The role of the Kerberos server is to authenticate a user on a network, and not to validate whether such and such user has access rights to the resource.Īs an example, you may ask for a ticket to an accounting server that you have no right to access, the Kerberos server will give you the ticket. The file server validates that the user has the proper rights to access the resource, and then choses to authorize or prevent the user from accessing the resource. The file server validâtes that the ticket has been generated by the Kerberos server that it trusts, and thus the file server authenticates the user. The client workstation connects to the file server using the newly obtained ST. If it finds a corresponding entry, it assembles a ST for the corresponding Kerberos account and sends it back to the user. The Kerberos server looks up in its LDAP an entry that has a servicePrincipalName whose name matches the requested value. The Windows client will ask the Kerberos server a ST for the SPN that matches the string of characters HOST/. The user wants to connect to the file server. In practice, the TGT is renewed every day when the user opens up her session. One trades a long-lived password (your password that is changed every 3 months for example), with a short-lived password (the TGT may be renewed several times a day). In a way, this method removes the need to ask again the user to provide her password. One can see the TGT as a temporary password used by the workstation for asking other tickets. Once the Kerberos server has authenticated the user, it provides her with a TGT. It is a challenge authentication based on symetric cryptography (the server asks the workstation to encrypt a message that contains somes informations, notably the timestamp) Upon opening a session, the user authenticate herself with the Kerberos server using her password. On the left, we have a Windows Workstation: It is however a summary that voluntarily forgets some details to facilitate understanding however the diagram contains the necessary details to debug Kerberos problems in your Active Directory environment. Simplifying a little, we can summarize how Kerberos works with the Following diagram. The server that provides the Kerberos service. So, we’ll allow indifferently the use of AD, DC, Domain Controller, KDC or Kerberos server to designate Contact Tranquil IT for your Samba-AD projectĪn Active Directory server integrates a Kerberos server that is also called a KDC.Transferring your Samba3-NT4 to a new host.Common mistakes with Samba-AD, tips and tricks.Synchronizing SYSVOLs between multiple domain controllers.Joining members to the Active Directory domain.Advanced features of Samba Active Directory.Installing and configuring a Samba-AD server.Dimensioning a Samba Active Directory server.Working with replicated Active Directory.About the services that compose a Samba Active Directory server.
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