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Add support for Azure Workload Identity #12

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Add support for Azure Workload Identity #12

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34 changes: 27 additions & 7 deletions prometrix/auth.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,9 @@ def azure_authorization(cls, config: PrometheusConfig) -> bool:
if not isinstance(config, AzurePrometheusConfig):
return False
return (config.azure_client_id != "" and config.azure_tenant_id != "") and (
config.azure_client_secret != "" or config.azure_use_managed_id != ""
config.azure_client_secret != "" or # Service Principal Auth
config.azure_use_managed_id != "" or # Managed Identity Auth
config.azure_use_workload_id != "" # Workload Identity Auth
)

@classmethod
Expand Down Expand Up @@ -48,15 +50,33 @@ def _get_azure_metadata_endpoint(cls, config: PrometheusConfig):
@no_type_check
@classmethod
def _post_azure_token_endpoint(cls, config: PrometheusConfig):
return requests.post(
url=config.azure_token_endpoint,
headers={"Content-Type": "application/x-www-form-urlencoded"},
data={
# Try Azure Workload Identity
with open("/var/run/secrets/azure/tokens/azure-identity-token", "r") as token_file:
token = token_file.read()
data = {
"grant_type": "client_credentials",
"client_assertion_type": "urn:ietf:params:oauth:client-assertion-type:jwt-bearer",
"client_assertion": token,
"client_id": config.azure_client_id,
"scope": f"{config.azure_resource}/.default",
}
# Fallback to Azure Service Principal
if not token:
if config.azure_use_workload_id:
return {
"ok": False,
"reason": f"Could not open token file from {token_file}",
}
data = {
"grant_type": "client_credentials",
"client_id": config.azure_client_id,
"client_secret": config.azure_client_secret,
"resource": config.azure_resource,
},
}
return requests.post(
url=config.azure_token_endpoint,
headers={"Content-Type": "application/x-www-form-urlencoded"},
data=data,
)

@classmethod
Expand All @@ -67,7 +87,7 @@ def request_new_token(cls, config: PrometheusConfig) -> bool:
try:
if config.azure_use_managed_id:
res = cls._get_azure_metadata_endpoint(config)
else:
else: # Service Principal and Workload Identity
res = cls._post_azure_token_endpoint(config)
except Exception:
logging.exception(
Expand Down
1 change: 1 addition & 0 deletions prometrix/models/prometheus_config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ class AzurePrometheusConfig(PrometheusConfig):
azure_metadata_endpoint: str
azure_token_endpoint: str
azure_use_managed_id: Optional[str]
azure_use_workload_id: Optional[str]
azure_client_id: Optional[str]
azure_tenant_id: Optional[str]
azure_client_secret: Optional[str]
Expand Down