tree 84bddd461afacd7e0011c6b344b04253a037a1de
parent b7e3fd80e52cd7a3607f36044d6c3b94bb985b27
author Jeff Davidson <jpd@google.com> 1449713090 -0800
committer Jeff Davidson <jpd@google.com> 1450142197 -0800

Relax permissions around NetworkStatsManager APIs.

Currently, access to network usage history and statistics requires a
signature|privileged permission, an AppOps bit (associated with the
PACKAGE_USAGE_STATS permission), or device/profile ownership. Once
access is granted via one of these mechanisms, it generally applies to
any UID running in the same user as the caller.

This CL expands access as follows:

-Any app can access its own usage history with no extra requirements.
-Carrier-privileged applications can access usage history for the
entire device.
-Device owners can access per-UID breakdowns for usage. Previously
they could access the summary for the whole device, but not the
individual breakdowns.

We simplify the permission model by defining three access levels -
DEFAULT (own app only), USER (all apps in the same user), and DEVICE
(all apps on the device), and propagate these levels throughout.

Finally, this CL fixes an apparent bug in
NetworkStatsSerice#hasAppOpsPermissions - if the AppOp bit was in
MODE_DEFAULT, hasAppOpsPermission would always return false instead of
falling back to the PackageManager permission check.

Bug: 25812859
Bug: 25813856
Change-Id: Ic96e0776e2a4215a400163872acea1ededfaced9