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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/>.
package Dpkg::OpenPGP;
use strict;
use warnings;
use POSIX qw(:sys_wait_h);
use Exporter qw(import);
use File::Temp;
use File::Copy;
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::IPC;
use Dpkg::Path qw(find_command);
our $VERSION = '0.01';
our @EXPORT = qw(
openpgp_sig_to_asc
);
sub _armor_gpg {
my ($sig, $asc) = @_;
my @gpg_opts = qw(--no-options);
open my $fh_asc, '>', $asc
or syserr(g_('cannot create signature file %s'), $asc);
open my $fh_gpg, '-|', 'gpg', @gpg_opts, '-o', '-', '--enarmor', $sig
or syserr(g_('cannot execute %s program'), 'gpg');
while (my $line = <$fh_gpg>) {
next if $line =~ m/^Version: /;
next if $line =~ m/^Comment: /;
$line =~ s/ARMORED FILE/SIGNATURE/;
print { $fh_asc } $line;
}
close $fh_gpg or subprocerr('gpg');
close $fh_asc or syserr(g_('cannot write signature file %s'), $asc);
return $asc;
}
sub openpgp_sig_to_asc
{
my ($sig, $asc) = @_;
if (-e $sig) {
my $is_openpgp_ascii_armor = 0;
open my $fh_sig, '<', $sig or syserr(g_('cannot open %s'), $sig);
while (<$fh_sig>) {
if (m/^-----BEGIN PGP /) {
$is_openpgp_ascii_armor = 1;
last;
}
}
close $fh_sig;
if ($is_openpgp_ascii_armor) {
notice(g_('signature file is already OpenPGP ASCII armor, copying'));
copy($sig, $asc);
return $asc;
}
if (find_command('gpg')) {
return _armor_gpg($sig, $asc);
} else {
warning(g_('cannot OpenPGP ASCII armor signature file due to missing gpg'));
}
}
return;
}
sub import_key {
my ($asc, %opts) = @_;
$opts{require_valid_signature} //= 1;
my @exec;
if (find_command('gpg')) {
push @exec, 'gpg';
} elsif ($opts{require_valid_signature}) {
error(g_('cannot import key in %s since GnuPG is not installed'),
$asc);
} else {
warning(g_('cannot import key in %s since GnuPG is not installed'),
$asc);
return;
}
my $gpghome = File::Temp->newdir('dpkg-import-key.XXXXXXXX', TMPDIR => 1);
push @exec, '--homedir', $gpghome;
push @exec, '--no-options', '--no-default-keyring', '-q', '--import';
push @exec, '--keyring', $opts{keyring};
push @exec, $asc;
my ($stdout, $stderr);
spawn(exec => \@exec, wait_child => 1, nocheck => 1, timeout => 10,
to_string => \$stdout, error_to_string => \$stderr);
if (WIFEXITED($?)) {
my $status = WEXITSTATUS($?);
print { *STDERR } "$stdout$stderr" if $status;
if ($status == 1 or ($status && $opts{require_valid_signature})) {
error(g_('failed to import key in %s'), $asc);
} elsif ($status) {
warning(g_('failed to import key in %s'), $asc);
}
} else {
subprocerr("@exec");
}
}
sub verify_signature {
my ($sig, %opts) = @_;
$opts{require_valid_signature} //= 1;
my @exec;
if (find_command('gpgv')) {
push @exec, 'gpgv';
} elsif (find_command('gpg')) {
my @gpg_opts = qw(--no-options --no-default-keyring -q);
push @exec, 'gpg', @gpg_opts, '--verify';
} elsif ($opts{require_valid_signature}) {
error(g_('cannot verify signature on %s since GnuPG is not installed'),
$sig);
} else {
warning(g_('cannot verify signature on %s since GnuPG is not installed'),
$sig);
return;
}
my $gpghome = File::Temp->newdir('dpkg-verify-sig.XXXXXXXX', TMPDIR => 1);
push @exec, '--homedir', $gpghome;
foreach my $keyring (@{$opts{keyrings}}) {
push @exec, '--keyring', $keyring;
}
push @exec, $sig;
push @exec, $opts{datafile} if exists $opts{datafile};
my ($stdout, $stderr);
spawn(exec => \@exec, wait_child => 1, nocheck => 1, timeout => 10,
to_string => \$stdout, error_to_string => \$stderr);
if (WIFEXITED($?)) {
my $status = WEXITSTATUS($?);
print { *STDERR } "$stdout$stderr" if $status;
if ($status == 1 or ($status && $opts{require_valid_signature})) {
error(g_('failed to verify signature on %s'), $sig);
} elsif ($status) {
warning(g_('failed to verify signature on %s'), $sig);
}
} else {
subprocerr("@exec");
}
}
1;
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