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/*
* Copyright (C) 2018 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.tv.settings.users;
import android.content.Context;
import android.content.pm.UserInfo;
import android.os.RemoteException;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.Log;
import androidx.annotation.NonNull;
import androidx.annotation.VisibleForTesting;
import com.android.internal.widget.LockPatternUtils;
import com.android.internal.widget.LockPatternUtils.RequestThrottledException;
import com.android.internal.widget.LockscreenCredential;
/**
* Utilities for saving restricted profile PINs. This class binds to a
* {@link RestrictedProfilePinService} to store and retrieve pins.
*/
public class RestrictedProfilePinStorage {
private static final String TAG = RestrictedProfilePinStorage.class.getSimpleName();
private final int mOwnerUserId;
private final LockPatternUtils mLockPatternUtils;
private final RestrictedProfilePinServiceConnection mConnection;
/**
* Return a new instance of RestrictedProfilePinStorage.
*/
public static RestrictedProfilePinStorage newInstance(Context context) {
LockPatternUtils lpu = new LockPatternUtils(context);
UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);
UserInfo currentUserInfo = um.getUserInfo(context.getUserId());
final int ownerUserId = findRestrictedProfileParent(currentUserInfo);
RestrictedProfilePinServiceConnection connection =
new RestrictedProfilePinServiceConnection(context);
return new RestrictedProfilePinStorage(lpu, ownerUserId, connection);
}
@VisibleForTesting
RestrictedProfilePinStorage(LockPatternUtils lpu, int ownerUserId,
RestrictedProfilePinServiceConnection connection) {
mLockPatternUtils = lpu;
mOwnerUserId = ownerUserId;
mConnection = connection;
}
/** Binds the pin service to be used later for all pin operations. To be called before any
* other use of this class. */
public void bind() {
mConnection.bindPinService();
}
/** Unbinds the pin service. */
public void unbind() {
mConnection.unbindPinService();
}
/**
* Set PIN password for the profile.
* @param pin New PIN password
* @param originalPin Original PIN password
*/
boolean setPin(@NonNull String pin, String originalPin) {
if (!isPinSet() || isPinCorrect(originalPin)) {
setPinInternal(pin);
clearLockPassword(LockscreenCredential.createPinOrNone(originalPin));
return true;
} else {
Log.w(TAG, "Unable to validate the original PIN");
return false;
}
}
/**
* Delete PIN password for the profile.
*/
boolean deletePin(@NonNull String oldPin) {
if (isPinCorrect(oldPin)) {
deletePinInternal();
clearLockPassword(LockscreenCredential.createPinOrNone(oldPin));
return true;
} else {
Log.w(TAG, "Unable to validate the original PIN");
return false;
}
}
/**
* Validate PIN password for the profile.
*/
boolean isPinCorrect(@NonNull String pin) {
return isPinSetInternal()
? isPinCorrectInternal(pin)
: !hasLockscreenSecurity() || checkPasswordLegacy(pin);
}
/**
* Check if there is a PIN password set on the profile.
*/
public boolean isPinSet() {
return isPinSetInternal() || hasLockscreenSecurity();
}
private boolean setPinInternal(String pin) {
if (pin == null) {
Log.e(TAG, "Attempt to set restricted profile pin to null. Aborting...");
return false;
}
try {
getPinService().setPin(pin);
return true;
} catch (RemoteException e) {
Log.w(TAG, "Could not set pin due to remote exception");
e.printStackTrace();
return false;
}
}
private boolean deletePinInternal() {
try {
getPinService().deletePin();
return true;
} catch (RemoteException e) {
Log.w(TAG, "Could not delete pin due to remote exception");
e.printStackTrace();
return false;
}
}
private boolean isPinCorrectInternal(String originalPin) {
try {
return getPinService().isPinCorrect(originalPin);
} catch (RemoteException e) {
Log.w(TAG, "Could not check pin due to remote exception");
e.printStackTrace();
}
return false;
}
private boolean isPinSetInternal() {
try {
return getPinService().isPinSet();
} catch (RemoteException e) {
e.printStackTrace();
}
return true;
}
private IRestrictedProfilePinService getPinService() throws RemoteException {
return mConnection.getPinService();
}
private void clearLockPassword(LockscreenCredential oldPin) {
mLockPatternUtils.setLockCredential(LockscreenCredential.createNone(), oldPin,
mOwnerUserId);
}
private boolean checkPasswordLegacy(String pin) {
try {
LockscreenCredential credential = LockscreenCredential.createPin(pin);
Log.i(TAG, "checkPasswordLegacy " + credential.getCredential());
boolean response = mLockPatternUtils.checkCredential(credential, mOwnerUserId, null);
Log.i(TAG, "response " + response);
if (response) {
// Copy PIN to internal storage.
setPinInternal(pin);
}
return response;
} catch (RequestThrottledException e) {
Log.e(TAG, "Unable to check password for unlocking the user", e);
}
return false; // Interpret this as an incorrect pin and ask for the pin again.
}
private boolean hasLockscreenSecurity() {
return mLockPatternUtils.isSecure(mOwnerUserId);
}
private static int findRestrictedProfileParent(UserInfo currentUserInfo) {
final int ownerUserId;
if (!currentUserInfo.isRestricted()) {
ownerUserId = currentUserInfo.id;
} else if (currentUserInfo.restrictedProfileParentId == UserInfo.NO_PROFILE_GROUP_ID) {
ownerUserId = UserHandle.USER_SYSTEM;
} else {
ownerUserId = currentUserInfo.restrictedProfileParentId;
}
return ownerUserId;
}
}
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