Note to myself, and maybe useful for others too.

Since I request my kerberos tickets with **proxyiable flag**, all my JAAS / GSS (Kerberos) stuff
is now working (almost) perfectly. I need to do extrat test in a web context, but it should
be ok I think. Moreover, I need to understand good the interface used in doAs (a JAAS method).
I hope have enough time to write few documentations about this all stuff.

Notes :

   * JRE's kinit doesn't full directives of /etc/krb5.conf (example: proxiable = true)
   * Obtain a ticket (JRE): kinit -f -p <principal>
   * Obtain a ticket (MIT): kinit <principal> with the following config :

<code>
[libdefaults]
   default_realm = FIMASYS.FR
   forwardable = true
   proxiable = true
   default_tkt_enctypes = des-cbc-md5
   default_tgs_enctypes = des-cbc-md5

[realms]
FIMASYS.FR = {
   kdc = srvfms-5.fimasys.fr
   admin_server = srvfms-5.fimasys.fr
}
</code>

**Beware to enctypes, MIT default enctypes are not supported by the JVM**