Restrict Google advertising ID

Fixes #731

CHANGELOG.md

@@ -4,6 +4,7 @@ Changelog
 **Next release**
 
 * Restrict access to sensors ([issue](https://github.com/M66B/XPrivacy/issues/723))
+* Restrict Google advertising ID ([issue](https://github.com/M66B/XPrivacy/issues/731))
 
 **Version 1.10.4 BETA**
 

README.md

@@ -147,6 +147,7 @@ For easy usage, data is restricted by category:
 	* return a fake host name
 	* return a fake Google services framework ID
 	* return file not found for folder /proc
+	* Return a fake Google advertising ID
 * Internet
 	* revoke access to the internet
 	* return fake disconnected state

assets/meta.xml

@@ -49,7 +49,8 @@
     <Hook restriction="identification" method="getString" permissions="" sdk="14" />
     <Hook restriction="identification" method="GservicesProvider" dangerous="true" permissions="READ_GSERVICES" sdk="14" />
     <Hook restriction="identification" method="SERIAL" permissions="" sdk="14" />
-
+    <Hook restriction="identification" method="AdvertisingId" permissions="" sdk="14" />
+
     <Hook restriction="internet" method="getAllByName" permissions="INTERNET" sdk="14" />
     <Hook restriction="internet" method="getByAddress" permissions="INTERNET" sdk="14" />
     <Hook restriction="internet" method="getByName" permissions="INTERNET" sdk="14" />

src/biz/bokhorst/xprivacy/PrivacyManager.java

@@ -838,6 +838,9 @@ public static Object getDefacedProp(int uid, String name) {
 			return getSetting(null, null, uid, cSettingUa,
 					"Mozilla/5.0 (Linux; U; Android; en-us) AppleWebKit/999+ (KHTML, like Gecko) Safari/999.9", true);
 
+		if (name.equals("AdvertisingId"))
+			return "DEFACE00-0000-0000-0000-000000000000";
+
 		// Fallback
 		Util.log(null, Log.WARN, "Fallback value name=" + name);
 		return cDeface;

src/biz/bokhorst/xprivacy/XAdvertisingIdClientInfo.java

@@ -0,0 +1,53 @@
+package biz.bokhorst.xprivacy;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import android.os.Binder;
+import android.util.Log;
+
+import de.robv.android.xposed.XC_MethodHook.MethodHookParam;
+
+public class XAdvertisingIdClientInfo extends XHook {
+	private Methods mMethod;
+
+	private XAdvertisingIdClientInfo(Methods method, String restrictionName, String specifier) {
+		super(restrictionName, method.name(), specifier);
+		mMethod = method;
+	}
+
+	public String getClassName() {
+		return "com.google.android.gms.ads.identifier.AdvertisingIdClient$Info";
+	}
+
+	// @formatter:off
+
+	// String getId()
+	// http://developer.android.com/reference/com/google/android/gms/ads/identifier/AdvertisingIdClient.Info.html
+
+	// @formatter:on
+
+	private enum Methods {
+		getId
+	};
+
+	public static List<XHook> getInstances() {
+		List<XHook> listHook = new ArrayList<XHook>();
+		listHook.add(new XAdvertisingIdClientInfo(Methods.getId, PrivacyManager.cIdentification, "AdvertisingId"));
+		return listHook;
+	}
+
+	@Override
+	protected void before(MethodHookParam param) throws Throwable {
+		if (mMethod == Methods.getId) {
+			if (isRestricted(param))
+				param.setResult(PrivacyManager.getDefacedProp(Binder.getCallingUid(), "AdvertisingId"));
+		} else
+			Util.log(this, Log.WARN, "Unknown method=" + param.method.getName());
+	}
+
+	@Override
+	protected void after(MethodHookParam param) throws Throwable {
+		// Do nothing
+	}
+}

src/biz/bokhorst/xprivacy/XPrivacy.java

@@ -151,6 +151,13 @@ public void handleLoadPackage(final LoadPackageParam lpparam) throws Throwable {
 		// Providers
 		hookAll(XContentProvider.getInstances(lpparam.packageName), lpparam.classLoader);
 
+		// Advertising Id
+		try {
+			Class.forName("com.google.android.gms.ads.identifier.AdvertisingIdClient$Info", false, lpparam.classLoader);
+			hookAll(XAdvertisingIdClientInfo.getInstances(), lpparam.classLoader);
+		} catch (Throwable ex) {
+		}
+
 		// Google auth
 		try {
 			Class.forName("com.google.android.gms.auth.GoogleAuthUtil", false, lpparam.classLoader);