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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 | ); |
2801213d SS |
73 | my %ipset_loaded_sets = (); |
74 | my @ipset_used_sets = (); | |
f5ad4246 | 75 | |
6d8eb5de AM |
76 | my $configfwdfw = "${General::swroot}/firewall/config"; |
77 | my $configinput = "${General::swroot}/firewall/input"; | |
78 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
5730a5bc | 79 | my $locationfile = "${General::swroot}/firewall/locationblock"; |
2a81ab0d | 80 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 81 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 82 | |
6d8eb5de | 83 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 84 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 85 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
86 | &General::readhasharray($configfwdfw, \%configfwdfw); |
87 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 88 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 89 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 90 | |
5730a5bc SS |
91 | # Check if the location settings file exists |
92 | if (-e "$locationfile") { | |
f5ad4246 | 93 | # Read settings file |
5730a5bc | 94 | &General::readhash("$locationfile", \%locationsettings); |
f5ad4246 SS |
95 | } |
96 | ||
5730a5bc SS |
97 | # Get all available locations. |
98 | my @locations = &Location::Functions::get_locations(); | |
f5ad4246 | 99 | |
3bb4bb3f MT |
100 | my @log_limit_options = &make_log_limit_options(); |
101 | ||
aa5f4b65 MT |
102 | my $POLICY_INPUT_ALLOWED = 0; |
103 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
104 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
105 | ||
106 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
107 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
108 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
109 | ||
0564b0c7 SS |
110 | #workaround to suppress a warning when a variable is used only once |
111 | my @dummy = ( $Location::Functions::ipset_db_directory ); | |
112 | undef (@dummy); | |
113 | ||
8531b94a MT |
114 | # MAIN |
115 | &main(); | |
116 | ||
117 | sub main { | |
2801213d SS |
118 | # Get currently used ipset sets. |
119 | &ipset_get_sets(); | |
120 | ||
8531b94a MT |
121 | # Flush all chains. |
122 | &flush(); | |
123 | ||
2d0c7a9f AM |
124 | # Prepare firewall rules. |
125 | if (! -z "${General::swroot}/firewall/input"){ | |
126 | &buildrules(\%configinputfw); | |
127 | } | |
128 | if (! -z "${General::swroot}/firewall/outgoing"){ | |
129 | &buildrules(\%configoutgoingfw); | |
130 | } | |
131 | if (! -z "${General::swroot}/firewall/config"){ | |
132 | &buildrules(\%configfwdfw); | |
133 | } | |
8531b94a | 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 | 140 | |
2801213d SS |
141 | # Cleanup not longer needed ipset sets. |
142 | &ipset_cleanup(); | |
143 | ||
2d0c7a9f AM |
144 | #Reload firewall.local if present |
145 | if ( -f '/etc/sysconfig/firewall.local'){ | |
146 | run("/etc/sysconfig/firewall.local reload"); | |
147 | } | |
2a81ab0d | 148 | } |
97ab0569 | 149 | |
68d1eb10 MT |
150 | sub run { |
151 | # Executes or prints the given shell command. | |
152 | my $command = shift; | |
153 | ||
154 | if ($DEBUG) { | |
155 | print "$command\n"; | |
156 | } else { | |
157 | system "$command"; | |
6e87f0aa MT |
158 | |
159 | if ($?) { | |
160 | print_error("ERROR: $command"); | |
161 | } | |
68d1eb10 MT |
162 | } |
163 | } | |
164 | ||
6178953b MT |
165 | sub print_error { |
166 | my $message = shift; | |
167 | ||
168 | print STDERR "$message\n"; | |
169 | } | |
170 | ||
8f4f4634 MT |
171 | sub print_rule { |
172 | my $hash = shift; | |
173 | ||
174 | print "\nRULE:"; | |
175 | ||
176 | my $i = 0; | |
177 | foreach (@$hash) { | |
178 | printf(" %2d: %s", $i++, $_); | |
179 | } | |
180 | print "\n"; | |
181 | } | |
182 | ||
791c2b45 MT |
183 | sub count_elements { |
184 | my $hash = shift; | |
185 | ||
186 | return scalar @$hash; | |
187 | } | |
188 | ||
97ab0569 | 189 | sub flush { |
d98aa95a MT |
190 | run("$IPTABLES -F $CHAIN_INPUT"); |
191 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
192 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
193 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
194 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 195 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
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, $source); |
07106467 SS |
404 | } elsif ($source =~ /-m set/) { |
405 | # Grab location code from hash. | |
406 | my $loc_src = $$hash{$key}[4]; | |
407 | ||
bae9b5dc SS |
408 | # Call function to load the networks list for this country. |
409 | &ipset_restore($loc_src); | |
07106467 | 410 | |
b9ca2fa6 AM |
411 | push(@source_options, $source); |
412 | } elsif($source) { | |
6e87f0aa | 413 | push(@source_options, ("-s", $source)); |
2a81ab0d | 414 | } |
14f7cb87 | 415 | |
6e87f0aa | 416 | # Prepare destination options. |
c2a1af75 | 417 | my @destination_options = (); |
07106467 SS |
418 | if ($destination =~ /-m set/) { |
419 | # Grab location code from hash. | |
420 | my $loc_dst = $$hash{$key}[6]; | |
421 | ||
bae9b5dc SS |
422 | # Call function to load the networks list for this country. |
423 | &ipset_restore($loc_dst); | |
07106467 | 424 | |
b9ca2fa6 AM |
425 | push(@destination_options, $destination); |
426 | } elsif ($destination) { | |
c2a1af75 MT |
427 | push(@destination_options, ("-d", $destination)); |
428 | } | |
14f7cb87 | 429 | |
249839b0 MT |
430 | # Add source and destination interface to the filter rules. |
431 | # These are supposed to help filtering forged packets that originate | |
432 | # from BLUE with an IP address from GREEN for instance. | |
433 | my @source_intf_options = (); | |
434 | if ($source_intf) { | |
435 | push(@source_intf_options, ("-i", $source_intf)); | |
436 | } | |
437 | ||
438 | my @destination_intf_options = (); | |
439 | if ($destination_intf) { | |
440 | push(@destination_intf_options, ("-o", $destination_intf)); | |
441 | } | |
442 | ||
8f4f4634 MT |
443 | # Add time constraint options. |
444 | push(@options, @time_options); | |
14f7cb87 | 445 | |
d2793ea8 AM |
446 | # Add ratelimiting option |
447 | push(@options, @ratelimit_options); | |
448 | ||
aa5f4b65 | 449 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 450 | if ($source) { |
da7a2208 | 451 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
452 | } |
453 | ||
aa5f4b65 MT |
454 | my $firewall_is_in_destination_subnet = 1; |
455 | if ($destination) { | |
456 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
457 | } | |
458 | ||
8f4f4634 MT |
459 | # Process NAT rules. |
460 | if ($NAT) { | |
4e54e3c6 | 461 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 462 | |
8f4f4634 MT |
463 | # Skip NAT rules if the NAT address is unknown |
464 | # (i.e. no internet connection has been established, yet). | |
465 | next unless ($nat_address); | |
b05ec50a | 466 | |
8f4f4634 MT |
467 | # Destination NAT |
468 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
469 | my @nat_options = (); |
470 | if ($protocol ne "all") { | |
471 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
472 | push(@nat_options, @nat_protocol_options); | |
473 | } | |
21b37391 SS |
474 | |
475 | # Add time options. | |
ff7cb6d6 MT |
476 | push(@nat_options, @time_options); |
477 | ||
21b37391 SS |
478 | # Determine if a REDIRECT rule should be created. |
479 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports); | |
480 | ||
ff7cb6d6 | 481 | # Make port-forwardings useable from the internal networks. |
21b37391 SS |
482 | if (!$use_redirect) { |
483 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
484 | unless ($nat_address ~~ @internal_addresses) { | |
485 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); | |
486 | } | |
ff7cb6d6 MT |
487 | } |
488 | ||
21b37391 | 489 | # Add source options. |
6e87f0aa | 490 | push(@nat_options, @source_options); |
21b37391 SS |
491 | |
492 | # Add NAT address. | |
493 | if (!$use_redirect) { | |
494 | push(@nat_options, ("-d", $nat_address)); | |
495 | } | |
6e87f0aa | 496 | |
c0ce9206 | 497 | my $dnat_port; |
8f4f4634 | 498 | if ($protocol_has_ports) { |
c0ce9206 MT |
499 | $dnat_port = &get_dnat_target_port($hash, $key); |
500 | } | |
501 | ||
502 | my @nat_action_options = (); | |
b05ec50a | 503 | |
c0ce9206 | 504 | # Use iptables REDIRECT |
c0ce9206 | 505 | if ($use_redirect) { |
21b37391 SS |
506 | push(@nat_action_options, ("-j", "REDIRECT")); |
507 | ||
508 | # Redirect to specified port if one has given. | |
509 | if ($dnat_port) { | |
510 | push(@nat_action_options, ("--to-ports", $dnat_port)); | |
511 | } | |
c0ce9206 MT |
512 | |
513 | # Use iptables DNAT | |
514 | } else { | |
f98bb538 MT |
515 | if ($destination_is_firewall && !$destination) { |
516 | $destination = &fwlib::get_external_address(); | |
517 | } | |
518 | next unless ($destination); | |
519 | ||
c0ce9206 MT |
520 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
521 | @destination_options = ("-d", $dnat_address); | |
522 | ||
523 | if ($protocol_has_ports) { | |
524 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
525 | ||
526 | if ($dnat_port) { | |
527 | $dnat_address .= ":$dnat_port"; | |
528 | } | |
86a921ee | 529 | } |
c0ce9206 MT |
530 | |
531 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 532 | } |
8f4f4634 MT |
533 | |
534 | if ($LOG) { | |
3bb4bb3f | 535 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 536 | } |
c0ce9206 | 537 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
538 | |
539 | # Source NAT | |
540 | } elsif ($NAT_MODE eq "SNAT") { | |
c4b7692a | 541 | my @snat_options = ( "-m", "policy", "--dir", "out", "--pol", "none" ); |
6e87f0aa MT |
542 | my @nat_options = @options; |
543 | ||
c4b7692a SS |
544 | # Get addresses for the configured firewall interfaces. |
545 | my @local_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
546 | ||
547 | # Check if the nat_address is one of the local addresses. | |
548 | foreach my $local_address (@local_addresses) { | |
549 | if ($nat_address eq $local_address) { | |
550 | # Clear SNAT options. | |
551 | @snat_options = (); | |
552 | ||
553 | # Finish loop. | |
554 | last; | |
555 | } | |
556 | } | |
557 | ||
249839b0 | 558 | push(@nat_options, @destination_intf_options); |
6e87f0aa MT |
559 | push(@nat_options, @source_options); |
560 | push(@nat_options, @destination_options); | |
561 | ||
8f4f4634 | 562 | if ($LOG) { |
c4b7692a | 563 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 564 | } |
c4b7692a | 565 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @snat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
566 | } |
567 | } | |
8f4f4634 | 568 | |
6e87f0aa MT |
569 | push(@options, @source_options); |
570 | push(@options, @destination_options); | |
571 | ||
8f4f4634 | 572 | # Insert firewall rule. |
c22369a9 | 573 | if ($LOG) { |
249839b0 | 574 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 | 575 | } |
249839b0 | 576 | run("$IPTABLES -A $chain @options @source_intf_options @destination_intf_options -j $target"); |
aa5f4b65 MT |
577 | |
578 | # Handle forwarding rules and add corresponding rules for firewall access. | |
579 | if ($chain eq $CHAIN_FORWARD) { | |
580 | # If the firewall is part of the destination subnet and access to the destination network | |
581 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
582 | # for the firewall, too. | |
583 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
c22369a9 | 584 | if ($LOG) { |
249839b0 | 585 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); |
aa5f4b65 | 586 | } |
249839b0 | 587 | run("$IPTABLES -A $CHAIN_INPUT @options @source_intf_options -j $target"); |
aa5f4b65 MT |
588 | } |
589 | ||
590 | # Likewise. | |
591 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
c22369a9 | 592 | if ($LOG) { |
249839b0 | 593 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); |
aa5f4b65 | 594 | } |
249839b0 | 595 | run("$IPTABLES -A $CHAIN_OUTPUT @options @destination_intf_options -j $target"); |
aa5f4b65 MT |
596 | } |
597 | } | |
2a81ab0d AM |
598 | } |
599 | } | |
600 | } | |
2a81ab0d AM |
601 | } |
602 | } | |
97ab0569 | 603 | |
b05ec50a MT |
604 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
605 | sub format_time { | |
606 | my $val = shift; | |
607 | ||
608 | # Convert the given time into minutes. | |
609 | my $minutes = &time_convert_to_minutes($val); | |
610 | ||
611 | # Move the timestamp into UTC. | |
612 | $minutes += &time_utc_offset(); | |
613 | ||
614 | # Make sure $minutes is between 00:00 and 23:59. | |
615 | if ($minutes < 0) { | |
616 | $minutes += 1440; | |
617 | } | |
618 | ||
619 | if ($minutes > 1440) { | |
620 | $minutes -= 1440; | |
621 | } | |
622 | ||
623 | # Format as hh:mm. | |
624 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 625 | } |
97ab0569 | 626 | |
b05ec50a MT |
627 | # Calculates the offsets in minutes from the local timezone to UTC. |
628 | sub time_utc_offset { | |
629 | my @localtime = localtime(time); | |
630 | my @gmtime = gmtime(time); | |
631 | ||
632 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 633 | } |
97ab0569 | 634 | |
b05ec50a MT |
635 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
636 | sub time_convert_to_minutes { | |
637 | my ($hrs, $min) = split(":", shift); | |
638 | ||
639 | return ($hrs * 60) + $min; | |
472136c9 | 640 | } |
97ab0569 | 641 | |
5730a5bc | 642 | sub locationblock { |
2801213d SS |
643 | # Flush LOCATIONBLOCK chain. |
644 | run("$IPTABLES -F LOCATIONBLOCK"); | |
211694e5 | 645 | |
5730a5bc SS |
646 | # If location blocking is not enabled, we are finished here. |
647 | if ($locationsettings{'LOCATIONBLOCK_ENABLED'} ne "on") { | |
211694e5 SS |
648 | # Exit submodule. Process remaining script. |
649 | return; | |
650 | } | |
651 | ||
2293e1de PM |
652 | # Only check the RED interface, which is ppp0 in case of RED_TYPE being |
653 | # set to "PPPOE", and red0 in case of RED_TYPE not being empty otherwise. | |
654 | if ($defaultNetworks{'RED_TYPE'} eq "PPPOE") { | |
655 | run("$IPTABLES -A LOCATIONBLOCK ! -i ppp0 -j RETURN"); | |
656 | } elsif ($defaultNetworks{'RED_DEV'} ne "") { | |
c69c8200 MT |
657 | run("$IPTABLES -A LOCATIONBLOCK ! -i $defaultNetworks{'RED_DEV'} -j RETURN"); |
658 | } | |
659 | ||
660 | # Do not check any private address space | |
661 | foreach my $network (@PRIVATE_NETWORKS) { | |
662 | run("$IPTABLES -A LOCATIONBLOCK -s $network -j RETURN"); | |
663 | } | |
664 | ||
5730a5bc SS |
665 | # Loop through all supported locations and |
666 | # create iptables rules, if blocking for this country | |
211694e5 SS |
667 | # is enabled. |
668 | foreach my $location (@locations) { | |
5730a5bc | 669 | if(exists $locationsettings{$location} && $locationsettings{$location} eq "on") { |
bae9b5dc SS |
670 | # Call function to load the networks list for this country. |
671 | &ipset_restore($location); | |
0df1d268 SS |
672 | |
673 | # Call iptables and create rule to use the loaded ipset list. | |
2801213d | 674 | run("$IPTABLES -A LOCATIONBLOCK -m set --match-set $location src -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 ($address) { |
886 | return 1; | |
e9b5ba41 | 887 | } |
da7a2208 MT |
888 | |
889 | return 0; | |
e9b5ba41 | 890 | } |
6babb404 | 891 | |
2801213d SS |
892 | sub ipset_get_sets () { |
893 | # Get all currently used ipset lists and store them in an array. | |
894 | my @output = `$IPSET -n list`; | |
895 | ||
896 | # Loop through the temporary array. | |
897 | foreach my $set (@output) { | |
898 | # Remove any newlines. | |
899 | chomp($set); | |
900 | ||
901 | # Add the set the array of used sets. | |
902 | push(@ipset_used_sets, $set); | |
903 | } | |
904 | ||
905 | # Display used sets in debug mode. | |
906 | if($DEBUG) { | |
907 | print "Used ipset sets:\n"; | |
908 | print "@ipset_used_sets\n\n"; | |
909 | } | |
910 | } | |
911 | ||
6babb404 | 912 | sub ipset_restore ($) { |
2801213d | 913 | my ($set) = @_; |
6babb404 | 914 | |
50e43059 | 915 | my $file_prefix = "ipset4"; |
2801213d | 916 | my $db_file = "$Location::Functions::ipset_db_directory/$set.$file_prefix"; |
bae9b5dc | 917 | |
2801213d SS |
918 | # Check if the set already has been loaded. |
919 | if($ipset_loaded_sets{$set}) { | |
bae9b5dc SS |
920 | # It already has been loaded - so there is nothing to do. |
921 | return; | |
922 | } | |
50e43059 SS |
923 | |
924 | # Check if the generated file exists. | |
925 | if (-f $db_file) { | |
2801213d | 926 | # Run ipset and restore the given set. |
50e43059 | 927 | run("$IPSET restore < $db_file"); |
bae9b5dc | 928 | |
2801213d SS |
929 | # Store the restored set to the hash to prevent from loading it again. |
930 | $ipset_loaded_sets{$set} = "1"; | |
931 | } | |
932 | } | |
933 | ||
934 | sub ipset_cleanup () { | |
935 | # Loop through the array of used sets. | |
936 | foreach my $set (@ipset_used_sets) { | |
937 | # Check if this set is still in use. | |
938 | # | |
939 | # In this case an entry in the loaded sets hash exists. | |
940 | unless($ipset_loaded_sets{$set}) { | |
941 | # Entry does not exist, so this set is not longer | |
942 | # used and can be destroyed. | |
943 | run("$IPSET destroy $set"); | |
944 | } | |
50e43059 | 945 | } |
6babb404 | 946 | } |