a3b5bae9cf
This fixes a bad merge in LockSettingsService. Change-Id: I941bae77446dd0e94f409f0d64330ca5391f8efa
463 lines
17 KiB
Java
463 lines
17 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.content.ContentResolver;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.pm.PackageManager;
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import android.content.pm.UserInfo;
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import static android.content.Context.USER_SERVICE;
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import static android.Manifest.permission.READ_PROFILE;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.os.Binder;
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import android.os.Environment;
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import android.os.RemoteException;
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import android.os.SystemProperties;
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import android.os.UserHandle;
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import android.os.UserManager;
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import android.provider.Settings;
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import android.provider.Settings.Secure;
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import android.provider.Settings.SettingNotFoundException;
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import android.text.TextUtils;
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import android.util.Slog;
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import com.android.internal.widget.ILockSettings;
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import com.android.internal.widget.LockPatternUtils;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.util.Arrays;
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import java.util.List;
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/**
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* Keeps the lock pattern/password data and related settings for each user.
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* Used by LockPatternUtils. Needs to be a service because Settings app also needs
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* to be able to save lockscreen information for secondary users.
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* @hide
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*/
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public class LockSettingsService extends ILockSettings.Stub {
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private final DatabaseHelper mOpenHelper;
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private static final String TAG = "LockSettingsService";
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private static final String TABLE = "locksettings";
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private static final String COLUMN_KEY = "name";
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private static final String COLUMN_USERID = "user";
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private static final String COLUMN_VALUE = "value";
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private static final String[] COLUMNS_FOR_QUERY = {
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COLUMN_VALUE
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};
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private static final String SYSTEM_DIRECTORY = "/system/";
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private static final String LOCK_PATTERN_FILE = "gesture.key";
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private static final String LOCK_PASSWORD_FILE = "password.key";
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private final Context mContext;
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public LockSettingsService(Context context) {
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mContext = context;
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// Open the database
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mOpenHelper = new DatabaseHelper(mContext);
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}
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public void systemReady() {
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migrateOldData();
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}
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private void migrateOldData() {
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try {
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// These Settings moved before multi-user was enabled, so we only have to do it for the
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// root user.
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if (getString("migrated", null, 0) == null) {
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final ContentResolver cr = mContext.getContentResolver();
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for (String validSetting : VALID_SETTINGS) {
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String value = Settings.Secure.getString(cr, validSetting);
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if (value != null) {
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setString(validSetting, value, 0);
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}
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}
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// No need to move the password / pattern files. They're already in the right place.
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setString("migrated", "true", 0);
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Slog.i(TAG, "Migrated lock settings to new location");
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}
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// These Settings changed after multi-user was enabled, hence need to be moved per user.
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if (getString("migrated_user_specific", null, 0) == null) {
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final UserManager um = (UserManager) mContext.getSystemService(USER_SERVICE);
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final ContentResolver cr = mContext.getContentResolver();
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List<UserInfo> users = um.getUsers();
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for (int user = 0; user < users.size(); user++) {
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// Migrate owner info
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final int userId = users.get(user).id;
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final String OWNER_INFO = Secure.LOCK_SCREEN_OWNER_INFO;
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String ownerInfo = Settings.Secure.getStringForUser(cr, OWNER_INFO, userId);
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if (ownerInfo != null) {
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setString(OWNER_INFO, ownerInfo, userId);
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Settings.Secure.putStringForUser(cr, ownerInfo, "", userId);
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}
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// Migrate owner info enabled. Note there was a bug where older platforms only
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// stored this value if the checkbox was toggled at least once. The code detects
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// this case by handling the exception.
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final String OWNER_INFO_ENABLED = Secure.LOCK_SCREEN_OWNER_INFO_ENABLED;
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boolean enabled;
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try {
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int ivalue = Settings.Secure.getIntForUser(cr, OWNER_INFO_ENABLED, userId);
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enabled = ivalue != 0;
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setLong(OWNER_INFO_ENABLED, enabled ? 1 : 0, userId);
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} catch (SettingNotFoundException e) {
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// Setting was never stored. Store it if the string is not empty.
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if (!TextUtils.isEmpty(ownerInfo)) {
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setLong(OWNER_INFO_ENABLED, 1, userId);
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}
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}
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Settings.Secure.putIntForUser(cr, OWNER_INFO_ENABLED, 0, userId);
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}
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// No need to move the password / pattern files. They're already in the right place.
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setString("migrated_user_specific", "true", 0);
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Slog.i(TAG, "Migrated per-user lock settings to new location");
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}
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} catch (RemoteException re) {
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Slog.e(TAG, "Unable to migrate old data", re);
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}
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}
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private static final void checkWritePermission(int userId) {
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final int callingUid = Binder.getCallingUid();
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if (UserHandle.getAppId(callingUid) != android.os.Process.SYSTEM_UID) {
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throw new SecurityException("uid=" + callingUid
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+ " not authorized to write lock settings");
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}
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}
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private static final void checkPasswordReadPermission(int userId) {
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final int callingUid = Binder.getCallingUid();
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if (UserHandle.getAppId(callingUid) != android.os.Process.SYSTEM_UID) {
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throw new SecurityException("uid=" + callingUid
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+ " not authorized to read lock password");
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}
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}
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private final void checkReadPermission(String requestedKey, int userId) {
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final int callingUid = Binder.getCallingUid();
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for (int i = 0; i < READ_PROFILE_PROTECTED_SETTINGS.length; i++) {
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String key = READ_PROFILE_PROTECTED_SETTINGS[i];
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if (key.equals(requestedKey) && mContext.checkCallingOrSelfPermission(READ_PROFILE)
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!= PackageManager.PERMISSION_GRANTED) {
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throw new SecurityException("uid=" + callingUid
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+ " needs permission " + READ_PROFILE + " to read "
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+ requestedKey + " for user " + userId);
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}
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}
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}
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@Override
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public void setBoolean(String key, boolean value, int userId) throws RemoteException {
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checkWritePermission(userId);
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writeToDb(key, value ? "1" : "0", userId);
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}
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@Override
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public void setLong(String key, long value, int userId) throws RemoteException {
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checkWritePermission(userId);
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writeToDb(key, Long.toString(value), userId);
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}
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@Override
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public void setString(String key, String value, int userId) throws RemoteException {
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checkWritePermission(userId);
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writeToDb(key, value, userId);
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}
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@Override
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public boolean getBoolean(String key, boolean defaultValue, int userId) throws RemoteException {
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checkReadPermission(key, userId);
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String value = readFromDb(key, null, userId);
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return TextUtils.isEmpty(value) ?
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defaultValue : (value.equals("1") || value.equals("true"));
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}
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@Override
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public long getLong(String key, long defaultValue, int userId) throws RemoteException {
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checkReadPermission(key, userId);
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String value = readFromDb(key, null, userId);
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return TextUtils.isEmpty(value) ? defaultValue : Long.parseLong(value);
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}
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@Override
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public String getString(String key, String defaultValue, int userId) throws RemoteException {
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checkReadPermission(key, userId);
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return readFromDb(key, defaultValue, userId);
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}
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private String getLockPatternFilename(int userId) {
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String dataSystemDirectory =
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android.os.Environment.getDataDirectory().getAbsolutePath() +
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SYSTEM_DIRECTORY;
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if (userId == 0) {
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// Leave it in the same place for user 0
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return dataSystemDirectory + LOCK_PATTERN_FILE;
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} else {
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return new File(Environment.getUserSystemDirectory(userId), LOCK_PATTERN_FILE)
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.getAbsolutePath();
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}
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}
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private String getLockPasswordFilename(int userId) {
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String dataSystemDirectory =
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android.os.Environment.getDataDirectory().getAbsolutePath() +
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SYSTEM_DIRECTORY;
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if (userId == 0) {
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// Leave it in the same place for user 0
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return dataSystemDirectory + LOCK_PASSWORD_FILE;
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} else {
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return new File(Environment.getUserSystemDirectory(userId), LOCK_PASSWORD_FILE)
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.getAbsolutePath();
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}
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}
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@Override
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public boolean havePassword(int userId) throws RemoteException {
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// Do we need a permissions check here?
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return new File(getLockPasswordFilename(userId)).length() > 0;
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}
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@Override
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public boolean havePattern(int userId) throws RemoteException {
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// Do we need a permissions check here?
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return new File(getLockPatternFilename(userId)).length() > 0;
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}
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@Override
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public void setLockPattern(byte[] hash, int userId) throws RemoteException {
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checkWritePermission(userId);
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writeFile(getLockPatternFilename(userId), hash);
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}
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@Override
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public boolean checkPattern(byte[] hash, int userId) throws RemoteException {
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checkPasswordReadPermission(userId);
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try {
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// Read all the bytes from the file
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RandomAccessFile raf = new RandomAccessFile(getLockPatternFilename(userId), "r");
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final byte[] stored = new byte[(int) raf.length()];
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int got = raf.read(stored, 0, stored.length);
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raf.close();
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if (got <= 0) {
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return true;
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}
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// Compare the hash from the file with the entered pattern's hash
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return Arrays.equals(stored, hash);
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} catch (FileNotFoundException fnfe) {
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Slog.e(TAG, "Cannot read file " + fnfe);
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return true;
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} catch (IOException ioe) {
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Slog.e(TAG, "Cannot read file " + ioe);
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return true;
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}
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}
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@Override
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public void setLockPassword(byte[] hash, int userId) throws RemoteException {
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checkWritePermission(userId);
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writeFile(getLockPasswordFilename(userId), hash);
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}
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@Override
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public boolean checkPassword(byte[] hash, int userId) throws RemoteException {
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checkPasswordReadPermission(userId);
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try {
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// Read all the bytes from the file
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RandomAccessFile raf = new RandomAccessFile(getLockPasswordFilename(userId), "r");
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final byte[] stored = new byte[(int) raf.length()];
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int got = raf.read(stored, 0, stored.length);
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raf.close();
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if (got <= 0) {
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return true;
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}
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// Compare the hash from the file with the entered password's hash
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return Arrays.equals(stored, hash);
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} catch (FileNotFoundException fnfe) {
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Slog.e(TAG, "Cannot read file " + fnfe);
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return true;
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} catch (IOException ioe) {
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Slog.e(TAG, "Cannot read file " + ioe);
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return true;
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}
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}
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@Override
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public void removeUser(int userId) {
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checkWritePermission(userId);
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SQLiteDatabase db = mOpenHelper.getWritableDatabase();
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try {
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File file = new File(getLockPasswordFilename(userId));
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if (file.exists()) {
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file.delete();
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}
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file = new File(getLockPatternFilename(userId));
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if (file.exists()) {
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file.delete();
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}
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db.beginTransaction();
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db.delete(TABLE, COLUMN_USERID + "='" + userId + "'", null);
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db.setTransactionSuccessful();
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} finally {
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db.endTransaction();
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}
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}
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private void writeFile(String name, byte[] hash) {
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try {
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// Write the hash to file
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RandomAccessFile raf = new RandomAccessFile(name, "rw");
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// Truncate the file if pattern is null, to clear the lock
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if (hash == null || hash.length == 0) {
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raf.setLength(0);
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} else {
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raf.write(hash, 0, hash.length);
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}
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raf.close();
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} catch (IOException ioe) {
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Slog.e(TAG, "Error writing to file " + ioe);
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}
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}
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private void writeToDb(String key, String value, int userId) {
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writeToDb(mOpenHelper.getWritableDatabase(), key, value, userId);
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}
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private void writeToDb(SQLiteDatabase db, String key, String value, int userId) {
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ContentValues cv = new ContentValues();
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cv.put(COLUMN_KEY, key);
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cv.put(COLUMN_USERID, userId);
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cv.put(COLUMN_VALUE, value);
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db.beginTransaction();
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try {
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db.delete(TABLE, COLUMN_KEY + "=? AND " + COLUMN_USERID + "=?",
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new String[] {key, Integer.toString(userId)});
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db.insert(TABLE, null, cv);
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db.setTransactionSuccessful();
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} finally {
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db.endTransaction();
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}
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}
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private String readFromDb(String key, String defaultValue, int userId) {
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Cursor cursor;
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String result = defaultValue;
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SQLiteDatabase db = mOpenHelper.getReadableDatabase();
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if ((cursor = db.query(TABLE, COLUMNS_FOR_QUERY,
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COLUMN_USERID + "=? AND " + COLUMN_KEY + "=?",
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new String[] { Integer.toString(userId), key },
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null, null, null)) != null) {
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if (cursor.moveToFirst()) {
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result = cursor.getString(0);
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}
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cursor.close();
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}
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return result;
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}
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class DatabaseHelper extends SQLiteOpenHelper {
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private static final String TAG = "LockSettingsDB";
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private static final String DATABASE_NAME = "locksettings.db";
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private static final int DATABASE_VERSION = 1;
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public DatabaseHelper(Context context) {
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super(context, DATABASE_NAME, null, DATABASE_VERSION);
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setWriteAheadLoggingEnabled(true);
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}
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private void createTable(SQLiteDatabase db) {
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db.execSQL("CREATE TABLE " + TABLE + " (" +
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"_id INTEGER PRIMARY KEY AUTOINCREMENT," +
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COLUMN_KEY + " TEXT," +
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COLUMN_USERID + " INTEGER," +
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COLUMN_VALUE + " TEXT" +
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");");
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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createTable(db);
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initializeDefaults(db);
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}
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private void initializeDefaults(SQLiteDatabase db) {
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// Get the lockscreen default from a system property, if available
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boolean lockScreenDisable = SystemProperties.getBoolean("ro.lockscreen.disable.default",
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false);
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if (lockScreenDisable) {
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writeToDb(db, LockPatternUtils.DISABLE_LOCKSCREEN_KEY, "1", 0);
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}
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int currentVersion) {
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// Nothing yet
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}
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}
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private static final String[] VALID_SETTINGS = new String[] {
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LockPatternUtils.LOCKOUT_PERMANENT_KEY,
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LockPatternUtils.LOCKOUT_ATTEMPT_DEADLINE,
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LockPatternUtils.PATTERN_EVER_CHOSEN_KEY,
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LockPatternUtils.PASSWORD_TYPE_KEY,
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LockPatternUtils.PASSWORD_TYPE_ALTERNATE_KEY,
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LockPatternUtils.LOCK_PASSWORD_SALT_KEY,
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LockPatternUtils.DISABLE_LOCKSCREEN_KEY,
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LockPatternUtils.LOCKSCREEN_OPTIONS,
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LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK,
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LockPatternUtils.BIOMETRIC_WEAK_EVER_CHOSEN_KEY,
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LockPatternUtils.LOCKSCREEN_POWER_BUTTON_INSTANTLY_LOCKS,
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LockPatternUtils.PASSWORD_HISTORY_KEY,
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Secure.LOCK_PATTERN_ENABLED,
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Secure.LOCK_BIOMETRIC_WEAK_FLAGS,
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Secure.LOCK_PATTERN_VISIBLE,
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Secure.LOCK_PATTERN_TACTILE_FEEDBACK_ENABLED
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};
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// These are protected with a read permission
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private static final String[] READ_PROFILE_PROTECTED_SETTINGS = new String[] {
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Secure.LOCK_SCREEN_OWNER_INFO_ENABLED,
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Secure.LOCK_SCREEN_OWNER_INFO
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};
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}
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