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("$IDS::ids_settings_file", \%cgiparams);
 525         }
 526
 527         # Generate file to store the home net.
 528         &IDS::generate_home_net_file();
 529
 530         # Open modify sid's file for writing.
 531         open(FILE, ">$IDS::modify_sids_file") or die "Could not write to $IDS::modify_sids_file. $!\n";
 532
 533         # Write file header.
 534         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 535
 536         # Check if the traffic only should be monitored.
 537         unless($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 538                 # Tell oinkmaster to switch all rules from alert to drop.
 539                 print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 540         }
 541
 542         # Close file handle.
 543         close(FILE);
 544
 545         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 546         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 547                 # Check if a ruleset exists.
 548                 if (%idsrules) {
 549                         # Lock the webpage and print message.
 550                         &working_notice("$Lang::tr{'snort working'}");
 551
 552                         # Call oinkmaster to alter the ruleset.
 553                         &IDS::oinkmaster();
 554
 555                         # Set reload_page to "True".
 556                         $reload_page="True";
 557                 }
 558         }
 559
 560         # Check if the IDS currently is running.
 561         if(&IDS::ids_is_running()) {
 562                 # Check if ENABLE_IDS is set to on.
 563                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 564                         # Call suricatactrl to perform a reload of suricata.
 565                         &IDS::call_suricatactrl("reload");
 566                 } else {
 567                         # Call suricatactrl to stop suricata.
 568                         &IDS::call_suricatactrl("stop");
 569                 }
 570         } else {
 571                 # Call suricatactrl to start suricata.
 572                 &IDS::call_suricatactrl("start");
 573         }
 574
 575         # Check if the page should be reloaded.
 576         if ($reload_page) {
 577                 # Perform a reload of the page.
 578                 &reload();
 579         }
 580 }
 581
 582 # Read-in idssettings and rulesetsettings
 583 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 584 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 585
 586 # If no autoupdate intervall has been configured yet, set default value.
 587 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 588         # Set default to "weekly".
 589         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 590 }
 591
 592 # Read-in ignored hosts.
 593 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 594
 595 $checked{'ENABLE_IDS'}{'off'} = '';
 596 $checked{'ENABLE_IDS'}{'on'} = '';
 597 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 598 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 599 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 600 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 601 $selected{'RULES'}{'nothing'} = '';
 602 $selected{'RULES'}{'community'} = '';
 603 $selected{'RULES'}{'emerging'} = '';
 604 $selected{'RULES'}{'registered'} = '';
 605 $selected{'RULES'}{'subscripted'} = '';
 606 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 607 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 608 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 609 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 610 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 611
 612 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 613
 614 ### Java Script ###
 615 print <<END
 616 <script>
 617         // Tiny java script function to show/hide the rules
 618         // of a given category.
 619         function showhide(tblname) {
 620                 \$("#" + tblname).toggle();
 621         }
 622 </script>
 623 END
 624 ;
 625
 626 &Header::openbigbox('100%', 'left', '', $errormessage);
 627
 628 if ($errormessage) {
 629         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 630         print "<class name='base'>$errormessage\n";
 631         print "&nbsp;</class>\n";
 632         &Header::closebox();
 633 }
 634
 635 # Draw current state of the IDS
 636 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 637
 638 # Check if the IDS is running and obtain the process-id.
 639 my $pid = &IDS::ids_is_running();
 640
 641 # Display some useful information, if suricata daemon is running.
 642 if ($pid) {
 643         # Gather used memory.
 644         my $memory = &get_memory_usage($pid);
 645
 646         print <<END;
 647                 <table width='95%' cellspacing='0' class='tbl'>
 648                         <tr>
 649                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 650                         </tr>
 651
 652                         <tr>
 653                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 654                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 655                         </tr>
 656
 657                         <tr>
 658                                 <td class='base'></td>
 659                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 660                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 661                         </tr>
 662
 663                         <tr>
 664                                 <td class='base'></td>
 665                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 666                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 667                         </tr>
 668                 </table>
 669 END
 670 } else {
 671         # Otherwise display a hint that the service is not launched.
 672         print <<END;
 673                 <table width='95%' cellspacing='0' class='tbl'>
 674                         <tr>
 675                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 676                         </tr>
 677
 678                         <tr>
 679                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 680                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 681                         </tr>
 682                 </table>
 683 END
 684 }
 685 &Header::closebox();
 686
 687 my $rulesdate;
 688
 689 # Check if a ruleset allready has been downloaded.
 690 if ( -f "$IDS::rulestarball"){
 691         # Call stat on the filename to obtain detailed information.
 692         my @Info = stat("$IDS::rulestarball");
 693
 694         # Grab details about the creation time.
 695         $rulesdate = localtime($Info[9]);
 696 }
 697
 698 # Draw elements for IDS configuration.
 699 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 700
 701 print <<END
 702 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 703         <table width='100%' border='0'>
 704                 <tr>
 705                         <td class='base' colspan='2'>
 706                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 707                         </td>
 708
 709                         <td class='base' colspan='2'>
 710                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>$Lang::tr{'ids monitor traffic only'}
 711                         </td>
 712                 </tr>
 713
 714                 <tr>
 715                         <td><br><br></td>
 716                         <td><br><br></td>
 717                         <td><br><br></td>
 718                         <td><br><br></td>
 719                 </tr>
 720
 721                 <tr>
 722                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 723                 </tr>
 724
 725                 <tr>
 726 END
 727 ;
 728
 729 # Loop through the array of available networks and print config options.
 730 foreach my $zone (@network_zones) {
 731         my $checked_input;
 732         my $checked_forward;
 733
 734         # Convert current zone name to upper case.
 735         my $zone_upper = uc($zone);
 736
 737         # Set zone name.
 738         my $zone_name = $zone;
 739
 740         # Dirty hack to get the correct language string for the red zone.
 741         if ($zone eq "red") {
 742                 $zone_name = "red1";
 743         }
 744
 745         # Grab checkbox status from settings hash.
 746         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 747                 $checked_input = "checked = 'checked'";
 748         }
 749
 750         print "<td class='base' width='25%'>\n";
 751         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 752         print "&nbsp$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 753         print "</td>\n";
 754 }
 755
 756 print <<END
 757                 </tr>
 758         </table>
 759
 760         <br><br>
 761
 762         <table width='100%'>
 763                 <tr>
 764                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 765                 </tr>
 766         </table>
 767 </form>
 768 END
 769 ;
 770
 771 &Header::closebox();
 772
 773 # Draw elements for ruleset configuration.
 774 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 775
 776 print <<END
 777 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 778         <table width='100%' border='0'>
 779                 <tr>
 780                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 781                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 782                 </tr>
 783
 784                 <tr>
 785                         <td><select name='RULES'>
 786                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 787                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 788                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 789                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 790                         </select>
 791                         </td>
 792
 793                         <td>
 794                                 <select name='AUTOUPDATE_INTERVAL'>
 795                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >$Lang::tr{'no'}</option>
 796                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'urlfilter daily'}</option>
 797                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'urlfilter weekly'}</option>
 798                                 </select>
 799                         </td>
 800                 </tr>
 801
 802                 <tr>
 803                         <td colspan='2'>
 804                                 <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>
 805                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 806                         </td>
 807                 </tr>
 808
 809                 <tr>
 810                         <td colspan='2' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 811                 </tr>
 812
 813                 <tr>
 814                         <td>&nbsp;</td>
 815
 816                         <td align='right'>
 817 END
 818 ;
 819                 # Check if a ruleset source has been configured yet.
 820                 unless($rulessettings{'RULES'}) {
 821                         # If no ruleset settings have been saved yet, disable the button to download / update the ruleset.
 822                         print"<input type='submit' name='RULESET' disabled='disabled' value='$Lang::tr{'download new ruleset'}'>\n";
 823                 } else {
 824                         # Ruleset setting have been saved. - Check if a ruleset already is downloaded.
 825                         if (%idsrules) {
 826                                 # Allow to press the button and show it as "update ruleset".
 827                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 828                         } else {
 829                                 # Also allow to press the button, but show it as "download new ruleset".
 830                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>\n";
 831                         }
 832                 }
 833 print <<END;
 834                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 835                         </td>
 836
 837                 </tr>
 838         </table>
 839 </form>
 840 END
 841 ;
 842
 843 &Header::closebox();
 844
 845 #
 846 # Whitelist / Ignorelist
 847 #
 848 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 849
 850 print <<END;
 851         <table width='100%'>
 852                 <tr>
 853                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 854                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 855                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 856                 </tr>
 857 END
 858                 # Check if some hosts have been added to be ignored.
 859                 if (keys (%ignored)) {
 860                         my $col = "";
 861
 862                         # Loop through all entries of the hash.
 863                         while( (my $key) = each %ignored)  {
 864                                 # Assign data array positions to some nice variable names.
 865                                 my $address = $ignored{$key}[0];
 866                                 my $remark = $ignored{$key}[1];
 867                                 my $status  = $ignored{$key}[2];
 868
 869                                 # Check if the key (id) number is even or not.
 870                                 if ($cgiparams{'ID'} eq $key) {
 871                                         $col="bgcolor='${Header::colouryellow}'";
 872                                 } elsif ($key % 2) {
 873                                         $col="bgcolor='$color{'color22'}'";
 874                                 } else {
 875                                         $col="bgcolor='$color{'color20'}'";
 876                                 }
 877
 878                                 # Choose icon for the checkbox.
 879                                 my $gif;
 880                                 my $gdesc;
 881
 882                                 # Check if the status is enabled and select the correct image and description.
 883                                 if ($status eq 'enabled' ) {
 884                                         $gif = 'on.gif';
 885                                         $gdesc = $Lang::tr{'click to disable'};
 886                                 } else {
 887                                         $gif = 'off.gif';
 888                                         $gdesc = $Lang::tr{'click to enable'};
 889                                 }
 890
 891 print <<END;
 892                                 <tr>
 893                                         <td width='20%' class='base' $col>$address</td>
 894                                         <td width='65%' class='base' $col>$remark</td>
 895
 896                                         <td align='center' $col>
 897                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 898                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 899                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 900                                                         <input type='hidden' name='ID' value='$key' />
 901                                                 </form>
 902                                         </td>
 903
 904                                         <td align='center' $col>
 905                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 906                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 907                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 908                                                         <input type='hidden' name='ID' value='$key' />
 909                                                 </form>
 910                                         </td>
 911
 912                                         <td align='center' $col>
 913                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 914                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 915                                                         <input type='hidden' name='ID' value='$key'>
 916                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 917                                                 </form>
 918                                         </td>
 919                                 </tr>
 920 END
 921                         }
 922                 } else {
 923                         # Print notice that currently no hosts are ignored.
 924                         print "<tr>\n";
 925                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 926                         print "</tr>\n";
 927                 }
 928
 929         print "</table>\n";
 930
 931         # Section to add new elements or edit existing ones.
 932 print <<END;
 933         <br>
 934         <hr>
 935         <br>
 936
 937         <div align='center'>
 938                 <table width='100%'>
 939 END
 940
 941         # Assign correct headline and button text.
 942         my $buttontext;
 943         my $entry_address;
 944         my $entry_remark;
 945
 946         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 947         if ($cgiparams{'ID'} ne '') {
 948                 $buttontext = $Lang::tr{'update'};
 949                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 950
 951                         # Grab address and remark for the given key.
 952                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
 953                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
 954                 } else {
 955                         $buttontext = $Lang::tr{'add'};
 956                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
 957                 }
 958
 959 print <<END;
 960                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 961                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
 962                         <tr>
 963                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
 964                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
 965
 966                                 <td width='30%'>$Lang::tr{'remark'}: </td>
 967                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
 968                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
 969                         </tr>
 970                         </form>
 971                 </table>
 972         </div>
 973 END
 974
 975 &Header::closebox();
 976
 977 # Only show the section for configuring the ruleset if one is present.
 978 if (%idsrules) {
 979         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 980
 981                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 982
 983                 # Output display table for rule files
 984                 print "<table width='100%'>\n";
 985
 986                 # Loop over each rule file
 987                 foreach my $rulefile (sort keys(%idsrules)) {
 988                         my $rulechecked = '';
 989
 990                         # Check if rule file is enabled
 991                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 992                                 $rulechecked = 'CHECKED';
 993                         }
 994
 995                         # Convert rulefile name into category name.
 996                         my $categoryname = &_rulefile_to_category($rulefile);
 997
 998                         # Table and rows for the rule files.
 999                         print"<tr>\n";
1000                         print"<td class='base' width='5%'>\n";
1001                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1002                         print"</td>\n";
1003                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1004                         print"<td class='base' width='5%' align='right'>\n";
1005                         print"<a href=\"javascript:showhide('$categoryname')\">SHOW</a>\n";
1006                         print"</td>\n";
1007                         print"</tr>\n";
1008
1009                         # Rows which will be hidden per default and will contain the single rules.
1010                         print"<tr  style='display:none' id='$categoryname'>\n";
1011                         print"<td colspan='3'>\n";
1012
1013                         # Local vars
1014                         my $lines;
1015                         my $rows;
1016                         my $col;
1017
1018                         # New table for the single rules.
1019                         print "<table width='100%'>\n";
1020
1021                         # Loop over rule file rules
1022                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1023                                 # Local vars
1024                                 my $ruledefchecked = '';
1025
1026                                 # Skip rulefile itself.
1027                                 next if ($sid eq "Rulefile");
1028
1029                                 # If 2 rules have been displayed, start a new row
1030                                 if (($lines % 2) == 0) {
1031                                         print "</tr><tr>\n";
1032
1033                                         # Increase rows by once.
1034                                         $rows++;
1035                                 }
1036
1037                                 # Colour lines.
1038                                 if ($rows % 2) {
1039                                         $col="bgcolor='$color{'color20'}'";
1040                                 } else {
1041                                         $col="bgcolor='$color{'color22'}'";
1042                                 }
1043
1044                                 # Set rule state
1045                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1046                                         $ruledefchecked = 'CHECKED';
1047                                 }
1048
1049                                 # Create rule checkbox and display rule description
1050                                 print "<td class='base' width='5%' align='right' $col>\n";
1051                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1052                                 print "</td>\n";
1053                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1054
1055                                 # Increment rule count
1056                                 $lines++;
1057                         }
1058
1059                         # If do not have a second rule for row, create empty cell
1060                         if (($lines % 2) != 0) {
1061                                 print "<td class='base'></td>";
1062                         }
1063
1064                         # Close display table
1065                         print "</tr></table></td></tr>";
1066                 }
1067
1068                 # Close display table
1069                 print "</table>";
1070
1071 print <<END
1072 <table width='100%'>
1073 <tr>
1074         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1075                 &nbsp; <!-- space for future online help link -->
1076         </td>
1077 </tr>
1078 </table>
1079 </form>
1080 END
1081 ;
1082         &Header::closebox();
1083 }
1084
1085 &Header::closebigbox();
1086 &Header::closepage();
1087
1088 #
1089 ## A function to display a notice, to lock the webpage and
1090 ## tell the user which action currently will be performed.
1091 #
1092 sub working_notice ($) {
1093         my ($message) = @_;
1094
1095         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1096         &Header::openbigbox('100%', 'left', '', $errormessage);
1097         &Header::openbox( 'Waiting', 1,);
1098                 print <<END;
1099                         <table>
1100                                 <tr>
1101                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1102                                         <td>$message</td>
1103                                 </tr>
1104                         </table>
1105 END
1106         &Header::closebox();
1107         &Header::closebigbox();
1108         &Header::closepage();
1109 }
1110
1111 #
1112 ## A tiny function to perform a reload of the webpage after one second.
1113 #
1114 sub reload () {
1115         print "<meta http-equiv='refresh' content='1'>\n";
1116
1117         # Stop the script.
1118         exit;
1119 }
1120
1121 #
1122 ## Private function to read-in and parse rules of a given rulefile.
1123 #
1124 ## The given file will be read, parsed and all valid rules will be stored by ID,
1125 ## message/description and it's state in the idsrules hash.
1126 #
1127 sub readrulesfile ($) {
1128         my $rulefile = shift;
1129
1130         # Open rule file and read in contents
1131         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1132
1133         # Store file content in an array.
1134         my @lines = <RULEFILE>;
1135
1136         # Close file.
1137         close(RULEFILE);
1138
1139         # Loop over rule file contents
1140         foreach my $line (@lines) {
1141                 # Remove whitespaces.
1142                 chomp $line;
1143
1144                 # Skip blank  lines.
1145                 next if ($line =~ /^\s*$/);
1146
1147                 # Local vars.
1148                 my $sid;
1149                 my $msg;
1150
1151                 # Gather rule sid and message from the ruleline.
1152                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1153                         $msg = $1;
1154                         $sid = $2;
1155
1156                         # Check if a rule has been found.
1157                         if ($sid && $msg) {
1158                                 # Add rule to the idsrules hash.
1159                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1160
1161                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1162                                 if ($line =~ /^\#/) {
1163                                         # If yes, the rule is disabled.
1164                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1165                                 } else {
1166                                         # Otherwise the rule is enabled.
1167                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1168                                 }
1169                         }
1170                 }
1171         }
1172 }
1173
1174 #
1175 ## Function to get the used memory of a given process-id.
1176 #
1177 sub get_memory_usage($) {
1178         my ($pid) = @_;
1179
1180         my $memory = 0;
1181
1182         # Try to open the status file for the given process-id on the pseudo
1183         # file system proc.
1184         if (open(FILE, "/proc/$pid/status")) {
1185                 # Loop through the entire file.
1186                 while (<FILE>) {
1187                         # Splitt current line content and store them into variables.
1188                         my ($key, $value) = split(":", $_, 2);
1189
1190                         # Check if the current key is the one which contains the memory usage.
1191                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1192                         # of the entire process.
1193                         if ($key eq "VmRSS") {
1194                                 # Found the memory usage add it to the memory variable.
1195                                 $memory += $value;
1196
1197                                 # Break the loop.
1198                                 last;
1199                         }
1200                 }
1201
1202                 # Close file handle.
1203                 close(FILE);
1204
1205                 # Return memory usage.
1206                 return $memory;
1207         }
1208
1209         # If the file could not be open, return nothing.
1210         return;
1211 }
1212
1213 #
1214 ## Function to generate the rules file with whitelisted addresses.
1215 #
1216 sub GenerateIgnoreFile() {
1217         my %ignored = ();
1218
1219         # SID range 1000000-1999999 Reserved for Local Use
1220         # Put your custom rules in this range to avoid conflicts
1221         my $sid = 1500000;
1222
1223         # Read-in ignoredfile.
1224         &General::readhasharray($IDS::ignored_file, \%ignored);
1225
1226         # Open ignorefile for writing.
1227         open(FILE, ">$IDS::whitelist_file") or die "Could not write to $IDS::whitelist_file. $!\n";
1228
1229         # Config file header.
1230         print FILE "# Autogenerated file.\n";
1231         print FILE "# All user modifications will be overwritten.\n\n";
1232
1233         # Add all user defined addresses to the whitelist.
1234         #
1235         # Check if the hash contains any elements.
1236         if (keys (%ignored)) {
1237                 # Loop through the entire hash and write the host/network
1238                 # and remark to the ignore file.
1239                 while ( (my $key) = each %ignored) {
1240                         my $address = $ignored{$key}[0];
1241                         my $remark = $ignored{$key}[1];
1242                         my $status = $ignored{$key}[2];
1243
1244                         # Check if the status of the entry is "enabled".
1245                         if ($status eq "enabled") {
1246                                 # Check if the address/network is valid.
1247                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1248                                         # Write rule line to the file to pass any traffic from this IP
1249                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1250
1251                                         # Increment sid.
1252                                         $sid++;
1253                                 }
1254                         }
1255                 }
1256         }
1257
1258         close(FILE);
1259 }
1260
1261 #
1262 ## Function to read-in the given enabled or disables sids file.
1263 #
1264 sub read_enabled_disabled_sids_file($) {
1265         my ($file) = @_;
1266
1267         # Temporary hash to store the sids and their state. It will be
1268         # returned at the end of this function.
1269         my %temphash;
1270
1271         # Open the given filename.
1272         open(FILE, "$file") or die "Could not open $file. $!\n";
1273
1274         # Loop through the file.
1275         while(<FILE>) {
1276                 # Remove newlines.
1277                 chomp $_;
1278
1279                 # Skip blank lines.
1280                 next if ($_ =~ /^\s*$/);
1281
1282                 # Skip coments.
1283                 next if ($_ =~ /^\#/);
1284
1285                 # Splitt line into sid and state part.
1286                 my ($state, $sid) = split(" ", $_);
1287
1288                 # Skip line if the sid is not numeric.
1289                 next unless ($sid =~ /\d+/ );
1290
1291                 # Check if the sid was enabled.
1292                 if ($state eq "enablesid") {
1293                         # Add the sid and its state as enabled to the temporary hash.
1294                         $temphash{$sid} = "enabled";
1295                 # Check if the sid was disabled.
1296                 } elsif ($state eq "disablesid") {
1297                         # Add the sid and its state as disabled to the temporary hash.
1298                         $temphash{$sid} = "disabled";
1299                 # Invalid state - skip the current sid and state.
1300                 } else {
1301                         next;
1302                 }
1303         }
1304
1305         # Close filehandle.
1306         close(FILE);
1307
1308         # Return the hash.
1309         return %temphash;
1310 }
1311
1312 #
1313 ## Private function to convert a given rulefile to a category name.
1314 ## ( No file extension anymore and if the name contained a dot, it
1315 ## would be replaced by a underline sign.)
1316 #
1317 sub _rulefile_to_category($) {
1318         my ($filename) = @_;
1319
1320         # Splitt the filename into single chunks and store them in a
1321         # temorary array.
1322         my @parts = split(/\./, $filename);
1323
1324         # Return / Remove last element of the temporary array.
1325         # This removes the file extension.
1326         pop @parts;
1327
1328         # Join together the single elements of the temporary array.
1329         # If these are more than one, use a "underline" for joining.
1330         my $category = join '_', @parts;
1331
1332         # Return the converted filename.
1333         return $category;
1334 }