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      1 /*
      2  * Copyright (C) 2012 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 package com.android.keyguard;
     17 
     18 import android.app.admin.DevicePolicyManager;
     19 import android.content.Context;
     20 import android.telephony.SubscriptionManager;
     21 
     22 import com.android.internal.telephony.IccCardConstants;
     23 import com.android.internal.widget.LockPatternUtils;
     24 
     25 public class KeyguardSecurityModel {
     26 
     27     /**
     28      * The different types of security available.
     29      * @see KeyguardSecurityContainer#showSecurityScreen
     30      */
     31     public enum SecurityMode {
     32         Invalid, // NULL state
     33         None, // No security enabled
     34         Pattern, // Unlock by drawing a pattern.
     35         Password, // Unlock by entering an alphanumeric password
     36         PIN, // Strictly numeric password
     37         SimPin, // Unlock by entering a sim pin.
     38         SimPuk // Unlock by entering a sim puk
     39     }
     40 
     41     private final Context mContext;
     42     private final boolean mIsPukScreenAvailable;
     43 
     44     private LockPatternUtils mLockPatternUtils;
     45 
     46     KeyguardSecurityModel(Context context) {
     47         mContext = context;
     48         mLockPatternUtils = new LockPatternUtils(context);
     49         mIsPukScreenAvailable = mContext.getResources().getBoolean(
     50                 com.android.internal.R.bool.config_enable_puk_unlock_screen);
     51     }
     52 
     53     void setLockPatternUtils(LockPatternUtils utils) {
     54         mLockPatternUtils = utils;
     55     }
     56 
     57     SecurityMode getSecurityMode(int userId) {
     58         KeyguardUpdateMonitor monitor = KeyguardUpdateMonitor.getInstance(mContext);
     59 
     60         if (mIsPukScreenAvailable && SubscriptionManager.isValidSubscriptionId(
     61                 monitor.getNextSubIdForState(IccCardConstants.State.PUK_REQUIRED))) {
     62             return SecurityMode.SimPuk;
     63         }
     64 
     65         if (SubscriptionManager.isValidSubscriptionId(
     66                 monitor.getNextSubIdForState(IccCardConstants.State.PIN_REQUIRED))) {
     67             return SecurityMode.SimPin;
     68         }
     69 
     70         final int security = mLockPatternUtils.getActivePasswordQuality(userId);
     71         switch (security) {
     72             case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
     73             case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC_COMPLEX:
     74                 return SecurityMode.PIN;
     75 
     76             case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
     77             case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
     78             case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
     79             case DevicePolicyManager.PASSWORD_QUALITY_MANAGED:
     80                 return SecurityMode.Password;
     81 
     82             case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
     83                 return SecurityMode.Pattern;
     84             case DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED:
     85                 return SecurityMode.None;
     86 
     87             default:
     88                 throw new IllegalStateException("Unknown security quality:" + security);
     89         }
     90     }
     91 }
     92