TYPO3 Core

I use the FE_SESSION_KEY to use one login with different (out of Browser) applications. Since typo3 version 6.2 I could still login but there is no session Cookie set.

The property
AbstractUserAuthentication::dontSetCookie
is confusing me. If it is FALSE it works. if it is TRUE it doesn't. Unfortunatly it is set in
FrontendUserAuthentication::__construct()
to TRUE with the following Comment:

// Disable cookie by default, will be activated if saveSessionData() is called,
// a user is logging-in or an existing session is found

Unfortunatly it is NEVER activated!
And AbstractUserAuthentication::forceSetCookie has no effect!
And saveSessionData() does not exists!

Here is my workaround in TypoScriptFrontendController (of course there are many ways to fix it):

public function initFEuser() {
  // ...
  if (GeneralUtility::_GP('FE_SESSION_KEY')) {
  // ...
    if (md5(($fe_sParts[0] . '/' . $this->TYPO3_CONF_VARS['SYS']['encryptionKey'])) === (string)$fe_sParts[1]) {
    // ...
      $this->fe_user->forceSetCookie = 1;
      $this->fe_user->dontSetCookie = FALSE; // THIS IS MY FIX