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.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Locale; import java.util.ResourceBundle; import javax.servlet.ServletException; 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 Five - 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 SessionManagement5ChangePassword extends HttpServlet { private static final long serialVersionUID = 1L; private static org.apache.log4j.Logger log = Logger.getLogger(SessionManagement5ChangePassword.class); private static String levelName = "Session Management Challenge Five (Change Password)"; // private static String levelResult = ""; //This Servlet does not return a result /** * Function used by Session Management Challenge Five to change the password of the submitted user name. The function requires a valid token which is a base64'd timestamp. If the current time is within 10 minutes of the token, the function will execute * @param userName User cookie used to store the user password to be reset * @param newPassword the password which to use to update an accounts password * @param resetPasswordToken Base64'd time stamp */ 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.sessionManagement5", 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(); String errorMessage = new String(); int tokenLife = 11; try { log.debug("Getting Challenge Parameters"); Object passNewObj = request.getParameter("newPassword"); Object userNewObj = request.getParameter("userName"); Object tokenObj = request.getParameter("resetPasswordToken"); String userName = new String(); String newPass = new String(); String token = new String(); if (passNewObj != null) newPass = (String) passNewObj; if (userNewObj != null) userName = (String) userNewObj; if (tokenObj != null) token = (String) tokenObj; log.debug("userName = " + userName); log.debug("newPass = " + newPass); log.debug("token = " + token); String tokenTime = new String(); try { byte[] decodedToken = Base64.decodeBase64(token); tokenTime = new String(decodedToken, "UTF-8"); } catch (UnsupportedEncodingException e) { log.debug("Could not decode password token"); errorMessage += "<p>" + bundle.getString("changePass.noDecode") + "</p>"; } if (tokenTime.isEmpty()) { log.debug("Could not decode token. Ending Servlet."); out.write(errorMessage); } else { log.debug("Decoded Token = " + tokenTime); //Get Time from Token and see if it is inside the last 10 minutes SimpleDateFormat simpleDateFormat = new SimpleDateFormat("EEE MMM d HH:mm:ss Z yyyy"); try { Date tokenDateTime = simpleDateFormat.parse(tokenTime); Date currentDateTime = new Date(); //Get difference in minutes tokenLife = (int) ((currentDateTime.getTime() / 60000) - (tokenDateTime.getTime() / 60000)); log.debug("Token life = " + tokenLife); } catch (ParseException e) { log.error("Date Parsing Error: " + e.toString()); errorMessage += bundle.getString("changePass.badTokenData") + ": " + e.toString(); } if (tokenLife < 10 && tokenLife >= 0) { if (newPass.length() >= 12) { log.debug("Getting ApplicationRoot"); String ApplicationRoot = getServletContext().getRealPath(""); log.debug("Servlet root = " + ApplicationRoot); Connection conn = Database.getChallengeConnection(ApplicationRoot, "BrokenAuthAndSessMangChalFive"); log.debug("Changing password for user: " + userName); log.debug("Changing password to: " + newPass); PreparedStatement callstmt; callstmt = conn .prepareStatement("UPDATE users SET userPassword = SHA(?) WHERE userName = ?"); callstmt.setString(1, newPass); callstmt.setString(2, userName); 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("changePass.success") + "</p>"; } else { log.debug("Invalid password submitted: " + newPass); htmlOutput = "<p>" + bundle.getString("changePass.failure") + "</p>"; } } else { if (!errorMessage.isEmpty()) { htmlOutput = "<p><font colour='red'><b>" + errorMessage + "</b></font</p>"; } else if (tokenLife >= 10) { log.debug("Token too old"); htmlOutput = "<p>" + bundle.getString("changePass.oldToken") + "</p>"; } else if (tokenLife < 0) { log.debug("Token to young"); htmlOutput = "<p>" + bundle.getString("changePass.youngToken") + "</p>"; } else { log.error("Token to Strange: Unexpected Error"); htmlOutput = "<p>" + bundle.getString("changePass.funkyToken") + "</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"); } } }