/ subfolders
Root now contains only essential files: README.md, CLAUDE.md, CHANGELOG.md, CONTRIBUTING.md Reorganized into: docs/audits/ — all audit reports & checklists (71 files) docs/architecture/ — codebase overview, implementation plan docs/guides/ — auth guide, implementation checklist docs/load-testing/ — k6 load test guides & endpoints docs/security/ — payment & security reviews Also removed 5 untracked debug/investigation files and cleaned up playwright-report/ & test-results/ artifacts. Co-Authored-By: Claude Opus 4 (1M context) <noreply@anthropic.com>
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Ho Ngoc Hai
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docs/security/README_SECURITY_REVIEW.md
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# GoodGo Platform Payment Module - Security Review Documentation
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## 📋 Overview
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This directory contains a comprehensive security review of the GoodGo Platform's payment module, focusing on the Order & Escrow entities.
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**Review Date:** April 13, 2026
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**Scope:** `/apps/api/src/modules/payments/`
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**Total Files Analyzed:** 102 files across all layers (Domain, Infrastructure, Application, Presentation)
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---
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## 📄 Review Documents
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### 1. **Executive Summary** (START HERE)
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📝 File: `PAYMENT_REVIEW_EXECUTIVE_SUMMARY.txt`
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- Quick overview for stakeholders
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- Critical findings highlighted
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- Top 10 files to review first
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- Immediate action items with time estimates
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**Best for:** Decision makers, project leads, quick reference
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---
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### 2. **Complete File Inventory** (DETAILED REFERENCE)
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📝 File: `PAYMENT_MODULE_SECURITY_REVIEW.md`
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- All 102 files catalogued with descriptions
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- Organized by architectural layer (Domain, Infrastructure, Application, Presentation)
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- File locations and content summaries
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- Security strengths and concerns identified
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**Best for:** Security reviewers, architects, comprehensive understanding
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**Sections:**
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- Domain Layer Entities (Order, Escrow, Payment)
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- Value Objects (Money, PlatformFee)
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- Repository Interfaces & Implementations
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- Payment Gateway Services (VNPay, MoMo, ZaloPay)
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- Command & Query Handlers
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- Controllers & DTOs
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- Test Files (15 suites)
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---
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### 3. **Security Checklist** (ACTION ITEMS)
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📝 File: `PAYMENT_SECURITY_CHECKLIST.md`
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- 15 major security items to verify
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- Detailed checklists for each item
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- Attack scenarios to test
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- Recommended actions prioritized by severity
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**Best for:** Security testing, implementation checklist, audit trail
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**Priority Levels:**
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- 🔴 **HIGHEST PRIORITY** (5 items)
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- 🟠 **HIGH PRIORITY** (4 items)
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- 🟡 **MEDIUM PRIORITY** (3 items)
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- 🟢 **LOWER PRIORITY** (3 items)
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---
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## 🚨 Critical Findings Summary
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### Immediate Action Required
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#### 1. ❌ **No Distributed Lock on Escrow Operations**
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- **Files:** `hold-escrow.handler.ts`, `release-escrow.handler.ts`
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- **Risk:** Race conditions with concurrent requests
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- **Impact:** Financial data corruption, duplicate operations
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- **Fix:** Implement Redis distributed lock (2-3 hours)
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#### 2. ⚠️ **Atomic Update Issue Between Order & Escrow**
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- **Files:** Command handlers doing sequential DB updates
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- **Risk:** State desynchronization between entities
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- **Impact:** MEDIUM - Potential order/escrow mismatch
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- **Fix:** Database transactions or verify atomicity
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#### 3. ✅ **Strong Callback Signature Verification** (GOOD)
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- All 3 providers: VNPay (SHA512), MoMo/ZaloPay (SHA256)
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- Uses `crypto.timingSafeEqual()` for constant-time comparison
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- No timing attack vulnerabilities detected
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### Not Yet Verified
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- Database constraint implementation
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- Secrets management & rotation
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- Error message information disclosure
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- Refund business logic validation
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---
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## 📊 Security Metrics
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| Metric | Status | Priority |
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|--------|--------|----------|
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| Callback HMAC verification | ✅ GOOD | - |
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| Idempotency protection | ✅ GOOD | - |
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| Authorization & auth guards | ✅ GOOD | - |
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| Amount validation | ✅ GOOD | - |
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| Rate limiting | ✅ GOOD | - |
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| **Distributed locking** | ❌ MISSING | 🔴 CRITICAL |
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| **Atomic order/escrow updates** | ⚠️ NEEDS REVIEW | 🟠 HIGH |
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| **Database constraints** | ⚠️ UNVERIFIED | 🟠 HIGH |
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| **Secrets encryption** | ⚠️ UNVERIFIED | 🟡 MEDIUM |
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| **Error disclosure** | ⚠️ UNVERIFIED | 🟡 MEDIUM |
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---
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## 🎯 How to Use These Documents
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### For Security Team Lead
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1. Read: **Executive Summary** (5 min)
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2. Review: **Security Checklist** - CRITICAL section (20 min)
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3. Assign: Tests for attack scenarios (see checklist)
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4. Timeline: Critical fixes before production (1-2 weeks)
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### For Security Code Reviewer
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1. Read: **Executive Summary** (5 min)
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2. Study: **File Inventory** - focus on files listed as "HIGHEST PRIORITY"
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3. Use: **Checklist** - verify each point in the code
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4. Document: Findings in audit report
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### For Developers Implementing Fixes
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1. Review: **Checklist** - find your assigned item
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2. Check: **File Inventory** for background on related components
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3. Implement: Following the detailed checklist items
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4. Test: Using attack scenarios provided in checklist
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### For Project Manager
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1. Read: **Executive Summary** (5 min)
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2. Note: Recommended actions with time estimates
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3. Plan: Task scheduling (Critical: 2 weeks, High: 1 month)
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4. Track: Using action items in checklist
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---
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## 🔍 Key Files to Focus On
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### Absolute Must Review
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1. `infrastructure/services/vnpay.service.ts` - Callback signature verification
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2. `infrastructure/services/momo.service.ts` - Callback signature verification
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3. `infrastructure/services/zalopay.service.ts` - Callback signature verification
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4. `application/commands/handle-callback/handle-callback.handler.ts` - Idempotency
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5. `application/commands/hold-escrow/hold-escrow.handler.ts` - **ADD REDIS LOCK**
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6. `application/commands/release-escrow/release-escrow.handler.ts` - **ADD REDIS LOCK**
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### Important to Review
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7. `domain/entities/order.entity.ts` - State machine
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8. `domain/entities/escrow.entity.ts` - State machine
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9. `infrastructure/repositories/prisma-payment.repository.ts` - Atomic updates
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10. `presentation/controllers/payments.controller.ts` - Rate limiting
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---
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## 🧪 Attack Scenarios to Test
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All test scenarios detailed in **PAYMENT_SECURITY_CHECKLIST.md**:
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1. **Callback Flooding** - 1000 callbacks/sec
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2. **Replay Attack** - Resend old successful callback
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3. **Concurrent Escrow Release** - Release twice simultaneously
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4. **Forged Callback** - Invalid HMAC signature
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5. **Order/Escrow Desync** - Different states between entities
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6. **Integer Overflow** - Max amount edge cases
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7. **Authorization Bypass** - IDOR access to other user's orders
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8. **Double Refund** - Refund twice
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---
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## 📋 Recommended Action Plan
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### Phase 1: CRITICAL (Week 1-2)
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- [ ] Implement Redis distributed lock for escrow operations
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- [ ] Verify database constraints implementation
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- [ ] Code review of callback handlers
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- [ ] Audit error messages for information disclosure
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### Phase 2: HIGH (Week 2-4)
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- [ ] Add integration tests for race conditions
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- [ ] Verify secrets management (env vars, rotation)
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- [ ] Security audit of refund authorization
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- [ ] Comprehensive test suite
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### Phase 3: MEDIUM (Month 2)
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- [ ] Audit logging implementation
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- [ ] Create incident response playbook
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- [ ] Document webhook behavior
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- [ ] Set up monitoring/alerting
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### Phase 4: NICE-TO-HAVE
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- [ ] Field-level encryption for sensitive data
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- [ ] Webhook signature monitoring
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- [ ] Advanced audit trail features
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---
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## 📞 Questions?
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For questions about:
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- **File inventory:** See PAYMENT_MODULE_SECURITY_REVIEW.md
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- **Specific checks:** See PAYMENT_SECURITY_CHECKLIST.md
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- **Quick overview:** See PAYMENT_REVIEW_EXECUTIVE_SUMMARY.txt
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---
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## 📝 Audit Trail
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- **Created:** April 13, 2026
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- **Review Scope:** /apps/api/src/modules/payments/
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- **Files Analyzed:** 102 files
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- **Documents Generated:** 3 (Plus this index)
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- **Total Documentation:** ~900 lines
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- **Status:** Ready for security team review
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---
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## File Locations (Project Root)
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```
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goodgo-platform-ai/
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├── PAYMENT_REVIEW_EXECUTIVE_SUMMARY.txt ← START HERE
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├── PAYMENT_MODULE_SECURITY_REVIEW.md ← DETAILED REFERENCE
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├── PAYMENT_SECURITY_CHECKLIST.md ← ACTION ITEMS
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├── README_SECURITY_REVIEW.md ← THIS FILE
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└── apps/api/src/modules/payments/
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├── domain/
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├── infrastructure/
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├── application/
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└── presentation/
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```
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---
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Generated with comprehensive analysis of the GoodGo Platform payment module.
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