Special case & sanitize exposure notification results am: a79caa3348 (9201df26) · Commits · e / os / android_packages_apps_Bluetooth

res/values/config.xml

+3 −0

Original line number	Diff line number	Diff line
		@@ -114,4 +114,7 @@
		<!-- Flag whether or not to keep polling AG with CLCC for call information every 2 seconds -->
		<bool name="hfp_clcc_poll_during_call">true</bool>

		<!-- Package that is providing the exposure notification service -->
		<string name="exposure_notification_package">com.google.android.gms</string>

		</resources>

src/com/android/bluetooth/gatt/ContextMap.java

+2 −0

Original line number	Diff line number	Diff line
		@@ -107,6 +107,8 @@ import java.util.UUID;
		/** Whether the calling app has the network setup wizard permission */
		boolean mHasScanWithoutLocationPermission;

		boolean mEligibleForSanitizedExposureNotification;

		public List<String> mAssociatedDevices;

		/** Internal callback info queue, waiting to be send on congestion clear */

src/com/android/bluetooth/gatt/GattService.java

+68 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,7 @@ import android.os.ServiceManager;
		import android.os.SystemClock;
		import android.os.UserHandle;
		import android.os.WorkSource;
		import android.provider.Settings;
		import android.util.Log;

		import com.android.bluetooth.BluetoothMetricsProto;
		@@ -185,6 +186,7 @@ public class GattService extends ProfileService {
		private ScanManager mScanManager;
		private AppOpsManager mAppOps;
		private ICompanionDeviceManager mCompanionManager;
		private String mExposureNotificationPackage;

		private static GattService sGattService;

		@@ -207,6 +209,9 @@ public class GattService extends ProfileService {
		if (DBG) {
		Log.d(TAG, "start()");
		}
		mExposureNotificationPackage = getString(R.string.exposure_notification_package);
		Settings.Global.putInt(
		getContentResolver(), "bluetooth_sanitized_exposure_notification_supported", 1);
		initializeNative();
		mAdapter = BluetoothAdapter.getDefaultAdapter();
		mCompanionManager = ICompanionDeviceManager.Stub.asInterface(
		@@ -960,6 +965,56 @@ public class GattService extends ProfileService {
		* Callback functions - CLIENT
		*************************************************************************/

		// EN format defined here:
		// https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
		private static final byte[] EXPOSURE_NOTIFICATION_FLAGS_PREAMBLE = new byte[] {
		// size 2, flag field, flags byte (value is not important)
		(byte) 0x02, (byte) 0x01
		};
		private static final int EXPOSURE_NOTIFICATION_FLAGS_LENGTH = 0x2 + 1;
		private static final byte[] EXPOSURE_NOTIFICATION_PAYLOAD_PREAMBLE = new byte[] {
		// size 3, complete 16 bit UUID, EN UUID
		(byte) 0x03, (byte) 0x03, (byte) 0x6F, (byte) 0xFD,
		// size 23, data for 16 bit UUID, EN UUID
		(byte) 0x17, (byte) 0x16, (byte) 0x6F, (byte) 0xFD,
		// ...payload
		};
		private static final int EXPOSURE_NOTIFICATION_PAYLOAD_LENGTH = 0x03 + 0x17 + 2;

		private static boolean arrayStartsWith(byte[] array, byte[] prefix) {
		if (array.length < prefix.length) {
		return false;
		}
		for (int i = 0; i < prefix.length; i++) {
		if (prefix[i] != array[i]) {
		return false;
		}
		}
		return true;
		}

		ScanResult getSanitizedExposureNotification(ScanResult result) {
		ScanRecord record = result.getScanRecord();
		// Remove the flags part of the payload, if present
		if (record.getBytes().length > EXPOSURE_NOTIFICATION_FLAGS_LENGTH
		&& arrayStartsWith(record.getBytes(), EXPOSURE_NOTIFICATION_FLAGS_PREAMBLE)) {
		record = ScanRecord.parseFromBytes(
		Arrays.copyOfRange(
		record.getBytes(),
		EXPOSURE_NOTIFICATION_FLAGS_LENGTH,
		record.getBytes().length));
		}

		if (record.getBytes().length != EXPOSURE_NOTIFICATION_PAYLOAD_LENGTH) {
		return null;
		}
		if (!arrayStartsWith(record.getBytes(), EXPOSURE_NOTIFICATION_PAYLOAD_PREAMBLE)) {
		return null;
		}

		return new ScanResult(null, 0, 0, 0, 0, 0, result.getRssi(), 0, record, 0);
		}

		void onScanResult(int eventType, int addressType, String address, int primaryPhy,
		int secondaryPhy, int advertisingSid, int txPower, int rssi, int periodicAdvInt,
		byte[] advData) {
		@@ -1027,6 +1082,13 @@ public class GattService extends ProfileService {
		}
		}
		}
		if (!hasPermission && client.eligibleForSanitizedExposureNotification) {
		ScanResult sanitized = getSanitizedExposureNotification(result);
		if (sanitized != null) {
		hasPermission = true;
		result = sanitized;
		}
		}
		if (!hasPermission \|\| !matchesFilters(client, result)) {
		continue;
		}
		@@ -1986,6 +2048,8 @@ public class GattService extends ProfileService {
		final ScanClient scanClient = new ScanClient(scannerId, settings, filters, storages);
		scanClient.userHandle = UserHandle.of(UserHandle.getCallingUserId());
		mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
		scanClient.eligibleForSanitizedExposureNotification =
		callingPackage.equals(mExposureNotificationPackage);
		scanClient.isQApp = Utils.isQApp(this, callingPackage);
		if (scanClient.isQApp) {
		scanClient.hasLocationPermission = Utils.checkCallerHasFineLocation(this, mAppOps,
		@@ -2046,6 +2110,8 @@ public class GattService extends ProfileService {
		ScannerMap.App app = mScannerMap.add(uuid, null, null, piInfo, this);
		app.mUserHandle = UserHandle.of(UserHandle.getCallingUserId());
		mAppOps.checkPackage(Binder.getCallingUid(), callingPackage);
		app.mEligibleForSanitizedExposureNotification =
		callingPackage.equals(mExposureNotificationPackage);
		app.mIsQApp = Utils.isQApp(this, callingPackage);
		try {
		if (app.mIsQApp) {
		@@ -2076,6 +2142,8 @@ public class GattService extends ProfileService {
		scanClient.hasLocationPermission = app.hasLocationPermission;
		scanClient.userHandle = app.mUserHandle;
		scanClient.isQApp = app.mIsQApp;
		scanClient.eligibleForSanitizedExposureNotification =
		app.mEligibleForSanitizedExposureNotification;
		scanClient.hasNetworkSettingsPermission = app.mHasNetworkSettingsPermission;
		scanClient.hasNetworkSetupWizardPermission = app.mHasNetworkSetupWizardPermission;
		scanClient.hasScanWithoutLocationPermission = app.mHasScanWithoutLocationPermission;

src/com/android/bluetooth/gatt/ScanClient.java

+1 −0

Original line number	Diff line number	Diff line
		@@ -44,6 +44,7 @@ import java.util.UUID;
		public boolean hasLocationPermission;
		public UserHandle userHandle;
		public boolean isQApp;
		public boolean eligibleForSanitizedExposureNotification;
		public boolean hasNetworkSettingsPermission;
		public boolean hasNetworkSetupWizardPermission;
		public boolean hasScanWithoutLocationPermission;