freebsd-nq/sbin/gbde/gbde.8

.\"
.\" Copyright (c) 2002 Poul-Henning Kamp
.\" Copyright (c) 2002 Networks Associates Technology, Inc.
.\" All rights reserved.
.\"
.\" This software was developed for the FreeBSD Project by Poul-Henning Kamp
.\" and NAI Labs, the Security Research Division of Network Associates, Inc.
.\" under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
.\" DARPA CHATS research program.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" $FreeBSD$
.\"
.Dd February 12, 2005
.Dt GBDE 8
.Os
.Sh NAME
.Nm gbde
.Nd operation and management utility for Geom Based Disk Encryption
.Sh SYNOPSIS
.Nm
.Cm attach
.Ar destination
.Op Fl l Ar lockfile
.Op Fl p Ar pass-phrase
.Nm
.Cm detach
.Ar destination
.Nm
.Cm init
.Ar destination
.Op Fl i
.Op Fl f Ar filename
.Op Fl L Ar new-lockfile
.Op Fl P Ar new-pass-phrase
.Nm
.Cm setkey
.Ar destination
.Op Fl n Ar key
.Op Fl l Ar lockfile
.Op Fl p Ar pass-phrase
.Op Fl L Ar new-lockfile
.Op Fl P Ar new-pass-phrase
.Nm
.Cm nuke
.Ar destination
.Op Fl n Ar key
.Op Fl l Ar lockfile
.Op Fl p Ar pass-phrase
.Nm
.Cm destroy
.Ar destination
.Op Fl l Ar lockfile
.Op Fl p Ar pass-phrase
.Sh DESCRIPTION
.Bf -symbolic
NOTICE:
Please be aware that this code has not yet received much review
and analysis by qualified cryptographers and therefore should be considered
a slightly suspect experimental facility.
.Pp
We cannot at this point guarantee that the on-disk format will not change
in response to reviews or bug-fixes, so potential users are advised to
be prepared that
.Xr dump 8 Ns / Ns
.Xr restore 8
based migrations may be called for in the future.
.Ef
.Pp
The
.Nm
utility is the only official operation and management interface for the
.Xr gbde 4
.Tn GEOM
based disk encryption kernel facility.
The interaction between the
.Nm
utility and the kernel part is not a published interface.
.Pp
The operational aspect consists of two subcommands:
one to open and attach
a device to the in-kernel cryptographic
.Nm
module
.Pq Cm attach ,
and one to close and detach a device
.Pq Cm detach .
.Pp
The management part allows initialization of the master key and lock sectors
on a device
.Pq Cm init ,
initialization and replacement of pass-phrases
.Pq Cm setkey ,
and key invalidation
.Pq Cm nuke
and blackening
.Pq Cm destroy
functions.
.Pp
The
.Fl l Ar lockfile
argument is used to supply the lock selector data.
If no
.Fl l
option is specified, the first sector is used for this purpose.
.Pp
The
.Fl L Ar new-lockfile
argument
specifies the lock selector file for the key
initialized with the
.Cm init
subcommand
or modified with the
.Cm setkey
subcommand.
.Pp
The
.Fl n Ar key
argument can be used to specify to which of the four keys
the operation applies.
A value of 1 to 4 selects the specified key, a value of 0 (the default)
means
.Dq "this key"
(i.e., the key used to gain access to the device)
and a value of \-1 means
.Dq "all keys" .
.Pp
The
.Fl f Ar filename
specifies an optional parameter file for use under initialization.
.Pp
Alternatively, the
.Fl i
option toggles an interactive mode where a template file with descriptions
of the parameters can be interactively edited.
.Pp
The
.Fl p Ar pass-phrase
argument
specifies the pass-phrase used for opening the device.
If not specified, the controlling terminal will be used to prompt the user
for the pass-phrase.
Be aware that using this option may expose the pass-phrase to other
users who happen to run
.Xr ps 1
or similar while the command is running.
.Pp
The
.Fl P Ar new-pass-phrase
argument
can be used to specify the new pass-phrase to the
.Cm init
and
.Cm setkey
subcommands.
If not specified, the user is prompted for the new pass-phrase on the
controlling terminal.
Be aware that using this option may expose the pass-phrase to other
users who happen to run
.Xr ps 1
or similar while the command is running.
.Sh EXAMPLES
To initialize a device, using default parameters:
.Pp
.Dl "gbde init /dev/ad0s1f -L /etc/ad0s1f.lock"
.Pp
To attach an encrypted device:
.Pp
.Dl "gbde attach ad0s1f -l /etc/ad0s1f.lock"
.Pp
The encrypted device has the suffix
.Pa .bde
so a typical
command to create and mount a file system would be:
.Pp
.Dl "newfs /dev/ad0s1f.bde"
.Dl "mount /dev/ad0s1f.bde /secret"
.Pp
To detach an encrypted device:
.Pp
.Dl "gbde detach ad0s1f"
.Pp
Please notice that detaching an encrypted device corresponds to
physically removing it, do not forget to unmount the file system first.
.Pp
To initialize the second key using a detached lockfile and a trivial
pass-phrase:
.Pp
.Dl "gbde setkey ad0s1f -n 2 -P foo -L key2.lockfile"
.Pp
To destroy all copies of the masterkey:
.Pp
.Dl "gbde destroy ad0s1f -n -1"
.Sh SEE ALSO
.Xr gbde 4 ,
.Xr geom 4
.Sh HISTORY
This software was developed for the
.Fx
Project by
.An "Poul-Henning Kamp"
and NAI Labs, the Security Research Division of Network Associates, Inc.\&
under DARPA/SPAWAR contract N66001-01-C-8035
.Pq Dq CBOSS ,
as part of the
DARPA CHATS research program.
.Sh AUTHORS
.An "Poul-Henning Kamp" Aq phk@FreeBSD.org
.Sh BUGS
The cryptographic algorithms and the overall design have not been
attacked mercilessly for over 10 years by a gang of cryptoanalysts.