/*
* Copyright (C) 2007 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.internal.widget;
import com.android.internal.R;
import com.android.internal.telephony.ITelephony;
import com.google.android.collect.Lists;
import android.app.admin.DevicePolicyManager;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.FileObserver;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.storage.IMountService;
import android.provider.Settings;
import android.security.KeyStore;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Utilities for the lock pattern and its settings.
*/
public class LockPatternUtils {
private static final String OPTION_ENABLE_FACELOCK = "enable_facelock";
private static final String TAG = "LockPatternUtils";
private static final String SYSTEM_DIRECTORY = "/system/";
private static final String LOCK_PATTERN_FILE = "gesture.key";
private static final String LOCK_PASSWORD_FILE = "password.key";
/**
* The maximum number of incorrect attempts before the user is prevented
* from trying again for {@link #FAILED_ATTEMPT_TIMEOUT_MS}.
*/
public static final int FAILED_ATTEMPTS_BEFORE_TIMEOUT = 5;
/**
* The number of incorrect attempts before which we fall back on an alternative
* method of verifying the user, and resetting their lock pattern.
*/
public static final int FAILED_ATTEMPTS_BEFORE_RESET = 20;
/**
* How long the user is prevented from trying again after entering the
* wrong pattern too many times.
*/
public static final long FAILED_ATTEMPT_TIMEOUT_MS = 30000L;
/**
* The interval of the countdown for showing progress of the lockout.
*/
public static final long FAILED_ATTEMPT_COUNTDOWN_INTERVAL_MS = 1000L;
/**
* This dictates when we start telling the user that continued failed attempts will wipe
* their device.
*/
public static final int FAILED_ATTEMPTS_BEFORE_WIPE_GRACE = 5;
/**
* The minimum number of dots in a valid pattern.
*/
public static final int MIN_LOCK_PATTERN_SIZE = 4;
/**
* The minimum number of dots the user must include in a wrong pattern
* attempt for it to be counted against the counts that affect
* {@link #FAILED_ATTEMPTS_BEFORE_TIMEOUT} and {@link #FAILED_ATTEMPTS_BEFORE_RESET}
*/
public static final int MIN_PATTERN_REGISTER_FAIL = MIN_LOCK_PATTERN_SIZE;
private final static String LOCKOUT_PERMANENT_KEY = "lockscreen.lockedoutpermanently";
private final static String LOCKOUT_ATTEMPT_DEADLINE = "lockscreen.lockoutattemptdeadline";
private final static String PATTERN_EVER_CHOSEN_KEY = "lockscreen.patterneverchosen";
public final static String PASSWORD_TYPE_KEY = "lockscreen.password_type";
public static final String PASSWORD_TYPE_ALTERNATE_KEY = "lockscreen.password_type_alternate";
private final static String LOCK_PASSWORD_SALT_KEY = "lockscreen.password_salt";
private final static String DISABLE_LOCKSCREEN_KEY = "lockscreen.disabled";
private final static String LOCKSCREEN_OPTIONS = "lockscreen.options";
public final static String LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK
= "lockscreen.biometric_weak_fallback";
public final static String BIOMETRIC_WEAK_EVER_CHOSEN_KEY
= "lockscreen.biometricweakeverchosen";
public final static String LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS
= "lockscreen.power_button_instantly_locks";
private final static String PASSWORD_HISTORY_KEY = "lockscreen.passwordhistory";
private final Context mContext;
private final ContentResolver mContentResolver;
private DevicePolicyManager mDevicePolicyManager;
private static String sLockPatternFilename;
private static String sLockPasswordFilename;
private static final AtomicBoolean sHaveNonZeroPatternFile = new AtomicBoolean(false);
private static final AtomicBoolean sHaveNonZeroPasswordFile = new AtomicBoolean(false);
private static FileObserver sPasswordObserver;
private static class PasswordFileObserver extends FileObserver {
public PasswordFileObserver(String path, int mask) {
super(path, mask);
}
@Override
public void onEvent(int event, String path) {
if (LOCK_PATTERN_FILE.equals(path)) {
Log.d(TAG, "lock pattern file changed");
sHaveNonZeroPatternFile.set(new File(sLockPatternFilename).length() > 0);
} else if (LOCK_PASSWORD_FILE.equals(path)) {
Log.d(TAG, "lock password file changed");
sHaveNonZeroPasswordFile.set(new File(sLockPasswordFilename).length() > 0);
}
}
}
public DevicePolicyManager getDevicePolicyManager() {
if (mDevicePolicyManager == null) {
mDevicePolicyManager =
(DevicePolicyManager)mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
if (mDevicePolicyManager == null) {
Log.e(TAG, "Can't get DevicePolicyManagerService: is it running?",
new IllegalStateException("Stack trace:"));
}
}
return mDevicePolicyManager;
}
/**
* @param contentResolver Used to look up and save settings.
*/
public LockPatternUtils(Context context) {
mContext = context;
mContentResolver = context.getContentResolver();
// Initialize the location of gesture & PIN lock files
if (sLockPatternFilename == null) {
String dataSystemDirectory =
android.os.Environment.getDataDirectory().getAbsolutePath() +
SYSTEM_DIRECTORY;
sLockPatternFilename = dataSystemDirectory + LOCK_PATTERN_FILE;
sLockPasswordFilename = dataSystemDirectory + LOCK_PASSWORD_FILE;
sHaveNonZeroPatternFile.set(new File(sLockPatternFilename).length() > 0);
sHaveNonZeroPasswordFile.set(new File(sLockPasswordFilename).length() > 0);
int fileObserverMask = FileObserver.CLOSE_WRITE | FileObserver.DELETE |
FileObserver.MOVED_TO | FileObserver.CREATE;
sPasswordObserver = new PasswordFileObserver(dataSystemDirectory, fileObserverMask);
sPasswordObserver.startWatching();
}
}
public int getRequestedMinimumPasswordLength() {
return getDevicePolicyManager().getPasswordMinimumLength(null);
}
/**
* Gets the device policy password mode. If the mode is non-specific, returns
* MODE_PATTERN which allows the user to choose anything.
*/
public int getRequestedPasswordQuality() {
return getDevicePolicyManager().getPasswordQuality(null);
}
public int getRequestedPasswordHistoryLength() {
return getDevicePolicyManager().getPasswordHistoryLength(null);
}
public int getRequestedPasswordMinimumLetters() {
return getDevicePolicyManager().getPasswordMinimumLetters(null);
}
public int getRequestedPasswordMinimumUpperCase() {
return getDevicePolicyManager().getPasswordMinimumUpperCase(null);
}
public int getRequestedPasswordMinimumLowerCase() {
return getDevicePolicyManager().getPasswordMinimumLowerCase(null);
}
public int getRequestedPasswordMinimumNumeric() {
return getDevicePolicyManager().getPasswordMinimumNumeric(null);
}
public int getRequestedPasswordMinimumSymbols() {
return getDevicePolicyManager().getPasswordMinimumSymbols(null);
}
public int getRequestedPasswordMinimumNonLetter() {
return getDevicePolicyManager().getPasswordMinimumNonLetter(null);
}
/**
* Returns the actual password mode, as set by keyguard after updating the password.
*
* @return
*/
public void reportFailedPasswordAttempt() {
getDevicePolicyManager().reportFailedPasswordAttempt();
}
public void reportSuccessfulPasswordAttempt() {
getDevicePolicyManager().reportSuccessfulPasswordAttempt();
}
/**
* Check to see if a pattern matches the saved pattern. If no pattern exists,
* always returns true.
* @param pattern The pattern to check.
* @return Whether the pattern matches the stored one.
*/
public boolean checkPattern(List<LockPatternView.Cell> pattern) {
try {
// Read all the bytes from the file
RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "r");
final byte[] stored = new byte[(int) raf.length()];
int got = raf.read(stored, 0, stored.length);
raf.close();
if (got <= 0) {
return true;
}
// Compare the hash from the file with the entered pattern's hash
return Arrays.equals(stored, LockPatternUtils.patternToHash(pattern));
} catch (FileNotFoundException fnfe) {
return true;
} catch (IOException ioe) {
return true;
}
}
/**
* Check to see if a password matches the saved password. If no password exists,
* always returns true.
* @param password The password to check.
* @return Whether the password matches the stored one.
*/
public boolean checkPassword(String password) {
try {
// Read all the bytes from the file
RandomAccessFile raf = new RandomAccessFile(sLockPasswordFilename, "r");
final byte[] stored = new byte[(int) raf.length()];
int got = raf.read(stored, 0, stored.length);
raf.close();
if (got <= 0) {
return true;
}
// Compare the hash from the file with the entered password's hash
return Arrays.equals(stored, passwordToHash(password));
} catch (FileNotFoundException fnfe) {
return true;
} catch (IOException ioe) {
return true;
}
}
/**
* Check to see if a password matches any of the passwords stored in the
* password history.
*
* @param password The password to check.
* @return Whether the password matches any in the history.
*/
public boolean checkPasswordHistory(String password) {
String passwordHashString = new String(passwordToHash(password));
String passwordHistory = getString(PASSWORD_HISTORY_KEY);
if (passwordHistory == null) {
return false;
}
// Password History may be too long...
int passwordHashLength = passwordHashString.length();
int passwordHistoryLength = getRequestedPasswordHistoryLength();
if(passwordHistoryLength == 0) {
return false;
}
int neededPasswordHistoryLength = passwordHashLength * passwordHistoryLength
+ passwordHistoryLength - 1;
if (passwordHistory.length() > neededPasswordHistoryLength) {
passwordHistory = passwordHistory.substring(0, neededPasswordHistoryLength);
}
return passwordHistory.contains(passwordHashString);
}
/**
* Check to see if the user has stored a lock pattern.
* @return Whether a saved pattern exists.
*/
public boolean savedPatternExists() {
return sHaveNonZeroPatternFile.get();
}
/**
* Check to see if the user has stored a lock pattern.
* @return Whether a saved pattern exists.
*/
public boolean savedPasswordExists() {
return sHaveNonZeroPasswordFile.get();
}
/**
* Return true if the user has ever chosen a pattern. This is true even if the pattern is
* currently cleared.
*
* @return True if the user has ever chosen a pattern.
*/
public boolean isPatternEverChosen() {
return getBoolean(PATTERN_EVER_CHOSEN_KEY, false);
}
/**
* Return true if the user has ever chosen biometric weak. This is true even if biometric
* weak is not current set.
*
* @return True if the user has ever chosen biometric weak.
*/
public boolean isBiometricWeakEverChosen() {
return getBoolean(BIOMETRIC_WEAK_EVER_CHOSEN_KEY, false);
}
/**
* Used by device policy manager to validate the current password
* information it has.
*/
public int getActivePasswordQuality() {
int activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
// Note we don't want to use getKeyguardStoredPasswordQuality() because we want this to
// return biometric_weak if that is being used instead of the backup
int quality =
(int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
switch (quality) {
case DevicePolicyManager.PASSWORD_QUALITY_SOMETHING:
if (isLockPatternEnabled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
}
break;
case DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK:
if (isBiometricWeakInstalled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK;
}
break;
case DevicePolicyManager.PASSWORD_QUALITY_NUMERIC:
if (isLockPasswordEnabled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
}
break;
case DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC:
if (isLockPasswordEnabled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC;
}
break;
case DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC:
if (isLockPasswordEnabled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC;
}
break;
case DevicePolicyManager.PASSWORD_QUALITY_COMPLEX:
if (isLockPasswordEnabled()) {
activePasswordQuality = DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
}
break;
}
return activePasswordQuality;
}
/**
* Clear any lock pattern or password.
*/
public void clearLock(boolean isFallback) {
if(!isFallback) deleteGallery();
saveLockPassword(null, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
setLockPatternEnabled(false);
saveLockPattern(null);
setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
setLong(PASSWORD_TYPE_ALTERNATE_KEY, DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED);
}
/**
* Disable showing lock screen at all when the DevicePolicyManager allows it.
* This is only meaningful if pattern, pin or password are not set.
*
* @param disable Disables lock screen when true
*/
public void setLockScreenDisabled(boolean disable) {
setLong(DISABLE_LOCKSCREEN_KEY, disable ? 1 : 0);
}
/**
* Determine if LockScreen can be disabled. This is used, for example, to tell if we should
* show LockScreen or go straight to the home screen.
*
* @return true if lock screen is can be disabled
*/
public boolean isLockScreenDisabled() {
return !isSecure() && getLong(DISABLE_LOCKSCREEN_KEY, 0) != 0;
}
/**
* Calls back SetupFaceLock to delete the temporary gallery file
*/
public void deleteTempGallery() {
Intent intent = new Intent().setClassName("com.android.facelock",
"com.android.facelock.SetupFaceLock");
intent.putExtra("deleteTempGallery", true);
mContext.startActivity(intent);
}
/**
* Calls back SetupFaceLock to delete the gallery file when the lock type is changed
*/
void deleteGallery() {
if(usingBiometricWeak()) {
Intent intent = new Intent().setClassName("com.android.facelock",
"com.android.facelock.SetupFaceLock");
intent.putExtra("deleteGallery", true);
mContext.startActivity(intent);
}
}
/**
* Save a lock pattern.
* @param pattern The new pattern to save.
*/
public void saveLockPattern(List<LockPatternView.Cell> pattern) {
this.saveLockPattern(pattern, false);
}
/**
* Save a lock pattern.
* @param pattern The new pattern to save.
* @param isFallback Specifies if this is a fallback to biometric weak
*/
public void saveLockPattern(List<LockPatternView.Cell> pattern, boolean isFallback) {
// Compute the hash
final byte[] hash = LockPatternUtils.patternToHash(pattern);
try {
// Write the hash to file
RandomAccessFile raf = new RandomAccessFile(sLockPatternFilename, "rw");
// Truncate the file if pattern is null, to clear the lock
if (pattern == null) {
raf.setLength(0);
} else {
raf.write(hash, 0, hash.length);
}
raf.close();
DevicePolicyManager dpm = getDevicePolicyManager();
KeyStore keyStore = KeyStore.getInstance();
if (pattern != null) {
keyStore.password(patternToString(pattern));
setBoolean(PATTERN_EVER_CHOSEN_KEY, true);
if (!isFallback) {
deleteGallery();
setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_SOMETHING,
pattern.size(), 0, 0, 0, 0, 0, 0);
} else {
setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK);
setLong(PASSWORD_TYPE_ALTERNATE_KEY,
DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
finishBiometricWeak();
dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK,
0, 0, 0, 0, 0, 0, 0);
}
} else {
if (keyStore.isEmpty()) {
keyStore.reset();
}
dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 0, 0,
0, 0, 0, 0, 0);
}
} catch (FileNotFoundException fnfe) {
// Cant do much, unless we want to fail over to using the settings
// provider
Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
} catch (IOException ioe) {
// Cant do much
Log.e(TAG, "Unable to save lock pattern to " + sLockPatternFilename);
}
}
/**
* Compute the password quality from the given password string.
*/
static public int computePasswordQuality(String password) {
boolean hasDigit = false;
boolean hasNonDigit = false;
final int len = password.length();
for (int i = 0; i < len; i++) {
if (Character.isDigit(password.charAt(i))) {
hasDigit = true;
} else {
hasNonDigit = true;
}
}
if (hasNonDigit && hasDigit) {
return DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC;
}
if (hasNonDigit) {
return DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC;
}
if (hasDigit) {
return DevicePolicyManager.PASSWORD_QUALITY_NUMERIC;
}
return DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED;
}
/** Update the encryption password if it is enabled **/
private void updateEncryptionPassword(String password) {
DevicePolicyManager dpm = getDevicePolicyManager();
if (dpm.getStorageEncryptionStatus() != DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE) {
return;
}
IBinder service = ServiceManager.getService("mount");
if (service == null) {
Log.e(TAG, "Could not find the mount service to update the encryption password");
return;
}
IMountService mountService = IMountService.Stub.asInterface(service);
try {
mountService.changeEncryptionPassword(password);
} catch (RemoteException e) {
Log.e(TAG, "Error changing encryption password", e);
}
}
/**
* Save a lock password. Does not ensure that the password is as good
* as the requested mode, but will adjust the mode to be as good as the
* pattern.
* @param password The password to save
* @param quality {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)}
*/
public void saveLockPassword(String password, int quality) {
this.saveLockPassword(password, quality, false);
}
/**
* Save a lock password. Does not ensure that the password is as good
* as the requested mode, but will adjust the mode to be as good as the
* pattern.
* @param password The password to save
* @param quality {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)}
* @param isFallback Specifies if this is a fallback to biometric weak
*/
public void saveLockPassword(String password, int quality, boolean isFallback) {
// Compute the hash
final byte[] hash = passwordToHash(password);
try {
// Write the hash to file
RandomAccessFile raf = new RandomAccessFile(sLockPasswordFilename, "rw");
// Truncate the file if pattern is null, to clear the lock
if (password == null) {
raf.setLength(0);
} else {
raf.write(hash, 0, hash.length);
}
raf.close();
DevicePolicyManager dpm = getDevicePolicyManager();
KeyStore keyStore = KeyStore.getInstance();
if (password != null) {
// Update the encryption password.
updateEncryptionPassword(password);
// Update the keystore password
keyStore.password(password);
int computedQuality = computePasswordQuality(password);
if (!isFallback) {
deleteGallery();
setLong(PASSWORD_TYPE_KEY, Math.max(quality, computedQuality));
if (computedQuality != DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED) {
int letters = 0;
int uppercase = 0;
int lowercase = 0;
int numbers = 0;
int symbols = 0;
int nonletter = 0;
for (int i = 0; i < password.length(); i++) {
char c = password.charAt(i);
if (c >= 'A' && c <= 'Z') {
letters++;
uppercase++;
} else if (c >= 'a' && c <= 'z') {
letters++;
lowercase++;
} else if (c >= '0' && c <= '9') {
numbers++;
nonletter++;
} else {
symbols++;
nonletter++;
}
}
dpm.setActivePasswordState(Math.max(quality, computedQuality),
password.length(), letters, uppercase, lowercase,
numbers, symbols, nonletter);
} else {
// The password is not anything.
dpm.setActivePasswordState(
DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED,
0, 0, 0, 0, 0, 0, 0);
}
} else {
// Case where it's a fallback for biometric weak
setLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK);
setLong(PASSWORD_TYPE_ALTERNATE_KEY, Math.max(quality, computedQuality));
finishBiometricWeak();
dpm.setActivePasswordState(DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK,
0, 0, 0, 0, 0, 0, 0);
}
// Add the password to the password history. We assume all
// password
// hashes have the same length for simplicity of implementation.
String passwordHistory = getString(PASSWORD_HISTORY_KEY);
if (passwordHistory == null) {
passwordHistory = new String();
}
int passwordHistoryLength = getRequestedPasswordHistoryLength();
if (passwordHistoryLength == 0) {
passwordHistory = "";
} else {
passwordHistory = new String(hash) + "," + passwordHistory;
// Cut it to contain passwordHistoryLength hashes
// and passwordHistoryLength -1 commas.
passwordHistory = passwordHistory.substring(0, Math.min(hash.length
* passwordHistoryLength + passwordHistoryLength - 1, passwordHistory
.length()));
}
setString(PASSWORD_HISTORY_KEY, passwordHistory);
} else {
// Conditionally reset the keystore if empty. If
// non-empty, we are just switching key guard type
if (keyStore.isEmpty()) {
keyStore.reset();
}
dpm.setActivePasswordState(
DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED, 0, 0, 0, 0, 0, 0, 0);
}
} catch (FileNotFoundException fnfe) {
// Cant do much, unless we want to fail over to using the settings provider
Log.e(TAG, "Unable to save lock pattern to " + sLockPasswordFilename);
} catch (IOException ioe) {
// Cant do much
Log.e(TAG, "Unable to save lock pattern to " + sLockPasswordFilename);
}
}
/**
* Retrieves the quality mode we're in.
* {@see DevicePolicyManager#getPasswordQuality(android.content.ComponentName)}
*
* @return stored password quality
*/
public int getKeyguardStoredPasswordQuality() {
int quality =
(int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
// If the user has chosen to use weak biometric sensor, then return the backup locking
// method and treat biometric as a special case.
if (quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK) {
quality =
(int) getLong(PASSWORD_TYPE_ALTERNATE_KEY,
DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
}
return quality;
}
/**
* @return true if the lockscreen method is set to biometric weak
*/
public boolean usingBiometricWeak() {
int quality =
(int) getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING);
return quality == DevicePolicyManager.PASSWORD_QUALITY_BIOMETRIC_WEAK;
}
/**
* Deserialize a pattern.
* @param string The pattern serialized with {@link #patternToString}
* @return The pattern.
*/
public static List<LockPatternView.Cell> stringToPattern(String string) {
List<LockPatternView.Cell> result = Lists.newArrayList();
final byte[] bytes = string.getBytes();
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
result.add(LockPatternView.Cell.of(b / 3, b % 3));
}
return result;
}
/**
* Serialize a pattern.
* @param pattern The pattern.
* @return The pattern in string form.
*/
public static String patternToString(List<LockPatternView.Cell> pattern) {
if (pattern == null) {
return "";
}
final int patternSize = pattern.size();
byte[] res = new byte[patternSize];
for (int i = 0; i < patternSize; i++) {
LockPatternView.Cell cell = pattern.get(i);
res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
}
return new String(res);
}
/*
* Generate an SHA-1 hash for the pattern. Not the most secure, but it is
* at least a second level of protection. First level is that the file
* is in a location only readable by the system process.
* @param pattern the gesture pattern.
* @return the hash of the pattern in a byte array.
*/
private static byte[] patternToHash(List<LockPatternView.Cell> pattern) {
if (pattern == null) {
return null;
}
final int patternSize = pattern.size();
byte[] res = new byte[patternSize];
for (int i = 0; i < patternSize; i++) {
LockPatternView.Cell cell = pattern.get(i);
res[i] = (byte) (cell.getRow() * 3 + cell.getColumn());
}
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
byte[] hash = md.digest(res);
return hash;
} catch (NoSuchAlgorithmException nsa) {
return res;
}
}
private String getSalt() {
long salt = getLong(LOCK_PASSWORD_SALT_KEY, 0);
if (salt == 0) {
try {
salt = SecureRandom.getInstance("SHA1PRNG").nextLong();
setLong(LOCK_PASSWORD_SALT_KEY, salt);
Log.v(TAG, "Initialized lock password salt");
} catch (NoSuchAlgorithmException e) {
// Throw an exception rather than storing a password we'll never be able to recover
throw new IllegalStateException("Couldn't get SecureRandom number", e);
}
}
return Long.toHexString(salt);
}
/*
* Generate a hash for the given password. To avoid brute force attacks, we use a salted hash.
* Not the most secure, but it is at least a second level of protection. First level is that
* the file is in a location only readable by the system process.
* @param password the gesture pattern.
* @return the hash of the pattern in a byte array.
*/
public byte[] passwordToHash(String password) {
if (password == null) {
return null;
}
String algo = null;
byte[] hashed = null;
try {
byte[] saltedPassword = (password + getSalt()).getBytes();
byte[] sha1 = MessageDigest.getInstance(algo = "SHA-1").digest(saltedPassword);
byte[] md5 = MessageDigest.getInstance(algo = "MD5").digest(saltedPassword);
hashed = (toHex(sha1) + toHex(md5)).getBytes();
} catch (NoSuchAlgorithmException e) {
Log.w(TAG, "Failed to encode string because of missing algorithm: " + algo);
}
return hashed;
}
private static String toHex(byte[] ary) {
final String hex = "0123456789ABCDEF";
String ret = "";
for (int i = 0; i < ary.length; i++) {
ret += hex.charAt((ary[i] >> 4) & 0xf);
ret += hex.charAt(ary[i] & 0xf);
}
return ret;
}
/**
* @return Whether the lock password is enabled, or if it is set as a backup for biometric weak
*/
public boolean isLockPasswordEnabled() {
long mode = getLong(PASSWORD_TYPE_KEY, 0);
long backupMode = getLong(PASSWORD_TYPE_ALTERNATE_KEY, 0);
final boolean passwordEnabled = mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
final boolean backupEnabled = backupMode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC
|| backupMode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC
|| backupMode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC
|| backupMode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
return savedPasswordExists() && (passwordEnabled ||
(usingBiometricWeak() && backupEnabled));
}
/**
* @return Whether the lock pattern is enabled, or if it is set as a backup for biometric weak
*/
public boolean isLockPatternEnabled() {
final boolean backupEnabled =
getLong(PASSWORD_TYPE_ALTERNATE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING)
== DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
return getBoolean(Settings.Secure.LOCK_PATTERN_ENABLED, false)
&& (getLong(PASSWORD_TYPE_KEY, DevicePolicyManager.PASSWORD_QUALITY_SOMETHING)
== DevicePolicyManager.PASSWORD_QUALITY_SOMETHING ||
(usingBiometricWeak() && backupEnabled));
}
/**
* @return Whether biometric weak lock is installed and that the front facing camera exists
*/
public boolean isBiometricWeakInstalled() {
// Check that the system flag was set
if (!OPTION_ENABLE_FACELOCK.equals(getString(LOCKSCREEN_OPTIONS))) {
return false;
}
// Check that it's installed
PackageManager pm = mContext.getPackageManager();
try {
pm.getPackageInfo("com.android.facelock", PackageManager.GET_ACTIVITIES);
} catch (PackageManager.NameNotFoundException e) {
return false;
}
// Check that the camera is enabled
if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {
return false;
}
if (getDevicePolicyManager().getCameraDisabled(null)) {
return false;
}
return true;
}
/**
* Set whether the lock pattern is enabled.
*/
public void setLockPatternEnabled(boolean enabled) {
setBoolean(Settings.Secure.LOCK_PATTERN_ENABLED, enabled);
}
/**
* @return Whether the visible pattern is enabled.
*/
public boolean isVisiblePatternEnabled() {
return getBoolean(Settings.Secure.LOCK_PATTERN_VISIBLE, false);
}
/**
* Set whether the visible pattern is enabled.
*/
public void setVisiblePatternEnabled(boolean enabled) {
setBoolean(Settings.Secure.LOCK_PATTERN_VISIBLE, enabled);
}
/**
* @return Whether tactile feedback for the pattern is enabled.
*/
public boolean isTactileFeedbackEnabled() {
return getBoolean(Settings.Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED, false);
}
/**
* Set whether tactile feedback for the pattern is enabled.
*/
public void setTactileFeedbackEnabled(boolean enabled) {
setBoolean(Settings.Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED, enabled);
}
/**
* Set and store the lockout deadline, meaning the user can't attempt his/her unlock
* pattern until the deadline has passed.
* @return the chosen deadline.
*/
public long setLockoutAttemptDeadline() {
final long deadline = SystemClock.elapsedRealtime() + FAILED_ATTEMPT_TIMEOUT_MS;
setLong(LOCKOUT_ATTEMPT_DEADLINE, deadline);
return deadline;
}
/**
* @return The elapsed time in millis in the future when the user is allowed to
* attempt to enter his/her lock pattern, or 0 if the user is welcome to
* enter a pattern.
*/
public long getLockoutAttemptDeadline() {
final long deadline = getLong(LOCKOUT_ATTEMPT_DEADLINE, 0L);
final long now = SystemClock.elapsedRealtime();
if (deadline < now || deadline > (now + FAILED_ATTEMPT_TIMEOUT_MS)) {
return 0L;
}
return deadline;
}
/**
* @return Whether the user is permanently locked out until they verify their
* credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed
* attempts.
*/
public boolean isPermanentlyLocked() {
return getBoolean(LOCKOUT_PERMANENT_KEY, false);
}
/**
* Set the state of whether the device is permanently locked, meaning the user
* must authenticate via other means.
*
* @param locked Whether the user is permanently locked out until they verify their
* credentials. Occurs after {@link #FAILED_ATTEMPTS_BEFORE_RESET} failed
* attempts.
*/
public void setPermanentlyLocked(boolean locked) {
setBoolean(LOCKOUT_PERMANENT_KEY, locked);
}
public boolean isEmergencyCallCapable() {
return mContext.getResources().getBoolean(
com.android.internal.R.bool.config_voice_capable);
}
public boolean isPukUnlockScreenEnable() {
return mContext.getResources().getBoolean(
com.android.internal.R.bool.config_enable_puk_unlock_screen);
}
public boolean isEmergencyCallEnabledWhileSimLocked() {
return mContext.getResources().getBoolean(
com.android.internal.R.bool.config_enable_emergency_call_while_sim_locked);
}
/**
* @return A formatted string of the next alarm (for showing on the lock screen),
* or null if there is no next alarm.
*/
public String getNextAlarm() {
String nextAlarm = Settings.System.getString(mContentResolver,
Settings.System.NEXT_ALARM_FORMATTED);
if (nextAlarm == null || TextUtils.isEmpty(nextAlarm)) {
return null;
}
return nextAlarm;
}
private boolean getBoolean(String secureSettingKey, boolean defaultValue) {
return 1 ==
android.provider.Settings.Secure.getInt(mContentResolver, secureSettingKey,
defaultValue ? 1 : 0);
}
private void setBoolean(String secureSettingKey, boolean enabled) {
android.provider.Settings.Secure.putInt(mContentResolver, secureSettingKey,
enabled ? 1 : 0);
}
private long getLong(String secureSettingKey, long def) {
return android.provider.Settings.Secure.getLong(mContentResolver, secureSettingKey, def);
}
private void setLong(String secureSettingKey, long value) {
android.provider.Settings.Secure.putLong(mContentResolver, secureSettingKey, value);
}
private String getString(String secureSettingKey) {
return android.provider.Settings.Secure.getString(mContentResolver, secureSettingKey);
}
private void setString(String secureSettingKey, String value) {
android.provider.Settings.Secure.putString(mContentResolver, secureSettingKey, value);
}
public boolean isSecure() {
long mode = getKeyguardStoredPasswordQuality();
final boolean isPattern = mode == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
final boolean isPassword = mode == DevicePolicyManager.PASSWORD_QUALITY_NUMERIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHABETIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_ALPHANUMERIC
|| mode == DevicePolicyManager.PASSWORD_QUALITY_COMPLEX;
final boolean secure = isPattern && isLockPatternEnabled() && savedPatternExists()
|| isPassword && savedPasswordExists();
return secure;
}
/**
* Sets the emergency button visibility based on isEmergencyCallCapable().
*
* If the emergency button is visible, sets the text on the emergency button
* to indicate what action will be taken.
*
* If there's currently a call in progress, the button will take them to the call
* @param button the button to update
* @param the phone state:
* {@link TelephonyManager#CALL_STATE_IDLE}
* {@link TelephonyManager#CALL_STATE_RINGING}
* {@link TelephonyManager#CALL_STATE_OFFHOOK}
* @param shown indicates whether the given screen wants the emergency button to show at all
*/
public void updateEmergencyCallButtonState(Button button, int phoneState, boolean shown) {
if (isEmergencyCallCapable() && shown) {
button.setVisibility(View.VISIBLE);
} else {
button.setVisibility(View.GONE);
return;
}
int textId;
if (phoneState == TelephonyManager.CALL_STATE_OFFHOOK) {
// show "return to call" text and show phone icon
textId = R.string.lockscreen_return_to_call;
int phoneCallIcon = R.drawable.stat_sys_phone_call;
button.setCompoundDrawablesWithIntrinsicBounds(phoneCallIcon, 0, 0, 0);
} else {
textId = R.string.lockscreen_emergency_call;
int emergencyIcon = R.drawable.ic_emergency;
button.setCompoundDrawablesWithIntrinsicBounds(emergencyIcon, 0, 0, 0);
}
button.setText(textId);
}
/**
* Resumes a call in progress. Typically launched from the EmergencyCall button
* on various lockscreens.
*
* @return true if we were able to tell InCallScreen to show.
*/
public boolean resumeCall() {
ITelephony phone = ITelephony.Stub.asInterface(ServiceManager.checkService("phone"));
try {
if (phone != null && phone.showCallScreen()) {
return true;
}
} catch (RemoteException e) {
// What can we do?
}
return false;
}
private void finishBiometricWeak() {
setBoolean(BIOMETRIC_WEAK_EVER_CHOSEN_KEY, true);
// Launch intent to show final screen, this also
// moves the temporary gallery to the actual gallery
Intent intent = new Intent();
intent.setClassName("com.android.facelock",
"com.android.facelock.SetupEndScreen");
mContext.startActivity(intent);
}
public void setPowerButtonInstantlyLocks(boolean enabled) {
setBoolean(LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS, enabled);
}
public boolean getPowerButtonInstantlyLocks() {
return getBoolean(LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS, true);
}
}