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Mtls configuration

Skill FridrichMethod/awesome-skills/skills/mtls-configuration

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Install
npx -y skills add FridrichMethod/awesome-skills --skill mtls-configuration

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Configure mutual TLS (mTLS) for zero-trust service-to-service communication. Use when implementing zero-trust networking, certificate management, or securing internal service communication.

SKILL.md

2.6 KB, 534 tokens by cl100k_base, as published. Nobody here has run it

mTLS Configuration

Comprehensive guide to implementing mutual TLS for zero-trust service mesh communication.

When to Use This Skill

  • Implementing zero-trust networking
  • Securing service-to-service communication
  • Certificate rotation and management
  • Debugging TLS handshake issues
  • Compliance requirements (PCI-DSS, HIPAA)
  • Multi-cluster secure communication

Core Concepts

1. mTLS Flow

┌─────────┐                              ┌─────────┐
│ Service │                              │ Service │
│    A    │                              │    B    │
└────┬────┘                              └────┬────┘
     │                                        │
┌────┴────┐      TLS Handshake          ┌────┴────┐
│  Proxy  │◄───────────────────────────►│  Proxy  │
│(Sidecar)│  1. ClientHello             │(Sidecar)│
│         │  2. ServerHello + Cert      │         │
│         │  3. Client Cert             │         │
│         │  4. Verify Both Certs       │         │
│         │  5. Encrypted Channel       │         │
└─────────┘                              └─────────┘

2. Certificate Hierarchy

Root CA (Self-signed, long-lived)
    │
    ├── Intermediate CA (Cluster-level)
    │       │
    │       ├── Workload Cert (Service A)
    │       └── Workload Cert (Service B)
    │
    └── Intermediate CA (Multi-cluster)
            │
            └── Cross-cluster certs

Templates and detailed worked examples

Full template library and detailed worked examples live in references/details.md. Read that file when you need the concrete templates.

Best Practices

Do's

  • Start with PERMISSIVE - Migrate gradually to STRICT
  • Monitor certificate expiry - Set up alerts
  • Use short-lived certs - 24h or less for workloads
  • Rotate CA periodically - Plan for CA rotation
  • Log TLS errors - For debugging and audit

Don'ts

  • Don't disable mTLS - For convenience in production
  • Don't ignore cert expiry - Automate rotation
  • Don't use self-signed certs - Use proper CA hierarchy
  • Don't skip verification - Verify the full chain

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