dschadow/ApplicationIntrusionDetection

/*
 * Copyright (C) 2016 Dominik Schadow, dominikschadow@gmail.com
 *
 * This file is part of the Application Intrusion Detection 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 de.dominikschadow.dukeencounters.user;

import de.dominikschadow.dukeencounters.Constants;
import de.dominikschadow.dukeencounters.encounter.DukeEncountersUser;
import de.dominikschadow.dukeencounters.security.SecurityValidationService;
import lombok.AllArgsConstructor;
import org.owasp.appsensor.core.DetectionPoint;
import org.owasp.appsensor.core.DetectionSystem;
import org.owasp.appsensor.core.Event;
import org.owasp.appsensor.core.event.EventManager;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import org.springframework.validation.beanvalidation.SpringValidatorAdapter;

import static org.owasp.appsensor.core.DetectionPoint.Category.COMMAND_INJECTION;
import static org.owasp.appsensor.core.DetectionPoint.Category.INPUT_VALIDATION;

/**
 * Validates an user: checks required fields and scans for basic Cross-Site Scripting and SQL Injection payload.
 *
 * @author Dominik Schadow
 */
@Component
@AllArgsConstructor
public class DukeEncountersUserValidator implements Validator {
    private final SpringValidatorAdapter validator;
    private final EventManager ids;
    private final UserService userService;
    private final SecurityValidationService securityValidationService;
    private final DetectionSystem detectionSystem;

    @Override
    public boolean supports(final Class<?> clazz) {
        return DukeEncountersUser.class.equals(clazz);
    }

    @Override
    public void validate(final Object target, final Errors errors) {
        validator.validate(target, errors);

        DukeEncountersUser user = (DukeEncountersUser) target;

        if (securityValidationService.hasXssPayload(user.getFirstname())) {
            fireXssEvent();
            errors.rejectValue("firstname", Constants.XSS_ERROR_CODE);
        } else if (securityValidationService.hasSqlIPayload(user.getFirstname())) {
            fireSqlIEvent();
            errors.rejectValue("firstname", Constants.SQLI_ERROR_CODE);
        }

        if (securityValidationService.hasXssPayload(user.getLastname())) {
            fireXssEvent();
            errors.rejectValue("lastname", Constants.XSS_ERROR_CODE);
        } else if (securityValidationService.hasSqlIPayload(user.getLastname())) {
            fireSqlIEvent();
            errors.rejectValue("lastname", Constants.SQLI_ERROR_CODE);
        }

        if (securityValidationService.hasXssPayload(user.getUsername())) {
            fireXssEvent();
            errors.rejectValue("username", Constants.XSS_ERROR_CODE);
        } else if (securityValidationService.hasSqlIPayload(user.getUsername())) {
            fireSqlIEvent();
            errors.rejectValue("username", Constants.SQLI_ERROR_CODE);
        }

        if (securityValidationService.hasXssPayload(user.getEmail())) {
            fireXssEvent();
            errors.rejectValue("email", Constants.XSS_ERROR_CODE);
        } else if (securityValidationService.hasSqlIPayload(user.getEmail())) {
            fireSqlIEvent();
            errors.rejectValue("email", Constants.SQLI_ERROR_CODE);
        }

        if (!user.getPassword().equals(user.getConfirmPassword())) {
            errors.rejectValue("password", Constants.NOT_MATCHING_PASSWORDS_ERROR_CODE);
        }

        if (userService.findUser(user.getUsername()) != null) {
            errors.rejectValue("username", Constants.USERNAME_ALREADY_EXISTS);
        }
    }

    private void fireXssEvent() {
        DetectionPoint detectionPoint = new DetectionPoint(INPUT_VALIDATION, "IE1-001");
        ids.addEvent(new Event(userService.getUser(), detectionPoint, detectionSystem));
    }

    private void fireSqlIEvent() {
        DetectionPoint detectionPoint = new DetectionPoint(COMMAND_INJECTION, "CIE1-001");
        ids.addEvent(new Event(userService.getUser(), detectionPoint, detectionSystem));
    }
}