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Access control

Azimuth allows access to platform types to be restricted on a per-platform type and per-tenant basis, allowing different platform types to be made available to different tenants as required.

By default, all of the platform types are available to all tenants.

Warning

Any restrictions that are applied after platforms have already been created do not result in existing platforms being deleted.

However the creation of new platforms will be restricted to the available platform types, and platforms deployed using platform types that are subsequently restricted will be limited to the delete action only.

Annotations

Access control is implemented using annotations that are applied to instances of the clustertemplates.azimuth.stackhpc.com, apptemplates.azimuth.stackhpc.com and clustertypes.caas.azimuth.stackhpc.com resources for Kubernetes cluster templates, Kubernetes apps and CaaS cluster types respectively.

The annotations are the same for all platform types, and the following annotations are respected, in order of precedence:

  • acl.azimuth.stackhpc.com/deny-list
    A comma-separated list of tenancy IDs that are not allowed to use the platform type.
  • acl.azimuth.stackhpc.com/allow-list
    A comma-separated list of tenancy IDs that are allowed to use the platform type.
  • acl.azimuth.stackhpc.com/deny-regex
    A regex where matching tenancy names are not allowed to use the platform type.
  • acl.azimuth.stackhpc.com/allow-regex
    A regex where matching tenancy names are allowed to use the platform type.

In particular, the precedence order means that, for example:

  • A tenancy whose name matches the allow-regex but whose ID is in the deny-list is not able to use the platform type.
  • Similarly, a tenancy whose name matches the deny-regex but whose ID is in the allow-list is allowed to use the platform type.
  • A tenancy whose ID is in both the allow-list and deny-list is not allowed to use the platform type.

No annotations means allow

If no access control annotations are present, then that platform type is available to all tenants.

Deny-by-default when allow annotations are present

The presence of at least one allow annotation triggers a deny-by-default policy, where tenants not matching an allow annotation are denied.

Built-in platform types

azimuth-ops supports a number of variables that can be used to apply access controls to the built-in platform types.

The following variables allow default access controls to be set for all built-in platform types:

environments/my-site/inventory/group_vars/all/variables.yml
# List of denied tenancy IDs
platforms_tenancy_deny_list:
  - "<id1>"
  - "<id2>"
# List of allowed tenancy IDs
platforms_tenancy_allow_list:
  - "<id3>"
  - "<id4>"
# Regex pattern to deny tenancies by name
platforms_tenancy_deny_regex: "dev$"  # Deny any tenancy whose name ends with 'dev'
# Regex pattern to allow tenancies by name
platforms_tenancy_allow_regex: ".*"  # Allow all tenancies by default

These can be overridden for specific platform types if required:

environments/my-site/inventory/group_vars/all/variables.yml
# The following apply to all Kubernetes cluster templates
azimuth_capi_operator_cluster_template_tenancy_deny_list:
azimuth_capi_operator_cluster_template_tenancy_allow_list:
azimuth_capi_operator_cluster_template_tenancy_deny_regex:
azimuth_capi_operator_cluster_template_tenancy_allow_regex:

# Each Kubernetes app has specific variables
#   Replace 'jupyterhub' with the required app template
azimuth_capi_operator_app_templates_jupyterhub_tenancy_deny_list:
azimuth_capi_operator_app_templates_jupyterhub_tenancy_allow_list:
azimuth_capi_operator_app_templates_jupyterhub_tenancy_deny_regex:
azimuth_capi_operator_app_templates_jupyterhub_tenancy_allow_regex:

# Each CaaS cluster type has specific variables
#   Replace 'slurm' with the required cluster type
azimuth_caas_stackhpc_slurm_appliance_tenancy_deny_list:
azimuth_caas_stackhpc_slurm_appliance_tenancy_allow_list:
azimuth_caas_stackhpc_slurm_appliance_tenancy_deny_regex:
azimuth_caas_stackhpc_slurm_appliance_tenancy_allow_regex:
Last update: April 9, 2024
Created: April 9, 2024