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asetkey(8)

NAME

   asetkey - Add a key from a keytab to an AFS KeyFile

SYNOPSIS

   asetkey add <kvno> <keyfile> <principal>

   asetkey add <kvno> <key>

   asetkey delete <kvno>

   asetkey list

DESCRIPTION

   The asetkey command is used to add a key to an AFS KeyFile from a
   Kerberos keytab.  It is similar to bos addkey except that it must be
   run locally on the system where the KeyFile is located and it takes the
   new key from the command line or a Kerberos 5 keytab rather than
   prompting for the password.

   asetkey delete can be used to delete a key (similar to bos removekeys),
   and asetkey list will list the keys in a KeyFile (similar to bos
   listkeys).

   asetkey is used when authentication for an AFS cell is provided by a
   Kerberos 5 KDC rather than kaserver.  The key for the "afs" or
   "afs/cell name" principal in the Kerberos 5 KDC must match the key
   stored in the AFS KeyFile on all AFS database servers and file servers.
   This is done by creating a keytab containing that key using the
   standard Kerberos commands (generally the "ktadd" function of the
   kadmin command) and then, on each AFS database server and file server,
   adding that key to the KeyFile with asetkey add.  The kvno chosen
   should match the kvno in the Kerberos KDC (checked with kvno or the
   "getprinc" function of kadmin).  principal should be the name of the
   AFS principal in the keytab, which must be either "afs" or "afs/cell
   name". asetkey can also be used to install a key from a hex string.

   In cells that use the Update Server to distribute the contents of the
   /etc/openafs/server directory, it is conventional to run asetkey add
   only on the control machine and then let the Update Server propagate
   the new KeyFile to all other systems.

CAUTIONS

   AFS currently only supports des-cbc-crc:v4 Kerberos keys.  Make sure,
   when creating the keytab with "ktadd", you pass "-e des-cbc-crc:v4" to
   force the encryption type.  Otherwise, AFS authentication may not work.

   As soon as a new keytab is created with "ktadd", new AFS service
   tickets will use the new key.  However, tokens formed from those
   service tickets will only work if the new key is present in the KeyFile
   on the AFS file server.  There is therefore an outage window between
   when the new keytab is created and when the key had been added to the
   KeyFile of all AFS servers with asetkey, during which newly obtained
   AFS tokens will not work properly.

   All of the KeyFile entries must match the key in the Kerberos KDC, but
   each time "ktadd" is run, it creates a new key.  Either the Update
   Server must be used to distribute the KeyFile to all servers or the
   same keytab must be used with asetkey on each server.

EXAMPLES

   The following commands create a new keytab for the principal "afs" and
   then import the key into the KeyFile.  Note the kvno in the output from
   "ktadd".

       % kadmin
       Authenticating as principal rra/[email protected] with password.
       Password for rra/[email protected]:
       kadmin:  ktadd -k /tmp/afs.keytab -e des-cbc-crc:v4 afs
       Entry for principal afs with kvno 3, encryption type DES cbc mode
       with CRC-32 added to keytab WRFILE:/tmp/afs.keytab.
       kadmin:  exit
       % asetkey add 3 /tmp/afs.keytab afs

   You may want to use "afs/cell name" instead of "afs", particularly if
   you may have multiple AFS cells for a single Kerberos realm.

   In the event you have been distributed a key by a Kerberos
   administrator in the form of a hex string, you may use asetkey to
   install that.

       % asetkey add 3 80b6a7cd7a9dadb6

   key should be an 8 byte hex representation.

PRIVILEGE REQUIRED

   The issuer must be able to read (for asetkey list) and write (for
   asetkey add and asetkey delete) the KeyFile, normally
   /etc/openafs/server/KeyFile.  In practice, this means that the issuer
   must be the local superuser "root" on the AFS file server or database
   server.  For asetkey add, the issuer must also be able to read the
   specified keytab file.

SEE ALSO

   KeyFile(5), bos_addkey(8), bos_listkeys(8), bos_removekey(8),
   kadmin(8), kvno(1)

COPYRIGHT

   Copyright 2006 Russ Allbery <[email protected]>

   This documentation is covered by the IBM Public License Version 1.0.
   This man page was written by Russ Allbery for OpenAFS.



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