Senior LevelWeb Security & Cyber Defense
How does a Service Mesh (Istio, Linkerd) automate mTLS encryption and authorization policies across microservices?
❓ Interview Prompt: Explain Service Mesh architecture, Envoy sidecar proxies, automated mTLS, Istio `PeerAuthentication`, and `AuthorizationPolicy` definitions.
A Service Mesh (Istio, Linkerd) manages microservice-to-microservice communication via Envoy sidecar proxies running alongside containers:
Automated mTLS & Authorization:
1
Auto mTLS: Envoy sidecars intercept all inter-service traffic, automatically encrypting and authenticating calls with short-lived mTLS certificates without code modifications!
2
Declarative Authorization: Apply granular Istio 'AuthorizationPolicy' rules enforcing namespace and SPIFFE ID access permissions.
Code Implementation Example
yaml
# Istio AuthorizationPolicy restricting access to Payment Service
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
name: payment-policy
namespace: payments
spec:
selector:
matchLabels:
app: payment-service
action: ALLOW
rules:
- from:
- source:
principals: ["cluster.local/ns/checkout/sa/checkout-service"]💡Istio AuthorizationPolicy restricting Payment Service access to Checkout Service SPIFFE identity.
🎯 Interview Key Takeaway
Deploy a Service Mesh (Istio) to automate mTLS encryption and enforce declarative zero-trust authorization policies across microservices.
#Service Mesh#Istio#mTLS#Microservices#Senior
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