Service-to-Service Authentication and Authorization

 

Service-to-Service Authentication and Authorization

Why?

  • Don’t just trust any request that hits your internal endpoints (even on cPanel!). You want zero trust even between your own microservices.

  • Prevents accidental or malicious calls from rogue services, or even compromised infrastructure.

How?

  • You already have JWT/OIDC for users. Reuse this for service-to-service auth:

    • Every service uses its own JWT when calling another service.

    • Each service validates the JWT (issuer, audience, expiry).

    • This is already mostly in place in your ecosystem!

Further:

  • Add scopes/roles to your JWTs to define what a given service can do.

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