A system group is an ID for a group of users (subjects) that roles can be assigned to.
There are two types of system groups in Yandex.Cloud:
allUsers. These groups let you grant public access to your resources, but only for operations that are allowed by the given role.
You can assign any role to the system group, except
Do not assign a system group the
admin role for a catalog or cloud. Otherwise, anyone who knows the folder ID can use Yandex.Cloud at your expense.
allAuthenticatedUsers: All users who passed authentication. These are all registered Yandex.Cloud users or service accounts.
For example, you have an OS disk image that you want to share with all Yandex.Cloud users. To do this, assign the
compute.images.user role to the
allAuthenticatedUsers subject for the folder containing the image.
allUsers: Any user. No authentication is required. For example, you don't need to specify the IAM token in an API query.
allUsers is only supported in Object Storage with ACL-based access management, in Container Registry, and in Cloud Functions.
For other services, assigning a role to the
allUsers group is the equivalent to assigning the role to