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iDRAC 8/7 v2.30.30.30 User’s Guide

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Generating Kerberos keytab file

To support the SSO and smart card login authentication, iDRAC supports the configuration to enable itself as a kerberized service on a Windows Kerberos network. The Kerberos configuration on iDRAC involves the same steps as configuring a non–Windows Server Kerberos service as a security principal in Windows Server Active Directory.

The ktpass tool (available from Microsoft as part of the server installation CD/DVD) is used to create the Service Principal Name (SPN) bindings to a user account and export the trust information into a MIT–style Kerberos keytab file, which enables a trust relation between an external user or system and the Key Distribution Centre (KDC). The keytab file contains a cryptographic key, which is used to encrypt the information between the server and the KDC. The ktpass tool allows UNIX–based services that support Kerberos authentication to use the interoperability features provided by a Windows Server Kerberos KDC service. For more information on the ktpass utility, see the Microsoft website at: technet.microsoft.com/en-us/library/cc779157(WS.10).aspx

Before generating a keytab file, you must create an Active Directory user account for use with the -mapuser option of the ktpass command. Also, you must have the same name as iDRAC DNS name to which you upload the generated keytab file.

To generate a keytab file using the ktpass tool:

  1. Run the ktpass utility on the domain controller (Active Directory server) where you want to map iDRAC to a user account in Active Directory.
  2. Use the following ktpass command to create the Kerberos keytab file: 
    C:\> ktpass.exe -princ HTTP/idrac7name.domainname.com@DOMAINNAME.COM -mapuser DOMAINNAME\username -mapOp set -crypto AES256-SHA1
                                    -ptype KRB5_NT_PRINCIPAL -pass [password] -out c:\krbkeytab
    The encryption type is AES256-SHA1. The principal type is KRB5_NT_PRINCIPAL. The properties of the user account to which the Service Principal Name is mapped to must have Use AES 256 encryption types for this account property enabled.
    • NOTE: Use lowercase letters for the iDRACname and Service Principal Name. Use uppercase letters for the domain name as shown in the example.
  3. Run the following command: 
    C:\>setspn -a HTTP/iDRACname.domainname.com username
    A keytab file is generated.
    • NOTE: If you find any issues with iDRAC user for which the keytab file is created, create a new user and a new keytab file. If the same keytab file which was initially created is again executed, it does not configure correctly.

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