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# Copyright © 2009-2011 Raphaël Hertzog <hertzog@debian.org>
#
# Hardening build flags handling derived from work of:
# Copyright © 2009-2011 Kees Cook <kees@debian.org>
# Copyright © 2007-2008 Canonical, Ltd.
#
# 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::Vendor::Debian;
use strict;
use warnings;
our $VERSION = '0.01';
use parent qw(Dpkg::Vendor::Default);
use Dpkg::Gettext;
use Dpkg::ErrorHandling;
use Dpkg::Control::Types;
use Dpkg::BuildOptions;
use Dpkg::Arch qw(get_host_arch debarch_to_debtriplet);
=encoding utf8
=head1 NAME
Dpkg::Vendor::Debian - Debian vendor object
=head1 DESCRIPTION
This vendor object customize the behaviour of dpkg scripts
for Debian specific actions.
=cut
sub run_hook {
my ($self, $hook, @params) = @_;
if ($hook eq 'keyrings') {
return ('/usr/share/keyrings/debian-keyring.gpg',
'/usr/share/keyrings/debian-maintainers.gpg');
} elsif ($hook eq 'register-custom-fields') {
} elsif ($hook eq 'extend-patch-header') {
my ($textref, $ch_info) = @params;
if ($ch_info->{'Closes'}) {
foreach my $bug (split(/\s+/, $ch_info->{'Closes'})) {
$$textref .= "Bug-Debian: http://bugs.debian.org/$bug\n";
}
}
# XXX: Layer violation...
require Dpkg::Vendor::Ubuntu;
my $b = Dpkg::Vendor::Ubuntu::find_launchpad_closes($ch_info->{'Changes'});
foreach my $bug (@$b) {
$$textref .= "Bug-Ubuntu: https://bugs.launchpad.net/bugs/$bug\n";
}
} elsif ($hook eq 'update-buildflags') {
$self->add_hardening_flags(@params);
} else {
return $self->SUPER::run_hook($hook, @params);
}
}
sub add_hardening_flags {
my ($self, $flags) = @_;
my $arch = get_host_arch();
my ($abi, $os, $cpu) = debarch_to_debtriplet($arch);
unless (defined $abi and defined $os and defined $cpu) {
warning(_g("unknown host architecture '%s'"), $arch);
($abi, $os, $cpu) = ('', '', '');
}
# Features enabled by default for all builds.
my %use_feature = (
pie => 0,
stackprotector => 1,
fortify => 1,
format => 1,
relro => 1,
bindnow => 0,
);
# Adjust features based on Maintainer's desires.
my $opts = Dpkg::BuildOptions->new(envvar => 'DEB_BUILD_MAINT_OPTIONS');
foreach my $feature (split(/,/, $opts->get('hardening') // '')) {
$feature = lc($feature);
if ($feature =~ s/^([+-])//) {
my $value = ($1 eq '+') ? 1 : 0;
if ($feature eq 'all') {
$use_feature{$_} = $value foreach keys %use_feature;
} else {
if (exists $use_feature{$feature}) {
$use_feature{$feature} = $value;
} else {
warning(_g('unknown hardening feature: %s'), $feature);
}
}
} else {
warning(_g('incorrect value in hardening option of ' .
'DEB_BUILD_MAINT_OPTIONS: %s'), $feature);
}
}
# Mask features that are not available on certain architectures.
if ($os !~ /^(linux|knetbsd|hurd)$/ or
$cpu =~ /^(hppa|mips|mipsel|avr32)$/) {
# Disabled on non-linux/knetbsd/hurd (see #430455 and #586215).
# Disabled on hppa, mips/mipsel (#532821), avr32
# (#574716).
$use_feature{pie} = 0;
}
if ($cpu =~ /^(ia64|alpha|mips|mipsel|hppa)$/ or $arch eq 'arm') {
# Stack protector disabled on ia64, alpha, mips, mipsel, hppa.
# "warning: -fstack-protector not supported for this target"
# Stack protector disabled on arm (ok on armel).
# compiler supports it incorrectly (leads to SEGV)
$use_feature{stackprotector} = 0;
}
if ($cpu =~ /^(ia64|hppa|avr32)$/) {
# relro not implemented on ia64, hppa, avr32.
$use_feature{relro} = 0;
}
# Mask features that might be influenced by other flags.
if ($flags->{build_options}->has('noopt')) {
# glibc 2.16 and later warn when using -O0 and _FORTIFY_SOURCE.
$use_feature{fortify} = 0;
}
# Handle logical feature interactions.
if ($use_feature{relro} == 0) {
# Disable bindnow if relro is not enabled, since it has no
# hardening ability without relro and may incur load penalties.
$use_feature{bindnow} = 0;
}
# PIE
if ($use_feature{pie}) {
$flags->append('CFLAGS', '-fPIE');
$flags->append('FFLAGS', '-fPIE');
$flags->append('CXXFLAGS', '-fPIE');
$flags->append('GCJFLAGS', '-fPIE');
$flags->append('LDFLAGS', '-fPIE -pie');
}
# Stack protector
if ($use_feature{stackprotector}) {
$flags->append('CFLAGS', '-fstack-protector --param=ssp-buffer-size=4');
$flags->append('FFLAGS', '-fstack-protector --param=ssp-buffer-size=4');
$flags->append('CXXFLAGS', '-fstack-protector --param=ssp-buffer-size=4');
$flags->append('GCJFLAGS', '-fstack-protector --param=ssp-buffer-size=4');
}
# Fortify Source
if ($use_feature{fortify}) {
$flags->append('CPPFLAGS', '-D_FORTIFY_SOURCE=2');
}
# Format Security
if ($use_feature{format}) {
$flags->append('CFLAGS', '-Wformat -Werror=format-security');
$flags->append('CXXFLAGS', '-Wformat -Werror=format-security');
}
# Read-only Relocations
if ($use_feature{relro}) {
$flags->append('LDFLAGS', '-Wl,-z,relro');
}
# Bindnow
if ($use_feature{bindnow}) {
$flags->append('LDFLAGS', '-Wl,-z,now');
}
# Store the feature usage.
while (my ($feature, $enabled) = each %use_feature) {
$flags->set_feature('hardening', $feature, $enabled);
}
}
1;