gmscompat: add scoped recoverable keystore permission + recovery keystore cleanup on GmsCore data clears - #428
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Let the GmsCompat package flag grant RECOVER_KEYSTORE_GMSCORE to Play services and accept it only for the account keychain RecoveryController methods used for setup, sync, generated keys, status, snapshots and restore sessions. We keep remaining functions like direct raw key import and remote lockscreen validation behind the existing privileged permissions.
RecoverableKeyStore identifies recovery agent state by Android user ID and recovery agent UID. It removes that state when an Android user is removed, but has no equivalent cleanup for app data removal. On the stock OS, Package Manager restores GmsCore's saved app ID when updates are uninstalled, so it normally keeps the same UID. On GrapheneOS, sandboxed GmsCore can be fully uninstalled; a later installation is a fresh install and may receive a new UID. Also, clearing its storage keeps the UID but discards the app state associated with its recoverable keystore entries. After successful app data removal for GmsCore installed as a user app, remove its database rows, snapshot, listener and pending snapshot state, recovery sessions and application keys. Preserve system apps and DELETE_KEEP_DATA flows such as package replacement and archiving. Delete agent-owned rows by user ID and UID using each table's schema contract and one transaction. Enumerate the internal alias prefix so restored application keys without database rows are included, and serialize cleanup with pending key sync work. Keep the per-user platform keys because they are shared by all recovery agents for the user.
Verify LockSettings serializes cleanup with key sync work and removes sessions, listeners, snapshots, internal Android Keystore aliases and only the matching recovery agent database rows. Keep regression coverage for the existing removed Android user cleanup path, including its database-backed key enumeration and user-wide database removal. Test: atest FrameworksServicesTests:ApplicationKeyStorageTest Test: atest FrameworksServicesTests:RecoverableKeyStoreManagerTest Test: atest FrameworksServicesTests:RecoverySnapshotListenersStorageTest Test: atest FrameworksServicesTests:CleanupManagerTest Test: atest FrameworksServicesTests:RecoverableKeyStoreDbTest
… Find Hub When RECOVER_KEYSTORE_GMSCORE is not granted, ask GmsCompat to show a notification linking to its recovery keystore permission screen. Require a visible com.google AccountManager account before notifying during passkey use. The same FIDO activities are used during initial Google account sign-in, before Play services has an account whose account keychain could use the permission. If the account query fails, skip the optional notification.
Derive the LSKF hash immediately before it is used to protect the recovery key and zeroize it afterward instead of retaining it while recoverable keys are loaded and encrypted. Destroy secrets when an explicitly closed recovery session is removed. Zeroization clears only the current movable array and cannot erase copies made by the runtime. Trailing underscores mark owned locals that must not be used after zeroization. After key sync enters the cryptographic path, run best effort garbage collection once the task releases its credential to shorten retention of unreachable Java objects and associated native contexts. This does not guarantee that stale heap copies or native temporary data are overwritten. Test: atest FrameworksServicesTests:KeySyncTaskTest Test: atest FrameworksServicesTests:RecoverySessionStorageTest
Allow GmsCompat to inform users if Bluetooth auto-off is on, since it might affect Find Hub functionality that they might want.
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