[Bug]: Lack of region leads to incorrect STS API call for IRSA credentials.

[Dennor]

Is there an existing issue for this?

• I have searched the existing issues

Affected Resource(s)

• iam.aws.upbound.io/v1beta1 - Role (and others?).

Resource MRs required to reproduce the bug

apiVersion: pkg.crossplane.io/v1beta1
kind: DeploymentRuntimeConfig
metadata:
  name: enable-aws-pod-identity
spec:
  serviceAccountTemplate:
    metadata:
      annotations:
        eks.amazonaws.com/role-arn: arn::some::oidc-provider
---
apiVersion: pkg.crossplane.io/v1
kind: Provider
metadata:
  name: aws-iam
spec:
  package: xpkg.upbound.io/upbound/provider-aws-iam:v1.4.0
  runtimeConfigRef:
    name: enable-aws-pod-identity
---
apiVersion: iam.aws.upbound.io/v1beta1
kind: Role
metadata:
  name: some-role
spec:
  forProvider:
    assumeRolePolicy: |
      ...snip
    inlinePolicy:
    - name: some-policy
      policy: |
        ...snip

Steps to Reproduce

• Create a cluster with IRSA credentials outside of EKS.
• Create an Role resource

What happened?

I've expected the provider to authenticate with STS endpoint like others do. Unfortunately due to the lack of region provider attempts to call STS endpoint without region and fails. It attempts to call sts..amazonaws.com which is clearly wrong.

Relevant Error Output Snippet

Warning  CannotConnectToProvider       9m34s (x29 over 32m)    managed/iam.aws.upbound.io/v1beta1, kind=role  cannot initialize the Terraform plugin SDK async external client: cannot get terraform setup: cache manager failure: cannot retrieve the AWS account ID: GetCallerIdentity query failed: operation error STS: GetCallerIdentity, get identity: get credentials: failed to refresh cached credentials, failed to retrieve credentials, operation error STS: AssumeRoleWithWebIdentity, https response error StatusCode: 0, RequestID: , request send failed, Post "https://sts..amazonaws.com/": dial tcp: lookup sts..amazonaws.com: no such host

Crossplane Version

1.15.2

Provider Version

1.4.0

Kubernetes Version

1.29.4

Kubernetes Distribution

k0s

Additional Info

A simple addition of

  deploymentTemplate:
    spec:
      selector: {}
      template:
        spec:
          containers:
          - name: package-runtime
            env:
            - name: AWS_REGION
              value: eu-central-1

in the DeploymentRuntimeConfig fixes the issue.

[erhancagirici]

hi @Dennor, thanks for reporting this. Could you also provide the YAML output of the provider-aws-iam pod?

IRSA provider config implementation assumes that the provider pod runs on an EKS cluster. EKS injects several extra environment variables on IRSA-enabled pods, like AWS_REGION , AWS_DEFAULT_REGION and AWS_STS_REGIONAL_ENDPOINTS which influence the resulting AWS SDK configuration. See
https://github.com/aws/amazon-eks-pod-identity-webhook?tab=readme-ov-file#aws_default_region-injection for reference

For the kubernetes distribution you use, I am not sure how IRSA-related configuration is injected, e.g. how eks.amazonaws.com/role-arn annotation is handled. I assume that these are not automatically injected by your distribution. Could you specify a bit more about how your environment looks like?