Infinite redirection loop with user_ldap

[zeronounours]

With ownCloud 8.1.1 and user_cas 1.1.
When user_cas is configured with Link to LDAP backend on and Autocreate user off, the user is redirected to the default page endlessly while trying to log in.

The issue comes from user_ldap not being loaded before user_cas. This causes shouldEnforceAuthentication function to always be evaluated as true even when the user has been logged in. When this function actually calls OCP\User::isLoggedIn(), the LDAP backend isn't registered yet and so isn't checked for user existence.

A quick workaround is to load all authentication applications when initializing CAS backend:

class OC_USER_CAS extends OC_User_Backend {
    public function __construct() {
        $this->autocreate = OCP\Config::getAppValue('user_cas', 'cas_autocreate', true);
        $this->cas_link_to_ldap_backend = \OCP\Config::getAppValue('user_cas', 'cas_link_to_ldap_backend', false);
        $this->updateUserData = OCP\Config::getAppValue('user_cas', 'cas_update_user_data', true);
        $this->defaultGroup = OCP\Config::getAppValue('user_cas', 'cas_default_group', '');
        $this->protectedGroups = explode (',', str_replace(' ', '', OCP\Config::getAppValue('user_cas', 'cas_protected_groups', '')));
        $this->mailMapping = OCP\Config::getAppValue('user_cas', 'cas_email_mapping', '');
        $this->displayNameMapping = OCP\Config::getAppValue('user_cas', 'cas_displayName_mapping', '');
        $this->groupMapping = OCP\Config::getAppValue('user_cas', 'cas_group_mapping', '');
        self :: initialized_php_cas();
        OC_App::loadApps(['authentication']);
    }
}

[DamienGombaultRecia]

I confirm this bug.
zeronounours, thank you for the workaround.

[tinylcy]

@zeronounours
Thanks for your precious workaround！

[bastienho]

👍
Thank you @zeronounours the patch works like a charm !

[cedlerouge]

I confirm this bug too, and this workaround fix it but i have a strange behaviour :
cas_force_login is off
cas_link_to_ldap_backend on
but owncloud don't let me authenticate via owncloud form.
this is usefull for public shared link

EDIT: this behavior is not related with the workaround. workaround is ok.

[nitmir]

I confirm too. The workaround works for me too.