Delete SafetyNetHooks.java

/*

 * Copyright (C) 2022 The Android Open Source 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.safetynet;

import java.lang.reflect.Field;

import java.util.Arrays;

import android.app.Application;

import android.os.Build;

import android.util.Log;

public final class SafetyNetHooks {

    private static final String TAG = "SafetyNetHooks";

    private static final String GMS_PACKAGE_NAME = "com.google.android.gms";

    private static final String DOCKMANAGER_PACKAGE_NAME = "com.google.android.apps.nest.dockmanager.app";

    private static final String SPOOFED_MODEL = "Pixel 2";

    private static final String SPOOFED_DEVICE_PRODUCT = "walleye";

    private static final String SPOOFED_FINGERPRINT = "google/walleye/walleye:8.1.0/OPM1.171019.011/4448085:user/release-keys";

    private static final String SPOOFED_TYPE_DOCKMANAGER = "userdebug";

    private static volatile boolean sIsGms = false;

    private static void setBuildField(String key, String value) {

        try {

            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 fake Build." + key, e);

        }

    }

    public static void init(Application app) {

        if (GMS_PACKAGE_NAME.equals(app.getPackageName())) {

            sIsGms = true;

            setBuildField("MODEL", SPOOFED_MODEL);

            setBuildField("DEVICE", SPOOFED_DEVICE_PRODUCT);

            setBuildField("PRODUCT", SPOOFED_DEVICE_PRODUCT);

            setBuildField("FINGERPRINT", SPOOFED_FINGERPRINT);

        } else if (DOCKMANAGER_PACKAGE_NAME.equals(app.getPackageName())) {

            setBuildField("TYPE", SPOOFED_TYPE_DOCKMANAGER);

        }

    }

    private static boolean isCallerSafetyNet() {

        return Arrays.stream(Thread.currentThread().getStackTrace())

                .anyMatch(elem -> elem.getClassName().contains("DroidGuard"));

    }

    public static void onEngineGetCertificateChain() {

        // Check stack for SafetyNet

        if (sIsGms && isCallerSafetyNet()) {

            throw new UnsupportedOperationException();

        }

    }

}