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6178953b | 1 | #!/usr/bin/perl -w |
2a81ab0d AM |
2 | ############################################################################### |
3 | # # | |
4 | # IPFire.org - A linux based firewall # | |
5bee9a9d | 5 | # Copyright (C) 2013 Alexander Marx <amarx@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; |
2a81ab0d | 23 | |
97ab0569 MT |
24 | require '/var/ipfire/general-functions.pl'; |
25 | require "${General::swroot}/lang.pl"; | |
26 | require "/usr/lib/firewall/firewall-lib.pl"; | |
2a81ab0d | 27 | |
68d1eb10 MT |
28 | # Set to one to enable debugging mode. |
29 | my $DEBUG = 0; | |
30 | ||
1f9e7b53 MT |
31 | my $IPTABLES = "iptables --wait"; |
32 | ||
6178953b | 33 | # iptables chains |
8f4f4634 MT |
34 | my $CHAIN_INPUT = "INPUTFW"; |
35 | my $CHAIN_FORWARD = "FORWARDFW"; | |
d98aa95a | 36 | my $CHAIN_OUTPUT = "OUTGOINGFW"; |
8f4f4634 | 37 | my $CHAIN = $CHAIN_FORWARD; |
6178953b MT |
38 | my $CHAIN_NAT_SOURCE = "NAT_SOURCE"; |
39 | my $CHAIN_NAT_DESTINATION = "NAT_DESTINATION"; | |
6e87f0aa | 40 | my $CHAIN_MANGLE_NAT_DESTINATION_FIX = "NAT_DESTINATION"; |
8f4f4634 | 41 | my @VALID_CHAINS = ($CHAIN_INPUT, $CHAIN_FORWARD, $CHAIN_OUTPUT); |
c2a1af75 | 42 | my @ANY_ADDRESSES = ("0.0.0.0/0.0.0.0", "0.0.0.0/0", "0/0"); |
8f4f4634 MT |
43 | |
44 | my @PROTOCOLS = ("tcp", "udp", "icmp", "igmp", "ah", "esp", "gre", "ipv6", "ipip"); | |
45 | my @PROTOCOLS_WITH_PORTS = ("tcp", "udp"); | |
46 | ||
47 | my @VALID_TARGETS = ("ACCEPT", "DROP", "REJECT"); | |
6178953b | 48 | |
2a81ab0d | 49 | my %fwdfwsettings=(); |
aa5f4b65 | 50 | my %fwoptions = (); |
2a81ab0d | 51 | my %defaultNetworks=(); |
8f4f4634 | 52 | my %configfwdfw=();; |
2a81ab0d | 53 | my %customgrp=(); |
2a81ab0d | 54 | my %configinputfw=(); |
5d7faa45 | 55 | my %configoutgoingfw=(); |
a6edca5a | 56 | my %confignatfw=(); |
36196d0d | 57 | my @p2ps=(); |
2a81ab0d | 58 | |
6d8eb5de AM |
59 | my $configfwdfw = "${General::swroot}/firewall/config"; |
60 | my $configinput = "${General::swroot}/firewall/input"; | |
61 | my $configoutgoing = "${General::swroot}/firewall/outgoing"; | |
62 | my $p2pfile = "${General::swroot}/firewall/p2protocols"; | |
211694e5 | 63 | my $geoipfile = "${General::swroot}/firewall/geoipblock"; |
2a81ab0d | 64 | my $configgrp = "${General::swroot}/fwhosts/customgroups"; |
210ee67b | 65 | my $netsettings = "${General::swroot}/ethernet/settings"; |
86a921ee | 66 | |
6d8eb5de | 67 | &General::readhash("${General::swroot}/firewall/settings", \%fwdfwsettings); |
aa5f4b65 | 68 | &General::readhash("${General::swroot}/optionsfw/settings", \%fwoptions); |
210ee67b | 69 | &General::readhash("$netsettings", \%defaultNetworks); |
2a81ab0d AM |
70 | &General::readhasharray($configfwdfw, \%configfwdfw); |
71 | &General::readhasharray($configinput, \%configinputfw); | |
5d7faa45 | 72 | &General::readhasharray($configoutgoing, \%configoutgoingfw); |
2a81ab0d | 73 | &General::readhasharray($configgrp, \%customgrp); |
2a81ab0d | 74 | |
3bb4bb3f MT |
75 | my @log_limit_options = &make_log_limit_options(); |
76 | ||
aa5f4b65 MT |
77 | my $POLICY_INPUT_ALLOWED = 0; |
78 | my $POLICY_FORWARD_ALLOWED = ($fwdfwsettings{"POLICY"} eq "MODE2"); | |
79 | my $POLICY_OUTPUT_ALLOWED = ($fwdfwsettings{"POLICY1"} eq "MODE2"); | |
80 | ||
81 | my $POLICY_INPUT_ACTION = $fwoptions{"FWPOLICY2"}; | |
82 | my $POLICY_FORWARD_ACTION = $fwoptions{"FWPOLICY"}; | |
83 | my $POLICY_OUTPUT_ACTION = $fwoptions{"FWPOLICY1"}; | |
84 | ||
8531b94a MT |
85 | # MAIN |
86 | &main(); | |
87 | ||
88 | sub main { | |
89 | # Flush all chains. | |
90 | &flush(); | |
91 | ||
92 | # Reload firewall rules. | |
93 | &preparerules(); | |
94 | ||
95 | # Load P2P block rules. | |
96 | &p2pblock(); | |
97 | ||
211694e5 SS |
98 | # Load GeoIP block rules. |
99 | &geoipblock(); | |
100 | ||
8531b94a MT |
101 | # Reload firewall policy. |
102 | run("/usr/sbin/firewall-policy"); | |
2a81ab0d | 103 | } |
97ab0569 | 104 | |
68d1eb10 MT |
105 | sub run { |
106 | # Executes or prints the given shell command. | |
107 | my $command = shift; | |
108 | ||
109 | if ($DEBUG) { | |
110 | print "$command\n"; | |
111 | } else { | |
112 | system "$command"; | |
6e87f0aa MT |
113 | |
114 | if ($?) { | |
115 | print_error("ERROR: $command"); | |
116 | } | |
68d1eb10 MT |
117 | } |
118 | } | |
119 | ||
6178953b MT |
120 | sub print_error { |
121 | my $message = shift; | |
122 | ||
123 | print STDERR "$message\n"; | |
124 | } | |
125 | ||
8f4f4634 MT |
126 | sub print_rule { |
127 | my $hash = shift; | |
128 | ||
129 | print "\nRULE:"; | |
130 | ||
131 | my $i = 0; | |
132 | foreach (@$hash) { | |
133 | printf(" %2d: %s", $i++, $_); | |
134 | } | |
135 | print "\n"; | |
136 | } | |
137 | ||
791c2b45 MT |
138 | sub count_elements { |
139 | my $hash = shift; | |
140 | ||
141 | return scalar @$hash; | |
142 | } | |
143 | ||
97ab0569 | 144 | sub flush { |
d98aa95a MT |
145 | run("$IPTABLES -F $CHAIN_INPUT"); |
146 | run("$IPTABLES -F $CHAIN_FORWARD"); | |
147 | run("$IPTABLES -F $CHAIN_OUTPUT"); | |
148 | run("$IPTABLES -t nat -F $CHAIN_NAT_SOURCE"); | |
149 | run("$IPTABLES -t nat -F $CHAIN_NAT_DESTINATION"); | |
6e87f0aa | 150 | run("$IPTABLES -t mangle -F $CHAIN_MANGLE_NAT_DESTINATION_FIX"); |
86a921ee | 151 | } |
97ab0569 MT |
152 | |
153 | sub preparerules { | |
6d8eb5de | 154 | if (! -z "${General::swroot}/firewall/input"){ |
2a81ab0d AM |
155 | &buildrules(\%configinputfw); |
156 | } | |
6d8eb5de | 157 | if (! -z "${General::swroot}/firewall/outgoing"){ |
5d7faa45 AM |
158 | &buildrules(\%configoutgoingfw); |
159 | } | |
aa5f4b65 MT |
160 | if (! -z "${General::swroot}/firewall/config"){ |
161 | &buildrules(\%configfwdfw); | |
162 | } | |
2a81ab0d | 163 | } |
97ab0569 MT |
164 | |
165 | sub buildrules { | |
8f4f4634 MT |
166 | my $hash = shift; |
167 | ||
aa5f4b65 MT |
168 | # Search for targets that need to be specially handled when adding |
169 | # forwarding rules. Additional rules will automatically get inserted | |
170 | # into the INPUT/OUTPUT chains for these targets. | |
171 | my @special_input_targets = (); | |
172 | if (!$POLICY_FORWARD_ALLOWED) { | |
173 | push(@special_input_targets, "ACCEPT"); | |
174 | } | |
175 | ||
176 | if ($POLICY_INPUT_ACTION eq "DROP") { | |
177 | push(@special_input_targets, "REJECT"); | |
178 | } elsif ($POLICY_INPUT_ACTION eq "REJECT") { | |
179 | push(@special_input_targets, "DROP"); | |
180 | } | |
181 | ||
182 | my @special_output_targets = (); | |
183 | if ($POLICY_OUTPUT_ALLOWED) { | |
184 | push(@special_output_targets, ("DROP", "REJECT")); | |
185 | } else { | |
186 | push(@special_output_targets, "ACCEPT"); | |
187 | ||
188 | if ($POLICY_OUTPUT_ACTION eq "DROP") { | |
189 | push(@special_output_targets, "REJECT"); | |
190 | } elsif ($POLICY_OUTPUT_ACTION eq "REJECT") { | |
191 | push(@special_output_targets, "DROP"); | |
192 | } | |
193 | } | |
194 | ||
8f4f4634 MT |
195 | foreach my $key (sort {$a <=> $b} keys %$hash) { |
196 | # Skip disabled rules. | |
197 | next unless ($$hash{$key}[2] eq 'ON'); | |
198 | ||
791c2b45 MT |
199 | # Count number of elements in this line |
200 | my $elements = &count_elements($$hash{$key}); | |
201 | ||
8f4f4634 MT |
202 | if ($DEBUG) { |
203 | print_rule($$hash{$key}); | |
204 | } | |
205 | ||
206 | # Check if the target is valid. | |
207 | my $target = $$hash{$key}[0]; | |
208 | if (!$target ~~ @VALID_TARGETS) { | |
209 | print_error("Invalid target '$target' for rule $key"); | |
210 | next; | |
211 | } | |
212 | ||
213 | # Check if the chain is valid. | |
214 | my $chain = $$hash{$key}[1]; | |
215 | if (!$chain ~~ @VALID_CHAINS) { | |
216 | print_error("Invalid chain '$chain' in rule $key"); | |
217 | next; | |
218 | } | |
219 | ||
220 | # Collect all sources. | |
4e54e3c6 | 221 | my @sources = &fwlib::get_addresses($hash, $key, "src"); |
8f4f4634 MT |
222 | |
223 | # Collect all destinations. | |
4e54e3c6 | 224 | my @destinations = &fwlib::get_addresses($hash, $key, "tgt"); |
6178953b | 225 | |
c0ce9206 MT |
226 | # True if the destination is the firewall itself. |
227 | my $destination_is_firewall = ($$hash{$key}[5] eq "ipfire"); | |
228 | ||
6178953b | 229 | # Check if logging should be enabled. |
8f4f4634 | 230 | my $LOG = ($$hash{$key}[17] eq 'ON'); |
6178953b | 231 | |
8f4f4634 MT |
232 | # Check if NAT is enabled and initialize variables, that we use for that. |
233 | my $NAT = ($$hash{$key}[28] eq 'ON'); | |
6178953b | 234 | my $NAT_MODE; |
8f4f4634 MT |
235 | if ($NAT) { |
236 | $NAT_MODE = uc($$hash{$key}[31]); | |
237 | } | |
6178953b | 238 | |
8f4f4634 MT |
239 | # Set up time constraints. |
240 | my @time_options = (); | |
241 | if ($$hash{$key}[18] eq 'ON') { | |
242 | push(@time_options, ("-m", "time")); | |
6178953b | 243 | |
8f4f4634 MT |
244 | # Select all days of the week this match is active. |
245 | my @weekdays = (); | |
246 | if ($$hash{$key}[19] ne '') { | |
247 | push (@weekdays, "Mon"); | |
248 | } | |
249 | if ($$hash{$key}[20] ne '') { | |
250 | push (@weekdays, "Tue"); | |
251 | } | |
252 | if ($$hash{$key}[21] ne '') { | |
253 | push (@weekdays, "Wed"); | |
254 | } | |
255 | if ($$hash{$key}[22] ne '') { | |
256 | push (@weekdays, "Thu"); | |
257 | } | |
258 | if ($$hash{$key}[23] ne '') { | |
259 | push (@weekdays, "Fri"); | |
260 | } | |
261 | if ($$hash{$key}[24] ne '') { | |
262 | push (@weekdays, "Sat"); | |
263 | } | |
264 | if ($$hash{$key}[25] ne '') { | |
265 | push (@weekdays, "Sun"); | |
266 | } | |
267 | if (@weekdays) { | |
268 | push(@time_options, ("--weekdays", join(",", @weekdays))); | |
269 | } | |
6178953b | 270 | |
8f4f4634 MT |
271 | # Convert start time. |
272 | my $time_start = &format_time($$hash{$key}[26]); | |
273 | if ($time_start) { | |
274 | push(@time_options, ("--timestart", $time_start)); | |
a6edca5a | 275 | } |
6178953b | 276 | |
8f4f4634 MT |
277 | # Convert end time. |
278 | my $time_stop = &format_time($$hash{$key}[27]); | |
279 | if ($time_stop) { | |
280 | push(@time_options, ("--timestop", $time_stop)); | |
281 | } | |
a6edca5a | 282 | } |
6178953b | 283 | |
d2793ea8 AM |
284 | # Concurrent connection limit |
285 | my @ratelimit_options = (); | |
791c2b45 | 286 | |
d840d02a | 287 | if (($elements ge 34) && ($$hash{$key}[32] eq 'ON')) { |
d2793ea8 AM |
288 | my $conn_limit = $$hash{$key}[33]; |
289 | ||
290 | if ($conn_limit ge 1) { | |
291 | push(@ratelimit_options, ("-m", "connlimit")); | |
292 | ||
293 | # Use the the entire source IP address | |
294 | push(@ratelimit_options, "--connlimit-saddr"); | |
295 | push(@ratelimit_options, ("--connlimit-mask", "32")); | |
296 | ||
297 | # Apply the limit | |
298 | push(@ratelimit_options, ("--connlimit-upto", $conn_limit)); | |
299 | } | |
300 | } | |
301 | ||
302 | # Ratelimit | |
d840d02a | 303 | if (($elements ge 37) && ($$hash{$key}[34] eq 'ON')) { |
d2793ea8 AM |
304 | my $rate_limit = "$$hash{$key}[35]/$$hash{$key}[36]"; |
305 | ||
d840d02a MT |
306 | if ($rate_limit) { |
307 | push(@ratelimit_options, ("-m", "limit")); | |
308 | push(@ratelimit_options, ("--limit", $rate_limit)); | |
309 | } | |
d2793ea8 AM |
310 | } |
311 | ||
8f4f4634 MT |
312 | # Check which protocols are used in this rule and so that we can |
313 | # later group rules by protocols. | |
314 | my @protocols = &get_protocols($hash, $key); | |
315 | if (!@protocols) { | |
316 | print_error("Invalid protocol configuration for rule $key"); | |
317 | next; | |
318 | } | |
319 | ||
320 | foreach my $protocol (@protocols) { | |
321 | # Check if the given protocol is supported. | |
322 | if (($protocol ne "all") && (!$protocol ~~ @PROTOCOLS)) { | |
323 | print_error("Protocol $protocol is not supported (rule $key)"); | |
324 | next; | |
2a81ab0d | 325 | } |
8f4f4634 MT |
326 | |
327 | # Prepare protocol options (like ICMP types, ports, etc...). | |
d7a14d01 | 328 | my @protocol_options = &get_protocol_options($hash, $key, $protocol, 0); |
8f4f4634 MT |
329 | |
330 | # Check if this protocol knows ports. | |
331 | my $protocol_has_ports = ($protocol ~~ @PROTOCOLS_WITH_PORTS); | |
332 | ||
02574191 MT |
333 | foreach my $src (@sources) { |
334 | # Skip invalid source. | |
4e9a2b57 | 335 | next unless (defined $src); |
02574191 | 336 | next unless ($src); |
8f4f4634 | 337 | |
02574191 | 338 | # Sanitize source. |
48f07c19 | 339 | my $source = @$src[0]; |
02574191 MT |
340 | if ($source ~~ @ANY_ADDRESSES) { |
341 | $source = ""; | |
342 | } | |
343 | ||
48f07c19 AM |
344 | my $source_intf = @$src[1]; |
345 | ||
02574191 MT |
346 | foreach my $dst (@destinations) { |
347 | # Skip invalid rules. | |
4e9a2b57 | 348 | next unless (defined $dst); |
02574191 | 349 | next if (!$dst || ($dst eq "none")); |
c2a1af75 MT |
350 | |
351 | # Sanitize destination. | |
48f07c19 | 352 | my $destination = @$dst[0]; |
c2a1af75 MT |
353 | if ($destination ~~ @ANY_ADDRESSES) { |
354 | $destination = ""; | |
355 | } | |
356 | ||
48f07c19 AM |
357 | my $destination_intf = @$dst[1]; |
358 | ||
8f4f4634 MT |
359 | # Array with iptables arguments. |
360 | my @options = (); | |
361 | ||
362 | # Append protocol. | |
363 | if ($protocol ne "all") { | |
8f4f4634 | 364 | push(@options, @protocol_options); |
2a81ab0d | 365 | } |
8f4f4634 | 366 | |
6e87f0aa MT |
367 | # Prepare source options. |
368 | my @source_options = (); | |
8f4f4634 | 369 | if ($source =~ /mac/) { |
6e87f0aa | 370 | push(@source_options, $source); |
c2a1af75 | 371 | } elsif ($source) { |
6e87f0aa | 372 | push(@source_options, ("-s", $source)); |
2a81ab0d | 373 | } |
14f7cb87 | 374 | |
6e87f0aa | 375 | # Prepare destination options. |
c2a1af75 MT |
376 | my @destination_options = (); |
377 | if ($destination) { | |
378 | push(@destination_options, ("-d", $destination)); | |
379 | } | |
14f7cb87 | 380 | |
8f4f4634 MT |
381 | # Add time constraint options. |
382 | push(@options, @time_options); | |
14f7cb87 | 383 | |
d2793ea8 AM |
384 | # Add ratelimiting option |
385 | push(@options, @ratelimit_options); | |
386 | ||
aa5f4b65 | 387 | my $firewall_is_in_source_subnet = 1; |
e9b5ba41 | 388 | if ($source) { |
da7a2208 | 389 | $firewall_is_in_source_subnet = &firewall_is_in_subnet($source); |
e9b5ba41 MT |
390 | } |
391 | ||
aa5f4b65 MT |
392 | my $firewall_is_in_destination_subnet = 1; |
393 | if ($destination) { | |
394 | $firewall_is_in_destination_subnet = &firewall_is_in_subnet($destination); | |
395 | } | |
396 | ||
8f4f4634 MT |
397 | # Process NAT rules. |
398 | if ($NAT) { | |
4e54e3c6 | 399 | my $nat_address = &fwlib::get_nat_address($$hash{$key}[29], $source); |
b05ec50a | 400 | |
8f4f4634 MT |
401 | # Skip NAT rules if the NAT address is unknown |
402 | # (i.e. no internet connection has been established, yet). | |
403 | next unless ($nat_address); | |
b05ec50a | 404 | |
8f4f4634 MT |
405 | # Destination NAT |
406 | if ($NAT_MODE eq "DNAT") { | |
d7a14d01 MT |
407 | my @nat_options = (); |
408 | if ($protocol ne "all") { | |
409 | my @nat_protocol_options = &get_protocol_options($hash, $key, $protocol, 1); | |
410 | push(@nat_options, @nat_protocol_options); | |
411 | } | |
ff7cb6d6 MT |
412 | push(@nat_options, @time_options); |
413 | ||
414 | # Make port-forwardings useable from the internal networks. | |
415 | my @internal_addresses = &fwlib::get_internal_firewall_ip_addresses(1); | |
416 | unless ($nat_address ~~ @internal_addresses) { | |
48f07c19 | 417 | &add_dnat_mangle_rules($nat_address, $source_intf, @nat_options); |
ff7cb6d6 MT |
418 | } |
419 | ||
6e87f0aa | 420 | push(@nat_options, @source_options); |
8f4f4634 | 421 | push(@nat_options, ("-d", $nat_address)); |
6e87f0aa | 422 | |
c0ce9206 | 423 | my $dnat_port; |
8f4f4634 | 424 | if ($protocol_has_ports) { |
c0ce9206 MT |
425 | $dnat_port = &get_dnat_target_port($hash, $key); |
426 | } | |
427 | ||
428 | my @nat_action_options = (); | |
b05ec50a | 429 | |
c0ce9206 MT |
430 | # Use iptables REDIRECT |
431 | my $use_redirect = ($destination_is_firewall && !$destination && $protocol_has_ports && $dnat_port); | |
432 | if ($use_redirect) { | |
433 | push(@nat_action_options, ("-j", "REDIRECT", "--to-ports", $dnat_port)); | |
434 | ||
435 | # Use iptables DNAT | |
436 | } else { | |
f98bb538 MT |
437 | if ($destination_is_firewall && !$destination) { |
438 | $destination = &fwlib::get_external_address(); | |
439 | } | |
440 | next unless ($destination); | |
441 | ||
c0ce9206 MT |
442 | my ($dnat_address, $dnat_mask) = split("/", $destination); |
443 | @destination_options = ("-d", $dnat_address); | |
444 | ||
445 | if ($protocol_has_ports) { | |
446 | my $dnat_port = &get_dnat_target_port($hash, $key); | |
447 | ||
448 | if ($dnat_port) { | |
449 | $dnat_address .= ":$dnat_port"; | |
450 | } | |
86a921ee | 451 | } |
c0ce9206 MT |
452 | |
453 | push(@nat_action_options, ("-j", "DNAT", "--to-destination", $dnat_address)); | |
2a81ab0d | 454 | } |
8f4f4634 MT |
455 | |
456 | if ($LOG) { | |
3bb4bb3f | 457 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @log_limit_options -j LOG --log-prefix 'DNAT '"); |
8f4f4634 | 458 | } |
c0ce9206 | 459 | run("$IPTABLES -t nat -A $CHAIN_NAT_DESTINATION @nat_options @nat_action_options"); |
8f4f4634 MT |
460 | |
461 | # Source NAT | |
462 | } elsif ($NAT_MODE eq "SNAT") { | |
6e87f0aa MT |
463 | my @nat_options = @options; |
464 | ||
465 | push(@nat_options, @source_options); | |
466 | push(@nat_options, @destination_options); | |
467 | ||
8f4f4634 | 468 | if ($LOG) { |
3bb4bb3f | 469 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options @log_limit_options -j LOG --log-prefix 'SNAT '"); |
8f4f4634 | 470 | } |
6e87f0aa | 471 | run("$IPTABLES -t nat -A $CHAIN_NAT_SOURCE @nat_options -j SNAT --to-source $nat_address"); |
2a81ab0d AM |
472 | } |
473 | } | |
8f4f4634 | 474 | |
1b34f6cd MT |
475 | # Add source and destination interface to the filter rules. |
476 | # These are supposed to help filtering forged packets that originate | |
477 | # from BLUE with an IP address from GREEN for instance. | |
478 | if ($source_intf) { | |
479 | push(@source_options, ("-i", $source_intf)); | |
480 | } | |
481 | ||
482 | if ($destination_intf) { | |
483 | push(@destination_options, ("-o", $destination_intf)); | |
484 | } | |
485 | ||
6e87f0aa MT |
486 | push(@options, @source_options); |
487 | push(@options, @destination_options); | |
488 | ||
8f4f4634 MT |
489 | # Insert firewall rule. |
490 | if ($LOG && !$NAT) { | |
0bda23f5 | 491 | run("$IPTABLES -A $chain @options @log_limit_options -j LOG --log-prefix '$chain '"); |
8f4f4634 MT |
492 | } |
493 | run("$IPTABLES -A $chain @options -j $target"); | |
aa5f4b65 MT |
494 | |
495 | # Handle forwarding rules and add corresponding rules for firewall access. | |
496 | if ($chain eq $CHAIN_FORWARD) { | |
497 | # If the firewall is part of the destination subnet and access to the destination network | |
498 | # is granted/forbidden for any network that the firewall itself is part of, we grant/forbid access | |
499 | # for the firewall, too. | |
500 | if ($firewall_is_in_destination_subnet && ($target ~~ @special_input_targets)) { | |
501 | if ($LOG && !$NAT) { | |
502 | run("$IPTABLES -A $CHAIN_INPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_INPUT '"); | |
503 | } | |
504 | run("$IPTABLES -A $CHAIN_INPUT @options -j $target"); | |
505 | } | |
506 | ||
507 | # Likewise. | |
508 | if ($firewall_is_in_source_subnet && ($target ~~ @special_output_targets)) { | |
509 | if ($LOG && !$NAT) { | |
510 | run("$IPTABLES -A $CHAIN_OUTPUT @options @log_limit_options -j LOG --log-prefix '$CHAIN_OUTPUT '"); | |
511 | } | |
512 | run("$IPTABLES -A $CHAIN_OUTPUT @options -j $target"); | |
513 | } | |
514 | } | |
2a81ab0d AM |
515 | } |
516 | } | |
517 | } | |
2a81ab0d | 518 | } |
ca4259a7 AM |
519 | #Reload firewall.local if present |
520 | if ( -f '/etc/sysconfig/firewall.local'){ | |
521 | run("/etc/sysconfig/firewall.local reload"); | |
522 | } | |
2a81ab0d | 523 | } |
97ab0569 | 524 | |
b05ec50a MT |
525 | # Formats the given timestamp into the iptables format which is "hh:mm" UTC. |
526 | sub format_time { | |
527 | my $val = shift; | |
528 | ||
529 | # Convert the given time into minutes. | |
530 | my $minutes = &time_convert_to_minutes($val); | |
531 | ||
532 | # Move the timestamp into UTC. | |
533 | $minutes += &time_utc_offset(); | |
534 | ||
535 | # Make sure $minutes is between 00:00 and 23:59. | |
536 | if ($minutes < 0) { | |
537 | $minutes += 1440; | |
538 | } | |
539 | ||
540 | if ($minutes > 1440) { | |
541 | $minutes -= 1440; | |
542 | } | |
543 | ||
544 | # Format as hh:mm. | |
545 | return sprintf("%02d:%02d", $minutes / 60, $minutes % 60); | |
472136c9 | 546 | } |
97ab0569 | 547 | |
b05ec50a MT |
548 | # Calculates the offsets in minutes from the local timezone to UTC. |
549 | sub time_utc_offset { | |
550 | my @localtime = localtime(time); | |
551 | my @gmtime = gmtime(time); | |
552 | ||
553 | return ($gmtime[2] * 60 + $gmtime[1] % 60) - ($localtime[2] * 60 + $localtime[1] % 60); | |
472136c9 | 554 | } |
97ab0569 | 555 | |
b05ec50a MT |
556 | # Takes a timestamp like "14:00" and converts it into minutes since midnight. |
557 | sub time_convert_to_minutes { | |
558 | my ($hrs, $min) = split(":", shift); | |
559 | ||
560 | return ($hrs * 60) + $min; | |
472136c9 | 561 | } |
97ab0569 MT |
562 | |
563 | sub p2pblock { | |
766c2f60 MT |
564 | open(FILE, "<$p2pfile") or die "Unable to read $p2pfile"; |
565 | my @protocols = (); | |
566 | foreach my $p2pentry (<FILE>) { | |
567 | my @p2pline = split(/\;/, $p2pentry); | |
2a5b19c5 | 568 | next unless ($p2pline[2] eq "off"); |
766c2f60 MT |
569 | |
570 | push(@protocols, "--$p2pline[1]"); | |
36196d0d | 571 | } |
766c2f60 | 572 | close(FILE); |
68d1eb10 | 573 | |
24d36c80 | 574 | run("$IPTABLES -F P2PBLOCK"); |
766c2f60 | 575 | if (@protocols) { |
2a5b19c5 | 576 | run("$IPTABLES -A P2PBLOCK -m ipp2p @protocols -j DROP"); |
36196d0d AM |
577 | } |
578 | } | |
97ab0569 | 579 | |
211694e5 SS |
580 | sub geoipblock { |
581 | my %geoipsettings = (); | |
582 | ||
583 | # Check if the geoip settings file exists | |
584 | if (-e "$geoipfile") { | |
585 | # Read settings file | |
586 | &General::readhash("$geoipfile", \%geoipsettings); | |
587 | } else { | |
588 | # Exit submodule, go on processing the remaining script | |
589 | return; | |
590 | } | |
591 | ||
592 | # If geoip blocking is not enabled, we are finished here. | |
593 | if ($geoipsettings{'GEOIPBLOCK_ENABLED'} ne "on") { | |
594 | # Exit submodule. Process remaining script. | |
595 | return; | |
596 | } | |
597 | ||
598 | # Get supported locations. | |
599 | my @locations = &fwlib::get_geoip_locations(); | |
600 | ||
601 | # Create iptables chain. | |
602 | run("$IPTABLES -F GEOIPBLOCK"); | |
603 | ||
604 | # Loop through all supported geoip locations and | |
605 | # create iptables rules, if blocking this country | |
606 | # is enabled. | |
607 | foreach my $location (@locations) { | |
608 | if($geoipsettings{$location} eq "on") { | |
609 | run("$IPTABLES -A GEOIPBLOCK -m geoip --src-cc $location -j DROP"); | |
610 | } | |
611 | } | |
612 | } | |
613 | ||
8f4f4634 MT |
614 | sub get_protocols { |
615 | my $hash = shift; | |
616 | my $key = shift; | |
617 | ||
618 | my $uses_source_ports = ($$hash{$key}[7] eq "ON"); | |
619 | my $uses_services = ($$hash{$key}[11] eq "ON"); | |
620 | ||
621 | my @protocols = (); | |
622 | ||
623 | # Rules which don't have source ports or services (like ICMP, ESP, ...). | |
624 | if (!$uses_source_ports && !$uses_services) { | |
625 | push(@protocols, $$hash{$key}[8]); | |
626 | ||
627 | # Rules which either use ports or services. | |
628 | } elsif ($uses_source_ports || $uses_services) { | |
629 | # Check if service group or service | |
630 | if ($$hash{$key}[14] eq 'cust_srv') { | |
631 | push(@protocols, &fwlib::get_srv_prot($$hash{$key}[15])); | |
632 | ||
633 | } elsif($$hash{$key}[14] eq 'cust_srvgrp'){ | |
634 | my $protos = &fwlib::get_srvgrp_prot($$hash{$key}[15]); | |
635 | push(@protocols, split(",", $protos)); | |
636 | ||
637 | } else { | |
638 | # Fetch the protocol for this rule. | |
639 | my $protocol = lc($$hash{$key}[8]); | |
640 | ||
641 | # Fetch source and destination ports for this rule. | |
642 | my $source_ports = $$hash{$key}[10]; | |
643 | my $destination_ports = $$hash{$key}[15]; | |
644 | ||
645 | # Check if ports are set for protocols which do not support ports. | |
646 | if (!($protocol ~~ @PROTOCOLS_WITH_PORTS) && ($source_ports || $destination_ports)) { | |
647 | print_error("$protocol does not support ports"); | |
648 | return (); | |
649 | } | |
650 | ||
651 | push(@protocols, $protocol); | |
2a81ab0d AM |
652 | } |
653 | } | |
8f4f4634 MT |
654 | |
655 | # Remove all empty elements | |
656 | @protocols = map { $_ ? $_ : () } @protocols; | |
657 | ||
658 | # If no protocol has been defined, we assume "all". | |
659 | if (!@protocols) { | |
660 | push(@protocols, "all"); | |
98cee89f | 661 | } |
8f4f4634 MT |
662 | |
663 | # Make all protocol names lowercase. | |
664 | @protocols = map { lc } @protocols; | |
665 | ||
666 | return @protocols; | |
2a81ab0d | 667 | } |
97ab0569 | 668 | |
8f4f4634 MT |
669 | sub get_protocol_options { |
670 | my $hash = shift; | |
671 | my $key = shift; | |
672 | my $protocol = shift; | |
d7a14d01 | 673 | my $nat_options_wanted = shift; |
8f4f4634 MT |
674 | my @options = (); |
675 | ||
d7a14d01 MT |
676 | # Nothing to do if no protocol is specified. |
677 | if ($protocol eq "all") { | |
678 | return @options; | |
679 | } else { | |
680 | push(@options, ("-p", $protocol)); | |
681 | } | |
682 | ||
fcc68a42 MT |
683 | if ($protocol ~~ @PROTOCOLS_WITH_PORTS) { |
684 | # Process source ports. | |
685 | my $use_src_ports = ($$hash{$key}[7] eq "ON"); | |
686 | my $src_ports = $$hash{$key}[10]; | |
8f4f4634 | 687 | |
fcc68a42 MT |
688 | if ($use_src_ports && $src_ports) { |
689 | push(@options, &format_ports($src_ports, "src")); | |
690 | } | |
8f4f4634 | 691 | |
fcc68a42 MT |
692 | # Process destination ports. |
693 | my $use_dst_ports = ($$hash{$key}[11] eq "ON"); | |
694 | my $use_dnat = (($$hash{$key}[28] eq "ON") && ($$hash{$key}[31] eq "dnat")); | |
8f4f4634 | 695 | |
fcc68a42 MT |
696 | if ($use_dst_ports) { |
697 | my $dst_ports_mode = $$hash{$key}[14]; | |
698 | my $dst_ports = $$hash{$key}[15]; | |
8f4f4634 | 699 | |
fcc68a42 MT |
700 | if (($dst_ports_mode eq "TGT_PORT") && $dst_ports) { |
701 | if ($nat_options_wanted && $use_dnat && $$hash{$key}[30]) { | |
702 | $dst_ports = $$hash{$key}[30]; | |
703 | } | |
8f4f4634 | 704 | push(@options, &format_ports($dst_ports, "dst")); |
8f4f4634 | 705 | |
fcc68a42 MT |
706 | } elsif ($dst_ports_mode eq "cust_srv") { |
707 | if ($protocol eq "ICMP") { | |
708 | push(@options, ("--icmp-type", &fwlib::get_srv_port($dst_ports, 3, "ICMP"))); | |
709 | } else { | |
710 | $dst_ports = &fwlib::get_srv_port($dst_ports, 1, uc($protocol)); | |
711 | push(@options, &format_ports($dst_ports, "dst")); | |
712 | } | |
713 | ||
714 | } elsif ($dst_ports_mode eq "cust_srvgrp") { | |
715 | push(@options, &fwlib::get_srvgrp_port($dst_ports, uc($protocol))); | |
716 | } | |
2a81ab0d AM |
717 | } |
718 | } | |
8f4f4634 MT |
719 | |
720 | # Check if a single ICMP type is selected. | |
fcc68a42 | 721 | if ($protocol eq "icmp") { |
8f4f4634 MT |
722 | my $icmp_type = $$hash{$key}[9]; |
723 | ||
724 | if (($icmp_type ne "All ICMP-Types") && $icmp_type) { | |
725 | push(@options, ("--icmp-type", $icmp_type)); | |
a4c7bf6b AM |
726 | } |
727 | } | |
8f4f4634 MT |
728 | |
729 | return @options; | |
730 | } | |
731 | ||
732 | sub format_ports { | |
733 | my $ports = shift; | |
734 | my $type = shift; | |
735 | ||
736 | my $arg; | |
737 | if ($type eq "src") { | |
738 | $arg = "--sport"; | |
739 | } elsif ($type eq "dst") { | |
740 | $arg = "--dport"; | |
741 | } | |
742 | ||
743 | my @options = (); | |
744 | ||
745 | if ($ports =~ /\|/) { | |
746 | $ports =~ s/\|/,/g; | |
747 | push(@options, ("-m", "multiport")); | |
748 | } | |
749 | ||
1c3044d7 MT |
750 | if ($ports) { |
751 | push(@options, ($arg, $ports)); | |
752 | } | |
8f4f4634 MT |
753 | |
754 | return @options; | |
755 | } | |
756 | ||
757 | sub get_dnat_target_port { | |
758 | my $hash = shift; | |
759 | my $key = shift; | |
760 | ||
761 | if ($$hash{$key}[14] eq "TGT_PORT") { | |
1c3044d7 MT |
762 | my $port = $$hash{$key}[15]; |
763 | my $external_port = $$hash{$key}[30]; | |
764 | ||
765 | if ($external_port && ($port ne $external_port)) { | |
766 | return $$hash{$key}[15]; | |
767 | } | |
8f4f4634 | 768 | } |
2a81ab0d | 769 | } |
6e87f0aa MT |
770 | |
771 | sub add_dnat_mangle_rules { | |
772 | my $nat_address = shift; | |
48f07c19 | 773 | my $interface = shift; |
6e87f0aa MT |
774 | my @options = @_; |
775 | ||
776 | my $mark = 0; | |
777 | foreach my $zone ("GREEN", "BLUE", "ORANGE") { | |
778 | $mark++; | |
779 | ||
780 | # Skip rule if not all required information exists. | |
781 | next unless (exists $defaultNetworks{$zone . "_NETADDRESS"}); | |
782 | next unless (exists $defaultNetworks{$zone . "_NETMASK"}); | |
783 | ||
48f07c19 AM |
784 | next if ($interface && $interface ne $defaultNetworks{$zone . "_DEV"}); |
785 | ||
6e87f0aa MT |
786 | my @mangle_options = @options; |
787 | ||
788 | my $netaddress = $defaultNetworks{$zone . "_NETADDRESS"}; | |
789 | $netaddress .= "/" . $defaultNetworks{$zone . "_NETMASK"}; | |
790 | ||
791 | push(@mangle_options, ("-s", $netaddress, "-d", $nat_address)); | |
792 | push(@mangle_options, ("-j", "MARK", "--set-mark", $mark)); | |
793 | ||
794 | run("$IPTABLES -t mangle -A $CHAIN_MANGLE_NAT_DESTINATION_FIX @mangle_options"); | |
795 | } | |
796 | } | |
3bb4bb3f MT |
797 | |
798 | sub make_log_limit_options { | |
799 | my @options = ("-m", "limit"); | |
800 | ||
801 | # Maybe we should get this from the configuration. | |
802 | my $limit = 10; | |
803 | ||
804 | # We limit log messages to $limit messages per minute. | |
805 | push(@options, ("--limit", "$limit/min")); | |
806 | ||
807 | # And we allow bursts of 2x $limit. | |
808 | push(@options, ("--limit-burst", $limit * 2)); | |
809 | ||
810 | return @options; | |
811 | } | |
e9b5ba41 | 812 | |
da7a2208 MT |
813 | sub firewall_is_in_subnet { |
814 | my $subnet = shift; | |
5cf8c8c1 | 815 | |
e9b5ba41 MT |
816 | # ORANGE is missing here, because nothing may ever access |
817 | # the firewall from this network. | |
4e54e3c6 | 818 | my $address = &fwlib::get_internal_firewall_ip_address($subnet, 0); |
e9b5ba41 | 819 | |
da7a2208 MT |
820 | if ($address) { |
821 | return 1; | |
e9b5ba41 | 822 | } |
da7a2208 MT |
823 | |
824 | return 0; | |
e9b5ba41 | 825 | } |