Role-based access control
Role Based Access Control (RBAC) feature in XenServer allows you to assign users, roles, and permissions to control who has access to your XenServer and what actions they can perform. The XenServer RBAC system maps a user (or a group of users) to defined roles (a named set of permissions). The roles have associated XenServer permissions to perform certain operations.
Permissions are not assigned to users directly. Users acquire permissions through roles assigned to them. Therefore, managing individual user permissions becomes a matter of assigning the user to the appropriate role, which simplifies common operations. XenServer maintains a list of authorized users and their roles.
RBAC allows you to restrict which operations different groups of users can perform, reducing the probability of an accident by an inexperienced user.
RBAC also provides an Audit Log feature for compliance and auditing.
RBAC depends on Active Directory for authentication services. Specifically, XenServer keeps a list of authorized users based on Active Directory user and group accounts. As a result, you must join the pool to the domain and add Active Directory accounts before you can assign roles.
The local super user (LSU), or root, is a special user account used for system administration and has all rights or permissions. The local super user is the default account at installation in XenServer. The LSU is authenticated through XenServer and not through an external authentication service. If the external authentication service fails, the LSU can still log in and manage the system. The LSU can always access the XenServer physical host through SSH.
The following section describes the standard process for implementing RBAC and assigning a user or group a role:
Join the domain. For more information, see Enabling external authentication on a pool.
Add an Active Directory user or group to the pool. This becomes a subject. For more information, see To add a subject to RBAC.
Assign (or change) the subject’s RBAC role. For more information, see To assign an RBAC role to a subject.