.\"
.\" rpc.gssd(8)
.\"
.\" Copyright (C) 2003 J. Bruce Fields <bfields@umich.edu>
.TH rpc.gssd 8 "14 Mar 2007"
.SH NAME
rpc.gssd \- rpcsec_gss daemon
.SH SYNOPSIS
.B "rpc.gssd [-f] [-n] [-k keytab] [-p pipefsdir] [-v] [-r] [-d ccachedir]"
.SH 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
.B rpc.gssd
to establish security contexts.  The
.B rpc.gssd
daemon uses files in the rpc_pipefs filesystem to communicate with the kernel.

.SH OPTIONS
.TP
.B -f
Runs
.B rpc.gssd
in the foreground and sends output to stderr (as opposed to syslogd)
.TP
.B -n
By default,
.B 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
attemtpting to mount an nfs filesystem requiring Kerberos
authentication.
.TP
.B -k keytab
Tells
.B rpc.gssd
to use the keys found in
.I keytab
to obtain "machine credentials".
The default value is "/etc/krb5.keytab".
.IP
Previous versions of
.B 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:
.br
  root/<hostname>@<REALM>
.br
  nfs/<hostname>@<REALM>
.br
  host/<hostname>@<REALM>
.br
  root/<anyname>@<REALM>
.br
  nfs/<anyname>@<REALM>
.br
  host/<anyname>@<REALM>
.TP
.B -p path
Tells
.B rpc.gssd
where to look for the rpc_pipefs filesystem.  The default value is
"/var/lib/nfs/rpc_pipefs".
.TP
.B -d directory
Tells
.B rpc.gssd
where to look for kerberos credential files.  The default value is "/tmp".
.TP
.B -v
Increases the verbosity of the output (can be specified multiple times).
.TP
.B -r
If the rpcsec_gss library supports setting debug level,
increases the verbosity of the output (can be specified multiple times).
.SH SEE ALSO
.BR rpc.svcgssd(8)
.SH AUTHORS
.br
Dug Song <dugsong@umich.edu>
.br
Andy Adamson <andros@umich.edu>
.br
Marius Aamodt Eriksen <marius@umich.edu>
.br
J. Bruce Fields <bfields@umich.edu>