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6178953b | 1 | #!/usr/bin/perl -w |
2a81ab0d AM |
2 | ############################################################################### |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
a85a7a60 | 5 | # Copyright (C) 2007-2019 IPFire Team <info@ipfire.org> # |
2a81ab0d AM |
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 | ############################################################################### | |
2a81ab0d | 21 | |
2a81ab0d | 22 | use strict; |
5653e551 | 23 | use experimental 'smartmatch'; |
2a81ab0d | 24 | |
97ab0569 MT |
25 | require '/var/ipfire/general-functions.pl'; |
26 | require "${General::swroot}/lang.pl"; | |
27 | require "/usr/lib/firewall/firewall-lib.pl"; | |
2a81ab0d | 28 | |
68d1eb10 MT |
29 | # Set to one to enable debugging mode. |
30 | my $DEBUG = 0; | |
31 | ||
1f9e7b53 MT |
32 | my $IPTABLES = "iptables --wait"; |
33 | ||
6178953b | 34 | # iptables chains |
8f4f4634 MT |
35 | my $CHAIN_INPUT = "INPUTFW"; |
36 | my $CHAIN_FORWARD = "FORWARDFW"; | |
d98aa95a | 37 | my $CHAIN_OUTPUT = "OUTGOINGFW"; |
8f4f4634 | 38 | my $CHAIN = $CHAIN_FORWARD; |
6178953b MT |
39 | my $CHAIN_NAT_SOURCE = "NAT_SOURCE"; |
40 | my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION"; | |
6e87f0aa | 41 | my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION"; |
8f4f4634 | 42 | my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT); |
c2a1af75 | 43 | my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0"); |
8f4f4634 MT |
44 | |
45 | my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip"); | |
46 | my @PROTOCOLS_WITH_PORTS = ("tcp", "udp"); | |
47 | ||
48 | my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT"); | |
6178953b | 49 | |
2a81ab0d | 50 | my %fwdfwsettings=(); |
aa5f4b65 | 51 | my %fwoptions = (); |
2a81ab0d | 52 | my %defaultNetworks=(); |
8f4f4634 | 53 | my %configfwdfw=();; |
2a81ab0d | 54 | my %customgrp=(); |
2a81ab0d | 55 | my %configinputfw=(); |
5d7faa45 | 56 | my %configoutgoingfw=(); |
a6edca5a | 57 | my %confignatfw=(); |
f5ad4246 SS |
58 | my %geoipsettings = ( |
59 | "GEOIPBLOCK_ENABLED" => "off" | |
60 | ); | |
61 | ||
36196d0d | 62 | my @p2ps=(); |
2a81ab0d | 63 | |
6d8eb5de AM |
64 | my $configfwdfw = "${General::swroot}/firewall/config"; |
65 | my $configinput = "${General::swroot}/firewall/input"; | |
66 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
67 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
211694e5 | 68 | my $geoipfile = "${General::swroot}/firewall/geoipblock"; |
2a81ab0d | 69 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 70 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 71 | |
6d8eb5de | 72 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 73 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 74 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
75 | &General::readhasharray($configfwdfw, \%configfwdfw); |
76 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 77 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 78 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 79 | |
f5ad4246 SS |
80 | # Check if the geoip settings file exists |
81 | if (-e "$geoipfile") { | |
82 | # Read settings file | |
83 | &General::readhash("$geoipfile", \%geoipsettings); | |
84 | } | |
85 | ||
86 | # Get all GeoIP locations. | |
87 | my @locations = &fwlib::get_geoip_locations(); | |
88 | ||
3bb4bb3f MT |
89 | my @log_limit_options = &make_log_limit_options(); |
90 | ||
aa5f4b65 MT |
91 | my $POLICY_INPUT_ALLOWED = 0; |
92 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
93 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
94 | ||
95 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
96 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
97 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
98 | ||
8531b94a MT |
99 | # MAIN |
100 | &main(); | |
101 | ||
102 | sub main { | |
103 | # Flush all chains. | |
104 | &flush(); | |
105 | ||
2d0c7a9f AM |
106 | # Prepare firewall rules. |
107 | if (! -z "${General::swroot}/firewall/input"){ | |
108 | &buildrules(\%configinputfw); | |
109 | } | |
110 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
111 | &buildrules(\%configoutgoingfw); | |
112 | } | |
113 | if (! -z "${General::swroot}/firewall/config"){ | |
114 | &buildrules(\%configfwdfw); | |
115 | } | |
8531b94a MT |
116 | |
117 | # Load P2P block rules. | |
118 | &p2pblock(); | |
119 | ||
211694e5 SS |
120 | # Load GeoIP block rules. |
121 | &geoipblock(); | |
122 | ||
8531b94a MT |
123 | # Reload firewall policy. |
124 | run("/usr/sbin/firewall-policy"); | |
2d0c7a9f AM |
125 | |
126 | #Reload firewall.local if present | |
127 | if ( -f '/etc/sysconfig/firewall.local'){ | |
128 | run("/etc/sysconfig/firewall.local reload"); | |
129 | } | |
2a81ab0d | 130 | } |
97ab0569 | 131 | |
68d1eb10 MT |
132 | sub run { |
133 | # Executes or prints the given shell command. | |
134 | my $command = shift; | |
135 | ||
136 | if ($DEBUG) { | |
137 | print "$command\n"; | |
138 | } else { | |
139 | system "$command"; | |
6e87f0aa MT |
140 | |
141 | if ($?) { | |
142 | print_error("ERROR: $command"); | |
143 | } | |
68d1eb10 MT |
144 | } |
145 | } | |
146 | ||
6178953b MT |
147 | sub print_error { |
148 | my $message = shift; | |
149 | ||
150 | print STDERR "$message\n"; | |
151 | } | |
152 | ||
8f4f4634 MT |
153 | sub print_rule { |
154 | my $hash = shift; | |
155 | ||
156 | print "\nRULE:"; | |
157 | ||
158 | my $i = 0; | |
159 | foreach (@$hash) { | |
160 | printf(" %2d: %s", $i++, $_); | |
161 | } | |
162 | print "\n"; | |
163 | } | |
164 | ||
791c2b45 MT |
165 | sub count_elements { |
166 | my $hash = shift; | |
167 | ||
168 | return scalar @$hash; | |
169 | } | |
170 | ||
97ab0569 | 171 | sub flush { |
d98aa95a MT |
172 | run("$IPTABLES -F $CHAIN_INPUT"); |
173 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
174 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
175 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
176 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 177 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
86a921ee | 178 | } |
97ab0569 | 179 | |
97ab0569 | 180 | sub buildrules { |
8f4f4634 MT |
181 | my $hash = shift; |
182 | ||
aa5f4b65 MT |
183 | # Search for targets that need to be specially handled when adding |
184 | # forwarding rules. Additional rules will automatically get inserted | |
185 | # into the INPUT/OUTPUT chains for these targets. | |
186 | my @special_input_targets = (); | |
187 | if (!$POLICY_FORWARD_ALLOWED) { | |
188 | push(@special_input_targets, "ACCEPT"); | |
189 | } | |
190 | ||
191 | if ($POLICY_INPUT_ACTION eq "DROP") { | |
ae93dd3d | 192 | push(@special_input_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 193 | } elsif ($POLICY_INPUT_ACTION eq "REJECT") { |
ae93dd3d | 194 | push(@special_input_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
195 | } |
196 | ||
197 | my @special_output_targets = (); | |
198 | if ($POLICY_OUTPUT_ALLOWED) { | |
199 | push(@special_output_targets, ("DROP", "REJECT")); | |
200 | } else { | |
201 | push(@special_output_targets, "ACCEPT"); | |
202 | ||
203 | if ($POLICY_OUTPUT_ACTION eq "DROP") { | |
ae93dd3d | 204 | push(@special_output_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 205 | } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") { |
ae93dd3d | 206 | push(@special_output_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
207 | } |
208 | } | |
209 | ||
8f4f4634 MT |
210 | foreach my $key (sort {$a <=> $b} keys %$hash) { |
211 | # Skip disabled rules. | |
212 | next unless ($$hash{$key}[2] eq 'ON'); | |
213 | ||
791c2b45 MT |
214 | # Count number of elements in this line |
215 | my $elements = &count_elements($$hash{$key}); | |
216 | ||
8f4f4634 MT |
217 | if ($DEBUG) { |
218 | print_rule($$hash{$key}); | |
219 | } | |
220 | ||
221 | # Check if the target is valid. | |
222 | my $target = $$hash{$key}[0]; | |
223 | if (!$target ~~ @VALID_TARGETS) { | |
224 | print_error("Invalid target '$target' for rule $key"); | |
225 | next; | |
226 | } | |
227 | ||
228 | # Check if the chain is valid. | |
229 | my $chain = $$hash{$key}[1]; | |
230 | if (!$chain ~~ @VALID_CHAINS) { | |
231 | print_error("Invalid chain '$chain' in rule $key"); | |
232 | next; | |
233 | } | |
234 | ||
235 | # Collect all sources. | |
4e54e3c6 | 236 | my @sources = &fwlib::get_addresses($hash, $key, "src"); |
8f4f4634 MT |
237 | |
238 | # Collect all destinations. | |
4e54e3c6 | 239 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); |
6178953b | 240 | |
c0ce9206 MT |
241 | # True if the destination is the firewall itself. |
242 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
243 | ||
6178953b | 244 | # Check if logging should be enabled. |
8f4f4634 | 245 | my $LOG = ($$hash{$key}[17] eq 'ON'); |
6178953b | 246 | |
8f4f4634 MT |
247 | # Check if NAT is enabled and initialize variables, that we use for that. |
248 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
6178953b | 249 | my $NAT_MODE; |
8f4f4634 MT |
250 | if ($NAT) { |
251 | $NAT_MODE = uc($$hash{$key}[31]); | |
252 | } | |
6178953b | 253 | |
8f4f4634 MT |
254 | # Set up time constraints. |
255 | my @time_options = (); | |
256 | if ($$hash{$key}[18] eq 'ON') { | |
257 | push(@time_options, ("-m", "time")); | |
6178953b | 258 | |
8f4f4634 MT |
259 | # Select all days of the week this match is active. |
260 | my @weekdays = (); | |
261 | if ($$hash{$key}[19] ne '') { | |
262 | push (@weekdays, "Mon"); | |
263 | } | |
264 | if ($$hash{$key}[20] ne '') { | |
265 | push (@weekdays, "Tue"); | |
266 | } | |
267 | if ($$hash{$key}[21] ne '') { | |
268 | push (@weekdays, "Wed"); | |
269 | } | |
270 | if ($$hash{$key}[22] ne '') { | |
271 | push (@weekdays, "Thu"); | |
272 | } | |
273 | if ($$hash{$key}[23] ne '') { | |
274 | push (@weekdays, "Fri"); | |
275 | } | |
276 | if ($$hash{$key}[24] ne '') { | |
277 | push (@weekdays, "Sat"); | |
278 | } | |
279 | if ($$hash{$key}[25] ne '') { | |
280 | push (@weekdays, "Sun"); | |
281 | } | |
282 | if (@weekdays) { | |
283 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
284 | } | |
6178953b | 285 | |
8f4f4634 MT |
286 | # Convert start time. |
287 | my $time_start = &format_time($$hash{$key}[26]); | |
288 | if ($time_start) { | |
289 | push(@time_options, ("--timestart", $time_start)); | |
a6edca5a | 290 | } |
6178953b | 291 | |
8f4f4634 MT |
292 | # Convert end time. |
293 | my $time_stop = &format_time($$hash{$key}[27]); | |
294 | if ($time_stop) { | |
295 | push(@time_options, ("--timestop", $time_stop)); | |
296 | } | |
a6edca5a | 297 | } |
6178953b | 298 | |
d2793ea8 AM |
299 | # Concurrent connection limit |
300 | my @ratelimit_options = (); | |
791c2b45 | 301 | |
d840d02a | 302 | if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) { |
d2793ea8 AM |
303 | my $conn_limit = $$hash{$key}[33]; |
304 | ||
305 | if ($conn_limit ge 1) { | |
306 | push(@ratelimit_options, ("-m", "connlimit")); | |
307 | ||
308 | # Use the the entire source IP address | |
309 | push(@ratelimit_options, "--connlimit-saddr"); | |
310 | push(@ratelimit_options, ("--connlimit-mask", "32")); | |
311 | ||
312 | # Apply the limit | |
313 | push(@ratelimit_options, ("--connlimit-upto", $conn_limit)); | |
314 | } | |
315 | } | |
316 | ||
317 | # Ratelimit | |
d840d02a | 318 | if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) { |
d2793ea8 AM |
319 | my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]"; |
320 | ||
d840d02a MT |
321 | if ($rate_limit) { |
322 | push(@ratelimit_options, ("-m", "limit")); | |
323 | push(@ratelimit_options, ("--limit", $rate_limit)); | |
324 | } | |
d2793ea8 AM |
325 | } |
326 | ||
8f4f4634 MT |
327 | # Check which protocols are used in this rule and so that we can |
328 | # later group rules by protocols. | |
329 | my @protocols = &get_protocols($hash, $key); | |
330 | if (!@protocols) { | |
331 | print_error("Invalid protocol configuration for rule $key"); | |
332 | next; | |
333 | } | |
334 | ||
335 | foreach my $protocol (@protocols) { | |
336 | # Check if the given protocol is supported. | |
337 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
338 | print_error("Protocol $protocol is not supported (rule $key)"); | |
339 | next; | |
2a81ab0d | 340 | } |
8f4f4634 MT |
341 | |
342 | # Prepare protocol options (like ICMP types, ports, etc...). | |
d7a14d01 | 343 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); |
8f4f4634 MT |
344 | |
345 | # Check if this protocol knows ports. | |
346 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
347 | ||
02574191 MT |
348 | foreach my $src (@sources) { |
349 | # Skip invalid source. | |
4e9a2b57 | 350 | next unless (defined $src); |
02574191 | 351 | next unless ($src); |
8f4f4634 | 352 | |
02574191 | 353 | # Sanitize source. |
48f07c19 | 354 | my $source = @$src[0]; |
02574191 MT |
355 | if ($source ~~ @ANY_ADDRESSES) { |
356 | $source = ""; | |
357 | } | |
358 | ||
48f07c19 AM |
359 | my $source_intf = @$src[1]; |
360 | ||
02574191 MT |
361 | foreach my $dst (@destinations) { |
362 | # Skip invalid rules. | |
4e9a2b57 | 363 | next unless (defined $dst); |
02574191 | 364 | next if (!$dst || ($dst eq "none")); |
c2a1af75 MT |
365 | |
366 | # Sanitize destination. | |
48f07c19 | 367 | my $destination = @$dst[0]; |
c2a1af75 MT |
368 | if ($destination ~~ @ANY_ADDRESSES) { |
369 | $destination = ""; | |
370 | } | |
371 | ||
48f07c19 AM |
372 | my $destination_intf = @$dst[1]; |
373 | ||
8f4f4634 MT |
374 | # Array with iptables arguments. |
375 | my @options = (); | |
376 | ||
377 | # Append protocol. | |
378 | if ($protocol ne "all") { | |
8f4f4634 | 379 | push(@options, @protocol_options); |
2a81ab0d | 380 | } |
8f4f4634 | 381 | |
6e87f0aa MT |
382 | # Prepare source options. |
383 | my @source_options = (); | |
8f4f4634 | 384 | if ($source =~ /mac/) { |
6e87f0aa | 385 | push(@source_options, $source); |
b9ca2fa6 AM |
386 | } elsif ($source =~ /-m geoip/) { |
387 | push(@source_options, $source); | |
388 | } elsif($source) { | |
6e87f0aa | 389 | push(@source_options, ("-s", $source)); |
2a81ab0d | 390 | } |
14f7cb87 | 391 | |
6e87f0aa | 392 | # Prepare destination options. |
c2a1af75 | 393 | my @destination_options = (); |
b9ca2fa6 AM |
394 | if ($destination =~ /-m geoip/) { |
395 | push(@destination_options, $destination); | |
396 | } elsif ($destination) { | |
c2a1af75 MT |
397 | push(@destination_options, ("-d", $destination)); |
398 | } | |
14f7cb87 | 399 | |
249839b0 MT |
400 | # Add source and destination interface to the filter rules. |
401 | # These are supposed to help filtering forged packets that originate | |
402 | # from BLUE with an IP address from GREEN for instance. | |
403 | my @source_intf_options = (); | |
404 | if ($source_intf) { | |
405 | push(@source_intf_options, ("-i", $source_intf)); | |
406 | } | |
407 | ||
408 | my @destination_intf_options = (); | |
409 | if ($destination_intf) { | |
410 | push(@destination_intf_options, ("-o", $destination_intf)); | |
411 | } | |
412 | ||
8f4f4634 MT |
413 | # Add time constraint options. |
414 | push(@options, @time_options); | |
14f7cb87 | 415 | |
d2793ea8 AM |
416 | # Add ratelimiting option |
417 | push(@options, @ratelimit_options); | |
418 | ||
aa5f4b65 | 419 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 420 | if ($source) { |
da7a2208 | 421 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
422 | } |
423 | ||
aa5f4b65 MT |
424 | my $firewall_is_in_destination_subnet = 1; |
425 | if ($destination) { | |
426 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
427 | } | |
428 | ||
8f4f4634 MT |
429 | # Process NAT rules. |
430 | if ($NAT) { | |
4e54e3c6 | 431 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 432 | |
8f4f4634 MT |
433 | # Skip NAT rules if the NAT address is unknown |
434 | # (i.e. no internet connection has been established, yet). | |
435 | next unless ($nat_address); | |
b05ec50a | 436 | |
8f4f4634 MT |
437 | # Destination NAT |
438 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
439 | my @nat_options = (); |
440 | if ($protocol ne "all") { | |
441 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
442 | push(@nat_options, @nat_protocol_options); | |
443 | } | |
ff7cb6d6 MT |
444 | push(@nat_options, @time_options); |
445 | ||
446 | # Make port-forwardings useable from the internal networks. | |
447 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
448 | unless ($nat_address ~~ @internal_addresses) { | |
48f07c19 | 449 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); |
ff7cb6d6 MT |
450 | } |
451 | ||
6e87f0aa | 452 | push(@nat_options, @source_options); |
8f4f4634 | 453 | push(@nat_options, ("-d", $nat_address)); |
6e87f0aa | 454 | |
c0ce9206 | 455 | my $dnat_port; |
8f4f4634 | 456 | if ($protocol_has_ports) { |
c0ce9206 MT |
457 | $dnat_port = &get_dnat_target_port($hash, $key); |
458 | } | |
459 | ||
460 | my @nat_action_options = (); | |
b05ec50a | 461 | |
c0ce9206 MT |
462 | # Use iptables REDIRECT |
463 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port); | |
464 | if ($use_redirect) { | |
465 | push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port)); | |
466 | ||
467 | # Use iptables DNAT | |
468 | } else { | |
f98bb538 MT |
469 | if ($destination_is_firewall && !$destination) { |
470 | $destination = &fwlib::get_external_address(); | |
471 | } | |
472 | next unless ($destination); | |
473 | ||
c0ce9206 MT |
474 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
475 | @destination_options = ("-d", $dnat_address); | |
476 | ||
477 | if ($protocol_has_ports) { | |
478 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
479 | ||
480 | if ($dnat_port) { | |
481 | $dnat_address .= ":$dnat_port"; | |
482 | } | |
86a921ee | 483 | } |
c0ce9206 MT |
484 | |
485 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 486 | } |
8f4f4634 MT |
487 | |
488 | if ($LOG) { | |
3bb4bb3f | 489 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 490 | } |
c0ce9206 | 491 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
492 | |
493 | # Source NAT | |
494 | } elsif ($NAT_MODE eq "SNAT") { | |
6e87f0aa MT |
495 | my @nat_options = @options; |
496 | ||
249839b0 | 497 | push(@nat_options, @destination_intf_options); |
6e87f0aa MT |
498 | push(@nat_options, @source_options); |
499 | push(@nat_options, @destination_options); | |
500 | ||
8f4f4634 | 501 | if ($LOG) { |
3bb4bb3f | 502 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 503 | } |
6e87f0aa | 504 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
505 | } |
506 | } | |
8f4f4634 | 507 | |
6e87f0aa MT |
508 | push(@options, @source_options); |
509 | push(@options, @destination_options); | |
510 | ||
8f4f4634 MT |
511 | # Insert firewall rule. |
512 | if ($LOG && !$NAT) { | |
249839b0 | 513 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 | 514 | } |
249839b0 | 515 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target"); |
aa5f4b65 MT |
516 | |
517 | # Handle forwarding rules and add corresponding rules for firewall access. | |
518 | if ($chain eq $CHAIN_FORWARD) { | |
519 | # If the firewall is part of the destination subnet and access to the destination network | |
520 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
521 | # for the firewall, too. | |
522 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
523 | if ($LOG && !$NAT) { | |
249839b0 | 524 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); |
aa5f4b65 | 525 | } |
249839b0 | 526 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target"); |
aa5f4b65 MT |
527 | } |
528 | ||
529 | # Likewise. | |
530 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
531 | if ($LOG && !$NAT) { | |
249839b0 | 532 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); |
aa5f4b65 | 533 | } |
249839b0 | 534 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target"); |
aa5f4b65 MT |
535 | } |
536 | } | |
2a81ab0d AM |
537 | } |
538 | } | |
539 | } | |
2a81ab0d AM |
540 | } |
541 | } | |
97ab0569 | 542 | |
b05ec50a MT |
543 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
544 | sub format_time { | |
545 | my $val = shift; | |
546 | ||
547 | # Convert the given time into minutes. | |
548 | my $minutes = &time_convert_to_minutes($val); | |
549 | ||
550 | # Move the timestamp into UTC. | |
551 | $minutes += &time_utc_offset(); | |
552 | ||
553 | # Make sure $minutes is between 00:00 and 23:59. | |
554 | if ($minutes < 0) { | |
555 | $minutes += 1440; | |
556 | } | |
557 | ||
558 | if ($minutes > 1440) { | |
559 | $minutes -= 1440; | |
560 | } | |
561 | ||
562 | # Format as hh:mm. | |
563 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 564 | } |
97ab0569 | 565 | |
b05ec50a MT |
566 | # Calculates the offsets in minutes from the local timezone to UTC. |
567 | sub time_utc_offset { | |
568 | my @localtime = localtime(time); | |
569 | my @gmtime = gmtime(time); | |
570 | ||
571 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 572 | } |
97ab0569 | 573 | |
b05ec50a MT |
574 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
575 | sub time_convert_to_minutes { | |
576 | my ($hrs, $min) = split(":", shift); | |
577 | ||
578 | return ($hrs * 60) + $min; | |
472136c9 | 579 | } |
97ab0569 MT |
580 | |
581 | sub p2pblock { | |
766c2f60 MT |
582 | open(FILE, "<$p2pfile") or die "Unable to read $p2pfile"; |
583 | my @protocols = (); | |
584 | foreach my $p2pentry (<FILE>) { | |
585 | my @p2pline = split(/\;/, $p2pentry); | |
2a5b19c5 | 586 | next unless ($p2pline[2] eq "off"); |
766c2f60 MT |
587 | |
588 | push(@protocols, "--$p2pline[1]"); | |
36196d0d | 589 | } |
766c2f60 | 590 | close(FILE); |
68d1eb10 | 591 | |
24d36c80 | 592 | run("$IPTABLES -F P2PBLOCK"); |
766c2f60 | 593 | if (@protocols) { |
2a5b19c5 | 594 | run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP"); |
36196d0d AM |
595 | } |
596 | } | |
97ab0569 | 597 | |
211694e5 | 598 | sub geoipblock { |
0505af9d AF |
599 | # Flush iptables chain. |
600 | run("$IPTABLES -F GEOIPBLOCK"); | |
211694e5 | 601 | |
211694e5 SS |
602 | # If geoip blocking is not enabled, we are finished here. |
603 | if ($geoipsettings{'GEOIPBLOCK_ENABLED'} ne "on") { | |
604 | # Exit submodule. Process remaining script. | |
605 | return; | |
606 | } | |
607 | ||
211694e5 SS |
608 | # Loop through all supported geoip locations and |
609 | # create iptables rules, if blocking this country | |
610 | # is enabled. | |
611 | foreach my $location (@locations) { | |
1f912010 | 612 | if(exists $geoipsettings{$location} && $geoipsettings{$location} eq "on") { |
211694e5 SS |
613 | run("$IPTABLES -A GEOIPBLOCK -m geoip --src-cc $location -j DROP"); |
614 | } | |
615 | } | |
616 | } | |
617 | ||
8f4f4634 MT |
618 | sub get_protocols { |
619 | my $hash = shift; | |
620 | my $key = shift; | |
621 | ||
622 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
623 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
624 | ||
625 | my @protocols = (); | |
626 | ||
627 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
628 | if (!$uses_source_ports && !$uses_services) { | |
629 | push(@protocols, $$hash{$key}[8]); | |
630 | ||
631 | # Rules which either use ports or services. | |
632 | } elsif ($uses_source_ports || $uses_services) { | |
633 | # Check if service group or service | |
634 | if ($$hash{$key}[14] eq 'cust_srv') { | |
635 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
636 | ||
637 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
638 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
639 | push(@protocols, split(",", $protos)); | |
640 | ||
641 | } else { | |
642 | # Fetch the protocol for this rule. | |
643 | my $protocol = lc($$hash{$key}[8]); | |
644 | ||
645 | # Fetch source and destination ports for this rule. | |
646 | my $source_ports = $$hash{$key}[10]; | |
647 | my $destination_ports = $$hash{$key}[15]; | |
648 | ||
649 | # Check if ports are set for protocols which do not support ports. | |
650 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
651 | print_error("$protocol does not support ports"); | |
652 | return (); | |
653 | } | |
654 | ||
655 | push(@protocols, $protocol); | |
2a81ab0d AM |
656 | } |
657 | } | |
8f4f4634 MT |
658 | |
659 | # Remove all empty elements | |
660 | @protocols = map { $_ ? $_ : () } @protocols; | |
661 | ||
662 | # If no protocol has been defined, we assume "all". | |
663 | if (!@protocols) { | |
664 | push(@protocols, "all"); | |
98cee89f | 665 | } |
8f4f4634 MT |
666 | |
667 | # Make all protocol names lowercase. | |
668 | @protocols = map { lc } @protocols; | |
669 | ||
670 | return @protocols; | |
2a81ab0d | 671 | } |
97ab0569 | 672 | |
8f4f4634 MT |
673 | sub get_protocol_options { |
674 | my $hash = shift; | |
675 | my $key = shift; | |
676 | my $protocol = shift; | |
d7a14d01 | 677 | my $nat_options_wanted = shift; |
8f4f4634 MT |
678 | my @options = (); |
679 | ||
d7a14d01 MT |
680 | # Nothing to do if no protocol is specified. |
681 | if ($protocol eq "all") { | |
682 | return @options; | |
683 | } else { | |
684 | push(@options, ("-p", $protocol)); | |
685 | } | |
686 | ||
fcc68a42 MT |
687 | if ($protocol ~~ @PROTOCOLS_WITH_PORTS) { |
688 | # Process source ports. | |
689 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
690 | my $src_ports = $$hash{$key}[10]; | |
8f4f4634 | 691 | |
fcc68a42 MT |
692 | if ($use_src_ports && $src_ports) { |
693 | push(@options, &format_ports($src_ports, "src")); | |
694 | } | |
8f4f4634 | 695 | |
fcc68a42 MT |
696 | # Process destination ports. |
697 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
698 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
8f4f4634 | 699 | |
fcc68a42 MT |
700 | if ($use_dst_ports) { |
701 | my $dst_ports_mode = $$hash{$key}[14]; | |
702 | my $dst_ports = $$hash{$key}[15]; | |
8f4f4634 | 703 | |
fcc68a42 MT |
704 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { |
705 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
706 | $dst_ports = $$hash{$key}[30]; | |
707 | } | |
8f4f4634 | 708 | push(@options, &format_ports($dst_ports, "dst")); |
8f4f4634 | 709 | |
fcc68a42 MT |
710 | } elsif ($dst_ports_mode eq "cust_srv") { |
711 | if ($protocol eq "ICMP") { | |
712 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
713 | } else { | |
714 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
715 | push(@options, &format_ports($dst_ports, "dst")); | |
716 | } | |
717 | ||
718 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
719 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
720 | } | |
2a81ab0d AM |
721 | } |
722 | } | |
8f4f4634 MT |
723 | |
724 | # Check if a single ICMP type is selected. | |
fcc68a42 | 725 | if ($protocol eq "icmp") { |
8f4f4634 MT |
726 | my $icmp_type = $$hash{$key}[9]; |
727 | ||
728 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
729 | push(@options, ("--icmp-type", $icmp_type)); | |
a4c7bf6b AM |
730 | } |
731 | } | |
8f4f4634 MT |
732 | |
733 | return @options; | |
734 | } | |
735 | ||
736 | sub format_ports { | |
737 | my $ports = shift; | |
738 | my $type = shift; | |
739 | ||
740 | my $arg; | |
741 | if ($type eq "src") { | |
742 | $arg = "--sport"; | |
743 | } elsif ($type eq "dst") { | |
744 | $arg = "--dport"; | |
745 | } | |
746 | ||
747 | my @options = (); | |
748 | ||
749 | if ($ports =~ /\|/) { | |
750 | $ports =~ s/\|/,/g; | |
751 | push(@options, ("-m", "multiport")); | |
752 | } | |
753 | ||
1c3044d7 MT |
754 | if ($ports) { |
755 | push(@options, ($arg, $ports)); | |
756 | } | |
8f4f4634 MT |
757 | |
758 | return @options; | |
759 | } | |
760 | ||
761 | sub get_dnat_target_port { | |
762 | my $hash = shift; | |
763 | my $key = shift; | |
764 | ||
765 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
1c3044d7 MT |
766 | my $port = $$hash{$key}[15]; |
767 | my $external_port = $$hash{$key}[30]; | |
768 | ||
769 | if ($external_port && ($port ne $external_port)) { | |
770 | return $$hash{$key}[15]; | |
771 | } | |
8f4f4634 | 772 | } |
2a81ab0d | 773 | } |
6e87f0aa MT |
774 | |
775 | sub add_dnat_mangle_rules { | |
776 | my $nat_address = shift; | |
48f07c19 | 777 | my $interface = shift; |
6e87f0aa MT |
778 | my @options = @_; |
779 | ||
780 | my $mark = 0; | |
781 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { | |
782 | $mark++; | |
783 | ||
784 | # Skip rule if not all required information exists. | |
785 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
786 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
787 | ||
48f07c19 AM |
788 | next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"}); |
789 | ||
6e87f0aa MT |
790 | my @mangle_options = @options; |
791 | ||
792 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
793 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
794 | ||
795 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
796 | push(@mangle_options, ("-j", "MARK", "--set-mark", $mark)); | |
797 | ||
798 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
799 | } | |
800 | } | |
3bb4bb3f MT |
801 | |
802 | sub make_log_limit_options { | |
803 | my @options = ("-m", "limit"); | |
804 | ||
805 | # Maybe we should get this from the configuration. | |
806 | my $limit = 10; | |
807 | ||
a85a7a60 | 808 | # We limit log messages to $limit messages per second. |
809 | push(@options, ("--limit", "$limit/second")); | |
3bb4bb3f MT |
810 | |
811 | # And we allow bursts of 2x $limit. | |
812 | push(@options, ("--limit-burst", $limit * 2)); | |
813 | ||
814 | return @options; | |
815 | } | |
e9b5ba41 | 816 | |
da7a2208 MT |
817 | sub firewall_is_in_subnet { |
818 | my $subnet = shift; | |
5cf8c8c1 | 819 | |
e9b5ba41 MT |
820 | # ORANGE is missing here, because nothing may ever access |
821 | # the firewall from this network. | |
4e54e3c6 | 822 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); |
e9b5ba41 | 823 | |
da7a2208 MT |
824 | if ($address) { |
825 | return 1; | |
e9b5ba41 | 826 | } |
da7a2208 MT |
827 | |
828 | return 0; | |
e9b5ba41 | 829 | } |