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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 SS |
72 | ); |
73 | ||
36196d0d | 74 | my @p2ps=(); |
2a81ab0d | 75 | |
6d8eb5de AM |
76 | my $configfwdfw = "${General::swroot}/firewall/config"; |
77 | my $configinput = "${General::swroot}/firewall/input"; | |
78 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
79 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
5730a5bc | 80 | my $locationfile = "${General::swroot}/firewall/locationblock"; |
2a81ab0d | 81 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 82 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 83 | |
6d8eb5de | 84 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 85 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 86 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
87 | &General::readhasharray($configfwdfw, \%configfwdfw); |
88 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 89 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 90 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 91 | |
5730a5bc SS |
92 | # Check if the location settings file exists |
93 | if (-e "$locationfile") { | |
f5ad4246 | 94 | # Read settings file |
5730a5bc | 95 | &General::readhash("$locationfile", \%locationsettings); |
f5ad4246 SS |
96 | } |
97 | ||
5730a5bc SS |
98 | # Get all available locations. |
99 | my @locations = &Location::Functions::get_locations(); | |
f5ad4246 | 100 | |
3bb4bb3f MT |
101 | my @log_limit_options = &make_log_limit_options(); |
102 | ||
aa5f4b65 MT |
103 | my $POLICY_INPUT_ALLOWED = 0; |
104 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
105 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
106 | ||
107 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
108 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
109 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
110 | ||
8531b94a MT |
111 | # MAIN |
112 | &main(); | |
113 | ||
114 | sub main { | |
115 | # Flush all chains. | |
116 | &flush(); | |
117 | ||
3d886880 SS |
118 | # Destroy all existing ipsets. |
119 | run("$IPSET destroy"); | |
120 | ||
2d0c7a9f AM |
121 | # Prepare firewall rules. |
122 | if (! -z "${General::swroot}/firewall/input"){ | |
123 | &buildrules(\%configinputfw); | |
124 | } | |
125 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
126 | &buildrules(\%configoutgoingfw); | |
127 | } | |
128 | if (! -z "${General::swroot}/firewall/config"){ | |
129 | &buildrules(\%configfwdfw); | |
130 | } | |
8531b94a MT |
131 | |
132 | # Load P2P block rules. | |
133 | &p2pblock(); | |
134 | ||
5730a5bc SS |
135 | # Load Location block rules. |
136 | &locationblock(); | |
211694e5 | 137 | |
8531b94a MT |
138 | # Reload firewall policy. |
139 | run("/usr/sbin/firewall-policy"); | |
2d0c7a9f AM |
140 | |
141 | #Reload firewall.local if present | |
142 | if ( -f '/etc/sysconfig/firewall.local'){ | |
143 | run("/etc/sysconfig/firewall.local reload"); | |
144 | } | |
2a81ab0d | 145 | } |
97ab0569 | 146 | |
68d1eb10 MT |
147 | sub run { |
148 | # Executes or prints the given shell command. | |
149 | my $command = shift; | |
150 | ||
151 | if ($DEBUG) { | |
152 | print "$command\n"; | |
153 | } else { | |
154 | system "$command"; | |
6e87f0aa MT |
155 | |
156 | if ($?) { | |
157 | print_error("ERROR: $command"); | |
158 | } | |
68d1eb10 MT |
159 | } |
160 | } | |
161 | ||
6178953b MT |
162 | sub print_error { |
163 | my $message = shift; | |
164 | ||
165 | print STDERR "$message\n"; | |
166 | } | |
167 | ||
8f4f4634 MT |
168 | sub print_rule { |
169 | my $hash = shift; | |
170 | ||
171 | print "\nRULE:"; | |
172 | ||
173 | my $i = 0; | |
174 | foreach (@$hash) { | |
175 | printf(" %2d: %s", $i++, $_); | |
176 | } | |
177 | print "\n"; | |
178 | } | |
179 | ||
791c2b45 MT |
180 | sub count_elements { |
181 | my $hash = shift; | |
182 | ||
183 | return scalar @$hash; | |
184 | } | |
185 | ||
97ab0569 | 186 | sub flush { |
d98aa95a MT |
187 | run("$IPTABLES -F $CHAIN_INPUT"); |
188 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
189 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
190 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
191 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 192 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
bbeb2a50 SS |
193 | |
194 | # Flush LOCATIONBLOCK chain. | |
195 | run("$IPTABLES -F LOCATIONBLOCK"); | |
86a921ee | 196 | } |
97ab0569 | 197 | |
97ab0569 | 198 | sub buildrules { |
8f4f4634 MT |
199 | my $hash = shift; |
200 | ||
aa5f4b65 MT |
201 | # Search for targets that need to be specially handled when adding |
202 | # forwarding rules. Additional rules will automatically get inserted | |
203 | # into the INPUT/OUTPUT chains for these targets. | |
204 | my @special_input_targets = (); | |
205 | if (!$POLICY_FORWARD_ALLOWED) { | |
206 | push(@special_input_targets, "ACCEPT"); | |
207 | } | |
208 | ||
209 | if ($POLICY_INPUT_ACTION eq "DROP") { | |
ae93dd3d | 210 | push(@special_input_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 211 | } elsif ($POLICY_INPUT_ACTION eq "REJECT") { |
ae93dd3d | 212 | push(@special_input_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
213 | } |
214 | ||
215 | my @special_output_targets = (); | |
216 | if ($POLICY_OUTPUT_ALLOWED) { | |
217 | push(@special_output_targets, ("DROP", "REJECT")); | |
218 | } else { | |
219 | push(@special_output_targets, "ACCEPT"); | |
220 | ||
221 | if ($POLICY_OUTPUT_ACTION eq "DROP") { | |
ae93dd3d | 222 | push(@special_output_targets, ("ACCEPT", "REJECT")); |
aa5f4b65 | 223 | } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") { |
ae93dd3d | 224 | push(@special_output_targets, ("ACCEPT", "DROP")); |
aa5f4b65 MT |
225 | } |
226 | } | |
227 | ||
8f4f4634 MT |
228 | foreach my $key (sort {$a <=> $b} keys %$hash) { |
229 | # Skip disabled rules. | |
230 | next unless ($$hash{$key}[2] eq 'ON'); | |
231 | ||
791c2b45 MT |
232 | # Count number of elements in this line |
233 | my $elements = &count_elements($$hash{$key}); | |
234 | ||
8f4f4634 MT |
235 | if ($DEBUG) { |
236 | print_rule($$hash{$key}); | |
237 | } | |
238 | ||
239 | # Check if the target is valid. | |
240 | my $target = $$hash{$key}[0]; | |
241 | if (!$target ~~ @VALID_TARGETS) { | |
242 | print_error("Invalid target '$target' for rule $key"); | |
243 | next; | |
244 | } | |
245 | ||
246 | # Check if the chain is valid. | |
247 | my $chain = $$hash{$key}[1]; | |
248 | if (!$chain ~~ @VALID_CHAINS) { | |
249 | print_error("Invalid chain '$chain' in rule $key"); | |
250 | next; | |
251 | } | |
252 | ||
253 | # Collect all sources. | |
4e54e3c6 | 254 | my @sources = &fwlib::get_addresses($hash, $key, "src"); |
8f4f4634 MT |
255 | |
256 | # Collect all destinations. | |
4e54e3c6 | 257 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); |
6178953b | 258 | |
c0ce9206 MT |
259 | # True if the destination is the firewall itself. |
260 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
261 | ||
6178953b | 262 | # Check if logging should be enabled. |
8f4f4634 | 263 | my $LOG = ($$hash{$key}[17] eq 'ON'); |
6178953b | 264 | |
8f4f4634 MT |
265 | # Check if NAT is enabled and initialize variables, that we use for that. |
266 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
6178953b | 267 | my $NAT_MODE; |
8f4f4634 MT |
268 | if ($NAT) { |
269 | $NAT_MODE = uc($$hash{$key}[31]); | |
270 | } | |
6178953b | 271 | |
8f4f4634 MT |
272 | # Set up time constraints. |
273 | my @time_options = (); | |
274 | if ($$hash{$key}[18] eq 'ON') { | |
275 | push(@time_options, ("-m", "time")); | |
6178953b | 276 | |
8f4f4634 MT |
277 | # Select all days of the week this match is active. |
278 | my @weekdays = (); | |
279 | if ($$hash{$key}[19] ne '') { | |
280 | push (@weekdays, "Mon"); | |
281 | } | |
282 | if ($$hash{$key}[20] ne '') { | |
283 | push (@weekdays, "Tue"); | |
284 | } | |
285 | if ($$hash{$key}[21] ne '') { | |
286 | push (@weekdays, "Wed"); | |
287 | } | |
288 | if ($$hash{$key}[22] ne '') { | |
289 | push (@weekdays, "Thu"); | |
290 | } | |
291 | if ($$hash{$key}[23] ne '') { | |
292 | push (@weekdays, "Fri"); | |
293 | } | |
294 | if ($$hash{$key}[24] ne '') { | |
295 | push (@weekdays, "Sat"); | |
296 | } | |
297 | if ($$hash{$key}[25] ne '') { | |
298 | push (@weekdays, "Sun"); | |
299 | } | |
300 | if (@weekdays) { | |
301 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
302 | } | |
6178953b | 303 | |
8f4f4634 MT |
304 | # Convert start time. |
305 | my $time_start = &format_time($$hash{$key}[26]); | |
306 | if ($time_start) { | |
307 | push(@time_options, ("--timestart", $time_start)); | |
a6edca5a | 308 | } |
6178953b | 309 | |
8f4f4634 MT |
310 | # Convert end time. |
311 | my $time_stop = &format_time($$hash{$key}[27]); | |
312 | if ($time_stop) { | |
313 | push(@time_options, ("--timestop", $time_stop)); | |
314 | } | |
a6edca5a | 315 | } |
6178953b | 316 | |
d2793ea8 AM |
317 | # Concurrent connection limit |
318 | my @ratelimit_options = (); | |
791c2b45 | 319 | |
d840d02a | 320 | if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) { |
d2793ea8 AM |
321 | my $conn_limit = $$hash{$key}[33]; |
322 | ||
323 | if ($conn_limit ge 1) { | |
324 | push(@ratelimit_options, ("-m", "connlimit")); | |
325 | ||
326 | # Use the the entire source IP address | |
327 | push(@ratelimit_options, "--connlimit-saddr"); | |
328 | push(@ratelimit_options, ("--connlimit-mask", "32")); | |
329 | ||
330 | # Apply the limit | |
331 | push(@ratelimit_options, ("--connlimit-upto", $conn_limit)); | |
332 | } | |
333 | } | |
334 | ||
335 | # Ratelimit | |
d840d02a | 336 | if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) { |
d2793ea8 AM |
337 | my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]"; |
338 | ||
d840d02a MT |
339 | if ($rate_limit) { |
340 | push(@ratelimit_options, ("-m", "limit")); | |
341 | push(@ratelimit_options, ("--limit", $rate_limit)); | |
342 | } | |
d2793ea8 AM |
343 | } |
344 | ||
8f4f4634 MT |
345 | # Check which protocols are used in this rule and so that we can |
346 | # later group rules by protocols. | |
347 | my @protocols = &get_protocols($hash, $key); | |
348 | if (!@protocols) { | |
349 | print_error("Invalid protocol configuration for rule $key"); | |
350 | next; | |
351 | } | |
352 | ||
353 | foreach my $protocol (@protocols) { | |
354 | # Check if the given protocol is supported. | |
355 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
356 | print_error("Protocol $protocol is not supported (rule $key)"); | |
357 | next; | |
2a81ab0d | 358 | } |
8f4f4634 MT |
359 | |
360 | # Prepare protocol options (like ICMP types, ports, etc...). | |
d7a14d01 | 361 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); |
8f4f4634 MT |
362 | |
363 | # Check if this protocol knows ports. | |
364 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
365 | ||
02574191 MT |
366 | foreach my $src (@sources) { |
367 | # Skip invalid source. | |
4e9a2b57 | 368 | next unless (defined $src); |
02574191 | 369 | next unless ($src); |
8f4f4634 | 370 | |
02574191 | 371 | # Sanitize source. |
48f07c19 | 372 | my $source = @$src[0]; |
02574191 MT |
373 | if ($source ~~ @ANY_ADDRESSES) { |
374 | $source = ""; | |
375 | } | |
376 | ||
48f07c19 AM |
377 | my $source_intf = @$src[1]; |
378 | ||
02574191 MT |
379 | foreach my $dst (@destinations) { |
380 | # Skip invalid rules. | |
4e9a2b57 | 381 | next unless (defined $dst); |
02574191 | 382 | next if (!$dst || ($dst eq "none")); |
c2a1af75 MT |
383 | |
384 | # Sanitize destination. | |
48f07c19 | 385 | my $destination = @$dst[0]; |
c2a1af75 MT |
386 | if ($destination ~~ @ANY_ADDRESSES) { |
387 | $destination = ""; | |
388 | } | |
389 | ||
48f07c19 AM |
390 | my $destination_intf = @$dst[1]; |
391 | ||
8f4f4634 MT |
392 | # Array with iptables arguments. |
393 | my @options = (); | |
394 | ||
395 | # Append protocol. | |
396 | if ($protocol ne "all") { | |
8f4f4634 | 397 | push(@options, @protocol_options); |
2a81ab0d | 398 | } |
8f4f4634 | 399 | |
6e87f0aa MT |
400 | # Prepare source options. |
401 | my @source_options = (); | |
8f4f4634 | 402 | if ($source =~ /mac/) { |
6e87f0aa | 403 | push(@source_options, $source); |
b9ca2fa6 AM |
404 | } elsif ($source =~ /-m geoip/) { |
405 | push(@source_options, $source); | |
406 | } elsif($source) { | |
6e87f0aa | 407 | push(@source_options, ("-s", $source)); |
2a81ab0d | 408 | } |
14f7cb87 | 409 | |
6e87f0aa | 410 | # Prepare destination options. |
c2a1af75 | 411 | my @destination_options = (); |
b9ca2fa6 AM |
412 | if ($destination =~ /-m geoip/) { |
413 | push(@destination_options, $destination); | |
414 | } elsif ($destination) { | |
c2a1af75 MT |
415 | push(@destination_options, ("-d", $destination)); |
416 | } | |
14f7cb87 | 417 | |
249839b0 MT |
418 | # Add source and destination interface to the filter rules. |
419 | # These are supposed to help filtering forged packets that originate | |
420 | # from BLUE with an IP address from GREEN for instance. | |
421 | my @source_intf_options = (); | |
422 | if ($source_intf) { | |
423 | push(@source_intf_options, ("-i", $source_intf)); | |
424 | } | |
425 | ||
426 | my @destination_intf_options = (); | |
427 | if ($destination_intf) { | |
428 | push(@destination_intf_options, ("-o", $destination_intf)); | |
429 | } | |
430 | ||
8f4f4634 MT |
431 | # Add time constraint options. |
432 | push(@options, @time_options); | |
14f7cb87 | 433 | |
d2793ea8 AM |
434 | # Add ratelimiting option |
435 | push(@options, @ratelimit_options); | |
436 | ||
aa5f4b65 | 437 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 438 | if ($source) { |
da7a2208 | 439 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
440 | } |
441 | ||
aa5f4b65 MT |
442 | my $firewall_is_in_destination_subnet = 1; |
443 | if ($destination) { | |
444 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
445 | } | |
446 | ||
8f4f4634 MT |
447 | # Process NAT rules. |
448 | if ($NAT) { | |
4e54e3c6 | 449 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 450 | |
8f4f4634 MT |
451 | # Skip NAT rules if the NAT address is unknown |
452 | # (i.e. no internet connection has been established, yet). | |
453 | next unless ($nat_address); | |
b05ec50a | 454 | |
8f4f4634 MT |
455 | # Destination NAT |
456 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
457 | my @nat_options = (); |
458 | if ($protocol ne "all") { | |
459 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
460 | push(@nat_options, @nat_protocol_options); | |
461 | } | |
21b37391 SS |
462 | |
463 | # Add time options. | |
ff7cb6d6 MT |
464 | push(@nat_options, @time_options); |
465 | ||
21b37391 SS |
466 | # Determine if a REDIRECT rule should be created. |
467 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports); | |
468 | ||
ff7cb6d6 | 469 | # Make port-forwardings useable from the internal networks. |
21b37391 SS |
470 | if (!$use_redirect) { |
471 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
472 | unless ($nat_address ~~ @internal_addresses) { | |
473 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); | |
474 | } | |
ff7cb6d6 MT |
475 | } |
476 | ||
21b37391 | 477 | # Add source options. |
6e87f0aa | 478 | push(@nat_options, @source_options); |
21b37391 SS |
479 | |
480 | # Add NAT address. | |
481 | if (!$use_redirect) { | |
482 | push(@nat_options, ("-d", $nat_address)); | |
483 | } | |
6e87f0aa | 484 | |
c0ce9206 | 485 | my $dnat_port; |
8f4f4634 | 486 | if ($protocol_has_ports) { |
c0ce9206 MT |
487 | $dnat_port = &get_dnat_target_port($hash, $key); |
488 | } | |
489 | ||
490 | my @nat_action_options = (); | |
b05ec50a | 491 | |
c0ce9206 | 492 | # Use iptables REDIRECT |
c0ce9206 | 493 | if ($use_redirect) { |
21b37391 SS |
494 | push(@nat_action_options, ("-j", "REDIRECT")); |
495 | ||
496 | # Redirect to specified port if one has given. | |
497 | if ($dnat_port) { | |
498 | push(@nat_action_options, ("--to-ports", $dnat_port)); | |
499 | } | |
c0ce9206 MT |
500 | |
501 | # Use iptables DNAT | |
502 | } else { | |
f98bb538 MT |
503 | if ($destination_is_firewall && !$destination) { |
504 | $destination = &fwlib::get_external_address(); | |
505 | } | |
506 | next unless ($destination); | |
507 | ||
c0ce9206 MT |
508 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
509 | @destination_options = ("-d", $dnat_address); | |
510 | ||
511 | if ($protocol_has_ports) { | |
512 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
513 | ||
514 | if ($dnat_port) { | |
515 | $dnat_address .= ":$dnat_port"; | |
516 | } | |
86a921ee | 517 | } |
c0ce9206 MT |
518 | |
519 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 520 | } |
8f4f4634 MT |
521 | |
522 | if ($LOG) { | |
3bb4bb3f | 523 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 524 | } |
c0ce9206 | 525 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
526 | |
527 | # Source NAT | |
528 | } elsif ($NAT_MODE eq "SNAT") { | |
c4b7692a | 529 | my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" ); |
6e87f0aa MT |
530 | my @nat_options = @options; |
531 | ||
c4b7692a SS |
532 | # Get addresses for the configured firewall interfaces. |
533 | my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
534 | ||
535 | # Check if the nat_address is one of the local addresses. | |
536 | foreach my $local_address (@local_addresses) { | |
537 | if ($nat_address eq $local_address) { | |
538 | # Clear SNAT options. | |
539 | @snat_options = (); | |
540 | ||
541 | # Finish loop. | |
542 | last; | |
543 | } | |
544 | } | |
545 | ||
249839b0 | 546 | push(@nat_options, @destination_intf_options); |
6e87f0aa MT |
547 | push(@nat_options, @source_options); |
548 | push(@nat_options, @destination_options); | |
549 | ||
8f4f4634 | 550 | if ($LOG) { |
c4b7692a | 551 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 552 | } |
c4b7692a | 553 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
554 | } |
555 | } | |
8f4f4634 | 556 | |
6e87f0aa MT |
557 | push(@options, @source_options); |
558 | push(@options, @destination_options); | |
559 | ||
8f4f4634 | 560 | # Insert firewall rule. |
c22369a9 | 561 | if ($LOG) { |
249839b0 | 562 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 | 563 | } |
249839b0 | 564 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target"); |
aa5f4b65 MT |
565 | |
566 | # Handle forwarding rules and add corresponding rules for firewall access. | |
567 | if ($chain eq $CHAIN_FORWARD) { | |
568 | # If the firewall is part of the destination subnet and access to the destination network | |
569 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
570 | # for the firewall, too. | |
571 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
c22369a9 | 572 | if ($LOG) { |
249839b0 | 573 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); |
aa5f4b65 | 574 | } |
249839b0 | 575 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target"); |
aa5f4b65 MT |
576 | } |
577 | ||
578 | # Likewise. | |
579 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
c22369a9 | 580 | if ($LOG) { |
249839b0 | 581 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); |
aa5f4b65 | 582 | } |
249839b0 | 583 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target"); |
aa5f4b65 MT |
584 | } |
585 | } | |
2a81ab0d AM |
586 | } |
587 | } | |
588 | } | |
2a81ab0d AM |
589 | } |
590 | } | |
97ab0569 | 591 | |
b05ec50a MT |
592 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
593 | sub format_time { | |
594 | my $val = shift; | |
595 | ||
596 | # Convert the given time into minutes. | |
597 | my $minutes = &time_convert_to_minutes($val); | |
598 | ||
599 | # Move the timestamp into UTC. | |
600 | $minutes += &time_utc_offset(); | |
601 | ||
602 | # Make sure $minutes is between 00:00 and 23:59. | |
603 | if ($minutes < 0) { | |
604 | $minutes += 1440; | |
605 | } | |
606 | ||
607 | if ($minutes > 1440) { | |
608 | $minutes -= 1440; | |
609 | } | |
610 | ||
611 | # Format as hh:mm. | |
612 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 613 | } |
97ab0569 | 614 | |
b05ec50a MT |
615 | # Calculates the offsets in minutes from the local timezone to UTC. |
616 | sub time_utc_offset { | |
617 | my @localtime = localtime(time); | |
618 | my @gmtime = gmtime(time); | |
619 | ||
620 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 621 | } |
97ab0569 | 622 | |
b05ec50a MT |
623 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
624 | sub time_convert_to_minutes { | |
625 | my ($hrs, $min) = split(":", shift); | |
626 | ||
627 | return ($hrs * 60) + $min; | |
472136c9 | 628 | } |
97ab0569 MT |
629 | |
630 | sub p2pblock { | |
766c2f60 MT |
631 | open(FILE, "<$p2pfile") or die "Unable to read $p2pfile"; |
632 | my @protocols = (); | |
633 | foreach my $p2pentry (<FILE>) { | |
634 | my @p2pline = split(/\;/, $p2pentry); | |
2a5b19c5 | 635 | next unless ($p2pline[2] eq "off"); |
766c2f60 MT |
636 | |
637 | push(@protocols, "--$p2pline[1]"); | |
36196d0d | 638 | } |
766c2f60 | 639 | close(FILE); |
68d1eb10 | 640 | |
24d36c80 | 641 | run("$IPTABLES -F P2PBLOCK"); |
766c2f60 | 642 | if (@protocols) { |
2a5b19c5 | 643 | run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP"); |
36196d0d AM |
644 | } |
645 | } | |
97ab0569 | 646 | |
5730a5bc | 647 | sub locationblock { |
bbeb2a50 | 648 | # The LOCATIONBLOCK chain now gets flushed by the flush() function. |
211694e5 | 649 | |
5730a5bc SS |
650 | # If location blocking is not enabled, we are finished here. |
651 | if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") { | |
211694e5 SS |
652 | # Exit submodule. Process remaining script. |
653 | return; | |
654 | } | |
655 | ||
2293e1de PM |
656 | # Only check the RED interface, which is ppp0 in case of RED_TYPE being |
657 | # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise. | |
658 | if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") { | |
659 | run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN"); | |
660 | } elsif ($defaultNetworks{'RED_DEV'} ne "") { | |
c69c8200 MT |
661 | run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN"); |
662 | } | |
663 | ||
664 | # Do not check any private address space | |
665 | foreach my $network (@PRIVATE_NETWORKS) { | |
666 | run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN"); | |
667 | } | |
668 | ||
5730a5bc SS |
669 | # Loop through all supported locations and |
670 | # create iptables rules, if blocking for this country | |
211694e5 SS |
671 | # is enabled. |
672 | foreach my $location (@locations) { | |
5730a5bc | 673 | if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") { |
0e6eca78 | 674 | run("$IPTABLES -A LOCATIONBLOCK -m geoip --src-cc $location -j DROP"); |
211694e5 SS |
675 | } |
676 | } | |
677 | } | |
678 | ||
8f4f4634 MT |
679 | sub get_protocols { |
680 | my $hash = shift; | |
681 | my $key = shift; | |
682 | ||
683 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
684 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
685 | ||
686 | my @protocols = (); | |
687 | ||
688 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
689 | if (!$uses_source_ports && !$uses_services) { | |
690 | push(@protocols, $$hash{$key}[8]); | |
691 | ||
692 | # Rules which either use ports or services. | |
693 | } elsif ($uses_source_ports || $uses_services) { | |
694 | # Check if service group or service | |
695 | if ($$hash{$key}[14] eq 'cust_srv') { | |
696 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
697 | ||
698 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
699 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
700 | push(@protocols, split(",", $protos)); | |
701 | ||
702 | } else { | |
703 | # Fetch the protocol for this rule. | |
704 | my $protocol = lc($$hash{$key}[8]); | |
705 | ||
706 | # Fetch source and destination ports for this rule. | |
707 | my $source_ports = $$hash{$key}[10]; | |
708 | my $destination_ports = $$hash{$key}[15]; | |
709 | ||
710 | # Check if ports are set for protocols which do not support ports. | |
711 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
712 | print_error("$protocol does not support ports"); | |
713 | return (); | |
714 | } | |
715 | ||
716 | push(@protocols, $protocol); | |
2a81ab0d AM |
717 | } |
718 | } | |
8f4f4634 MT |
719 | |
720 | # Remove all empty elements | |
721 | @protocols = map { $_ ? $_ : () } @protocols; | |
722 | ||
723 | # If no protocol has been defined, we assume "all". | |
724 | if (!@protocols) { | |
725 | push(@protocols, "all"); | |
98cee89f | 726 | } |
8f4f4634 MT |
727 | |
728 | # Make all protocol names lowercase. | |
729 | @protocols = map { lc } @protocols; | |
730 | ||
731 | return @protocols; | |
2a81ab0d | 732 | } |
97ab0569 | 733 | |
8f4f4634 MT |
734 | sub get_protocol_options { |
735 | my $hash = shift; | |
736 | my $key = shift; | |
737 | my $protocol = shift; | |
d7a14d01 | 738 | my $nat_options_wanted = shift; |
8f4f4634 MT |
739 | my @options = (); |
740 | ||
d7a14d01 MT |
741 | # Nothing to do if no protocol is specified. |
742 | if ($protocol eq "all") { | |
743 | return @options; | |
744 | } else { | |
745 | push(@options, ("-p", $protocol)); | |
746 | } | |
747 | ||
fcc68a42 MT |
748 | if ($protocol ~~ @PROTOCOLS_WITH_PORTS) { |
749 | # Process source ports. | |
750 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
751 | my $src_ports = $$hash{$key}[10]; | |
8f4f4634 | 752 | |
fcc68a42 MT |
753 | if ($use_src_ports && $src_ports) { |
754 | push(@options, &format_ports($src_ports, "src")); | |
755 | } | |
8f4f4634 | 756 | |
fcc68a42 MT |
757 | # Process destination ports. |
758 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
759 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
8f4f4634 | 760 | |
fcc68a42 MT |
761 | if ($use_dst_ports) { |
762 | my $dst_ports_mode = $$hash{$key}[14]; | |
763 | my $dst_ports = $$hash{$key}[15]; | |
8f4f4634 | 764 | |
fcc68a42 MT |
765 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { |
766 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
767 | $dst_ports = $$hash{$key}[30]; | |
768 | } | |
8f4f4634 | 769 | push(@options, &format_ports($dst_ports, "dst")); |
8f4f4634 | 770 | |
fcc68a42 MT |
771 | } elsif ($dst_ports_mode eq "cust_srv") { |
772 | if ($protocol eq "ICMP") { | |
773 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
774 | } else { | |
775 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
776 | push(@options, &format_ports($dst_ports, "dst")); | |
777 | } | |
778 | ||
779 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
780 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
781 | } | |
2a81ab0d AM |
782 | } |
783 | } | |
8f4f4634 MT |
784 | |
785 | # Check if a single ICMP type is selected. | |
fcc68a42 | 786 | if ($protocol eq "icmp") { |
8f4f4634 MT |
787 | my $icmp_type = $$hash{$key}[9]; |
788 | ||
789 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
790 | push(@options, ("--icmp-type", $icmp_type)); | |
a4c7bf6b AM |
791 | } |
792 | } | |
8f4f4634 MT |
793 | |
794 | return @options; | |
795 | } | |
796 | ||
797 | sub format_ports { | |
798 | my $ports = shift; | |
799 | my $type = shift; | |
800 | ||
801 | my $arg; | |
802 | if ($type eq "src") { | |
803 | $arg = "--sport"; | |
804 | } elsif ($type eq "dst") { | |
805 | $arg = "--dport"; | |
806 | } | |
807 | ||
808 | my @options = (); | |
809 | ||
810 | if ($ports =~ /\|/) { | |
811 | $ports =~ s/\|/,/g; | |
812 | push(@options, ("-m", "multiport")); | |
813 | } | |
814 | ||
1c3044d7 MT |
815 | if ($ports) { |
816 | push(@options, ($arg, $ports)); | |
817 | } | |
8f4f4634 MT |
818 | |
819 | return @options; | |
820 | } | |
821 | ||
822 | sub get_dnat_target_port { | |
823 | my $hash = shift; | |
824 | my $key = shift; | |
825 | ||
826 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
1c3044d7 MT |
827 | my $port = $$hash{$key}[15]; |
828 | my $external_port = $$hash{$key}[30]; | |
829 | ||
830 | if ($external_port && ($port ne $external_port)) { | |
831 | return $$hash{$key}[15]; | |
832 | } | |
8f4f4634 | 833 | } |
2a81ab0d | 834 | } |
6e87f0aa MT |
835 | |
836 | sub add_dnat_mangle_rules { | |
837 | my $nat_address = shift; | |
48f07c19 | 838 | my $interface = shift; |
6e87f0aa MT |
839 | my @options = @_; |
840 | ||
ce31144c | 841 | my $mark = 0x01000000; |
6e87f0aa | 842 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { |
6e87f0aa MT |
843 | # Skip rule if not all required information exists. |
844 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
845 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
846 | ||
48f07c19 AM |
847 | next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"}); |
848 | ||
6e87f0aa MT |
849 | my @mangle_options = @options; |
850 | ||
851 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
852 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
853 | ||
854 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
ce31144c | 855 | push(@mangle_options, ("-j", "MARK", "--set-xmark", "$mark/$NAT_MASK")); |
6e87f0aa MT |
856 | |
857 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
ce31144c MT |
858 | |
859 | $mark <<= 1; | |
6e87f0aa MT |
860 | } |
861 | } | |
3bb4bb3f MT |
862 | |
863 | sub make_log_limit_options { | |
864 | my @options = ("-m", "limit"); | |
865 | ||
866 | # Maybe we should get this from the configuration. | |
867 | my $limit = 10; | |
868 | ||
a85a7a60 | 869 | # We limit log messages to $limit messages per second. |
870 | push(@options, ("--limit", "$limit/second")); | |
3bb4bb3f MT |
871 | |
872 | # And we allow bursts of 2x $limit. | |
873 | push(@options, ("--limit-burst", $limit * 2)); | |
874 | ||
875 | return @options; | |
876 | } | |
e9b5ba41 | 877 | |
da7a2208 MT |
878 | sub firewall_is_in_subnet { |
879 | my $subnet = shift; | |
5cf8c8c1 | 880 | |
e9b5ba41 MT |
881 | # ORANGE is missing here, because nothing may ever access |
882 | # the firewall from this network. | |
4e54e3c6 | 883 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); |
e9b5ba41 | 884 | |
da7a2208 MT |
885 | if ($address) { |
886 | return 1; | |
e9b5ba41 | 887 | } |
da7a2208 MT |
888 | |
889 | return 0; | |
e9b5ba41 | 890 | } |