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      1 /*
      2  * Copyright (C) 2007 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 
     20 import static android.provider.Settings.System.SCREEN_OFF_TIMEOUT;
     21 
     22 import android.app.Activity;
     23 import android.app.AlertDialog;
     24 import android.app.admin.DevicePolicyManager;
     25 import android.content.Context;
     26 import android.content.DialogInterface;
     27 import android.content.Intent;
     28 import android.os.Bundle;
     29 import android.os.Vibrator;
     30 import android.preference.CheckBoxPreference;
     31 import android.preference.ListPreference;
     32 import android.preference.Preference;
     33 import android.preference.Preference.OnPreferenceChangeListener;
     34 import android.preference.PreferenceGroup;
     35 import android.preference.PreferenceScreen;
     36 import android.provider.Settings;
     37 import android.security.KeyStore;
     38 import android.telephony.TelephonyManager;
     39 import android.util.Log;
     40 
     41 import com.android.internal.telephony.Phone;
     42 import com.android.internal.widget.LockPatternUtils;
     43 
     44 import java.util.ArrayList;
     45 
     46 /**
     47  * Gesture lock pattern settings.
     48  */
     49 public class SecuritySettings extends SettingsPreferenceFragment
     50         implements OnPreferenceChangeListener, DialogInterface.OnClickListener {
     51 
     52     // Lock Settings
     53     private static final String KEY_UNLOCK_SET_OR_CHANGE = "unlock_set_or_change";
     54     private static final String KEY_BIOMETRIC_WEAK_IMPROVE_MATCHING =
     55             "biometric_weak_improve_matching";
     56     private static final String KEY_LOCK_ENABLED = "lockenabled";
     57     private static final String KEY_VISIBLE_PATTERN = "visiblepattern";
     58     private static final String KEY_TACTILE_FEEDBACK_ENABLED = "unlock_tactile_feedback";
     59     private static final String KEY_SECURITY_CATEGORY = "security_category";
     60     private static final String KEY_LOCK_AFTER_TIMEOUT = "lock_after_timeout";
     61     private static final int SET_OR_CHANGE_LOCK_METHOD_REQUEST = 123;
     62     private static final int CONFIRM_EXISTING_FOR_BIOMETRIC_IMPROVE_REQUEST = 124;
     63 
     64     // Misc Settings
     65     private static final String KEY_SIM_LOCK = "sim_lock";
     66     private static final String KEY_SHOW_PASSWORD = "show_password";
     67     private static final String KEY_RESET_CREDENTIALS = "reset_credentials";
     68     private static final String KEY_TOGGLE_INSTALL_APPLICATIONS = "toggle_install_applications";
     69     private static final String KEY_POWER_INSTANTLY_LOCKS = "power_button_instantly_locks";
     70 
     71     DevicePolicyManager mDPM;
     72 
     73     private ChooseLockSettingsHelper mChooseLockSettingsHelper;
     74     private LockPatternUtils mLockPatternUtils;
     75     private ListPreference mLockAfter;
     76 
     77     private CheckBoxPreference mVisiblePattern;
     78     private CheckBoxPreference mTactileFeedback;
     79 
     80     private CheckBoxPreference mShowPassword;
     81 
     82     private Preference mResetCredentials;
     83 
     84     private CheckBoxPreference mToggleAppInstallation;
     85     private DialogInterface mWarnInstallApps;
     86     private CheckBoxPreference mPowerButtonInstantlyLocks;
     87 
     88     @Override
     89     public void onCreate(Bundle savedInstanceState) {
     90         super.onCreate(savedInstanceState);
     91 
     92         mLockPatternUtils = new LockPatternUtils(getActivity());
     93 
     94         mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);
     95 
     96         mChooseLockSettingsHelper = new ChooseLockSettingsHelper(getActivity());
     97     }
     98 
     99     private PreferenceScreen createPreferenceHierarchy() {
    100         PreferenceScreen root = getPreferenceScreen();
    101         if (root != null) {
    102             root.removeAll();
    103         }
    104         addPreferencesFromResource(R.xml.security_settings);
    105         root = getPreferenceScreen();
    106 
    107         // Add options for lock/unlock screen
    108         int resid = 0;
    109         if (!mLockPatternUtils.isSecure()) {
    110             if (mLockPatternUtils.isLockScreenDisabled()) {
    111                 resid = R.xml.security_settings_lockscreen;
    112             } else {
    113                 resid = R.xml.security_settings_chooser;
    114             }
    115         } else if (mLockPatternUtils.usingBiometricWeak() &&
    116                 mLockPatternUtils.isBiometricWeakInstalled()) {
    117             resid = R.xml.security_settings_biometric_weak;
    118         } else {
    119             switch (mLockPatternUtils.getKeyguardStoredPasswordQuality()) {
    120                 case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
    121                     resid = R.xml.security_settings_pattern;
    122                     break;
    123                 case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
    124                     resid = R.xml.security_settings_pin;
    125                     break;
    126                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
    127                 case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
    128                 case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
    129                     resid = R.xml.security_settings_password;
    130                     break;
    131             }
    132         }
    133         addPreferencesFromResource(resid);
    134 
    135 
    136         // Add options for device encryption
    137         DevicePolicyManager dpm =
    138                 (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
    139 
    140         switch (dpm.getStorageEncryptionStatus()) {
    141         case DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE:
    142             // The device is currently encrypted.
    143             addPreferencesFromResource(R.xml.security_settings_encrypted);
    144             break;
    145         case DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE:
    146             // This device supports encryption but isn't encrypted.
    147             addPreferencesFromResource(R.xml.security_settings_unencrypted);
    148             break;
    149         }
    150 
    151         // lock after preference
    152         mLockAfter = (ListPreference) root.findPreference(KEY_LOCK_AFTER_TIMEOUT);
    153         if (mLockAfter != null) {
    154             setupLockAfterPreference();
    155             updateLockAfterPreferenceSummary();
    156         }
    157 
    158         // visible pattern
    159         mVisiblePattern = (CheckBoxPreference) root.findPreference(KEY_VISIBLE_PATTERN);
    160 
    161         // lock instantly on power key press
    162         mPowerButtonInstantlyLocks = (CheckBoxPreference) root.findPreference(
    163                 KEY_POWER_INSTANTLY_LOCKS);
    164 
    165         // don't display visible pattern if biometric and backup is not pattern
    166         if (resid == R.xml.security_settings_biometric_weak &&
    167                 mLockPatternUtils.getKeyguardStoredPasswordQuality() !=
    168                 DevicePolicyManager.PASSWORD_QUALITY_SOMETHING) {
    169             PreferenceGroup securityCategory = (PreferenceGroup)
    170                     root.findPreference(KEY_SECURITY_CATEGORY);
    171             if (securityCategory != null && mVisiblePattern != null) {
    172                 securityCategory.removePreference(root.findPreference(KEY_VISIBLE_PATTERN));
    173             }
    174         }
    175 
    176         // tactile feedback. Should be common to all unlock preference screens.
    177         mTactileFeedback = (CheckBoxPreference) root.findPreference(KEY_TACTILE_FEEDBACK_ENABLED);
    178         if (!((Vibrator) getSystemService(Context.VIBRATOR_SERVICE)).hasVibrator()) {
    179             PreferenceGroup securityCategory = (PreferenceGroup)
    180                     root.findPreference(KEY_SECURITY_CATEGORY);
    181             if (securityCategory != null && mTactileFeedback != null) {
    182                 securityCategory.removePreference(mTactileFeedback);
    183             }
    184         }
    185 
    186         // Append the rest of the settings
    187         addPreferencesFromResource(R.xml.security_settings_misc);
    188 
    189         // Do not display SIM lock for CDMA phone
    190         TelephonyManager tm = TelephonyManager.getDefault();
    191         if ((TelephonyManager.PHONE_TYPE_CDMA == tm.getCurrentPhoneType()) &&
    192                 (tm.getLteOnCdmaMode() != Phone.LTE_ON_CDMA_TRUE)) {
    193             root.removePreference(root.findPreference(KEY_SIM_LOCK));
    194         } else {
    195             // Disable SIM lock if sim card is missing or unknown
    196             if ((TelephonyManager.getDefault().getSimState() ==
    197                                  TelephonyManager.SIM_STATE_ABSENT) ||
    198                 (TelephonyManager.getDefault().getSimState() ==
    199                                  TelephonyManager.SIM_STATE_UNKNOWN)) {
    200                 root.findPreference(KEY_SIM_LOCK).setEnabled(false);
    201             }
    202         }
    203 
    204         // Show password
    205         mShowPassword = (CheckBoxPreference) root.findPreference(KEY_SHOW_PASSWORD);
    206 
    207         // Credential storage
    208         mResetCredentials = root.findPreference(KEY_RESET_CREDENTIALS);
    209 
    210         mToggleAppInstallation = (CheckBoxPreference) findPreference(
    211                 KEY_TOGGLE_INSTALL_APPLICATIONS);
    212         mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());
    213 
    214         return root;
    215     }
    216 
    217     private boolean isNonMarketAppsAllowed() {
    218         return Settings.Secure.getInt(getContentResolver(),
    219                                       Settings.Secure.INSTALL_NON_MARKET_APPS, 0) > 0;
    220     }
    221 
    222     private void setNonMarketAppsAllowed(boolean enabled) {
    223         // Change the system setting
    224         Settings.Secure.putInt(getContentResolver(), Settings.Secure.INSTALL_NON_MARKET_APPS,
    225                                 enabled ? 1 : 0);
    226     }
    227 
    228     private void warnAppInstallation() {
    229         // TODO: DialogFragment?
    230         mWarnInstallApps = new AlertDialog.Builder(getActivity()).setTitle(
    231                 getResources().getString(R.string.error_title))
    232                 .setIcon(com.android.internal.R.drawable.ic_dialog_alert)
    233                 .setMessage(getResources().getString(R.string.install_all_warning))
    234                 .setPositiveButton(android.R.string.yes, this)
    235                 .setNegativeButton(android.R.string.no, null)
    236                 .show();
    237     }
    238 
    239     public void onClick(DialogInterface dialog, int which) {
    240         if (dialog == mWarnInstallApps && which == DialogInterface.BUTTON_POSITIVE) {
    241             setNonMarketAppsAllowed(true);
    242             mToggleAppInstallation.setChecked(true);
    243         }
    244     }
    245 
    246     @Override
    247     public void onDestroy() {
    248         super.onDestroy();
    249         if (mWarnInstallApps != null) {
    250             mWarnInstallApps.dismiss();
    251         }
    252     }
    253 
    254     private void setupLockAfterPreference() {
    255         // Compatible with pre-Froyo
    256         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
    257                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
    258         mLockAfter.setValue(String.valueOf(currentTimeout));
    259         mLockAfter.setOnPreferenceChangeListener(this);
    260         final long adminTimeout = (mDPM != null ? mDPM.getMaximumTimeToLock(null) : 0);
    261         final long displayTimeout = Math.max(0,
    262                 Settings.System.getInt(getContentResolver(), SCREEN_OFF_TIMEOUT, 0));
    263         if (adminTimeout > 0) {
    264             // This setting is a slave to display timeout when a device policy is enforced.
    265             // As such, maxLockTimeout = adminTimeout - displayTimeout.
    266             // If there isn't enough time, shows "immediately" setting.
    267             disableUnusableTimeouts(Math.max(0, adminTimeout - displayTimeout));
    268         }
    269     }
    270 
    271     private void updateLockAfterPreferenceSummary() {
    272         // Update summary message with current value
    273         long currentTimeout = Settings.Secure.getLong(getContentResolver(),
    274                 Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, 5000);
    275         final CharSequence[] entries = mLockAfter.getEntries();
    276         final CharSequence[] values = mLockAfter.getEntryValues();
    277         int best = 0;
    278         for (int i = 0; i < values.length; i++) {
    279             long timeout = Long.valueOf(values[i].toString());
    280             if (currentTimeout >= timeout) {
    281                 best = i;
    282             }
    283         }
    284         mLockAfter.setSummary(getString(R.string.lock_after_timeout_summary, entries[best]));
    285     }
    286 
    287     private void disableUnusableTimeouts(long maxTimeout) {
    288         final CharSequence[] entries = mLockAfter.getEntries();
    289         final CharSequence[] values = mLockAfter.getEntryValues();
    290         ArrayList<CharSequence> revisedEntries = new ArrayList<CharSequence>();
    291         ArrayList<CharSequence> revisedValues = new ArrayList<CharSequence>();
    292         for (int i = 0; i < values.length; i++) {
    293             long timeout = Long.valueOf(values[i].toString());
    294             if (timeout <= maxTimeout) {
    295                 revisedEntries.add(entries[i]);
    296                 revisedValues.add(values[i]);
    297             }
    298         }
    299         if (revisedEntries.size() != entries.length || revisedValues.size() != values.length) {
    300             mLockAfter.setEntries(
    301                     revisedEntries.toArray(new CharSequence[revisedEntries.size()]));
    302             mLockAfter.setEntryValues(
    303                     revisedValues.toArray(new CharSequence[revisedValues.size()]));
    304             final int userPreference = Integer.valueOf(mLockAfter.getValue());
    305             if (userPreference <= maxTimeout) {
    306                 mLockAfter.setValue(String.valueOf(userPreference));
    307             } else {
    308                 // There will be no highlighted selection since nothing in the list matches
    309                 // maxTimeout. The user can still select anything less than maxTimeout.
    310                 // TODO: maybe append maxTimeout to the list and mark selected.
    311             }
    312         }
    313         mLockAfter.setEnabled(revisedEntries.size() > 0);
    314     }
    315 
    316     @Override
    317     public void onResume() {
    318         super.onResume();
    319 
    320         // Make sure we reload the preference hierarchy since some of these settings
    321         // depend on others...
    322         createPreferenceHierarchy();
    323 
    324         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
    325         if (mVisiblePattern != null) {
    326             mVisiblePattern.setChecked(lockPatternUtils.isVisiblePatternEnabled());
    327         }
    328         if (mTactileFeedback != null) {
    329             mTactileFeedback.setChecked(lockPatternUtils.isTactileFeedbackEnabled());
    330         }
    331         if (mPowerButtonInstantlyLocks != null) {
    332             mPowerButtonInstantlyLocks.setChecked(lockPatternUtils.getPowerButtonInstantlyLocks());
    333         }
    334 
    335         mShowPassword.setChecked(Settings.System.getInt(getContentResolver(),
    336                 Settings.System.TEXT_SHOW_PASSWORD, 1) != 0);
    337 
    338         KeyStore.State state = KeyStore.getInstance().state();
    339         mResetCredentials.setEnabled(state != KeyStore.State.UNINITIALIZED);
    340     }
    341 
    342     @Override
    343     public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
    344         final String key = preference.getKey();
    345 
    346         final LockPatternUtils lockPatternUtils = mChooseLockSettingsHelper.utils();
    347         if (KEY_UNLOCK_SET_OR_CHANGE.equals(key)) {
    348             startFragment(this, "com.android.settings.ChooseLockGeneric$ChooseLockGenericFragment",
    349                     SET_OR_CHANGE_LOCK_METHOD_REQUEST, null);
    350         } else if (KEY_BIOMETRIC_WEAK_IMPROVE_MATCHING.equals(key)) {
    351             ChooseLockSettingsHelper helper =
    352                     new ChooseLockSettingsHelper(this.getActivity(), this);
    353             if (!helper.launchConfirmationActivity(
    354                     CONFIRM_EXISTING_FOR_BIOMETRIC_IMPROVE_REQUEST, null, null)) {
    355                 startBiometricWeakImprove(); // no password set, so no need to confirm
    356             }
    357         } else if (KEY_LOCK_ENABLED.equals(key)) {
    358             lockPatternUtils.setLockPatternEnabled(isToggled(preference));
    359         } else if (KEY_VISIBLE_PATTERN.equals(key)) {
    360             lockPatternUtils.setVisiblePatternEnabled(isToggled(preference));
    361         } else if (KEY_TACTILE_FEEDBACK_ENABLED.equals(key)) {
    362             lockPatternUtils.setTactileFeedbackEnabled(isToggled(preference));
    363         } else if (KEY_POWER_INSTANTLY_LOCKS.equals(key)) {
    364             lockPatternUtils.setPowerButtonInstantlyLocks(isToggled(preference));
    365         } else if (preference == mShowPassword) {
    366             Settings.System.putInt(getContentResolver(), Settings.System.TEXT_SHOW_PASSWORD,
    367                     mShowPassword.isChecked() ? 1 : 0);
    368         } else if (preference == mToggleAppInstallation) {
    369             if (mToggleAppInstallation.isChecked()) {
    370                 mToggleAppInstallation.setChecked(false);
    371                 warnAppInstallation();
    372             } else {
    373                 setNonMarketAppsAllowed(false);
    374             }
    375         } else {
    376             // If we didn't handle it, let preferences handle it.
    377             return super.onPreferenceTreeClick(preferenceScreen, preference);
    378         }
    379 
    380         return true;
    381     }
    382 
    383     private boolean isToggled(Preference pref) {
    384         return ((CheckBoxPreference) pref).isChecked();
    385     }
    386 
    387     /**
    388      * see confirmPatternThenDisableAndClear
    389      */
    390     @Override
    391     public void onActivityResult(int requestCode, int resultCode, Intent data) {
    392         super.onActivityResult(requestCode, resultCode, data);
    393         if (requestCode == CONFIRM_EXISTING_FOR_BIOMETRIC_IMPROVE_REQUEST &&
    394                 resultCode == Activity.RESULT_OK) {
    395             startBiometricWeakImprove();
    396             return;
    397         }
    398         createPreferenceHierarchy();
    399     }
    400 
    401     public boolean onPreferenceChange(Preference preference, Object value) {
    402         if (preference == mLockAfter) {
    403             int timeout = Integer.parseInt((String) value);
    404             try {
    405                 Settings.Secure.putInt(getContentResolver(),
    406                         Settings.Secure.LOCK_SCREEN_LOCK_AFTER_TIMEOUT, timeout);
    407             } catch (NumberFormatException e) {
    408                 Log.e("SecuritySettings", "could not persist lockAfter timeout setting", e);
    409             }
    410             updateLockAfterPreferenceSummary();
    411         }
    412         return true;
    413     }
    414 
    415     public void startBiometricWeakImprove(){
    416         Intent intent = new Intent();
    417         intent.setClassName("com.android.facelock", "com.android.facelock.AddToSetup");
    418         startActivity(intent);
    419     }
    420 }
    421