Church-Music/legacy-site/documentation/md-files/SECURITY_AUDIT.md

""" Security audit results and recommendations for Church Music Database

Date: December 15, 2025 Audit Type: Full-stack security and code quality review

CRITICAL ISSUES FIXED

Backend (Python/Flask)

✅ 1. Database Session Leaks - FIXED

• Added try-finally blocks to all endpoints
• Implemented proper session cleanup
• Fixed get_db() function to prevent premature closure

✅ 2. Input Validation - FIXED

• Added length limits on all string inputs (title, artist, name: 500 chars)
• Added file size validation (10MB max)
• Added filename validation to prevent path traversal
• Added query parameter length limits (500 chars)
• Added ID validation for all endpoints

✅ 3. SQL Injection Protection - ENHANCED

• Already using SQLAlchemy ORM (parameterized queries)
• Added input sanitization
• Added validation on filter types in search

✅ 4. Security Headers - ADDED

• X-Content-Type-Options: nosniff
• X-Frame-Options: DENY
• X-XSS-Protection: 1; mode=block
• Strict-Transport-Security (HSTS)
• Server header removal

✅ 5. Request Size Limits - ADDED

• MAX_CONTENT_LENGTH: 16MB
• File upload: 10MB limit
• Prevents DoS attacks

✅ 6. Session Security - ENHANCED

• Secure cookie flags in production
• HTTPOnly flag set
• SameSite=Lax
• Session timeout: 1 hour

✅ 7. Environment Variables - VALIDATED

• Added production checks for SECRET_KEY and POSTGRESQL_URI
• Created .env.example template
• Added warning for default passwords

Database (PostgreSQL)

✅ 8. Indexes Added for Performance

• idx_profile_name on profiles(name)
• idx_song_title, idx_song_artist, idx_song_band on songs
• idx_plan_date, idx_plan_profile on plans
• Composite indexes on junction tables

✅ 9. Unique Constraints Added

• uq_plan_song (prevents duplicate songs in plans)
• uq_profile_song (prevents duplicate profile-song associations)
• uq_profile_song_key (one key per profile-song)

✅ 10. Cascade Deletes Configured

• ON DELETE CASCADE for ProfileSong, ProfileSongKey, PlanSong
• ON DELETE SET NULL for Plan.profile_id
• Prevents orphaned records

✅ 11. Password Validation - ADDED

• Checks for default password in production
• Raises error if 'your_password' found in POSTGRESQL_URI

Frontend (React)

✅ 12. Error Handling - IMPROVED

• Better error logging in API settings parsing
• Automatic corrupted settings cleanup
• Graceful fallbacks throughout

REMAINING RECOMMENDATIONS

High Priority

⚠️ 1. Authentication Enhancement

• Current: Client-side password hash (easily bypassed)
• Recommended: JWT tokens with backend authentication
• Recommended: OAuth2 or SAML for enterprise

⚠️ 2. Rate Limiting

• Install flask-limiter: pip install flask-limiter
• Add rate limits to prevent brute force attacks
• Suggested: 100 requests per minute per IP

⚠️ 3. HTTPS/TLS Configuration

• Currently using HTTP
• Production MUST use HTTPS
• Configure reverse proxy (nginx) with Let's Encrypt certificates

⚠️ 4. Content Security Policy (CSP)

• Add CSP headers to prevent XSS attacks
• Restrict script sources to same-origin

Medium Priority

⚠️ 5. Code Organization

• App.js is 7579 lines (too large)
• Recommended: Split into smaller components
• Implement proper component structure

⚠️ 6. API Versioning

• Add /api/v1/ prefix to all endpoints
• Allows backward compatibility during updates

⚠️ 7. Logging Enhancement

• Implement structured logging (JSON format)
• Add request ID tracking
• Log security events (failed auth, suspicious activity)

⚠️ 8. Database Backup Strategy

• Implement automated daily backups
• Test restore procedures
• Store backups offsite

Low Priority

⚠️ 9. Performance Optimization

• Add Redis caching for frequently accessed data
• Implement pagination for large result sets
• Add database query caching

⚠️ 10. Monitoring

• Add application monitoring (Sentry, New Relic)
• Database performance monitoring
• Uptime monitoring

DEPLOYMENT CHECKLIST

Before deploying to production: □ Change all default passwords □ Set SECRET_KEY environment variable □ Enable HTTPS/TLS □ Configure firewall rules □ Set up database backups □ Run migrate_database.py to add indexes □ Test all endpoints □ Review logs for errors □ Set FLASK_ENV=production □ Disable debug mode □ Configure reverse proxy (nginx/Apache)

MAINTENANCE TASKS

Weekly:

• Review application logs
• Check database size
• Monitor failed login attempts

Monthly:

• Update dependencies (pip, npm)
• Review and rotate secrets
• Test backup restore procedure

Quarterly:

• Security audit
• Performance review
• Dependency vulnerability scan

FILES CREATED/MODIFIED

✅ Modified:

• backend/app.py (security fixes, session management)
• backend/postgresql_models.py (indexes, constraints)
• frontend/src/api.js (error handling)

✅ Created:

• .env.example (environment template)
• backend/migrate_database.py (database migration script)
• SECURITY_AUDIT.md (this file)

TESTING COMMANDS

Test backend endpoints

curl http://localhost:8080/api/health

Check database connections

python -c "from backend.postgresql_models import engine; print(engine.connect())"

Run migration

cd backend && python migrate_database.py

Install updated dependencies

cd backend && pip install -r requirements.txt cd frontend && npm install

SUPPORT

For questions or issues, refer to:

• CONFIGURATION_GUIDE.md
• POSTGRESQL_SETUP_COMPLETE.md
• QUICK_REFERENCE.md """