ldap authentification error with duplicate mail

[edrobal]

Steps to reproduce the issue

2 ldap entries have different cn and password but same mail

Expected result

The second user must be able to connect with its username/password

Actual result

when connecting (first time), second cannot connect

System information (as much as possible)

PHP exécuté sur Linux h2web38 4.9.0-0.bpo.9-amd64 #1 SMP Debian 4.9.168-1+deb9u2~deb8u1 (2019-05-14) x86_64
Type de la base de données mysql
Version de la base de données 5.6.33-log
Interclassement de la base de données utf8_general_ci
Collation de la connexion à la base de données utf8mb4_general_ci
Version de PHP 7.3.5
Serveur web Apache
Serveur web pour interface PHP fpm-fcgi
Version de Joomla Joomla! 3.9.8 Stable [ Amani ] 11-June-2019 20:00 GMT
Version de la plateforme Joomla! Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT

Additional comments

[ghost]

@HLeithner can you please comment?

[alikon]

maybe related to #25191

[ghost]

but this Issue is for J3.

[richard67]

Not related.

[HLeithner]

iirc joomla writes an entry to the user table on ldap login and joomla needs an unique e-mail address per user. So I think we can't do much against this.

[edrobal]

It's crazy but no choice. And this mail address is usefulness for joomla. User not registered in ldap cannot connect in private area.