Remove automatic to-lowercase conversion of usernames (#1488715)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Remove automatic to-lowercase conversion of usernames (#1488715)
 - Fix scrolling quirk in email preview frame using Opera 12 (#1488763)
 - Fix displaying of multipart/alternative messages with empty parts (#1488750)
 - Fix threaded list sorting on PHP < 5.2.9 (#1488748)

config/main.inc.php.dist

@@ -226,10 +226,10 @@ $rcmail_config['login_autocomplete'] = 0;
 
 // Forces conversion of logins to lower case.
 // 0 - disabled, 1 - only domain part, 2 - domain and local part.
-// If users authentication is not case-sensitive this must be enabled.
-// After enabling it all user records need to be updated, e.g. with query:
+// If users authentication is case-insensitive this must be enabled.
+// Note: After enabling it all user records need to be updated, e.g. with query:
 //       UPDATE users SET username = LOWER(username);
-$rcmail_config['login_lc'] = 0;
+$rcmail_config['login_lc'] = 2;
 
 // Includes should be interpreted as PHP files
 $rcmail_config['skin_include_php'] = false;

program/include/rcmail.php

@@ -452,6 +452,10 @@ class rcmail extends rcube
         $username .= '@'.rcube_utils::parse_host($config['username_domain'], $host);
     }
 
+    if (!isset($config['login_lc'])) {
+      $config['login_lc'] = 2; // default
+    }
+
     // Convert username to lowercase. If storage backend
     // is case-insensitive we need to store always the same username (#1487113)
     if ($config['login_lc']) {
@@ -483,21 +487,7 @@ class rcmail extends rcube
     $storage = $this->get_storage();
 
     // try to log in
-    if (!($login = $storage->connect($host, $username, $pass, $port, $ssl))) {
-      // try with lowercase
-      $username_lc = mb_strtolower($username);
-      if ($username_lc != $username) {
-        // try to find user record again -> overwrite username
-        if (!$user && ($user = rcube_user::query($username_lc, $host)))
-          $username_lc = $user->data['username'];
-
-        if ($login = $storage->connect($host, $username_lc, $pass, $port, $ssl))
-          $username = $username_lc;
-      }
-    }
-
-    // exit if login failed
-    if (!$login) {
+    if (!$storage->connect($host, $username, $pass, $port, $ssl)) {
       return false;
     }