Security Measures

Implemented Security Features

Authentication & Authorization

• ✅ Password strength validation (min 8 chars, uppercase, lowercase, digit)
• ✅ Bcrypt password hashing with automatic salt
• ✅ JWT tokens with expiration and issued-at timestamps
• ✅ Constant-time password comparison to prevent timing attacks
• ✅ Token structure validation (sub claim required)
• ✅ User ownership verification on all document operations

Input Validation

• ✅ File type validation via extension and magic bytes
• ✅ File size limits enforced
• ✅ Page count limits enforced
• ✅ Empty file rejection
• ✅ Filename sanitization (path traversal prevention)
• ✅ Email validation via Pydantic EmailStr
• ✅ UUID validation for all ID parameters

Security Headers

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

Error Handling

• ✅ Generic error messages (no internal details exposed)
• ✅ Graceful degradation for service unavailability
• ✅ Proper HTTP status codes
• ✅ No stack traces in production responses

Data Protection

• ✅ User data isolation (ownership checks)
• ✅ Secure file storage with user-scoped paths
• ✅ Database connection pooling with async support
• ✅ Environment-based configuration (no hardcoded secrets)

Infrastructure

• ✅ CORS middleware (configure allowed origins in production)
• ✅ GZip compression
• ✅ Async database operations
• ✅ Background task isolation

Configuration Requirements

Required Environment Variables

# Generate a secure SECRET_KEY (at least 32 characters)
SECRET_KEY=$(openssl rand -hex 32)

# Password policy
MIN_PASSWORD_LENGTH=8
MAX_PASSWORD_LENGTH=128
REQUIRE_PASSWORD_UPPERCASE=true
REQUIRE_PASSWORD_LOWERCASE=true
REQUIRE_PASSWORD_DIGIT=true

# Rate limiting
RATE_LIMIT_PER_MINUTE=10

# Token expiration
ACCESS_TOKEN_EXPIRE_MINUTES=60

Production Checklist

Before Deployment

• Change SECRET_KEY from default value
• Update DATABASE_URL with production credentials
• Configure CORS allowed_origins (remove "*")
• Enable TrustedHostMiddleware with production domains
• Disable /docs endpoint (set docs_url=None)
• Set up HTTPS/TLS certificates
• Configure rate limiting middleware
• Set up monitoring and alerting
• Enable database connection encryption
• Configure MinIO with MINIO_SECURE=true
• Set up backup strategy for database and files
• Review and harden PostgreSQL configuration
• Implement request logging (without sensitive data)

Recommended Additional Measures

• Add rate limiting per IP/user (e.g., slowapi)
• Implement account lockout after failed login attempts
• Add email verification for signup
• Implement password reset flow
• Add audit logging for sensitive operations
• Set up Web Application Firewall (WAF)
• Implement IP whitelisting for admin operations
• Add request size limits at reverse proxy level
• Set up DDoS protection
• Implement session management with refresh tokens
• Add 2FA support
• Regular security audits and penetration testing

Known Limitations (MVP)

• No rate limiting middleware (implement before production)
• No account lockout mechanism
• No email verification
• No password reset functionality
• No audit logging
• CORS allows all origins (must restrict in production)
• No request body size limits at application level
• No IP-based blocking

Reporting Security Issues

If you discover a security vulnerability, please email security@example.com with:

• Description of the vulnerability
• Steps to reproduce
• Potential impact
• Suggested fix (if any)

Do not open public issues for security vulnerabilities.