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# files/unicode/trojan -- lintian check script -*- perl -*-
# Copyright (C) 1998 Christian Schwarz and Richard Braakman
# Copyright (C) 2019 Chris Lamb <lamby@debian.org>
# Copyright (C) 2020 Felix Lechner
#
# 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, you can find it on the World Wide
# Web at https://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
package Lintian::Check::Files::Unicode::Trojan;
use v5.20;
use warnings;
use utf8;
use Const::Fast;
use Unicode::UTF8 qw(decode_utf8 encode_utf8 valid_utf8);
use Moo;
use namespace::clean;
with 'Lintian::Check';
const my $DOUBLE_QUOTE => q{"};
const my %NAMES_BY_CHARACTER => (
qq{\N{ARABIC LETTER MARK}} => 'ARABIC LETTER MARK', # U+061C
qq{\N{LEFT-TO-RIGHT MARK}} => 'LEFT-TO-RIGHT MARK', # U+200E
qq{\N{RIGHT-TO-LEFT MARK}} => 'RIGHT-TO-LEFT MARK', # U+200F
qq{\N{LEFT-TO-RIGHT EMBEDDING}} => 'LEFT-TO-RIGHT EMBEDDING', # U+202A
qq{\N{RIGHT-TO-LEFT EMBEDDING}} => 'RIGHT-TO-LEFT EMBEDDING', # U+202B
qq{\N{POP DIRECTIONAL FORMATTING}} =>'POP DIRECTIONAL FORMATTING', # U+202C
qq{\N{LEFT-TO-RIGHT OVERRIDE}} => 'LEFT-TO-RIGHT OVERRIDE', # U+202D
qq{\N{RIGHT-TO-LEFT OVERRIDE}} => 'RIGHT-TO-LEFT OVERRIDE', # U+202E
qq{\N{LEFT-TO-RIGHT ISOLATE}} => 'LEFT-TO-RIGHT ISOLATE', # U+2066
qq{\N{RIGHT-TO-LEFT ISOLATE}} => 'RIGHT-TO-LEFT ISOLATE', # U+2067
qq{\N{FIRST STRONG ISOLATE}} => 'FIRST STRONG ISOLATE', # U+2068
qq{\N{POP DIRECTIONAL ISOLATE}} => 'POP DIRECTIONAL ISOLATE', # U+2069
);
sub visit_patched_files {
my ($self, $item) = @_;
$self->check_for_trojan($item);
return;
}
sub visit_installed_files {
my ($self, $item) = @_;
$self->check_for_trojan($item);
return;
}
sub check_for_trojan {
my ($self, $item) = @_;
if (valid_utf8($item->name)) {
my $decoded_name = decode_utf8($item->name);
# all file names
for my $character (keys %NAMES_BY_CHARACTER) {
$self->pointed_hint(
'unicode-trojan',
$item->pointer,
'File name',
sprintf('U+%vX', $character),
$DOUBLE_QUOTE. $NAMES_BY_CHARACTER{$character}. $DOUBLE_QUOTE
) if $decoded_name =~ m{\Q$character\E};
}
}
return
unless $item->is_script;
open(my $fd, '<', $item->unpacked_path)
or die encode_utf8('Cannot open ' . $item->unpacked_path);
my $position = 1;
while (my $line = <$fd>) {
chomp $line;
next
unless valid_utf8($line);
my $decoded = decode_utf8($line);
my $pointer = $item->pointer($position);
for my $character (keys %NAMES_BY_CHARACTER) {
$self->pointed_hint(
'unicode-trojan',
$pointer,
'Contents',
sprintf('U+%vX', $character),
$DOUBLE_QUOTE. $NAMES_BY_CHARACTER{$character}. $DOUBLE_QUOTE
)if $decoded =~ m{\Q$character\E};
}
} continue {
++$position;
}
close $fd;
return;
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
|
