/* * 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.security; import android.content.Context; import android.os.UserManager; import android.security.keystore.KeyProperties; import android.security.keystore2.AndroidKeyStoreLoadStoreParameter; import androidx.preference.PreferenceScreen; import com.android.settingslib.RestrictedPreference; import com.android.settingslib.core.lifecycle.Lifecycle; import com.android.settingslib.core.lifecycle.LifecycleObserver; import com.android.settingslib.core.lifecycle.events.OnResume; import java.security.KeyStore; import java.security.KeyStoreException; public class ResetCredentialsPreferenceController extends RestrictedEncryptionPreferenceController implements LifecycleObserver, OnResume { private static final String KEY_RESET_CREDENTIALS = "credentials_reset"; private final KeyStore mKeyStore; private final KeyStore mWifiKeyStore; private RestrictedPreference mPreference; public ResetCredentialsPreferenceController(Context context, Lifecycle lifecycle) { super(context, UserManager.DISALLOW_CONFIG_CREDENTIALS); KeyStore keyStore = null; try { keyStore = KeyStore.getInstance("AndroidKeyStore"); keyStore.load(null); } catch (Exception e) { keyStore = null; } mKeyStore = keyStore; keyStore = null; if (context.getUser().isSystem()) { try { keyStore = KeyStore.getInstance("AndroidKeyStore"); keyStore.load(new AndroidKeyStoreLoadStoreParameter(KeyProperties.NAMESPACE_WIFI)); } catch (Exception e) { keyStore = null; } } mWifiKeyStore = keyStore; if (lifecycle != null) { lifecycle.addObserver(this); } } @Override public String getPreferenceKey() { return KEY_RESET_CREDENTIALS; } @Override public void displayPreference(PreferenceScreen screen) { super.displayPreference(screen); mPreference = screen.findPreference(getPreferenceKey()); } @Override public void onResume() { if (mPreference != null && !mPreference.isDisabledByAdmin()) { boolean isEnabled = false; try { isEnabled = (mKeyStore != null && mKeyStore.aliases().hasMoreElements()) || (mWifiKeyStore != null && mWifiKeyStore.aliases().hasMoreElements()); } catch (KeyStoreException e) { // If access to keystore fails, treat as disabled. } mPreference.setEnabled(isEnabled); } } }