Introduce PixelPropsUtils

* That will spoof build fingerprints on some g00gle apps
* Thanks to @kdrag0n for the original idea at
  ProtonAOSP/android_frameworks_base@5a54bfd

@neobuddy89:
* Squash subsequent changes by jhenrique09

Signed-off-by: jhenrique09 <[email protected]>
Co-authored-by: Danny Lin <[email protected]>
Signed-off-by: Pranav Vashi <[email protected]>
Signed-off-by: Pranav Vashi <[email protected]>

Author: 2 people

core/java/com/android/internal/os/Zygote.java

@@ -35,6 +35,8 @@
 import android.system.Os;
 import android.util.Log;
 
+import com.android.internal.util.crdroid.PixelPropsUtils;
+
 import dalvik.annotation.optimization.FastNative;
 import dalvik.system.ZygoteHooks;
 
@@ -794,6 +796,9 @@ static void setAppProcessName(ZygoteArguments args, String loggingTag) {
         } else {
             Log.w(loggingTag, "Unable to set package name.");
         }
+
+        // Set pixel props
+        PixelPropsUtils.setProps(args.mPackageName);
     }
 
     private static final String USAP_ERROR_PREFIX = "Invalid command to USAP: ";

core/java/com/android/internal/util/crdroid/PixelPropsUtils.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2020 The Pixel Experience Project
+ *               2021 crDroid Android Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.internal.util.crdroid;
+
+import android.os.Build;
+import android.util.Log;
+
+import java.util.Arrays;
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+
+public class PixelPropsUtils {
+
+    private static final String TAG = PixelPropsUtils.class.getSimpleName();
+    private static final boolean DEBUG = false;
+
+    private static final Map<String, Object> propsToChange;
+
+    private static final String[] packagesToChange = {
+        "com.google.android.apps.safetyhub",
+        "com.google.android.apps.turbo",
+        "com.google.android.apps.wallpaper",
+        "com.google.android.apps.maps",
+        "com.google.android.gms",
+        "com.google.android.googlequicksearchbox"
+    };
+
+    static {
+        propsToChange = new HashMap<>();
+        propsToChange.put("BRAND", "google");
+        propsToChange.put("MANUFACTURER", "Google");
+        propsToChange.put("DEVICE", "redfin");
+        propsToChange.put("PRODUCT", "redfin");
+        propsToChange.put("MODEL", "Pixel 5");
+        propsToChange.put("FINGERPRINT", "google/redfin/redfin:11/RQ2A.210305.007/7124944:user/release-keys");
+    }
+
+    public static void setProps(String packageName) {
+        if (packageName == null) {
+            return;
+        }
+        if (Arrays.asList(packagesToChange).contains(packageName)) {
+            if (DEBUG) {
+                Log.d(TAG, "Defining props for: " + packageName);
+            }
+            for (Map.Entry<String, Object> prop : propsToChange.entrySet()) {
+                String key = prop.getKey();
+                Object value = prop.getValue();
+                setPropValue(key, value);
+            }
+        }
+        // Set proper indexing fingerprint
+        if (packageName.equals("com.google.android.settings.intelligence")) {
+            setPropValue("FINGERPRINT", Build.DATE);
+        }
+    }
+
+    private static void setPropValue(String key, Object value) {
+        try {
+            if (DEBUG) {
+                Log.d(TAG, "Defining prop " + key + " to " + value.toString());
+            }
+            Field field = Build.class.getDeclaredField(key);
+            field.setAccessible(true);
+            field.set(null, value);
+            field.setAccessible(false);
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            Log.e(TAG, "Failed to set prop " + key, e);
+        }
+    }
+}