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Don’t Make
Me
Impersonate
My Identity
Lightning Talk
Cynthia Thomas
linkedin.com/in/cynthia-thomas, @_techcet_
GKE Security, Google Cloud
Kubernetes Pods and their identities
- In Kubernetes, Pods are given a distinct identity
within a Kubernetes cluster
- How? Through a Service Account: typically an
account type for non-humans
- Pods are always given Service Accounts by default or
configured
How to get Pods to talk to Cloud Resources
Options:
1. Export credentials and mount as a Kubernetes
secret in the Pod at runtime
2. Use the worker node/VM identity credential
3. Use Workload Identity Federation
Cloud provider
K8s Cluster
K8s Worker Nodes
K8s Worker Nodes
K8s Worker Nodes
Namespace foo
Pod Pod
K8s Control Plane
kube-API server
Workload Identity Federation at work
Step 2: Secured
communication
Cloud IAM
Cloud API
Step 1: Trust
Established
Blog: Kubernetes token support for OIDC
Before After
Create Kubernetes namespace Create Kubernetes namespace
Create Kubernetes Service Account
(KSA)
Create Kubernetes Service Account
(KSA)
Create Google Service Account Not needed
Configure KSA to impersonate GSA Not needed
Annotate KSA with the GSA so GKE
knows the link
Not needed
Bind role to Google Service Account
(GSA)
Bind role directly to KSA
SA
Impersonation
Just say no to impersonation
- Dont worry about managing secrets
- Dont worry about identity impersonation
- Federate identities - supports OIDC/SAML and now X.509
certificates with SPIFFE
Don’t make me impersonate my identity
Be more secure with Workload Identity Federation!

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CNSCon 2024 Lightning Talk: Don’t Make Me Impersonate My Identity

  • 1. Don’t Make Me Impersonate My Identity Lightning Talk Cynthia Thomas linkedin.com/in/cynthia-thomas, @_techcet_ GKE Security, Google Cloud
  • 2. Kubernetes Pods and their identities - In Kubernetes, Pods are given a distinct identity within a Kubernetes cluster - How? Through a Service Account: typically an account type for non-humans - Pods are always given Service Accounts by default or configured
  • 3. How to get Pods to talk to Cloud Resources Options: 1. Export credentials and mount as a Kubernetes secret in the Pod at runtime 2. Use the worker node/VM identity credential 3. Use Workload Identity Federation
  • 4. Cloud provider K8s Cluster K8s Worker Nodes K8s Worker Nodes K8s Worker Nodes Namespace foo Pod Pod K8s Control Plane kube-API server Workload Identity Federation at work Step 2: Secured communication Cloud IAM Cloud API Step 1: Trust Established Blog: Kubernetes token support for OIDC
  • 5. Before After Create Kubernetes namespace Create Kubernetes namespace Create Kubernetes Service Account (KSA) Create Kubernetes Service Account (KSA) Create Google Service Account Not needed Configure KSA to impersonate GSA Not needed Annotate KSA with the GSA so GKE knows the link Not needed Bind role to Google Service Account (GSA) Bind role directly to KSA SA Impersonation Just say no to impersonation
  • 6. - Dont worry about managing secrets - Dont worry about identity impersonation - Federate identities - supports OIDC/SAML and now X.509 certificates with SPIFFE Don’t make me impersonate my identity Be more secure with Workload Identity Federation!