Java tutorial
package servlets.module.challenge; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.sql.Connection; import java.sql.PreparedStatement; import java.util.Locale; import java.util.ResourceBundle; import javax.servlet.ServletException; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.log4j.Logger; import org.apache.commons.codec.binary.Base64; import utils.ShepherdLogManager; import utils.Validate; import dbProcs.Database; /** * Session Management Challenge Three - Change Password * This is a level function - DOES NOT RETURN KEY * <br/><br/> * This file is part of the Security Shepherd Project. * * The Security Shepherd project is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version.<br/> * * The Security Shepherd project 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 General Public License for more details.<br/> * * You should have received a copy of the GNU General Public License * along with the Security Shepherd project. If not, see <http://www.gnu.org/licenses/>. * @author Mark Denihan * */ public class SessionManagement3ChangePassword extends HttpServlet { private static final long serialVersionUID = 1L; private static org.apache.log4j.Logger log = Logger.getLogger(SessionManagement3ChangePassword.class); private static String levelName = "Session Management Challenge Three (Change Password)"; public static String levelHash = "b467dbe3cd61babc0ec599fd0c67e359e6fe04e8cdc618d537808cbb693fee8a"; // private static String levelResult = ""; //This Servlet does not return a result /** * Function used by Session Management Challenge Three to change the password of the submitted user name specified in the "Current" cookie * @param current User cookie used to store the current user (encoded twice with base64) * @param newPassword the password which to use to update an accounts password */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //Setting IpAddress To Log and taking header for original IP if forwarded from proxy ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For")); HttpSession ses = request.getSession(true); //Translation Stuff Locale locale = new Locale(Validate.validateLanguage(request.getSession())); ResourceBundle errors = ResourceBundle.getBundle("i18n.servlets.errors", locale); ResourceBundle bundle = ResourceBundle .getBundle("i18n.servlets.challenges.sessionManagement.sessionManagement3", locale); if (Validate.validateSession(ses)) { ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"), ses.getAttribute("userName").toString()); log.debug(levelName + " servlet accessed by: " + ses.getAttribute("userName").toString()); PrintWriter out = response.getWriter(); out.print(getServletInfo()); String htmlOutput = new String(); log.debug(levelName + " - Change Password - Servlet"); try { log.debug("Getting Challenge Parameters"); Cookie userCookies[] = request.getCookies(); int i = 0; Cookie theCookie = null; for (i = 0; i < userCookies.length; i++) { if (userCookies[i].getName().compareTo("current") == 0) { theCookie = userCookies[i]; break; //End Loop, because we found the token } } Object passNewObj = request.getParameter("newPassword"); String subName = new String(); String subNewPass = new String(); if (theCookie != null) subName = theCookie.getValue(); if (passNewObj != null) subNewPass = (String) passNewObj; log.debug("subName = " + subName); //Base 64 Decode try { byte[] decodedName = Base64.decodeBase64(subName); subName = new String(decodedName, "UTF-8"); decodedName = Base64.decodeBase64(subName); subName = new String(decodedName, "UTF-8"); } catch (UnsupportedEncodingException e) { log.debug("Could not decode username"); subName = new String(); } log.debug("subName Decoded = " + subName); log.debug("subPass = " + subNewPass); if (subNewPass.length() >= 6) { log.debug("Getting ApplicationRoot"); String ApplicationRoot = getServletContext().getRealPath(""); Connection conn = Database.getChallengeConnection(ApplicationRoot, "BrokenAuthAndSessMangChalThree"); log.debug("Changing password for user: " + subName); log.debug("Changing password to: " + subNewPass); PreparedStatement callstmt; callstmt = conn.prepareStatement("UPDATE users SET userPassword = SHA(?) WHERE userName = ?"); callstmt.setString(1, subNewPass); callstmt.setString(2, subName); log.debug("Executing changePassword"); callstmt.execute(); log.debug("Committing changes made to database"); callstmt = conn.prepareStatement("COMMIT"); callstmt.execute(); log.debug("Changes committed."); htmlOutput = "<p>" + bundle.getString("reset.password") + "</p>"; } else { log.debug("invalid password submitted: " + subNewPass); htmlOutput = "<p>" + bundle.getString("reset.failed") + "</p>"; } log.debug("Outputting HTML"); out.write(htmlOutput); } catch (Exception e) { out.write(errors.getString("error.funky")); log.fatal(levelName + " - Change Password - " + e.toString()); } } else { log.error(levelName + " servlet accessed with no session"); } } }