org.sonar.server.authentication.CsrfVerifier.java Source code

Introduction

Here is the source code for org.sonar.server.authentication.CsrfVerifier.java

Source

/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.server.authentication;

import java.math.BigInteger;
import java.security.SecureRandom;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.sonar.api.platform.Server;
import org.sonar.server.exceptions.UnauthorizedException;

import static org.apache.commons.codec.digest.DigestUtils.sha256Hex;
import static org.apache.commons.lang.StringUtils.isBlank;

public class CsrfVerifier {

    private static final String CSRF_STATE_COOKIE = "OAUTHSTATE";

    private final Server server;

    public CsrfVerifier(Server server) {
        this.server = server;
    }

    public String generateState(HttpServletResponse response) {
        // Create a state token to prevent request forgery.
        // Store it in the session for later validation.
        String state = new BigInteger(130, new SecureRandom()).toString(32);
        Cookie cookie = new Cookie(CSRF_STATE_COOKIE, sha256Hex(state));
        cookie.setPath("/");
        cookie.setHttpOnly(true);
        cookie.setMaxAge(-1);
        cookie.setSecure(server.isSecured());
        response.addCookie(cookie);
        return state;
    }

    public void verifyState(HttpServletRequest request, HttpServletResponse response) {
        Cookie stateCookie = null;
        Cookie[] cookies = request.getCookies();
        for (Cookie cookie : cookies) {
            if (CSRF_STATE_COOKIE.equals(cookie.getName())) {
                stateCookie = cookie;
            }
        }
        if (stateCookie == null) {
            throw new UnauthorizedException();
        }
        String hashInCookie = stateCookie.getValue();

        // remove cookie
        stateCookie.setValue(null);
        stateCookie.setMaxAge(0);
        stateCookie.setPath("/");
        response.addCookie(stateCookie);

        String stateInRequest = request.getParameter("state");
        if (isBlank(stateInRequest) || !sha256Hex(stateInRequest).equals(hashInCookie)) {
            throw new UnauthorizedException();
        }
    }
}