Comprehensive security audit and hardening

[agramms]

🔒 Objective

Conduct a comprehensive security audit of the JDPI client and implement security hardening measures to protect sensitive financial data.

🚨 Security Context

• Financial data handling: PIX payments and sensitive transaction data
• OAuth2 tokens: Secure token storage and transmission
• Multi-tenant usage: Potential shared environments
• Regulatory compliance: Financial industry standards

🔍 Security Audit Areas

1. Token Security

• Storage encryption: AES-256-GCM implementation review
• Key management: Encryption key generation and rotation
• Token transmission: HTTPS enforcement and TLS validation
• Token expiration: Proper token lifecycle management
• Cache security: Secure token caching across backends

2. Input Validation

• Request sanitization: SQL injection prevention
• Parameter validation: Input format and range validation
• JSON parsing: Secure JSON deserialization
• Unicode handling: Proper encoding validation

3. Network Security

• TLS configuration: Minimum TLS 1.2, certificate validation
• Certificate pinning: HTTPS certificate validation
• Hostname verification: Proper SSL/TLS verification
• Request headers: Secure header handling

4. Data Protection

• Sensitive data logging: Ensure no credentials in logs
• Memory protection: Secure memory handling for secrets
• Data persistence: Secure storage configurations
• Data transmission: End-to-end encryption validation

🏆 Security Compliance Checklist

• Zero high-severity security vulnerabilities
• Comprehensive security test coverage
• Automated security scanning in CI/CD
• Security monitoring and alerting functional
• Security documentation complete
• Regular security audit schedule established