|Note: Article about Proxmox VE 2.0 beta|
Proxmox VE supports multiple authentication sources, e.g. Microsoft Active Directory, LDAP, Linux PAM or the integrated Proxmox VE authentication server.
By using the role based user- and permission management for all objects (VM´s, storages, nodes, etc.) granular access can be defined.
Proxmox VE stores all user attributes in /etc/pve/users.cfg. So there must be an entry for each user in that file. The password is not stored, instead you can use the following methods to verify passwords.