---
title: Validate mTLS Certificates Before Auth
impact: CRITICAL
impactDescription: ensures mutual authentication between services
tags: mtls, certificates, authentication, service-mesh, security
---

## Validate mTLS Certificates Before Auth

This rule ensures high quality and security in Python and PySpark applications.

**Implementation Guidance:**
- Follow standard Python best practices (PEP 8)
- Use type hints for better clarity
- For PySpark, prefer DataFrame API over SQL strings where possible
- Ensure proper resource management (using \`with\` statements)