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package fs::dmcrypt; # $Id: $
use diagnostics;
use strict;
#-######################################################################################
#- misc imports
#-######################################################################################
use common;
use fs::type;
use fs::get;
use run_program;
sub _crypttab() { "$::prefix/etc/crypttab" }
sub init() {
whereis_binary('cryptsetup') or die "cryptsetup not installed";
eval { modules::load('dm-crypt', 'cbc', 'sha256_generic', arch() =~ /i.86/ ? 'aes-i586' : 'aes') };
devices::init_device_mapper();
1;
}
my $initialized;
sub _ensure_initialized() {
$initialized++ or init();
}
sub read_crypttab {
my ($all_hds) = @_;
-e _crypttab() or return;
my @raw_parts = grep { fs::type::isRawLUKS($_) } fs::get::really_all_fstab($all_hds);
foreach (cat_(_crypttab())) {
my ($dm_name, $dev) = split;
my $raw_part = fs::get::device2part($dev, \@raw_parts)
or log::l("crypttab: unknown device $dev for $dm_name"), next;
$raw_part->{dm_name} = $dm_name;
}
}
sub save_crypttab {
my ($all_hds) = @_;
my @raw_parts = grep { $_->{dm_name} } fs::get::really_all_fstab($all_hds) or return;
my %names = map { $_->{dm_name} => fs::wild_device::from_part('', $_) } @raw_parts;
substInFile {
my ($name, $_dev) = split;
if (my $new_dev = delete $names{$name}) {
$_ = "$name $new_dev\n";
}
if (eof) {
$_ .= join('', map { "$_ $names{$_}\n" } sort keys %names);
}
} _crypttab();
}
sub format_part {
my ($part) = @_;
my $tmp_key_file = "/tmp/.dmcrypt_key-$$";
common::with_private_tmp_file($tmp_key_file, $part->{dmcrypt_key}, sub {
_run_or_die('luksFormat', '--batch-mode', devices::make($part->{device}), $_[0]);
});
fs::format::after_formatting($part, 1);
}
sub open_part {
my ($dmcrypts, $part) = @_;
my $tmp_key_file = "/tmp/.dmcrypt_key-$$";
common::with_private_tmp_file($tmp_key_file, $part->{dmcrypt_key}, sub {
_run_or_die('luksOpen', devices::make($part->{device}),
$part->{dm_name}, '--key-file', $_[0]);
});
my $active_dmcrypt = _parse_dmsetup_table($part->{dm_name},
run_program::get_stdout('dmsetup', 'table', $part->{dm_name}));
push @$dmcrypts, _get_existing_one([$part], $active_dmcrypt);
}
sub close_part {
my ($dmcrypts, $part) = @_;
my $dm_part = fs::get::device2part("mapper/$part->{dm_name}", $dmcrypts);
_run_or_die('luksClose', devices::make($dm_part->{device}));
$part->{dm_active} = 0;
@$dmcrypts = grep { $_ != $dm_part } @$dmcrypts;
}
sub _run_or_die {
my ($command, @para) = @_;
_ensure_initialized();
run_program::run_or_die('cryptsetup', $command, @para);
}
sub get_existing {
my $fstab = \@_;
map { _get_existing_one($fstab, $_) } active_dmcrypts();
}
sub _get_existing_one {
my ($fstab, $active_dmcrypt) = @_;
my $part = { device => "mapper/$active_dmcrypt->{name}", size => $active_dmcrypt->{size},
options => 'noatime', dmcrypt_name => $active_dmcrypt->{name} };
if (my $raw_part = find { fs::get::is_same_hd($active_dmcrypt, $_) } @$fstab) {
$part->{rootDevice} = $raw_part->{device};
$raw_part->{dm_name} = $active_dmcrypt->{name};
$raw_part->{dm_active} = 1;
} else {
log::l("could not find the device $active_dmcrypt->{major}:$active_dmcrypt->{minor} for $part->{device}");
}
if (my $type = fs::type::type_subpart_from_magic($part)) {
put_in_hash($part, $type);
}
fs::type::set_isFormatted($part, to_bool($part->{fs_type}));
$part->{fs_type} or fs::type::set_fs_type($part, 'ext3');
log::l("dmcrypt: found $part->{device} type $part->{fs_type} with rootDevice $part->{rootDevice}");
$part;
}
sub active_dmcrypts() {
grep { $_->{type} eq 'crypt' } active_dm();
}
sub _parse_dmsetup_table {
my ($name, $s) = @_;
my @l = split(' ', $s);
my ($major, $minor) = split(':', $l[6]);
{ name => $name, size => $l[1], type => $l[2], major => $major, minor => $minor };
}
sub active_dm() {
run_program::run('udevadm', 'settle');
map {
my $name = s/(.*?):\s*// && $1;
_parse_dmsetup_table($name, $_);
} run_program::get_stdout('dmsetup', 'table');
}
1;
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