Haifeng Chen created HADOOP-18610:
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Summary: ABFS OAuth2 Token Provider to support Azure Workload
Identity for AKS
Key: HADOOP-18610
URL: https://issues.apache.org/jira/browse/HADOOP-18610
Project: Hadoop Common
Issue Type: Improvement
Components: tools
Affects Versions: 3.3.4
Reporter: Haifeng Chen
In Jan 2023, Microsoft Azure AKS replaced its original pod-managed identity
with with [Azure Active Directory (Azure AD) workload
identities|https://learn.microsoft.com/en-us/azure/active-directory/develop/workload-identities-overview]
(preview), which integrate with the Kubernetes native capabilities to federate
with any external identity providers. This approach is simpler to use and
deploy.
Refer to for more details:
[https://learn.microsoft.com/en-us/azure/aks/workload-identity-overview.]
The basic use scenario is to access Azure cloud resources (such as cloud
storage) from Kubernetes (such as AKS) workload using Azure managed identity
federated with Kubernetes service account. The credential environment variables
in pod projected by Azure AD workload identity are like following:
AZURE_AUTHORITY_HOST: (Injected by the webhook,
https://login.microsoftonline.com/)
AZURE_CLIENT_ID: (Injected by the webhook)
AZURE_TENANT_ID: (Injected by the webhook)
AZURE_FEDERATED_TOKEN_FILE: (Injected by the webhook,
/var/run/secrets/azure/tokens/azure-identity-token)
The token in the file pointed by AZURE_FEDERATED_TOKEN_FILE is a JWT (JASON Web
Token) client assertion token which we can use to request to
AZURE_AUTHORITY_HOST (url is AZURE_AUTHORITY_HOST + tenantId +
"/oauth2/v2.0/token") for a AD token which can be used to directly access the
Azure cloud resources.
This approach is very common and similar among cloud providers such as AWS and
GCP. Hadoop AWS integration has WebIdentityTokenCredentialProvider to handle
the same case.
The existing MsiTokenProvider can only handle the managed identity associated
with Azure VM instance. We need to implement a WorkloadIdentityTokenProvider
which handle Azure Workload Identity case. For this, we need to add one method
(getTokenUsingJWTAssertion)
in AzureADAuthenticator which will be used by WorkloadIdentityTokenProvider.
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