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# Copyright © 2017 Guillem Jover <guillem@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
=encoding utf8
=head1 NAME
Dpkg::OpenPGP - multi-backend OpenPGP support
=head1 DESCRIPTION
This module provides a class for transparent multi-backend OpenPGP support.
B<Note>: This is a private module, its API can change at any time.
=cut
package Dpkg::OpenPGP 0.01;
use strict;
use warnings;
use List::Util qw(none);
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::IPC;
use Dpkg::Path qw(find_command);
my @BACKENDS = qw(
sop
sq
gpg
);
my %BACKEND = (
sop => 'SOP',
sq => 'Sequoia',
gpg => 'GnuPG',
);
sub new {
my ($this, %opts) = @_;
my $class = ref($this) || $this;
my $self = {};
bless $self, $class;
my $backend = $opts{backend} // 'auto';
my %backend_opts = (
cmdv => $opts{cmdv} // 'auto',
cmd => $opts{cmd} // 'auto',
);
if ($backend eq 'auto') {
# Defaults for stateless full API auto-detection.
$opts{needs}{api} //= 'full';
$opts{needs}{keystore} //= 0;
if (none { $opts{needs}{api} eq $_ } qw(full verify)) {
error(g_('unknown OpenPGP api requested %s'), $opts{needs}{api});
}
$self->{backend} = $self->_auto_backend($opts{needs}, %backend_opts);
} elsif (exists $BACKEND{$backend}) {
$self->{backend} = $self->_load_backend($BACKEND{$backend}, %backend_opts);
if (! $self->{backend}) {
error(g_('cannot load OpenPGP backend %s'), $backend);
}
} else {
error(g_('unknown OpenPGP backend %s'), $backend);
}
return $self;
}
sub _load_backend {
my ($self, $backend, %opts) = @_;
my $module = "Dpkg::OpenPGP::Backend::$backend";
eval qq{
require $module;
};
return if $@;
return $module->new(%opts);
}
sub _auto_backend {
my ($self, $needs, %opts) = @_;
foreach my $backend (@BACKENDS) {
my $module = $self->_load_backend($BACKEND{$backend}, %opts);
if ($needs->{api} eq 'verify') {
next if ! $module->has_verify_cmd();
} else {
next if ! $module->has_backend_cmd();
}
next if $needs->{keystore} && ! $module->has_keystore();
return $module;
}
# Otherwise load a dummy backend.
return Dpkg::OpenPGP::Backend->new();
}
sub can_use_secrets {
my ($self, $key) = @_;
return 0 unless $self->{backend}->has_backend_cmd();
return 0 if $key->type eq 'keyfile' && ! -f $key->handle;
return 0 if $key->type eq 'keystore' && ! -e $key->handle;
return 0 unless $self->{backend}->can_use_key($key);
return 1;
}
sub get_trusted_keyrings {
my $self = shift;
return $self->{backend}->get_trusted_keyrings();
}
sub armor {
my ($self, $type, $in, $out) = @_;
return $self->{backend}->armor($type, $in, $out);
}
sub dearmor {
my ($self, $type, $in, $out) = @_;
return $self->{backend}->dearmor($type, $in, $out);
}
sub inline_verify {
my ($self, $inlinesigned, $data, @certs) = @_;
return $self->{backend}->inline_verify($inlinesigned, $data, @certs);
}
sub verify {
my ($self, $data, $sig, @certs) = @_;
return $self->{backend}->verify($data, $sig, @certs);
}
sub inline_sign {
my ($self, $data, $inlinesigned, $key) = @_;
return $self->{backend}->inline_sign($data, $inlinesigned, $key);
}
=head1 CHANGES
=head2 Version 0.xx
This is a private module.
=cut
1;
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