1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.net.wifi; 18 19 import android.os.Build; 20 import android.os.ServiceManager; 21 import android.os.SystemProperties; 22 import android.security.legacykeystore.ILegacyKeystore; 23 import android.util.Log; 24 25 import com.android.internal.net.ConnectivityBlobStore; 26 27 /** 28 * Database blob store for Wifi. 29 * @hide 30 */ 31 public class WifiBlobStore extends ConnectivityBlobStore { 32 private static final String TAG = "WifiBlobStore"; 33 private static final String DB_NAME = "WifiBlobStore.db"; 34 private static final String LEGACY_KEYSTORE_SERVICE_NAME = "android.security.legacykeystore"; 35 private static final boolean sIsVendorApiLevelGreaterThanT = isVendorApiLevelGreaterThanT(); 36 private static WifiBlobStore sInstance; WifiBlobStore()37 private WifiBlobStore() { 38 super(DB_NAME); 39 } 40 isVendorApiLevelGreaterThanT()41 private static boolean isVendorApiLevelGreaterThanT() { 42 int androidT = Build.VERSION_CODES.TIRAMISU; // redefine to avoid errorprone build issue 43 String[] vendorApiLevelProps = { 44 "ro.board.api_level", "ro.board.first_api_level", "ro.vndk.version"}; 45 for (String propertyName : vendorApiLevelProps) { 46 int apiLevel = SystemProperties.getInt(propertyName, -1); 47 if (apiLevel != -1) { 48 Log.i(TAG, "Retrieved API level property, value=" + apiLevel); 49 return apiLevel > androidT; 50 } 51 } 52 // If none of the properties are defined, we are using the current API level (> V) 53 Log.i(TAG, "No API level properties are defined"); 54 return true; 55 } 56 57 /** 58 * Check whether supplicant can access values stored in WifiBlobstore. 59 * 60 * NonStandardCertCallback was added in Android U, allowing supplicant to access the 61 * WifiKeystore APIs, which access WifiBlobstore. Previously, supplicant used 62 * WifiKeystoreHalConnector to access values stored in Legacy Keystore. 63 * 64 * @hide 65 */ supplicantCanAccessBlobstore()66 public static boolean supplicantCanAccessBlobstore() { 67 return sIsVendorApiLevelGreaterThanT; 68 } 69 70 /** Returns an instance of WifiBlobStore. */ getInstance()71 public static WifiBlobStore getInstance() { 72 if (sInstance == null) { 73 sInstance = new WifiBlobStore(); 74 } 75 return sInstance; 76 } 77 78 /** Returns an interface to access the Legacy Keystore service. */ getLegacyKeystore()79 public static ILegacyKeystore getLegacyKeystore() { 80 return ILegacyKeystore.Stub.asInterface( 81 ServiceManager.checkService(LEGACY_KEYSTORE_SERVICE_NAME)); 82 } 83 } 84