Restricted permission mechanism - framework
This change adds a mechanism for restricting permissions (only runtime
for now), so that an app cannot hold the permission if it is not white
listed. The whitelisting can happen at install or at any later point.
There are three whitelists: system: OS managed with default grants
and role holders being on it; upgrade: only OS puts on this list
apps when upgrading from a pre to post restriction permission database
version and OS and installer on record can remove; installer: only
the installer on record can add and remove (and the system of course).
Added a permission policy service that sits on top of permissions
and app ops and is responsible to sync between permissions and app
ops when there is an interdependecy in any direction.
Added versioning to the runtime permissions database to allow operations
that need to be done once on upgrade such as adding all permissions held
by apps pre upgrade to the upgrade whitelist if the new permisison version
inctroduces a new restricted permission. The upgrade logic is in the
permission controller and we will eventually put the default grants there.
NOTE: This change is reacting to a VP feedback for how we would handle
SMS/CallLog restriction as we pivoted from role based approach to roles
for things the user would understand plus whitelist for everything else.
This would also help us roll out softly the storage permisison as there
is too much churm coming from developer feedback.
Exempt-From-Owner-Approval: trivial change due to APi adjustment
Test: atest CtsAppSecurityHostTestCases:android.appsecurity.cts.PermissionsHostTest
Test: atest CtsPermissionTestCases
Test: atest CtsPermission2TestCases
Test: atest RoleManagerTestCases