Disallow usb access to camera and mic devices if global privacy toggle is active

Note that this will not prevent currently running apps from accessing
usb devies to which a connection has already been established.
Removed isCameraDevicePresent() as this has been implemented as well in
UsbDevice#getHasVideoCapture().

Bug: 189915399
Test: Install nExt Camera - USB app, verify that camera is not accessible when camera privacy toggle is disabled.
Change-Id: Ie60adfe9fc667d883ad4a6b8d7582a4bc17d1549

services/usb/java/com/android/server/usb/UsbUserPermissionManager.java

@@ -25,12 +25,12 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
+import android.hardware.SensorPrivacyManager.Sensors;
+import android.hardware.SensorPrivacyManagerInternal;
 import android.hardware.usb.AccessoryFilter;
 import android.hardware.usb.DeviceFilter;
 import android.hardware.usb.UsbAccessory;
-import android.hardware.usb.UsbConstants;
 import android.hardware.usb.UsbDevice;
-import android.hardware.usb.UsbInterface;
 import android.hardware.usb.UsbManager;
 import android.os.AsyncTask;
 import android.os.Binder;
@@ -52,9 +52,9 @@ import android.util.TypedXmlSerializer;
 import android.util.Xml;
 
 import com.android.internal.annotations.GuardedBy;
-import com.android.internal.util.FastXmlSerializer;
 import com.android.internal.util.XmlUtils;
 import com.android.internal.util.dump.DualDumpOutputStream;
+import com.android.server.LocalServices;
 
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
@@ -64,7 +64,6 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
 
 /**
  * UsbUserPermissionManager manages usb device or accessory access permissions.
@@ -110,19 +109,20 @@ class UsbUserPermissionManager {
      */
     @GuardedBy("mLock")
     private boolean mIsCopyPermissionsScheduled;
+    private final SensorPrivacyManagerInternal mSensorPrivacyMgrInternal;
 
     UsbUserPermissionManager(@NonNull Context context,
             @NonNull UsbUserSettingsManager usbUserSettingsManager) {
         mContext = context;
         mUser = context.getUser();
         mUsbUserSettingsManager = usbUserSettingsManager;
+        mSensorPrivacyMgrInternal = LocalServices.getService(SensorPrivacyManagerInternal.class);
         mDisablePermissionDialogs = context.getResources().getBoolean(
                 com.android.internal.R.bool.config_disableUsbPermissionDialogs);
 
         mPermissionsFile = new AtomicFile(new File(
                 Environment.getUserSystemDirectory(mUser.getIdentifier()),
                 "usb_permissions.xml"), "usb-permissions");
-
         synchronized (mLock) {
             readPermissionsLocked();
         }
@@ -195,11 +195,27 @@ class UsbUserPermissionManager {
      */
     boolean hasPermission(@NonNull UsbDevice device, @NonNull String packageName, int pid,
             int uid) {
-        if (isCameraDevicePresent(device)) {
-            if (!isCameraPermissionGranted(packageName, pid, uid)) {
+        if (device.getHasVideoCapture()) {
+            boolean isCameraPrivacyEnabled = mSensorPrivacyMgrInternal.isSensorPrivacyEnabled(
+                    UserHandle.getUserId(uid), Sensors.CAMERA);
+            if (DEBUG) {
+                Slog.d(TAG, "isCameraPrivacyEnabled: " + isCameraPrivacyEnabled);
+            }
+            if (isCameraPrivacyEnabled || !isCameraPermissionGranted(packageName, pid, uid)) {
                 return false;
             }
         }
+        // Only check for microphone privacy and not RECORD_AUDIO permission, because access to usb
+        // camera device with audio recording capabilities may still be granted with a warning
+        if (device.getHasAudioCapture() && mSensorPrivacyMgrInternal.isSensorPrivacyEnabled(
+                UserHandle.getUserId(uid), Sensors.MICROPHONE)) {
+            if (DEBUG) {
+                Slog.d(TAG,
+                        "Access to device with audio recording capabilities denied because "
+                                + "microphone privacy is enabled.");
+            }
+            return false;
+        }
         synchronized (mLock) {
             if (uid == Process.SYSTEM_UID || mDisablePermissionDialogs) {
                 return true;
@@ -698,7 +714,10 @@ class UsbUserPermissionManager {
             }
             return;
         }
-        if (isCameraDevicePresent(device)) {
+        // If the app doesn't have camera permission do not request permission to the USB device.
+        // Note that if the USB camera also has a microphone, a warning will be shown to the user if
+        // the app doesn't have RECORD_AUDIO permission.
+        if (device.getHasVideoCapture()) {
             if (!isCameraPermissionGranted(packageName, pid, uid)) {
                 intent.putExtra(UsbManager.EXTRA_DEVICE, device);
                 intent.putExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false);
@@ -733,27 +752,4 @@ class UsbUserPermissionManager {
         requestPermissionDialog(null, accessory,
                 mUsbUserSettingsManager.canBeDefault(accessory, packageName), packageName, pi, uid);
     }
-
-    /**
-     * Check whether a particular device or any of its interfaces
-     * is of class VIDEO.
-     *
-     * @param device The device that needs to get scanned
-     * @return True in case a VIDEO device or interface is present,
-     * False otherwise.
-     */
-    private boolean isCameraDevicePresent(UsbDevice device) {
-        if (device.getDeviceClass() == UsbConstants.USB_CLASS_VIDEO) {
-            return true;
-        }
-
-        for (int i = 0; i < device.getInterfaceCount(); i++) {
-            UsbInterface iface = device.getInterface(i);
-            if (iface.getInterfaceClass() == UsbConstants.USB_CLASS_VIDEO) {
-                return true;
-            }
-        }
-
-        return false;
-    }
 }