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4. KRB_TGS_REP: TIcketclient, service: service, E((client, adress, validity, keyclient, service), keyservice)
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5. KRB_AP_REQ: Ticketclient, service: service, E((client, address, validity, keyclient, service), keyservice) Authenticator: E((client, timestamp), Keyclient, service) File Server
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Figure 2-12 This exchange occurs when a computer starts and requests a file from a file server.
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The exchange in Figure 2-12 consists of the following parts: 1. After the computer starts it creates some preauthentication data, consisting of, among other things, a time stamp. This preauthentication data is encrypted using a key derived from the computer s password. It is then packaged in a KRB_AS_REQ (Kerberos Authentication Service Request) packet and sent to the Authentication Service (AS) which resides on the Key Distribution Center (KDC), which, as it turns out, is the DC. 2. The AS constructs a Ticket Granting Ticket (TGT) and creates a session key that the client can use to communicate with the Ticket Granting Service (TGS), which also resides on the DC in Windows. This key is denoted with Keyclient,TGS in Figure 2-12. It is transmitted to the client encrypted with the client s own public key. This message is sent back as the KRB_AS_REP.
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3. The client now sends a KRB_TGS_REQ message to the Ticket Granting Service (TGS) on the KDC to request a ticket for the file server. This request has the TGT in it, and also includes the service the client wants to access and information on the client encrypted with the TGS public key. The KRB_TGS_REQ includes an authenticator, which is essentially a time stamp encrypted with the session key the client shares with the TGS. 4. The TGS responds with a KRB_TGS_REP message that includes a ticket for the service the client requested. It contains the same information the client sent in the KRB_TGS_REQ, but this time is encrypted using the server s public key. In other words, the client cannot read this data. The TGS also creates a session key that the client can share with the server and encrypts it with the session key the client shares with the TGS. 5. Finally, the client sends its ticket for the service to the server, in a KRB_AP_REQ message. The client information, along with the client-server session key, is encrypted using the server s public key, and the message also includes the client s authenticator, which is encrypted using the shared session key. When a user logs on to the client, the same process is repeated, but this time the messages include user information. The Kerberos client sends another KRB_AS_REQ, but encrypts the preauthentication data with a key derived from the client s password or rather, the client s NT hash. The KDC validates the authentication based on that information. In the KRB_AS_REP the client receives a TGT that the user can use to contact the TGS. The TGT includes session keys for the KDC along with Security Identifiers (SIDs) for the user and all the groups the user is a member of. From then on, the client will use the user s TGT for requests made on behalf of the user. Kerberos is clearly a rather complicated protocol, but it has proven remarkably robust in Windows. It also proves to be extensible in that the user s preauthentication data can just as easily be encrypted with some secret not derived from a password. This happens in smart card based authentication, which I will discuss next.
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A smart card is, in most cases, a credit card sized device that contains a memory chip. These devices have many uses. For example, they are used to provision a phone s identity in the Global System for Mobile (GSM) communications cellular telephone system and its derivatives. Smart cards may also be used to authenticate to Windows. In that case they contain an X.509 certificate. (See 10 for more information about certificates.) The certificate contains a private key, and the corresponding public key is stored in the user object in Active Directory. When the user authenticates using a smart card, WinLogon will ask for a PIN code instead of a password. It then contacts the smart card provider and provides it with the PIN code along with the preauthentication data. The smart card provider uses the PIN code to access the
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Part I:
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