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- #!/usr/bin/perl -w
-
- # luksformat - wrapper around LUKS-capable cryptsetup and mkfs for easy
- # creation of an encrypted device.
- #
- # (C) 2005 Canonical Ltd.
- # Author: Martin Pitt <martin.pitt@ubuntu.com>
- # License: GNU General Public License, v2 or any later
- # (http://www.gnu.org/copyleft/gpl.html)
-
- use Getopt::Long;
-
- sub help() {
- print "luksformat - Create and format an encrypted LUKS device
- Usage: luksformat [-t <file system>] <device>\n";
- exit 1;
- }
-
- # default file system
- $fs = 'vfat';
- exit 1 unless GetOptions ('t|type=s' => \$fs);
-
- help() if $#ARGV != 0;
-
- if ($> != 0) {
- print STDERR "This program needs to be started as root\n";
- exit 1;
- }
-
- $device = $ARGV[0];
-
- open(MOUNTS, "/proc/mounts");
- while (<MOUNTS>) {
- die "Error: device mounted: $device\n" if (/\Q$device\E/)
- }
-
- $mkfs = "/sbin/mkfs.$fs";
- if (! -x $mkfs) {
- print STDERR "Error: invalid file system: $fs\n";
- exit 1;
- }
-
- # generate temporary mapped device name which is not yet used
- $name = "";
- for ($i = 1; $i < 100; $i++) {
- if (! -e "/dev/mapper/luksformat$i") {
- $name = "luksformat$i";
- last;
- }
- }
-
- $name or die "Error: could not generate temporary mapped device name";
-
- # we do not need to be overly concerned with race conditions here, cryptsetup
- # will just fail if the name already exists now.
- print "Creating encrypted device on $device...\n";
- if ((system 'cryptsetup', 'luksFormat', '-s', '256', '--cipher', 'aes-cbc-essiv:sha256', $device)) {
- die "Could not create LUKS device $device";
- }
-
- print "Please enter your passphrase again to verify it\n";
- if ((system 'cryptsetup', 'luksOpen', $device, $name) != 0) {
- print STDERR "The passphrases you entered were not identical\n";
- exit 1;
- }
-
- $result = system $mkfs, "/dev/mapper/$name";
- print "\n";
- system 'cryptsetup', 'luksClose', $name;
-
- die "Could not format device with file system $fs" if $result;
-
- __END__
-
- =head1 NAME
-
- luksformat - Create and format an encrypted LUKS device
-
- =head1 SYNOPSIS
-
- B<luksformat> [B<-t> I<fstype>] I<device>
-
- =head1 DESCRIPTION
-
- B<luksformat> is a wrapper around B<cryptsetup> and B<mkfs> which provides an
- easy interface for creating an encrypted device that follows the LUKS standard
- and for putting a file system onto the encrypted device.
-
- The default file system is B<vfat> since that is most commonly used on
- removable devices. However, you can specify any available file system with the
- B<-t> option.
-
- =head1 SEE ALSO
-
- L<cryptsetup(8)>, L<mkfs(8)>
-
- =head1 AUTHOR
-
- This program was written by Martin Pitt <martin.pitt@ubuntu.com>.
-