8
ticket granting ticket
9
key distribution center
10
key table
11
server table
Kerberos Operation
A Kerberos server can be a switch that is configured as a network security server and that can authenticate
remote users by using the Kerberos protocol. Although you can customize Kerberos in a number of ways,
remote users attempting to access network services must pass through three layers of security before they can
access network services.
Kerberos Operation
A Kerberos server can be a switch that is configured as a network security server and that can authenticate
remote users by using the Kerberos protocol. Although you can customize Kerberos in a number of ways,
remote users attempting to access network services must pass through three layers of security before they can
access network services.
To authenticate to network services by using a switch as a Kerberos server, remote users must follow these
steps:
Authenticating to a Boundary Switch
This section describes the first layer of security through which a remote user must pass. The user must first
authenticate to the boundary switch. This process then occurs:
1
The user opens an un-Kerberized Telnet connection to the boundary switch.
2
The switch prompts the user for a username and password.
3
The switch requests a TGT from the KDC for this user.
4
The KDC sends an encrypted TGT that includes the user identity to the switch.
5
The switch attempts to decrypt the TGT by using the password that the user entered.
•
If the decryption is successful, the user is authenticated to the switch.
•
If the decryption is not successful, the user repeats Step 2 either by re-entering the username and
password (noting if Caps Lock or Num Lock is on or off) or by entering a different username and
password.
A remote user who initiates a un-Kerberized Telnet session and authenticates to a boundary switch is inside
the firewall, but the user must still authenticate directly to the KDC before getting access to the network
services. The user must authenticate to the KDC because the TGT that the KDC issues is stored on the switch
and cannot be used for additional authentication until the user logs on to the switch.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
983
Information About Kerberos
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