Hybrid-KeyVault-Python-Manage-Secrets-Cert-Based-Service-Principal

Dernière mise à jour : 30/01/2019
Modifier sur GitHub

This sample demonstrates how to manage key vaults and secrets in AzureStack using the Python SDK with a certificate based service principal authentication.

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Run this sample

  1. If you don't already have it, install Python.

  2. We recommend using a virtual environment to run this example, but it's not mandatory. You can initialize a virtual environment this way:

    pip install virtualenv
    virtualenv mytestenv
    cd mytestenv
    source bin/activate
    
  3. Clone the repository.

    git clone https://github.com/Azure-Samples/Hybrid-KeyVault-Python-Manage-Secrets-Cert-Based-Service-Principal.git
    
  4. Install the dependencies using pip.

    cd Hybrid-KeyVault-Python-Manage-Secrets-Cert-Based-Service-Principal
    pip install -r requirements.txt
    
  5. Create a certificate based service principal to work against AzureStack. Make sure your service principal has contributor/owner role on your subscription.

    • Note the OBJECT_ID and CLIENT_ID of the service principal created from this step. OBJECT_ID is used in the sample to assign access policy for the service principal.
  6. Export these environment variables into your current shell.

    export AZURE_RESOURCE_LOCATION={your resource location}
    export AZURE_TENANT_ID={your tenant id}
    export AZURE_CLIENT_ID={your client id}
    export AZURE_OBJECT_ID={your client's object id}
    export AZURE_CERT_PATH={your service principal cert path}
    export AZURE_SUBSCRIPTION_ID={your subscription id}
    export ARM_ENDPOINT={your AzureStack Resource Manager Endpoint}
    
    • In case of Windows, use 'set ' instead of 'export'.
  7. Run the sample.

    python example.py
    

What is example.py doing?

This sample starts by setting up ResourceManagementClient and KeyVaultManagementClient objects using your subscription and credentials.

# get_Credentials_cert function to get credentials object
def get_credentials_cert(resource_uri=None):
    mystack_cloud = get_cloud_from_metadata_endpoint(
        os.environ['ARM_ENDPOINT'])

    subscription_id = os.environ['AZURE_SUBSCRIPTION_ID']

    # By Default, use AzureStack supported profile
    KnownProfiles.default.use(KnownProfiles.v2018_03_01_hybrid)

    # set default logging level
    logging.basicConfig(level=logging.DEBUG)

    """
    Authenticate using service principal w/ cert.
    """

    cert_file = os.environ['AZURE_CERT_PATH']
    tenant = os.environ['AZURE_TENANT_ID']
    client_id = os.environ['AZURE_CLIENT_ID']

    from OpenSSL.crypto import load_certificate, FILETYPE_PEM
    with open(cert_file, 'r') as file_reader:
        cert_file_string = file_reader.read()
        cert = load_certificate(FILETYPE_PEM, cert_file_string)
        thumbprint = cert.digest("sha1").decode()

    authority_uri, is_adfs = _get_authority_url(
        mystack_cloud, tenant)

    if resource_uri is None:
        resource_uri = mystack_cloud.endpoints.active_directory_resource_id

    context = adal.AuthenticationContext(
        authority_uri, api_version=None, validate_authority=(not is_adfs))

    mgmt_token = context.acquire_token_with_client_certificate(
        resource_uri, client_id, cert_file_string, thumbprint)
    credentials = AADTokenCredentials(mgmt_token, client_id)

    return credentials, subscription_id, mystack_cloud

# Retrieve auth token using service principal credentials
credentials, subscription_id, mystack_cloud = get_credentials_cert()

# Create Keyvault management client using cert based service principal credentials
kv_client = KeyVaultManagementClient(credentials, subscription_id,
                                     base_url=mystack_cloud.endpoints.resource_manager)

# Create Resource Manager client
resource_client = ResourceManagementClient(credentials, subscription_id,
                                           base_url=mystack_cloud.endpoints.resource_manager)

# The resource URI for keyvault needs to be specified to get the auth token for the same
# If you are targeting the Public Azure Cloud, the following vault_resource_uri must be set to 'https://vault.azure.net'
vault_resource_uri = mystack_cloud.endpoints.active_directory_resource_id.replace("management", "vault")
kv_dp_credentials, subscription_id, mystack_cloud = get_credentials_cert(vault_resource_uri)

# Create a keyvault data plane client using the token provider
kv_data_client = KeyVaultClient(kv_dp_credentials)

It registers the subscription for the "Microsoft.KeyVault" namespace and creates a resource group and a storage account where the media services will be managed.

# You MIGHT need to add KeyVault as a valid provider for these credentials
# If so, this operation has to be done only once for each credentials
resource_client.providers.register('Microsoft.KeyVault')

# Create Resource group
print('Create Resource Group')
resource_group_params = {'location': LOCATION}
print_item(resource_client.resource_groups.create_or_update(
    GROUP_NAME, resource_group_params))

Here, the create_or_update method returns a ResourceGroup object after performing the appropriate operation, and the supporting function print_item prints some of its attributes.

Create a key vault

vault = kv_client.vaults.create_or_update(
    GROUP_NAME,
    KV_NAME,
    {
        'location': LOCATION,
        'properties': {
            'sku': {
                'name': 'standard'
            },
            'tenant_id': os.environ['AZURE_TENANT_ID'],
            'access_policies': [{
                'tenant_id': os.environ['AZURE_TENANT_ID'],
                'object_id': os.environ['AZURE_OBJECT_ID'],
                'permissions': {
                    'keys': ['all'],
                    'secrets': ['all'],
                    'certificates':['all']
                }
            }]
        }
    }
)
print_item(vault)

The object ID is unique for a User or an Application. Find this number in the Azure Active Directory blade of the Azure portal: * To find a User's object ID, navigate to "Users and groups" > "All users", search for the user name, and click it. * To find an Application's object ID, search for the application name under "App registrations" and click it.

In either of these cases, you can then find the object ID in the Essentials box.

Create a secret inside the keyvault

secret_bundle = kv_data_client.set_secret(
    vault.properties.vault_uri, 'auth-sample-secret', 'some secret')
print(secret_bundle)

Get secret from keyvault

secret_bundle = kv_data_client.get_secret(
    vault.properties.vault_uri, 'auth-sample-secret', secret_version=KeyVaultId.version_none)
print(secret_bundle)

List key vaults

This code lists some attributes of all available key vaults.

for vault in kv_client.vaults.list():
    print_item(vault)

Delete a key vault

delete_async_operation = resource_client.resource_groups.delete(GROUP_NAME)
delete_async_operation.wait()
print("\nDeleted: {}".format(GROUP_NAME))

Deleting a resource is an asynchronous operation which may take some time, so the object returned from delete represents an operation in progress. Calling wait on it forces the caller to wait until it finishes.