implemented resetting passwords

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

src/main/java/de/srsoftware/widerhall/Constants.java

@@ -21,8 +21,10 @@ public class Constants {
     public static final String MESSAGE_ID = "message_id";
     public static final String MODERATOR = "moderator";
     public static final String MONTH = "month";
+    public static final String NEW_PASSWORD_FORM = "new_password_form";
     public static final String NOTES = "notes";
     public static final String PASSWORD = "password";
+    public static final String PASSWORD_REPEAT = "password-repeat";
     public static final String PERMISSIONS = "permissions";
     public static final Object PORT = "port";
     public static final String PREFIX = "prefix";

src/main/java/de/srsoftware/widerhall/Util.java

@@ -4,12 +4,9 @@ import de.srsoftware.tools.translations.Translation;
 import de.srsoftware.widerhall.data.MailingList;
 import de.srsoftware.widerhall.data.User;
 
-import javax.mail.Message;
 import javax.mail.MessagingException;
 import javax.mail.Multipart;
 import javax.mail.Part;
-import javax.mail.internet.AddressException;
-import javax.mail.internet.InternetAddress;
 import javax.servlet.http.HttpServletRequest;
 import java.io.IOException;
 import java.net.URLEncoder;
@@ -19,6 +16,7 @@ import java.security.NoSuchAlgorithmException;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.Map;
+import java.util.Random;
 import java.util.stream.Collectors;
 
 import static de.srsoftware.widerhall.Constants.*;
@@ -28,6 +26,14 @@ public class Util {
     private static final MessageDigest SHA256 = getSha256();
     private static final String EMAIL_PATTERN = "^[a-zA-Z0-9_!#$%&'*+/=?`{|}~^-]+(?:\\.[a-zA-Z0-9_!#$%&'*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$";
 
+    public static char boundedChar(int i) {
+        i = (i<0 ? -i : i) % 62;
+        i += '0';
+        if (i>57) i+=7;
+        if (i>90) i+=6;
+        return (char) i;
+    }
+
     public static String dropEmail(String tx) {
         return tx.replaceAll( "[.\\-\\w]+@[.\\-\\w]+", "[email_removed]");
     }
@@ -119,6 +125,18 @@ public class Util {
         return email.matches(EMAIL_PATTERN);
     }
 
+    public static String randomString(int length) {
+        Random rand = new Random();
+        StringBuilder sb = new StringBuilder();
+        for (int i=0; i<length; i++) {
+            int k = rand.nextInt();
+            char c = boundedChar(k);
+            System.out.println("adding '"+c+"'…");
+            sb.append(c);
+        }
+        return sb.toString();
+    }
+
     public static String sha256(String s) {
         byte[] bytes = SHA256.digest(s.getBytes(StandardCharsets.UTF_8));
         return hex(bytes);

src/main/java/de/srsoftware/widerhall/data/Database.java

@@ -10,6 +10,7 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.*;
 
+import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Util.t;
 import static de.srsoftware.widerhall.data.MailingList.HOLD_TIME;
 
@@ -19,6 +20,7 @@ import static de.srsoftware.widerhall.data.MailingList.HOLD_TIME;
  */
 public class Database {
     private static final Logger LOG = LoggerFactory.getLogger(Database.class);
+    private static final String DB_VERSION = "db_version";
     private static Database singleton = null; // we only need one db handle ever. This will be it.
     private final Connection conn; // the actual db connection handle within the singleton
 
@@ -295,6 +297,14 @@ public class Database {
         return this;
     }
 
+    private void createVersionTable() throws SQLException {
+            var sql = "CREATE TABLE %s (%s %s NOT NULL PRIMARY KEY);".formatted(DB_VERSION,DB_VERSION,INT);
+            var db = Database.open();
+            db.query(sql).compile().run();
+            sql = "INSERT INTO %s VALUES (1)".formatted(DB_VERSION);
+            db.query(sql).compile().run();
+    }
+
     private boolean columnExists(String tableName, String columnName) throws SQLException {
         var rs = Database.open().select("pragma_table_info('"+tableName+"')","COUNT(*) AS num").where("name",columnName).compile().exec();
         try {
@@ -357,6 +367,7 @@ public class Database {
             try {
                 singleton = new Database(DriverManager.getConnection(url));
                 singleton.assertTables(); // must not be concatenated to exception above (assertTables accesses singleton)!
+                singleton.update202405();
             } catch (SQLException sqle) {
                 sqle.printStackTrace();
             }
@@ -373,6 +384,10 @@ public class Database {
         return new Request(sql);
     }
 
+    public Request query(String sql) {
+        return new Request(new StringBuilder(sql));
+    }
+
     /**
      * create a SELECT [flields] FROM [table] request.
      * If no fields are supplied, a request in the form SELECT * FROM [table] will be generated.
@@ -390,7 +405,6 @@ public class Database {
         return new Request(sql.append(" FROM ").append(tableName));
     }
 
-
     /**
      * check, whether a table with the provided name exists
      * @param tbName
@@ -420,4 +434,12 @@ public class Database {
     public Request update(String tableName) {
         return new Request(new StringBuilder("UPDATE ").append(tableName));
     }
+
+    private Database update202405() throws SQLException {
+        if (!tableExists(Database.DB_VERSION)) {
+            createVersionTable();
+            User.addTokenColumn();
+        }
+        return this;
+    }
 }

src/main/java/de/srsoftware/widerhall/data/MailingList.java

@@ -49,8 +49,8 @@ public class MailingList implements MessageHandler, ProblemListener {
     private static final String SMTP_PASS = "smtp_pass";
     public static final String TABLE_NAME = "Lists";
     private static final int STATE_PENDING = 0;
-    private static final int STATE_ENABLED = 1; // do we process incoming messages?
-    private static final int STATE_PUBLIC = 2; // can guests see this ML?
+    public static final int STATE_ENABLED = 1; // do we process incoming messages?
+    public static final int STATE_PUBLIC = 2; // can guests see this ML?
     public static final int STATE_FORWARD_FROM = 4; // set original sender as FROM when forwarding?
     public static final int STATE_FORWARD_ATTACHED = 8; // forward messages as attachment?
     public static final int STATE_HIDE_RECEIVERS = 16; // send using BCC receivers
@@ -283,6 +283,18 @@ public class MailingList implements MessageHandler, ProblemListener {
         return hasState(STATE_OPEN_FOR_GUESTS|STATE_OPEN_FOR_SUBSCRIBERS);
     }
 
+    public static List<MailingList> listActive() {
+        try {
+            var list = new ArrayList<MailingList>();
+            var rs = Database.open().select(TABLE_NAME).where(STATE+" % 2",1).compile().exec();
+            while (rs.next()) list.add(MailingList.from(rs));
+            return list;
+        } catch (SQLException e){
+            LOG.debug("Failed to load active MailingLists");
+        }
+        return List.of();
+    }
+
     /**
      * Load a ML object by it's identifying email address.
      * This is a cached method: if the ML has been loaded before, the already-loaded object will be returned.
@@ -308,6 +320,7 @@ public class MailingList implements MessageHandler, ProblemListener {
         return ml;
     }
 
+
     /**
      * Load a ML object by it's identifying email address.
      * This is a cached method: if the ML has been loaded before, the already-loaded object will be returned.
@@ -679,6 +692,10 @@ public class MailingList implements MessageHandler, ProblemListener {
         }
     }
 
+    public void sendPasswordReset(String email, String subject,String text) throws MessagingException, UnsupportedEncodingException {
+        smtp.send(email(),name(),email,subject,text);
+    }
+
     protected SmtpClient smtp(){
         return smtp;
     }

src/main/java/de/srsoftware/widerhall/data/User.java

@@ -6,6 +6,7 @@ import java.security.InvalidKeyException;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.*;
 
 import static de.srsoftware.widerhall.Constants.*;
@@ -20,10 +21,11 @@ public class User {
     public static final int PERMISSION_ADMIN = 1;
     public static final int PERMISSION_CREATE_LISTS = 2;
     public static final String HASHED_PASS = "hashedPassword";
+    public static final String RESET_TOKEN = "resetToken";
     public static final String SALT = "salt";
     private static final HashMap<String,User> users = new HashMap<>();
 
-    private String email, salt, hashedPass, name;
+    private String email, salt, hashedPass, name, token;
     private int permissions;
 
     /**
@@ -34,11 +36,12 @@ public class User {
      * @param hashedPass
      * @param permissions
      */
-    public User(String email, String name, String salt, String hashedPass, int permissions) {
+    public User(String email, String name, String salt, String hashedPass, String token, int permissions) {
         this.email = email.toLowerCase();
         this.name = name;
         this.salt = salt;
         this.hashedPass = hashedPass;
+        this.token = token;
         this.permissions = permissions;
     }
 
@@ -81,6 +84,21 @@ public class User {
                 .run();
     }
 
+    public static void addTokenColumn() throws SQLException {
+        String sql = "ALTER TABLE %s ADD COLUMN %s %s;".formatted(TABLE_NAME,RESET_TOKEN,VARCHAR);
+        Database.open().query(sql).compile().run();
+    }
+
+    public static User byToken(String token) throws SQLException {
+        if (token == null || token.isBlank()) return null;
+        var rs = Database.open().select(TABLE_NAME).where(RESET_TOKEN,token).compile().exec();
+        try {
+            if (rs.next()) return User.from(rs);
+            return null;
+        } finally {
+            rs.close();
+        }
+    }
 
     /**
      * Create a new user object by hashing it's password and storing user data, salt and hashed password to the db.
@@ -96,10 +114,10 @@ public class User {
         String salt = null;
         String hashedPass = null;
         if (password != null) {
-            salt = Util.sha256(email + name + LocalDate.now());
+            salt = Util.sha256(email + LocalDateTime.now() + name);
             hashedPass = Util.sha256(password + salt);
         }
-        return new User(email,name,salt,hashedPass,0).save();
+        return new User(email,name,salt,hashedPass,null,0).save();
     }
 
     /**
@@ -115,7 +133,6 @@ public class User {
                 .append(PERMISSIONS).append(" ").append(INT).append(", ")
                 .append(SALT).append(" ").append(VARCHAR).append(", ")
                 .append(HASHED_PASS).append(" ").append(VARCHAR)
-
                 .append(");");
         Database.open().query(sql).compile().run();
     }
@@ -195,10 +212,16 @@ public class User {
                 rs.getString(NAME),
                 rs.getString(SALT),
                 rs.getString(HASHED_PASS),
+                rs.getString(RESET_TOKEN),
                 rs.getInt(PERMISSIONS)));
         return user;
     }
 
+    public String generateToken() throws SQLException {
+        token = Util.randomString(64);
+        Database.open().update(TABLE_NAME).set(RESET_TOKEN,token).where(EMAIL,this.email).compile().run();
+        return token;
+    }
 
     /**
      * Loads the user identified by it's email, but only if the provided password matches.
@@ -284,4 +307,18 @@ public class User {
         req.compile().run();
         return this;
     }
+
+    public void setPassword(String newPassword) throws SQLException {
+        if (newPassword != null) {
+            String newSalt = Util.sha256(email + LocalDateTime.now() + name);
+            String newHashedPass = Util.sha256(newPassword + newSalt);
+            Database.open().update(TABLE_NAME).set(HASHED_PASS,newHashedPass).set(SALT,newSalt).where(EMAIL,email).compile().run();
+            hashedPass = newHashedPass;
+            salt = newSalt;
+        }
+    }
+
+    public String token() {
+        return token;
+    }
 }

src/main/java/de/srsoftware/widerhall/web/Web.java

@@ -15,8 +15,7 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.security.InvalidKeyException;
 import java.sql.SQLException;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.*;
 
 import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Util.t;
@@ -37,6 +36,7 @@ public class Web extends TemplateServlet {
     private static final String POST = "post";
     private static final String REGISTER = "register";
     private static final String RELOAD = "reload";
+    private static final String RESET_PASSWORD = "reset-pw";
     private static final String SUBSCRIBE = "subscribe";
     private static final String UNSUBSCRIBE = "unsubscribe";
     private static final String IMAP_HOST = "imap_host";
@@ -49,7 +49,7 @@ public class Web extends TemplateServlet {
     private static final String SMTP_PASS = "smtp_pass";
     private static final int PRIMARY_KEY_CONSTRAINT = 19;
 
-    private String addList(HttpServletRequest req, HttpServletResponse resp) {
+    private String addList(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
         var user = Util.getUser(req);
         if (user == null) return redirectTo(LOGIN,resp);
         var data = new HashMap<String, Object>();
@@ -139,15 +139,16 @@ public class Web extends TemplateServlet {
         var allowed = list.hasPublicArchive() || list.mayBeAlteredBy(user);
         if (!allowed) return t("You are not allowed to access the archive of this list");
 
-        var map = new HashMap<String,Object>();
-        map.put(LIST,list.email());
+        var data = new HashMap<String,Object>();
+        if (user != null) data.put(USER,user);
+        data.put(LIST,list.email());
 
         var month = req.getParameter(MONTH);
         if (month != null && !month.isBlank()){
-            map.put(MONTH,month);
-            map.put(MODERATOR,list.mayBeAlteredBy(user));
+            data.put(MONTH,month);
+            data.put(MODERATOR,list.mayBeAlteredBy(user));
         }
-        return loadTemplate(ARCHIVE,map,resp);
+        return loadTemplate(ARCHIVE,data,resp);
     }
 
     private String confirm(HttpServletRequest req, HttpServletResponse resp) {
@@ -169,17 +170,17 @@ public class Web extends TemplateServlet {
 
     @Override
     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
-        String error = handleGet(req, resp);
+        String error = handleRequest(req, resp, true);
         if (error != null) resp.sendError(400,error);
     }
 
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException {
-        String error = handlePost(req, resp);
+        String error = handleRequest(req, resp, false);
         if (error != null) resp.sendError(400,error);
     }
 
-    public String editList(HttpServletRequest req, HttpServletResponse resp) {
+    public String editList(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
         var user = Util.getUser(req);
         if (user == null) return redirectTo(LOGIN,resp);
 
@@ -188,6 +189,7 @@ public class Web extends TemplateServlet {
 
         var list = Util.getMailingList(req);
         data.put(LIST,list.safeMap());
+        if (isGet) return loadTemplate(EDIT_LIST,data,resp);
         try {
             var allowed = user.hashPermission(PERMISSION_ADMIN) || ListMember.load(list,user).isOwner();
             if (!allowed) return loadTemplate(ADMIN,data,resp);
@@ -273,11 +275,56 @@ public class Web extends TemplateServlet {
         return sqle;
     }
 
-    private User getSessionUser(HttpServletRequest req) {
-        return req.getSession().getAttribute(USER) instanceof User user ? user : null;
+    private String handleLogin(HttpServletRequest req, HttpServletResponse resp,boolean isGet) {
+        if (isGet) return loadTemplate(LOGIN,null,resp);
+        var email = req.getParameter("email");
+        var pass = req.getParameter("pass");
+        if (email == null || pass == null) return loadTemplate(LOGIN, Map.of("error",t("Missing username or password!")), resp);
+        if (!Util.isEmail(email)) return loadTemplate(LOGIN, Map.of("error",t("'{}' is not a valid email address!",email)), resp);
+        try {
+            var user = User.loadUser(email,pass);
+            req.getSession().setAttribute("user",user);
+            // loading user successfull: goto index
+            resp.sendRedirect(String.join("/",WEB_ROOT,"admin"));
+        } catch (Exception e) {
+            try {
+                LOG.warn("Static.handleLogin failed:",e);
+                Thread.sleep(10000);
+            } finally {
+                return loadTemplate("login", Map.of(ERROR,t("Invalid username/password"),EMAIL,email), resp);
+            }
+        }
+        return null;
     }
 
-    private String handleGet(HttpServletRequest req, HttpServletResponse resp) {
+    private String handleNewPassword(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
+        var user = Util.getUser(req);
+        if (user == null) return redirectTo(LOGIN,resp);
+        var data = new HashMap<String,Object>();
+        data.put(USER,user.safeMap());
+        if (!isGet) {
+            var pass = req.getParameter(PASSWORD);
+            var repeat = req.getParameter(PASSWORD_REPEAT);
+            if (pass == null || pass.isBlank()) {
+                data.put(ERROR, "Please set a password!");
+            } else if (!pass.equals(repeat)) {
+                data.put(ERROR, "Passwords do not match");
+            } else if (Util.simplePassword(pass)) {
+                data.put(ERROR, "Your password is to simple");
+            } else {
+                try {
+                    user.setPassword(pass);
+                    data.put(NOTES,"Your password has been updated!");
+                    return loadTemplate(ADMIN,data,resp);
+                } catch (SQLException e) {
+                    data.put(ERROR,t("Failed to update password in database: {}",e.getMessage()));
+                }
+            }
+        }
+        return loadTemplate(NEW_PASSWORD_FORM,data,resp);
+    }
+
+    private String handleRequest(HttpServletRequest req, HttpServletResponse resp, boolean isGet){
         var path = Util.getPath(req);
         var user = Util.getUser(req);
         var data = new HashMap<String,Object>();
@@ -285,39 +332,75 @@ public class Web extends TemplateServlet {
 
         if (user != null) data.put(USER,user.safeMap());
         if (list != null) data.put(LIST,list.minimalMap());
+        var interesting = !Set.of("js","jquery","css","OpenSans-Regular.woff","Bhineka.ttf").contains(path);
+        LOG.debug("{}",interesting?"interesting":"boring");
+        if (user != null){
+            switch (path){
+                case ADD_LIST:
+                    return addList(req,resp,isGet);
+                case ADMIN:
+                    return loadTemplate(path,data,resp);
+                case EDIT_LIST:
+                    return editList(req,resp,isGet);
+                case INSPECT:
+                    return inspect(req,resp,isGet);
+                case NEW_PASSWORD_FORM:
+                    return handleNewPassword(req,resp,isGet);
+            }
+        }
         switch (path){
             case ARCHIVE:
                 return archive(list,user,req,resp);
+            case CSS:
+            case INDEX:
+                return loadTemplate(path,data,resp);
             case CONFIRM:
                 return confirm(req,resp);
+            case LOGIN:
+                return handleLogin(req,resp,isGet);
+            case LOGOUT:
+                req.getSession().invalidate();
+                return redirectTo(INDEX,resp);
             case POST:
                 return post(req,resp);
+            case REGISTER:
+                return registerUser(req,resp,isGet);
             case RELOAD:
                 loadTemplates();
                 data.put(NOTES,t("Templates have been reloaded!"));
-                path = INDEX;
-            case CSS:
-            case INDEX:
-                return loadTemplate(path,data,resp);
+                return loadTemplate(INDEX,data,resp);
+            case RESET_PASSWORD:
+                if (!isGet) return resetPassword(req,resp);
+                // TODO: move following code into resetPassword method
+                try {
+                    user = User.byToken(req.getParameter(TOKEN));
+                    if (user != null) {
+                        req.getSession().setAttribute("user",user);
+                        return redirectTo(NEW_PASSWORD_FORM,resp);
+                    }
+                } catch (SQLException sqle){
+                    return loadTemplate(path,Map.of(ERROR,"Failed to add user for token!"),resp);
+                }
+                var email = req.getParameter(EMAIL);
+                return loadTemplate(path,email == null ? null : Map.of(EMAIL,email),resp);
+
             case SUBSCRIBE:
+                if (!isGet) {
+                    return subscribe(req, resp);
+                } // TODO: Code für GET-Request mit in subscribe-Methode verschieben
                 if (list.isOpenFor(user)) {
                     data.put(LIST,list.email());
                     return loadTemplate(path, data, resp);
                 }
                 return t("You are not allowed to subscribe to '{}'!",list.email());
+            case UNSUBSCRIBE:
+                return unsubscribe(req,resp,isGet);
+        }
+        /* uninteresting paths */
+        switch (path){
             case "js":
                 resp.setContentType("text/javascript");
                 return loadTemplate(path,data,resp);
-            case LOGIN:
-                try {
-                    if (User.noUsers()) return loadTemplate(REGISTER, Map.of(NOTES,t("User database is empty. Create admin user first:")), resp);
-                    return loadTemplate(path,null,resp);
-                } catch (SQLException e) {
-                    return "Error reading user database!";
-                }
-            case LOGOUT:
-                req.getSession().invalidate();
-                return redirectTo(INDEX,resp);
             case "jquery":
                 resp.setContentType("text/javascript");
                 return loadFile("jquery-3.6.0.min.js",resp);
@@ -329,69 +412,16 @@ public class Web extends TemplateServlet {
                 return loadFile("Bhineka.ttf",resp);            case UNSUBSCRIBE:
                 data.put(LIST,list.email());
                 return loadTemplate(path,data,resp);
-
-        }
-
-        if (user != null){
-            if (list != null) data.put(LIST,req.getParameter(LIST));
-            switch (path){
-                case EDIT_LIST:
-                    return editList(req,resp);
-            }
-            return loadTemplate(path,data,resp);
         }
         return redirectTo(LOGIN,resp);
     }
 
-    private String handleLogin(HttpServletRequest req, HttpServletResponse resp) {
-        var email = req.getParameter("email");
-        var pass = req.getParameter("pass");
-        if (email == null || pass == null) return loadTemplate("login", Map.of("error",t("Missing username or password!")), resp);
-        if (!Util.isEmail(email)) return loadTemplate("login", Map.of("error",t("'{}' is not a valid email address!",email)), resp);
-        try {
-            var user = User.loadUser(email,pass);
-            req.getSession().setAttribute("user",user);
-            // loading user successfull: goto index
-            resp.sendRedirect(String.join("/",WEB_ROOT,"admin"));
-        } catch (Exception e) {
-            try {
-                LOG.warn("Static.handleLogin failed:",e);
-                Thread.sleep(10000);
-            } finally {
-                return loadTemplate("login", Map.of(ERROR,t("Invalid username/password"),EMAIL,email), resp);
-            }
-        }
-        return null;
-    }
-
-    private String handlePost(HttpServletRequest req, HttpServletResponse resp) {
-        final var path = Util.getPath(req);
-
-        switch (path){
-            case ADD_LIST:
-                return addList(req,resp);
-            case EDIT_LIST:
-                return editList(req,resp);
-            case INSPECT:
-                return inspect(req,resp);
-            case LOGIN:
-                return handleLogin(req,resp);
-            case REGISTER:
-                return registerUser(req,resp);
-            case SUBSCRIBE:
-                return subscribe(req,resp);
-            case UNSUBSCRIBE:
-                return unsubscribe(req,resp);
-        }
-
-        return t("No handler for path {}!",path);
-    }
-
-    private String inspect(HttpServletRequest req, HttpServletResponse resp) {
+    private String inspect(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
         var user = Util.getUser(req);
         if (user == null) return redirectTo(LOGIN,resp);
 
         var data = new HashMap<String,Object>();
+        data.put(USER,user);
         var error = false;
 
         var list = Util.getMailingList(req);
@@ -399,6 +429,7 @@ public class Web extends TemplateServlet {
             error = true;
             data.put(ERROR, t("No valid mailing list provided!"));
         } else data.put(LIST, list.email());
+        if (isGet) return loadTemplate(INSPECT,data,resp);
 
         if (!error && !list.mayBeAlteredBy(user)) {
             error = true;
@@ -451,10 +482,8 @@ public class Web extends TemplateServlet {
         }
     }
 
-
-
-    private String registerUser(HttpServletRequest req, HttpServletResponse resp) {
-
+    private String registerUser(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
+        if (isGet) return loadTemplate(REGISTER,null,resp);
         var email = req.getParameter("email");
         var pass = req.getParameter("pass");
         var pass_repeat = req.getParameter("pass_repeat");
@@ -463,9 +492,9 @@ public class Web extends TemplateServlet {
         if (email == null || email.isBlank() ||
                 name == null || name.isBlank() ||
                 pass == null || pass.isBlank() ||
-	    pass_repeat == null || pass_repeat.isBlank()) return loadTemplate(REGISTER,Map.of(ERROR,t("Fill all fields, please!"),NAME,name,EMAIL,email),resp);
-    if (!pass.equals(pass_repeat)) return loadTemplate(REGISTER,Map.of(ERROR,t("Passwords do not match!"),NAME,name,EMAIL,email),resp);
-    if (Util.simplePassword(pass)) return loadTemplate(REGISTER,Map.of(ERROR,t("Password to short or to simple!"),NAME,name,EMAIL,email),resp);
+                pass_repeat == null || pass_repeat.isBlank()) return loadTemplate(REGISTER,Map.of(ERROR,t("Fill all fields, please!"),NAME,name,EMAIL,email),resp);
+        if (!pass.equals(pass_repeat)) return loadTemplate(REGISTER,Map.of(ERROR,t("Passwords do not match!"),NAME,name,EMAIL,email),resp);
+        if (Util.simplePassword(pass)) return loadTemplate(REGISTER,Map.of(ERROR,t("Password to short or to simple!"),NAME,name,EMAIL,email),resp);
 
         var firstUser = false;
         try {
@@ -474,7 +503,6 @@ public class Web extends TemplateServlet {
             return t("Failed to access user database: {}",e.getMessage());
         }
 
-
         try {
             var user = User.create(email, name, pass);
             if (firstUser) user.addPermission(PERMISSION_ADMIN|User.PERMISSION_CREATE_LISTS);
@@ -486,6 +514,33 @@ public class Web extends TemplateServlet {
         }
     }
 
+    private String resetPassword(HttpServletRequest req, HttpServletResponse resp) {
+            var email = req.getParameter("email");
+            if (email == null) return loadTemplate("login", Map.of("error",t("Missing email address!")), resp);
+            if (!Util.isEmail(email)) return loadTemplate("login", Map.of("error",t("'{}' is not a valid email address!",email)), resp);
+
+            try {
+                var user = User.load(email);
+                if (user != null) {
+                    MailingList list = ListMember.listsOf(user).stream().map(ListMember::list).filter(ml -> ml.hasState(STATE_ENABLED)).findAny().orElse(null);
+                    if (list == null) list = MailingList.listActive().stream().findAny().orElse(null);
+                    if (list == null) throw new NullPointerException("no active List found!");
+                    String token = user.generateToken();
+                    var host = Arrays.stream(req.getRequestURL().toString().split("/")).filter(s -> !s.isEmpty() && !s.startsWith("http")).findFirst().orElse("unknwon host");
+
+                    var link = req.getRequestURL().toString()+"?token="+token;
+                    var subject = t("Reset your password at {}",host);
+                    var text = t("Somebody asked to reset your account password at {}.\n\nIf that was you, please open the following link in your web browser:\n\n{}\n\nIf you did not expect this email, please ignore it.",host,link);
+
+                    list.sendPasswordReset(email,subject,text);
+                    return loadTemplate("reset_link_sent",null,resp);
+                }
+            } catch (Exception e){
+                return loadTemplate(Util.getPath(req),Map.of(EMAIL,email,ERROR,"Failed to send reset email: "+e.getMessage()),resp);
+            }
+        return null;
+    }
+
     private String subscribe(HttpServletRequest req, HttpServletResponse resp) {
         var name = req.getParameter(NAME);
         var email = req.getParameter(EMAIL);
@@ -517,6 +572,7 @@ public class Web extends TemplateServlet {
             int code = cause.getErrorCode();
             if (code == PRIMARY_KEY_CONSTRAINT) try {// user already exists
                 user = User.loadUser(email,pass);
+                req.getSession().setAttribute("user",user);
                 skipConfirmation = pass != null; // subscription with email address already known to database
                 // success → subscribe
             } catch (InvalidKeyException | SQLException e) {
@@ -555,11 +611,9 @@ public class Web extends TemplateServlet {
         }
     }
 
-
-
-    private String unsubscribe(HttpServletRequest req, HttpServletResponse resp) {
+    private String unsubscribe(HttpServletRequest req, HttpServletResponse resp, boolean isGet) {
         var data = new HashMap<String,Object>();
-        var user = getSessionUser(req);
+        var user = Util.getUser(req);
         var email = req.getParameter(EMAIL);
         var list = Util.getMailingList(req);
         data.put(EMAIL,email);
@@ -568,6 +622,7 @@ public class Web extends TemplateServlet {
             data.put(ERROR,t("No list provided by form data!"));
             return loadTemplate(UNSUBSCRIBE,data,resp);
         } else data.put(LIST,list.email());
+        if (isGet) return loadTemplate(UNSUBSCRIBE,data,resp);
         if (user == null) {
             if (email == null || email.isBlank()) {
                 data.put(ERROR, t("Email is required for list un-subscription!"));
@@ -607,7 +662,6 @@ public class Web extends TemplateServlet {
             LOG.warn("Problem during unscubsription of {} from {}:",user.email(),list.email(),e);
             data.put(ERROR,"Failed to unsubscribe!");
             return loadTemplate(UNSUBSCRIBE,data,resp);
-
         }
     }
 }

src/test/java/de/srsoftware/widerhall/UtilTest.java

@@ -4,6 +4,7 @@ import junit.framework.TestCase;
 
 import java.util.Map;
 import java.util.TreeMap;
+import static de.srsoftware.widerhall.Util.*;
 
 public class UtilTest extends TestCase {
 
@@ -17,17 +18,17 @@ public class UtilTest extends TestCase {
     }
 
     public void testHex(){
-        assertEquals("00",Util.hex(0));
-        assertEquals("09",Util.hex(9));
-        assertEquals("0A",Util.hex(10));
-        assertEquals("0F",Util.hex(15));
-        assertEquals("10",Util.hex(16));
-        assertEquals("19",Util.hex(25));
-        assertEquals("FF",Util.hex(255));
+        assertEquals("00",hex(0));
+        assertEquals("09",hex(9));
+        assertEquals("0A",hex(10));
+        assertEquals("0F",hex(15));
+        assertEquals("10",hex(16));
+        assertEquals("19",hex(25));
+        assertEquals("FF",hex(255));
     }
 
     public void testSha256() {
-        assertEquals("9F722959A023C02A3BA0FAFDBA81ADED642D6610EFF5DCA32DCE35132E16B6C5",Util.sha256("Dies ist ein Test"));
+        assertEquals("9F722959A023C02A3BA0FAFDBA81ADED642D6610EFF5DCA32DCE35132E16B6C5",sha256("Dies ist ein Test"));
     }
 
     public void testTranslate() {
@@ -35,30 +36,40 @@ public class UtilTest extends TestCase {
     }
 
     public void testIsEmail() {
-        assertFalse(Util.isEmail("Test"));
-        assertFalse(Util.isEmail("Test@"));
-        assertFalse(Util.isEmail("@Test"));
-        assertTrue(Util.isEmail("Test@Domain"));
-        assertFalse(Util.isEmail("Test@Domain@Test"));
+        assertFalse(isEmail("Test"));
+        assertFalse(isEmail("Test@"));
+        assertFalse(isEmail("@Test"));
+        assertTrue(isEmail("Test@Domain"));
+        assertFalse(isEmail("Test@Domain@Test"));
     }
 
     public void testSimplePassword() {
-        assertTrue(Util.simplePassword("$@%€#")); // too short
-        assertTrue(Util.simplePassword("test123")); // no special chars
-        assertFalse(Util.simplePassword("test$23")); // contains special chars
-        assertTrue(Util.simplePassword("skgjafdsg")); // chars only
-        assertTrue(Util.simplePassword("986535465")); // digits only
-        assertFalse(Util.simplePassword("test9523")); // mixed digits and chars
-        assertFalse(Util.simplePassword("8986546054")); // digits only, but long enough
-        assertFalse(Util.simplePassword("salgksdjbw")); // chars only, but long enough
+        assertTrue(simplePassword("$@%€#")); // too short
+        assertTrue(simplePassword("test123")); // no special chars
+        assertFalse(simplePassword("test$23")); // contains special chars
+        assertTrue(simplePassword("skgjafdsg")); // chars only
+        assertTrue(simplePassword("986535465")); // digits only
+        assertFalse(simplePassword("test9523")); // mixed digits and chars
+        assertFalse(simplePassword("8986546054")); // digits only, but long enough
+        assertFalse(simplePassword("salgksdjbw")); // chars only, but long enough
     }
 
     public void testUnsetFlags(){
-        assertEquals(0,Util.unset(31,1,2,4,8,16));
-        assertEquals(1,Util.unset(31,2,4,8,16));
-        assertEquals(2,Util.unset(31,1,4,8,16));
-        assertEquals(4,Util.unset(31,1,2,8,16));
-        assertEquals(8,Util.unset(31,1,2,4,16));
-        assertEquals(16,Util.unset(31,1,2,4,8));
+        assertEquals(0,unset(31,1,2,4,8,16));
+        assertEquals(1,unset(31,2,4,8,16));
+        assertEquals(2,unset(31,1,4,8,16));
+        assertEquals(4,unset(31,1,2,8,16));
+        assertEquals(8,unset(31,1,2,4,16));
+        assertEquals(16,unset(31,1,2,4,8));
+    }
+
+    public void testBoundedChar(){
+        assertEquals('0',boundedChar(0));
+        assertEquals('9',boundedChar(9));
+        assertEquals('A',boundedChar(10));
+        assertEquals('Z',boundedChar(35));
+        assertEquals('a',boundedChar(36));
+        assertEquals('z',boundedChar(61));
+        assertEquals('0',boundedChar(62));
     }
 }

src/test/java/de/srsoftware/widerhall/data/ListMemberTest.java

@@ -110,7 +110,7 @@ public class ListMemberTest extends TestCase {
     }*/
 
     public void testSafeMap() {
-        var user = new User("email","name","salt","hash",0);
+        var user = new User("email","name","salt","hash",null,0);
         var lm = new ListMember(null,user,ListMember.STATE_AWAITING_CONFIRMATION,"token");
         assertEquals(Map.of(EMAIL,"email",NAME,"name",STATE,"awaiting confirmation"),lm.safeMap());
     }
@@ -137,7 +137,7 @@ public class ListMemberTest extends TestCase {
     }*/
 
     public void testUser() {
-        var user = new User("email","name","salt","hash",0);
+        var user = new User("email","name","salt","hash",null,0);
         var lm = new ListMember(null,user,ListMember.STATE_AWAITING_CONFIRMATION,"token");
         assertEquals(user,lm.user());
     }

static/templates/login.st

@@ -19,5 +19,6 @@
                 <button type="submit">Login…</button>
             </fieldset>
         </form>
+        <a href="reset-pw«if(data.email)»?email=«data.email»«endif»">Forgot password?</a>
     </body>
 </html>

static/templates/new_password_form.st

@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+    «head()»
+    «userinfo()»
+
+    <body id="login">
+        «navigation()»
+        «messages()»
+        <h1>Set new account password</h1>
+        <form method="POST">
+            <fieldset>
+
+                Dear «if(data.user.name)»«data.user.name»«else»«data.user.email»«endif», you may now set a new password for your account «data.email»:
+                <legend>Login credentials</legend>
+                <label>
+                    <input enabled="false" value="«data.user.email»" />
+                    Email address
+                </label>
+                <label>
+                    <input type="password" name="password" value="" id="password" />
+                    Password
+                </label>
+                <label>
+                    <input type="password" name="password-repeat" value="" id="password-repeat" />
+                    Password (repeat)
+                </label>
+                <input type="hidden" name="token" value="«data.token»" />
+                <button type="submit">Save new password</button>
+            </fieldset>
+        </form>
+        <a href="reset-pw">Forgot password?</a>
+    </body>
+</html>

static/templates/reset-pw.st

@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html>
+    «head()»
+    <body id="login">
+        «navigation()»
+        «messages()»
+        <h1>Widerhall password recovery</h1>
+        <form method="POST">
+            <fieldset>
+                <legend>Forgot password?</legend>
+                If you have lost or forgot your password, please enter your email below.
+                Upon pressing the "Reset password" button, you will be sent an email with a link allowing you to set a new password.
+                <label>
+                    <input type="text" name="email" value="«data.email»" id="email" />
+                    Email address
+                </label>
+                <button type="submit">Reset password</button>
+            </fieldset>
+        </form>
+    </body>
+</html>

static/templates/reset_link_sent.st

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+    «head()»
+    <body id="login">
+        «navigation()»
+        «messages()»
+
+        <h1>Confirmation</h1>
+        <fieldset>
+            <legend>
+                Link sent
+            </legend>
+            An email was sent to you:<br/>
+            This mail contains a link, that proves you are in control about the resprective mail address. Open the received link in a web browser and you will be able to set a new password.
+        </fieldset>
+    </body>
+</html>

static/templates/subscribe.st

@@ -11,11 +11,11 @@
             <fieldset>
                 <legend>Suscribe to "«data.list»"</legend>
                 <label>
-                    <input type="text" name="name" value="«if(data.name)»«data.name»«else»«data.user.name»«endif»">
+                    <input type="text" name="name" value="«if(data.user)»«data.user.name»«else»«data.name»«endif»">
                     Name
                 </label>
                 <label>
-                    <input type="text" name="email" value="«if(data.email)»«data.email»«else»«data.user.email»«endif»">
+                    <input type="text" name="email" value="«if(data.user)»«data.user.email»«else»«data.email»«endif»">
                     Email
                 </label>
                 <label>