| /* |
| * Copyright (C) 2017 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.settings.wifi; |
| |
| import android.app.admin.DevicePolicyManager; |
| import android.content.ComponentName; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.pm.PackageManager; |
| import android.net.NetworkCapabilities; |
| import android.net.wifi.WifiConfiguration; |
| import android.provider.Settings; |
| import android.text.TextUtils; |
| |
| import com.android.settingslib.wrapper.PackageManagerWrapper; |
| |
| public class WifiUtils { |
| |
| private static final int SSID_ASCII_MIN_LENGTH = 1; |
| private static final int SSID_ASCII_MAX_LENGTH = 32; |
| private static final int PASSWORD_MIN_LENGTH = 8; |
| private static final int PASSWORD_MAX_LENGTH = 63; |
| |
| |
| public static boolean isSSIDTooLong(String ssid) { |
| if (TextUtils.isEmpty(ssid)) { |
| return false; |
| } |
| return ssid.length() > SSID_ASCII_MAX_LENGTH; |
| } |
| |
| public static boolean isSSIDTooShort(String ssid) { |
| if (TextUtils.isEmpty(ssid)) { |
| return true; |
| } |
| return ssid.length() < SSID_ASCII_MIN_LENGTH; |
| } |
| |
| public static boolean isHotspotPasswordValid(String password) { |
| if (TextUtils.isEmpty(password)) { |
| return false; |
| } |
| |
| final int length = password.length(); |
| return length >= PASSWORD_MIN_LENGTH && length <= PASSWORD_MAX_LENGTH; |
| } |
| |
| /** |
| * This method is a stripped and negated version of WifiConfigStore.canModifyNetwork. |
| * @param context Context of caller |
| * @param config The WiFi config. |
| * @return true if Settings cannot modify the config due to lockDown. |
| */ |
| public static boolean isNetworkLockedDown(Context context, WifiConfiguration config) { |
| if (config == null) { |
| return false; |
| } |
| |
| final DevicePolicyManager dpm = |
| (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE); |
| final PackageManagerWrapper pm = new PackageManagerWrapper(context.getPackageManager()); |
| |
| // Check if device has DPM capability. If it has and dpm is still null, then we |
| // treat this case with suspicion and bail out. |
| if (pm.hasSystemFeature(PackageManager.FEATURE_DEVICE_ADMIN) && dpm == null) { |
| return true; |
| } |
| |
| boolean isConfigEligibleForLockdown = false; |
| if (dpm != null) { |
| final ComponentName deviceOwner = dpm.getDeviceOwnerComponentOnAnyUser(); |
| if (deviceOwner != null) { |
| final int deviceOwnerUserId = dpm.getDeviceOwnerUserId(); |
| try { |
| final int deviceOwnerUid = pm.getPackageUidAsUser(deviceOwner.getPackageName(), |
| deviceOwnerUserId); |
| isConfigEligibleForLockdown = deviceOwnerUid == config.creatorUid; |
| } catch (PackageManager.NameNotFoundException e) { |
| // don't care |
| } |
| } |
| } |
| if (!isConfigEligibleForLockdown) { |
| return false; |
| } |
| |
| final ContentResolver resolver = context.getContentResolver(); |
| final boolean isLockdownFeatureEnabled = Settings.Global.getInt(resolver, |
| Settings.Global.WIFI_DEVICE_OWNER_CONFIGS_LOCKDOWN, 0) != 0; |
| return isLockdownFeatureEnabled; |
| } |
| |
| /** Returns true if the provided NetworkCapabilities indicate a captive portal network. */ |
| public static boolean canSignIntoNetwork(NetworkCapabilities capabilities) { |
| return (capabilities != null |
| && capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_CAPTIVE_PORTAL)); |
| } |
| } |