Check permissions and carrier privilege in notifyActiveDataSubIdChanged (9e9ed187) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/TelephonyRegistry.java

+21 −7

Original line number	Diff line number	Diff line
		@@ -79,6 +79,7 @@ import java.util.List;
		import java.util.Map;
		import java.util.NoSuchElementException;
		import java.util.OptionalInt;
		import java.util.stream.Collectors;

		/**
		* Since phone process can be restarted, this class provides a centralized place
		@@ -260,8 +261,7 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
		static final int ENFORCE_PHONE_STATE_PERMISSION_MASK =
		PhoneStateListener.LISTEN_CALL_FORWARDING_INDICATOR
		\| PhoneStateListener.LISTEN_MESSAGE_WAITING_INDICATOR
		\| PhoneStateListener.LISTEN_EMERGENCY_NUMBER_LIST
		\| PhoneStateListener.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE;
		\| PhoneStateListener.LISTEN_EMERGENCY_NUMBER_LIST;

		static final int PRECISE_PHONE_STATE_PERMISSION_MASK =
		PhoneStateListener.LISTEN_PRECISE_CALL_STATE \|
		@@ -827,7 +827,10 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
		}
		}
		if ((events & PhoneStateListener
		.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE) != 0) {
		.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE) != 0
		&& TelephonyPermissions.checkReadPhoneStateOnAnyActiveSub(
		r.context, r.callerPid, r.callerUid, r.callingPackage,
		"listen_active_data_subid_change")) {
		try {
		r.callback.onActiveDataSubIdChanged(mActiveDataSubId);
		} catch (RemoteException ex) {
		@@ -1769,12 +1772,23 @@ public class TelephonyRegistry extends ITelephonyRegistry.Stub {
		log("notifyActiveDataSubIdChanged: activeDataSubId=" + activeDataSubId);
		}

		// Create a copy to prevent the IPC call while checking carrier privilege under the lock.
		List<Record> copiedRecords;
		synchronized (mRecords) {
		copiedRecords = new ArrayList<>(mRecords);
		}
		mActiveDataSubId = activeDataSubId;

		for (Record r : mRecords) {
		if (r.matchPhoneStateListenerEvent(
		PhoneStateListener.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE)) {
		// Filter the record that does not listen to this change or does not have the permission.
		copiedRecords = copiedRecords.stream().filter(r -> r.matchPhoneStateListenerEvent(
		PhoneStateListener.LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE)
		&& TelephonyPermissions.checkReadPhoneStateOnAnyActiveSub(
		mContext, r.callerPid, r.callerUid, r.callingPackage,
		"notifyActiveDataSubIdChanged")).collect(Collectors.toCollection(ArrayList::new));

		synchronized (mRecords) {
		for (Record r : copiedRecords) {
		if (mRecords.contains(r)) {
		try {
		r.callback.onActiveDataSubIdChanged(activeDataSubId);
		} catch (RemoteException ex) {

telephony/java/android/telephony/PhoneStateListener.java

+5 −2

Original line number	Diff line number	Diff line
		@@ -297,8 +297,11 @@ public class PhoneStateListener {
		* it could be the current active opportunistic subscription in use, or the
		* subscription user selected as default data subscription in DSDS mode.
		*
		* Requires Permission: {@link android.Manifest.permission#READ_PHONE_STATE
		* READ_PHONE_STATE}
		* Requires Permission: No permission is required to listen, but notification requires
		* {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE} or the calling
		* app has carrier privileges (see {@link TelephonyManager#hasCarrierPrivileges})
		* on any active subscription.
		*
		* @see #onActiveDataSubscriptionIdChanged
		*/
		public static final int LISTEN_ACTIVE_DATA_SUBSCRIPTION_ID_CHANGE = 0x00400000;

telephony/java/com/android/internal/telephony/TelephonyPermissions.java

+57 −0

Original line number	Diff line number	Diff line
		@@ -161,6 +161,63 @@ public final class TelephonyPermissions {
		}
		}

		// We have READ_PHONE_STATE permission, so return true as long as the AppOps bit hasn't been
		// revoked.
		AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
		return appOps.noteOp(AppOpsManager.OP_READ_PHONE_STATE, uid, callingPackage)
		== AppOpsManager.MODE_ALLOWED;
		}

		/**
		* Check whether the app with the given pid/uid can read phone state, or has carrier
		* privileges on any active subscription.
		*
		* <p>If the app does not have carrier privilege, this method will return {@code false} instead
		* of throwing a SecurityException. Therefore, the callers cannot tell the difference
		* between M+ apps which declare the runtime permission but do not have it, and pre-M apps
		* which declare the static permission but had access revoked via AppOps. Apps in the former
		* category expect SecurityExceptions; apps in the latter don't. So this method is suitable for
		* use only if the behavior in both scenarios is meant to be identical.
		*
		* @return {@code true} if the app can read phone state or has carrier privilege;
		* {@code false} otherwise.
		*/
		public static boolean checkReadPhoneStateOnAnyActiveSub(
		Context context, int pid, int uid, String callingPackage, String message) {
		return checkReadPhoneStateOnAnyActiveSub(context, TELEPHONY_SUPPLIER, pid, uid,
		callingPackage, message);
		}

		@VisibleForTesting
		public static boolean checkReadPhoneStateOnAnyActiveSub(
		Context context, Supplier<ITelephony> telephonySupplier, int pid, int uid,
		String callingPackage, String message) {
		try {
		context.enforcePermission(
		android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, pid, uid, message);

		// SKIP checking for run-time permission since caller has PRIVILEGED permission
		return true;
		} catch (SecurityException privilegedPhoneStateException) {
		try {
		context.enforcePermission(
		android.Manifest.permission.READ_PHONE_STATE, pid, uid, message);
		} catch (SecurityException phoneStateException) {
		SubscriptionManager sm = (SubscriptionManager) context.getSystemService(
		Context.TELEPHONY_SUBSCRIPTION_SERVICE);
		int[] activeSubIds = sm.getActiveSubscriptionIdList();
		for (int activeSubId : activeSubIds) {
		// If we don't have the runtime permission, but do have carrier privileges, that
		// suffices for reading phone state.
		if (getCarrierPrivilegeStatus(telephonySupplier, activeSubId, uid)
		== TelephonyManager.CARRIER_PRIVILEGE_STATUS_HAS_ACCESS) {
		return true;
		}
		}
		return false;
		}
		}

		// We have READ_PHONE_STATE permission, so return true as long as the AppOps bit hasn't been
		// revoked.
		AppOpsManager appOps = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);