1 /* 2 * Copyright (C) 2011 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.example.training.deviceadmin; 18 19 import android.app.Activity; 20 import android.app.admin.DeviceAdminReceiver; 21 import android.app.admin.DevicePolicyManager; 22 import android.content.ComponentName; 23 import android.content.Context; 24 import android.content.Intent; 25 import android.content.SharedPreferences; 26 import android.os.Build; 27 28 public class Policy { 29 public static final int REQUEST_ADD_DEVICE_ADMIN = 1; 30 31 private static final String APP_PREF = "APP_PREF"; 32 private static final String KEY_PASSWORD_LENGTH = "PW_LENGTH"; 33 private static final String KEY_PASSWORD_QUALITY = "PW_QUALITY"; 34 private static final String KEY_PASSWORD_MIN_UPPERCASE = "PW_MIN_UPPERCASE"; 35 36 // Password quality values. This list must match the list 37 // found in res/values/arrays.xml 38 final static int[] PASSWORD_QUALITY_VALUES = new int[] { 39 DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 40 DevicePolicyManager.PASSWORD_QUALITY_SOMETHING, 41 DevicePolicyManager.PASSWORD_QUALITY_NUMERIC, 42 DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC, 43 DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC, 44 DevicePolicyManager.PASSWORD_QUALITY_COMPLEX 45 }; 46 47 private int mPasswordQuality; 48 private int mPasswordLength; 49 private int mPasswordMinUpperCase; 50 private Context mContext; 51 private DevicePolicyManager mDPM; 52 private ComponentName mPolicyAdmin; 53 Policy(Context context)54 public Policy(Context context) { 55 mContext = context; 56 mPasswordQuality = -1; 57 mPasswordLength = 0; 58 mPasswordMinUpperCase = 0; 59 mDPM = (DevicePolicyManager) context.getSystemService(Context.DEVICE_POLICY_SERVICE); 60 mPolicyAdmin = new ComponentName(context, PolicyAdmin.class); 61 } 62 63 /** 64 * Saves the policy parameters. 65 * 66 * @param passwordQuality Password quality. 67 * @param passwordLength Password minimum length. 68 * @param passwordUppercase Password minimum number of upper case alphabets. 69 */ saveToLocal(int passwordQuality, int passwordLength, int passwordMinUppercase)70 public void saveToLocal(int passwordQuality, int passwordLength, int passwordMinUppercase) { 71 SharedPreferences.Editor editor = 72 mContext.getSharedPreferences(APP_PREF, Context.MODE_PRIVATE).edit(); 73 if (mPasswordQuality != passwordQuality) { 74 editor.putInt(KEY_PASSWORD_QUALITY, passwordQuality); 75 mPasswordQuality = passwordQuality; 76 } 77 if (mPasswordLength != passwordLength) { 78 editor.putInt(KEY_PASSWORD_LENGTH, passwordLength); 79 mPasswordLength = passwordLength; 80 } 81 if (mPasswordMinUpperCase != passwordMinUppercase) { 82 editor.putInt(KEY_PASSWORD_MIN_UPPERCASE, passwordMinUppercase); 83 mPasswordMinUpperCase = passwordMinUppercase; 84 } 85 editor.commit(); 86 } 87 readFromLocal()88 public void readFromLocal() { 89 SharedPreferences prefs = mContext.getSharedPreferences(APP_PREF, Context.MODE_PRIVATE); 90 mPasswordQuality = prefs.getInt(KEY_PASSWORD_QUALITY, -1); 91 mPasswordLength = prefs.getInt(KEY_PASSWORD_LENGTH, -1); 92 mPasswordMinUpperCase = prefs.getInt(KEY_PASSWORD_MIN_UPPERCASE, -1); 93 } 94 95 /** 96 * Getter for password quality. 97 * 98 * @return 99 */ getPasswordQuality()100 public int getPasswordQuality() { return mPasswordQuality; } 101 102 /** 103 * Getter for password length. 104 * 105 * @return 106 */ getPasswordLength()107 public int getPasswordLength() { return mPasswordLength; } 108 109 /** 110 * Getter for password minimum upper case alphabets. 111 * 112 * @return 113 */ getPasswordMinUpperCase()114 public int getPasswordMinUpperCase() { return mPasswordMinUpperCase; } 115 116 /** 117 * Getter for the policy administrator ComponentName object. 118 * 119 * @return 120 */ getPolicyAdmin()121 public ComponentName getPolicyAdmin() { return mPolicyAdmin; } 122 123 /** 124 * Indicates whether the device administrator is currently active. 125 * 126 * @return 127 */ isAdminActive()128 public boolean isAdminActive() { 129 return mDPM.isAdminActive(mPolicyAdmin); 130 } 131 isActivePasswordSufficient()132 public boolean isActivePasswordSufficient() { 133 return mDPM.isActivePasswordSufficient(); 134 } 135 isDeviceSecured()136 public boolean isDeviceSecured() { 137 return isAdminActive() && isActivePasswordSufficient(); 138 } 139 140 /** 141 * Configure policy defined in the object. 142 */ configurePolicy()143 public void configurePolicy() { 144 mDPM.setPasswordQuality(mPolicyAdmin, PASSWORD_QUALITY_VALUES[mPasswordQuality]); 145 mDPM.setPasswordMinimumLength(mPolicyAdmin, mPasswordLength); 146 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { 147 mDPM.setPasswordMinimumUpperCase(mPolicyAdmin, mPasswordMinUpperCase); 148 } 149 } 150 151 /** 152 * Through the PolicyAdmin receiver, the app can use this to trap various device 153 * administration events, such as password change, incorrect password entry, etc. 154 * 155 */ 156 public static class PolicyAdmin extends DeviceAdminReceiver { 157 158 @Override onDisabled(Context context, Intent intent)159 public void onDisabled(Context context, Intent intent) { 160 // Called when the app is about to be deactivated as a device administrator. 161 // Deletes previously stored password policy. 162 super.onDisabled(context, intent); 163 SharedPreferences prefs = context.getSharedPreferences(APP_PREF, Activity.MODE_PRIVATE); 164 prefs.edit().clear().commit(); 165 } 166 } 167 } 168 169