/usr/share/perl5/Dpkg/Vendor/Debian.pm is in libdpkg-perl 1.17.5ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | # 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;
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