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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
package network::shorewall; # $Id$
use detect_devices;
use network::network;
use run_program;
use common;
use log;
my $shorewall_root = "/etc/shorewall";
our $firewall_icon = $::isInstall ? 'banner-security' : '/usr/share/mcc/themes/default/firewall-mdk.png';
sub check_iptables() {
-f "$::prefix/etc/sysconfig/iptables" ||
$::isStandalone && do {
system('modprobe iptable_nat');
-x '/sbin/iptables' && listlength(`/sbin/iptables -t nat -nL`) > 8;
};
}
sub set_config_file {
my ($file, @l) = @_;
my $done;
substInFile {
if (!$done && (/^#LAST LINE/ || eof)) {
$_ = join('', map { join("\t", @$_) . "\n" } @l) . $_;
$done = 1;
} else {
$_ = '' if /^[^#]/;
}
} "$::prefix${shorewall_root}/$file";
}
sub get_config_file {
my ($file) = @_;
map { [ split ' ' ] } grep { !/^#/ } cat_("$::prefix${shorewall_root}/$file");
}
sub dev_to_shorewall {
my ($dev) = @_;
$dev =~ /^ippp/ && "ippp+" ||
$dev =~ /^ppp/ && "ppp+" ||
$dev;
}
sub get_net_zone_interfaces {
my ($_net, $all_intf) = @_;
#- read shorewall configuration first
my @interfaces = map { $_->[1] } grep { $_->[0] eq 'net' } get_config_file('interfaces');
#- else try to find the best interface available
@interfaces ? @interfaces : @{$all_intf || []};
}
sub get_zones {
my ($conf, $o_in) = @_;
my $net = {};
network::network::read_net_conf($net);
#- find all interfaces but alias interfaces
my @all_intf = grep { !/:/ } uniq(keys(%{$net->{ifcfg}}), detect_devices::get_net_interfaces());
my %net_zone = map { $_ => undef } @all_intf;
$net_zone{$_} = 1 foreach get_net_zone_interfaces($net, \@all_intf);
$o_in and $o_in->ask_from_({
title => N("Firewall configuration"),
icon => $firewall_icon,
messages => N("Please select the interfaces that will be protected by the firewall.
All interfaces directly connected to Internet should be selected,
while interfaces connected to a local network may be unselected.
Which interfaces should be protected?
"),
}, [
map {
{ text => network::tools::get_interface_description($net, $_), val => \$net_zone{$_}, type => 'bool' };
} (sort keys %net_zone) ]);
($conf->{net_zone}, $conf->{loc_zone}) = partition { $net_zone{$_} } keys %net_zone;
}
sub add_interface_to_net_zone {
my ($conf, $interface) = @_;
if (!member($interface, @{$conf->{net_zone}})) {
push @{$conf->{net_zone}}, $interface;
@{$conf->{loc_zone}} = grep { $_ ne $interface } @{$conf->{loc_zone}};
}
}
sub read {
my ($o_in) = @_;
#- read old rules file if config is not moved to rules.drakx yet
my @rules = get_config_file(-f "$::prefix${shorewall_root}/rules.drakx" ? 'rules.drakx' : 'rules');
my %conf = (disabled => !glob_("$::prefix/etc/rc3.d/S*shorewall"),
ports => join(' ', map {
my $e = $_;
map { "$_/$e->[3]" } split(',', $e->[4]);
} grep { $_->[0] eq 'ACCEPT' && $_->[1] eq 'net' } @rules),
);
$conf{accept_local_user}{$_->[4]} = $_->[8] foreach grep { $_->[0] eq 'ACCEPT+' } @rules;
$conf{redirects}{$_->[3]}{$_->[4]} = $_->[2] foreach grep { $_->[0] eq 'REDIRECT' } @rules;
if (my ($e) = get_config_file('masq')) {
($conf{masq}{net_interface}, $conf{masq}{subnet}) = @$e;
}
my @policy = get_config_file('policy');
$conf{log_net_drop} = @policy ? (any { $_->[0] eq 'net' && $_->[1] eq 'all' && $_->[2] eq 'DROP' && $_->[3] } @policy) : 1;
get_zones(\%conf, $o_in);
@policy && \%conf;
}
sub ports_by_proto {
my ($ports) = @_;
my %ports_by_proto;
foreach (split ' ', $ports) {
m!^(\d+(?::\d+)?)/(udp|tcp|icmp)$! or die "bad port $_\n";
push @{$ports_by_proto{$2}}, $1;
}
\%ports_by_proto;
}
sub upgrade_to_shorewall3() {
#- the 'FW' option has been removed from shorewall.conf as of shorewall 3.0
my $ipsecfile_ok;
substInFile {
undef $_ if /^\s*FW=/;
if ((/^\s*IPSECFILE=/ || eof) && !$ipsecfile_ok) {
$ipsecfile_ok = 1;
$_ = "IPSECFILE=zones\n";
}
} "$::prefix${shorewall_root}/shorewall.conf";
}
sub write {
my ($conf, $o_in) = @_;
my $use_pptp = any { /^ppp/ && cat_("$::prefix/etc/ppp/peers/$_") =~ /pptp/ } @{$conf->{net_zone}};
my $ports_by_proto = ports_by_proto($conf->{ports});
my $has_loc_zone = to_bool(@{$conf->{loc_zone} || []});
my ($include_drakx, $other_rules) = partition { $_ eq "INCLUDE\trules.drakx\n" } grep { !/^#/ } cat_("$::prefix${shorewall_root}/rules");
#- warn if the config is already in rules.drakx and additionnal rules are configured
if (!is_empty_array_ref($include_drakx) && !is_empty_array_ref($other_rules)) {
my %actions = (
keep => N("Keep custom rules"),
drop => N("Drop custom rules"),
);
my $action = 'keep';
!$o_in || $o_in->ask_from_(
{
messages => N("Your firewall configuration has been manually edited and contains
rules that may conflict with the configuration that has just been set up.
What do you want to do?"),
title => N("Firewall"),
icon => 'banner-security',
},
[ { val => \$action, type => 'list', list => [ 'keep', 'drop' ], format => sub { $actions{$_[0]} } } ]) or return;
#- reset the rules files if the user has chosen to drop modifications
undef $include_drakx if $action eq 'drop';
}
my $interface_settings = sub {
my ($zone, $interface) = @_;
[ $zone, $interface, 'detect', if_(detect_devices::is_bridge_interface($interface), 'routeback') ];
};
set_config_file("zones",
[ 'net', 'ipv4' ],
if_($has_loc_zone, [ 'loc', 'ipv4' ]),
[ 'fw', 'firewall' ],
);
set_config_file('interfaces',
(map { $interface_settings->('net', $_) } @{$conf->{net_zone}}),
(map { $interface_settings->('loc', $_) } @{$conf->{loc_zone} || []}),
);
set_config_file('policy',
if_($has_loc_zone, [ 'loc', 'net', 'ACCEPT' ], [ 'loc', 'fw', 'ACCEPT' ], [ 'fw', 'loc', 'ACCEPT' ]),
[ 'fw', 'net', 'ACCEPT' ],
[ 'net', 'all', 'DROP', if_($conf->{log_net_drop}, 'info') ],
[ 'all', 'all', 'REJECT', 'info' ],
);
if (is_empty_array_ref($include_drakx)) {
#- make sure the rules.drakx config is read, erasing user modifications
set_config_file('rules', [ 'INCLUDE', 'rules.drakx' ]);
}
output_with_perm("$::prefix${shorewall_root}/" . 'rules.drakx', 0600, map { join("\t", @$_) . "\n" } (
if_($use_pptp, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'tcp', '1723' ]),
if_($use_pptp, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'gre' ]),
(map_each { [ 'ACCEPT', 'net', 'fw', $::a, join(',', @$::b), '-' ] } %$ports_by_proto),
(map_each {
if_($::b, [ 'ACCEPT+', 'fw', 'net', 'tcp', $::a, '-', '-', '-', $::b ]);
} %{$conf->{accept_local_user}}),
(map {
#- WARNING: won't redirect ports from the firewall system if a local zone exists
map_each {
[ 'REDIRECT', $has_loc_zone ? 'loc' : 'fw', $::b, $_, $::a, '-' ];
} %{$conf->{redirects}{$_}};
} keys %{$conf->{redirects}}),
));
set_config_file('masq', if_(exists $conf->{masq}, [ $conf->{masq}{net_interface}, $conf->{masq}{subnet} ]));
upgrade_to_shorewall3();
require services;
if ($conf->{disabled}) {
services::disable('shorewall', $::isInstall);
run_program::rooted($::prefix, '/sbin/shorewall', 'clear') unless $::isInstall;
} else {
services::enable('shorewall', $::isInstall);
}
}
sub set_redirected_ports {
my ($conf, $proto, $dest, @ports) = @_;
if (@ports) {
$conf->{redirects}{$proto}{$_} = $dest foreach @ports;
} else {
my $r = $conf->{redirects}{$proto};
@ports = grep { $r->{$_} eq $dest } keys %$r;
delete $r->{$_} foreach @ports;
}
}
sub update_interfaces_list {
my ($o_intf) = @_;
$o_intf && member($o_intf, map { $_->[1] } get_config_file('interfaces')) and return;
my $shorewall = network::shorewall::read();
$shorewall && !$shorewall->{disabled} and network::shorewall::write($shorewall);
}
1;
|
