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1 | package PVE::Firewall; | |
2 | ||
3 | use warnings; | |
4 | use strict; | |
5 | use Data::Dumper; | |
6 | use PVE::Tools; | |
7 | use PVE::QemuServer; | |
8 | use File::Path; | |
9 | use IO::File; | |
10 | use Data::Dumper; | |
11 | ||
12 | my $macros; | |
13 | sub get_shorewall_macros { | |
14 | ||
15 | return $macros if $macros; | |
16 | ||
17 | foreach my $path (</usr/share/shorewall/macro.*>) { | |
18 | if ($path =~ m|/macro\.(\S+)$|) { | |
19 | $macros->{$1} = 1; | |
20 | } | |
21 | } | |
22 | return $macros; | |
23 | } | |
24 | ||
25 | ||
26 | my $rule_format = "%-15s %-30s %-30s %-15s %-15s %-15s\n"; | |
27 | ||
28 | my $generate_input_rule = sub { | |
29 | my ($zoneinfo, $rule, $net, $netid) = @_; | |
30 | ||
31 | my $zone = $net->{zone} || die "internal error"; | |
32 | my $zid = $zoneinfo->{$zone}->{zoneref} || die "internal error"; | |
33 | my $tap = $net->{tap} || die "internal error"; | |
34 | ||
35 | my $dest = "$zid:$tap"; | |
36 | ||
37 | if ($rule->{dest}) { | |
38 | $dest .= ":$rule->{dest}"; | |
39 | } | |
40 | ||
41 | my $action = $rule->{service} ? | |
42 | "$rule->{service}($rule->{action})" : $rule->{action}; | |
43 | ||
44 | my $sources = []; | |
45 | ||
46 | if (!$rule->{source}) { | |
47 | push @$sources, 'all'; | |
48 | } elsif ($zoneinfo->{$zone}->{type} eq 'bport') { | |
49 | my $bridge_zone = $zoneinfo->{$zone}->{bridge_zone} || die "internal error"; | |
50 | my $zoneref = $zoneinfo->{$bridge_zone}->{zoneref} || die "internal error"; | |
51 | ||
52 | # using 'all' does not work, so we create one rule for | |
53 | # each related zone on the same bridge | |
54 | push @$sources, "${zoneref}:$rule->{source}"; | |
55 | foreach my $z (keys %$zoneinfo) { | |
56 | next if $z eq $zone; | |
57 | next if !$zoneinfo->{$z}->{bridge_zone}; | |
58 | next if $zoneinfo->{$z}->{bridge_zone} ne $bridge_zone; | |
59 | $zoneref = $zoneinfo->{$z}->{zoneref} || die "internal error"; | |
60 | push @$sources, "${zoneref}:$rule->{source}"; | |
61 | } | |
62 | } else { | |
63 | push @$sources, "all:$rule->{source}"; | |
64 | } | |
65 | ||
66 | my $out = ''; | |
67 | ||
68 | foreach my $source (@$sources) { | |
69 | $out .= sprintf($rule_format, $action, $source, $dest, $rule->{proto} || '-', | |
70 | $rule->{dport} || '-', $rule->{sport} || '-'); | |
71 | } | |
72 | ||
73 | return $out; | |
74 | }; | |
75 | ||
76 | my $generate_output_rule = sub { | |
77 | my ($zoneinfo, $rule, $net, $netid) = @_; | |
78 | ||
79 | my $zone = $net->{zone} || die "internal error"; | |
80 | my $zid = $zoneinfo->{$zone}->{zoneref} || die "internal error"; | |
81 | my $tap = $net->{tap} || die "internal error"; | |
82 | ||
83 | my $action = $rule->{service} ? | |
84 | "$rule->{service}($rule->{action})" : $rule->{action}; | |
85 | ||
86 | my $dest; | |
87 | ||
88 | if (!$rule->{dest}) { | |
89 | $dest = 'all'; | |
90 | } else { | |
91 | $dest = "all:$rule->{dest}"; | |
92 | } | |
93 | ||
94 | return sprintf($rule_format, $action, "$zid:$tap", $dest, | |
95 | $rule->{proto} || '-', $rule->{dport} || '-', $rule->{sport} || '-'); | |
96 | }; | |
97 | ||
98 | # we need complete VM configuration of all VMs (openvz/qemu) | |
99 | # in vmdata | |
100 | ||
101 | my $compile_shorewall = sub { | |
102 | my ($targetdir, $vmdata, $rules) = @_; | |
103 | ||
104 | # remove existing data ? | |
105 | foreach my $file (qw(params zones rules interfaces maclist policy)) { | |
106 | unlink "$targetdir/$file"; | |
107 | } | |
108 | ||
109 | my $netinfo; | |
110 | ||
111 | my $zoneinfo = { | |
112 | fw => { type => 'firewall' }, | |
113 | }; | |
114 | ||
115 | my $maclist = {}; | |
116 | ||
117 | my $register_bridge; | |
118 | ||
119 | $register_bridge = sub { | |
120 | my ($bridge, $vlan) = @_; | |
121 | ||
122 | my $zone = 'z' . $bridge; | |
123 | ||
124 | return $zone if $zoneinfo->{$zone}; | |
125 | ||
126 | my $ext_zone = "z${bridge}ext"; | |
127 | ||
128 | $zoneinfo->{$zone} = { | |
129 | type => 'bridge', | |
130 | bridge => $bridge, | |
131 | bridge_ext_zone => $ext_zone, | |
132 | }; | |
133 | ||
134 | # physical input devices | |
135 | my $dir = "/sys/class/net/$bridge/brif"; | |
136 | my $physical = {}; | |
137 | PVE::Tools::dir_glob_foreach($dir, '((eth|bond).+)', sub { | |
138 | my ($slave) = @_; | |
139 | $physical->{$slave} = 1; | |
140 | }); | |
141 | ||
142 | $zoneinfo->{$ext_zone} = { | |
143 | type => 'bport', | |
144 | bridge_zone => $zone, | |
145 | ifaces => $physical, | |
146 | }; | |
147 | ||
148 | return &$register_bridge("${bridge}v${vlan}") if defined($vlan); | |
149 | ||
150 | return $zone; | |
151 | }; | |
152 | ||
153 | my $register_bridge_port = sub { | |
154 | my ($bridge, $vlan, $vmzone, $tap) = @_; | |
155 | ||
156 | my $bridge_zone = &$register_bridge($bridge, $vlan); | |
157 | my $zone = $bridge_zone . $vmzone; | |
158 | ||
159 | if (!$zoneinfo->{$zone}) { | |
160 | $zoneinfo->{$zone} = { | |
161 | type => 'bport', | |
162 | bridge_zone => $bridge_zone, | |
163 | ifaces => {}, | |
164 | }; | |
165 | } | |
166 | ||
167 | $zoneinfo->{$zone}->{ifaces}->{$tap} = 1; | |
168 | ||
169 | return $zone; | |
170 | }; | |
171 | ||
172 | foreach my $vmid (keys %{$vmdata->{qemu}}) { | |
173 | $netinfo->{$vmid} = {}; | |
174 | my $conf = $vmdata->{qemu}->{$vmid}; | |
175 | foreach my $opt (keys %$conf) { | |
176 | next if $opt !~ m/^net(\d+)$/; | |
177 | my $netnum = $1; | |
178 | my $net = PVE::QemuServer::parse_net($conf->{$opt}); | |
179 | next if !$net; | |
180 | die "implement me" if !$net->{bridge}; | |
181 | ||
182 | my $vmzone = $conf->{zone} || "vm$vmid"; | |
183 | $net->{tap} = "tap${vmid}i${netnum}"; | |
184 | $maclist->{$net->{tap}} = $net->{macaddr} || die "internal error"; | |
185 | $net->{zone} = &$register_bridge_port($net->{bridge}, $net->{tag}, $vmzone, $net->{tap}); | |
186 | $netinfo->{$vmid}->{$opt} = $net; | |
187 | } | |
188 | } | |
189 | ||
190 | #print Dumper($netinfo); | |
191 | ||
192 | # NOTE: zone names have length limit, so we need to | |
193 | # translate them into shorter names | |
194 | ||
195 | my $zoneid = 0; | |
196 | my $zonemap = { fw => 'fw' }; | |
197 | ||
198 | my $lookup_zonename = sub { | |
199 | my ($zone) = @_; | |
200 | ||
201 | return $zonemap->{$zone} if defined($zonemap->{$zone}); | |
202 | $zonemap->{$zone} = 'z' . $zoneid++; | |
203 | ||
204 | return $zonemap->{$zone}; | |
205 | }; | |
206 | ||
207 | foreach my $z (sort keys %$zoneinfo) { | |
208 | $zoneinfo->{$z}->{id} = &$lookup_zonename($z); | |
209 | $zoneinfo->{$z}->{zonevar} = uc($z); | |
210 | $zoneinfo->{$z}->{zoneref} = '$' . $zoneinfo->{$z}->{zonevar}; | |
211 | } | |
212 | ||
213 | my $out; | |
214 | ||
215 | # dump params file | |
216 | $out = "# PVE zones\n"; | |
217 | foreach my $z (sort keys %$zoneinfo) { | |
218 | $out .= "$zoneinfo->{$z}->{zonevar}=$zoneinfo->{$z}->{id}\n"; | |
219 | } | |
220 | PVE::Tools::file_set_contents("$targetdir/params", $out); | |
221 | ||
222 | # dump zone file | |
223 | ||
224 | my $format = "%-30s %-10s %-15s\n"; | |
225 | $out = sprintf($format, '#ZONE', 'TYPE', 'OPTIONS'); | |
226 | ||
227 | foreach my $z (sort keys %$zoneinfo) { | |
228 | my $zid = $zoneinfo->{$z}->{zoneref}; | |
229 | if ($zoneinfo->{$z}->{type} eq 'firewall') { | |
230 | $out .= sprintf($format, $zid, $zoneinfo->{$z}->{type}, ''); | |
231 | } elsif ($zoneinfo->{$z}->{type} eq 'bridge') { | |
232 | $out .= sprintf($format, $zid, 'ipv4', ''); | |
233 | } elsif ($zoneinfo->{$z}->{type} eq 'bport') { | |
234 | my $bridge_zone = $zoneinfo->{$z}->{bridge_zone} || die "internal error"; | |
235 | my $bzid = $zoneinfo->{$bridge_zone}->{zoneref} || die "internal error"; | |
236 | $out .= sprintf($format, "$zid:$bzid", 'bport', ''); | |
237 | } else { | |
238 | die "internal error"; | |
239 | } | |
240 | } | |
241 | ||
242 | $out .= sprintf("#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE\n"); | |
243 | ||
244 | PVE::Tools::file_set_contents("$targetdir/zones", $out); | |
245 | ||
246 | # dump interfaces | |
247 | ||
248 | $format = "%-25s %-20s %-10s %-15s\n"; | |
249 | $out = sprintf($format, '#ZONE', 'INTERFACE', 'BROADCAST', 'OPTIONS'); | |
250 | ||
251 | my $maclist_format = "%-15s %-15s %-15s\n"; | |
252 | my $macs = sprintf($maclist_format, '#DISPOSITION', 'INTERFACE', 'MACZONE'); | |
253 | ||
254 | foreach my $z (sort keys %$zoneinfo) { | |
255 | my $zid = $zoneinfo->{$z}->{zoneref}; | |
256 | if ($zoneinfo->{$z}->{type} eq 'firewall') { | |
257 | # do nothing; | |
258 | } elsif ($zoneinfo->{$z}->{type} eq 'bridge') { | |
259 | my $bridge = $zoneinfo->{$z}->{bridge} || die "internal error"; | |
260 | $out .= sprintf($format, $zid, $bridge, 'detect', 'bridge,optional'); | |
261 | } elsif ($zoneinfo->{$z}->{type} eq 'bport') { | |
262 | my $ifaces = $zoneinfo->{$z}->{ifaces}; | |
263 | foreach my $iface (sort keys %$ifaces) { | |
264 | my $bridge_zone = $zoneinfo->{$z}->{bridge_zone} || die "internal error"; | |
265 | my $bridge = $zoneinfo->{$bridge_zone}->{bridge} || die "internal error"; | |
266 | my $iftxt = "$bridge:$iface"; | |
267 | ||
268 | if ($maclist->{$iface}) { | |
269 | $out .= sprintf($format, $zid, $iftxt, '-', 'maclist'); | |
270 | $macs .= sprintf($maclist_format, 'ACCEPT', $iface, $maclist->{$iface}); | |
271 | } else { | |
272 | $out .= sprintf($format, $zid, $iftxt, '-', ''); | |
273 | } | |
274 | } | |
275 | } else { | |
276 | die "internal error"; | |
277 | } | |
278 | } | |
279 | ||
280 | $out .= sprintf("#LAST LINE - ADD YOUR ENTRIES ABOVE THIS ONE - DO NOT REMOVE\n"); | |
281 | ||
282 | PVE::Tools::file_set_contents("$targetdir/interfaces", $out); | |
283 | ||
284 | # dump maclist | |
285 | PVE::Tools::file_set_contents("$targetdir/maclist", $macs); | |
286 | ||
287 | # dump policy | |
288 | ||
289 | $format = "%-15s %-15s %-15s %s\n"; | |
290 | $out = sprintf($format, '#SOURCE', 'DEST', 'POLICY', 'LOG'); | |
291 | $out .= sprintf($format, 'fw', 'all', 'ACCEPT', ''); | |
292 | ||
293 | # we need to disable intra-zone traffic on bridges. Else traffic | |
294 | # from untracked interfaces simply pass the firewall | |
295 | foreach my $z (sort keys %$zoneinfo) { | |
296 | my $zid = $zoneinfo->{$z}->{zoneref}; | |
297 | if ($zoneinfo->{$z}->{type} eq 'bridge') { | |
298 | $out .= sprintf($format, $zid, $zid, 'REJECT', 'info'); | |
299 | } | |
300 | } | |
301 | $out .= sprintf($format, 'all', 'all', 'REJECT', 'info'); | |
302 | ||
303 | PVE::Tools::file_set_contents("$targetdir/policy", $out); | |
304 | ||
305 | # dump rules | |
306 | $out = ''; | |
307 | ||
308 | $out = sprintf($rule_format, '#ACTION', 'SOURCE', 'DEST', 'PROTO', 'DPORT', 'SPORT'); | |
309 | foreach my $vmid (sort keys %$rules) { | |
310 | my $inrules = $rules->{$vmid}->{in}; | |
311 | my $outrules = $rules->{$vmid}->{out}; | |
312 | ||
313 | if (scalar(@$inrules)) { | |
314 | $out .= "# IN to VM $vmid\n"; | |
315 | foreach my $rule (@$inrules) { | |
316 | foreach my $netid (keys %{$netinfo->{$vmid}}) { | |
317 | my $net = $netinfo->{$vmid}->{$netid}; | |
318 | next if $rule->{iface} && $rule->{iface} ne $netid; | |
319 | $out .= &$generate_input_rule($zoneinfo, $rule, $net, $netid); | |
320 | } | |
321 | } | |
322 | } | |
323 | ||
324 | if (scalar(@$outrules)) { | |
325 | $out .= "# OUT from VM $vmid\n"; | |
326 | foreach my $rule (@$outrules) { | |
327 | foreach my $netid (keys %{$netinfo->{$vmid}}) { | |
328 | my $net = $netinfo->{$vmid}->{$netid}; | |
329 | next if $rule->{iface} && $rule->{iface} ne $netid; | |
330 | $out .= &$generate_output_rule($zoneinfo, $rule, $net, $netid); | |
331 | } | |
332 | } | |
333 | } | |
334 | } | |
335 | ||
336 | PVE::Tools::file_set_contents("$targetdir/rules", $out); | |
337 | }; | |
338 | ||
339 | ||
340 | sub parse_fw_rules { | |
341 | my ($filename, $fh) = @_; | |
342 | ||
343 | my $section; | |
344 | ||
345 | my $res = { in => [], out => [] }; | |
346 | ||
347 | my $macros = PVE::Firewall::get_shorewall_macros(); | |
348 | ||
349 | while (defined(my $line = <$fh>)) { | |
350 | next if $line =~ m/^#/; | |
351 | next if $line =~ m/^\s*$/; | |
352 | ||
353 | if ($line =~ m/^\[(in|out)\]\s*$/i) { | |
354 | $section = lc($1); | |
355 | next; | |
356 | } | |
357 | next if !$section; | |
358 | ||
359 | my ($action, $iface, $source, $dest, $proto, $dport, $sport) = | |
360 | split(/\s+/, $line); | |
361 | ||
362 | if (!$action) { | |
363 | warn "skip incomplete line\n"; | |
364 | next; | |
365 | } | |
366 | ||
367 | my $service; | |
368 | if ($action =~ m/^(ACCEPT|DROP|REJECT)$/) { | |
369 | # OK | |
370 | } elsif ($action =~ m/^(\S+)\((ACCEPT|DROP|REJECT)\)$/) { | |
371 | ($service, $action) = ($1, $2); | |
372 | if (!$macros->{$service}) { | |
373 | warn "unknown service '$service'\n"; | |
374 | next; | |
375 | } | |
376 | } else { | |
377 | warn "unknown action '$action'\n"; | |
378 | next; | |
379 | } | |
380 | ||
381 | $iface = undef if $iface && $iface eq '-'; | |
382 | if ($iface && $iface !~ m/^(net0|net1|net2|net3|net4|net5)$/) { | |
383 | warn "unknown interface '$iface'\n"; | |
384 | next; | |
385 | } | |
386 | ||
387 | $proto = undef if $proto && $proto eq '-'; | |
388 | if ($proto && $proto !~ m/^(icmp|tcp|udp)$/) { | |
389 | warn "unknown protokol '$proto'\n"; | |
390 | next; | |
391 | } | |
392 | ||
393 | $source = undef if $source && $source eq '-'; | |
394 | ||
395 | # if ($source !~ m/^(XYZ)$/) { | |
396 | # warn "unknown source '$source'\n"; | |
397 | # next; | |
398 | # } | |
399 | ||
400 | $dest = undef if $dest && $dest eq '-'; | |
401 | # if ($dest !~ m/^XYZ)$/) { | |
402 | # warn "unknown destination '$dest'\n"; | |
403 | # next; | |
404 | # } | |
405 | ||
406 | $dport = undef if $dport && $dport eq '-'; | |
407 | $sport = undef if $sport && $sport eq '-'; | |
408 | ||
409 | my $rule = { | |
410 | action => $action, | |
411 | service => $service, | |
412 | iface => $iface, | |
413 | source => $source, | |
414 | dest => $dest, | |
415 | proto => $proto, | |
416 | dport => $dport, | |
417 | sport => $sport, | |
418 | }; | |
419 | ||
420 | push @{$res->{$section}}, $rule; | |
421 | } | |
422 | ||
423 | return $res; | |
424 | } | |
425 | ||
426 | sub read_local_vm_config { | |
427 | ||
428 | my $openvz = {}; | |
429 | ||
430 | my $qemu = {}; | |
431 | ||
432 | my $list = PVE::QemuServer::config_list(); | |
433 | ||
434 | foreach my $vmid (keys %$list) { | |
435 | #next if !($vmid eq '100' || $vmid eq '102'); | |
436 | my $cfspath = PVE::QemuServer::cfs_config_path($vmid); | |
437 | if (my $conf = PVE::Cluster::cfs_read_file($cfspath)) { | |
438 | $qemu->{$vmid} = $conf; | |
439 | } | |
440 | } | |
441 | ||
442 | my $vmdata = { openvz => $openvz, qemu => $qemu }; | |
443 | ||
444 | return $vmdata; | |
445 | }; | |
446 | ||
447 | sub read_vm_firewall_rules { | |
448 | my ($vmdata) = @_; | |
449 | my $rules = {}; | |
450 | foreach my $vmid (keys %{$vmdata->{qemu}}, keys %{$vmdata->{openvz}}) { | |
451 | my $filename = "/etc/pve/firewall/$vmid.fw"; | |
452 | my $fh = IO::File->new($filename, O_RDONLY); | |
453 | next if !$fh; | |
454 | ||
455 | $rules->{$vmid} = parse_fw_rules($filename, $fh); | |
456 | } | |
457 | ||
458 | return $rules; | |
459 | } | |
460 | ||
461 | sub compile { | |
462 | ||
463 | my $vmdata = read_local_vm_config(); | |
464 | my $rules = read_vm_firewall_rules($vmdata); | |
465 | ||
466 | # print Dumper($vmdata); | |
467 | ||
468 | my $swdir = '/etc/shorewall'; | |
469 | mkdir $swdir; | |
470 | ||
471 | &$compile_shorewall($swdir, $vmdata, $rules); | |
472 | ||
473 | PVE::Tools::run_command(['shorewall', 'compile']); | |
474 | } | |
475 | ||
476 | sub compile_and_start { | |
477 | my ($restart) = @_; | |
478 | ||
479 | compile(); | |
480 | ||
481 | PVE::Tools::run_command(['shorewall', $restart ? 'restart' : 'start']); | |
482 | } | |
483 | ||
484 | ||
485 | 1; |