In OpenStack, Keystone is the Identity service responsible for authentication and authorization. A core Keystone concept is that permissions are not usually granted directly to a user; instead, users are assigned one or more roles, and those roles are associated with a project, domain, or system scope. OpenStack’s official Keystone documentation states that the Identity service assigns roles to users, and a user can have different roles in different projects. It also explains that default roles such as admin, member, and reader are used to control what actions a user can perform. This means the statement is correct: Keystone users are assigned roles, and those roles determine their permissions.

This is also consistent with Huawei Cloud’s identity and permission model, where permissions are controlled through assigned authorization policies and identities use tokens containing identity and permission information when accessing services. In practical Huawei Cloud Stack and OpenStack-based environments, role-based access control is the standard method for defining what a user is allowed to do. Therefore, the correct answer is TRUE .