.\" Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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.\" $FreeBSD: head/sbin/geom/class/shsec/gshsec.8 267667 2014-06-20 09:40:43Z bapt $
.\"
.Dd October 1, 2013
.Dt GSHSEC 8
.Os
.Sh NAME
.Nm gshsec
.Nd "control utility for shared secret devices"
.Sh SYNOPSIS
.Nm
.Cm label
.Op Fl hv
.Ar name
.Ar prov prov ...
.Nm
.Cm stop
.Op Fl fv
.Ar name ...
.Nm
.Cm clear
.Op Fl v
.Ar prov ...
.Nm
.Cm dump
.Ar prov ...
.Nm
.Cm list
.Nm
.Cm status
.Nm
.Cm load
.Nm
.Cm unload
.Sh DESCRIPTION
The
.Nm
utility is used for setting up a device which contains a shared secret.
The secret is shared between the given providers.
To collect the secret, all providers are needed.
If one of the components is missing, there is no way to get any useful data from
the rest of them.
The first argument to
.Nm
indicates an action to be performed:
.Bl -tag -width ".Cm destroy"
.It Cm label
Set up a shared secret device from the given components with the specified
.Ar name .
Metadata are stored in the last sector of every component.
.It Cm stop
Turn off an existing shared secret device by its
.Ar name .
This command does not touch on-disk metadata!
.It Cm clear
Clear metadata on the given providers.
.It Cm dump
Dump metadata stored on the given providers.
.It Cm list
See
.Xr geom 8 .
.It Cm status
See
.Xr geom 8 .
.It Cm load
See
.Xr geom 8 .
.It Cm unload
See
.Xr geom 8 .
.El
.Pp
Additional options:
.Bl -tag -width ".Fl f"
.It Fl f
Force the removal of the specified shared secret device.
.It Fl h
Hardcode providers' names in metadata.
.It Fl v
Be more verbose.
.El
.Sh EXIT STATUS
Exit status is 0 on success, and 1 if the command fails.
.Sh EXAMPLES
The following example shows how to create a shared secret device.
The secret will be split between a slice on a local disk and a USB Pen drive.
.Bd -literal -offset indent
gshsec label -v secret /dev/ada0s1 /dev/da0
newfs /dev/shsec/secret
.Ed
.Pp
From now on, when the USB Pen drive is inserted, it will be automatically
detected and connected, making the secret available via the
.Pa /dev/shsec/secret
device.
.Sh SEE ALSO
.Xr geom 4 ,
.Xr gbde 8 ,
.Xr geom 8 ,
.Xr newfs 8
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 5.4 .
.Sh AUTHORS
.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org