Honor remember_login_cookie_lifetime

If the remember_login_cookie_lifetime is set to 0 this means we do not
want to use remember me at all. In that case we should also not creatae
a remember me cookie and should create a proper temp token.

Further this specifies that is not 0 the remember me time should always
be larger than the session timeout. Because else the behavior is not
really defined.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

config/config.sample.php

@@ -225,8 +225,8 @@
 'allow_user_to_change_display_name' => true,
 
 /**
- * Lifetime of the remember login cookie, which is set when the user clicks
- * the ``remember`` checkbox on the login screen.
+ * Lifetime of the remember login cookie. This should be larger than the
+ * session_lifetime. If it is set to 0 remember me is disabled.
  *
  * Defaults to ``60*60*24*15`` seconds (15 days)
  */

core/Controller/LoginController.php

@@ -329,7 +329,14 @@ public function tryLogin($user, $password, $redirect_url, $remember_login = true
 		// TODO: remove password checks from above and let the user session handle failures
 		// requires https://github.com/owncloud/core/pull/24616
 		$this->userSession->completeLogin($loginResult, ['loginName' => $user, 'password' => $password]);
-		$this->userSession->createSessionToken($this->request, $loginResult->getUID(), $user, $password, IToken::REMEMBER);
+
+		$tokenType = IToken::REMEMBER;
+		if ((int)$this->config->getSystemValue('remember_login_cookie_lifetime', 60*60*24*15) === 0) {
+			$remember_login = false;
+			$tokenType = IToken::DO_NOT_REMEMBER;
+		}
+
+		$this->userSession->createSessionToken($this->request, $loginResult->getUID(), $user, $password, $tokenType);
 		$this->userSession->updateTokens($loginResult->getUID(), $password);
 
 		// User has successfully logged in, now remove the password reset link, when it is available