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8dcebe53 SS |
1 | #!/usr/bin/perl -w |
2 | ############################################################################ | |
3 | # # | |
4 | # This file is part of the IPFire Firewall. # | |
5 | # # | |
6 | # IPFire is free software; you can redistribute it and/or modify # | |
7 | # it under the terms of the GNU General Public License as published by # | |
8 | # the Free Software Foundation; either version 2 of the License, or # | |
9 | # (at your option) any later version. # | |
10 | # # | |
11 | # IPFire is distributed in the hope that it will be useful, # | |
12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
14 | # GNU General Public License for more details. # | |
15 | # # | |
16 | # You should have received a copy of the GNU General Public License # | |
17 | # along with IPFire; if not, write to the Free Software # | |
18 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA # | |
19 | # # | |
fd2dccaa | 20 | # Copyright (C) 2018-2019 IPFire Team <info@ipfire.org> # |
8dcebe53 SS |
21 | # # |
22 | ############################################################################ | |
23 | ||
e55fa2f7 SS |
24 | use strict; |
25 | ||
8dcebe53 SS |
26 | package IDS; |
27 | ||
28 | require '/var/ipfire/general-functions.pl'; | |
abffcc99 | 29 | require "${General::swroot}/network-functions.pl"; |
35bc92a3 | 30 | require "${General::swroot}/suricata/ruleset-sources"; |
8dcebe53 | 31 | |
7d895608 SS |
32 | # Load perl module to deal with Archives. |
33 | use Archive::Tar; | |
34 | ||
35 | # Load perl module to deal with files and path. | |
36 | use File::Basename; | |
37 | ||
38 | # Load module to move files. | |
39 | use File::Copy; | |
40 | ||
41 | # Load module to recursely remove files and a folder. | |
42 | use File::Path qw(rmtree); | |
43 | ||
44 | # Load module to get file stats. | |
45 | use File::stat; | |
46 | ||
47 | # Load module to deal with temporary files. | |
48 | use File::Temp; | |
49 | ||
061391e7 SS |
50 | # Load module to deal with the date formats used by the HTTP protocol. |
51 | use HTTP::Date; | |
52 | ||
7d895608 SS |
53 | # Load the libwwwperl User Agent module. |
54 | use LWP::UserAgent; | |
55 | ||
56 | # Load function from posix module to format time strings. | |
57 | use POSIX qw (strftime); | |
58 | ||
59 | # Load module to talk to the kernel log daemon. | |
60 | use Sys::Syslog qw(:DEFAULT setlogsock); | |
61 | ||
02844177 | 62 | # Location where all config and settings files are stored. |
164eab66 | 63 | our $settingsdir = "${General::swroot}/suricata"; |
02844177 | 64 | |
ddaf8ae1 | 65 | # File where the main file for providers ruleset inclusion exists. |
8d6714ed | 66 | our $suricata_used_rulesfiles_file = "$settingsdir/suricata-used-rulesfiles.yaml"; |
88eb5626 | 67 | |
b02e30fd SS |
68 | # File where the addresses of the homenet are stored. |
69 | our $homenet_file = "$settingsdir/suricata-homenet.yaml"; | |
70 | ||
30ee98e9 SS |
71 | # File where the addresses of the used DNS servers are stored. |
72 | our $dns_servers_file = "$settingsdir/suricata-dns-servers.yaml"; | |
73 | ||
e698090e SS |
74 | # File where the HTTP ports definition is stored. |
75 | our $http_ports_file = "$settingsdir/suricata-http-ports.yaml"; | |
76 | ||
b02e30fd SS |
77 | # File which stores the configured IPS settings. |
78 | our $ids_settings_file = "$settingsdir/settings"; | |
79 | ||
a8d36d3e SS |
80 | # File which stores the used and configured ruleset providers. |
81 | our $providers_settings_file = "$settingsdir/providers-settings"; | |
82 | ||
b02e30fd SS |
83 | # File which stores the configured settings for whitelisted addresses. |
84 | our $ignored_file = "$settingsdir/ignored"; | |
85 | ||
990d111d SS |
86 | # File which stores HTTP Etags for providers which supports them |
87 | # for cache management. | |
88 | our $etags_file = "$settingsdir/etags"; | |
89 | ||
788a71f5 SS |
90 | # Location where the downloaded rulesets are stored. |
91 | our $dl_rules_path = "/var/tmp"; | |
92 | ||
3983aebd | 93 | # File to store any errors, which also will be read and displayed by the wui. |
77910792 | 94 | our $storederrorfile = "/tmp/ids_storederror"; |
3983aebd | 95 | |
8076deba SS |
96 | # File to lock the WUI, while the autoupdate script runs. |
97 | our $ids_page_lock_file = "/tmp/ids_page_locked"; | |
98 | ||
298ef5ba | 99 | # Location where the rulefiles are stored. |
21cab141 | 100 | our $rulespath = "/var/lib/suricata"; |
298ef5ba | 101 | |
43d12991 SS |
102 | # Location where the default rulefils are stored. |
103 | our $default_rulespath = "/usr/share/suricata/rules"; | |
104 | ||
6983a96e SS |
105 | # Location where the addition config files are stored. |
106 | our $configspath = "/usr/share/suricata"; | |
107 | ||
23b56052 | 108 | # Location of the classification file. |
6983a96e | 109 | our $classification_file = "$configspath/classification.config"; |
23b56052 | 110 | |
8bd74e12 SS |
111 | # Location of the sid to msg mappings file. |
112 | our $sid_msg_file = "$rulespath/sid-msg.map"; | |
113 | ||
612bb2df SS |
114 | # Location to store local rules. This file will not be touched. |
115 | our $local_rules_file = "$rulespath/local.rules"; | |
116 | ||
b02e30fd SS |
117 | # File which contains the rules to whitelist addresses on suricata. |
118 | our $whitelist_file = "$rulespath/whitelist.rules"; | |
119 | ||
bce84f39 SS |
120 | # File which contains a list of all supported ruleset sources. |
121 | # (Sourcefire, Emergingthreads, etc..) | |
122 | our $rulesetsourcesfile = "$settingsdir/ruleset-sources"; | |
123 | ||
796eea21 SS |
124 | # The pidfile of the IDS. |
125 | our $idspidfile = "/var/run/suricata.pid"; | |
126 | ||
5240a809 SS |
127 | # Location of suricatactrl. |
128 | my $suricatactrl = "/usr/local/bin/suricatactrl"; | |
129 | ||
788a71f5 SS |
130 | # Prefix for each downloaded ruleset. |
131 | my $dl_rulesfile_prefix = "idsrules"; | |
132 | ||
0fbfffea SS |
133 | # Temporary directory where the rulesets will be extracted. |
134 | my $tmp_directory = "/tmp/ids_tmp"; | |
135 | ||
6c9d3eee SS |
136 | # Temporary directory where the extracted rules files will be stored. |
137 | my $tmp_rules_directory = "$tmp_directory/rules"; | |
138 | ||
139 | # Temporary directory where the extracted additional config files will be stored. | |
140 | my $tmp_conf_directory = "$tmp_directory/conf"; | |
141 | ||
5240a809 | 142 | # Array with allowed commands of suricatactrl. |
ed06bc81 SS |
143 | my @suricatactrl_cmds = ( 'start', 'stop', 'restart', 'reload', 'fix-rules-dir', 'cron' ); |
144 | ||
145 | # Array with supported cron intervals. | |
146 | my @cron_intervals = ('off', 'daily', 'weekly' ); | |
5240a809 | 147 | |
e698090e SS |
148 | # Array which contains the HTTP ports, which statically will be declared as HTTP_PORTS in the |
149 | # http_ports_file. | |
150 | my @http_ports = ('80', '81'); | |
151 | ||
88eb5626 | 152 | # Array which contains a list of rulefiles which always will be included if they exist. |
bb39fac4 SS |
153 | my @static_included_rulefiles = ('local.rules', 'whitelist.rules'); |
154 | ||
155 | # Array which contains a list of allways enabled application layer protocols. | |
156 | my @static_enabled_app_layer_protos = ('app-layer', 'decoder', 'files', 'stream'); | |
88eb5626 | 157 | |
788a71f5 SS |
158 | # Hash which allows to convert the download type (dl_type) to a file suffix. |
159 | my %dl_type_to_suffix = ( | |
160 | "archive" => ".tar.gz", | |
161 | "plain" => ".rules", | |
162 | ); | |
163 | ||
43d12991 SS |
164 | # Hash to translate an application layer protocol to the application name. |
165 | my %tr_app_layer_proto = ( | |
166 | "ikev2" => "ipsec", | |
167 | "krb5" => "kerberos", | |
168 | ); | |
169 | ||
b02e30fd SS |
170 | # |
171 | ## Function to check and create all IDS related files, if the does not exist. | |
172 | # | |
173 | sub check_and_create_filelayout() { | |
174 | # Check if the files exist and if not, create them. | |
8d6714ed | 175 | unless (-f "$suricata_used_rulesfiles_file") { &create_empty_file($suricata_used_rulesfiles_file); } |
b02e30fd | 176 | unless (-f "$ids_settings_file") { &create_empty_file($ids_settings_file); } |
a8d36d3e | 177 | unless (-f "$providers_settings_file") { &create_empty_file($providers_settings_file); } |
b02e30fd SS |
178 | unless (-f "$whitelist_file" ) { &create_empty_file($whitelist_file); } |
179 | } | |
180 | ||
70cc1315 SS |
181 | # |
182 | ## Function to get a list of all available ruleset providers. | |
183 | ## | |
184 | ## They will be returned as a sorted array. | |
185 | # | |
186 | sub get_ruleset_providers() { | |
187 | my @providers; | |
188 | ||
189 | # Loop through the hash of providers. | |
190 | foreach my $provider ( keys %IDS::Ruleset::Providers ) { | |
191 | # Add the provider to the array. | |
192 | push(@providers, $provider); | |
193 | } | |
194 | ||
195 | # Sort and return the array. | |
196 | return sort(@providers); | |
197 | } | |
198 | ||
5e20d6cb SS |
199 | # |
200 | ## Function to get a list of all enabled ruleset providers. | |
201 | ## | |
202 | ## They will be returned as an array. | |
203 | # | |
204 | sub get_enabled_providers () { | |
205 | my %used_providers = (); | |
206 | ||
207 | # Array to store the enabled providers. | |
208 | my @enabled_providers = (); | |
209 | ||
210 | # Read-in the providers config file. | |
211 | &General::readhasharray("$providers_settings_file", \%used_providers); | |
212 | ||
213 | # Loop through the hash of used_providers. | |
214 | foreach my $id (keys %used_providers) { | |
215 | # Skip disabled providers. | |
216 | next unless ($used_providers{$id}[3] eq "enabled"); | |
217 | ||
218 | # Grab the provider handle. | |
219 | my $provider = "$used_providers{$id}[0]"; | |
220 | ||
221 | # Add the provider to the array of enabled providers. | |
222 | push(@enabled_providers, $provider); | |
223 | } | |
224 | ||
225 | # Return the array. | |
226 | return @enabled_providers; | |
227 | } | |
228 | ||
e0eb5bc7 SS |
229 | # |
230 | ## Function to get a hash of provider handles and their configured modes (IDS/IPS). | |
231 | # | |
232 | sub get_providers_mode () { | |
233 | my %used_providers = (); | |
234 | ||
235 | # Hash to store the providers and their configured modes. | |
236 | my %providers_mode = (); | |
237 | ||
238 | # Read-in the providers config file. | |
239 | &General::readhasharray("$providers_settings_file", \%used_providers); | |
240 | ||
241 | # Loop through the hash of used_providers. | |
242 | foreach my $id (keys %used_providers) { | |
243 | # Skip disabled providers. | |
244 | next unless ($used_providers{$id}[3] eq "enabled"); | |
245 | ||
246 | # Grab the provider handle. | |
247 | my $provider = "$used_providers{$id}[0]"; | |
248 | ||
249 | # Grab the provider mode. | |
250 | my $mode = "$used_providers{$id}[4]"; | |
251 | ||
252 | # Fall back to IDS if no mode could be obtained. | |
253 | unless($mode) { | |
254 | $mode = "IDS"; | |
255 | } | |
256 | ||
257 | # Add details to provider_modes hash. | |
258 | $providers_mode{$provider} = $mode; | |
259 | } | |
260 | ||
261 | # Return the hash. | |
262 | return %providers_mode; | |
263 | } | |
264 | ||
8dcebe53 SS |
265 | # |
266 | ## Function for checking if at least 300MB of free disk space are available | |
267 | ## on the "/var" partition. | |
268 | # | |
269 | sub checkdiskspace () { | |
270 | # Call diskfree to gather the free disk space of /var. | |
81631920 | 271 | my @df = &General::system_output("/bin/df", "-B", "M", "/var"); |
8dcebe53 SS |
272 | |
273 | # Loop through the output. | |
274 | foreach my $line (@df) { | |
275 | # Ignore header line. | |
276 | next if $line =~ m/^Filesystem/; | |
277 | ||
278 | # Search for a line with the device information. | |
279 | if ($line =~ m/dev/ ) { | |
280 | # Split the line into single pieces. | |
281 | my @values = split(' ', $line); | |
282 | my ($filesystem, $blocks, $used, $available, $used_perenctage, $mounted_on) = @values; | |
283 | ||
284 | # Check if the available disk space is more than 300MB. | |
285 | if ($available < 300) { | |
65e3aef5 SS |
286 | # Exit function and return the available disk space. |
287 | return $available; | |
8dcebe53 SS |
288 | } |
289 | } | |
290 | } | |
291 | ||
292 | # Everything okay, return nothing. | |
293 | return; | |
294 | } | |
295 | ||
eea2670b | 296 | # |
0f2c5211 | 297 | ## This function is responsible for downloading the ruleset for a given provider. |
eea2670b | 298 | ## |
0f2c5211 | 299 | ## * At first it initialize the downloader and sets an upstream proxy if configured. |
b3c2c336 | 300 | ## * The next step will be to generate the final download url, by obtaining the URL for the desired |
0f2c5211 SS |
301 | ## ruleset and add the settings for the upstream proxy. |
302 | ## * Finally the function will grab the rule file or tarball from the server. | |
303 | ## It tries to reduce the amount of download by using the "If-Modified-Since" HTTP header. | |
eea2670b | 304 | # |
e26edcc1 SS |
305 | ## Return codes: |
306 | ## | |
307 | ## * "no url" - If no download URL could be gathered for the provider. | |
308 | ## * "not modified" - In case the already stored rules file is up to date. | |
309 | ## * "incomplete download" - When the remote file size differs from the downloaded file size. | |
310 | ## * "$error" - The error message generated from the LWP::User Agent module. | |
311 | # | |
b3c2c336 SS |
312 | sub downloadruleset ($) { |
313 | my ($provider) = @_; | |
314 | ||
e71804fb SS |
315 | # The amount of download attempts before giving up and |
316 | # logging an error. | |
317 | my $max_dl_attempts = 3; | |
318 | ||
eea2670b SS |
319 | # Read proxysettings. |
320 | my %proxysettings=(); | |
321 | &General::readhash("${General::swroot}/proxy/settings", \%proxysettings); | |
322 | ||
eea2670b | 323 | # Init the download module. |
954dbdad SS |
324 | # |
325 | # Request SSL hostname verification and specify path | |
326 | # to the CA file. | |
327 | my $downloader = LWP::UserAgent->new( | |
328 | ssl_opts => { | |
329 | SSL_ca_file => '/etc/ssl/cert.pem', | |
330 | verify_hostname => 1, | |
331 | } | |
332 | ); | |
eea2670b SS |
333 | |
334 | # Set timeout to 10 seconds. | |
335 | $downloader->timeout(10); | |
336 | ||
337 | # Check if an upstream proxy is configured. | |
338 | if ($proxysettings{'UPSTREAM_PROXY'}) { | |
eea2670b SS |
339 | my $proxy_url; |
340 | ||
40407aee | 341 | $proxy_url = "http://"; |
eea2670b | 342 | |
40407aee PM |
343 | # Check if the proxy requires authentication. |
344 | if (($proxysettings{'UPSTREAM_USER'}) && ($proxysettings{'UPSTREAM_PASSWORD'})) { | |
345 | $proxy_url .= "$proxysettings{'UPSTREAM_USER'}\:$proxysettings{'UPSTREAM_PASSWORD'}\@"; | |
eea2670b SS |
346 | } |
347 | ||
40407aee PM |
348 | # Add proxy server address and port. |
349 | $proxy_url .= $proxysettings{'UPSTREAM_PROXY'}; | |
350 | ||
eea2670b | 351 | # Setup proxy settings. |
6994f001 | 352 | $downloader->proxy(['http', 'https'], $proxy_url); |
eea2670b SS |
353 | } |
354 | ||
0f2c5211 SS |
355 | # Grab the download url for the provider. |
356 | my $url = $IDS::Ruleset::Providers{$provider}{'dl_url'}; | |
b3c2c336 | 357 | |
0f2c5211 SS |
358 | # Check if the provider requires a subscription. |
359 | if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") { | |
360 | # Grab the subscription code. | |
361 | my $subscription_code = &get_subscription_code($provider); | |
b3c2c336 | 362 | |
0f2c5211 SS |
363 | # Add the subscription code to the download url. |
364 | $url =~ s/\<subscription_code\>/$subscription_code/g; | |
b3c2c336 | 365 | |
0f2c5211 | 366 | } |
f264adda | 367 | |
52a557a8 SS |
368 | # Abort and return "no url", if no url could be determined for the provider. |
369 | return "no url" unless ($url); | |
96da5803 | 370 | |
0f2c5211 SS |
371 | # Pass the requested URL to the downloader. |
372 | my $request = HTTP::Request->new(GET => $url); | |
061391e7 | 373 | |
0f2c5211 SS |
374 | # Generate temporary file name, located in "/var/tmp" and with a suffix of ".tmp". |
375 | # The downloaded file will be stored there until some sanity checks are performed. | |
376 | my $tmp = File::Temp->new( SUFFIX => ".tmp", DIR => "/var/tmp/", UNLINK => 0 ); | |
377 | my $tmpfile = $tmp->filename(); | |
061391e7 | 378 | |
0f2c5211 SS |
379 | # Call function to get the final path and filename for the downloaded file. |
380 | my $dl_rulesfile = &_get_dl_rulesfile($provider); | |
061391e7 | 381 | |
0f2c5211 SS |
382 | # Check if the rulesfile already exits, because it has been downloaded in the past. |
383 | # | |
384 | # In this case we are requesting the server if the remote file has been changed or not. | |
385 | # This will be done by sending the modification time in a special HTTP header. | |
386 | if (-f $dl_rulesfile) { | |
387 | # Call stat on the file. | |
388 | my $stat = stat($dl_rulesfile); | |
061391e7 | 389 | |
0f2c5211 SS |
390 | # Omit the mtime of the existing file. |
391 | my $mtime = $stat->mtime; | |
061391e7 | 392 | |
0f2c5211 SS |
393 | # Convert the timestamp into right format. |
394 | my $http_date = time2str($mtime); | |
96da5803 | 395 | |
0f2c5211 SS |
396 | # Add the If-Modified-Since header to the request to ask the server if the |
397 | # file has been modified. | |
398 | $request->header( 'If-Modified-Since' => "$http_date" ); | |
399 | } | |
96da5803 | 400 | |
990d111d SS |
401 | # Read-in Etags file for known Etags if the file is present. |
402 | my %etags = (); | |
403 | &General::readhash("$etags_file", \%etags) if (-f $etags_file); | |
404 | ||
405 | # Check if an Etag for the current provider is stored. | |
406 | if ($etags{$provider}) { | |
407 | # Grab the stored tag. | |
408 | my $etag = $etags{$provider}; | |
409 | ||
410 | # Add an "If-None-Match header to the request to ask the server if the | |
411 | # file has been modified. | |
412 | $request->header( 'If-None-Match' => $etag ); | |
413 | } | |
414 | ||
0f2c5211 SS |
415 | my $dl_attempt = 1; |
416 | my $response; | |
155b3b56 | 417 | |
0f2c5211 SS |
418 | # Download and retry on failure. |
419 | while ($dl_attempt <= $max_dl_attempts) { | |
420 | # Perform the request and save the output into the tmpfile. | |
421 | $response = $downloader->request($request, $tmpfile); | |
061391e7 | 422 | |
0f2c5211 SS |
423 | # Check if the download was successfull. |
424 | if($response->is_success) { | |
425 | # Break loop. | |
426 | last; | |
061391e7 | 427 | |
0f2c5211 SS |
428 | # Check if the server responds with 304 (Not Modified). |
429 | } elsif ($response->code == 304) { | |
e26edcc1 SS |
430 | # Return "not modified". |
431 | return "not modified"; | |
e71804fb | 432 | |
0f2c5211 SS |
433 | # Check if we ran out of download re-tries. |
434 | } elsif ($dl_attempt eq $max_dl_attempts) { | |
435 | # Obtain error. | |
436 | my $error = $response->content; | |
e71804fb | 437 | |
e26edcc1 SS |
438 | # Return the error message from response.. |
439 | return "$error"; | |
155b3b56 | 440 | } |
96da5803 | 441 | |
0f2c5211 SS |
442 | # Remove temporary file, if one exists. |
443 | unlink("$tmpfile") if (-e "$tmpfile"); | |
de1199e2 | 444 | |
0f2c5211 SS |
445 | # Increase download attempt counter. |
446 | $dl_attempt++; | |
447 | } | |
061391e7 | 448 | |
0f2c5211 SS |
449 | # Obtain the connection headers. |
450 | my $headers = $response->headers; | |
de1199e2 | 451 | |
0f2c5211 SS |
452 | # Get the timestamp from header, when the file has been modified the |
453 | # last time. | |
454 | my $last_modified = $headers->last_modified; | |
96da5803 | 455 | |
0f2c5211 SS |
456 | # Get the remote size of the downloaded file. |
457 | my $remote_filesize = $headers->content_length; | |
25b6545a | 458 | |
990d111d SS |
459 | # Grab the Etag from response it the server provides one. |
460 | if ($response->header('Etag')) { | |
461 | # Add the Etag to the etags hash. | |
462 | $etags{$provider} = $response->header('Etag'); | |
463 | ||
464 | # Write the etags file. | |
465 | &General::writehash($etags_file, \%etags); | |
466 | } | |
467 | ||
0f2c5211 SS |
468 | # Perform stat on the tmpfile. |
469 | my $stat = stat($tmpfile); | |
eea2670b | 470 | |
0f2c5211 SS |
471 | # Grab the local filesize of the downloaded tarball. |
472 | my $local_filesize = $stat->size; | |
88daf7eb | 473 | |
0f2c5211 SS |
474 | # Check if both file sizes match. |
475 | if (($remote_filesize) && ($remote_filesize ne $local_filesize)) { | |
0f2c5211 SS |
476 | # Delete temporary file. |
477 | unlink("$tmpfile"); | |
96da5803 | 478 | |
0f2c5211 | 479 | # Return "1" - false. |
e26edcc1 | 480 | return "incomplete download"; |
0f2c5211 | 481 | } |
96da5803 | 482 | |
0f2c5211 SS |
483 | # Overwrite the may existing rulefile or tarball with the downloaded one. |
484 | move("$tmpfile", "$dl_rulesfile"); | |
ae226132 | 485 | |
0f2c5211 SS |
486 | # Check if we got a last-modified value from the server. |
487 | if ($last_modified) { | |
488 | # Assign the last-modified timestamp as mtime to the | |
489 | # rules file. | |
490 | utime(time(), "$last_modified", "$dl_rulesfile"); | |
96da5803 SS |
491 | } |
492 | ||
0f2c5211 SS |
493 | # Delete temporary file. |
494 | unlink("$tmpfile"); | |
495 | ||
496 | # Set correct ownership for the tarball. | |
497 | set_ownership("$dl_rulesfile"); | |
498 | ||
eea2670b SS |
499 | # If we got here, everything worked fine. Return nothing. |
500 | return; | |
501 | } | |
8dcebe53 | 502 | |
0fbfffea SS |
503 | # |
504 | ## Function to extract a given ruleset. | |
1b5aec1b SS |
505 | ## |
506 | ## In case the ruleset provider offers a plain file, it simply will | |
507 | ## be copied. | |
0fbfffea SS |
508 | # |
509 | sub extractruleset ($) { | |
510 | my ($provider) = @_; | |
511 | ||
8353e28a SS |
512 | # Disable chown functionality when uncompressing files. |
513 | $Archive::Tar::CHOWN = "0"; | |
514 | ||
0fbfffea SS |
515 | # Get full path and downloaded rulesfile for the given provider. |
516 | my $tarball = &_get_dl_rulesfile($provider); | |
517 | ||
518 | # Check if the file exists. | |
519 | unless (-f $tarball) { | |
1b5aec1b | 520 | &_log_to_syslog("Could not find ruleset file: $tarball"); |
0fbfffea SS |
521 | |
522 | # Return nothing. | |
523 | return; | |
524 | } | |
525 | ||
0fbfffea SS |
526 | # Check if the temporary directories exist, otherwise create them. |
527 | mkdir("$tmp_directory") unless (-d "$tmp_directory"); | |
6c9d3eee SS |
528 | mkdir("$tmp_rules_directory") unless (-d "$tmp_rules_directory"); |
529 | mkdir("$tmp_conf_directory") unless (-d "$tmp_conf_directory"); | |
0fbfffea | 530 | |
1b5aec1b SS |
531 | # Omit the type (dl_type) of the stored ruleset. |
532 | my $type = $IDS::Ruleset::Providers{$provider}{'dl_type'}; | |
0fbfffea | 533 | |
1b5aec1b SS |
534 | # Handle the different ruleset types. |
535 | if ($type eq "plain") { | |
536 | # Generate destination filename an full path. | |
537 | my $destination = "$tmp_rules_directory/$provider\-ruleset.rules"; | |
0fbfffea | 538 | |
1b5aec1b SS |
539 | # Copy the file into the temporary rules directory. |
540 | copy($tarball, $destination); | |
0fbfffea | 541 | |
1b5aec1b SS |
542 | } elsif ( $type eq "archive") { |
543 | # Initialize the tar module. | |
544 | my $tar = Archive::Tar->new($tarball); | |
0fbfffea | 545 | |
1b5aec1b SS |
546 | # Get the filelist inside the tarball. |
547 | my @packed_files = $tar->list_files; | |
0fbfffea | 548 | |
1b5aec1b SS |
549 | # Loop through the filelist. |
550 | foreach my $packed_file (@packed_files) { | |
551 | my $destination; | |
0fbfffea | 552 | |
1b5aec1b SS |
553 | # Splitt the packed file into chunks. |
554 | my $file = fileparse($packed_file); | |
0fbfffea | 555 | |
1b5aec1b SS |
556 | # Handle msg-id.map file. |
557 | if ("$file" eq "sid-msg.map") { | |
558 | # Set extract destination to temporary config_dir. | |
559 | $destination = "$tmp_conf_directory/$provider\-sid-msg.map"; | |
0fbfffea | 560 | |
1b5aec1b SS |
561 | # Handle classification.conf |
562 | } elsif ("$file" eq "classification.config") { | |
563 | # Set extract destination to temporary config_dir. | |
564 | $destination = "$tmp_conf_directory/$provider\-classification.config"; | |
0fbfffea | 565 | |
1b5aec1b SS |
566 | # Handle rules files. |
567 | } elsif ($file =~ m/\.rules$/) { | |
f349c960 SS |
568 | # Skip rule files which are not located in the rules directory or archive root. |
569 | next unless(($packed_file =~ /^rules\//) || ($packed_file !~ /\//)); | |
570 | ||
10beae64 SS |
571 | # Skip deleted.rules. |
572 | # | |
573 | # Mostly they have been taken out for correctness or performance reasons and therfore | |
574 | # it is not a great idea to enable any of them. | |
575 | next if($file =~ m/deleted.rules$/); | |
576 | ||
1b5aec1b | 577 | my $rulesfilename; |
0fbfffea | 578 | |
1b5aec1b SS |
579 | # Splitt the filename into chunks. |
580 | my @filename = split("-", $file); | |
0fbfffea | 581 | |
1b5aec1b SS |
582 | # Reverse the array. |
583 | @filename = reverse(@filename); | |
0fbfffea | 584 | |
1b5aec1b SS |
585 | # Get the amount of elements in the array. |
586 | my $elements = @filename; | |
0fbfffea | 587 | |
1b5aec1b SS |
588 | # Remove last element of the hash. |
589 | # It contains the vendor name, which will be replaced. | |
590 | if ($elements >= 3) { | |
591 | # Remove last element from hash. | |
592 | pop(@filename); | |
593 | } | |
594 | ||
595 | # Check if the last element of the filename does not | |
596 | # contain the providers name. | |
597 | if ($filename[-1] ne "$provider") { | |
598 | # Add provider name as last element. | |
599 | push(@filename, $provider); | |
600 | } | |
601 | ||
602 | # Reverse the array back. | |
603 | @filename = reverse(@filename); | |
604 | ||
605 | # Generate the name for the rulesfile. | |
606 | $rulesfilename = join("-", @filename); | |
607 | ||
608 | # Set extract destination to temporaray rules_dir. | |
609 | $destination = "$tmp_rules_directory/$rulesfilename"; | |
610 | } else { | |
611 | # Skip all other files. | |
612 | next; | |
613 | } | |
614 | ||
2b12a010 SS |
615 | # Check if the destination file exists. |
616 | unless(-e "$destination") { | |
617 | # Extract the file to the temporary directory. | |
618 | $tar->extract_file("$packed_file", "$destination"); | |
619 | } else { | |
2b12a010 SS |
620 | # Generate temporary file name, located in the temporary rules directory and a suffix of ".tmp". |
621 | my $tmp = File::Temp->new( SUFFIX => ".tmp", DIR => "$tmp_rules_directory", UNLINK => 0 ); | |
622 | my $tmpfile = $tmp->filename(); | |
623 | ||
624 | # Extract the file to the new temporary file name. | |
625 | $tar->extract_file("$packed_file", "$tmpfile"); | |
626 | ||
627 | # Open the the existing file. | |
628 | open(DESTFILE, ">>", "$destination") or die "Could not open $destination. $!\n"; | |
629 | open(TMPFILE, "<", "$tmpfile") or die "Could not open $tmpfile. $!\n"; | |
630 | ||
631 | # Loop through the content of the temporary file. | |
632 | while (<TMPFILE>) { | |
633 | # Append the content line by line to the destination file. | |
634 | print DESTFILE "$_"; | |
635 | } | |
636 | ||
637 | # Close the file handles. | |
638 | close(TMPFILE); | |
639 | close(DESTFILE); | |
640 | ||
641 | # Remove the temporary file. | |
642 | unlink("$tmpfile"); | |
643 | } | |
1b5aec1b | 644 | } |
0fbfffea SS |
645 | } |
646 | } | |
647 | ||
25f5cb0d | 648 | # |
b953677b SS |
649 | ## A wrapper function to call the oinkmaster script, setup the rules structues and |
650 | ## call the functions to merge the additional config files. (classification, sid-msg, etc.). | |
25f5cb0d SS |
651 | # |
652 | sub oinkmaster () { | |
330759d8 SS |
653 | # Check if the files in rulesdir have the correct permissions. |
654 | &_check_rulesdir_permissions(); | |
655 | ||
b953677b | 656 | # Cleanup the rules directory before filling it with the new rulests. |
883820bd SS |
657 | &_cleanup_rulesdir(); |
658 | ||
0130e0d1 | 659 | # Get all enabled providers. |
e31458de | 660 | my @enabled_providers = &get_enabled_providers(); |
b953677b | 661 | |
0130e0d1 SS |
662 | # Loop through the array of enabled providers. |
663 | foreach my $provider (@enabled_providers) { | |
1b5aec1b SS |
664 | # Call the extractruleset function. |
665 | &extractruleset($provider); | |
b953677b SS |
666 | } |
667 | ||
79446948 SS |
668 | # Call function to process the ruleset and do all modifications. |
669 | &process_ruleset(@enabled_providers); | |
b953677b | 670 | |
b953677b SS |
671 | # Call function to merge the classification files. |
672 | &merge_classifications(@enabled_providers); | |
673 | ||
674 | # Call function to merge the sid to message mapping files. | |
675 | &merge_sid_msg(@enabled_providers); | |
676 | ||
677 | # Cleanup temporary directory. | |
16b2d281 | 678 | &cleanup_tmp_directory(); |
25f5cb0d SS |
679 | } |
680 | ||
5a6c7bbe SS |
681 | # |
682 | ## Function to alter the ruleset. | |
683 | # | |
684 | sub process_ruleset(@) { | |
685 | my (@providers) = @_; | |
686 | ||
687 | # Hash to store the configured provider modes. | |
688 | my %providers_mode = &get_providers_mode(); | |
689 | ||
690 | # Array to store the extracted rulefile from the temporary rules directory. | |
691 | my @extracted_rulefiles; | |
692 | ||
693 | # Get names of the extracted raw rulefiles. | |
694 | opendir(DIR, $tmp_rules_directory) or die "Could not read from $tmp_rules_directory. $!\n"; | |
695 | while (my $file = readdir(DIR)) { | |
696 | # Ignore single and double dotted files. | |
697 | next if $file =~ /^\.\.?$/; | |
698 | ||
699 | # Add file to the array of extracted files. | |
700 | push(@extracted_rulefiles, $file); | |
701 | } | |
702 | ||
703 | # Close directory handle. | |
704 | closedir(DIR); | |
705 | ||
706 | # Loop through the array of providers. | |
707 | foreach my $provider (@providers) { | |
708 | # Hash to store the obtained SIDs and REV of each provider. | |
709 | my %rules = (); | |
710 | ||
711 | # Hash which holds modifications to apply to the rules. | |
712 | my %modifications = (); | |
713 | ||
714 | # Loop through the array of extraced rulefiles. | |
715 | foreach my $file (@extracted_rulefiles) { | |
716 | # Skip file if it does not belong to the current processed provider. | |
717 | next unless ($file =~ m/^$provider/); | |
718 | ||
719 | # Open the rulefile. | |
720 | open(FILE, "$tmp_rules_directory/$file") or die "Could not read $tmp_rules_directory/$file. $!\n"; | |
721 | ||
722 | # Loop through the file content. | |
723 | while (my $line = <FILE>) { | |
724 | # Skip blank lines. | |
725 | next if ($line =~ /^\s*$/); | |
726 | ||
727 | # Call function to get the sid and rev of the rule. | |
728 | my ($sid, $rev) = &_get_sid_and_rev($line); | |
729 | ||
730 | # Skip rule if a sid with a higher rev already has added to the rules hash. | |
731 | next if ($rev le $rules{$sid}); | |
732 | ||
733 | # Add the new or rule with higher rev to the hash of rules. | |
734 | $rules{$sid} = $rev; | |
735 | } | |
736 | ||
737 | # Close file handle. | |
738 | close(FILE); | |
739 | } | |
740 | ||
741 | # Get filename which contains the ruleset modifications for this provider. | |
742 | my $modification_file = &get_provider_ruleset_modifications_file($provider); | |
743 | ||
744 | # Read file which holds the modifications of the ruleset for the current provider. | |
745 | &General::readhash($modification_file, \%modifications) if (-f $modification_file); | |
746 | ||
747 | # Loop again through the array of extracted rulesfiles. | |
748 | foreach my $file (@extracted_rulefiles) { | |
749 | # Skip the file if it does not belong to the current provider. | |
750 | next unless ($file =~ m/^$provider/); | |
751 | ||
752 | # Open the rulefile for writing. | |
753 | open(RULEFILE, ">", "$rulespath/$file") or die "Could not write to file $rulespath/$file. $!\n"; | |
754 | ||
755 | # Open the rulefile for reading. | |
756 | open(TMP_RULEFILE, "$tmp_rules_directory/$file") or die "Could not read $tmp_rules_directory/$file. $!\n"; | |
757 | ||
758 | # Loop through the raw temporary rulefile. | |
759 | while (my $line = <TMP_RULEFILE>) { | |
760 | # Get the sid and rev of the rule. | |
761 | my ($sid, $rev) = &_get_sid_and_rev($line); | |
762 | ||
763 | # Check if the current rule is obsoleted by a newer one. | |
764 | # | |
765 | # In this case the rev number in the rules hash is higher than the current one. | |
766 | next if ($rev lt $rules{$sid}); | |
767 | ||
768 | # Check if the rule should be enabled or disabled. | |
2deba6bf | 769 | if ($modifications{$sid} eq "enabled") { |
5a6c7bbe SS |
770 | # Drop the # at the start of the line. |
771 | $line =~ s/^\#//; | |
2deba6bf | 772 | } elsif ($modifications{$sid} eq "disabled") { |
5a6c7bbe SS |
773 | # Add a # at the start of the line to disable the rule. |
774 | $line = "#$line" unless ($line =~ /^#/); | |
775 | } | |
776 | ||
777 | # Check if the Provider is set so IPS mode. | |
778 | if ($providers_mode{$provider} eq "IPS") { | |
779 | # Replacements for sourcefire rules. | |
780 | $line =~ s/^#\s*(?:alert|drop)(.+policy balanced-ips alert)/alert${1}/; | |
781 | $line =~ s/^#\s*(?:alert|drop)(.+policy balanced-ips drop)/drop${1}/; | |
782 | ||
783 | # Replacements for generic rules. | |
784 | $line =~ s/^(#?)\s*(?:alert|drop)/${1}drop/; | |
785 | $line =~ s/^(#?)\s*drop(.+flowbits:noalert;)/${1}alert${2}/; | |
786 | } | |
787 | ||
788 | # Write line / rule to the target rule file. | |
789 | print RULEFILE "$line"; | |
790 | } | |
791 | ||
792 | # Close filehandles. | |
793 | close(RULEFILE); | |
794 | close(TMP_RULEFILE); | |
795 | } | |
796 | } | |
797 | } | |
798 | ||
23b56052 SS |
799 | # |
800 | ## Function to merge the classifications for a given amount of providers and write them | |
801 | ## to the classifications file. | |
802 | # | |
803 | sub merge_classifications(@) { | |
804 | my @providers = @_; | |
805 | ||
806 | # Hash to store all collected classifications. | |
807 | my %classifications = (); | |
808 | ||
809 | # Loop through the given array of providers. | |
810 | foreach my $provider (@providers) { | |
811 | # Generate full path to classification file. | |
6c9d3eee | 812 | my $classification_file = "$tmp_conf_directory/$provider\-classification.config"; |
23b56052 SS |
813 | |
814 | # Skip provider if no classification file exists. | |
815 | next unless (-f "$classification_file"); | |
816 | ||
817 | # Open the classification file. | |
818 | open(CLASSIFICATION, $classification_file) or die "Could not open file $classification_file. $!\n"; | |
819 | ||
820 | # Loop through the file content. | |
821 | while(<CLASSIFICATION>) { | |
822 | # Parse the file and grab the classification details. | |
823 | if ($_ =~/.*config classification\: (.*)/) { | |
824 | # Split the grabbed details. | |
825 | my ($short_name, $short_desc, $priority) = split("\,", $1); | |
826 | ||
827 | # Check if the grabbed classification is allready known and the priority value is greater | |
828 | # than the stored one (which causes less priority in the IDS). | |
829 | if (($classifications{$short_name}) && ($classifications{$short_name}[1] >= $priority)) { | |
830 | #Change the priority value to the stricter one. | |
831 | $classifications{$short_name} = [ "$classifications{$short_name}[0]", "$priority" ]; | |
832 | } else { | |
833 | # Add the classification to the hash. | |
834 | $classifications{$short_name} = [ "$short_desc", "$priority" ]; | |
835 | } | |
836 | } | |
837 | } | |
838 | ||
839 | # Close the file. | |
840 | close(CLASSIFICATION); | |
841 | } | |
842 | ||
843 | # Open classification file for writing. | |
844 | open(FILE, ">", "$classification_file") or die "Could not write to $classification_file. $!\n"; | |
845 | ||
846 | # Print notice about autogenerated file. | |
847 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n\n"; | |
848 | ||
849 | # Sort and loop through the hash of classifications. | |
850 | foreach my $key (sort keys %classifications) { | |
851 | # Assign some nice variable names for the items. | |
852 | my $short_name = $key; | |
853 | my $short_desc = $classifications{$key}[0]; | |
854 | my $priority = $classifications{$key}[1]; | |
855 | ||
856 | # Write the classification to the file. | |
857 | print FILE "config classification: $short_name,$short_desc,$priority\n"; | |
858 | } | |
859 | ||
860 | # Close file handle. | |
861 | close(FILE); | |
862 | } | |
863 | ||
8bd74e12 SS |
864 | # |
865 | ## Function to merge the "sid to message mapping" files of various given providers. | |
866 | # | |
867 | sub merge_sid_msg (@) { | |
868 | my @providers = @_; | |
869 | ||
870 | # Hash which contains all the sid to message mappings. | |
871 | my %mappings = (); | |
872 | ||
873 | # Loop through the array of given providers. | |
874 | foreach my $provider (@providers) { | |
875 | # Generate full path and filename. | |
6c9d3eee | 876 | my $sid_msg_file = "$tmp_conf_directory/$provider\-sid-msg.map"; |
8bd74e12 SS |
877 | |
878 | # Skip provider if no sid to msg mapping file for this provider exists. | |
879 | next unless (-f $sid_msg_file); | |
880 | ||
881 | # Open the file. | |
882 | open(MAPPING, $sid_msg_file) or die "Could not open $sid_msg_file. $!\n"; | |
883 | ||
884 | # Loop through the file content. | |
885 | while (<MAPPING>) { | |
886 | # Remove newlines. | |
887 | chomp($_); | |
888 | ||
889 | # Skip lines which do not start with a number, | |
890 | next unless ($_ =~ /^\d+/); | |
891 | ||
892 | # Split line content and assign it to an array. | |
893 | my @line = split(/ \|\| /, $_); | |
894 | ||
895 | # Grab the first element (and remove it) from the line array. | |
896 | # It contains the sid. | |
897 | my $sid = shift(@line); | |
898 | ||
899 | # Store the grabbed sid and the remain array as hash value. | |
900 | # It still contains the messages, references etc. | |
901 | $mappings{$sid} = [@line]; | |
902 | } | |
903 | ||
904 | # Close file handle. | |
905 | close(MAPPING); | |
906 | } | |
907 | ||
908 | # Open mappings file for writing. | |
909 | open(FILE, ">", $sid_msg_file) or die "Could not write $sid_msg_file. $!\n"; | |
910 | ||
911 | # Write notice about autogenerated file. | |
912 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n\n"; | |
913 | ||
914 | # Loop through the hash of mappings. | |
915 | foreach my $sid ( sort keys %mappings) { | |
916 | # Grab data for the sid. | |
917 | my @data = @{$mappings{$sid}}; | |
918 | ||
919 | # Add the sid to the data array. | |
920 | unshift(@data, $sid); | |
921 | ||
922 | # Generate line. | |
923 | my $line = join(" \|\| ", @data); | |
924 | ||
925 | print FILE "$line\n"; | |
926 | ||
927 | } | |
928 | ||
929 | # Close file handle. | |
930 | close(FILE); | |
931 | } | |
932 | ||
50f348f6 SS |
933 | # |
934 | ## A very tiny function to move an extracted ruleset from the temporary directory into | |
935 | ## the rules directory. | |
936 | # | |
937 | sub move_tmp_ruleset() { | |
50f348f6 SS |
938 | # Do a directory listing of the temporary directory. |
939 | opendir DH, $tmp_rules_directory; | |
940 | ||
941 | # Loop over all files. | |
942 | while(my $file = readdir DH) { | |
943 | # Move them to the rules directory. | |
944 | move "$tmp_rules_directory/$file" , "$rulespath/$file"; | |
945 | } | |
946 | ||
947 | # Close directory handle. | |
948 | closedir DH; | |
949 | } | |
950 | ||
16b2d281 SS |
951 | # |
952 | ## Function to cleanup the temporary IDS directroy. | |
953 | # | |
954 | sub cleanup_tmp_directory () { | |
16b2d281 SS |
955 | |
956 | # Delete temporary directory and all containing files. | |
957 | rmtree([ "$tmp_directory" ]); | |
958 | } | |
959 | ||
3983aebd SS |
960 | # |
961 | ## Function to do all the logging stuff if the downloading or updating of the ruleset fails. | |
962 | # | |
963 | sub log_error ($) { | |
964 | my ($error) = @_; | |
965 | ||
966 | # Remove any newline. | |
967 | chomp($error); | |
968 | ||
eb5592c1 SS |
969 | # Call private function to log the error message to syslog. |
970 | &_log_to_syslog($error); | |
971 | ||
3983aebd SS |
972 | # Call private function to write/store the error message in the storederrorfile. |
973 | &_store_error_message($error); | |
974 | } | |
975 | ||
eb5592c1 SS |
976 | # |
977 | ## Function to log a given error message to the kernel syslog. | |
978 | # | |
979 | sub _log_to_syslog ($) { | |
980 | my ($message) = @_; | |
981 | ||
eb5592c1 SS |
982 | # The syslog function works best with an array based input, |
983 | # so generate one before passing the message details to syslog. | |
984 | my @syslog = ("ERR", "<ERROR> $message"); | |
985 | ||
986 | # Establish the connection to the syslog service. | |
987 | openlog('oinkmaster', 'cons,pid', 'user'); | |
988 | ||
989 | # Send the log message. | |
990 | syslog(@syslog); | |
991 | ||
992 | # Close the log handle. | |
993 | closelog(); | |
994 | } | |
995 | ||
3983aebd SS |
996 | # |
997 | ## Private function to write a given error message to the storederror file. | |
998 | # | |
999 | sub _store_error_message ($) { | |
1000 | my ($message) = @_; | |
1001 | ||
1002 | # Remove any newline. | |
1003 | chomp($message); | |
1004 | ||
1005 | # Open file for writing. | |
1006 | open (ERRORFILE, ">$storederrorfile") or die "Could not write to $storederrorfile. $!\n"; | |
1007 | ||
1008 | # Write error to file. | |
1009 | print ERRORFILE "$message\n"; | |
1010 | ||
1011 | # Close file. | |
1012 | close (ERRORFILE); | |
3c59b1fa SS |
1013 | |
1014 | # Set correct ownership for the file. | |
1015 | &set_ownership("$storederrorfile"); | |
3983aebd SS |
1016 | } |
1017 | ||
788a71f5 SS |
1018 | # |
1019 | ## Private function to get the path and filename for a downloaded ruleset by a given provider. | |
1020 | # | |
1021 | sub _get_dl_rulesfile($) { | |
1022 | my ($provider) = @_; | |
1023 | ||
1024 | # Gather the download type for the given provider. | |
1025 | my $dl_type = $IDS::Ruleset::Providers{$provider}{'dl_type'}; | |
1026 | ||
1027 | # Obtain the file suffix for the download file type. | |
1028 | my $suffix = $dl_type_to_suffix{$dl_type}; | |
1029 | ||
1030 | # Check if a suffix has been found. | |
1031 | unless ($suffix) { | |
1032 | # Abort return - nothing. | |
1033 | return; | |
1034 | } | |
1035 | ||
1036 | # Generate the full filename and path for the stored rules file. | |
1037 | my $rulesfile = "$dl_rules_path/$dl_rulesfile_prefix-$provider$suffix"; | |
1038 | ||
1039 | # Return the generated filename. | |
1040 | return $rulesfile; | |
1041 | } | |
1042 | ||
e246285a SS |
1043 | # |
1044 | ## Private function to obtain the sid and rev of a rule. | |
1045 | # | |
1046 | ## Returns an array with the sid as first and the rev as second value. | |
1047 | # | |
1048 | sub _get_sid_and_rev ($) { | |
1049 | my ($line) = @_; | |
1050 | ||
1051 | my @ret; | |
1052 | ||
1053 | # Use regex to obtain the sid and rev. | |
1054 | if ($line =~ m/.*sid:\s*(.*?);.*rev:\s*(.*?);/) { | |
1055 | # Add the sid and rev to the array. | |
1056 | push(@ret, $1); | |
1057 | push(@ret, $2); | |
1058 | } | |
1059 | ||
1060 | # Return the array. | |
1061 | return @ret; | |
1062 | } | |
1063 | ||
61b92664 SS |
1064 | # |
1065 | ## Tiny function to delete the stored ruleset file or tarball for a given provider. | |
1066 | # | |
1067 | sub drop_dl_rulesfile ($) { | |
1068 | my ($provider) = @_; | |
1069 | ||
1070 | # Gather the full path and name of the stored rulesfile. | |
1071 | my $rulesfile = &_get_dl_rulesfile($provider); | |
1072 | ||
1073 | # Check if the given rulesfile exists. | |
1074 | if (-f $rulesfile) { | |
1075 | # Delete the stored rulesfile. | |
1076 | unlink($rulesfile) or die "Could not delete $rulesfile. $!\n"; | |
1077 | } | |
1078 | } | |
1079 | ||
69b3156f SS |
1080 | # |
1081 | ## Function to read-in the given enabled or disables sids file. | |
1082 | # | |
1083 | sub read_enabled_disabled_sids_file($) { | |
1084 | my ($file) = @_; | |
1085 | ||
1086 | # Temporary hash to store the sids and their state. It will be | |
1087 | # returned at the end of this function. | |
1088 | my %temphash; | |
1089 | ||
1090 | # Open the given filename. | |
1091 | open(FILE, "$file") or die "Could not open $file. $!\n"; | |
1092 | ||
1093 | # Loop through the file. | |
1094 | while(<FILE>) { | |
1095 | # Remove newlines. | |
1096 | chomp $_; | |
1097 | ||
1098 | # Skip blank lines. | |
1099 | next if ($_ =~ /^\s*$/); | |
1100 | ||
1101 | # Skip coments. | |
1102 | next if ($_ =~ /^\#/); | |
1103 | ||
1104 | # Splitt line into sid and state part. | |
1105 | my ($state, $sid) = split(" ", $_); | |
1106 | ||
1107 | # Skip line if the sid is not numeric. | |
1108 | next unless ($sid =~ /\d+/ ); | |
1109 | ||
1110 | # Check if the sid was enabled. | |
1111 | if ($state eq "enablesid") { | |
1112 | # Add the sid and its state as enabled to the temporary hash. | |
1113 | $temphash{$sid} = "enabled"; | |
1114 | # Check if the sid was disabled. | |
1115 | } elsif ($state eq "disablesid") { | |
1116 | # Add the sid and its state as disabled to the temporary hash. | |
1117 | $temphash{$sid} = "disabled"; | |
1118 | # Invalid state - skip the current sid and state. | |
1119 | } else { | |
1120 | next; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | # Close filehandle. | |
1125 | close(FILE); | |
1126 | ||
1127 | # Return the hash. | |
1128 | return %temphash; | |
1129 | } | |
1130 | ||
796eea21 SS |
1131 | # |
1132 | ## Function to check if the IDS is running. | |
1133 | # | |
1134 | sub ids_is_running () { | |
1135 | if(-f $idspidfile) { | |
1136 | # Open PID file for reading. | |
1137 | open(PIDFILE, "$idspidfile") or die "Could not open $idspidfile. $!\n"; | |
1138 | ||
1139 | # Grab the process-id. | |
1140 | my $pid = <PIDFILE>; | |
1141 | ||
1142 | # Close filehandle. | |
1143 | close(PIDFILE); | |
1144 | ||
1145 | # Remove any newline. | |
1146 | chomp($pid); | |
1147 | ||
1148 | # Check if a directory for the process-id exists in proc. | |
1149 | if(-d "/proc/$pid") { | |
1150 | # The IDS daemon is running return the process id. | |
1151 | return $pid; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | # Return nothing - IDS is not running. | |
1156 | return; | |
1157 | } | |
1158 | ||
5240a809 SS |
1159 | # |
1160 | ## Function to call suricatactrl binary with a given command. | |
1161 | # | |
1162 | sub call_suricatactrl ($) { | |
1163 | # Get called option. | |
ed06bc81 | 1164 | my ($option, $interval) = @_; |
5240a809 SS |
1165 | |
1166 | # Loop through the array of supported commands and check if | |
1167 | # the given one is part of it. | |
1168 | foreach my $cmd (@suricatactrl_cmds) { | |
1169 | # Skip current command unless the given one has been found. | |
1170 | next unless($cmd eq $option); | |
1171 | ||
ed06bc81 SS |
1172 | # Check if the given command is "cron". |
1173 | if ($option eq "cron") { | |
1174 | # Check if an interval has been given. | |
1175 | if ($interval) { | |
1176 | # Check if the given interval is valid. | |
1177 | foreach my $element (@cron_intervals) { | |
1178 | # Skip current element until the given one has been found. | |
1179 | next unless($element eq $interval); | |
1180 | ||
1181 | # Call the suricatactrl binary and pass the "cron" command | |
1182 | # with the requrested interval. | |
81631920 | 1183 | &General::system("$suricatactrl", "$option", "$interval"); |
ed06bc81 SS |
1184 | |
1185 | # Return "1" - True. | |
1186 | return 1; | |
1187 | } | |
1188 | } | |
5240a809 | 1189 | |
ed06bc81 SS |
1190 | # If we got here, the given interval is not supported or none has been given. - Return nothing. |
1191 | return; | |
1192 | } else { | |
1193 | # Call the suricatactrl binary and pass the requrested | |
1194 | # option to it. | |
81631920 | 1195 | &General::system("$suricatactrl", "$option"); |
ed06bc81 SS |
1196 | |
1197 | # Return "1" - True. | |
1198 | return 1; | |
1199 | } | |
5240a809 SS |
1200 | } |
1201 | ||
1202 | # Command not found - return nothing. | |
1203 | return; | |
1204 | } | |
1205 | ||
308ba5e7 SS |
1206 | # |
1207 | ## Function to create a new empty file. | |
1208 | # | |
1209 | sub create_empty_file($) { | |
1210 | my ($file) = @_; | |
1211 | ||
1212 | # Check if the given file exists. | |
1213 | if(-e $file) { | |
1214 | # Do nothing to prevent from overwriting existing files. | |
1215 | return; | |
1216 | } | |
1217 | ||
1218 | # Open the file for writing. | |
1219 | open(FILE, ">$file") or die "Could not write to $file. $!\n"; | |
1220 | ||
1221 | # Close file handle. | |
1222 | close(FILE); | |
1223 | ||
1224 | # Return true. | |
1225 | return 1; | |
1226 | } | |
1227 | ||
330759d8 SS |
1228 | # |
1229 | ## Private function to check if the file permission of the rulespath are correct. | |
1230 | ## If not, call suricatactrl to fix them. | |
1231 | # | |
1232 | sub _check_rulesdir_permissions() { | |
e568796b SS |
1233 | # Check if the rulepath main directory is writable. |
1234 | unless (-W $rulespath) { | |
1235 | # If not call suricatctrl to fix it. | |
1236 | &call_suricatactrl("fix-rules-dir"); | |
1237 | } | |
1238 | ||
330759d8 SS |
1239 | # Open snort rules directory and do a directory listing. |
1240 | opendir(DIR, $rulespath) or die $!; | |
1241 | # Loop through the direcory. | |
1242 | while (my $file = readdir(DIR)) { | |
1243 | # We only want files. | |
1244 | next unless (-f "$rulespath/$file"); | |
1245 | ||
1246 | # Check if the file is writable by the user. | |
1247 | if (-W "$rulespath/$file") { | |
1248 | # Everything is okay - go on to the next file. | |
1249 | next; | |
1250 | } else { | |
1251 | # There are wrong permissions, call suricatactrl to fix it. | |
1252 | &call_suricatactrl("fix-rules-dir"); | |
1253 | } | |
1254 | } | |
1255 | } | |
1256 | ||
b59cdbee SS |
1257 | # |
1258 | ## Private function to cleanup the directory which contains | |
1259 | ## the IDS rules, before extracting and modifing the new ruleset. | |
1260 | # | |
1261 | sub _cleanup_rulesdir() { | |
8cf04a16 SS |
1262 | # Open rules directory and do a directory listing. |
1263 | opendir(DIR, $rulespath) or die $!; | |
1264 | ||
1265 | # Loop through the direcory. | |
1266 | while (my $file = readdir(DIR)) { | |
1267 | # We only want files. | |
1268 | next unless (-f "$rulespath/$file"); | |
1269 | ||
fefb5173 SS |
1270 | # Skip rules file for whitelisted hosts. |
1271 | next if ("$rulespath/$file" eq $whitelist_file); | |
1272 | ||
612bb2df SS |
1273 | # Skip rules file with local rules. |
1274 | next if ("$rulespath/$file" eq $local_rules_file); | |
1275 | ||
8cf04a16 | 1276 | # Delete the current processed file, if not, exit this function |
b59cdbee | 1277 | # and return an error message. |
1201c1e7 | 1278 | unlink("$rulespath/$file") or return "Could not delete $rulespath/$file. $!\n"; |
b59cdbee SS |
1279 | } |
1280 | ||
4ce42488 | 1281 | # Return nothing; |
b59cdbee SS |
1282 | return; |
1283 | } | |
1284 | ||
b02e30fd SS |
1285 | # |
1286 | ## Function to generate the file which contains the home net information. | |
1287 | # | |
1288 | sub generate_home_net_file() { | |
1289 | my %netsettings; | |
1290 | ||
1291 | # Read-in network settings. | |
1292 | &General::readhash("${General::swroot}/ethernet/settings", \%netsettings); | |
1293 | ||
1294 | # Get available network zones. | |
abffcc99 | 1295 | my @network_zones = &Network::get_available_network_zones(); |
b02e30fd SS |
1296 | |
1297 | # Temporary array to store network address and prefix of the configured | |
1298 | # networks. | |
1299 | my @networks; | |
1300 | ||
1301 | # Loop through the array of available network zones. | |
1302 | foreach my $zone (@network_zones) { | |
bcbc9897 SS |
1303 | # Check if the current processed zone is red. |
1304 | if($zone eq "red") { | |
1305 | # Grab the IP-address of the red interface. | |
1306 | my $red_address = &get_red_address(); | |
b02e30fd | 1307 | |
bcbc9897 SS |
1308 | # Check if an address has been obtained. |
1309 | if ($red_address) { | |
1310 | # Generate full network string. | |
1311 | my $red_network = join("/", $red_address, "32"); | |
b02e30fd | 1312 | |
bcbc9897 SS |
1313 | # Add the red network to the array of networks. |
1314 | push(@networks, $red_network); | |
1315 | } | |
23c0347a | 1316 | |
23c0347a SS |
1317 | # Check if the configured RED_TYPE is static. |
1318 | if ($netsettings{'RED_TYPE'} eq "STATIC") { | |
1319 | # Get configured and enabled aliases. | |
1320 | my @aliases = &get_aliases(); | |
1321 | ||
1322 | # Loop through the array. | |
1323 | foreach my $alias (@aliases) { | |
1324 | # Add "/32" prefix. | |
1325 | my $network = join("/", $alias, "32"); | |
1326 | ||
1327 | # Add the generated network to the array of networks. | |
1328 | push(@networks, $network); | |
1329 | } | |
1330 | } | |
bcbc9897 SS |
1331 | # Process remaining network zones. |
1332 | } else { | |
1333 | # Convert current zone name into upper case. | |
1334 | $zone = uc($zone); | |
1335 | ||
1336 | # Generate key to access the required data from the netsettings hash. | |
1337 | my $zone_netaddress = $zone . "_NETADDRESS"; | |
1338 | my $zone_netmask = $zone . "_NETMASK"; | |
1339 | ||
1340 | # Obtain the settings from the netsettings hash. | |
1341 | my $netaddress = $netsettings{$zone_netaddress}; | |
1342 | my $netmask = $netsettings{$zone_netmask}; | |
1343 | ||
1344 | # Convert the subnetmask into prefix notation. | |
1345 | my $prefix = &Network::convert_netmask2prefix($netmask); | |
1346 | ||
1347 | # Generate full network string. | |
1348 | my $network = join("/", $netaddress,$prefix); | |
1349 | ||
1350 | # Check if the network is valid. | |
1351 | if(&Network::check_subnet($network)) { | |
1352 | # Add the generated network to the array of networks. | |
1353 | push(@networks, $network); | |
1354 | } | |
23c0347a | 1355 | } |
b02e30fd SS |
1356 | } |
1357 | ||
1358 | # Format home net declaration. | |
7479c993 | 1359 | my $line = "\"[" . join(',', @networks) . "]\""; |
b02e30fd SS |
1360 | |
1361 | # Open file to store the addresses of the home net. | |
1362 | open(FILE, ">$homenet_file") or die "Could not open $homenet_file. $!\n"; | |
1363 | ||
1364 | # Print yaml header. | |
1365 | print FILE "%YAML 1.1\n"; | |
1366 | print FILE "---\n\n"; | |
1367 | ||
1368 | # Print notice about autogenerated file. | |
1369 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n"; | |
1370 | ||
1371 | # Print the generated and required HOME_NET declaration to the file. | |
1372 | print FILE "HOME_NET:\t$line\n"; | |
1373 | ||
1374 | # Close file handle. | |
1375 | close(FILE); | |
1376 | } | |
1377 | ||
30ee98e9 SS |
1378 | # |
1379 | # Function to generate and write the file which contains the configured and used DNS servers. | |
1380 | # | |
1381 | sub generate_dns_servers_file() { | |
12c49915 SS |
1382 | # Get the used DNS servers. |
1383 | my @nameservers = &General::get_nameservers(); | |
30ee98e9 | 1384 | |
7b97359b SS |
1385 | # Get network settings. |
1386 | my %netsettings; | |
1387 | &General::readhash("${General::swroot}/ethernet/settings", \%netsettings); | |
1388 | ||
30ee98e9 | 1389 | # Format dns servers declaration. |
b76118c3 | 1390 | my $line = ""; |
30ee98e9 | 1391 | |
12c49915 SS |
1392 | # Check if the system has configured nameservers. |
1393 | if (@nameservers) { | |
7b97359b SS |
1394 | # Add the GREEN address as DNS servers. |
1395 | push(@nameservers, $netsettings{'GREEN_ADDRESS'}); | |
1396 | ||
1397 | # Check if a BLUE zone exists. | |
1398 | if ($netsettings{'BLUE_ADDRESS'}) { | |
1399 | # Add the BLUE address to the array of nameservers. | |
1400 | push(@nameservers, $netsettings{'BLUE_ADDRESS'}); | |
1401 | } | |
1402 | ||
1403 | # Generate the line which will be written to the DNS servers file. | |
b76118c3 | 1404 | $line = join(",", @nameservers); |
12c49915 | 1405 | } else { |
7b97359b | 1406 | # External net simply contains (any). |
99cadb74 | 1407 | $line = "\$EXTERNAL_NET"; |
fd2dccaa | 1408 | } |
30ee98e9 | 1409 | |
30ee98e9 SS |
1410 | # Open file to store the used DNS server addresses. |
1411 | open(FILE, ">$dns_servers_file") or die "Could not open $dns_servers_file. $!\n"; | |
1412 | ||
1413 | # Print yaml header. | |
1414 | print FILE "%YAML 1.1\n"; | |
1415 | print FILE "---\n\n"; | |
1416 | ||
1417 | # Print notice about autogenerated file. | |
1418 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n"; | |
1419 | ||
1420 | # Print the generated DNS declaration to the file. | |
b76118c3 | 1421 | print FILE "DNS_SERVERS:\t\"[$line]\"\n"; |
30ee98e9 SS |
1422 | |
1423 | # Close file handle. | |
1424 | close(FILE); | |
1425 | } | |
1426 | ||
e698090e SS |
1427 | # |
1428 | # Function to generate and write the file which contains the HTTP_PORTS definition. | |
1429 | # | |
1430 | sub generate_http_ports_file() { | |
1431 | my %proxysettings; | |
1432 | ||
1433 | # Read-in proxy settings | |
1434 | &General::readhash("${General::swroot}/proxy/advanced/settings", \%proxysettings); | |
1435 | ||
1436 | # Check if the proxy is enabled. | |
1437 | if (( -e "${General::swroot}/proxy/enable") || (-e "${General::swroot}/proxy/enable_blue")) { | |
1438 | # Add the proxy port to the array of HTTP ports. | |
1439 | push(@http_ports, $proxysettings{'PROXY_PORT'}); | |
1440 | } | |
1441 | ||
1442 | # Check if the transparent mode of the proxy is enabled. | |
1443 | if ((-e "${General::swroot}/proxy/transparent") || (-e "${General::swroot}/proxy/transparent_blue")) { | |
1444 | # Add the transparent proxy port to the array of HTTP ports. | |
1445 | push(@http_ports, $proxysettings{'TRANSPARENT_PORT'}); | |
1446 | } | |
1447 | ||
1448 | # Format HTTP_PORTS declaration. | |
1449 | my $line = ""; | |
1450 | ||
1451 | # Generate line which will be written to the http ports file. | |
1452 | $line = join(",", @http_ports); | |
1453 | ||
1454 | # Open file to store the HTTP_PORTS. | |
1455 | open(FILE, ">$http_ports_file") or die "Could not open $http_ports_file. $!\n"; | |
1456 | ||
1457 | # Print yaml header. | |
1458 | print FILE "%YAML 1.1\n"; | |
1459 | print FILE "---\n\n"; | |
1460 | ||
1461 | # Print notice about autogenerated file. | |
1462 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n"; | |
1463 | ||
1464 | # Print the generated HTTP_PORTS declaration to the file. | |
1465 | print FILE "HTTP_PORTS:\t\"[$line]\"\n"; | |
1466 | ||
1467 | # Close file handle. | |
1468 | close(FILE); | |
1469 | } | |
1470 | ||
b02e30fd | 1471 | # |
8d6714ed | 1472 | ## Function to write the file that contains the rulefiles which are loaded by suricaa. |
ddaf8ae1 | 1473 | ## |
8d6714ed | 1474 | ## This function requires an array of used provider handles. |
ddaf8ae1 | 1475 | # |
8d6714ed | 1476 | sub write_used_rulefiles_file (@) { |
ddaf8ae1 SS |
1477 | my (@providers) = @_; |
1478 | ||
8d6714ed | 1479 | # Get the enabled application layer protocols. |
43d12991 SS |
1480 | my @enabled_app_layer_protos = &get_suricata_enabled_app_layer_protos(); |
1481 | ||
8d6714ed SS |
1482 | # Open the file. |
1483 | open (FILE, ">", $suricata_used_rulesfiles_file) or die "Could not write to $suricata_used_rulesfiles_file. $!\n"; | |
88eb5626 | 1484 | |
88eb5626 SS |
1485 | print FILE "%YAML 1.1\n"; |
1486 | print FILE "---\n\n"; | |
1487 | ||
1488 | # Write notice about autogenerated file. | |
1489 | print FILE "#Autogenerated file. Any custom changes will be overwritten!\n"; | |
1490 | ||
1491 | # Loop through the array of static included rulesfiles. | |
1492 | foreach my $file (@static_included_rulefiles) { | |
1493 | # Check if the file exists. | |
1494 | if (-f "$rulespath/$file") { | |
1495 | # Write the rulesfile name to the file. | |
43d12991 SS |
1496 | print FILE " - $rulespath/$file\n"; |
1497 | } | |
1498 | } | |
1499 | ||
1500 | print FILE "\n#Default rules for used application layer protocols.\n"; | |
1501 | foreach my $enabled_app_layer_proto (@enabled_app_layer_protos) { | |
1502 | # Check if the current processed app layer proto needs to be translated | |
1503 | # into an application name. | |
1504 | if (exists($tr_app_layer_proto{$enabled_app_layer_proto})) { | |
43d12991 SS |
1505 | # Obtain the translated application name for this protocol. |
1506 | $enabled_app_layer_proto = $tr_app_layer_proto{$enabled_app_layer_proto}; | |
1507 | } | |
1508 | ||
1509 | # Generate filename. | |
1510 | my $rulesfile = "$default_rulespath/$enabled_app_layer_proto\.rules"; | |
1511 | ||
1512 | # Check if such a file exists. | |
1513 | if (-f "$rulesfile") { | |
1514 | # Write the rulesfile name to the file. | |
1515 | print FILE " - $rulesfile\n"; | |
1516 | } | |
1517 | ||
1518 | # Generate filename with "events" in filename. | |
1519 | $rulesfile = "$default_rulespath/$enabled_app_layer_proto\-events.rules"; | |
1520 | ||
1521 | # Check if this file exists. | |
1522 | if (-f "$rulesfile" ) { | |
1523 | # Write the rulesfile name to the file. | |
1524 | print FILE " - $rulesfile\n"; | |
88eb5626 SS |
1525 | } |
1526 | } | |
1527 | ||
8d6714ed SS |
1528 | # Loop through the array of enabled providers. |
1529 | foreach my $provider (@providers) { | |
1530 | # Get the used rulefile for this provider. | |
1531 | my @used_rulesfiles = &get_provider_used_rulesfiles($provider); | |
1532 | ||
1533 | # Check if there are | |
1534 | if(@used_rulesfiles) { | |
1535 | # Add notice to the file. | |
1536 | print FILE "\n#Used Rulesfiles for provider $provider.\n"; | |
1537 | ||
1538 | # Loop through the array of used rulefiles. | |
1539 | foreach my $enabled_rulesfile (@used_rulesfiles) { | |
1540 | # Generate name and full path to the rulesfile. | |
1541 | my $rulesfile = "$rulespath/$enabled_rulesfile"; | |
1542 | ||
1543 | # Write the ruelsfile name to the file. | |
1544 | print FILE " - $rulesfile\n"; | |
1545 | } | |
1546 | } | |
1547 | } | |
1548 | ||
88eb5626 SS |
1549 | # Close the file handle |
1550 | close(FILE); | |
1551 | } | |
1552 | ||
ddaf8ae1 | 1553 | # |
8d6714ed | 1554 | ## Tiny function to generate the full path and name for the file which stores the used rulefiles of a given provider. |
ddaf8ae1 | 1555 | # |
8d6714ed | 1556 | sub get_provider_used_rulesfiles_file ($) { |
ddaf8ae1 SS |
1557 | my ($provider) = @_; |
1558 | ||
8d6714ed | 1559 | my $filename = "$settingsdir/$provider\-used\-rulesfiles"; |
ddaf8ae1 SS |
1560 | |
1561 | # Return the gernerated file. | |
1562 | return $filename; | |
1563 | } | |
1564 | ||
518cbdd3 SS |
1565 | # |
1566 | ## Tiny function to generate the full path and name for the file which stores the modifications of a ruleset. | |
1567 | # | |
1568 | sub get_provider_ruleset_modifications_file($) { | |
1569 | my ($provider) = @_; | |
1570 | ||
1571 | my $filename = "$settingsdir/$provider\-modifications"; | |
1572 | ||
1573 | # Return the filename. | |
1574 | return $filename; | |
1575 | } | |
1576 | ||
235e3e92 SS |
1577 | # |
1578 | ## Function to get the subscription code of a configured provider. | |
1579 | # | |
1580 | sub get_subscription_code($) { | |
1581 | my ($provider) = @_; | |
1582 | ||
1583 | my %configured_providers = (); | |
1584 | ||
1585 | # Read-in providers settings file. | |
1586 | &General::readhasharray($providers_settings_file, \%configured_providers); | |
1587 | ||
1588 | # Loop through the hash of configured providers. | |
1589 | foreach my $id (keys %configured_providers) { | |
1590 | # Assign nice human-readable values to the data fields. | |
1591 | my $provider_handle = $configured_providers{$id}[0]; | |
1592 | my $subscription_code = $configured_providers{$id}[1]; | |
1593 | ||
1594 | # Check if the current processed provider is the requested one. | |
1595 | if ($provider_handle eq $provider) { | |
1596 | # Return the obtained subscription code. | |
1597 | return $subscription_code; | |
1598 | } | |
1599 | } | |
1600 | ||
1601 | # No subscription code found - return nothing. | |
1602 | return; | |
1603 | } | |
1604 | ||
f580aa8c SS |
1605 | # |
1606 | ## Function to get the ruleset date for a given provider. | |
1607 | ## | |
1608 | ## The function simply return the creation date in a human read-able format | |
1609 | ## of the stored providers rulesfile. | |
1610 | # | |
1611 | sub get_ruleset_date($) { | |
1612 | my ($provider) = @_; | |
fc685a36 | 1613 | my $date; |
c68bcbb2 | 1614 | my $mtime; |
f580aa8c | 1615 | |
f580aa8c SS |
1616 | # Get the stored rulesfile for this provider. |
1617 | my $stored_rulesfile = &_get_dl_rulesfile($provider); | |
1618 | ||
c68bcbb2 | 1619 | # Check if we got a file. |
cad087c7 | 1620 | if (-f $stored_rulesfile) { |
c68bcbb2 SS |
1621 | # Call stat on the rulestarball. |
1622 | my $stat = stat("$stored_rulesfile"); | |
f580aa8c | 1623 | |
c68bcbb2 SS |
1624 | # Get timestamp the file creation. |
1625 | $mtime = $stat->mtime; | |
1626 | } | |
f580aa8c | 1627 | |
057e8953 SS |
1628 | # Check if the timestamp has not been grabbed. |
1629 | unless ($mtime) { | |
1630 | # Return N/A for Not available. | |
1631 | return "N/A"; | |
1632 | } | |
1633 | ||
f580aa8c | 1634 | # Convert into human read-able format. |
fc685a36 SS |
1635 | $date = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime)); |
1636 | ||
f580aa8c SS |
1637 | # Return the date. |
1638 | return $date; | |
1639 | } | |
1640 | ||
04a0d07c SS |
1641 | # |
1642 | ## Function to gather the version of suricata. | |
1643 | # | |
1644 | sub get_suricata_version($) { | |
1645 | my ($format) = @_; | |
1646 | ||
1647 | # Execute piped suricata command and return the version information. | |
1648 | open(SURICATA, "suricata -V |") or die "Couldn't execute program: $!"; | |
1649 | ||
1650 | # Grab and store the output of the piped program. | |
1651 | my $version_string = <SURICATA>; | |
1652 | ||
1653 | # Close pipe. | |
1654 | close(SURICATA); | |
1655 | ||
1656 | # Remove newlines. | |
1657 | chomp($version_string); | |
1658 | ||
fd2dccaa | 1659 | # Grab the version from the version string. |
04a0d07c SS |
1660 | $version_string =~ /([0-9]+([.][0-9]+)+)/; |
1661 | ||
1662 | # Splitt the version into single chunks. | |
1663 | my ($major_ver, $minor_ver, $patchlevel) = split(/\./, $1); | |
1664 | ||
1665 | # Check and return the requested version sheme. | |
1666 | if ($format eq "major") { | |
1667 | # Return the full version. | |
1668 | return "$major_ver"; | |
1669 | } elsif ($format eq "minor") { | |
1670 | # Return the major and minor part. | |
1671 | return "$major_ver.$minor_ver"; | |
1672 | } else { | |
1673 | # Return the full version string. | |
1674 | return "$major_ver.$minor_ver.$patchlevel"; | |
fd2dccaa | 1675 | } |
04a0d07c SS |
1676 | } |
1677 | ||
bb39fac4 SS |
1678 | # |
1679 | ## Function to get the enabled application layer protocols. | |
1680 | # | |
1681 | sub get_suricata_enabled_app_layer_protos() { | |
1682 | # Array to store and return the enabled app layer protos. | |
1683 | my @enabled_app_layer_protos = (); | |
1684 | ||
1685 | # Execute piped suricata command and return the list of | |
1686 | # enabled application layer protocols. | |
1687 | open(SURICATA, "suricata --list-app-layer-protos |") or die "Could not execute program: $!"; | |
1688 | ||
1689 | # Grab and store the list of enabled application layer protocols. | |
1690 | my @output = <SURICATA>; | |
1691 | ||
1692 | # Close pipe. | |
1693 | close(SURICATA); | |
1694 | ||
1695 | # Merge allways enabled static application layers protocols array. | |
1696 | @enabled_app_layer_protos = @static_enabled_app_layer_protos; | |
1697 | ||
1698 | # Loop through the array which contains the output of suricata. | |
1699 | foreach my $line (@output) { | |
1700 | # Skip header line which starts with "===". | |
1701 | next if ($line =~ /^\s*=/); | |
1702 | ||
1703 | # Skip info or warning lines. | |
1704 | next if ($line =~ /\s*--/); | |
1705 | ||
1706 | # Remove newlines. | |
1707 | chomp($line); | |
1708 | ||
1709 | # Add enabled app layer proto to the array. | |
1710 | push(@enabled_app_layer_protos, $line); | |
1711 | } | |
1712 | ||
1713 | # Sort the array. | |
1714 | @enabled_app_layer_protos = sort(@enabled_app_layer_protos); | |
1715 | ||
1716 | # Return the array. | |
1717 | return @enabled_app_layer_protos; | |
1718 | } | |
1719 | ||
9283e9b9 SS |
1720 | # |
1721 | ## Function to generate the rules file with whitelisted addresses. | |
1722 | # | |
1723 | sub generate_ignore_file() { | |
1724 | my %ignored = (); | |
1725 | ||
1726 | # SID range 1000000-1999999 Reserved for Local Use | |
1727 | # Put your custom rules in this range to avoid conflicts | |
1728 | my $sid = 1500000; | |
1729 | ||
1730 | # Read-in ignoredfile. | |
1731 | &General::readhasharray($IDS::ignored_file, \%ignored); | |
1732 | ||
1733 | # Open ignorefile for writing. | |
1734 | open(FILE, ">$IDS::whitelist_file") or die "Could not write to $IDS::whitelist_file. $!\n"; | |
1735 | ||
1736 | # Config file header. | |
1737 | print FILE "# Autogenerated file.\n"; | |
1738 | print FILE "# All user modifications will be overwritten.\n\n"; | |
1739 | ||
1740 | # Add all user defined addresses to the whitelist. | |
1741 | # | |
1742 | # Check if the hash contains any elements. | |
1743 | if (keys (%ignored)) { | |
1744 | # Loop through the entire hash and write the host/network | |
1745 | # and remark to the ignore file. | |
1746 | while ( (my $key) = each %ignored) { | |
1747 | my $address = $ignored{$key}[0]; | |
1748 | my $remark = $ignored{$key}[1]; | |
1749 | my $status = $ignored{$key}[2]; | |
1750 | ||
1751 | # Check if the status of the entry is "enabled". | |
1752 | if ($status eq "enabled") { | |
1753 | # Check if the address/network is valid. | |
1754 | if ((&General::validip($address)) || (&General::validipandmask($address))) { | |
1755 | # Write rule line to the file to pass any traffic from this IP | |
c1ccae1c | 1756 | print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; bypass; sid:$sid\;)\n"; |
9283e9b9 SS |
1757 | |
1758 | # Increment sid. | |
1759 | $sid++; | |
1760 | } | |
1761 | } | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | close(FILE); | |
1766 | } | |
1767 | ||
1fedede6 SS |
1768 | # |
1769 | ## Function to set correct ownership for single files and directories. | |
1770 | # | |
1771 | ||
1772 | sub set_ownership($) { | |
1773 | my ($target) = @_; | |
1774 | ||
1775 | # User and group of the WUI. | |
1776 | my $uname = "nobody"; | |
1777 | my $grname = "nobody"; | |
1778 | ||
1779 | # The chown function implemented in perl requies the user and group as nummeric id's. | |
1780 | my $uid = getpwnam($uname); | |
1781 | my $gid = getgrnam($grname); | |
1782 | ||
1783 | # Check if the given target exists. | |
1784 | unless ($target) { | |
1785 | # Stop the script and print error message. | |
1786 | die "The $target does not exist. Cannot change the ownership!\n"; | |
1787 | } | |
1788 | ||
1789 | # Check weather the target is a file or directory. | |
1790 | if (-f $target) { | |
1791 | # Change ownership ot the single file. | |
1792 | chown($uid, $gid, "$target"); | |
1793 | } elsif (-d $target) { | |
1794 | # Do a directory listing. | |
1795 | opendir(DIR, $target) or die $!; | |
1796 | # Loop through the direcory. | |
1797 | while (my $file = readdir(DIR)) { | |
1798 | ||
1799 | # We only want files. | |
1800 | next unless (-f "$target/$file"); | |
1801 | ||
1802 | # Set correct ownership for the files. | |
1803 | chown($uid, $gid, "$target/$file"); | |
1804 | } | |
1805 | ||
1806 | closedir(DIR); | |
1807 | ||
1808 | # Change ownership of the directory. | |
1809 | chown($uid, $gid, "$target"); | |
1810 | } | |
1811 | } | |
77c31301 SS |
1812 | |
1813 | # | |
1814 | ## Function to read-in the aliases file and returns all configured and enabled aliases. | |
1815 | # | |
1816 | sub get_aliases() { | |
1817 | # Location of the aliases file. | |
1818 | my $aliases_file = "${General::swroot}/ethernet/aliases"; | |
1819 | ||
1820 | # Array to store the aliases. | |
1821 | my @aliases; | |
1822 | ||
1823 | # Check if the file is empty. | |
1824 | if (-z $aliases_file) { | |
1825 | # Abort nothing to do. | |
1826 | return; | |
1827 | } | |
1828 | ||
1829 | # Open the aliases file. | |
1830 | open(ALIASES, $aliases_file) or die "Could not open $aliases_file. $!\n"; | |
1831 | ||
1832 | # Loop through the file content. | |
1833 | while (my $line = <ALIASES>) { | |
1834 | # Remove newlines. | |
1835 | chomp($line); | |
1836 | ||
1837 | # Splitt line content into single chunks. | |
1838 | my ($address, $state, $remark) = split(/\,/, $line); | |
1839 | ||
1840 | # Check if the state of the current processed alias is "on". | |
1841 | if ($state eq "on") { | |
1842 | # Check if the address is valid. | |
1843 | if(&Network::check_ip_address($address)) { | |
1844 | # Add the alias to the array of aliases. | |
1845 | push(@aliases, $address); | |
1846 | } | |
1847 | } | |
1848 | } | |
1849 | ||
1850 | # Close file handle. | |
1851 | close(ALIASES); | |
1852 | ||
1853 | # Return the array. | |
1854 | return @aliases; | |
1855 | } | |
1856 | ||
de8e1e5b SS |
1857 | # |
1858 | ## Function to grab the current assigned IP-address on red. | |
1859 | # | |
1860 | sub get_red_address() { | |
1861 | # File, which contains the current IP-address of the red interface. | |
1862 | my $file = "${General::swroot}/red/local-ipaddress"; | |
1863 | ||
1864 | # Check if the file exists. | |
1865 | if (-e $file) { | |
1866 | # Open the given file. | |
1867 | open(FILE, "$file") or die "Could not open $file."; | |
1868 | ||
1869 | # Obtain the address from the first line of the file. | |
1870 | my $address = <FILE>; | |
1871 | ||
1872 | # Close filehandle | |
1873 | close(FILE); | |
1874 | ||
1875 | # Remove newlines. | |
1876 | chomp $address; | |
1877 | ||
1878 | # Check if the grabbed address is valid. | |
1879 | if (&General::validip($address)) { | |
1880 | # Return the address. | |
1881 | return $address; | |
1882 | } | |
1883 | } | |
1884 | ||
1885 | # Return nothing. | |
1886 | return; | |
1887 | } | |
77c31301 | 1888 | |
6563d449 | 1889 | # |
ddaf8ae1 | 1890 | ## Function to get the used rules files of a given provider. |
6563d449 | 1891 | # |
8d6714ed | 1892 | sub get_provider_used_rulesfiles($) { |
ddaf8ae1 SS |
1893 | my ($provider) = @_; |
1894 | ||
8d6714ed SS |
1895 | # Hash to store the used rulefiles of the provider. |
1896 | my %provider_rulefiles = (); | |
1897 | ||
6563d449 SS |
1898 | # Array to store the used rulefiles. |
1899 | my @used_rulesfiles = (); | |
1900 | ||
8d6714ed SS |
1901 | # Get the filename which contains the used rulefiles for this provider. |
1902 | my $used_rulesfiles_file = &get_provider_used_rulesfiles_file($provider); | |
ddaf8ae1 | 1903 | |
8d6714ed SS |
1904 | # Read-in file, if it exists. |
1905 | &General::readhash("$used_rulesfiles_file", \%provider_rulefiles) if (-f $used_rulesfiles_file); | |
6563d449 | 1906 | |
8d6714ed SS |
1907 | # Loop through the hash of rulefiles which does the provider offer. |
1908 | foreach my $rulefile (keys %provider_rulefiles) { | |
1909 | # Skip disabled rulefiles. | |
1910 | next unless($provider_rulefiles{$rulefile} eq "enabled"); | |
6563d449 | 1911 | |
8d6714ed SS |
1912 | # The General::readhash function does not allow dots as |
1913 | # key value and limits the key "string" to the part before | |
1914 | # the dot, in case it contains one. | |
1915 | # | |
1916 | # So add the file extension for the rules file manually again. | |
1917 | $rulefile = "$rulefile.rules"; | |
6563d449 | 1918 | |
8d6714ed SS |
1919 | # Add the enabled rulefile to the array of enabled rulefiles. |
1920 | push(@used_rulesfiles, $rulefile); | |
6563d449 SS |
1921 | } |
1922 | ||
1923 | # Return the array of used rulesfiles. | |
1924 | return @used_rulesfiles; | |
1925 | } | |
1926 | ||
8076deba SS |
1927 | # |
1928 | ## Function to write the lock file for locking the WUI, while | |
1929 | ## the autoupdate script runs. | |
1930 | # | |
1931 | sub lock_ids_page() { | |
1932 | # Call subfunction to create the file. | |
1933 | &create_empty_file($ids_page_lock_file); | |
1934 | } | |
1935 | ||
1936 | # | |
1937 | ## Function to release the lock of the WUI, again. | |
1938 | # | |
1939 | sub unlock_ids_page() { | |
1940 | # Delete lock file. | |
1941 | unlink($ids_page_lock_file); | |
1942 | } | |
1943 | ||
8dcebe53 | 1944 | 1; |