NAME

       KeyFileExt - Defines extended AFS server encryption keys

DESCRIPTION

       The KeyFileExt file defines some of the server encryption keys that the AFS server
       processes running on the machine use to decrypt the tickets presented by clients during
       the mutual authentication process. AFS server processes perform privileged actions only
       for clients that possess a ticket encrypted with one of the keys from the KeyFile or
       KeyFileExt.  The file must reside in the /etc/openafs/server directory on every server
       machine. For more detailed information on mutual authentication and server encryption
       keys, see the OpenAFS Administration Guide.

       Each key has a corresponding key version number and encryption type that distinguishes it
       from the other keys. The tickets that clients present are also marked with a key version
       number and encryption type to tell the server process which key to use to decrypt it. The
       KeyFileExt file must always include a key with the same key version number and encryption
       type and contents as the key currently listed for the "afs/cell" principal in the
       associated Kerberos v5 realm.  (The principal "afs" may be used if the cell and realm
       names are the same, but adding the cell name to the principal is recommended even in this
       case.)  Keys in the KeyFile must be DES keys; keys of stronger encryption types (such as
       those used by the rxkad-k5 extension) are contained in the KeyFileExt.

       The KeyFileExt file is in binary format, so always use the asetkey command to administer
       it:

       •   The asetkey add command to add a new key.

       •   The asetkey list command to display the keys.

       •   The asetkey delete command to remove a key from the file.

       The asetkey commands must be run on the same server as the KeyFileExt file to update.
       Normally, new keys should be added from a Kerberos v5 keytab using asetkey add.

       The file should be edited on each server machine.

CAUTIONS

       The most common error caused by changes to KeyFileExt is to add a key that does not match
       the corresponding key for the Kerberos v5 principal or Authentication Server database
       entry. Both the key and the key version number must match the key for the corresponding
       principal, either "afs/cell" or "afs", in the Kerberos v5 realm.  Using asetkey(8) to add
       rxkad-k5 keys to the KeyFileExt also requires specifying a krb5 encryption type number.
       Since the encryption type must be specified by its number (not a symbolic or string name),
       care must be taken to determine the correct encryption type to add.

SEE ALSO

       KeyFile(5), asetkey(8),

       The OpenAFS Administration Guide at <http://docs.openafs.org/AdminGuide/>.

COPYRIGHT

       IBM Corporation, 2000. <http://www.ibm.com/> All Rights Reserved.  Massachusetts Institute
       of Technology, 2015.