step-ca
Run a private certificate authority with step-ca. Use when a user asks to issue internal TLS certificates, set up mTLS between services, create a private PKI, or manage certificates for internal infrastructure.
What this skill does
# step-ca (Smallstep)
## Overview
step-ca is a private certificate authority for issuing TLS certificates to internal services. Automated certificate issuance, renewal, and revocation — like Let's Encrypt but for private infrastructure.
## Instructions
### Step 1: Initialize CA
```bash
brew install step
step ca init --name "Internal CA" --dns localhost --address :443 --provisioner admin
```
### Step 2: Issue Certificates
```bash
step-ca $(step path)/config/ca.json # start CA server
step ca certificate api.internal api.crt api.key # issue cert
```
### Step 3: Auto-Renewal
```bash
step ca renew --daemon api.crt api.key # auto-renews before expiry
```
### Step 4: mTLS Between Services
```typescript
// server.ts — Node.js server with mutual TLS
import https from 'https'
import fs from 'fs'
const server = https.createServer({
cert: fs.readFileSync('server.crt'),
key: fs.readFileSync('server.key'),
ca: fs.readFileSync('root_ca.crt'),
requestCert: true, // require client certificate
rejectUnauthorized: true,
}, (req, res) => {
const clientCN = req.socket.getPeerCertificate().subject.CN
res.end('Hello ' + clientCN)
})
```
## Guidelines
- Use step-ca for internal services, Let's Encrypt for public-facing.
- Short-lived certs (24h) with auto-renewal are more secure than long-lived ones.
- ACME protocol support — works with Certbot, Caddy.
- Integrates with Kubernetes cert-manager for automatic pod certificates.
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