fix empty string where only username is available

MatrixConnection.php

@@ -14,6 +14,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+require_once(__DIR__ . "/helpers.php");
+
 class MatrixConnection {
 
     private $hs;
@@ -45,12 +48,8 @@ class MatrixConnection {
 
         $url = "https://" . $this->hs . "/_matrix/client/r0/rooms/"
                 . urlencode($room_id) . "/send/m.room.message?access_token=" . $this->at;
-        $handle = curl_init($url);
-        curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
-        curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+        $handle = getCurlHandle($url);
         curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($send_message));
-        curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
 
         $response = $this->exec_curl_request($handle);
         return isset($response["event_id"]);
@@ -70,40 +69,62 @@ class MatrixConnection {
         }
 
         $url = "https://" . $this->hs . "/_matrix/client/r0/profile/@" . $username . ":" . $this->hs;
-        $handle = curl_init($url);
-        curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
-        curl_setopt($handle, CURLOPT_TIMEOUT, 60);
-        curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+        $handle = getCurlHandle($url);
 
         $res = $this->exec_curl_request($handle);
         return !(isset($res["errcode"]) && $res["errcode"] == "M_UNKNOWN");
     }
 
+    function getRegisterNonce() {
+        $url = "https://" . $this->hs . "/_matrix/client/r0/admin/register";
+        $handle = getCurlHandle($url);
+
+        try {
+            $response = $this->exec_curl_request($handle);
+            if (is_array($response) && isset($response["nonce"])) {
+                return $response["nonce"];
+            }
+            throw new Exception("INVALID_RESPONSE_FROM_SERVER");
+        } catch (Exception $e) {
+            if (strcmp("AUTHENTICATION_FAILED", $e->getMessage()) == 0) {
+                throw new Exception("WRONG_REGISTRATION_SHARED_SECRET");
+            } else {
+                throw $e;
+            }
+        }
+    }
+
     function register($username, $password, $shared_secret) {
         if (!$username) {
             error_log("no username provided");
         }
         if (!$password) {
-            error_log("no message to send");
+            error_log("no password provided");
         }
-
-        $mac = hash_hmac('sha1', $username, $shared_secret);
+        $nonce = $this->getRegisterNonce();
+        //TODO allow registering of admin.
+        $hmac_content = $nonce . "\x00" . $username . "\x00" . $password . "\x00notadmin";
+        $mac = hash_hmac('sha1', $hmac_content, $shared_secret);
 
         $data = array(
+            "nonce" => $nonce,
             "username" => $username,
             "password" => $password,
             "mac" => $mac,
         );
-        $url = "https://" . $this->hs . "/_matrix/client/v2_alpha/register";
-        $handle = curl_init($url);
-        curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
-        curl_setopt($handle, CURLOPT_TIMEOUT, 60);
-        curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+        $url = "https://" . $this->hs . "/_matrix/client/r0/admin/register";
+        $handle = getCurlHandle($url);
         curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($data));
 
+        try {
             return $this->exec_curl_request($handle);
+        } catch (Exception $e) {
+            if (strcmp("AUTHENTICATION_FAILED", $e->getMessage()) == 0) {
+                throw new Exception("WRONG_REGISTRATION_SHARED_SECRET");
+            } else {
+                throw $e;
+            }
+        }
     }
 
     function exec_curl_request($handle) {
@@ -126,7 +147,7 @@ class MatrixConnection {
             $response = json_decode($response, true);
             error_log("Request has failed with error {$response['error']}\n");
             if ($http_code == 401) {
-                throw new Exception('Invalid access token provided');
+                throw new Exception("AUTHENTICATION_FAILED");
             }
         } else {
             $response = json_decode($response, true);
@@ -164,7 +185,6 @@ class MatrixMessage {
     function get_object() {
         return $this->message;
     }
-
 }
 
 ?>

README.md

@@ -23,6 +23,15 @@ When using `operationMode=local` you can have the following benefits (some requi
 - Use the 3PID lookup for other users (only email)
 - Search for users that you have not seen yet
 
+## Requirements
+
+- Working PHP environment with
+  - database connection provider \[one of sqlite, mysql, postgres\]
+  - curl extension to notify admins and register users (in `operationMode=synapse`)
+  - mail capability to interact with the users (Verification, Approval (+ initial password), Notifications)
+- matrix-synapse-rest-auth when using `operationMode=local`
+- some PHP capable webserver which makes the folder `public` accessible to the public and propably `internal` for server-internal access
+
 ## How to install
 
 - Copy `config.sample.php` to `config.php` and configure the bot as you can find there
@@ -43,9 +52,11 @@ When using `operationMode=local` you can have the following benefits (some requi
 
 ## Further notes:
 
-### This bot sends mails
-To allow the bot to verify the email address of the user and to interact with them e.g. in case of approval this bot needs a running mailserver configuration.
-This bot relies on php to be properly configured.
+### Security: Passwords from registration form are stored in clear text
+Currently the passwords which are typed in while capturing the register request are stored in clear text.
+The bot needs to access them to trigger a register request with correct credentials.
+It is currently strongly recommended to set `"getPasswordOnRegistration" => false` in your config!
+This leads to autocreating passwords which will then be send to the users directly without storing it.
 
 ### Use the ChangePasswortInterceptor (if `operationMode=local`)
 

cron.php

@@ -19,7 +19,9 @@ require_once(__DIR__ . "/language.php");
 require_once(__DIR__ . "/mail_templates.php");
 require_once(__DIR__ . "/database.php");
 
-$sql = "SELECT id, first_name, last_name, username, email, state, note, verify_token, admin_token FROM registrations "
+$sql = "SELECT id, first_name, last_name, username, password, email,"
+        . " state, note, verify_token, admin_token "
+        . "FROM registrations "
         . "WHERE state = " . RegisterState::PendingEmailSend
         . " OR state = " . RegisterState::PendingAdminSend
         . " OR state = " . RegisterState::PendingRegistration
@@ -87,7 +89,7 @@ foreach ($mx_db->query($sql) as $row) {
                         break;
                     case "local":
                         // register by adding a user to the local database
-                        $password = $mx_db->addUser($row["first_name"], $row["last_name"], $row["username"], $row["email"]);
+                        $password = $mx_db->addUser($row["first_name"], $row["last_name"], $row["username"], $row["password"], $row["email"]);
                         break;
                     default:
                         throw new Exception("Unknown operationMode");

database.php

@@ -78,7 +78,7 @@ class mxDatabase {
 			first_name TEXT,
 			last_name TEXT,
 			username TEXT,
-			password_hash TEXT DEFAULT '',
+			password TEXT DEFAULT '',
 			note TEXT,
 			email TEXT,
 			verify_token TEXT,
@@ -98,7 +98,7 @@ class mxDatabase {
 			)");
         // make sure the bot is allowed to login
         if (!$this->userRegistered("register_bot")) {
-            $password = $this->addUser("Register", "Bot", "register_bot", $config["register_email"]);
+            $password = $this->addUser("Register", "Bot", "register_bot", NULL, $config["register_email"]);
             $config["register_password"] = $password;
             $myfile = fopen(dirname(__FILE__) . "/config.json", "w");
             fwrite($myfile, json_encode($config, JSON_PRETTY_PRINT));
@@ -184,7 +184,7 @@ class mxDatabase {
      *
      * @return ["verify_token"]
      */
-    function addRegistration($first_name, $last_name, $username, $note, $email) {
+    function addRegistration($first_name, $last_name, $username, $password, $note, $email) {
         if ($this->userPendingRegistrations($username)) {
             throw new Exception("USERNAME_PENDING_REGISTRATION");
         }
@@ -196,8 +196,9 @@ class mxDatabase {
         $admin_token = bin2hex(random_bytes(16));
 
         $this->db->exec("INSERT INTO registrations
-			(first_name, last_name, username, note, email, verify_token, admin_token)
-			VALUES ('" . $first_name . "','" . $last_name . "','" . $username . "','" . $note . "','"
+                (first_name, last_name, username, password, note, email, verify_token, admin_token)
+		VALUES ('" . $first_name . "','" . $last_name . "','"
+                . $username . "','" . $password . "','" . $note . "','"
                 . $email . "','" . $verify_token . "','" . $admin_token . "')");
 
         return [
@@ -217,7 +218,7 @@ class mxDatabase {
         $res = $this->db->query($sql);
 
         if ($res->fetchColumn() > 0) {
-            $sql = "SELECT first_name, last_name, username, note, email FROM registrations"
+            $sql = "SELECT first_name, last_name, username, password, note, email FROM registrations"
                     . " WHERE admin_token = '" . $admin_token . "'"
                     . " AND state = " . RegisterState::PendingAdminVerify
                     . " LIMIT 1;";
@@ -282,14 +283,16 @@ class mxDatabase {
      * 			NULL when failed
      *
      */
-    function addUser($first_name, $last_name, $username, $email) {
+    function addUser($first_name, $last_name, $username, $password, $email) {
         // check if user already exists and abort in that case
         if ($this->userRegistered($username)) {
             return NULL;
         }
 
+        if ($password == NULL) {
             // generate a password with 10 characters
             $password = bin2hex(openssl_random_pseudo_bytes(5));
+        }
         $password_hash = password_hash($password, PASSWORD_BCRYPT, ["cost" => 12]);
 
         $sql = "INSERT INTO logins (first_name, last_name, localpart, password_hash, email) VALUES "

helpers.php

@@ -30,4 +30,13 @@ function stripLocalpart($mxid) {
     return $localpart;
 }
 
+function getCurlHandle($url) {
+    $handle = curl_init($url);
+    curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
+    curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
+    curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+    curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+    return $handle;
+}
+
 ?>

lang/lang.de-de.php

@@ -31,10 +31,13 @@ $language = array(
     "UNKNOWN_SESSION" => "Sitzungstoken nicht vorhanden oder ungültig.",
     "UNKNOWN_USERNAME" => "Nutzername fehlt",
     "UNKNOWN_TOKEN" => "Token ist unbekannt",
+    "AUTHENTICATION_FAILED" => "Authentifizierung fehlgeschlagen",
+    "WRONG_REGISTRATION_SHARED_SECRET" => "registration_shared_secret fehlerhaft",
     "USERNAME_INVALID" => "Nutzername muss aus 3 bis 20 Kleinbuchstaben bestehen",
     "USERNAME_NOT_ALNUM" => "Nutzername ist nicht alphanumerisch",
     "USERNAME_PENDING_REGISTRATION" => "Dieser Nutzername wurde bereits zur Registrierung vorgemerkt. Versuche es später noch einmal oder wähle einen anderen Nutzernamen",
     "USERNAME_REGISTERED" => "Dieser Nutzername wurde bereits registriert. Bitte wähle einen anderen Nutzernamen",
+    "PASSWORD_NOT_PROVIDED" => "Ein oder beide Passwörter wurden nicht gesetzt",
     "PASSWORD_NOT_MATCH" => "Passwörter stimmen nicht überein",
     "NOTE_LENGTH_EXEEDED" => "Notiz ist länger als die erlaubten 50 Zeichen",
     "PLACEHOLDER_NOTE_ABOUT_YOURSELF" => "Notiz zu dir (max. 50 Zeichen)",

lang/lang.en-gb.php

@@ -31,10 +31,13 @@ $language = array(
     "UNKNOWN_SESSION" => "Session token not found of invalid.",
     "UNKNOWN_USERNAME" => "username unknown",
     "UNKNOWN_TOKEN" => "Token is unknown",
+    "AUTHENTICATION_FAILED" => "Authentication failed",
+    "WRONG_REGISTRATION_SHARED_SECRET" => "wrong registration_shared_secret",
     "USERNAME_INVALID" => "Username has to consist of 3 to 20 small letters",
     "USERNAME_NOT_ALNUM" => "Username is not alphanumeric",
     "USERNAME_PENDING_REGISTRATION" => "This username is locked for registration. Try again later or try again with a different username",
     "USERNAME_REGISTERED" => "This username is already registered. Please try again with another username",
+    "PASSWORD_NOT_PROVIDED" => "One or both passwords are not provided",
     "PASSWORD_NOT_MATCH" => "passwords do not match",
     "NOTE_LENGTH_EXEEDED" => "Note consists of more than 50 characters",
     "PLACEHOLDER_NOTE_ABOUT_YOURSELF" => "Note about yourself (max. 50 characters)",

lang/mail.de-de.php

@@ -79,7 +79,7 @@ Deine Registrierungsanfrage wurde durch die Administratoren bestätigt.
 
 Zum Anmelden kannst du folgende Zugangsdaten verwenden:
 Nutzername: $username
-Passwort: $password
+Passwort: " . (empty($password) ? "wie selbst gesetzt": $password) . "
 
 Hinweis: Das Passwort kannst du aktuell über die App selbst ändern. Auch wenn das Passwort nirgends
 im Klartext gespeichert wird, kann jemand Zugriff auf diese Mail erlangen und so den Zugriff bekommen.

lang/mail.en-gb.php

@@ -78,7 +78,7 @@ Your registration request got verified by the admin team.
 
 To log in you can use the following credentials::
 Username: $username
-Password: $password
+Passwort: " . (empty($password) ? "as self-set": $password) . "
 
 Important: Please change your password as soon as possible after your first login.
 The password is not stored in clear text on the server but people could get access to this mail

public/index.php

@@ -20,7 +20,7 @@ if (!isset($_SERVER['HTTPS'])) {
 }
 
 require_once(__DIR__ . "/../language.php");
-if (!file_exists("../config.php")) {
+if (!file_exists(__DIR__ . "/../config.php")) {
     print($language["NO_CONFIGURATION"]);
     exit();
 }
@@ -57,8 +57,10 @@ if ($_SERVER["REQUEST_METHOD"] == "POST") {
         if (ctype_alnum($_POST['username']) != true) {
             throw new Exception("USERNAME_NOT_ALNUM");
         }
-        if (isset($config["getPasswordOnRegistration"]) && $config["getPasswordOnRegistration"] &&
-                $_POST["password"] != $_POST["password_confirm"]) {
+        if ($storePassword && (!isset($_POST["password"]) || !isset($_POST["password_confirm"]))) {
+                throw new Exception("PASSWORD_NOT_PROVIDED");
+        }
+        if ($storePassword && $_POST["password"] != $_POST["password_confirm"]) {
             throw new Exception("PASSWORD_NOT_MATCH");
         }
         if (isset($_POST["note"]) && strlen($_POST["note"]) > 50) {
@@ -82,6 +84,7 @@ if ($_SERVER["REQUEST_METHOD"] == "POST") {
         }
 
         $username = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
+        $password = "";
         if ($storePassword && isset($_POST["password"])) {
             $password = filter_var($_POST["password"], FILTER_SANITIZE_STRING);
         }
@@ -89,7 +92,7 @@ if ($_SERVER["REQUEST_METHOD"] == "POST") {
         $email = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
 
         require_once(__DIR__ . "/../database.php");
-        $res = $mx_db->addRegistration($first_name, $last_name, $username, $note, $email);
+        $res = $mx_db->addRegistration($first_name, $last_name, $username, $password, $note, $email);
 
         if (!isset($res["verify_token"])) {
             error_log("sth. went wrong. registration did not throw but admin_token not set");

public/verify.php

@@ -51,18 +51,21 @@ try {
     $email = $user["email"];
     $admin_token = $user["admin_token"];
 
+    // we have 2 cases: first and last name or just the username
+    $call_name = strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username;
+
     require_once(__DIR__ . "/../MatrixConnection.php");
     $adminUrl = $config["webroot"] . "/verify_admin.php?t=" . $admin_token;
     $mxConn = new MatrixConnection($config["homeserver"], $config["access_token"]);
     $mxMsg = new MatrixMessage();
     $mxMsg->set_body(strtr($language["MSG_USER_WANTS_REGISTER"], [
-        "@name" => (strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username),
+        "@name" => $call_name,
         "@note" => $note,
         "@adminUrl" => $adminUrl
     ]));
     if (isset($language["MSG_USER_WANTS_REGISTER_FORMATTED"])) {
         $mxMsg->set_formatted_body(strtr($language["MSG_USER_WANTS_REGISTER_FORMATTED"], [
-            "@name" => (strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username),
+            "@name" => $call_name,
             "@note" => $note,
             "@adminUrl" => $adminUrl
         ]));
@@ -76,7 +79,7 @@ try {
     $mx_db->setRegistrationStateVerify(
             ($response ? RegisterState::PendingAdminVerify : RegisterState::PendingAdminSend), $token);
 
-    send_mail_pending_approval($config["homeserver"], $first_name . " " . $last_name, $email);
+    send_mail_pending_approval($config["homeserver"], $call_name, $email);
 
     print("<title>" . $language["VERIFICATION_SUCEEDED"] . "</title>");
     print("</head><body>");

public/verify_admin.php

@@ -60,6 +60,9 @@ try {
     $first_name = $user["first_name"];
     $last_name = $user["last_name"];
     $username = $user["username"];
+    // we have 2 cases: first and last name or just the username
+    $call_name = strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username;
+
     $note = $user["note"];
     $email = $user["email"];
 
@@ -71,11 +74,17 @@ try {
         $mxConn = new MatrixConnection($config["homeserver"], $config["access_token"]);
 
         $password = NULL;
+        $use_db_password = (isset($config["getPasswordOnRegistration"]) && $config["getPasswordOnRegistration"]);
+        if ($use_db_password && isset($user["password"]) && strlen($user["password"]) > 0) {
+            $password = $user["password"];
+        } else {
+            $use_db_password = false;
+            // generate a password with 10 characters
+            $password = bin2hex(openssl_random_pseudo_bytes(5));
+        }
         switch ($config["operationMode"]) {
             case "synapse":
                 // register with registration_shared_secret
-                // generate a password with 10 characters
-                $password = bin2hex(openssl_random_pseudo_bytes(5));
                 $res = $mxConn->register($username, $password, $config["registration_shared_secret"]);
                 if (!$res) {
                     // something went wrong while registering
@@ -84,7 +93,7 @@ try {
                 break;
             case "local":
                 // register by adding a user to the local database
-                $password = $mx_db->addUser($first_name, $last_name, $username, $email);
+                $password = $mx_db->addUser($first_name, $last_name, $username, $password, $email);
                 break;
             default:
                 throw new Exception("Unknown operationMode");
@@ -92,7 +101,13 @@ try {
         if ($password != NULL) {
             // send registration_success
             $res = send_mail_registration_success(
-                    $config["homeserver"], $first_name . " " . $last_name, $email, $username, $password, $config["howToURL"]
+                    $config["homeserver"],
+                    $call_name,
+                    $email,
+                    $username,
+                    // only send password when auto-created
+                    ($use_db_password ? NULL : $password),
+                    $config["howToURL"]
             );
             if ($res) {
                 $mx_db->setRegistrationStateAdmin(RegisterState::AllDone, $token);
@@ -100,11 +115,11 @@ try {
                 $mx_db->setRegistrationStateAdmin(RegisterState::PendingSendRegistrationMail, $token);
             }
         } else {
-            send_mail_registration_allowed_but_failed($config["homeserver"], $first_name . " " . $last_name, $email);
+            send_mail_registration_allowed_but_failed($config["homeserver"], $call_name, $email);
             $mxMsg = new MatrixMessage();
             $mxMsg->set_type("m.text");
             $mxMsg->set_body(strtr($language["REGISTRATION_FAILED_FOR"], [
-                "@name" => strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username,
+                "@name" => $call_name,
             ]));
             $mxConn->send($config["register_room"], $mxMsg);
             throw new Exception("REGISTRATION_FAILED");
@@ -117,7 +132,7 @@ try {
     } elseif ($action == RegisterState::RegistrationDeclined) {
         $mx_db->setRegistrationStateAdmin(RegisterState::RegistrationDeclined, $token);
         send_mail_registration_decline(
-                $config["homeserver"], strlen($first_name . $last_name) > 0 ? $first_name . " " . $last_name : $username, $email, $decline_reason
+                $config["homeserver"], $call_name, $email, $decline_reason
         );
         print("<title>" . $language["ADMIN_VERIFY_SITE_TITLE"] . "</title>");
         print("</head><body>");