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/*
* Copyright 2022 Anton Tananaev (anton@traccar.org)
*
* 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 org.traccar.api.security;
import com.google.inject.servlet.RequestScoped;
import org.traccar.model.BaseModel;
import org.traccar.model.Calendar;
import org.traccar.model.Command;
import org.traccar.model.Device;
import org.traccar.model.Group;
import org.traccar.model.GroupedModel;
import org.traccar.model.ManagedUser;
import org.traccar.model.ScheduledModel;
import org.traccar.model.Server;
import org.traccar.model.User;
import org.traccar.model.UserRestrictions;
import org.traccar.storage.Storage;
import org.traccar.storage.StorageException;
import org.traccar.storage.query.Columns;
import org.traccar.storage.query.Condition;
import org.traccar.storage.query.Request;
import javax.inject.Inject;
@RequestScoped
public class PermissionsService {
private final Storage storage;
private Server server;
private User user;
@Inject
public PermissionsService(Storage storage) {
this.storage = storage;
}
public Server getServer() throws StorageException {
if (server == null) {
server = storage.getObject(
Server.class, new Request(new Columns.All()));
}
return server;
}
public User getUser(long userId) throws StorageException {
if (user == null && userId > 0) {
if (userId == ServiceAccountUser.ID) {
user = new ServiceAccountUser();
} else {
user = storage.getObject(
User.class, new Request(new Columns.All(), new Condition.Equals("id", "id", userId)));
}
}
return user;
}
public boolean notAdmin(long userId) throws StorageException {
return !getUser(userId).getAdministrator();
}
public void checkAdmin(long userId) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator()) {
throw new SecurityException("Administrator access required");
}
}
public void checkManager(long userId) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator() && getUser(userId).getUserLimit() == 0) {
throw new SecurityException("Manager access required");
}
}
public interface CheckRestrictionCallback {
boolean denied(UserRestrictions userRestrictions);
}
public void checkRestriction(
long userId, CheckRestrictionCallback callback) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator()
&& (callback.denied(getServer()) || callback.denied(getUser(userId)))) {
throw new SecurityException("Operation restricted");
}
}
public void checkEdit(long userId, Class<?> clazz, boolean addition) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator()) {
boolean denied = false;
if (getServer().getReadonly() || getUser(userId).getReadonly()) {
denied = true;
} else if (clazz.equals(Device.class)) {
denied = getServer().getDeviceReadonly() || getUser(userId).getDeviceReadonly();
if (addition) {
int deviceCount = storage.getObjects(Device.class, new Request(
new Columns.Include("id"),
new Condition.Permission(User.class, userId, Device.class))).size();
denied = deviceCount >= getUser(userId).getDeviceLimit();
}
} else if (clazz.equals(Command.class)) {
denied = getServer().getLimitCommands() || getUser(userId).getLimitCommands();
}
if (denied) {
throw new SecurityException("Write access denied");
}
}
}
public void checkEdit(long userId, Object object, boolean addition) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator()) {
checkEdit(userId, object.getClass(), addition);
boolean denied = false;
if (object instanceof GroupedModel) {
long groupId = ((GroupedModel) object).getGroupId();
if (groupId > 0) {
checkPermission(Group.class, userId, groupId);
}
}
if (object instanceof ScheduledModel) {
long calendarId = ((ScheduledModel) object).getCalendarId();
if (calendarId > 0) {
denied = storage.getPermissions(User.class, userId, Calendar.class, calendarId).isEmpty();
}
}
if (denied) {
throw new SecurityException("Write access denied");
}
}
}
public void checkUser(long userId, long managedUserId) throws StorageException, SecurityException {
if (userId != managedUserId && !getUser(userId).getAdministrator()) {
if (!getUser(userId).getManager()
|| storage.getPermissions(User.class, userId, ManagedUser.class, managedUserId).isEmpty()) {
throw new SecurityException("User access denied");
}
}
}
public void checkUserUpdate(long userId, User before, User after) throws StorageException, SecurityException {
if (before.getAdministrator() != after.getAdministrator()
|| before.getDeviceLimit() != after.getDeviceLimit()
|| before.getUserLimit() != after.getUserLimit()) {
checkAdmin(userId);
}
User user = getUser(userId);
if (user != null && user.getExpirationTime() != null
&& (after.getExpirationTime() == null
|| user.getExpirationTime().compareTo(after.getExpirationTime()) < 0)) {
checkAdmin(userId);
}
if (before.getReadonly() != after.getReadonly()
|| before.getDeviceReadonly() != after.getDeviceReadonly()
|| before.getDisabled() != after.getDisabled()
|| before.getLimitCommands() != after.getLimitCommands()
|| before.getDisableReports() != after.getDisableReports()) {
if (userId == after.getId()) {
checkAdmin(userId);
} else {
checkUser(userId, after.getId());
}
}
}
public <T extends BaseModel> void checkPermission(
Class<T> clazz, long userId, long objectId) throws StorageException, SecurityException {
if (!getUser(userId).getAdministrator() && !(clazz.equals(User.class) && userId == objectId)) {
var object = storage.getObject(clazz, new Request(
new Columns.Include("id"),
new Condition.And(
new Condition.Equals("id", "id", objectId),
new Condition.Permission(
User.class, userId, clazz.equals(User.class) ? ManagedUser.class : clazz))));
if (object == null) {
throw new SecurityException(clazz.getSimpleName() + " access denied");
}
}
}
}
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