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      1 /*
      2  * Copyright (C) 2008 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 com.android.settings;
     18 
     19 import android.app.Activity;
     20 import android.app.AlertDialog;
     21 import android.app.admin.DevicePolicyManager;
     22 import android.content.BroadcastReceiver;
     23 import android.content.Context;
     24 import android.content.Intent;
     25 import android.content.IntentFilter;
     26 import android.content.res.Resources;
     27 import android.os.BatteryManager;
     28 import android.os.Bundle;
     29 import android.os.UserHandle;
     30 import android.os.storage.StorageManager;
     31 import android.support.v7.preference.Preference;
     32 import android.text.TextUtils;
     33 import android.view.LayoutInflater;
     34 import android.view.View;
     35 import android.view.ViewGroup;
     36 import android.widget.Button;
     37 
     38 import com.android.internal.logging.MetricsProto.MetricsEvent;
     39 
     40 public class CryptKeeperSettings extends InstrumentedFragment {
     41     private static final String TAG = "CryptKeeper";
     42     private static final String TYPE = "type";
     43     private static final String PASSWORD = "password";
     44 
     45     private static final int KEYGUARD_REQUEST = 55;
     46 
     47     // Minimum battery charge level (in percent) to launch encryption.  If the battery charge is
     48     // lower than this, encryption should not be activated.
     49     private static final int MIN_BATTERY_LEVEL = 80;
     50 
     51     private View mContentView;
     52     private Button mInitiateButton;
     53     private View mPowerWarning;
     54     private View mBatteryWarning;
     55     private IntentFilter mIntentFilter;
     56 
     57     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
     58         @Override
     59         public void onReceive(Context context, Intent intent) {
     60             String action = intent.getAction();
     61             if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
     62                 final int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
     63                 final int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
     64                 final int invalidCharger = intent.getIntExtra(
     65                     BatteryManager.EXTRA_INVALID_CHARGER, 0);
     66 
     67                 final boolean levelOk = level >= MIN_BATTERY_LEVEL;
     68                 final boolean pluggedOk =
     69                     ((plugged & BatteryManager.BATTERY_PLUGGED_ANY) != 0) &&
     70                      invalidCharger == 0;
     71 
     72                 // Update UI elements based on power/battery status
     73                 mInitiateButton.setEnabled(levelOk && pluggedOk);
     74                 mPowerWarning.setVisibility(pluggedOk ? View.GONE : View.VISIBLE );
     75                 mBatteryWarning.setVisibility(levelOk ? View.GONE : View.VISIBLE);
     76             }
     77         }
     78     };
     79 
     80     /**
     81      * If the user clicks to begin the reset sequence, we next require a
     82      * keyguard confirmation if the user has currently enabled one.  If there
     83      * is no keyguard available, we prompt the user to set a password.
     84      */
     85     private Button.OnClickListener mInitiateListener = new Button.OnClickListener() {
     86         @Override
     87         public void onClick(View v) {
     88             if (!runKeyguardConfirmation(KEYGUARD_REQUEST)) {
     89                 // TODO replace (or follow) this dialog with an explicit launch into password UI
     90                 new AlertDialog.Builder(getActivity())
     91                     .setTitle(R.string.crypt_keeper_dialog_need_password_title)
     92                     .setMessage(R.string.crypt_keeper_dialog_need_password_message)
     93                     .setPositiveButton(android.R.string.ok, null)
     94                     .create()
     95                     .show();
     96             }
     97         }
     98     };
     99 
    100     @Override
    101     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedState) {
    102         mContentView = inflater.inflate(R.layout.crypt_keeper_settings, null);
    103 
    104         mIntentFilter = new IntentFilter();
    105         mIntentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
    106 
    107         mInitiateButton = (Button) mContentView.findViewById(R.id.initiate_encrypt);
    108         mInitiateButton.setOnClickListener(mInitiateListener);
    109         mInitiateButton.setEnabled(false);
    110 
    111         mPowerWarning = mContentView.findViewById(R.id.warning_unplugged);
    112         mBatteryWarning = mContentView.findViewById(R.id.warning_low_charge);
    113 
    114         return mContentView;
    115     }
    116 
    117     @Override
    118     protected int getMetricsCategory() {
    119         return MetricsEvent.CRYPT_KEEPER;
    120     }
    121 
    122     @Override
    123     public void onResume() {
    124         super.onResume();
    125         getActivity().registerReceiver(mIntentReceiver, mIntentFilter);
    126     }
    127 
    128     @Override
    129     public void onPause() {
    130         super.onPause();
    131         getActivity().unregisterReceiver(mIntentReceiver);
    132     }
    133 
    134     /**
    135      * If encryption is already started, and this launched via a "start encryption" intent,
    136      * then exit immediately - it's already up and running, so there's no point in "starting" it.
    137      */
    138     @Override
    139     public void onActivityCreated(Bundle savedInstanceState) {
    140         super.onActivityCreated(savedInstanceState);
    141         Activity activity = getActivity();
    142         Intent intent = activity.getIntent();
    143         if (DevicePolicyManager.ACTION_START_ENCRYPTION.equals(intent.getAction())) {
    144             DevicePolicyManager dpm = (DevicePolicyManager)
    145                     activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
    146             if (dpm != null) {
    147                 int status = dpm.getStorageEncryptionStatus();
    148                 if (status != DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE) {
    149                     // There is nothing to do here, so simply finish() (which returns to caller)
    150                     activity.finish();
    151                 }
    152             }
    153         }
    154     }
    155 
    156     /**
    157      * Keyguard validation is run using the standard {@link ConfirmLockPattern}
    158      * component as a subactivity
    159      * @param request the request code to be returned once confirmation finishes
    160      * @return true if confirmation launched
    161      */
    162     private boolean runKeyguardConfirmation(int request) {
    163         Resources res = getActivity().getResources();
    164         ChooseLockSettingsHelper helper = new ChooseLockSettingsHelper(getActivity(), this);
    165 
    166         if (helper.utils().getKeyguardStoredPasswordQuality(UserHandle.myUserId())
    167                 == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
    168             showFinalConfirmation(StorageManager.CRYPT_TYPE_DEFAULT, "");
    169             return true;
    170         }
    171 
    172         return helper.launchConfirmationActivity(request,
    173                 res.getText(R.string.crypt_keeper_encrypt_title), true);
    174     }
    175 
    176     @Override
    177     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    178         super.onActivityResult(requestCode, resultCode, data);
    179 
    180         if (requestCode != KEYGUARD_REQUEST) {
    181             return;
    182         }
    183 
    184         // If the user entered a valid keyguard trace, present the final
    185         // confirmation prompt; otherwise, go back to the initial state.
    186         if (resultCode == Activity.RESULT_OK && data != null) {
    187             int type = data.getIntExtra(ChooseLockSettingsHelper.EXTRA_KEY_TYPE, -1);
    188             String password = data.getStringExtra(ChooseLockSettingsHelper.EXTRA_KEY_PASSWORD);
    189             if (!TextUtils.isEmpty(password)) {
    190                 showFinalConfirmation(type, password);
    191             }
    192         }
    193     }
    194 
    195     private void showFinalConfirmation(int type, String password) {
    196         Preference preference = new Preference(getPreferenceManager().getContext());
    197         preference.setFragment(CryptKeeperConfirm.class.getName());
    198         preference.setTitle(R.string.crypt_keeper_confirm_title);
    199         addEncryptionInfoToPreference(preference, type, password);
    200         ((SettingsActivity) getActivity()).onPreferenceStartFragment(null, preference);
    201     }
    202 
    203     private void addEncryptionInfoToPreference(Preference preference, int type, String password) {
    204         Activity activity = getActivity();
    205         DevicePolicyManager dpm = (DevicePolicyManager)
    206                 activity.getSystemService(Context.DEVICE_POLICY_SERVICE);
    207         if (dpm.getDoNotAskCredentialsOnBoot()) {
    208             preference.getExtras().putInt(TYPE, StorageManager.CRYPT_TYPE_DEFAULT);
    209             preference.getExtras().putString(PASSWORD, "");
    210         } else {
    211             preference.getExtras().putInt(TYPE, type);
    212             preference.getExtras().putString(PASSWORD, password);
    213         }
    214     }
    215 }
    216