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# binaries/hardening -- lintian check script -*- perl -*-
# Copyright (C) 1998 Christian Schwarz and Richard Braakman
# Copyright (C) 2012 Kees Cook
# Copyright (C) 2017-2020 Chris Lamb <lamby@debian.org>
# Copyright (C) 2021 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::Binaries::Hardening;
use v5.20;
use warnings;
use utf8;
use Moo;
use namespace::clean;
with 'Lintian::Check';
has HARDENED_FUNCTIONS => (
is => 'rw',
lazy => 1,
default => sub {
my ($self) = @_;
return $self->data->load('binaries/hardened-functions');
}
);
has recommended_hardening_features => (
is => 'rw',
lazy => 1,
default => sub {
my ($self) = @_;
my %recommended_hardening_features;
my $hardening_buildflags = $self->data->hardening_buildflags;
my $architecture = $self->processable->fields->value('Architecture');
%recommended_hardening_features
= map { $_ => 1 }
@{$hardening_buildflags->recommended_features->{$architecture}}
if $architecture ne 'all';
return \%recommended_hardening_features;
}
);
has built_with_golang => (
is => 'rw',
lazy => 1,
default => sub {
my ($self) = @_;
my $built_with_golang = $self->processable->name =~ m/^golang-/;
my $source = $self->group->source;
$built_with_golang
= $source->relation('Build-Depends-All')
->satisfies('golang-go | golang-any')
if defined $source;
return $built_with_golang;
}
);
sub visit_installed_files {
my ($self, $item) = @_;
my @elf_hardened;
my @elf_unhardened;
for my $symbol (@{$item->elf->{SYMBOLS}}) {
next
unless $symbol->section eq 'UND';
if ($symbol->name =~ /^__(\S+)_chk$/) {
my $vulnerable = $1;
push(@elf_hardened, $vulnerable)
if $self->HARDENED_FUNCTIONS->recognizes($vulnerable);
} else {
push(@elf_unhardened, $symbol->name)
if $self->HARDENED_FUNCTIONS->recognizes($symbol->name);
}
}
$self->pointed_hint('hardening-no-fortify-functions', $item->pointer)
if @elf_unhardened
&& !@elf_hardened
&& !$self->built_with_golang
&& $self->recommended_hardening_features->{fortify};
for my $member_name (keys %{$item->elf_by_member}) {
my @member_hardened;
my @member_unhardened;
for my $symbol (@{$item->elf_by_member->{$member_name}{SYMBOLS}}) {
next
unless $symbol->section eq 'UND';
if ($symbol->name =~ /^__(\S+)_chk$/) {
my $vulnerable = $1;
push(@member_hardened, $vulnerable)
if $self->HARDENED_FUNCTIONS->recognizes($vulnerable);
} else {
push(@member_unhardened, $symbol->name)
if $self->HARDENED_FUNCTIONS->recognizes($symbol->name);
}
}
$self->pointed_hint('hardening-no-fortify-functions',
$item->pointer, $member_name)
if @member_unhardened
&& !@member_hardened
&& !$self->built_with_golang
&& $self->recommended_hardening_features->{fortify};
}
return
if $self->processable->type eq 'udeb';
return
unless $item->is_file;
return
if $item->file_type !~ m{^ [^,]* \b ELF \b }x
|| $item->file_type !~ m{ \b executable | shared [ ] object \b }x;
# dynamically linked?
return
unless exists $item->elf->{NEEDED};
$self->pointed_hint('hardening-no-relro', $item->pointer)
if $self->recommended_hardening_features->{relro}
&& !$self->built_with_golang
&& !$item->elf->{PH}{RELRO};
$self->pointed_hint('hardening-no-bindnow', $item->pointer)
if $self->recommended_hardening_features->{bindnow}
&& !$self->built_with_golang
&& !exists $item->elf->{FLAGS_1}{NOW};
$self->pointed_hint('hardening-no-pie', $item->pointer)
if $self->recommended_hardening_features->{pie}
&& !$self->built_with_golang
&& $item->elf->{'ELF-HEADER'}{Type} =~ m{^ EXEC }x;
return;
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
|
