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1 | #!/usr/bin/perl -w | |
2 | ############################################################################### | |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5 | # Copyright (C) 2013 Alexander Marx <amarx@ipfire.org> # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | use strict; | |
23 | ||
24 | require '/var/ipfire/general-functions.pl'; | |
25 | require "${General::swroot}/lang.pl"; | |
26 | require "/usr/lib/firewall/firewall-lib.pl"; | |
27 | ||
28 | # Set to one to enable debugging mode. | |
29 | my $DEBUG = 0; | |
30 | ||
31 | my $IPTABLES = "iptables --wait"; | |
32 | ||
33 | # iptables chains | |
34 | my $CHAIN_INPUT = "INPUTFW"; | |
35 | my $CHAIN_FORWARD = "FORWARDFW"; | |
36 | my $CHAIN_OUTPUT = "OUTGOINGFW"; | |
37 | my $CHAIN = $CHAIN_FORWARD; | |
38 | my $CHAIN_NAT_SOURCE = "NAT_SOURCE"; | |
39 | my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION"; | |
40 | my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION"; | |
41 | my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT); | |
42 | my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0"); | |
43 | ||
44 | my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip"); | |
45 | my @PROTOCOLS_WITH_PORTS = ("tcp", "udp"); | |
46 | ||
47 | my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT"); | |
48 | ||
49 | my %fwdfwsettings=(); | |
50 | my %defaultNetworks=(); | |
51 | my %configfwdfw=();; | |
52 | my %customgrp=(); | |
53 | my %configinputfw=(); | |
54 | my %configoutgoingfw=(); | |
55 | my %confignatfw=(); | |
56 | my %aliases=(); | |
57 | my @p2ps=(); | |
58 | ||
59 | my $configfwdfw = "${General::swroot}/firewall/config"; | |
60 | my $configinput = "${General::swroot}/firewall/input"; | |
61 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
62 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
63 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; | |
64 | my $netsettings = "${General::swroot}/ethernet/settings"; | |
65 | ||
66 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); | |
67 | &General::readhash("$netsettings", \%defaultNetworks); | |
68 | &General::readhasharray($configfwdfw, \%configfwdfw); | |
69 | &General::readhasharray($configinput, \%configinputfw); | |
70 | &General::readhasharray($configoutgoing, \%configoutgoingfw); | |
71 | &General::readhasharray($configgrp, \%customgrp); | |
72 | &General::get_aliases(\%aliases); | |
73 | ||
74 | my @log_limit_options = &make_log_limit_options(); | |
75 | ||
76 | # MAIN | |
77 | &main(); | |
78 | ||
79 | sub main { | |
80 | # Flush all chains. | |
81 | &flush(); | |
82 | ||
83 | # Reload firewall rules. | |
84 | &preparerules(); | |
85 | ||
86 | # Load P2P block rules. | |
87 | &p2pblock(); | |
88 | ||
89 | # Reload firewall policy. | |
90 | run("/usr/sbin/firewall-policy"); | |
91 | } | |
92 | ||
93 | sub run { | |
94 | # Executes or prints the given shell command. | |
95 | my $command = shift; | |
96 | ||
97 | if ($DEBUG) { | |
98 | print "$command\n"; | |
99 | } else { | |
100 | system "$command"; | |
101 | ||
102 | if ($?) { | |
103 | print_error("ERROR: $command"); | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | sub print_error { | |
109 | my $message = shift; | |
110 | ||
111 | print STDERR "$message\n"; | |
112 | } | |
113 | ||
114 | sub print_rule { | |
115 | my $hash = shift; | |
116 | ||
117 | print "\nRULE:"; | |
118 | ||
119 | my $i = 0; | |
120 | foreach (@$hash) { | |
121 | printf(" %2d: %s", $i++, $_); | |
122 | } | |
123 | print "\n"; | |
124 | } | |
125 | ||
126 | sub flush { | |
127 | run("$IPTABLES -F $CHAIN_INPUT"); | |
128 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
129 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
130 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
131 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
132 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); | |
133 | } | |
134 | ||
135 | sub preparerules { | |
136 | if (! -z "${General::swroot}/firewall/config"){ | |
137 | &buildrules(\%configfwdfw); | |
138 | } | |
139 | if (! -z "${General::swroot}/firewall/input"){ | |
140 | &buildrules(\%configinputfw); | |
141 | } | |
142 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
143 | &buildrules(\%configoutgoingfw); | |
144 | } | |
145 | } | |
146 | ||
147 | sub buildrules { | |
148 | my $hash = shift; | |
149 | ||
150 | foreach my $key (sort {$a <=> $b} keys %$hash) { | |
151 | # Skip disabled rules. | |
152 | next unless ($$hash{$key}[2] eq 'ON'); | |
153 | ||
154 | if ($DEBUG) { | |
155 | print_rule($$hash{$key}); | |
156 | } | |
157 | ||
158 | # Check if the target is valid. | |
159 | my $target = $$hash{$key}[0]; | |
160 | if (!$target ~~ @VALID_TARGETS) { | |
161 | print_error("Invalid target '$target' for rule $key"); | |
162 | next; | |
163 | } | |
164 | ||
165 | # Check if the chain is valid. | |
166 | my $chain = $$hash{$key}[1]; | |
167 | if (!$chain ~~ @VALID_CHAINS) { | |
168 | print_error("Invalid chain '$chain' in rule $key"); | |
169 | next; | |
170 | } | |
171 | ||
172 | # Collect all sources. | |
173 | my @sources = &fwlib::get_addresses($hash, $key, "src"); | |
174 | ||
175 | # Collect all destinations. | |
176 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); | |
177 | ||
178 | # True if the destination is the firewall itself. | |
179 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
180 | ||
181 | # Check if logging should be enabled. | |
182 | my $LOG = ($$hash{$key}[17] eq 'ON'); | |
183 | ||
184 | # Check if NAT is enabled and initialize variables, that we use for that. | |
185 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
186 | my $NAT_MODE; | |
187 | if ($NAT) { | |
188 | $NAT_MODE = uc($$hash{$key}[31]); | |
189 | } | |
190 | ||
191 | # Set up time constraints. | |
192 | my @time_options = (); | |
193 | if ($$hash{$key}[18] eq 'ON') { | |
194 | push(@time_options, ("-m", "time")); | |
195 | ||
196 | # Select all days of the week this match is active. | |
197 | my @weekdays = (); | |
198 | if ($$hash{$key}[19] ne '') { | |
199 | push (@weekdays, "Mon"); | |
200 | } | |
201 | if ($$hash{$key}[20] ne '') { | |
202 | push (@weekdays, "Tue"); | |
203 | } | |
204 | if ($$hash{$key}[21] ne '') { | |
205 | push (@weekdays, "Wed"); | |
206 | } | |
207 | if ($$hash{$key}[22] ne '') { | |
208 | push (@weekdays, "Thu"); | |
209 | } | |
210 | if ($$hash{$key}[23] ne '') { | |
211 | push (@weekdays, "Fri"); | |
212 | } | |
213 | if ($$hash{$key}[24] ne '') { | |
214 | push (@weekdays, "Sat"); | |
215 | } | |
216 | if ($$hash{$key}[25] ne '') { | |
217 | push (@weekdays, "Sun"); | |
218 | } | |
219 | if (@weekdays) { | |
220 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
221 | } | |
222 | ||
223 | # Convert start time. | |
224 | my $time_start = &format_time($$hash{$key}[26]); | |
225 | if ($time_start) { | |
226 | push(@time_options, ("--timestart", $time_start)); | |
227 | } | |
228 | ||
229 | # Convert end time. | |
230 | my $time_stop = &format_time($$hash{$key}[27]); | |
231 | if ($time_stop) { | |
232 | push(@time_options, ("--timestop", $time_stop)); | |
233 | } | |
234 | } | |
235 | ||
236 | # Check which protocols are used in this rule and so that we can | |
237 | # later group rules by protocols. | |
238 | my @protocols = &get_protocols($hash, $key); | |
239 | if (!@protocols) { | |
240 | print_error("Invalid protocol configuration for rule $key"); | |
241 | next; | |
242 | } | |
243 | ||
244 | foreach my $protocol (@protocols) { | |
245 | # Check if the given protocol is supported. | |
246 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
247 | print_error("Protocol $protocol is not supported (rule $key)"); | |
248 | next; | |
249 | } | |
250 | ||
251 | # Prepare protocol options (like ICMP types, ports, etc...). | |
252 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); | |
253 | ||
254 | # Check if this protocol knows ports. | |
255 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
256 | ||
257 | foreach my $src (@sources) { | |
258 | # Skip invalid source. | |
259 | next unless ($src); | |
260 | ||
261 | # Sanitize source. | |
262 | my $source = $src; | |
263 | if ($source ~~ @ANY_ADDRESSES) { | |
264 | $source = ""; | |
265 | } | |
266 | ||
267 | foreach my $dst (@destinations) { | |
268 | # Skip invalid rules. | |
269 | next if (!$dst || ($dst eq "none")); | |
270 | ||
271 | # Sanitize destination. | |
272 | my $destination = $dst; | |
273 | if ($destination ~~ @ANY_ADDRESSES) { | |
274 | $destination = ""; | |
275 | } | |
276 | ||
277 | # Array with iptables arguments. | |
278 | my @options = (); | |
279 | ||
280 | # Append protocol. | |
281 | if ($protocol ne "all") { | |
282 | push(@options, @protocol_options); | |
283 | } | |
284 | ||
285 | # Prepare source options. | |
286 | my @source_options = (); | |
287 | if ($source =~ /mac/) { | |
288 | push(@source_options, $source); | |
289 | } elsif ($source) { | |
290 | push(@source_options, ("-s", $source)); | |
291 | } | |
292 | ||
293 | # Prepare destination options. | |
294 | my @destination_options = (); | |
295 | if ($destination) { | |
296 | push(@destination_options, ("-d", $destination)); | |
297 | } | |
298 | ||
299 | # Add time constraint options. | |
300 | push(@options, @time_options); | |
301 | ||
302 | my $firewall_is_in_source_subnet = 0; | |
303 | if ($source) { | |
304 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); | |
305 | } | |
306 | ||
307 | # Process NAT rules. | |
308 | if ($NAT) { | |
309 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); | |
310 | ||
311 | # Skip NAT rules if the NAT address is unknown | |
312 | # (i.e. no internet connection has been established, yet). | |
313 | next unless ($nat_address); | |
314 | ||
315 | # Destination NAT | |
316 | if ($NAT_MODE eq "DNAT") { | |
317 | # Make port-forwardings useable from the internal networks. | |
318 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
319 | unless ($nat_address ~~ @internal_addresses) { | |
320 | &add_dnat_mangle_rules($nat_address, @options); | |
321 | } | |
322 | ||
323 | my @nat_options = (); | |
324 | if ($protocol ne "all") { | |
325 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
326 | push(@nat_options, @nat_protocol_options); | |
327 | } | |
328 | push(@nat_options, @source_options); | |
329 | push(@nat_options, ("-d", $nat_address)); | |
330 | push(@nat_options, @time_options); | |
331 | ||
332 | my $dnat_port; | |
333 | if ($protocol_has_ports) { | |
334 | $dnat_port = &get_dnat_target_port($hash, $key); | |
335 | } | |
336 | ||
337 | my @nat_action_options = (); | |
338 | ||
339 | # Use iptables REDIRECT | |
340 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port); | |
341 | if ($use_redirect) { | |
342 | push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port)); | |
343 | ||
344 | # Use iptables DNAT | |
345 | } else { | |
346 | if ($destination_is_firewall && !$destination) { | |
347 | $destination = &fwlib::get_external_address(); | |
348 | } | |
349 | next unless ($destination); | |
350 | ||
351 | my ($dnat_address, $dnat_mask) = split("/", $destination); | |
352 | @destination_options = ("-d", $dnat_address); | |
353 | ||
354 | if ($protocol_has_ports) { | |
355 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
356 | ||
357 | if ($dnat_port) { | |
358 | $dnat_address .= ":$dnat_port"; | |
359 | } | |
360 | } | |
361 | ||
362 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
363 | } | |
364 | ||
365 | if ($LOG) { | |
366 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); | |
367 | } | |
368 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); | |
369 | ||
370 | # Source NAT | |
371 | } elsif ($NAT_MODE eq "SNAT") { | |
372 | my @nat_options = @options; | |
373 | ||
374 | push(@nat_options, @source_options); | |
375 | push(@nat_options, @destination_options); | |
376 | ||
377 | if ($LOG) { | |
378 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); | |
379 | } | |
380 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address"); | |
381 | } | |
382 | } | |
383 | ||
384 | push(@options, @source_options); | |
385 | ||
386 | if ($firewall_is_in_source_subnet && ($fwdfwsettings{"POLICY"} eq "MODE1") && ($chain eq $CHAIN_FORWARD)) { | |
387 | if ($LOG && !$NAT) { | |
388 | run("$IPTABLES -A $CHAIN_INPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); | |
389 | } | |
390 | run("$IPTABLES -A $CHAIN_INPUT @options -j $target"); | |
391 | } | |
392 | ||
393 | push(@options, @destination_options); | |
394 | ||
395 | # Insert firewall rule. | |
396 | if ($LOG && !$NAT) { | |
397 | run("$IPTABLES -A $chain @options @log_limit_options -j LOG --log-prefix '$chain '"); | |
398 | } | |
399 | run("$IPTABLES -A $chain @options -j $target"); | |
400 | } | |
401 | } | |
402 | } | |
403 | } | |
404 | } | |
405 | ||
406 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. | |
407 | sub format_time { | |
408 | my $val = shift; | |
409 | ||
410 | # Convert the given time into minutes. | |
411 | my $minutes = &time_convert_to_minutes($val); | |
412 | ||
413 | # Move the timestamp into UTC. | |
414 | $minutes += &time_utc_offset(); | |
415 | ||
416 | # Make sure $minutes is between 00:00 and 23:59. | |
417 | if ($minutes < 0) { | |
418 | $minutes += 1440; | |
419 | } | |
420 | ||
421 | if ($minutes > 1440) { | |
422 | $minutes -= 1440; | |
423 | } | |
424 | ||
425 | # Format as hh:mm. | |
426 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
427 | } | |
428 | ||
429 | # Calculates the offsets in minutes from the local timezone to UTC. | |
430 | sub time_utc_offset { | |
431 | my @localtime = localtime(time); | |
432 | my @gmtime = gmtime(time); | |
433 | ||
434 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
435 | } | |
436 | ||
437 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. | |
438 | sub time_convert_to_minutes { | |
439 | my ($hrs, $min) = split(":", shift); | |
440 | ||
441 | return ($hrs * 60) + $min; | |
442 | } | |
443 | ||
444 | sub p2pblock { | |
445 | my $P2PSTRING = ""; | |
446 | my $DO; | |
447 | open( FILE, "< $p2pfile" ) or die "Unable to read $p2pfile"; | |
448 | @p2ps = <FILE>; | |
449 | close FILE; | |
450 | my $CMD = "-m ipp2p"; | |
451 | foreach my $p2pentry (sort @p2ps) { | |
452 | my @p2pline = split( /\;/, $p2pentry ); | |
453 | if ( $fwdfwsettings{'POLICY'} eq 'MODE1' ) { | |
454 | $DO = "ACCEPT"; | |
455 | if ("$p2pline[2]" eq "on") { | |
456 | $P2PSTRING = "$P2PSTRING --$p2pline[1]"; | |
457 | } | |
458 | }else { | |
459 | $DO = "RETURN"; | |
460 | if ("$p2pline[2]" eq "off") { | |
461 | $P2PSTRING = "$P2PSTRING --$p2pline[1]"; | |
462 | } | |
463 | } | |
464 | } | |
465 | ||
466 | if($P2PSTRING) { | |
467 | run("$IPTABLES -A FORWARDFW $CMD $P2PSTRING -j $DO"); | |
468 | } | |
469 | } | |
470 | ||
471 | sub get_protocols { | |
472 | my $hash = shift; | |
473 | my $key = shift; | |
474 | ||
475 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
476 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
477 | ||
478 | my @protocols = (); | |
479 | ||
480 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
481 | if (!$uses_source_ports && !$uses_services) { | |
482 | push(@protocols, $$hash{$key}[8]); | |
483 | ||
484 | # Rules which either use ports or services. | |
485 | } elsif ($uses_source_ports || $uses_services) { | |
486 | # Check if service group or service | |
487 | if ($$hash{$key}[14] eq 'cust_srv') { | |
488 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
489 | ||
490 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
491 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
492 | push(@protocols, split(",", $protos)); | |
493 | ||
494 | } else { | |
495 | # Fetch the protocol for this rule. | |
496 | my $protocol = lc($$hash{$key}[8]); | |
497 | ||
498 | # Fetch source and destination ports for this rule. | |
499 | my $source_ports = $$hash{$key}[10]; | |
500 | my $destination_ports = $$hash{$key}[15]; | |
501 | ||
502 | # Check if ports are set for protocols which do not support ports. | |
503 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
504 | print_error("$protocol does not support ports"); | |
505 | return (); | |
506 | } | |
507 | ||
508 | push(@protocols, $protocol); | |
509 | } | |
510 | } | |
511 | ||
512 | # Remove all empty elements | |
513 | @protocols = map { $_ ? $_ : () } @protocols; | |
514 | ||
515 | # If no protocol has been defined, we assume "all". | |
516 | if (!@protocols) { | |
517 | push(@protocols, "all"); | |
518 | } | |
519 | ||
520 | # Make all protocol names lowercase. | |
521 | @protocols = map { lc } @protocols; | |
522 | ||
523 | return @protocols; | |
524 | } | |
525 | ||
526 | sub get_protocol_options { | |
527 | my $hash = shift; | |
528 | my $key = shift; | |
529 | my $protocol = shift; | |
530 | my $nat_options_wanted = shift; | |
531 | my @options = (); | |
532 | ||
533 | # Nothing to do if no protocol is specified. | |
534 | if ($protocol eq "all") { | |
535 | return @options; | |
536 | } else { | |
537 | push(@options, ("-p", $protocol)); | |
538 | } | |
539 | ||
540 | # Process source ports. | |
541 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
542 | my $src_ports = $$hash{$key}[10]; | |
543 | ||
544 | if ($use_src_ports && $src_ports) { | |
545 | push(@options, &format_ports($src_ports, "src")); | |
546 | } | |
547 | ||
548 | # Process destination ports. | |
549 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
550 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
551 | ||
552 | if ($use_dst_ports) { | |
553 | my $dst_ports_mode = $$hash{$key}[14]; | |
554 | my $dst_ports = $$hash{$key}[15]; | |
555 | ||
556 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { | |
557 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
558 | $dst_ports = $$hash{$key}[30]; | |
559 | } | |
560 | push(@options, &format_ports($dst_ports, "dst")); | |
561 | ||
562 | } elsif ($dst_ports_mode eq "cust_srv") { | |
563 | if ($protocol eq "ICMP") { | |
564 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
565 | } else { | |
566 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
567 | push(@options, &format_ports($dst_ports, "dst")); | |
568 | } | |
569 | ||
570 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
571 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
572 | } | |
573 | } | |
574 | ||
575 | # Check if a single ICMP type is selected. | |
576 | if (!$use_src_ports && !$use_dst_ports && $protocol eq "icmp") { | |
577 | my $icmp_type = $$hash{$key}[9]; | |
578 | ||
579 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
580 | push(@options, ("--icmp-type", $icmp_type)); | |
581 | } | |
582 | } | |
583 | ||
584 | return @options; | |
585 | } | |
586 | ||
587 | sub format_ports { | |
588 | my $ports = shift; | |
589 | my $type = shift; | |
590 | ||
591 | my $arg; | |
592 | if ($type eq "src") { | |
593 | $arg = "--sport"; | |
594 | } elsif ($type eq "dst") { | |
595 | $arg = "--dport"; | |
596 | } | |
597 | ||
598 | my @options = (); | |
599 | ||
600 | if ($ports =~ /\|/) { | |
601 | $ports =~ s/\|/,/g; | |
602 | push(@options, ("-m", "multiport")); | |
603 | } | |
604 | ||
605 | if ($ports) { | |
606 | push(@options, ($arg, $ports)); | |
607 | } | |
608 | ||
609 | return @options; | |
610 | } | |
611 | ||
612 | sub get_dnat_target_port { | |
613 | my $hash = shift; | |
614 | my $key = shift; | |
615 | ||
616 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
617 | my $port = $$hash{$key}[15]; | |
618 | my $external_port = $$hash{$key}[30]; | |
619 | ||
620 | if ($external_port && ($port ne $external_port)) { | |
621 | return $$hash{$key}[15]; | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
626 | sub add_dnat_mangle_rules { | |
627 | my $nat_address = shift; | |
628 | my @options = @_; | |
629 | ||
630 | my $mark = 0; | |
631 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { | |
632 | $mark++; | |
633 | ||
634 | # Skip rule if not all required information exists. | |
635 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
636 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
637 | ||
638 | my @mangle_options = @options; | |
639 | ||
640 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
641 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
642 | ||
643 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
644 | push(@mangle_options, ("-j", "MARK", "--set-mark", $mark)); | |
645 | ||
646 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
647 | } | |
648 | } | |
649 | ||
650 | sub make_log_limit_options { | |
651 | my @options = ("-m", "limit"); | |
652 | ||
653 | # Maybe we should get this from the configuration. | |
654 | my $limit = 10; | |
655 | ||
656 | # We limit log messages to $limit messages per minute. | |
657 | push(@options, ("--limit", "$limit/min")); | |
658 | ||
659 | # And we allow bursts of 2x $limit. | |
660 | push(@options, ("--limit-burst", $limit * 2)); | |
661 | ||
662 | return @options; | |
663 | } | |
664 | ||
665 | sub firewall_is_in_subnet { | |
666 | my $subnet = shift; | |
667 | ||
668 | # ORANGE is missing here, because nothing may ever access | |
669 | # the firewall from this network. | |
670 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); | |
671 | ||
672 | if ($address) { | |
673 | return 1; | |
674 | } | |
675 | ||
676 | return 0; | |
677 | } | |
678 |