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6178953b | 1 | #!/usr/bin/perl -w |
2a81ab0d AM |
2 | ############################################################################### |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
2293e1de | 5 | # Copyright (C) 2007-2020 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 "${General::swroot}/lang.pl"; | |
27 | require "/usr/lib/firewall/firewall-lib.pl"; | |
5730a5bc | 28 | require "${General::swroot}/location-functions.pl"; |
2a81ab0d | 29 | |
68d1eb10 MT |
30 | # Set to one to enable debugging mode. |
31 | my $DEBUG = 0; | |
32 | ||
1f9e7b53 | 33 | my $IPTABLES = "iptables --wait"; |
3d886880 | 34 | my $IPSET = "ipset"; |
1f9e7b53 | 35 | |
6178953b | 36 | # iptables chains |
8f4f4634 MT |
37 | my $CHAIN_INPUT = "INPUTFW"; |
38 | my $CHAIN_FORWARD = "FORWARDFW"; | |
d98aa95a | 39 | my $CHAIN_OUTPUT = "OUTGOINGFW"; |
8f4f4634 | 40 | my $CHAIN = $CHAIN_FORWARD; |
6178953b MT |
41 | my $CHAIN_NAT_SOURCE = "NAT_SOURCE"; |
42 | my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION"; | |
6e87f0aa | 43 | my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION"; |
8f4f4634 | 44 | my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT); |
c2a1af75 | 45 | my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0"); |
8f4f4634 MT |
46 | |
47 | my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip"); | |
48 | my @PROTOCOLS_WITH_PORTS = ("tcp", "udp"); | |
49 | ||
50 | my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT"); | |
6178953b | 51 | |
c69c8200 MT |
52 | my @PRIVATE_NETWORKS = ( |
53 | "10.0.0.0/8", | |
54 | "172.16.0.0/12", | |
55 | "192.168.0.0/16", | |
56 | "100.64.0.0/10", | |
57 | ); | |
58 | ||
ce31144c MT |
59 | # MARK masks |
60 | my $NAT_MASK = 0x0f000000; | |
61 | ||
2a81ab0d | 62 | my %fwdfwsettings=(); |
aa5f4b65 | 63 | my %fwoptions = (); |
2a81ab0d | 64 | my %defaultNetworks=(); |
8f4f4634 | 65 | my %configfwdfw=();; |
2a81ab0d | 66 | my %customgrp=(); |
2a81ab0d | 67 | my %configinputfw=(); |
5d7faa45 | 68 | my %configoutgoingfw=(); |
a6edca5a | 69 | my %confignatfw=(); |
5730a5bc SS |
70 | my %locationsettings = ( |
71 | "LOCATIONBLOCK_ENABLED" => "off" | |
f5ad4246 | 72 | ); |
27828969 | 73 | my %loaded_ipset_lists=(); |
f5ad4246 | 74 | |
36196d0d | 75 | my @p2ps=(); |
2a81ab0d | 76 | |
6d8eb5de AM |
77 | my $configfwdfw = "${General::swroot}/firewall/config"; |
78 | my $configinput = "${General::swroot}/firewall/input"; | |
79 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
80 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
5730a5bc | 81 | my $locationfile = "${General::swroot}/firewall/locationblock"; |
2a81ab0d | 82 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 83 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 84 | |
6d8eb5de | 85 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 86 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 87 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
88 | &General::readhasharray($configfwdfw, \%configfwdfw); |
89 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 90 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 91 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 92 | |
5730a5bc SS |
93 | # Check if the location settings file exists |
94 | if (-e "$locationfile") { | |
f5ad4246 | 95 | # Read settings file |
5730a5bc | 96 | &General::readhash("$locationfile", \%locationsettings); |
f5ad4246 SS |
97 | } |
98 | ||
5730a5bc SS |
99 | # Get all available locations. |
100 | my @locations = &Location::Functions::get_locations(); | |
f5ad4246 | 101 | |
3bb4bb3f MT |
102 | my @log_limit_options = &make_log_limit_options(); |
103 | ||
aa5f4b65 MT |
104 | my $POLICY_INPUT_ALLOWED = 0; |
105 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
106 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
107 | ||
108 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
109 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
110 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
111 | ||
8531b94a MT |
112 | # MAIN |
113 | &main(); | |
114 | ||
115 | sub main { | |
116 | # Flush all chains. | |
117 | &flush(); | |
118 | ||
3d886880 SS |
119 | # Destroy all existing ipsets. |
120 | run("$IPSET destroy"); | |
121 | ||
2d0c7a9f AM |
122 | # Prepare firewall rules. |
123 | if (! -z "${General::swroot}/firewall/input"){ | |
124 | &buildrules(\%configinputfw); | |
125 | } | |
126 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
127 | &buildrules(\%configoutgoingfw); | |
128 | } | |
129 | if (! -z "${General::swroot}/firewall/config"){ | |
130 | &buildrules(\%configfwdfw); | |
131 | } | |
8531b94a MT |
132 | |
133 | # Load P2P block rules. | |
134 | &p2pblock(); | |
135 | ||
5730a5bc SS |
136 | # Load Location block rules. |
137 | &locationblock(); | |
211694e5 | 138 | |
8531b94a MT |
139 | # Reload firewall policy. |
140 | run("/usr/sbin/firewall-policy"); | |
2d0c7a9f AM |
141 | |
142 | #Reload firewall.local if present | |
143 | if ( -f '/etc/sysconfig/firewall.local'){ | |
144 | run("/etc/sysconfig/firewall.local reload"); | |
145 | } | |
2a81ab0d | 146 | } |
97ab0569 | 147 | |
68d1eb10 MT |
148 | sub run { |
149 | # Executes or prints the given shell command. | |
150 | my $command = shift; | |
151 | ||
152 | if ($DEBUG) { | |
153 | print "$command\n"; | |
154 | } else { | |
155 | system "$command"; | |
6e87f0aa MT |
156 | |
157 | if ($?) { | |
158 | print_error("ERROR: $command"); | |
159 | } | |
68d1eb10 MT |
160 | } |
161 | } | |
162 | ||
6178953b MT |
163 | sub print_error { |
164 | my $message = shift; | |
165 | ||
166 | print STDERR "$message\n"; | |
167 | } | |
168 | ||
8f4f4634 MT |
169 | sub print_rule { |
170 | my $hash = shift; | |
171 | ||
172 | print "\nRULE:"; | |
173 | ||
174 | my $i = 0; | |
175 | foreach (@$hash) { | |
176 | printf(" %2d: %s", $i++, $_); | |
177 | } | |
178 | print "\n"; | |
179 | } | |
180 | ||
791c2b45 MT |
181 | sub count_elements { |
182 | my $hash = shift; | |
183 | ||
184 | return scalar @$hash; | |
185 | } | |
186 | ||
97ab0569 | 187 | sub flush { |
d98aa95a MT |
188 | run("$IPTABLES -F $CHAIN_INPUT"); |
189 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
190 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
191 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
192 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 193 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
bbeb2a50 SS |
194 | |
195 | # Flush LOCATIONBLOCK chain. | |
196 | run("$IPTABLES -F LOCATIONBLOCK"); | |
86a921ee | 197 | } |
97ab0569 | 198 | |
97ab0569 | 199 | sub buildrules { |
8f4f4634 MT |
200 | my $hash = shift; |
201 | ||
aa5f4b65 MT |
202 | # Search for targets that need to be specially handled when adding |
203 | # forwarding rules. Additional rules will automatically get inserted | |
204 | # into the INPUT/OUTPUT chains for these targets. | |
205 | my @special_input_targets = (); | |
206 | if (!$POLICY_FORWARD_ALLOWED) { | |
207 | push(@special_input_targets, "ACCEPT"); | |
208 | } | |
209 | ||
210 | if ($POLICY_INPUT_ACTION eq "DROP") { | |
ae93dd3d | 211 | push(@special_input_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 212 | } elsif ($POLICY_INPUT_ACTION eq "REJECT") { |
ae93dd3d | 213 | push(@special_input_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
214 | } |
215 | ||
216 | my @special_output_targets = (); | |
217 | if ($POLICY_OUTPUT_ALLOWED) { | |
218 | push(@special_output_targets, ("DROP", "REJECT")); | |
219 | } else { | |
220 | push(@special_output_targets, "ACCEPT"); | |
221 | ||
222 | if ($POLICY_OUTPUT_ACTION eq "DROP") { | |
ae93dd3d | 223 | push(@special_output_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 224 | } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") { |
ae93dd3d | 225 | push(@special_output_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
226 | } |
227 | } | |
228 | ||
8f4f4634 MT |
229 | foreach my $key (sort {$a <=> $b} keys %$hash) { |
230 | # Skip disabled rules. | |
231 | next unless ($$hash{$key}[2] eq 'ON'); | |
232 | ||
791c2b45 MT |
233 | # Count number of elements in this line |
234 | my $elements = &count_elements($$hash{$key}); | |
235 | ||
8f4f4634 MT |
236 | if ($DEBUG) { |
237 | print_rule($$hash{$key}); | |
238 | } | |
239 | ||
240 | # Check if the target is valid. | |
241 | my $target = $$hash{$key}[0]; | |
242 | if (!$target ~~ @VALID_TARGETS) { | |
243 | print_error("Invalid target '$target' for rule $key"); | |
244 | next; | |
245 | } | |
246 | ||
247 | # Check if the chain is valid. | |
248 | my $chain = $$hash{$key}[1]; | |
249 | if (!$chain ~~ @VALID_CHAINS) { | |
250 | print_error("Invalid chain '$chain' in rule $key"); | |
251 | next; | |
252 | } | |
253 | ||
254 | # Collect all sources. | |
4e54e3c6 | 255 | my @sources = &fwlib::get_addresses($hash, $key, "src"); |
8f4f4634 MT |
256 | |
257 | # Collect all destinations. | |
4e54e3c6 | 258 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); |
6178953b | 259 | |
c0ce9206 MT |
260 | # True if the destination is the firewall itself. |
261 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
262 | ||
6178953b | 263 | # Check if logging should be enabled. |
8f4f4634 | 264 | my $LOG = ($$hash{$key}[17] eq 'ON'); |
6178953b | 265 | |
8f4f4634 MT |
266 | # Check if NAT is enabled and initialize variables, that we use for that. |
267 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
6178953b | 268 | my $NAT_MODE; |
8f4f4634 MT |
269 | if ($NAT) { |
270 | $NAT_MODE = uc($$hash{$key}[31]); | |
271 | } | |
6178953b | 272 | |
8f4f4634 MT |
273 | # Set up time constraints. |
274 | my @time_options = (); | |
275 | if ($$hash{$key}[18] eq 'ON') { | |
276 | push(@time_options, ("-m", "time")); | |
6178953b | 277 | |
8f4f4634 MT |
278 | # Select all days of the week this match is active. |
279 | my @weekdays = (); | |
280 | if ($$hash{$key}[19] ne '') { | |
281 | push (@weekdays, "Mon"); | |
282 | } | |
283 | if ($$hash{$key}[20] ne '') { | |
284 | push (@weekdays, "Tue"); | |
285 | } | |
286 | if ($$hash{$key}[21] ne '') { | |
287 | push (@weekdays, "Wed"); | |
288 | } | |
289 | if ($$hash{$key}[22] ne '') { | |
290 | push (@weekdays, "Thu"); | |
291 | } | |
292 | if ($$hash{$key}[23] ne '') { | |
293 | push (@weekdays, "Fri"); | |
294 | } | |
295 | if ($$hash{$key}[24] ne '') { | |
296 | push (@weekdays, "Sat"); | |
297 | } | |
298 | if ($$hash{$key}[25] ne '') { | |
299 | push (@weekdays, "Sun"); | |
300 | } | |
301 | if (@weekdays) { | |
302 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
303 | } | |
6178953b | 304 | |
8f4f4634 MT |
305 | # Convert start time. |
306 | my $time_start = &format_time($$hash{$key}[26]); | |
307 | if ($time_start) { | |
308 | push(@time_options, ("--timestart", $time_start)); | |
a6edca5a | 309 | } |
6178953b | 310 | |
8f4f4634 MT |
311 | # Convert end time. |
312 | my $time_stop = &format_time($$hash{$key}[27]); | |
313 | if ($time_stop) { | |
314 | push(@time_options, ("--timestop", $time_stop)); | |
315 | } | |
a6edca5a | 316 | } |
6178953b | 317 | |
d2793ea8 AM |
318 | # Concurrent connection limit |
319 | my @ratelimit_options = (); | |
791c2b45 | 320 | |
d840d02a | 321 | if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) { |
d2793ea8 AM |
322 | my $conn_limit = $$hash{$key}[33]; |
323 | ||
324 | if ($conn_limit ge 1) { | |
325 | push(@ratelimit_options, ("-m", "connlimit")); | |
326 | ||
327 | # Use the the entire source IP address | |
328 | push(@ratelimit_options, "--connlimit-saddr"); | |
329 | push(@ratelimit_options, ("--connlimit-mask", "32")); | |
330 | ||
331 | # Apply the limit | |
332 | push(@ratelimit_options, ("--connlimit-upto", $conn_limit)); | |
333 | } | |
334 | } | |
335 | ||
336 | # Ratelimit | |
d840d02a | 337 | if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) { |
d2793ea8 AM |
338 | my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]"; |
339 | ||
d840d02a MT |
340 | if ($rate_limit) { |
341 | push(@ratelimit_options, ("-m", "limit")); | |
342 | push(@ratelimit_options, ("--limit", $rate_limit)); | |
343 | } | |
d2793ea8 AM |
344 | } |
345 | ||
8f4f4634 MT |
346 | # Check which protocols are used in this rule and so that we can |
347 | # later group rules by protocols. | |
348 | my @protocols = &get_protocols($hash, $key); | |
349 | if (!@protocols) { | |
350 | print_error("Invalid protocol configuration for rule $key"); | |
351 | next; | |
352 | } | |
353 | ||
354 | foreach my $protocol (@protocols) { | |
355 | # Check if the given protocol is supported. | |
356 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
357 | print_error("Protocol $protocol is not supported (rule $key)"); | |
358 | next; | |
2a81ab0d | 359 | } |
8f4f4634 MT |
360 | |
361 | # Prepare protocol options (like ICMP types, ports, etc...). | |
d7a14d01 | 362 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); |
8f4f4634 MT |
363 | |
364 | # Check if this protocol knows ports. | |
365 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
366 | ||
02574191 MT |
367 | foreach my $src (@sources) { |
368 | # Skip invalid source. | |
4e9a2b57 | 369 | next unless (defined $src); |
02574191 | 370 | next unless ($src); |
8f4f4634 | 371 | |
02574191 | 372 | # Sanitize source. |
48f07c19 | 373 | my $source = @$src[0]; |
02574191 MT |
374 | if ($source ~~ @ANY_ADDRESSES) { |
375 | $source = ""; | |
376 | } | |
377 | ||
48f07c19 AM |
378 | my $source_intf = @$src[1]; |
379 | ||
02574191 MT |
380 | foreach my $dst (@destinations) { |
381 | # Skip invalid rules. | |
4e9a2b57 | 382 | next unless (defined $dst); |
02574191 | 383 | next if (!$dst || ($dst eq "none")); |
c2a1af75 MT |
384 | |
385 | # Sanitize destination. | |
48f07c19 | 386 | my $destination = @$dst[0]; |
c2a1af75 MT |
387 | if ($destination ~~ @ANY_ADDRESSES) { |
388 | $destination = ""; | |
389 | } | |
390 | ||
48f07c19 AM |
391 | my $destination_intf = @$dst[1]; |
392 | ||
8f4f4634 MT |
393 | # Array with iptables arguments. |
394 | my @options = (); | |
395 | ||
396 | # Append protocol. | |
397 | if ($protocol ne "all") { | |
8f4f4634 | 398 | push(@options, @protocol_options); |
2a81ab0d | 399 | } |
8f4f4634 | 400 | |
6e87f0aa MT |
401 | # Prepare source options. |
402 | my @source_options = (); | |
8f4f4634 | 403 | if ($source =~ /mac/) { |
6e87f0aa | 404 | push(@source_options, $source); |
07106467 SS |
405 | } elsif ($source =~ /-m set/) { |
406 | # Grab location code from hash. | |
407 | my $loc_src = $$hash{$key}[4]; | |
408 | ||
27828969 SS |
409 | # Check if the network list for this country already has been loaded. |
410 | unless($loaded_ipset_lists{$loc_src}) { | |
411 | # Call function to load the networks list for this country. | |
412 | &ipset_restore($loc_src); | |
413 | ||
414 | # Store to the hash that this list has been loaded. | |
415 | $loaded_ipset_lists{$loc_src} = "1"; | |
416 | } | |
07106467 | 417 | |
b9ca2fa6 AM |
418 | push(@source_options, $source); |
419 | } elsif($source) { | |
6e87f0aa | 420 | push(@source_options, ("-s", $source)); |
2a81ab0d | 421 | } |
14f7cb87 | 422 | |
6e87f0aa | 423 | # Prepare destination options. |
c2a1af75 | 424 | my @destination_options = (); |
07106467 SS |
425 | if ($destination =~ /-m set/) { |
426 | # Grab location code from hash. | |
427 | my $loc_dst = $$hash{$key}[6]; | |
428 | ||
27828969 SS |
429 | # Check if the network list for this country already has been loaded. |
430 | unless($loaded_ipset_lists{$loc_dst}) { | |
431 | # Call function to load the networks list for this country. | |
432 | &ipset_restore($loc_dst); | |
433 | ||
434 | # Store to the hash that this list has been loaded. | |
435 | $loaded_ipset_lists{$loc_dst} = "1"; | |
436 | } | |
07106467 | 437 | |
b9ca2fa6 AM |
438 | push(@destination_options, $destination); |
439 | } elsif ($destination) { | |
c2a1af75 MT |
440 | push(@destination_options, ("-d", $destination)); |
441 | } | |
14f7cb87 | 442 | |
249839b0 MT |
443 | # Add source and destination interface to the filter rules. |
444 | # These are supposed to help filtering forged packets that originate | |
445 | # from BLUE with an IP address from GREEN for instance. | |
446 | my @source_intf_options = (); | |
447 | if ($source_intf) { | |
448 | push(@source_intf_options, ("-i", $source_intf)); | |
449 | } | |
450 | ||
451 | my @destination_intf_options = (); | |
452 | if ($destination_intf) { | |
453 | push(@destination_intf_options, ("-o", $destination_intf)); | |
454 | } | |
455 | ||
8f4f4634 MT |
456 | # Add time constraint options. |
457 | push(@options, @time_options); | |
14f7cb87 | 458 | |
d2793ea8 AM |
459 | # Add ratelimiting option |
460 | push(@options, @ratelimit_options); | |
461 | ||
aa5f4b65 | 462 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 463 | if ($source) { |
da7a2208 | 464 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
465 | } |
466 | ||
aa5f4b65 MT |
467 | my $firewall_is_in_destination_subnet = 1; |
468 | if ($destination) { | |
469 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
470 | } | |
471 | ||
8f4f4634 MT |
472 | # Process NAT rules. |
473 | if ($NAT) { | |
4e54e3c6 | 474 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 475 | |
8f4f4634 MT |
476 | # Skip NAT rules if the NAT address is unknown |
477 | # (i.e. no internet connection has been established, yet). | |
478 | next unless ($nat_address); | |
b05ec50a | 479 | |
8f4f4634 MT |
480 | # Destination NAT |
481 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
482 | my @nat_options = (); |
483 | if ($protocol ne "all") { | |
484 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
485 | push(@nat_options, @nat_protocol_options); | |
486 | } | |
21b37391 SS |
487 | |
488 | # Add time options. | |
ff7cb6d6 MT |
489 | push(@nat_options, @time_options); |
490 | ||
21b37391 SS |
491 | # Determine if a REDIRECT rule should be created. |
492 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports); | |
493 | ||
ff7cb6d6 | 494 | # Make port-forwardings useable from the internal networks. |
21b37391 SS |
495 | if (!$use_redirect) { |
496 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
497 | unless ($nat_address ~~ @internal_addresses) { | |
498 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); | |
499 | } | |
ff7cb6d6 MT |
500 | } |
501 | ||
21b37391 | 502 | # Add source options. |
6e87f0aa | 503 | push(@nat_options, @source_options); |
21b37391 SS |
504 | |
505 | # Add NAT address. | |
506 | if (!$use_redirect) { | |
507 | push(@nat_options, ("-d", $nat_address)); | |
508 | } | |
6e87f0aa | 509 | |
c0ce9206 | 510 | my $dnat_port; |
8f4f4634 | 511 | if ($protocol_has_ports) { |
c0ce9206 MT |
512 | $dnat_port = &get_dnat_target_port($hash, $key); |
513 | } | |
514 | ||
515 | my @nat_action_options = (); | |
b05ec50a | 516 | |
c0ce9206 | 517 | # Use iptables REDIRECT |
c0ce9206 | 518 | if ($use_redirect) { |
21b37391 SS |
519 | push(@nat_action_options, ("-j", "REDIRECT")); |
520 | ||
521 | # Redirect to specified port if one has given. | |
522 | if ($dnat_port) { | |
523 | push(@nat_action_options, ("--to-ports", $dnat_port)); | |
524 | } | |
c0ce9206 MT |
525 | |
526 | # Use iptables DNAT | |
527 | } else { | |
f98bb538 MT |
528 | if ($destination_is_firewall && !$destination) { |
529 | $destination = &fwlib::get_external_address(); | |
530 | } | |
531 | next unless ($destination); | |
532 | ||
c0ce9206 MT |
533 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
534 | @destination_options = ("-d", $dnat_address); | |
535 | ||
536 | if ($protocol_has_ports) { | |
537 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
538 | ||
539 | if ($dnat_port) { | |
540 | $dnat_address .= ":$dnat_port"; | |
541 | } | |
86a921ee | 542 | } |
c0ce9206 MT |
543 | |
544 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 545 | } |
8f4f4634 MT |
546 | |
547 | if ($LOG) { | |
3bb4bb3f | 548 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 549 | } |
c0ce9206 | 550 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
551 | |
552 | # Source NAT | |
553 | } elsif ($NAT_MODE eq "SNAT") { | |
c4b7692a | 554 | my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" ); |
6e87f0aa MT |
555 | my @nat_options = @options; |
556 | ||
c4b7692a SS |
557 | # Get addresses for the configured firewall interfaces. |
558 | my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
559 | ||
560 | # Check if the nat_address is one of the local addresses. | |
561 | foreach my $local_address (@local_addresses) { | |
562 | if ($nat_address eq $local_address) { | |
563 | # Clear SNAT options. | |
564 | @snat_options = (); | |
565 | ||
566 | # Finish loop. | |
567 | last; | |
568 | } | |
569 | } | |
570 | ||
249839b0 | 571 | push(@nat_options, @destination_intf_options); |
6e87f0aa MT |
572 | push(@nat_options, @source_options); |
573 | push(@nat_options, @destination_options); | |
574 | ||
8f4f4634 | 575 | if ($LOG) { |
c4b7692a | 576 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 577 | } |
c4b7692a | 578 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
579 | } |
580 | } | |
8f4f4634 | 581 | |
6e87f0aa MT |
582 | push(@options, @source_options); |
583 | push(@options, @destination_options); | |
584 | ||
8f4f4634 | 585 | # Insert firewall rule. |
c22369a9 | 586 | if ($LOG) { |
249839b0 | 587 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 | 588 | } |
249839b0 | 589 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target"); |
aa5f4b65 MT |
590 | |
591 | # Handle forwarding rules and add corresponding rules for firewall access. | |
592 | if ($chain eq $CHAIN_FORWARD) { | |
593 | # If the firewall is part of the destination subnet and access to the destination network | |
594 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
595 | # for the firewall, too. | |
596 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
c22369a9 | 597 | if ($LOG) { |
249839b0 | 598 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); |
aa5f4b65 | 599 | } |
249839b0 | 600 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target"); |
aa5f4b65 MT |
601 | } |
602 | ||
603 | # Likewise. | |
604 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
c22369a9 | 605 | if ($LOG) { |
249839b0 | 606 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); |
aa5f4b65 | 607 | } |
249839b0 | 608 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target"); |
aa5f4b65 MT |
609 | } |
610 | } | |
2a81ab0d AM |
611 | } |
612 | } | |
613 | } | |
2a81ab0d AM |
614 | } |
615 | } | |
97ab0569 | 616 | |
b05ec50a MT |
617 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
618 | sub format_time { | |
619 | my $val = shift; | |
620 | ||
621 | # Convert the given time into minutes. | |
622 | my $minutes = &time_convert_to_minutes($val); | |
623 | ||
624 | # Move the timestamp into UTC. | |
625 | $minutes += &time_utc_offset(); | |
626 | ||
627 | # Make sure $minutes is between 00:00 and 23:59. | |
628 | if ($minutes < 0) { | |
629 | $minutes += 1440; | |
630 | } | |
631 | ||
632 | if ($minutes > 1440) { | |
633 | $minutes -= 1440; | |
634 | } | |
635 | ||
636 | # Format as hh:mm. | |
637 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 638 | } |
97ab0569 | 639 | |
b05ec50a MT |
640 | # Calculates the offsets in minutes from the local timezone to UTC. |
641 | sub time_utc_offset { | |
642 | my @localtime = localtime(time); | |
643 | my @gmtime = gmtime(time); | |
644 | ||
645 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 646 | } |
97ab0569 | 647 | |
b05ec50a MT |
648 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
649 | sub time_convert_to_minutes { | |
650 | my ($hrs, $min) = split(":", shift); | |
651 | ||
652 | return ($hrs * 60) + $min; | |
472136c9 | 653 | } |
97ab0569 MT |
654 | |
655 | sub p2pblock { | |
766c2f60 MT |
656 | open(FILE, "<$p2pfile") or die "Unable to read $p2pfile"; |
657 | my @protocols = (); | |
658 | foreach my $p2pentry (<FILE>) { | |
659 | my @p2pline = split(/\;/, $p2pentry); | |
2a5b19c5 | 660 | next unless ($p2pline[2] eq "off"); |
766c2f60 MT |
661 | |
662 | push(@protocols, "--$p2pline[1]"); | |
36196d0d | 663 | } |
766c2f60 | 664 | close(FILE); |
68d1eb10 | 665 | |
24d36c80 | 666 | run("$IPTABLES -F P2PBLOCK"); |
766c2f60 | 667 | if (@protocols) { |
2a5b19c5 | 668 | run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP"); |
36196d0d AM |
669 | } |
670 | } | |
97ab0569 | 671 | |
5730a5bc | 672 | sub locationblock { |
bbeb2a50 | 673 | # The LOCATIONBLOCK chain now gets flushed by the flush() function. |
211694e5 | 674 | |
5730a5bc SS |
675 | # If location blocking is not enabled, we are finished here. |
676 | if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") { | |
211694e5 SS |
677 | # Exit submodule. Process remaining script. |
678 | return; | |
679 | } | |
680 | ||
2293e1de PM |
681 | # Only check the RED interface, which is ppp0 in case of RED_TYPE being |
682 | # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise. | |
683 | if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") { | |
684 | run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN"); | |
685 | } elsif ($defaultNetworks{'RED_DEV'} ne "") { | |
c69c8200 MT |
686 | run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN"); |
687 | } | |
688 | ||
689 | # Do not check any private address space | |
690 | foreach my $network (@PRIVATE_NETWORKS) { | |
691 | run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN"); | |
692 | } | |
693 | ||
5730a5bc SS |
694 | # Loop through all supported locations and |
695 | # create iptables rules, if blocking for this country | |
211694e5 SS |
696 | # is enabled. |
697 | foreach my $location (@locations) { | |
5730a5bc | 698 | if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") { |
27828969 SS |
699 | # Check if the network list for this country already has been loaded. |
700 | unless($loaded_ipset_lists{$location}) { | |
701 | # Call function to load the networks list for this country. | |
702 | &ipset_restore($location); | |
703 | ||
704 | # Store to the hash that this list has been loaded. | |
705 | $loaded_ipset_lists{$location} = "1"; | |
706 | } | |
0df1d268 SS |
707 | |
708 | # Call iptables and create rule to use the loaded ipset list. | |
709 | run("$IPTABLES -A LOCATIONBLOCK -m set --match-set CC_$location src -j DROP"); | |
211694e5 SS |
710 | } |
711 | } | |
712 | } | |
713 | ||
8f4f4634 MT |
714 | sub get_protocols { |
715 | my $hash = shift; | |
716 | my $key = shift; | |
717 | ||
718 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
719 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
720 | ||
721 | my @protocols = (); | |
722 | ||
723 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
724 | if (!$uses_source_ports && !$uses_services) { | |
725 | push(@protocols, $$hash{$key}[8]); | |
726 | ||
727 | # Rules which either use ports or services. | |
728 | } elsif ($uses_source_ports || $uses_services) { | |
729 | # Check if service group or service | |
730 | if ($$hash{$key}[14] eq 'cust_srv') { | |
731 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
732 | ||
733 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
734 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
735 | push(@protocols, split(",", $protos)); | |
736 | ||
737 | } else { | |
738 | # Fetch the protocol for this rule. | |
739 | my $protocol = lc($$hash{$key}[8]); | |
740 | ||
741 | # Fetch source and destination ports for this rule. | |
742 | my $source_ports = $$hash{$key}[10]; | |
743 | my $destination_ports = $$hash{$key}[15]; | |
744 | ||
745 | # Check if ports are set for protocols which do not support ports. | |
746 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
747 | print_error("$protocol does not support ports"); | |
748 | return (); | |
749 | } | |
750 | ||
751 | push(@protocols, $protocol); | |
2a81ab0d AM |
752 | } |
753 | } | |
8f4f4634 MT |
754 | |
755 | # Remove all empty elements | |
756 | @protocols = map { $_ ? $_ : () } @protocols; | |
757 | ||
758 | # If no protocol has been defined, we assume "all". | |
759 | if (!@protocols) { | |
760 | push(@protocols, "all"); | |
98cee89f | 761 | } |
8f4f4634 MT |
762 | |
763 | # Make all protocol names lowercase. | |
764 | @protocols = map { lc } @protocols; | |
765 | ||
766 | return @protocols; | |
2a81ab0d | 767 | } |
97ab0569 | 768 | |
8f4f4634 MT |
769 | sub get_protocol_options { |
770 | my $hash = shift; | |
771 | my $key = shift; | |
772 | my $protocol = shift; | |
d7a14d01 | 773 | my $nat_options_wanted = shift; |
8f4f4634 MT |
774 | my @options = (); |
775 | ||
d7a14d01 MT |
776 | # Nothing to do if no protocol is specified. |
777 | if ($protocol eq "all") { | |
778 | return @options; | |
779 | } else { | |
780 | push(@options, ("-p", $protocol)); | |
781 | } | |
782 | ||
fcc68a42 MT |
783 | if ($protocol ~~ @PROTOCOLS_WITH_PORTS) { |
784 | # Process source ports. | |
785 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
786 | my $src_ports = $$hash{$key}[10]; | |
8f4f4634 | 787 | |
fcc68a42 MT |
788 | if ($use_src_ports && $src_ports) { |
789 | push(@options, &format_ports($src_ports, "src")); | |
790 | } | |
8f4f4634 | 791 | |
fcc68a42 MT |
792 | # Process destination ports. |
793 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
794 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
8f4f4634 | 795 | |
fcc68a42 MT |
796 | if ($use_dst_ports) { |
797 | my $dst_ports_mode = $$hash{$key}[14]; | |
798 | my $dst_ports = $$hash{$key}[15]; | |
8f4f4634 | 799 | |
fcc68a42 MT |
800 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { |
801 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
802 | $dst_ports = $$hash{$key}[30]; | |
803 | } | |
8f4f4634 | 804 | push(@options, &format_ports($dst_ports, "dst")); |
8f4f4634 | 805 | |
fcc68a42 MT |
806 | } elsif ($dst_ports_mode eq "cust_srv") { |
807 | if ($protocol eq "ICMP") { | |
808 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
809 | } else { | |
810 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
811 | push(@options, &format_ports($dst_ports, "dst")); | |
812 | } | |
813 | ||
814 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
815 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
816 | } | |
2a81ab0d AM |
817 | } |
818 | } | |
8f4f4634 MT |
819 | |
820 | # Check if a single ICMP type is selected. | |
fcc68a42 | 821 | if ($protocol eq "icmp") { |
8f4f4634 MT |
822 | my $icmp_type = $$hash{$key}[9]; |
823 | ||
824 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
825 | push(@options, ("--icmp-type", $icmp_type)); | |
a4c7bf6b AM |
826 | } |
827 | } | |
8f4f4634 MT |
828 | |
829 | return @options; | |
830 | } | |
831 | ||
832 | sub format_ports { | |
833 | my $ports = shift; | |
834 | my $type = shift; | |
835 | ||
836 | my $arg; | |
837 | if ($type eq "src") { | |
838 | $arg = "--sport"; | |
839 | } elsif ($type eq "dst") { | |
840 | $arg = "--dport"; | |
841 | } | |
842 | ||
843 | my @options = (); | |
844 | ||
845 | if ($ports =~ /\|/) { | |
846 | $ports =~ s/\|/,/g; | |
847 | push(@options, ("-m", "multiport")); | |
848 | } | |
849 | ||
1c3044d7 MT |
850 | if ($ports) { |
851 | push(@options, ($arg, $ports)); | |
852 | } | |
8f4f4634 MT |
853 | |
854 | return @options; | |
855 | } | |
856 | ||
857 | sub get_dnat_target_port { | |
858 | my $hash = shift; | |
859 | my $key = shift; | |
860 | ||
861 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
1c3044d7 MT |
862 | my $port = $$hash{$key}[15]; |
863 | my $external_port = $$hash{$key}[30]; | |
864 | ||
865 | if ($external_port && ($port ne $external_port)) { | |
866 | return $$hash{$key}[15]; | |
867 | } | |
8f4f4634 | 868 | } |
2a81ab0d | 869 | } |
6e87f0aa MT |
870 | |
871 | sub add_dnat_mangle_rules { | |
872 | my $nat_address = shift; | |
48f07c19 | 873 | my $interface = shift; |
6e87f0aa MT |
874 | my @options = @_; |
875 | ||
ce31144c | 876 | my $mark = 0x01000000; |
6e87f0aa | 877 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { |
6e87f0aa MT |
878 | # Skip rule if not all required information exists. |
879 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
880 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
881 | ||
48f07c19 AM |
882 | next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"}); |
883 | ||
6e87f0aa MT |
884 | my @mangle_options = @options; |
885 | ||
886 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
887 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
888 | ||
889 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
ce31144c | 890 | push(@mangle_options, ("-j", "MARK", "--set-xmark", "$mark/$NAT_MASK")); |
6e87f0aa MT |
891 | |
892 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
ce31144c MT |
893 | |
894 | $mark <<= 1; | |
6e87f0aa MT |
895 | } |
896 | } | |
3bb4bb3f MT |
897 | |
898 | sub make_log_limit_options { | |
899 | my @options = ("-m", "limit"); | |
900 | ||
901 | # Maybe we should get this from the configuration. | |
902 | my $limit = 10; | |
903 | ||
a85a7a60 | 904 | # We limit log messages to $limit messages per second. |
905 | push(@options, ("--limit", "$limit/second")); | |
3bb4bb3f MT |
906 | |
907 | # And we allow bursts of 2x $limit. | |
908 | push(@options, ("--limit-burst", $limit * 2)); | |
909 | ||
910 | return @options; | |
911 | } | |
e9b5ba41 | 912 | |
da7a2208 MT |
913 | sub firewall_is_in_subnet { |
914 | my $subnet = shift; | |
5cf8c8c1 | 915 | |
e9b5ba41 MT |
916 | # ORANGE is missing here, because nothing may ever access |
917 | # the firewall from this network. | |
4e54e3c6 | 918 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); |
e9b5ba41 | 919 | |
da7a2208 MT |
920 | if ($address) { |
921 | return 1; | |
e9b5ba41 | 922 | } |
da7a2208 MT |
923 | |
924 | return 0; | |
e9b5ba41 | 925 | } |
6babb404 SS |
926 | |
927 | sub ipset_restore ($) { | |
928 | my ($ccode) = @_; | |
929 | ||
930 | # Run ipset and restore the list of the given country code. | |
931 | run("$IPSET restore < $Location::Functions::ipset_db_directory/$ccode.ipset4"); | |
932 | } |