NAME

       akeyconvert - Import keys from rxkad.keytab to an AFS KeyFileExt

SYNOPSIS

       akeyconvert -all

DESCRIPTION

       The akeyconvert command is used when upgrading an AFS cell from the 1.6.x release series
       to the 1.8.x release series.  When using the rxkad-k5 security extension, the 1.6.x
       release series stored the AFS long-term Kerberos keys in a krb5 keytab file named
       rxkad.keytab.  The 1.8.x series releases avoid widespread linking against libkrb5, and
       instead store the AFS long-term Kerberos keys in an OpenAFS-specific file format, the
       KeyFileExt(5).

       akeyconvert provides an easy way to convert the AFS long-term Kerberos keys from the krb5
       keytab format to the KeyFileExt format.  The same functionality is possible via repeated
       use of asetkey(8), but akeyconvert is provided to simplify the process.

       By default, akeyconvert will only migrate the newest key (highest kvno) for each Kerberos
       principal with a key in the rxkad.keytab.  The ability to convert all keys, regardless of
       kvno, is provided as akeyconvert -all.

CAUTIONS

       The KeyFileExt format is slightly less flexible than the krb5 keytab format -- the
       KeyFileExt identifies keys only by the type (rxkad-k5), kvno, and enctype ("subtype"),
       whereas the krb5 keytab also stores the principal name associated with each key.  This
       means that a krb5 keytab which contained keys of identical kvno and enctype, but for
       different principals, would not be representable as a KeyFileExt.  akeyconvert detects
       such a situation and does not perform any key conversions until the conflict is removed.

       Many of the concerns given in asetkey(8) regarding extracting new Kerberos keys with
       "ktadd" are also applicable to changes involving the rxkad.keytab.

EXAMPLES

       In a cell which is using the rxkad-k5 extension, the following command will read the
       newest keys from the rxkad.keytab and write them to the KeyFileExt in the appropriate
       format.

           % akeyconvert

       In a cell which has a key of kvno 2 and enctype aes128-cts-hmac-sha1-96 for both
       afs/example.com@EXAMPLE.COM and a different key with the same kvno and enctype but for the
       principal afs@EXAMPLE.COM, akeyconvert will detect the kvno/enctype collision and refuse
       to continue.  The appropriate Kerberos keytab-manipulation tools should be used to
       generate a new key (of higher kvno) for one of the colliding principals and remove the old
       (colliding) key for that principal before akeyconvert is used.

           % akeyconvert -all
           Duplicate kvno/enctype 2/17
           FATAL: duplicate key identifiers found.

PRIVILEGE REQUIRED

       The issuer must be able to read the rxkad.keytab and write the KeyFile and KeyFileExt,
       normally /etc/openafs/server/KeyFile and /etc/openafs/server/KeyFileExt.  In practice,
       this means that the issuer must be the local superuser "root" on the AFS file server or
       database server.

SEE ALSO

       KeyFile(5), KeyFileExt(5), asetkey(8),

COPYRIGHT

       Copyright 2015 Massachusetts Institute of Technology.

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