html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
   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 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulessettings=();
  38 my %rulesetsources = ();
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42 my %ignored=();
  43
  44 # Read-in main settings, for language, theme and colors.
  45 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  46 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  47
  48 # Get the available network zones, based on the config type of the system and store
  49 # the list of zones in an array.
  50 my @network_zones = &IDS::get_available_network_zones();
  51
  52 my $errormessage;
  53
  54 # Create files if they does not exist yet.
  55 &IDS::check_and_create_filelayout();
  56
  57 # Hash which contains the colour code of a network zone.
  58 my %colourhash = (
  59         'red' => $Header::colourred,
  60         'green' => $Header::colourgreen,
  61         'blue' => $Header::colourblue,
  62         'orange' => $Header::colourorange
  63 );
  64
  65 &Header::showhttpheaders();
  66
  67 #Get GUI values
  68 &Header::getcgihash(\%cgiparams);
  69
  70 ## Add/edit an entry to the ignore file.
  71 #
  72 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  73
  74         # Check if any input has been performed.
  75         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  76
  77                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  78                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  79                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  80                 }
  81         } else {
  82                 $errormessage = "$Lang::tr{'guardian empty input'}";
  83         }
  84
  85         # Go further if there was no error.
  86         if ($errormessage eq '') {
  87                 my %ignored = ();
  88                 my $id;
  89                 my $status;
  90
  91                 # Assign hash values.
  92                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
  93                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
  94
  95                 # Read-in ignoredfile.
  96                 &General::readhasharray($IDS::ignored_file, \%ignored);
  97
  98                 # Check if we should edit an existing entry and got an ID.
  99                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 100                         # Assin the provided id.
 101                         $id = $cgiparams{'ID'};
 102
 103                         # Undef the given ID.
 104                         undef($cgiparams{'ID'});
 105
 106                         # Grab the configured status of the corresponding entry.
 107                         $status = $ignored{$id}[2];
 108                 } else {
 109                         # Each newly added entry automatically should be enabled.
 110                         $status = "enabled";
 111
 112                         # Generate the ID for the new entry.
 113                         #
 114                         # Sort the keys by their ID and store them in an array.
 115                         my @keys = sort { $a <=> $b } keys %ignored;
 116
 117                         # Reverse the key array.
 118                         my @reversed = reverse(@keys);
 119
 120                         # Obtain the last used id.
 121                         my $last_id = @reversed[0];
 122
 123                         # Increase the last id by one and use it as id for the new entry.
 124                         $id = ++$last_id;
 125                 }
 126
 127                 # Add/Modify the entry to/in the ignored hash.
 128                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 129
 130                 # Write the changed ignored hash to the ignored file.
 131                 &General::writehasharray($IDS::ignored_file, \%ignored);
 132
 133                 # Regenerate the ignore file.
 134                 &IDS::generate_ignore_file();
 135         }
 136
 137         # Check if the IDS is running.
 138         if(&IDS::ids_is_running()) {
 139                 # Call suricatactrl to perform a reload.
 140                 &IDS::call_suricatactrl("reload");
 141         }
 142
 143 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 144 #
 145
 146 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 147         my %ignored = ();
 148
 149         # Only go further, if an ID has been passed.
 150         if ($cgiparams{'ID'}) {
 151                 # Assign the given ID.
 152                 my $id = $cgiparams{'ID'};
 153
 154                 # Undef the given ID.
 155                 undef($cgiparams{'ID'});
 156
 157                 # Read-in ignoredfile.
 158                 &General::readhasharray($IDS::ignored_file, \%ignored);
 159
 160                 # Grab the configured status of the corresponding entry.
 161                 my $status = $ignored{$id}[2];
 162
 163                 # Switch the status.
 164                 if ($status eq "disabled") {
 165                         $status = "enabled";
 166                 } else {
 167                         $status = "disabled";
 168                 }
 169
 170                 # Modify the status of the existing entry.
 171                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 172
 173                 # Write the changed ignored hash to the ignored file.
 174                 &General::writehasharray($IDS::ignored_file, \%ignored);
 175
 176                 # Regenerate the ignore file.
 177                 &IDS::generate_ignore_file();
 178
 179                 # Check if the IDS is running.
 180                 if(&IDS::ids_is_running()) {
 181                         # Call suricatactrl to perform a reload.
 182                         &IDS::call_suricatactrl("reload");
 183                 }
 184         }
 185
 186 ## Remove entry from ignore list.
 187 #
 188 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 189         my %ignored = ();
 190
 191         # Read-in ignoredfile.
 192         &General::readhasharray($IDS::ignored_file, \%ignored);
 193
 194         # Drop entry from the hash.
 195         delete($ignored{$cgiparams{'ID'}});
 196
 197         # Undef the given ID.
 198         undef($cgiparams{'ID'});
 199
 200         # Write the changed ignored hash to the ignored file.
 201         &General::writehasharray($IDS::ignored_file, \%ignored);
 202
 203         # Regenerate the ignore file.
 204         &IDS::generate_ignore_file();
 205
 206         # Check if the IDS is running.
 207         if(&IDS::ids_is_running()) {
 208                 # Call suricatactrl to perform a reload.
 209                 &IDS::call_suricatactrl("reload");
 210         }
 211 }
 212
 213 # Check if any error has been stored.
 214 if (-e $IDS::storederrorfile) {
 215         # Open file to read in the stored error message.
 216         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 217
 218         # Read the stored error message.
 219         $errormessage = <FILE>;
 220
 221         # Close file.
 222         close (FILE);
 223
 224         # Delete the file, which is now not longer required.
 225         unlink($IDS::storederrorfile);
 226 }
 227
 228 ## Grab all available snort rules and store them in the idsrules hash.
 229 #
 230 # Open snort rules directory and do a directory listing.
 231 opendir(DIR, $IDS::rulespath) or die $!;
 232         # Loop through the direcory.
 233         while (my $file = readdir(DIR)) {
 234
 235                 # We only want files.
 236                 next unless (-f "$IDS::rulespath/$file");
 237
 238                 # Ignore empty files.
 239                 next if (-z "$IDS::rulespath/$file");
 240
 241                 # Use a regular expression to find files ending in .rules
 242                 next unless ($file =~ m/\.rules$/);
 243
 244                 # Ignore files which are not read-able.
 245                 next unless (-R "$IDS::rulespath/$file");
 246
 247                 # Skip whitelist rules file.
 248                 next if( $file eq "whitelist.rules");
 249
 250                 # Call subfunction to read-in rulefile and add rules to
 251                 # the idsrules hash.
 252                 &readrulesfile("$file");
 253         }
 254
 255 closedir(DIR);
 256
 257 # Gather used rulefiles.
 258 #
 259 # Check if the file for activated rulefiles is not empty.
 260 if(-f $IDS::used_rulefiles_file) {
 261         # Open the file for used rulefile and read-in content.
 262         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 263
 264         # Read-in content.
 265         my @lines = <FILE>;
 266
 267         # Close file.
 268         close(FILE);
 269
 270         # Loop through the array.
 271         foreach my $line (@lines) {
 272                 # Remove newlines.
 273                 chomp($line);
 274
 275                 # Skip comments.
 276                 next if ($line =~ /\#/);
 277
 278                 # Skip blank  lines.
 279                 next if ($line =~ /^\s*$/);
 280
 281                 # Gather rule sid and message from the ruleline.
 282                 if ($line =~ /.*- (.*)/) {
 283                         my $rulefile = $1;
 284
 285                         # Check if the current rulefile exists in the %idsrules hash.
 286                         # If not, the file probably does not exist anymore or contains
 287                         # no rules.
 288                         if($idsrules{$rulefile}) {
 289                                 # Add the rulefile state to the %idsrules hash.
 290                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 291                         }
 292                 }
 293         }
 294 }
 295
 296 # Save ruleset configuration.
 297 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 298         my %oldsettings;
 299
 300         # Read-in current (old) IDS settings.
 301         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 302
 303         # Prevent form name from been stored in conf file.
 304         delete $cgiparams{'RULESET'};
 305
 306         # Check if an oinkcode has been provided.
 307         if ($cgiparams{'OINKCODE'}) {
 308                 # Check if the oinkcode contains unallowed chars.
 309                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 310                         $errormessage = $Lang::tr{'invalid input for oink code'};
 311                 }
 312         }
 313
 314         # Go on if there are no error messages.
 315         if (!$errormessage) {
 316                 # Store settings into settings file.
 317                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 318         }
 319
 320         # Check if the the automatic rule update hass been touched.
 321         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 322                 # Call suricatactrl to set the new interval.
 323                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 324         }
 325
 326         # Check if a ruleset is present - if not download it.
 327         unless (%idsrules) {
 328                 # Check if the red device is active.
 329                 unless (-e "${General::swroot}/red/active") {
 330                         $errormessage = $Lang::tr{'could not download latest updates'};
 331                 }
 332
 333                 # Check if enought free disk space is availabe.
 334                 if(&IDS::checkdiskspace()) {
 335                         $errormessage = "$Lang::tr{'not enough disk space'}";
 336                 }
 337
 338                 # Check if any errors happend.
 339                 unless ($errormessage) {
 340                         # Lock the webpage and print notice about downloading
 341                         # a new ruleset.
 342                         &working_notice("$Lang::tr{'snort working'}");
 343
 344                         # Call subfunction to download the ruleset.
 345                         if(&IDS::downloadruleset()) {
 346                                 $errormessage = $Lang::tr{'could not download latest updates'};
 347
 348                                 # Call function to store the errormessage.
 349                                 &IDS::_store_error_message($errormessage);
 350                         } else {
 351                                 # Call subfunction to launch oinkmaster.
 352                                 &IDS::oinkmaster();
 353                         }
 354
 355                         # Perform a reload of the page.
 356                         &reload();
 357                 }
 358         }
 359
 360 # Save ruleset.
 361 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 362         # Arrays to store which rulefiles have been enabled and will be used.
 363         my @enabled_rulefiles;
 364
 365         # Hash to store the user-enabled and disabled sids.
 366         my %enabled_disabled_sids;
 367
 368         # Loop through the hash of idsrules.
 369         foreach my $rulefile(keys %idsrules) {
 370                 # Check if the rulefile is enabled.
 371                 if ($cgiparams{$rulefile} eq "on") {
 372                         # Add rulefile to the array of enabled rulefiles.
 373                         push(@enabled_rulefiles, $rulefile);
 374
 375                         # Drop item from cgiparams hash.
 376                         delete $cgiparams{$rulefile};
 377                 }
 378         }
 379
 380         # Read-in the files for enabled/disabled sids.
 381         # This will be done by calling the read_enabled_disabled_sids_file function two times
 382         # and merge the returned hashes together into the enabled_disabled_sids hash.
 383         %enabled_disabled_sids = (
 384                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 385                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 386
 387         # Loop through the hash of idsrules.
 388         foreach my $rulefile (keys %idsrules) {
 389                 # Loop through the single rules of the rulefile.
 390                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 391                         # Skip the current sid if it is not numeric.
 392                         next unless ($sid =~ /\d+/ );
 393
 394                         # Check if there exists a key in the cgiparams hash for this sid.
 395                         if (exists($cgiparams{$sid})) {
 396                                 # Look if the rule is disabled.
 397                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 398                                         # Check if the state has been set to 'on'.
 399                                         if ($cgiparams{$sid} eq "on") {
 400                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 401                                                 $enabled_disabled_sids{$sid} = "enabled";
 402
 403                                                 # Drop item from cgiparams hash.
 404                                                 delete $cgiparams{$rulefile}{$sid};
 405                                         }
 406                                 }
 407                         } else {
 408                                 # Look if the rule is enabled.
 409                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 410                                         # Check if the state is 'on' and should be disabled.
 411                                         # In this case there is no entry
 412                                         # for the sid in the cgiparams hash.
 413                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 414                                         $enabled_disabled_sids{$sid} = "disabled";
 415
 416                                         # Drop item from cgiparams hash.
 417                                         delete $cgiparams{$rulefile}{$sid};
 418                                 }
 419                         }
 420                 }
 421         }
 422
 423         # Open enabled sid's file for writing.
 424         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 425
 426         # Open disabled sid's file for writing.
 427         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 428
 429         # Write header to the files.
 430         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 431         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 432
 433         # Check if the hash for enabled/disabled files contains any entries.
 434         if (%enabled_disabled_sids) {
 435                 # Loop through the hash.
 436                 foreach my $sid (keys %enabled_disabled_sids) {
 437                         # Check if the sid is enabled.
 438                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 439                                 # Print the sid to the enabled_sids file.
 440                                 print ENABLED_FILE "enablesid $sid\n";
 441                         # Check if the sid is disabled.
 442                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 443                                 # Print the sid to the disabled_sids file.
 444                                 print DISABLED_FILE "disablesid $sid\n";
 445                         # Something strange happende - skip the current sid.
 446                         } else {
 447                                 next;
 448                         }
 449                 }
 450         }
 451
 452         # Close file for enabled_sids after writing.
 453         close(ENABLED_FILE);
 454
 455         # Close file for disabled_sids after writing.
 456         close(DISABLED_FILE);
 457
 458         # Call function to generate and write the used rulefiles file.
 459         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 460
 461         # Lock the webpage and print message.
 462         &working_notice("$Lang::tr{'snort working'}");
 463
 464         # Call oinkmaster to alter the ruleset.
 465         &IDS::oinkmaster();
 466
 467         # Check if the IDS is running.
 468         if(&IDS::ids_is_running()) {
 469                 # Call suricatactrl to perform a reload.
 470                 &IDS::call_suricatactrl("reload");
 471         }
 472
 473         # Reload page.
 474         &reload();
 475
 476 # Download new ruleset.
 477 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 478         # Check if the red device is active.
 479         unless (-e "${General::swroot}/red/active") {
 480                 $errormessage = $Lang::tr{'could not download latest updates'};
 481         }
 482
 483         # Check if enought free disk space is availabe.
 484         if(&IDS::checkdiskspace()) {
 485                 $errormessage = "$Lang::tr{'not enough disk space'}";
 486         }
 487
 488         # Check if any errors happend.
 489         unless ($errormessage) {
 490                 # Lock the webpage and print notice about downloading
 491                 # a new ruleset.
 492                 &working_notice("$Lang::tr{'snort working'}");
 493
 494                 # Call subfunction to download the ruleset.
 495                 if(&IDS::downloadruleset()) {
 496                         $errormessage = $Lang::tr{'could not download latest updates'};
 497
 498                         # Call function to store the errormessage.
 499                         &IDS::_store_error_message($errormessage);
 500
 501                         # Preform a reload of the page.
 502                         &reload();
 503                 } else {
 504                         # Call subfunction to launch oinkmaster.
 505                         &IDS::oinkmaster();
 506
 507                         # Check if the IDS is running.
 508                         if(&IDS::ids_is_running()) {
 509                                 # Call suricatactrl to perform a reload.
 510                                 &IDS::call_suricatactrl("reload");
 511                         }
 512
 513                         # Perform a reload of the page.
 514                         &reload();
 515                 }
 516         }
 517 # Save snort settings.
 518 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 519         my %oldidssettings;
 520         my $reload_page;
 521         my $monitored_zones = 0;
 522
 523         # Read-in current (old) IDS settings.
 524         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 525
 526         # Prevent form name from been stored in conf file.
 527         delete $cgiparams{'IDS'};
 528
 529         # Check if the IDS should be enabled.
 530         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 531                 # Check if any ruleset is available. Otherwise abort and display an error.
 532                 unless(%idsrules) {
 533                         $errormessage = $Lang::tr{'ids no ruleset available'};
 534                 }
 535
 536                 # Loop through the array of available interfaces.
 537                 foreach my $zone (@network_zones) {
 538                         # Convert interface name into upper case.
 539                         my $zone_upper = uc($zone);
 540
 541                         # Check if the IDS is enabled for this interaces.
 542                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 543                                 # Increase count.
 544                                 $monitored_zones++;
 545                         }
 546                 }
 547
 548                 # Check if at least one zone should be monitored, or show an error.
 549                 unless ($monitored_zones >= 1) {
 550                         $errormessage = $Lang::tr{'ids no network zone'};
 551                 }
 552         }
 553
 554         # Go on if there are no error messages.
 555         if (!$errormessage) {
 556                 # Store settings into settings file.
 557                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 558         }
 559
 560         # Generate file to store the home net.
 561         &IDS::generate_home_net_file();
 562
 563         # Temporary variable to set the ruleaction.
 564         # Default is "drop" to use suricata as IPS.
 565         my $ruleaction="drop";
 566
 567         # Check if the traffic only should be monitored.
 568         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 569                 # Switch the ruleaction to "alert".
 570                 # Suricata acts as an IDS only.
 571                 $ruleaction="alert";
 572         }
 573
 574         # Write the modify sid's file and pass the taken ruleaction.
 575         &IDS::write_modify_sids_file($ruleaction);
 576
 577         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 578         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 579                 # Check if a ruleset exists.
 580                 if (%idsrules) {
 581                         # Lock the webpage and print message.
 582                         &working_notice("$Lang::tr{'snort working'}");
 583
 584                         # Call oinkmaster to alter the ruleset.
 585                         &IDS::oinkmaster();
 586
 587                         # Set reload_page to "True".
 588                         $reload_page="True";
 589                 }
 590         }
 591
 592         # Check if the IDS currently is running.
 593         if(&IDS::ids_is_running()) {
 594                 # Check if ENABLE_IDS is set to on.
 595                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 596                         # Call suricatactrl to perform a reload of suricata.
 597                         &IDS::call_suricatactrl("reload");
 598                 } else {
 599                         # Call suricatactrl to stop suricata.
 600                         &IDS::call_suricatactrl("stop");
 601                 }
 602         } else {
 603                 # Call suricatactrl to start suricata.
 604                 &IDS::call_suricatactrl("start");
 605         }
 606
 607         # Check if the page should be reloaded.
 608         if ($reload_page) {
 609                 # Perform a reload of the page.
 610                 &reload();
 611         }
 612 }
 613
 614 # Read-in idssettings and rulesetsettings
 615 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 616 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 617
 618 # If no autoupdate intervall has been configured yet, set default value.
 619 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 620         # Set default to "weekly".
 621         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 622 }
 623
 624 # Read-in ignored hosts.
 625 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 626
 627 $checked{'ENABLE_IDS'}{'off'} = '';
 628 $checked{'ENABLE_IDS'}{'on'} = '';
 629 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 630 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 631 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 632 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 633 $selected{'RULES'}{'nothing'} = '';
 634 $selected{'RULES'}{'community'} = '';
 635 $selected{'RULES'}{'emerging'} = '';
 636 $selected{'RULES'}{'registered'} = '';
 637 $selected{'RULES'}{'subscripted'} = '';
 638 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 639 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 640 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 641 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 642 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 643
 644 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 645
 646 ### Java Script ###
 647 print <<END
 648 <script>
 649         // JQuery function to show/hide the text input field for
 650         // Oinkcode/Subscription code.
 651         \$(function() {
 652                 \$('#RULES').change(function(){
 653                         if(\$('#RULES').val() == 'registered') {
 654                                 \$('#code').show();
 655                         } else if(\$('#RULES').val() == 'subscripted') {
 656                                 \$('#code').show();
 657                         } else if(\$('#RULES').val() == 'emerging_pro') {
 658                                 \$('#code').show();
 659                         } else {
 660                                 \$('#code').hide();
 661                         }
 662                 });
 663         });
 664
 665         // Tiny java script function to show/hide the rules
 666         // of a given category.
 667         function showhide(tblname) {
 668                 \$("#" + tblname).toggle();
 669         }
 670 </script>
 671 END
 672 ;
 673
 674 &Header::openbigbox('100%', 'left', '', $errormessage);
 675
 676 if ($errormessage) {
 677         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 678         print "<class name='base'>$errormessage\n";
 679         print "&nbsp;</class>\n";
 680         &Header::closebox();
 681 }
 682
 683 # Draw current state of the IDS
 684 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 685
 686 # Check if the IDS is running and obtain the process-id.
 687 my $pid = &IDS::ids_is_running();
 688
 689 # Display some useful information, if suricata daemon is running.
 690 if ($pid) {
 691         # Gather used memory.
 692         my $memory = &get_memory_usage($pid);
 693
 694         print <<END;
 695                 <table width='95%' cellspacing='0' class='tbl'>
 696                         <tr>
 697                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 698                         </tr>
 699
 700                         <tr>
 701                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 702                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 703                         </tr>
 704
 705                         <tr>
 706                                 <td class='base'></td>
 707                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 708                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 709                         </tr>
 710
 711                         <tr>
 712                                 <td class='base'></td>
 713                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 714                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 715                         </tr>
 716                 </table>
 717 END
 718 } else {
 719         # Otherwise display a hint that the service is not launched.
 720         print <<END;
 721                 <table width='95%' cellspacing='0' class='tbl'>
 722                         <tr>
 723                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 724                         </tr>
 725
 726                         <tr>
 727                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 728                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 729                         </tr>
 730                 </table>
 731 END
 732 }
 733
 734 my $rulesdate;
 735
 736 # Check if a ruleset allready has been downloaded.
 737 if ( -f "$IDS::rulestarball"){
 738         # Call stat on the filename to obtain detailed information.
 739         my @Info = stat("$IDS::rulestarball");
 740
 741         # Grab details about the creation time.
 742         $rulesdate = localtime($Info[9]);
 743 }
 744
 745 print <<END
 746
 747 <br><br><h2>$Lang::tr{'settings'}</h2>
 748
 749 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 750         <table width='100%' border='0'>
 751                 <tr>
 752                         <td class='base' colspan='2'>
 753                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 754                         </td>
 755
 756                         <td class='base' colspan='2'>
 757                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>$Lang::tr{'ids monitor traffic only'}
 758                         </td>
 759                 </tr>
 760
 761                 <tr>
 762                         <td><br><br></td>
 763                         <td><br><br></td>
 764                         <td><br><br></td>
 765                         <td><br><br></td>
 766                 </tr>
 767
 768                 <tr>
 769                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 770                 </tr>
 771
 772                 <tr>
 773 END
 774 ;
 775
 776 # Loop through the array of available networks and print config options.
 777 foreach my $zone (@network_zones) {
 778         my $checked_input;
 779         my $checked_forward;
 780
 781         # Convert current zone name to upper case.
 782         my $zone_upper = uc($zone);
 783
 784         # Set zone name.
 785         my $zone_name = $zone;
 786
 787         # Dirty hack to get the correct language string for the red zone.
 788         if ($zone eq "red") {
 789                 $zone_name = "red1";
 790         }
 791
 792         # Grab checkbox status from settings hash.
 793         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 794                 $checked_input = "checked = 'checked'";
 795         }
 796
 797         print "<td class='base' width='25%'>\n";
 798         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 799         print "&nbsp$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 800         print "</td>\n";
 801 }
 802
 803 print <<END
 804                 </tr>
 805         </table>
 806
 807         <br><br>
 808
 809         <table width='100%'>
 810                 <tr>
 811                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 812                 </tr>
 813         </table>
 814 </form>
 815 END
 816 ;
 817
 818 &Header::closebox();
 819
 820 # Draw elements for ruleset configuration.
 821 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 822
 823 print <<END
 824 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 825         <table width='100%' border='0'>
 826                 <tr>
 827                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 828                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 829                 </tr>
 830
 831                 <tr>
 832                         <td><select name='RULES' id='RULES'>
 833                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 834                                 <option value='emerging_pro' $selected{'RULES'}{'emerging_pro'} >$Lang::tr{'emerging pro rules'}</option>
 835                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 836                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 837                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 838                         </select>
 839                         </td>
 840
 841                         <td>
 842                                 <select name='AUTOUPDATE_INTERVAL'>
 843                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >$Lang::tr{'no'}</option>
 844                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'urlfilter daily'}</option>
 845                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'urlfilter weekly'}</option>
 846                                 </select>
 847                         </td>
 848                 </tr>
 849
 850                 <tr>
 851                         <td colspan='2'><br><br></td>
 852                 </tr>
 853
 854                 <tr style='display:none' id='code'>
 855                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 856                 </tr>
 857
 858                 <tr>
 859                         <td>&nbsp;</td>
 860
 861                         <td align='right'>
 862 END
 863 ;
 864                         # Check if a ruleset has been downloaded yet.
 865                         if (%idsrules) {
 866                                 # Display button to update the ruleset.
 867                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 868                 }
 869 print <<END;
 870                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 871                         </td>
 872
 873                 </tr>
 874         </table>
 875 </form>
 876 END
 877 ;
 878
 879 &Header::closebox();
 880
 881 #
 882 # Whitelist / Ignorelist
 883 #
 884 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 885
 886 print <<END;
 887         <table width='100%'>
 888                 <tr>
 889                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 890                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 891                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 892                 </tr>
 893 END
 894                 # Check if some hosts have been added to be ignored.
 895                 if (keys (%ignored)) {
 896                         my $col = "";
 897
 898                         # Loop through all entries of the hash.
 899                         while( (my $key) = each %ignored)  {
 900                                 # Assign data array positions to some nice variable names.
 901                                 my $address = $ignored{$key}[0];
 902                                 my $remark = $ignored{$key}[1];
 903                                 my $status  = $ignored{$key}[2];
 904
 905                                 # Check if the key (id) number is even or not.
 906                                 if ($cgiparams{'ID'} eq $key) {
 907                                         $col="bgcolor='${Header::colouryellow}'";
 908                                 } elsif ($key % 2) {
 909                                         $col="bgcolor='$color{'color22'}'";
 910                                 } else {
 911                                         $col="bgcolor='$color{'color20'}'";
 912                                 }
 913
 914                                 # Choose icon for the checkbox.
 915                                 my $gif;
 916                                 my $gdesc;
 917
 918                                 # Check if the status is enabled and select the correct image and description.
 919                                 if ($status eq 'enabled' ) {
 920                                         $gif = 'on.gif';
 921                                         $gdesc = $Lang::tr{'click to disable'};
 922                                 } else {
 923                                         $gif = 'off.gif';
 924                                         $gdesc = $Lang::tr{'click to enable'};
 925                                 }
 926
 927 print <<END;
 928                                 <tr>
 929                                         <td width='20%' class='base' $col>$address</td>
 930                                         <td width='65%' class='base' $col>$remark</td>
 931
 932                                         <td align='center' $col>
 933                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 934                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 935                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 936                                                         <input type='hidden' name='ID' value='$key' />
 937                                                 </form>
 938                                         </td>
 939
 940                                         <td align='center' $col>
 941                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 942                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 943                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 944                                                         <input type='hidden' name='ID' value='$key' />
 945                                                 </form>
 946                                         </td>
 947
 948                                         <td align='center' $col>
 949                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 950                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 951                                                         <input type='hidden' name='ID' value='$key'>
 952                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 953                                                 </form>
 954                                         </td>
 955                                 </tr>
 956 END
 957                         }
 958                 } else {
 959                         # Print notice that currently no hosts are ignored.
 960                         print "<tr>\n";
 961                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 962                         print "</tr>\n";
 963                 }
 964
 965         print "</table>\n";
 966
 967         # Section to add new elements or edit existing ones.
 968 print <<END;
 969         <br>
 970         <hr>
 971         <br>
 972
 973         <div align='center'>
 974                 <table width='100%'>
 975 END
 976
 977         # Assign correct headline and button text.
 978         my $buttontext;
 979         my $entry_address;
 980         my $entry_remark;
 981
 982         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 983         if ($cgiparams{'ID'} ne '') {
 984                 $buttontext = $Lang::tr{'update'};
 985                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 986
 987                         # Grab address and remark for the given key.
 988                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
 989                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
 990                 } else {
 991                         $buttontext = $Lang::tr{'add'};
 992                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
 993                 }
 994
 995 print <<END;
 996                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 997                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
 998                         <tr>
 999                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1000                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1001
1002                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1003                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1004                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1005                         </tr>
1006                         </form>
1007                 </table>
1008         </div>
1009 END
1010
1011 &Header::closebox();
1012
1013 # Only show the section for configuring the ruleset if one is present.
1014 if (%idsrules) {
1015         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
1016
1017                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1018
1019                 # Output display table for rule files
1020                 print "<table width='100%'>\n";
1021
1022                 # Loop over each rule file
1023                 foreach my $rulefile (sort keys(%idsrules)) {
1024                         my $rulechecked = '';
1025
1026                         # Check if rule file is enabled
1027                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1028                                 $rulechecked = 'CHECKED';
1029                         }
1030
1031                         # Convert rulefile name into category name.
1032                         my $categoryname = &_rulefile_to_category($rulefile);
1033
1034                         # Table and rows for the rule files.
1035                         print"<tr>\n";
1036                         print"<td class='base' width='5%'>\n";
1037                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1038                         print"</td>\n";
1039                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1040                         print"<td class='base' width='5%' align='right'>\n";
1041                         print"<a href=\"javascript:showhide('$categoryname')\">SHOW</a>\n";
1042                         print"</td>\n";
1043                         print"</tr>\n";
1044
1045                         # Rows which will be hidden per default and will contain the single rules.
1046                         print"<tr  style='display:none' id='$categoryname'>\n";
1047                         print"<td colspan='3'>\n";
1048
1049                         # Local vars
1050                         my $lines;
1051                         my $rows;
1052                         my $col;
1053
1054                         # New table for the single rules.
1055                         print "<table width='100%'>\n";
1056
1057                         # Loop over rule file rules
1058                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1059                                 # Local vars
1060                                 my $ruledefchecked = '';
1061
1062                                 # Skip rulefile itself.
1063                                 next if ($sid eq "Rulefile");
1064
1065                                 # If 2 rules have been displayed, start a new row
1066                                 if (($lines % 2) == 0) {
1067                                         print "</tr><tr>\n";
1068
1069                                         # Increase rows by once.
1070                                         $rows++;
1071                                 }
1072
1073                                 # Colour lines.
1074                                 if ($rows % 2) {
1075                                         $col="bgcolor='$color{'color20'}'";
1076                                 } else {
1077                                         $col="bgcolor='$color{'color22'}'";
1078                                 }
1079
1080                                 # Set rule state
1081                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1082                                         $ruledefchecked = 'CHECKED';
1083                                 }
1084
1085                                 # Create rule checkbox and display rule description
1086                                 print "<td class='base' width='5%' align='right' $col>\n";
1087                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1088                                 print "</td>\n";
1089                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1090
1091                                 # Increment rule count
1092                                 $lines++;
1093                         }
1094
1095                         # If do not have a second rule for row, create empty cell
1096                         if (($lines % 2) != 0) {
1097                                 print "<td class='base'></td>";
1098                         }
1099
1100                         # Close display table
1101                         print "</tr></table></td></tr>";
1102                 }
1103
1104                 # Close display table
1105                 print "</table>";
1106
1107 print <<END
1108 <table width='100%'>
1109 <tr>
1110         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1111                 &nbsp; <!-- space for future online help link -->
1112         </td>
1113 </tr>
1114 </table>
1115 </form>
1116 END
1117 ;
1118         &Header::closebox();
1119 }
1120
1121 &Header::closebigbox();
1122 &Header::closepage();
1123
1124 #
1125 ## A function to display a notice, to lock the webpage and
1126 ## tell the user which action currently will be performed.
1127 #
1128 sub working_notice ($) {
1129         my ($message) = @_;
1130
1131         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1132         &Header::openbigbox('100%', 'left', '', $errormessage);
1133         &Header::openbox( 'Waiting', 1,);
1134                 print <<END;
1135                         <table>
1136                                 <tr>
1137                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1138                                         <td>$message</td>
1139                                 </tr>
1140                         </table>
1141 END
1142         &Header::closebox();
1143         &Header::closebigbox();
1144         &Header::closepage();
1145 }
1146
1147 #
1148 ## A tiny function to perform a reload of the webpage after one second.
1149 #
1150 sub reload () {
1151         print "<meta http-equiv='refresh' content='1'>\n";
1152
1153         # Stop the script.
1154         exit;
1155 }
1156
1157 #
1158 ## Private function to read-in and parse rules of a given rulefile.
1159 #
1160 ## The given file will be read, parsed and all valid rules will be stored by ID,
1161 ## message/description and it's state in the idsrules hash.
1162 #
1163 sub readrulesfile ($) {
1164         my $rulefile = shift;
1165
1166         # Open rule file and read in contents
1167         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1168
1169         # Store file content in an array.
1170         my @lines = <RULEFILE>;
1171
1172         # Close file.
1173         close(RULEFILE);
1174
1175         # Loop over rule file contents
1176         foreach my $line (@lines) {
1177                 # Remove whitespaces.
1178                 chomp $line;
1179
1180                 # Skip blank  lines.
1181                 next if ($line =~ /^\s*$/);
1182
1183                 # Local vars.
1184                 my $sid;
1185                 my $msg;
1186
1187                 # Gather rule sid and message from the ruleline.
1188                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1189                         $msg = $1;
1190                         $sid = $2;
1191
1192                         # Check if a rule has been found.
1193                         if ($sid && $msg) {
1194                                 # Add rule to the idsrules hash.
1195                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1196
1197                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1198                                 if ($line =~ /^\#/) {
1199                                         # If yes, the rule is disabled.
1200                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1201                                 } else {
1202                                         # Otherwise the rule is enabled.
1203                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1204                                 }
1205                         }
1206                 }
1207         }
1208 }
1209
1210 #
1211 ## Function to get the used memory of a given process-id.
1212 #
1213 sub get_memory_usage($) {
1214         my ($pid) = @_;
1215
1216         my $memory = 0;
1217
1218         # Try to open the status file for the given process-id on the pseudo
1219         # file system proc.
1220         if (open(FILE, "/proc/$pid/status")) {
1221                 # Loop through the entire file.
1222                 while (<FILE>) {
1223                         # Splitt current line content and store them into variables.
1224                         my ($key, $value) = split(":", $_, 2);
1225
1226                         # Check if the current key is the one which contains the memory usage.
1227                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1228                         # of the entire process.
1229                         if ($key eq "VmRSS") {
1230                                 # Found the memory usage add it to the memory variable.
1231                                 $memory += $value;
1232
1233                                 # Break the loop.
1234                                 last;
1235                         }
1236                 }
1237
1238                 # Close file handle.
1239                 close(FILE);
1240
1241                 # Return memory usage.
1242                 return $memory;
1243         }
1244
1245         # If the file could not be open, return nothing.
1246         return;
1247 }
1248
1249 #
1250 ## Function to read-in the given enabled or disables sids file.
1251 #
1252 sub read_enabled_disabled_sids_file($) {
1253         my ($file) = @_;
1254
1255         # Temporary hash to store the sids and their state. It will be
1256         # returned at the end of this function.
1257         my %temphash;
1258
1259         # Open the given filename.
1260         open(FILE, "$file") or die "Could not open $file. $!\n";
1261
1262         # Loop through the file.
1263         while(<FILE>) {
1264                 # Remove newlines.
1265                 chomp $_;
1266
1267                 # Skip blank lines.
1268                 next if ($_ =~ /^\s*$/);
1269
1270                 # Skip coments.
1271                 next if ($_ =~ /^\#/);
1272
1273                 # Splitt line into sid and state part.
1274                 my ($state, $sid) = split(" ", $_);
1275
1276                 # Skip line if the sid is not numeric.
1277                 next unless ($sid =~ /\d+/ );
1278
1279                 # Check if the sid was enabled.
1280                 if ($state eq "enablesid") {
1281                         # Add the sid and its state as enabled to the temporary hash.
1282                         $temphash{$sid} = "enabled";
1283                 # Check if the sid was disabled.
1284                 } elsif ($state eq "disablesid") {
1285                         # Add the sid and its state as disabled to the temporary hash.
1286                         $temphash{$sid} = "disabled";
1287                 # Invalid state - skip the current sid and state.
1288                 } else {
1289                         next;
1290                 }
1291         }
1292
1293         # Close filehandle.
1294         close(FILE);
1295
1296         # Return the hash.
1297         return %temphash;
1298 }
1299
1300 #
1301 ## Private function to convert a given rulefile to a category name.
1302 ## ( No file extension anymore and if the name contained a dot, it
1303 ## would be replaced by a underline sign.)
1304 #
1305 sub _rulefile_to_category($) {
1306         my ($filename) = @_;
1307
1308         # Splitt the filename into single chunks and store them in a
1309         # temorary array.
1310         my @parts = split(/\./, $filename);
1311
1312         # Return / Remove last element of the temporary array.
1313         # This removes the file extension.
1314         pop @parts;
1315
1316         # Join together the single elements of the temporary array.
1317         # If these are more than one, use a "underline" for joining.
1318         my $category = join '_', @parts;
1319
1320         # Return the converted filename.
1321         return $category;
1322 }