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                 &GenerateIgnoreFile();
 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                 &GenerateIgnoreFile();
 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         &GenerateIgnoreFile();
 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
 229 ## Grab all available snort rules and store them in the idsrules hash.
 230 #
 231 # Open snort rules directory and do a directory listing.
 232 opendir(DIR, $IDS::rulespath) or die $!;
 233         # Loop through the direcory.
 234         while (my $file = readdir(DIR)) {
 235
 236                 # We only want files.
 237                 next unless (-f "$IDS::rulespath/$file");
 238
 239                 # Ignore empty files.
 240                 next if (-z "$IDS::rulespath/$file");
 241
 242                 # Use a regular expression to find files ending in .rules
 243                 next unless ($file =~ m/\.rules$/);
 244
 245                 # Ignore files which are not read-able.
 246                 next unless (-R "$IDS::rulespath/$file");
 247
 248                 # Skip whitelist rules file.
 249                 next if( $file eq "whitelist.rules");
 250
 251                 # Call subfunction to read-in rulefile and add rules to
 252                 # the idsrules hash.
 253                 &readrulesfile("$file");
 254         }
 255
 256 closedir(DIR);
 257
 258 # Gather used rulefiles.
 259 #
 260 # Check if the file for activated rulefiles is not empty.
 261 if(-f $IDS::used_rulefiles_file) {
 262         # Open the file for used rulefile and read-in content.
 263         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 264
 265         # Read-in content.
 266         my @lines = <FILE>;
 267
 268         # Close file.
 269         close(FILE);
 270
 271         # Loop through the array.
 272         foreach my $line (@lines) {
 273                 # Remove newlines.
 274                 chomp($line);
 275
 276                 # Skip comments.
 277                 next if ($line =~ /\#/);
 278
 279                 # Skip blank  lines.
 280                 next if ($line =~ /^\s*$/);
 281
 282                 # Gather rule sid and message from the ruleline.
 283                 if ($line =~ /.*- (.*)/) {
 284                         my $rulefile = $1;
 285
 286                         # Check if the current rulefile exists in the %idsrules hash.
 287                         # If not, the file probably does not exist anymore or contains
 288                         # no rules.
 289                         if($idsrules{$rulefile}) {
 290                                 # Add the rulefile state to the %idsrules hash.
 291                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 292                         }
 293                 }
 294         }
 295 }
 296
 297 # Save ruleset configuration.
 298 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 299         my %oldsettings;
 300
 301         # Read-in current (old) IDS settings.
 302         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 303
 304         # Prevent form name from been stored in conf file.
 305         delete $cgiparams{'RULESET'};
 306
 307         # Check if an oinkcode has been provided.
 308         if ($cgiparams{'OINKCODE'}) {
 309                 # Check if the oinkcode contains unallowed chars.
 310                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 311                         $errormessage = $Lang::tr{'invalid input for oink code'};
 312                 }
 313         }
 314
 315         # Go on if there are no error messages.
 316         if (!$errormessage) {
 317                 # Store settings into settings file.
 318                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 319         }
 320
 321         # Check if the the automatic rule update hass been touched.
 322         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 323                 # Call suricatactrl to set the new interval.
 324                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 325         }
 326
 327 # Save ruleset.
 328 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 329         # Arrays to store which rulefiles have been enabled and will be used.
 330         my @enabled_rulefiles;
 331
 332         # Hash to store the user-enabled and disabled sids.
 333         my %enabled_disabled_sids;
 334
 335         # Loop through the hash of idsrules.
 336         foreach my $rulefile(keys %idsrules) {
 337                 # Check if the rulefile is enabled.
 338                 if ($cgiparams{$rulefile} eq "on") {
 339                         # Add rulefile to the array of enabled rulefiles.
 340                         push(@enabled_rulefiles, $rulefile);
 341
 342                         # Drop item from cgiparams hash.
 343                         delete $cgiparams{$rulefile};
 344                 }
 345         }
 346
 347         # Read-in the files for enabled/disabled sids.
 348         # This will be done by calling the read_enabled_disabled_sids_file function two times
 349         # and merge the returned hashes together into the enabled_disabled_sids hash.
 350         %enabled_disabled_sids = (
 351                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 352                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 353
 354         # Loop through the hash of idsrules.
 355         foreach my $rulefile (keys %idsrules) {
 356                 # Loop through the single rules of the rulefile.
 357                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 358                         # Skip the current sid if it is not numeric.
 359                         next unless ($sid =~ /\d+/ );
 360
 361                         # Check if there exists a key in the cgiparams hash for this sid.
 362                         if (exists($cgiparams{$sid})) {
 363                                 # Look if the rule is disabled.
 364                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 365                                         # Check if the state has been set to 'on'.
 366                                         if ($cgiparams{$sid} eq "on") {
 367                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 368                                                 $enabled_disabled_sids{$sid} = "enabled";
 369
 370                                                 # Drop item from cgiparams hash.
 371                                                 delete $cgiparams{$rulefile}{$sid};
 372                                         }
 373                                 }
 374                         } else {
 375                                 # Look if the rule is enabled.
 376                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 377                                         # Check if the state is 'on' and should be disabled.
 378                                         # In this case there is no entry
 379                                         # for the sid in the cgiparams hash.
 380                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 381                                         $enabled_disabled_sids{$sid} = "disabled";
 382
 383                                         # Drop item from cgiparams hash.
 384                                         delete $cgiparams{$rulefile}{$sid};
 385                                 }
 386                         }
 387                 }
 388         }
 389
 390         # Open enabled sid's file for writing.
 391         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 392
 393         # Open disabled sid's file for writing.
 394         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 395
 396         # Write header to the files.
 397         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 398         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 399
 400         # Check if the hash for enabled/disabled files contains any entries.
 401         if (%enabled_disabled_sids) {
 402                 # Loop through the hash.
 403                 foreach my $sid (keys %enabled_disabled_sids) {
 404                         # Check if the sid is enabled.
 405                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 406                                 # Print the sid to the enabled_sids file.
 407                                 print ENABLED_FILE "enablesid $sid\n";
 408                         # Check if the sid is disabled.
 409                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 410                                 # Print the sid to the disabled_sids file.
 411                                 print DISABLED_FILE "disablesid $sid\n";
 412                         # Something strange happende - skip the current sid.
 413                         } else {
 414                                 next;
 415                         }
 416                 }
 417         }
 418
 419         # Close file for enabled_sids after writing.
 420         close(ENABLED_FILE);
 421
 422         # Close file for disabled_sids after writing.
 423         close(DISABLED_FILE);
 424
 425         # Call function to generate and write the used rulefiles file.
 426         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 427
 428         # Lock the webpage and print message.
 429         &working_notice("$Lang::tr{'snort working'}");
 430
 431         # Call oinkmaster to alter the ruleset.
 432         &IDS::oinkmaster();
 433
 434         # Check if the IDS is running.
 435         if(&IDS::ids_is_running()) {
 436                 # Call suricatactrl to perform a reload.
 437                 &IDS::call_suricatactrl("reload");
 438         }
 439
 440         # Reload page.
 441         &reload();
 442
 443 # Download new ruleset.
 444 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 445         # Check if the red device is active.
 446         unless (-e "${General::swroot}/red/active") {
 447                 $errormessage = $Lang::tr{'could not download latest updates'};
 448         }
 449
 450         # Check if enought free disk space is availabe.
 451         if(&IDS::checkdiskspace()) {
 452                 $errormessage = "$Lang::tr{'not enough disk space'}";
 453         }
 454
 455         # Check if any errors happend.
 456         unless ($errormessage) {
 457                 # Lock the webpage and print notice about downloading
 458                 # a new ruleset.
 459                 &working_notice("$Lang::tr{'snort working'}");
 460
 461                 # Call subfunction to download the ruleset.
 462                 if(&IDS::downloadruleset()) {
 463                         $errormessage = $Lang::tr{'could not download latest updates'};
 464
 465                         # Call function to store the errormessage.
 466                         &IDS::_store_error_message($errormessage);
 467
 468                         # Preform a reload of the page.
 469                         &reload();
 470                 } else {
 471                         # Call subfunction to launch oinkmaster.
 472                         &IDS::oinkmaster();
 473
 474                         # Check if the IDS is running.
 475                         if(&IDS::ids_is_running()) {
 476                                 # Call suricatactrl to perform a reload.
 477                                 &IDS::call_suricatactrl("reload");
 478                         }
 479
 480                         # Perform a reload of the page.
 481                         &reload();
 482                 }
 483         }
 484 # Save snort settings.
 485 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 486         my %oldidssettings;
 487         my $reload_page;
 488         my $monitored_zones = 0;
 489
 490         # Read-in current (old) IDS settings.
 491         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 492
 493         # Prevent form name from been stored in conf file.
 494         delete $cgiparams{'IDS'};
 495
 496         # Check if the IDS should be enabled.
 497         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 498                 # Check if any ruleset is available. Otherwise abort and display an error.
 499                 unless(%idsrules) {
 500                         $errormessage = $Lang::tr{'ids no ruleset available'};
 501                 }
 502
 503                 # Loop through the array of available interfaces.
 504                 foreach my $zone (@network_zones) {
 505                         # Convert interface name into upper case.
 506                         my $zone_upper = uc($zone);
 507
 508                         # Check if the IDS is enabled for this interaces.
 509                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 510                                 # Increase count.
 511                                 $monitored_zones++;
 512                         }
 513                 }
 514
 515                 # Check if at least one zone should be monitored, or show an error.
 516                 unless ($monitored_zones >= 1) {
 517                         $errormessage = $Lang::tr{'ids no network zone'};
 518                 }
 519         }
 520
 521         # Go on if there are no error messages.
 522         if (!$errormessage) {
 523                 # Store settings into settings file.
 524                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 525         }
 526
 527         # Generate file to store the home net.
 528         &IDS::generate_home_net_file();
 529
 530         # Temporary variable to set the ruleaction.
 531         # Default is "drop" to use suricata as IPS.
 532         my $ruleaction="drop";
 533
 534         # Check if the traffic only should be monitored.
 535         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 536                 # Switch the ruleaction to "alert".
 537                 # Suricata acts as an IDS only.
 538                 $ruleaction="alert";
 539         }
 540
 541         # Write the modify sid's file and pass the taken ruleaction.
 542         &IDS::write_modify_sids_file($ruleaction);
 543
 544         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 545         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 546                 # Check if a ruleset exists.
 547                 if (%idsrules) {
 548                         # Lock the webpage and print message.
 549                         &working_notice("$Lang::tr{'snort working'}");
 550
 551                         # Call oinkmaster to alter the ruleset.
 552                         &IDS::oinkmaster();
 553
 554                         # Set reload_page to "True".
 555                         $reload_page="True";
 556                 }
 557         }
 558
 559         # Check if the IDS currently is running.
 560         if(&IDS::ids_is_running()) {
 561                 # Check if ENABLE_IDS is set to on.
 562                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 563                         # Call suricatactrl to perform a reload of suricata.
 564                         &IDS::call_suricatactrl("reload");
 565                 } else {
 566                         # Call suricatactrl to stop suricata.
 567                         &IDS::call_suricatactrl("stop");
 568                 }
 569         } else {
 570                 # Call suricatactrl to start suricata.
 571                 &IDS::call_suricatactrl("start");
 572         }
 573
 574         # Check if the page should be reloaded.
 575         if ($reload_page) {
 576                 # Perform a reload of the page.
 577                 &reload();
 578         }
 579 }
 580
 581 # Read-in idssettings and rulesetsettings
 582 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 583 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 584
 585 # If no autoupdate intervall has been configured yet, set default value.
 586 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 587         # Set default to "weekly".
 588         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 589 }
 590
 591 # Read-in ignored hosts.
 592 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 593
 594 $checked{'ENABLE_IDS'}{'off'} = '';
 595 $checked{'ENABLE_IDS'}{'on'} = '';
 596 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 597 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 598 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 599 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 600 $selected{'RULES'}{'nothing'} = '';
 601 $selected{'RULES'}{'community'} = '';
 602 $selected{'RULES'}{'emerging'} = '';
 603 $selected{'RULES'}{'registered'} = '';
 604 $selected{'RULES'}{'subscripted'} = '';
 605 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 606 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 607 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 608 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 609 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 610
 611 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 612
 613 ### Java Script ###
 614 print <<END
 615 <script>
 616         // Tiny java script function to show/hide the rules
 617         // of a given category.
 618         function showhide(tblname) {
 619                 \$("#" + tblname).toggle();
 620         }
 621 </script>
 622 END
 623 ;
 624
 625 &Header::openbigbox('100%', 'left', '', $errormessage);
 626
 627 if ($errormessage) {
 628         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 629         print "<class name='base'>$errormessage\n";
 630         print "&nbsp;</class>\n";
 631         &Header::closebox();
 632 }
 633
 634 # Draw current state of the IDS
 635 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 636
 637 # Check if the IDS is running and obtain the process-id.
 638 my $pid = &IDS::ids_is_running();
 639
 640 # Display some useful information, if suricata daemon is running.
 641 if ($pid) {
 642         # Gather used memory.
 643         my $memory = &get_memory_usage($pid);
 644
 645         print <<END;
 646                 <table width='95%' cellspacing='0' class='tbl'>
 647                         <tr>
 648                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 649                         </tr>
 650
 651                         <tr>
 652                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 653                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 654                         </tr>
 655
 656                         <tr>
 657                                 <td class='base'></td>
 658                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 659                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 660                         </tr>
 661
 662                         <tr>
 663                                 <td class='base'></td>
 664                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 665                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 666                         </tr>
 667                 </table>
 668 END
 669 } else {
 670         # Otherwise display a hint that the service is not launched.
 671         print <<END;
 672                 <table width='95%' cellspacing='0' class='tbl'>
 673                         <tr>
 674                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 675                         </tr>
 676
 677                         <tr>
 678                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 679                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 680                         </tr>
 681                 </table>
 682 END
 683 }
 684 &Header::closebox();
 685
 686 my $rulesdate;
 687
 688 # Check if a ruleset allready has been downloaded.
 689 if ( -f "$IDS::rulestarball"){
 690         # Call stat on the filename to obtain detailed information.
 691         my @Info = stat("$IDS::rulestarball");
 692
 693         # Grab details about the creation time.
 694         $rulesdate = localtime($Info[9]);
 695 }
 696
 697 # Draw elements for IDS configuration.
 698 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 699
 700 print <<END
 701 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 702         <table width='100%' border='0'>
 703                 <tr>
 704                         <td class='base' colspan='2'>
 705                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 706                         </td>
 707
 708                         <td class='base' colspan='2'>
 709                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>$Lang::tr{'ids monitor traffic only'}
 710                         </td>
 711                 </tr>
 712
 713                 <tr>
 714                         <td><br><br></td>
 715                         <td><br><br></td>
 716                         <td><br><br></td>
 717                         <td><br><br></td>
 718                 </tr>
 719
 720                 <tr>
 721                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 722                 </tr>
 723
 724                 <tr>
 725 END
 726 ;
 727
 728 # Loop through the array of available networks and print config options.
 729 foreach my $zone (@network_zones) {
 730         my $checked_input;
 731         my $checked_forward;
 732
 733         # Convert current zone name to upper case.
 734         my $zone_upper = uc($zone);
 735
 736         # Set zone name.
 737         my $zone_name = $zone;
 738
 739         # Dirty hack to get the correct language string for the red zone.
 740         if ($zone eq "red") {
 741                 $zone_name = "red1";
 742         }
 743
 744         # Grab checkbox status from settings hash.
 745         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 746                 $checked_input = "checked = 'checked'";
 747         }
 748
 749         print "<td class='base' width='25%'>\n";
 750         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 751         print "&nbsp$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 752         print "</td>\n";
 753 }
 754
 755 print <<END
 756                 </tr>
 757         </table>
 758
 759         <br><br>
 760
 761         <table width='100%'>
 762                 <tr>
 763                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 764                 </tr>
 765         </table>
 766 </form>
 767 END
 768 ;
 769
 770 &Header::closebox();
 771
 772 # Draw elements for ruleset configuration.
 773 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 774
 775 print <<END
 776 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 777         <table width='100%' border='0'>
 778                 <tr>
 779                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 780                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 781                 </tr>
 782
 783                 <tr>
 784                         <td><select name='RULES'>
 785                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 786                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 787                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 788                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 789                         </select>
 790                         </td>
 791
 792                         <td>
 793                                 <select name='AUTOUPDATE_INTERVAL'>
 794                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >$Lang::tr{'no'}</option>
 795                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'urlfilter daily'}</option>
 796                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'urlfilter weekly'}</option>
 797                                 </select>
 798                         </td>
 799                 </tr>
 800
 801                 <tr>
 802                         <td colspan='2'>
 803                                 <br>$Lang::tr{'ids rules license'} <a href='https://www.snort.org/subscribe' target='_blank'>www.snort.org</a>$Lang::tr{'ids rules license1'}</br>
 804                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 805                         </td>
 806                 </tr>
 807
 808                 <tr>
 809                         <td colspan='2' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 810                 </tr>
 811
 812                 <tr>
 813                         <td>&nbsp;</td>
 814
 815                         <td align='right'>
 816 END
 817 ;
 818                 # Check if a ruleset source has been configured yet.
 819                 unless($rulessettings{'RULES'}) {
 820                         # If no ruleset settings have been saved yet, disable the button to download / update the ruleset.
 821                         print"<input type='submit' name='RULESET' disabled='disabled' value='$Lang::tr{'download new ruleset'}'>\n";
 822                 } else {
 823                         # Ruleset setting have been saved. - Check if a ruleset already is downloaded.
 824                         if (%idsrules) {
 825                                 # Allow to press the button and show it as "update ruleset".
 826                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 827                         } else {
 828                                 # Also allow to press the button, but show it as "download new ruleset".
 829                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>\n";
 830                         }
 831                 }
 832 print <<END;
 833                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 834                         </td>
 835
 836                 </tr>
 837         </table>
 838 </form>
 839 END
 840 ;
 841
 842 &Header::closebox();
 843
 844 #
 845 # Whitelist / Ignorelist
 846 #
 847 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 848
 849 print <<END;
 850         <table width='100%'>
 851                 <tr>
 852                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 853                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 854                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 855                 </tr>
 856 END
 857                 # Check if some hosts have been added to be ignored.
 858                 if (keys (%ignored)) {
 859                         my $col = "";
 860
 861                         # Loop through all entries of the hash.
 862                         while( (my $key) = each %ignored)  {
 863                                 # Assign data array positions to some nice variable names.
 864                                 my $address = $ignored{$key}[0];
 865                                 my $remark = $ignored{$key}[1];
 866                                 my $status  = $ignored{$key}[2];
 867
 868                                 # Check if the key (id) number is even or not.
 869                                 if ($cgiparams{'ID'} eq $key) {
 870                                         $col="bgcolor='${Header::colouryellow}'";
 871                                 } elsif ($key % 2) {
 872                                         $col="bgcolor='$color{'color22'}'";
 873                                 } else {
 874                                         $col="bgcolor='$color{'color20'}'";
 875                                 }
 876
 877                                 # Choose icon for the checkbox.
 878                                 my $gif;
 879                                 my $gdesc;
 880
 881                                 # Check if the status is enabled and select the correct image and description.
 882                                 if ($status eq 'enabled' ) {
 883                                         $gif = 'on.gif';
 884                                         $gdesc = $Lang::tr{'click to disable'};
 885                                 } else {
 886                                         $gif = 'off.gif';
 887                                         $gdesc = $Lang::tr{'click to enable'};
 888                                 }
 889
 890 print <<END;
 891                                 <tr>
 892                                         <td width='20%' class='base' $col>$address</td>
 893                                         <td width='65%' class='base' $col>$remark</td>
 894
 895                                         <td align='center' $col>
 896                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 897                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 898                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 899                                                         <input type='hidden' name='ID' value='$key' />
 900                                                 </form>
 901                                         </td>
 902
 903                                         <td align='center' $col>
 904                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 905                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 906                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 907                                                         <input type='hidden' name='ID' value='$key' />
 908                                                 </form>
 909                                         </td>
 910
 911                                         <td align='center' $col>
 912                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 913                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 914                                                         <input type='hidden' name='ID' value='$key'>
 915                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 916                                                 </form>
 917                                         </td>
 918                                 </tr>
 919 END
 920                         }
 921                 } else {
 922                         # Print notice that currently no hosts are ignored.
 923                         print "<tr>\n";
 924                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 925                         print "</tr>\n";
 926                 }
 927
 928         print "</table>\n";
 929
 930         # Section to add new elements or edit existing ones.
 931 print <<END;
 932         <br>
 933         <hr>
 934         <br>
 935
 936         <div align='center'>
 937                 <table width='100%'>
 938 END
 939
 940         # Assign correct headline and button text.
 941         my $buttontext;
 942         my $entry_address;
 943         my $entry_remark;
 944
 945         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 946         if ($cgiparams{'ID'} ne '') {
 947                 $buttontext = $Lang::tr{'update'};
 948                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 949
 950                         # Grab address and remark for the given key.
 951                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
 952                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
 953                 } else {
 954                         $buttontext = $Lang::tr{'add'};
 955                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
 956                 }
 957
 958 print <<END;
 959                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 960                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
 961                         <tr>
 962                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
 963                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
 964
 965                                 <td width='30%'>$Lang::tr{'remark'}: </td>
 966                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
 967                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
 968                         </tr>
 969                         </form>
 970                 </table>
 971         </div>
 972 END
 973
 974 &Header::closebox();
 975
 976 # Only show the section for configuring the ruleset if one is present.
 977 if (%idsrules) {
 978         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 979
 980                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 981
 982                 # Output display table for rule files
 983                 print "<table width='100%'>\n";
 984
 985                 # Loop over each rule file
 986                 foreach my $rulefile (sort keys(%idsrules)) {
 987                         my $rulechecked = '';
 988
 989                         # Check if rule file is enabled
 990                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 991                                 $rulechecked = 'CHECKED';
 992                         }
 993
 994                         # Convert rulefile name into category name.
 995                         my $categoryname = &_rulefile_to_category($rulefile);
 996
 997                         # Table and rows for the rule files.
 998                         print"<tr>\n";
 999                         print"<td class='base' width='5%'>\n";
1000                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1001                         print"</td>\n";
1002                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1003                         print"<td class='base' width='5%' align='right'>\n";
1004                         print"<a href=\"javascript:showhide('$categoryname')\">SHOW</a>\n";
1005                         print"</td>\n";
1006                         print"</tr>\n";
1007
1008                         # Rows which will be hidden per default and will contain the single rules.
1009                         print"<tr  style='display:none' id='$categoryname'>\n";
1010                         print"<td colspan='3'>\n";
1011
1012                         # Local vars
1013                         my $lines;
1014                         my $rows;
1015                         my $col;
1016
1017                         # New table for the single rules.
1018                         print "<table width='100%'>\n";
1019
1020                         # Loop over rule file rules
1021                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1022                                 # Local vars
1023                                 my $ruledefchecked = '';
1024
1025                                 # Skip rulefile itself.
1026                                 next if ($sid eq "Rulefile");
1027
1028                                 # If 2 rules have been displayed, start a new row
1029                                 if (($lines % 2) == 0) {
1030                                         print "</tr><tr>\n";
1031
1032                                         # Increase rows by once.
1033                                         $rows++;
1034                                 }
1035
1036                                 # Colour lines.
1037                                 if ($rows % 2) {
1038                                         $col="bgcolor='$color{'color20'}'";
1039                                 } else {
1040                                         $col="bgcolor='$color{'color22'}'";
1041                                 }
1042
1043                                 # Set rule state
1044                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1045                                         $ruledefchecked = 'CHECKED';
1046                                 }
1047
1048                                 # Create rule checkbox and display rule description
1049                                 print "<td class='base' width='5%' align='right' $col>\n";
1050                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1051                                 print "</td>\n";
1052                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1053
1054                                 # Increment rule count
1055                                 $lines++;
1056                         }
1057
1058                         # If do not have a second rule for row, create empty cell
1059                         if (($lines % 2) != 0) {
1060                                 print "<td class='base'></td>";
1061                         }
1062
1063                         # Close display table
1064                         print "</tr></table></td></tr>";
1065                 }
1066
1067                 # Close display table
1068                 print "</table>";
1069
1070 print <<END
1071 <table width='100%'>
1072 <tr>
1073         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1074                 &nbsp; <!-- space for future online help link -->
1075         </td>
1076 </tr>
1077 </table>
1078 </form>
1079 END
1080 ;
1081         &Header::closebox();
1082 }
1083
1084 &Header::closebigbox();
1085 &Header::closepage();
1086
1087 #
1088 ## A function to display a notice, to lock the webpage and
1089 ## tell the user which action currently will be performed.
1090 #
1091 sub working_notice ($) {
1092         my ($message) = @_;
1093
1094         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1095         &Header::openbigbox('100%', 'left', '', $errormessage);
1096         &Header::openbox( 'Waiting', 1,);
1097                 print <<END;
1098                         <table>
1099                                 <tr>
1100                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1101                                         <td>$message</td>
1102                                 </tr>
1103                         </table>
1104 END
1105         &Header::closebox();
1106         &Header::closebigbox();
1107         &Header::closepage();
1108 }
1109
1110 #
1111 ## A tiny function to perform a reload of the webpage after one second.
1112 #
1113 sub reload () {
1114         print "<meta http-equiv='refresh' content='1'>\n";
1115
1116         # Stop the script.
1117         exit;
1118 }
1119
1120 #
1121 ## Private function to read-in and parse rules of a given rulefile.
1122 #
1123 ## The given file will be read, parsed and all valid rules will be stored by ID,
1124 ## message/description and it's state in the idsrules hash.
1125 #
1126 sub readrulesfile ($) {
1127         my $rulefile = shift;
1128
1129         # Open rule file and read in contents
1130         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1131
1132         # Store file content in an array.
1133         my @lines = <RULEFILE>;
1134
1135         # Close file.
1136         close(RULEFILE);
1137
1138         # Loop over rule file contents
1139         foreach my $line (@lines) {
1140                 # Remove whitespaces.
1141                 chomp $line;
1142
1143                 # Skip blank  lines.
1144                 next if ($line =~ /^\s*$/);
1145
1146                 # Local vars.
1147                 my $sid;
1148                 my $msg;
1149
1150                 # Gather rule sid and message from the ruleline.
1151                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1152                         $msg = $1;
1153                         $sid = $2;
1154
1155                         # Check if a rule has been found.
1156                         if ($sid && $msg) {
1157                                 # Add rule to the idsrules hash.
1158                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1159
1160                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1161                                 if ($line =~ /^\#/) {
1162                                         # If yes, the rule is disabled.
1163                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1164                                 } else {
1165                                         # Otherwise the rule is enabled.
1166                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1167                                 }
1168                         }
1169                 }
1170         }
1171 }
1172
1173 #
1174 ## Function to get the used memory of a given process-id.
1175 #
1176 sub get_memory_usage($) {
1177         my ($pid) = @_;
1178
1179         my $memory = 0;
1180
1181         # Try to open the status file for the given process-id on the pseudo
1182         # file system proc.
1183         if (open(FILE, "/proc/$pid/status")) {
1184                 # Loop through the entire file.
1185                 while (<FILE>) {
1186                         # Splitt current line content and store them into variables.
1187                         my ($key, $value) = split(":", $_, 2);
1188
1189                         # Check if the current key is the one which contains the memory usage.
1190                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1191                         # of the entire process.
1192                         if ($key eq "VmRSS") {
1193                                 # Found the memory usage add it to the memory variable.
1194                                 $memory += $value;
1195
1196                                 # Break the loop.
1197                                 last;
1198                         }
1199                 }
1200
1201                 # Close file handle.
1202                 close(FILE);
1203
1204                 # Return memory usage.
1205                 return $memory;
1206         }
1207
1208         # If the file could not be open, return nothing.
1209         return;
1210 }
1211
1212 #
1213 ## Function to generate the rules file with whitelisted addresses.
1214 #
1215 sub GenerateIgnoreFile() {
1216         my %ignored = ();
1217
1218         # SID range 1000000-1999999 Reserved for Local Use
1219         # Put your custom rules in this range to avoid conflicts
1220         my $sid = 1500000;
1221
1222         # Read-in ignoredfile.
1223         &General::readhasharray($IDS::ignored_file, \%ignored);
1224
1225         # Open ignorefile for writing.
1226         open(FILE, ">$IDS::whitelist_file") or die "Could not write to $IDS::whitelist_file. $!\n";
1227
1228         # Config file header.
1229         print FILE "# Autogenerated file.\n";
1230         print FILE "# All user modifications will be overwritten.\n\n";
1231
1232         # Add all user defined addresses to the whitelist.
1233         #
1234         # Check if the hash contains any elements.
1235         if (keys (%ignored)) {
1236                 # Loop through the entire hash and write the host/network
1237                 # and remark to the ignore file.
1238                 while ( (my $key) = each %ignored) {
1239                         my $address = $ignored{$key}[0];
1240                         my $remark = $ignored{$key}[1];
1241                         my $status = $ignored{$key}[2];
1242
1243                         # Check if the status of the entry is "enabled".
1244                         if ($status eq "enabled") {
1245                                 # Check if the address/network is valid.
1246                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1247                                         # Write rule line to the file to pass any traffic from this IP
1248                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1249
1250                                         # Increment sid.
1251                                         $sid++;
1252                                 }
1253                         }
1254                 }
1255         }
1256
1257         close(FILE);
1258 }
1259
1260 #
1261 ## Function to read-in the given enabled or disables sids file.
1262 #
1263 sub read_enabled_disabled_sids_file($) {
1264         my ($file) = @_;
1265
1266         # Temporary hash to store the sids and their state. It will be
1267         # returned at the end of this function.
1268         my %temphash;
1269
1270         # Open the given filename.
1271         open(FILE, "$file") or die "Could not open $file. $!\n";
1272
1273         # Loop through the file.
1274         while(<FILE>) {
1275                 # Remove newlines.
1276                 chomp $_;
1277
1278                 # Skip blank lines.
1279                 next if ($_ =~ /^\s*$/);
1280
1281                 # Skip coments.
1282                 next if ($_ =~ /^\#/);
1283
1284                 # Splitt line into sid and state part.
1285                 my ($state, $sid) = split(" ", $_);
1286
1287                 # Skip line if the sid is not numeric.
1288                 next unless ($sid =~ /\d+/ );
1289
1290                 # Check if the sid was enabled.
1291                 if ($state eq "enablesid") {
1292                         # Add the sid and its state as enabled to the temporary hash.
1293                         $temphash{$sid} = "enabled";
1294                 # Check if the sid was disabled.
1295                 } elsif ($state eq "disablesid") {
1296                         # Add the sid and its state as disabled to the temporary hash.
1297                         $temphash{$sid} = "disabled";
1298                 # Invalid state - skip the current sid and state.
1299                 } else {
1300                         next;
1301                 }
1302         }
1303
1304         # Close filehandle.
1305         close(FILE);
1306
1307         # Return the hash.
1308         return %temphash;
1309 }
1310
1311 #
1312 ## Private function to convert a given rulefile to a category name.
1313 ## ( No file extension anymore and if the name contained a dot, it
1314 ## would be replaced by a underline sign.)
1315 #
1316 sub _rulefile_to_category($) {
1317         my ($filename) = @_;
1318
1319         # Splitt the filename into single chunks and store them in a
1320         # temorary array.
1321         my @parts = split(/\./, $filename);
1322
1323         # Return / Remove last element of the temporary array.
1324         # This removes the file extension.
1325         pop @parts;
1326
1327         # Join together the single elements of the temporary array.
1328         # If these are more than one, use a "underline" for joining.
1329         my $category = join '_', @parts;
1330
1331         # Return the converted filename.
1332         return $category;
1333 }