Role Based Access Control
Starting with version 6 access to your resources is controlled by Role Based Access Control (RBAC).
Every identity wishing to create/read/update/delete any resource must have the correct privileges.
It is possible for authenticated users to infer names of resources to which they are not authorized. Avoid personally identifiable information or other high-risk data in names.
To quickly get started using roles head over to the bundles section and download the Default roles bundle.
Identities, Roles and Permissions
Identities can have one or more roles. Every role has a collection of permissions. Other than users there are also webhooks or the git integration, for a full list of identities please refer to the flow API overview.
To assign a role to a user, the user has to be created. For more on how to create and manage users refer to User & Role Management.
A permission for a role consists of three basic attributes:
- project: Any of your projects
- Table type: Any cloudomation resource
- operation:
CREATE/READ/UPDATE/DELETE
All of these can be left unassigned, which means that they won't restrict access based on them.
To restrict access to only one project a permission could be created with only the project set and all other attributes left unset. This way all operations on all resources are allowed for the specific project.
Similarly if a permission is created with only the DELETE operation set it would allow deleting
of every record in all projects.
All identities have implicit permissions to read and write the own record. For example, a user can read and update the own user record without the need for an explicit permission to do so.
It is not possible to modify the organization admin role to prevent you from locking yourself out
of the system.
The built-in organization admin role has one permission entry, where every attribute is left unset.
Creating Roles
There are a few ways to create roles and assign permissions to them:
User Interface
To create a role click on the top right of the user interface and choose Manage Users & Roles,
in the Roles tab click on the button Add role. After the role has been created it can be
given permissions by clicking the Add button in the permissions section.
Flow API
To create a role via the flow API the method System.role can be used
role = System.role('my-new-role').save()
Adding permissions to this role is similarly easy by calling role.add_permission
# my-new-role allows reading of files in every project
role.add_permission(project=None, record=flow_api.file.File, operation=flow_api.enums.Operation.READ)
# view all permissions of my-new-role
this.log(permissions=list(role.get_permissions()))
Assigning roles to identities
roles can be given to identities by three means:
User Interface
By clicking on the role-management button in the top right corner of an identity.
Add a role to an identity
There is a checkbox propagate more on this later.
Flow API
The resources identity and role both have the methods add_role and add_identity
respectively. They both have a keyword argument propagate which enables or disables
role inheritance.
import flow_api
def handler(system: flow_api.System, this: flow_api.Execution):
my_webhook = system.webhook('my-existing-webhook')
# create a role which the webhook needs to run
my_role = system.role('my-new-role')
my_role.add_permission(project=None, record=flow_api.flow.Flow, operation=flow_api.enum.Operation.READ)
my_role.add_permission(project=None, record=flow_api.execution.Execution, operation=None)
my_webhook.add_role(my_role, propagate=False)
return this.success('added role to webhook')
Role Inheritance
Previous sections have already hinted at the concept of role inheritance.
Since executions, webhooks, schedules and all other identities can perform
every action a user can on the platform, it is important to be able to limit
their access. An identity can drop some or all rights it currently has by
either doing so explicitly or
implicitly using the propagate flag.
Every identity ↔ role
mapping has an attribute: propagate. Any identity created by another will
have all the roles of the creating identity where this propagate flag is True.
The propagate flag will also be set to True for all child identities which have
obtained a role via this manner.
A user might have two roles:
user,propagate=False: All permissions the user needs for day-to-day operations.automation,propagate=True: All permissions the started executions need.
When the user starts a flow script (ie. creates an execution) it will only have the automation role.
Overriding the default inheritance model
There might arise situations where the default inheritance might not be viable in all situations. Providing the desired roles explicitly is a way around this limitation.
resources created directly by the user can be modified after being created in the UI.
The flow API provides a keyword argument roles on all function and method calls which create
identities. It accepts a list of dictionaries with they keys name and propagate, where name
should contain the name of the role to propagate.
It is not possible to propagate roles which the calling identity doesn't have.
import flow_api
def handler(system: flow_api.System, this: flow_api.Execution):
# call `my-flow` and only give it `my-flow_s-role`.
# if this execution doesn't have the `my-flow_s-role` but
# permission to create roles and identities we can do the following
# to allow inheriting the role:
this.add_role('my-flow_s-role', propagate=False)
this.flow(
'my-flow',
roles=[dict(name='my-flow_s-role', propagate=False)],
)
return this.success('all done')
Patterns
Webhooks and Schedules
Since webhooks and schedules are also identities they will give roles to executions created by them.
To work such identities need to have permissions to read all resources required by themself. A webhook will need to read the flow which gets executed and be able to create executions. The started execution might require a totally different set of permissions.
This can be modeled by giving the webhook two roles, one for the webhook itself
and another one for the created execution(s), where the webhook role has propagate
set to False.
Add two roles to the webhook
It is possible to render a webhook, or for that matter any identity, unusable by giving it insufficient permissions. Care should be taken that they have all required permissions during configuration.
Connections
If connections reference vault secrets the identity creating these must also have read permission on the vault configuration.