Authorizations for Upgrading and Downgrading Labels

The authorization to change a label to one that dominates it is called the Upgrade File Label authorization. The authorization to change a label to one that it dominates is called the Downgrade File Label authorization. For definitions for these authorizations, see /etc/security/auth_attr.

Options for Restricting Users to a Single Label

If the system is configured to run with only a single label, all non-administrative user accounts on that system are restricted to work at that single label. In such systems, the clearance for every user's account would logically need be set to be equal to the account's minimum label.

In systems running with multiple sensitivity labels, any account may be restricted to work at a single label if the security administrator role sets the account's clearance equal to its minimum label.

When the security administrator role has configured an account with a account label range that includes multiple labels, the user can voluntarily restrict a working session to a single label, which is explained in the next section.