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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 "${General::swroot}/lang.pl"; | |
27 | require "/usr/lib/firewall/firewall-lib.pl"; | |
5730a5bc | 28 | require "${General::swroot}/location-functions.pl"; |
2a81ab0d | 29 | |
68d1eb10 MT |
30 | # Set to one to enable debugging mode. |
31 | my $DEBUG = 0; | |
32 | ||
1f9e7b53 MT |
33 | my $IPTABLES = "iptables --wait"; |
34 | ||
6178953b | 35 | # iptables chains |
8f4f4634 MT |
36 | my $CHAIN_INPUT = "INPUTFW"; |
37 | my $CHAIN_FORWARD = "FORWARDFW"; | |
d98aa95a | 38 | my $CHAIN_OUTPUT = "OUTGOINGFW"; |
8f4f4634 | 39 | my $CHAIN = $CHAIN_FORWARD; |
6178953b MT |
40 | my $CHAIN_NAT_SOURCE = "NAT_SOURCE"; |
41 | my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION"; | |
6e87f0aa | 42 | my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION"; |
8f4f4634 | 43 | my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT); |
c2a1af75 | 44 | my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0"); |
8f4f4634 MT |
45 | |
46 | my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip"); | |
47 | my @PROTOCOLS_WITH_PORTS = ("tcp", "udp"); | |
48 | ||
49 | my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT"); | |
6178953b | 50 | |
c69c8200 MT |
51 | my @PRIVATE_NETWORKS = ( |
52 | "10.0.0.0/8", | |
53 | "172.16.0.0/12", | |
54 | "192.168.0.0/16", | |
55 | "100.64.0.0/10", | |
56 | ); | |
57 | ||
2a81ab0d | 58 | my %fwdfwsettings=(); |
aa5f4b65 | 59 | my %fwoptions = (); |
2a81ab0d | 60 | my %defaultNetworks=(); |
8f4f4634 | 61 | my %configfwdfw=();; |
2a81ab0d | 62 | my %customgrp=(); |
2a81ab0d | 63 | my %configinputfw=(); |
5d7faa45 | 64 | my %configoutgoingfw=(); |
a6edca5a | 65 | my %confignatfw=(); |
5730a5bc SS |
66 | my %locationsettings = ( |
67 | "LOCATIONBLOCK_ENABLED" => "off" | |
f5ad4246 SS |
68 | ); |
69 | ||
36196d0d | 70 | my @p2ps=(); |
2a81ab0d | 71 | |
6d8eb5de AM |
72 | my $configfwdfw = "${General::swroot}/firewall/config"; |
73 | my $configinput = "${General::swroot}/firewall/input"; | |
74 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
75 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
5730a5bc | 76 | my $locationfile = "${General::swroot}/firewall/locationblock"; |
2a81ab0d | 77 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 78 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 79 | |
6d8eb5de | 80 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 81 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 82 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
83 | &General::readhasharray($configfwdfw, \%configfwdfw); |
84 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 85 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 86 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 87 | |
5730a5bc SS |
88 | # Check if the location settings file exists |
89 | if (-e "$locationfile") { | |
f5ad4246 | 90 | # Read settings file |
5730a5bc | 91 | &General::readhash("$locationfile", \%locationsettings); |
f5ad4246 SS |
92 | } |
93 | ||
5730a5bc SS |
94 | # Get all available locations. |
95 | my @locations = &Location::Functions::get_locations(); | |
f5ad4246 | 96 | |
3bb4bb3f MT |
97 | my @log_limit_options = &make_log_limit_options(); |
98 | ||
aa5f4b65 MT |
99 | my $POLICY_INPUT_ALLOWED = 0; |
100 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
101 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
102 | ||
103 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
104 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
105 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
106 | ||
8531b94a MT |
107 | # MAIN |
108 | &main(); | |
109 | ||
110 | sub main { | |
111 | # Flush all chains. | |
112 | &flush(); | |
113 | ||
2d0c7a9f AM |
114 | # Prepare firewall rules. |
115 | if (! -z "${General::swroot}/firewall/input"){ | |
116 | &buildrules(\%configinputfw); | |
117 | } | |
118 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
119 | &buildrules(\%configoutgoingfw); | |
120 | } | |
121 | if (! -z "${General::swroot}/firewall/config"){ | |
122 | &buildrules(\%configfwdfw); | |
123 | } | |
8531b94a MT |
124 | |
125 | # Load P2P block rules. | |
126 | &p2pblock(); | |
127 | ||
5730a5bc SS |
128 | # Load Location block rules. |
129 | &locationblock(); | |
211694e5 | 130 | |
8531b94a MT |
131 | # Reload firewall policy. |
132 | run("/usr/sbin/firewall-policy"); | |
2d0c7a9f AM |
133 | |
134 | #Reload firewall.local if present | |
135 | if ( -f '/etc/sysconfig/firewall.local'){ | |
136 | run("/etc/sysconfig/firewall.local reload"); | |
137 | } | |
2a81ab0d | 138 | } |
97ab0569 | 139 | |
68d1eb10 MT |
140 | sub run { |
141 | # Executes or prints the given shell command. | |
142 | my $command = shift; | |
143 | ||
144 | if ($DEBUG) { | |
145 | print "$command\n"; | |
146 | } else { | |
147 | system "$command"; | |
6e87f0aa MT |
148 | |
149 | if ($?) { | |
150 | print_error("ERROR: $command"); | |
151 | } | |
68d1eb10 MT |
152 | } |
153 | } | |
154 | ||
6178953b MT |
155 | sub print_error { |
156 | my $message = shift; | |
157 | ||
158 | print STDERR "$message\n"; | |
159 | } | |
160 | ||
8f4f4634 MT |
161 | sub print_rule { |
162 | my $hash = shift; | |
163 | ||
164 | print "\nRULE:"; | |
165 | ||
166 | my $i = 0; | |
167 | foreach (@$hash) { | |
168 | printf(" %2d: %s", $i++, $_); | |
169 | } | |
170 | print "\n"; | |
171 | } | |
172 | ||
791c2b45 MT |
173 | sub count_elements { |
174 | my $hash = shift; | |
175 | ||
176 | return scalar @$hash; | |
177 | } | |
178 | ||
97ab0569 | 179 | sub flush { |
d98aa95a MT |
180 | run("$IPTABLES -F $CHAIN_INPUT"); |
181 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
182 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
183 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
184 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 185 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
86a921ee | 186 | } |
97ab0569 | 187 | |
97ab0569 | 188 | sub buildrules { |
8f4f4634 MT |
189 | my $hash = shift; |
190 | ||
aa5f4b65 MT |
191 | # Search for targets that need to be specially handled when adding |
192 | # forwarding rules. Additional rules will automatically get inserted | |
193 | # into the INPUT/OUTPUT chains for these targets. | |
194 | my @special_input_targets = (); | |
195 | if (!$POLICY_FORWARD_ALLOWED) { | |
196 | push(@special_input_targets, "ACCEPT"); | |
197 | } | |
198 | ||
199 | if ($POLICY_INPUT_ACTION eq "DROP") { | |
ae93dd3d | 200 | push(@special_input_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 201 | } elsif ($POLICY_INPUT_ACTION eq "REJECT") { |
ae93dd3d | 202 | push(@special_input_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
203 | } |
204 | ||
205 | my @special_output_targets = (); | |
206 | if ($POLICY_OUTPUT_ALLOWED) { | |
207 | push(@special_output_targets, ("DROP", "REJECT")); | |
208 | } else { | |
209 | push(@special_output_targets, "ACCEPT"); | |
210 | ||
211 | if ($POLICY_OUTPUT_ACTION eq "DROP") { | |
ae93dd3d | 212 | push(@special_output_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 213 | } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") { |
ae93dd3d | 214 | push(@special_output_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
215 | } |
216 | } | |
217 | ||
8f4f4634 MT |
218 | foreach my $key (sort {$a <=> $b} keys %$hash) { |
219 | # Skip disabled rules. | |
220 | next unless ($$hash{$key}[2] eq 'ON'); | |
221 | ||
791c2b45 MT |
222 | # Count number of elements in this line |
223 | my $elements = &count_elements($$hash{$key}); | |
224 | ||
8f4f4634 MT |
225 | if ($DEBUG) { |
226 | print_rule($$hash{$key}); | |
227 | } | |
228 | ||
229 | # Check if the target is valid. | |
230 | my $target = $$hash{$key}[0]; | |
231 | if (!$target ~~ @VALID_TARGETS) { | |
232 | print_error("Invalid target '$target' for rule $key"); | |
233 | next; | |
234 | } | |
235 | ||
236 | # Check if the chain is valid. | |
237 | my $chain = $$hash{$key}[1]; | |
238 | if (!$chain ~~ @VALID_CHAINS) { | |
239 | print_error("Invalid chain '$chain' in rule $key"); | |
240 | next; | |
241 | } | |
242 | ||
243 | # Collect all sources. | |
4e54e3c6 | 244 | my @sources = &fwlib::get_addresses($hash, $key, "src"); |
8f4f4634 MT |
245 | |
246 | # Collect all destinations. | |
4e54e3c6 | 247 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); |
6178953b | 248 | |
c0ce9206 MT |
249 | # True if the destination is the firewall itself. |
250 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
251 | ||
6178953b | 252 | # Check if logging should be enabled. |
8f4f4634 | 253 | my $LOG = ($$hash{$key}[17] eq 'ON'); |
6178953b | 254 | |
8f4f4634 MT |
255 | # Check if NAT is enabled and initialize variables, that we use for that. |
256 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
6178953b | 257 | my $NAT_MODE; |
8f4f4634 MT |
258 | if ($NAT) { |
259 | $NAT_MODE = uc($$hash{$key}[31]); | |
260 | } | |
6178953b | 261 | |
8f4f4634 MT |
262 | # Set up time constraints. |
263 | my @time_options = (); | |
264 | if ($$hash{$key}[18] eq 'ON') { | |
265 | push(@time_options, ("-m", "time")); | |
6178953b | 266 | |
8f4f4634 MT |
267 | # Select all days of the week this match is active. |
268 | my @weekdays = (); | |
269 | if ($$hash{$key}[19] ne '') { | |
270 | push (@weekdays, "Mon"); | |
271 | } | |
272 | if ($$hash{$key}[20] ne '') { | |
273 | push (@weekdays, "Tue"); | |
274 | } | |
275 | if ($$hash{$key}[21] ne '') { | |
276 | push (@weekdays, "Wed"); | |
277 | } | |
278 | if ($$hash{$key}[22] ne '') { | |
279 | push (@weekdays, "Thu"); | |
280 | } | |
281 | if ($$hash{$key}[23] ne '') { | |
282 | push (@weekdays, "Fri"); | |
283 | } | |
284 | if ($$hash{$key}[24] ne '') { | |
285 | push (@weekdays, "Sat"); | |
286 | } | |
287 | if ($$hash{$key}[25] ne '') { | |
288 | push (@weekdays, "Sun"); | |
289 | } | |
290 | if (@weekdays) { | |
291 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
292 | } | |
6178953b | 293 | |
8f4f4634 MT |
294 | # Convert start time. |
295 | my $time_start = &format_time($$hash{$key}[26]); | |
296 | if ($time_start) { | |
297 | push(@time_options, ("--timestart", $time_start)); | |
a6edca5a | 298 | } |
6178953b | 299 | |
8f4f4634 MT |
300 | # Convert end time. |
301 | my $time_stop = &format_time($$hash{$key}[27]); | |
302 | if ($time_stop) { | |
303 | push(@time_options, ("--timestop", $time_stop)); | |
304 | } | |
a6edca5a | 305 | } |
6178953b | 306 | |
d2793ea8 AM |
307 | # Concurrent connection limit |
308 | my @ratelimit_options = (); | |
791c2b45 | 309 | |
d840d02a | 310 | if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) { |
d2793ea8 AM |
311 | my $conn_limit = $$hash{$key}[33]; |
312 | ||
313 | if ($conn_limit ge 1) { | |
314 | push(@ratelimit_options, ("-m", "connlimit")); | |
315 | ||
316 | # Use the the entire source IP address | |
317 | push(@ratelimit_options, "--connlimit-saddr"); | |
318 | push(@ratelimit_options, ("--connlimit-mask", "32")); | |
319 | ||
320 | # Apply the limit | |
321 | push(@ratelimit_options, ("--connlimit-upto", $conn_limit)); | |
322 | } | |
323 | } | |
324 | ||
325 | # Ratelimit | |
d840d02a | 326 | if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) { |
d2793ea8 AM |
327 | my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]"; |
328 | ||
d840d02a MT |
329 | if ($rate_limit) { |
330 | push(@ratelimit_options, ("-m", "limit")); | |
331 | push(@ratelimit_options, ("--limit", $rate_limit)); | |
332 | } | |
d2793ea8 AM |
333 | } |
334 | ||
8f4f4634 MT |
335 | # Check which protocols are used in this rule and so that we can |
336 | # later group rules by protocols. | |
337 | my @protocols = &get_protocols($hash, $key); | |
338 | if (!@protocols) { | |
339 | print_error("Invalid protocol configuration for rule $key"); | |
340 | next; | |
341 | } | |
342 | ||
343 | foreach my $protocol (@protocols) { | |
344 | # Check if the given protocol is supported. | |
345 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
346 | print_error("Protocol $protocol is not supported (rule $key)"); | |
347 | next; | |
2a81ab0d | 348 | } |
8f4f4634 MT |
349 | |
350 | # Prepare protocol options (like ICMP types, ports, etc...). | |
d7a14d01 | 351 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); |
8f4f4634 MT |
352 | |
353 | # Check if this protocol knows ports. | |
354 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
355 | ||
02574191 MT |
356 | foreach my $src (@sources) { |
357 | # Skip invalid source. | |
4e9a2b57 | 358 | next unless (defined $src); |
02574191 | 359 | next unless ($src); |
8f4f4634 | 360 | |
02574191 | 361 | # Sanitize source. |
48f07c19 | 362 | my $source = @$src[0]; |
02574191 MT |
363 | if ($source ~~ @ANY_ADDRESSES) { |
364 | $source = ""; | |
365 | } | |
366 | ||
48f07c19 AM |
367 | my $source_intf = @$src[1]; |
368 | ||
02574191 MT |
369 | foreach my $dst (@destinations) { |
370 | # Skip invalid rules. | |
4e9a2b57 | 371 | next unless (defined $dst); |
02574191 | 372 | next if (!$dst || ($dst eq "none")); |
c2a1af75 MT |
373 | |
374 | # Sanitize destination. | |
48f07c19 | 375 | my $destination = @$dst[0]; |
c2a1af75 MT |
376 | if ($destination ~~ @ANY_ADDRESSES) { |
377 | $destination = ""; | |
378 | } | |
379 | ||
48f07c19 AM |
380 | my $destination_intf = @$dst[1]; |
381 | ||
8f4f4634 MT |
382 | # Array with iptables arguments. |
383 | my @options = (); | |
384 | ||
385 | # Append protocol. | |
386 | if ($protocol ne "all") { | |
8f4f4634 | 387 | push(@options, @protocol_options); |
2a81ab0d | 388 | } |
8f4f4634 | 389 | |
6e87f0aa MT |
390 | # Prepare source options. |
391 | my @source_options = (); | |
8f4f4634 | 392 | if ($source =~ /mac/) { |
6e87f0aa | 393 | push(@source_options, $source); |
b9ca2fa6 AM |
394 | } elsif ($source =~ /-m geoip/) { |
395 | push(@source_options, $source); | |
396 | } elsif($source) { | |
6e87f0aa | 397 | push(@source_options, ("-s", $source)); |
2a81ab0d | 398 | } |
14f7cb87 | 399 | |
6e87f0aa | 400 | # Prepare destination options. |
c2a1af75 | 401 | my @destination_options = (); |
b9ca2fa6 AM |
402 | if ($destination =~ /-m geoip/) { |
403 | push(@destination_options, $destination); | |
404 | } elsif ($destination) { | |
c2a1af75 MT |
405 | push(@destination_options, ("-d", $destination)); |
406 | } | |
14f7cb87 | 407 | |
249839b0 MT |
408 | # Add source and destination interface to the filter rules. |
409 | # These are supposed to help filtering forged packets that originate | |
410 | # from BLUE with an IP address from GREEN for instance. | |
411 | my @source_intf_options = (); | |
412 | if ($source_intf) { | |
413 | push(@source_intf_options, ("-i", $source_intf)); | |
414 | } | |
415 | ||
416 | my @destination_intf_options = (); | |
417 | if ($destination_intf) { | |
418 | push(@destination_intf_options, ("-o", $destination_intf)); | |
419 | } | |
420 | ||
8f4f4634 MT |
421 | # Add time constraint options. |
422 | push(@options, @time_options); | |
14f7cb87 | 423 | |
d2793ea8 AM |
424 | # Add ratelimiting option |
425 | push(@options, @ratelimit_options); | |
426 | ||
aa5f4b65 | 427 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 428 | if ($source) { |
da7a2208 | 429 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
430 | } |
431 | ||
aa5f4b65 MT |
432 | my $firewall_is_in_destination_subnet = 1; |
433 | if ($destination) { | |
434 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
435 | } | |
436 | ||
8f4f4634 MT |
437 | # Process NAT rules. |
438 | if ($NAT) { | |
4e54e3c6 | 439 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 440 | |
8f4f4634 MT |
441 | # Skip NAT rules if the NAT address is unknown |
442 | # (i.e. no internet connection has been established, yet). | |
443 | next unless ($nat_address); | |
b05ec50a | 444 | |
8f4f4634 MT |
445 | # Destination NAT |
446 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
447 | my @nat_options = (); |
448 | if ($protocol ne "all") { | |
449 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
450 | push(@nat_options, @nat_protocol_options); | |
451 | } | |
ff7cb6d6 MT |
452 | push(@nat_options, @time_options); |
453 | ||
454 | # Make port-forwardings useable from the internal networks. | |
455 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
456 | unless ($nat_address ~~ @internal_addresses) { | |
48f07c19 | 457 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); |
ff7cb6d6 MT |
458 | } |
459 | ||
6e87f0aa | 460 | push(@nat_options, @source_options); |
8f4f4634 | 461 | push(@nat_options, ("-d", $nat_address)); |
6e87f0aa | 462 | |
c0ce9206 | 463 | my $dnat_port; |
8f4f4634 | 464 | if ($protocol_has_ports) { |
c0ce9206 MT |
465 | $dnat_port = &get_dnat_target_port($hash, $key); |
466 | } | |
467 | ||
468 | my @nat_action_options = (); | |
b05ec50a | 469 | |
c0ce9206 MT |
470 | # Use iptables REDIRECT |
471 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port); | |
472 | if ($use_redirect) { | |
473 | push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port)); | |
474 | ||
475 | # Use iptables DNAT | |
476 | } else { | |
f98bb538 MT |
477 | if ($destination_is_firewall && !$destination) { |
478 | $destination = &fwlib::get_external_address(); | |
479 | } | |
480 | next unless ($destination); | |
481 | ||
c0ce9206 MT |
482 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
483 | @destination_options = ("-d", $dnat_address); | |
484 | ||
485 | if ($protocol_has_ports) { | |
486 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
487 | ||
488 | if ($dnat_port) { | |
489 | $dnat_address .= ":$dnat_port"; | |
490 | } | |
86a921ee | 491 | } |
c0ce9206 MT |
492 | |
493 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 494 | } |
8f4f4634 MT |
495 | |
496 | if ($LOG) { | |
3bb4bb3f | 497 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 498 | } |
c0ce9206 | 499 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
500 | |
501 | # Source NAT | |
502 | } elsif ($NAT_MODE eq "SNAT") { | |
c4b7692a | 503 | my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" ); |
6e87f0aa MT |
504 | my @nat_options = @options; |
505 | ||
c4b7692a SS |
506 | # Get addresses for the configured firewall interfaces. |
507 | my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
508 | ||
509 | # Check if the nat_address is one of the local addresses. | |
510 | foreach my $local_address (@local_addresses) { | |
511 | if ($nat_address eq $local_address) { | |
512 | # Clear SNAT options. | |
513 | @snat_options = (); | |
514 | ||
515 | # Finish loop. | |
516 | last; | |
517 | } | |
518 | } | |
519 | ||
249839b0 | 520 | push(@nat_options, @destination_intf_options); |
6e87f0aa MT |
521 | push(@nat_options, @source_options); |
522 | push(@nat_options, @destination_options); | |
523 | ||
8f4f4634 | 524 | if ($LOG) { |
c4b7692a | 525 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 526 | } |
c4b7692a | 527 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
528 | } |
529 | } | |
8f4f4634 | 530 | |
6e87f0aa MT |
531 | push(@options, @source_options); |
532 | push(@options, @destination_options); | |
533 | ||
8f4f4634 | 534 | # Insert firewall rule. |
c22369a9 | 535 | if ($LOG) { |
249839b0 | 536 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 | 537 | } |
249839b0 | 538 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target"); |
aa5f4b65 MT |
539 | |
540 | # Handle forwarding rules and add corresponding rules for firewall access. | |
541 | if ($chain eq $CHAIN_FORWARD) { | |
542 | # If the firewall is part of the destination subnet and access to the destination network | |
543 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
544 | # for the firewall, too. | |
545 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
c22369a9 | 546 | if ($LOG) { |
249839b0 | 547 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); |
aa5f4b65 | 548 | } |
249839b0 | 549 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target"); |
aa5f4b65 MT |
550 | } |
551 | ||
552 | # Likewise. | |
553 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
c22369a9 | 554 | if ($LOG) { |
249839b0 | 555 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); |
aa5f4b65 | 556 | } |
249839b0 | 557 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target"); |
aa5f4b65 MT |
558 | } |
559 | } | |
2a81ab0d AM |
560 | } |
561 | } | |
562 | } | |
2a81ab0d AM |
563 | } |
564 | } | |
97ab0569 | 565 | |
b05ec50a MT |
566 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
567 | sub format_time { | |
568 | my $val = shift; | |
569 | ||
570 | # Convert the given time into minutes. | |
571 | my $minutes = &time_convert_to_minutes($val); | |
572 | ||
573 | # Move the timestamp into UTC. | |
574 | $minutes += &time_utc_offset(); | |
575 | ||
576 | # Make sure $minutes is between 00:00 and 23:59. | |
577 | if ($minutes < 0) { | |
578 | $minutes += 1440; | |
579 | } | |
580 | ||
581 | if ($minutes > 1440) { | |
582 | $minutes -= 1440; | |
583 | } | |
584 | ||
585 | # Format as hh:mm. | |
586 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 587 | } |
97ab0569 | 588 | |
b05ec50a MT |
589 | # Calculates the offsets in minutes from the local timezone to UTC. |
590 | sub time_utc_offset { | |
591 | my @localtime = localtime(time); | |
592 | my @gmtime = gmtime(time); | |
593 | ||
594 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 595 | } |
97ab0569 | 596 | |
b05ec50a MT |
597 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
598 | sub time_convert_to_minutes { | |
599 | my ($hrs, $min) = split(":", shift); | |
600 | ||
601 | return ($hrs * 60) + $min; | |
472136c9 | 602 | } |
97ab0569 MT |
603 | |
604 | sub p2pblock { | |
766c2f60 MT |
605 | open(FILE, "<$p2pfile") or die "Unable to read $p2pfile"; |
606 | my @protocols = (); | |
607 | foreach my $p2pentry (<FILE>) { | |
608 | my @p2pline = split(/\;/, $p2pentry); | |
2a5b19c5 | 609 | next unless ($p2pline[2] eq "off"); |
766c2f60 MT |
610 | |
611 | push(@protocols, "--$p2pline[1]"); | |
36196d0d | 612 | } |
766c2f60 | 613 | close(FILE); |
68d1eb10 | 614 | |
24d36c80 | 615 | run("$IPTABLES -F P2PBLOCK"); |
766c2f60 | 616 | if (@protocols) { |
2a5b19c5 | 617 | run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP"); |
36196d0d AM |
618 | } |
619 | } | |
97ab0569 | 620 | |
5730a5bc | 621 | sub locationblock { |
0505af9d | 622 | # Flush iptables chain. |
0e6eca78 | 623 | run("$IPTABLES -F LOCATIONBLOCK"); |
211694e5 | 624 | |
5730a5bc SS |
625 | # If location blocking is not enabled, we are finished here. |
626 | if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") { | |
211694e5 SS |
627 | # Exit submodule. Process remaining script. |
628 | return; | |
629 | } | |
630 | ||
c69c8200 MT |
631 | # Only check the RED interface |
632 | if ($defaultNetworks{'RED_DEV'} ne "") { | |
633 | run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN"); | |
634 | } | |
635 | ||
636 | # Do not check any private address space | |
637 | foreach my $network (@PRIVATE_NETWORKS) { | |
638 | run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN"); | |
639 | } | |
640 | ||
5730a5bc SS |
641 | # Loop through all supported locations and |
642 | # create iptables rules, if blocking for this country | |
211694e5 SS |
643 | # is enabled. |
644 | foreach my $location (@locations) { | |
5730a5bc | 645 | if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") { |
0e6eca78 | 646 | run("$IPTABLES -A LOCATIONBLOCK -m geoip --src-cc $location -j DROP"); |
211694e5 SS |
647 | } |
648 | } | |
649 | } | |
650 | ||
8f4f4634 MT |
651 | sub get_protocols { |
652 | my $hash = shift; | |
653 | my $key = shift; | |
654 | ||
655 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
656 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
657 | ||
658 | my @protocols = (); | |
659 | ||
660 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
661 | if (!$uses_source_ports && !$uses_services) { | |
662 | push(@protocols, $$hash{$key}[8]); | |
663 | ||
664 | # Rules which either use ports or services. | |
665 | } elsif ($uses_source_ports || $uses_services) { | |
666 | # Check if service group or service | |
667 | if ($$hash{$key}[14] eq 'cust_srv') { | |
668 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
669 | ||
670 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
671 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
672 | push(@protocols, split(",", $protos)); | |
673 | ||
674 | } else { | |
675 | # Fetch the protocol for this rule. | |
676 | my $protocol = lc($$hash{$key}[8]); | |
677 | ||
678 | # Fetch source and destination ports for this rule. | |
679 | my $source_ports = $$hash{$key}[10]; | |
680 | my $destination_ports = $$hash{$key}[15]; | |
681 | ||
682 | # Check if ports are set for protocols which do not support ports. | |
683 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
684 | print_error("$protocol does not support ports"); | |
685 | return (); | |
686 | } | |
687 | ||
688 | push(@protocols, $protocol); | |
2a81ab0d AM |
689 | } |
690 | } | |
8f4f4634 MT |
691 | |
692 | # Remove all empty elements | |
693 | @protocols = map { $_ ? $_ : () } @protocols; | |
694 | ||
695 | # If no protocol has been defined, we assume "all". | |
696 | if (!@protocols) { | |
697 | push(@protocols, "all"); | |
98cee89f | 698 | } |
8f4f4634 MT |
699 | |
700 | # Make all protocol names lowercase. | |
701 | @protocols = map { lc } @protocols; | |
702 | ||
703 | return @protocols; | |
2a81ab0d | 704 | } |
97ab0569 | 705 | |
8f4f4634 MT |
706 | sub get_protocol_options { |
707 | my $hash = shift; | |
708 | my $key = shift; | |
709 | my $protocol = shift; | |
d7a14d01 | 710 | my $nat_options_wanted = shift; |
8f4f4634 MT |
711 | my @options = (); |
712 | ||
d7a14d01 MT |
713 | # Nothing to do if no protocol is specified. |
714 | if ($protocol eq "all") { | |
715 | return @options; | |
716 | } else { | |
717 | push(@options, ("-p", $protocol)); | |
718 | } | |
719 | ||
fcc68a42 MT |
720 | if ($protocol ~~ @PROTOCOLS_WITH_PORTS) { |
721 | # Process source ports. | |
722 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
723 | my $src_ports = $$hash{$key}[10]; | |
8f4f4634 | 724 | |
fcc68a42 MT |
725 | if ($use_src_ports && $src_ports) { |
726 | push(@options, &format_ports($src_ports, "src")); | |
727 | } | |
8f4f4634 | 728 | |
fcc68a42 MT |
729 | # Process destination ports. |
730 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
731 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
8f4f4634 | 732 | |
fcc68a42 MT |
733 | if ($use_dst_ports) { |
734 | my $dst_ports_mode = $$hash{$key}[14]; | |
735 | my $dst_ports = $$hash{$key}[15]; | |
8f4f4634 | 736 | |
fcc68a42 MT |
737 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { |
738 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
739 | $dst_ports = $$hash{$key}[30]; | |
740 | } | |
8f4f4634 | 741 | push(@options, &format_ports($dst_ports, "dst")); |
8f4f4634 | 742 | |
fcc68a42 MT |
743 | } elsif ($dst_ports_mode eq "cust_srv") { |
744 | if ($protocol eq "ICMP") { | |
745 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
746 | } else { | |
747 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
748 | push(@options, &format_ports($dst_ports, "dst")); | |
749 | } | |
750 | ||
751 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
752 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
753 | } | |
2a81ab0d AM |
754 | } |
755 | } | |
8f4f4634 MT |
756 | |
757 | # Check if a single ICMP type is selected. | |
fcc68a42 | 758 | if ($protocol eq "icmp") { |
8f4f4634 MT |
759 | my $icmp_type = $$hash{$key}[9]; |
760 | ||
761 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
762 | push(@options, ("--icmp-type", $icmp_type)); | |
a4c7bf6b AM |
763 | } |
764 | } | |
8f4f4634 MT |
765 | |
766 | return @options; | |
767 | } | |
768 | ||
769 | sub format_ports { | |
770 | my $ports = shift; | |
771 | my $type = shift; | |
772 | ||
773 | my $arg; | |
774 | if ($type eq "src") { | |
775 | $arg = "--sport"; | |
776 | } elsif ($type eq "dst") { | |
777 | $arg = "--dport"; | |
778 | } | |
779 | ||
780 | my @options = (); | |
781 | ||
782 | if ($ports =~ /\|/) { | |
783 | $ports =~ s/\|/,/g; | |
784 | push(@options, ("-m", "multiport")); | |
785 | } | |
786 | ||
1c3044d7 MT |
787 | if ($ports) { |
788 | push(@options, ($arg, $ports)); | |
789 | } | |
8f4f4634 MT |
790 | |
791 | return @options; | |
792 | } | |
793 | ||
794 | sub get_dnat_target_port { | |
795 | my $hash = shift; | |
796 | my $key = shift; | |
797 | ||
798 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
1c3044d7 MT |
799 | my $port = $$hash{$key}[15]; |
800 | my $external_port = $$hash{$key}[30]; | |
801 | ||
802 | if ($external_port && ($port ne $external_port)) { | |
803 | return $$hash{$key}[15]; | |
804 | } | |
8f4f4634 | 805 | } |
2a81ab0d | 806 | } |
6e87f0aa MT |
807 | |
808 | sub add_dnat_mangle_rules { | |
809 | my $nat_address = shift; | |
48f07c19 | 810 | my $interface = shift; |
6e87f0aa MT |
811 | my @options = @_; |
812 | ||
813 | my $mark = 0; | |
814 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { | |
815 | $mark++; | |
816 | ||
817 | # Skip rule if not all required information exists. | |
818 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
819 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
820 | ||
48f07c19 AM |
821 | next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"}); |
822 | ||
6e87f0aa MT |
823 | my @mangle_options = @options; |
824 | ||
825 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
826 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
827 | ||
828 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
829 | push(@mangle_options, ("-j", "MARK", "--set-mark", $mark)); | |
830 | ||
831 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
832 | } | |
833 | } | |
3bb4bb3f MT |
834 | |
835 | sub make_log_limit_options { | |
836 | my @options = ("-m", "limit"); | |
837 | ||
838 | # Maybe we should get this from the configuration. | |
839 | my $limit = 10; | |
840 | ||
a85a7a60 | 841 | # We limit log messages to $limit messages per second. |
842 | push(@options, ("--limit", "$limit/second")); | |
3bb4bb3f MT |
843 | |
844 | # And we allow bursts of 2x $limit. | |
845 | push(@options, ("--limit-burst", $limit * 2)); | |
846 | ||
847 | return @options; | |
848 | } | |
e9b5ba41 | 849 | |
da7a2208 MT |
850 | sub firewall_is_in_subnet { |
851 | my $subnet = shift; | |
5cf8c8c1 | 852 | |
e9b5ba41 MT |
853 | # ORANGE is missing here, because nothing may ever access |
854 | # the firewall from this network. | |
4e54e3c6 | 855 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); |
e9b5ba41 | 856 | |
da7a2208 MT |
857 | if ($address) { |
858 | return 1; | |
e9b5ba41 | 859 | } |
da7a2208 MT |
860 | |
861 | return 0; | |
e9b5ba41 | 862 | } |