rpc.gssd(8)                                                                                                          rpc.gssd(8)



NAME
       rpc.gssd - rpcsec_gss daemon

SYNOPSIS
       rpc.gssd [-f] [-n] [-k keytab] [-p pipefsdir] [-v] [-r] [-d ccachedir]

DESCRIPTION
       The  rpcsec_gss  protocol gives a means of using the gss-api generic security api to provide security for protocols using
       rpc (in particular, nfs).  Before exchanging any rpc requests using rpcsec_gss, the rpc client  must  first  establish  a
       security  context.  The linux kernel's implementation of rpcsec_gss depends on the userspace daemon rpc.gssd to establish
       security contexts.  The rpc.gssd daemon uses files in the rpc_pipefs filesystem to communicate with the kernel.


OPTIONS
       -f     Runs rpc.gssd in the foreground and sends output to stderr (as opposed to syslogd)

       -n     By default, rpc.gssd treats accesses by the user with UID 0 specially, and  uses  "machine  credentials"  for  all
              accesses  by  that user which require Kerberos authentication.  With the -n option, "machine credentials" will not
              be used for accesses by UID 0.  Instead, credentials must be obtained manually like all other users.  Use of  this
              option  means  that  "root" must manually obtain Kerberos credentials before attempting to mount an nfs filesystem
              requiring Kerberos authentication.

       -k keytab
              Tells rpc.gssd to use  the  keys  found  in  keytab  to  obtain  "machine  credentials".   The  default  value  is
              "/etc/krb5.keytab".

              Previous  versions  of  rpc.gssd used only "nfs/*" keys found within the keytab.  To be more consistent with other
              implementations, we now look for specific keytab entries.  The search order for keytabs to be  used  for  "machine
              credentials" is now:
                root/<hostname>@<REALM>
                nfs/<hostname>@<REALM>
                host/<hostname>@<REALM>
                root/<anyname>@<REALM>
                nfs/<anyname>@<REALM>
                host/<anyname>@<REALM>

       -p path
              Tells rpc.gssd where to look for the rpc_pipefs filesystem.  The default value is "/var/lib/nfs/rpc_pipefs".

       -d directory
              Tells  rpc.gssd  where  to  look  for Kerberos credential files.  The default value is "/tmp".  This can also be a
              colon separated list of directories to be searched for Kerberos credential files.  Note that  if  machine  creden-
              tials  are  being  stored  in  files,  then  the first directory on this list is where the machine credentials are
              stored.

       -v     Increases the verbosity of the output (can be specified multiple times).

       -r     If the rpcsec_gss library supports setting debug level, increases the verbosity of the output  (can  be  specified
              multiple times).

       -R realm
              Kerberos  tickets  from this realm will be preferred when scanning available credentials cache files to be used to
              create a context.  By default, the default realm, as configured in the Kerberos configuration file, is preferred.

       -t timeout
              Timeout, in seconds, for kernel gss contexts. This option allows you to force new kernel contexts to be negotiated
              after  timeout  seconds,  which  allows  changing  Kerberos  tickets and identities frequently.  The default is no
              explicit timeout, which means the kernel context will live the lifetime of the Kerberos service ticket used in its
              creation.

SEE ALSO
       rpc.svcgssd(8)

AUTHORS
       Dug Song <dugsongATumich.edu>
       Andy Adamson <androsATumich.edu>
       Marius Aamodt Eriksen <mariusATumich.edu>
       J. Bruce Fields <bfieldsATumich.edu>



                                                           14 Mar 2007                                               rpc.gssd(8)