Admin-less operating system
HoloLens 2 minimizes the surface area for privilege escalation by disabling support for the Administrators group and limiting all third-party UWP application code to only execute as standard users within the AppContainer sandbox. This code is only granted access to those resources protected by capabilities explicitly manifested in the application for an unelevated user in addition to resources accessible to all AppContainers. These application capabilities continue to have the three-tiered classification model:
Windows components can also leverage the AppContainer sandbox through System UWPs. To learn more about Universal Windows Platform (UWP), see UWP documentation. Additionally, Windows components with greater privilege reduction needs (like browser content pages or parsers) use the Less Privileged AppContainer (LPAC) sandbox, which cuts off access to the set of resources accessible to all AppContainers.
Finally, the execution of specific device-wide operations, such as joining the device to a tenant or user management, is only permitted for “device owners”. This group is populated by users on the device through one of the following steps:
- The first user on the device is always designated an Owner.
For Azure AD Users, the exception to this rule is that if the device is Azure AD joined via Autopilot or bulk Azure AD enrollment, which uses a non-real user. In this case, the first AAD user to sign into the device may not be made device owner automatically unless that user has the "global administrator" or "device administrator" role assigned in Azure portal. For more information, see the note below.
- When a user is promoted to be an Owner from the Settings UX by another Owner on the device.
- If the device owner is no longer available (leaves the company) and the device is Azure AD joined, the Tenant Admin can change the device owner to a new user in Azure portal. Global Administrators and Device Administrators of an Azure AD tenant are implicitly signed in as Owners on the device without requiring either of the previous steps.
IT administrators can manage what apps can access through Privacy policies.
To understand more about who is made a device owner on an Azure AD joined device, see “Assign Local Admin” documentation (but read ‘local admin’ as ‘device owner’ since admin does not exist on HoloLens).
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