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# ex:ts=8 sw=4:
# $OpenBSD: signify.pm,v 1.12 2014/03/05 22:42:36 espie Exp $
#
# Copyright (c) 2013-2014 Marc Espie <espie@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
use strict;
use warnings;
package OpenBSD::signify;
use OpenBSD::PackageInfo;
use OpenBSD::Paths;
use File::Temp qw/mkstemp/;
my $header = "untrusted comment: signify -- signature\n";
my $cmd = OpenBSD::Paths->signify;
my $suffix = ".sig";
sub compute_signature
{
my ($plist, $state, $key, $pub) = @_;
my $contents = $plist->infodir.CONTENTS;
my $sigfile = $contents.$suffix;
open my $fh, ">", $contents;
$plist->write_no_sig($fh);
close $fh;
$state->system($cmd, '-S', '-q', '-s', $key, '-m', $contents) == 0 or
$state->fatal("problem generating signature");
if (defined $pub) {
$state->system($cmd, '-V', '-q', '-p', $pub, '-m',
$contents) == 0 or
$state->fatal("public key and private key don't match");
}
open(my $sighandle, '<', $sigfile)
or $state->fatal("problem reading signature");
my $header = <$sighandle>;
my $sig = <$sighandle>;
close($sighandle);
unlink($sigfile);
chomp $sig;
return $sig;
}
sub check_signature
{
my ($plist, $state) = @_;
if (!$plist->has('signer')) {
$state->errsay("Invalid signed plist: no \@signer");
return 0;
}
my $signer = $plist->get('signer')->name;
my $pubkey = OpenBSD::Paths->signifykey($signer);
if (!-f $pubkey) {
$state->errsay("Can't find key #1 for signer #1", $pubkey,
$signer);
return 0;
}
my $sig = $plist->get('digital-signature');
my ($fh, $fname) = mkstemp("/tmp/pkgcontent.XXXXXXXXX");
$plist->write_no_sig($fh);
open(my $fh2, ">", $fname.$suffix);
print $fh2 $header, $sig->{b64sig}, "\n";
close $fh;
close $fh2;
my $rc = $state->system($cmd, '-V', '-q', '-p', $pubkey, '-m', $fname);
unlink $fname;
unlink $fname.$suffix;
if ($rc != 0) {
$state->log("Bad signature");
return 0;
}
if (!grep
{ref($_) eq 'Regexp' ? $signer =~ $_ : $_ eq $signer}
@{$state->signer_list}) {
$state->errsay("Package signed by untrusted party #1", $signer);
return 0;
}
return 1;
}
1;
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