html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2020  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 "${General::swroot}/ids-functions.pl";
  32 require "${General::swroot}/network-functions.pl";
  33
  34 # Import ruleset providers file.
  35 require "$IDS::rulesetsourcesfile";
  36
  37 my %color = ();
  38 my %mainsettings = ();
  39 my %idsrules = ();
  40 my %idssettings=();
  41 my %used_providers=();
  42 my %cgiparams=();
  43 my %checked=();
  44 my %selected=();
  45 my %ignored=();
  46
  47 # Read-in main settings, for language, theme and colors.
  48 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  49 &General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
  50
  51 # Get the available network zones, based on the config type of the system and store
  52 # the list of zones in an array.
  53 my @network_zones = &Network::get_available_network_zones();
  54
  55 # Check if openvpn is started and add it to the array of network zones.
  56 if ( -e "/var/run/openvpn.pid") {
  57         push(@network_zones, "ovpn");
  58 }
  59
  60 my $errormessage;
  61
  62 # Create files if they does not exist yet.
  63 &IDS::check_and_create_filelayout();
  64
  65 # Hash which contains the colour code of a network zone.
  66 my %colourhash = (
  67         'red' => $Header::colourred,
  68         'green' => $Header::colourgreen,
  69         'blue' => $Header::colourblue,
  70         'orange' => $Header::colourorange,
  71         'ovpn' => $Header::colourovpn
  72 );
  73
  74 &Header::showhttpheaders();
  75
  76 #Get GUI values
  77 &Header::getcgihash(\%cgiparams);
  78
  79 ## Add/edit an entry to the ignore file.
  80 #
  81 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  82
  83         # Check if any input has been performed.
  84         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  85
  86                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  87                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  88                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  89                 }
  90         } else {
  91                 $errormessage = "$Lang::tr{'guardian empty input'}";
  92         }
  93
  94         # Go further if there was no error.
  95         if ($errormessage eq '') {
  96                 my %ignored = ();
  97                 my $id;
  98                 my $status;
  99
 100                 # Assign hash values.
 101                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 102                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 103
 104                 # Read-in ignoredfile.
 105                 &General::readhasharray($IDS::ignored_file, \%ignored);
 106
 107                 # Check if we should edit an existing entry and got an ID.
 108                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 109                         # Assin the provided id.
 110                         $id = $cgiparams{'ID'};
 111
 112                         # Undef the given ID.
 113                         undef($cgiparams{'ID'});
 114
 115                         # Grab the configured status of the corresponding entry.
 116                         $status = $ignored{$id}[2];
 117                 } else {
 118                         # Each newly added entry automatically should be enabled.
 119                         $status = "enabled";
 120
 121                         # Generate the ID for the new entry.
 122                         #
 123                         # Sort the keys by their ID and store them in an array.
 124                         my @keys = sort { $a <=> $b } keys %ignored;
 125
 126                         # Reverse the key array.
 127                         my @reversed = reverse(@keys);
 128
 129                         # Obtain the last used id.
 130                         my $last_id = @reversed[0];
 131
 132                         # Increase the last id by one and use it as id for the new entry.
 133                         $id = ++$last_id;
 134                 }
 135
 136                 # Add/Modify the entry to/in the ignored hash.
 137                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 138
 139                 # Write the changed ignored hash to the ignored file.
 140                 &General::writehasharray($IDS::ignored_file, \%ignored);
 141
 142                 # Regenerate the ignore file.
 143                 &IDS::generate_ignore_file();
 144         }
 145
 146         # Check if the IDS is running.
 147         if(&IDS::ids_is_running()) {
 148                 # Call suricatactrl to perform a reload.
 149                 &IDS::call_suricatactrl("reload");
 150         }
 151
 152 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 153 #
 154
 155 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 156         my %ignored = ();
 157
 158         # Only go further, if an ID has been passed.
 159         if ($cgiparams{'ID'}) {
 160                 # Assign the given ID.
 161                 my $id = $cgiparams{'ID'};
 162
 163                 # Undef the given ID.
 164                 undef($cgiparams{'ID'});
 165
 166                 # Read-in ignoredfile.
 167                 &General::readhasharray($IDS::ignored_file, \%ignored);
 168
 169                 # Grab the configured status of the corresponding entry.
 170                 my $status = $ignored{$id}[2];
 171
 172                 # Switch the status.
 173                 if ($status eq "disabled") {
 174                         $status = "enabled";
 175                 } else {
 176                         $status = "disabled";
 177                 }
 178
 179                 # Modify the status of the existing entry.
 180                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 181
 182                 # Write the changed ignored hash to the ignored file.
 183                 &General::writehasharray($IDS::ignored_file, \%ignored);
 184
 185                 # Regenerate the ignore file.
 186                 &IDS::generate_ignore_file();
 187
 188                 # Check if the IDS is running.
 189                 if(&IDS::ids_is_running()) {
 190                         # Call suricatactrl to perform a reload.
 191                         &IDS::call_suricatactrl("reload");
 192                 }
 193         }
 194
 195 ## Remove entry from ignore list.
 196 #
 197 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 198         my %ignored = ();
 199
 200         # Read-in ignoredfile.
 201         &General::readhasharray($IDS::ignored_file, \%ignored);
 202
 203         # Drop entry from the hash.
 204         delete($ignored{$cgiparams{'ID'}});
 205
 206         # Undef the given ID.
 207         undef($cgiparams{'ID'});
 208
 209         # Write the changed ignored hash to the ignored file.
 210         &General::writehasharray($IDS::ignored_file, \%ignored);
 211
 212         # Regenerate the ignore file.
 213         &IDS::generate_ignore_file();
 214
 215         # Check if the IDS is running.
 216         if(&IDS::ids_is_running()) {
 217                 # Call suricatactrl to perform a reload.
 218                 &IDS::call_suricatactrl("reload");
 219         }
 220 }
 221
 222 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 223 if (-e $IDS::ids_page_lock_file) {
 224         # Lock the webpage and print notice about autoupgrade of the ruleset
 225         # is in progess.
 226         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 227
 228         # Loop and check if the file still exists.
 229         while(-e $IDS::ids_page_lock_file) {
 230                 # Sleep for a second and re-check.
 231                 sleep 1;
 232         }
 233
 234         # Page has been unlocked, perform a reload.
 235         &reload();
 236 }
 237
 238 # Check if any error has been stored.
 239 if (-e $IDS::storederrorfile) {
 240         # Open file to read in the stored error message.
 241         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 242
 243         # Read the stored error message.
 244         $errormessage = <FILE>;
 245
 246         # Close file.
 247         close (FILE);
 248
 249         # Delete the file, which is now not longer required.
 250         unlink($IDS::storederrorfile);
 251 }
 252
 253 # Gather ruleset details.
 254 if ($cgiparams{'RULESET'}) {
 255         ## Grab all available rules and store them in the idsrules hash.
 256         #
 257
 258         # Get enabled providers.
 259         my @enabled_providers = &IDS::get_enabled_providers();
 260
 261         # Open rules directory and do a directory listing.
 262         opendir(DIR, $IDS::rulespath) or die $!;
 263                 # Loop through the direcory.
 264                 while (my $file = readdir(DIR)) {
 265
 266                         # We only want files.
 267                         next unless (-f "$IDS::rulespath/$file");
 268
 269                         # Ignore empty files.
 270                         next if (-z "$IDS::rulespath/$file");
 271
 272                         # Use a regular expression to find files ending in .rules
 273                         next unless ($file =~ m/\.rules$/);
 274
 275                         # Ignore files which are not read-able.
 276                         next unless (-R "$IDS::rulespath/$file");
 277
 278                         # Skip whitelist rules file.
 279                         next if( $file eq "whitelist.rules");
 280
 281                         # Splitt vendor from filename.
 282                         my @filename_parts = split(/-/, $file);
 283
 284                         # Assign vendor name for easy processing.
 285                         my $vendor = @filename_parts[0];
 286
 287                         # Skip rulefile if the provider is disabled.
 288                         next unless ($vendor ~~ @enabled_providers);
 289
 290                         # Call subfunction to read-in rulefile and add rules to
 291                         # the idsrules hash.
 292                         &readrulesfile("$file");
 293                 }
 294
 295         closedir(DIR);
 296
 297         # Loop through the array of used providers.
 298         foreach my $provider (@enabled_providers) {
 299                 # Gather used rulefiles.
 300                 my @used_rulesfiles = &IDS::read_used_provider_rulesfiles($provider);
 301
 302                 # Loop through the array of used rulesfiles.
 303                 foreach my $rulefile (@used_rulesfiles) {
 304                         # Check if the current rulefile exists in the %idsrules hash.
 305                         # If not, the file probably does not exist anymore or contains
 306                         # no rules.
 307                         if($idsrules{$rulefile}) {
 308                                 # Add the rulefile state to the %idsrules hash.
 309                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 310                         }
 311                 }
 312         }
 313 }
 314
 315 # Save ruleset configuration.
 316 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 317         my %oldsettings;
 318
 319         # Read-in current (old) IDS settings.
 320         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 321
 322         # Prevent form name from been stored in conf file.
 323         delete $cgiparams{'RULESET'};
 324
 325         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 326         if ($IDS::Ruleset::Providers{$cgiparams{'RULES'}}{'requires_subscription'} eq "True") {
 327                 # Check if an subscription/oinkcode has been provided.
 328                 if ($cgiparams{'OINKCODE'}) {
 329                         # Check if the oinkcode contains unallowed chars.
 330                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 331                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 332                         }
 333                 } else {
 334                         # Print an error message, that an subsription/oinkcode is required for this
 335                         # vendor.
 336                         $errormessage = $Lang::tr{'ids oinkcode required'};
 337                 }
 338         }
 339
 340         # Go on if there are no error messages.
 341         if (!$errormessage) {
 342                 # Store settings into settings file.
 343                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 344
 345                 # Check if a ruleset is present - if not or the source has been changed download it.
 346                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 347                         # Check if the red device is active.
 348                         unless (-e "${General::swroot}/red/active") {
 349                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 350                         }
 351
 352                         # Check if enough free disk space is availabe.
 353                         if(&IDS::checkdiskspace()) {
 354                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 355                         }
 356
 357                         # Check if any errors happend.
 358                         unless ($errormessage) {
 359                                 # Lock the webpage and print notice about downloading
 360                                 # a new ruleset.
 361                                 &working_notice("$Lang::tr{'ids working'}");
 362
 363                                 # Write the modify sid's file and pass the taken ruleaction.
 364                                 &IDS::write_modify_sids_file();
 365
 366                                 # Call subfunction to download the ruleset.
 367                                 if(&IDS::downloadruleset()) {
 368                                         $errormessage = $Lang::tr{'could not download latest updates'};
 369
 370                                         # Call function to store the errormessage.
 371                                         &IDS::_store_error_message($errormessage);
 372                                 } else {
 373                                         # Call subfunction to launch oinkmaster.
 374                                         &IDS::oinkmaster();
 375                                 }
 376
 377                                 # Check if the IDS is running.
 378                                 if(&IDS::ids_is_running()) {
 379                                         # Call suricatactrl to stop the IDS - because of the changed
 380                                         # ruleset - the use has to configure it before suricata can be
 381                                         # used again.
 382                                         &IDS::call_suricatactrl("stop");
 383                                 }
 384
 385                                 # Perform a reload of the page.
 386                                 &reload();
 387                         }
 388                 }
 389         }
 390
 391 # Save ruleset.
 392 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 393         # Arrays to store which rulefiles have been enabled and will be used.
 394         my @enabled_rulefiles;
 395
 396         # Hash to store the user-enabled and disabled sids.
 397         my %enabled_disabled_sids;
 398
 399         # Store if a restart of suricata is required.
 400         my $suricata_restart_required;
 401
 402         # Loop through the hash of idsrules.
 403         foreach my $rulefile(keys %idsrules) {
 404                 # Check if the state of the rulefile has been changed.
 405                 unless ($cgiparams{$rulefile} eq $idsrules{$rulefile}{'Rulefile'}{'State'}) {
 406                         # A restart of suricata is required to apply the changes of the used rulefiles.
 407                         $suricata_restart_required = 1;
 408                 }
 409
 410                 # Check if the rulefile is enabled.
 411                 if ($cgiparams{$rulefile} eq "on") {
 412                         # Add rulefile to the array of enabled rulefiles.
 413                         push(@enabled_rulefiles, $rulefile);
 414
 415                         # Drop item from cgiparams hash.
 416                         delete $cgiparams{$rulefile};
 417                 }
 418         }
 419
 420         # Read-in the files for enabled/disabled sids.
 421         # This will be done by calling the read_enabled_disabled_sids_file function two times
 422         # and merge the returned hashes together into the enabled_disabled_sids hash.
 423         %enabled_disabled_sids = (
 424                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 425                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 426
 427         # Loop through the hash of idsrules.
 428         foreach my $rulefile (keys %idsrules) {
 429                 # Loop through the single rules of the rulefile.
 430                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 431                         # Skip the current sid if it is not numeric.
 432                         next unless ($sid =~ /\d+/ );
 433
 434                         # Check if there exists a key in the cgiparams hash for this sid.
 435                         if (exists($cgiparams{$sid})) {
 436                                 # Look if the rule is disabled.
 437                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 438                                         # Check if the state has been set to 'on'.
 439                                         if ($cgiparams{$sid} eq "on") {
 440                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 441                                                 $enabled_disabled_sids{$sid} = "enabled";
 442
 443                                                 # Drop item from cgiparams hash.
 444                                                 delete $cgiparams{$rulefile}{$sid};
 445                                         }
 446                                 }
 447                         } else {
 448                                 # Look if the rule is enabled.
 449                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 450                                         # Check if the state is 'on' and should be disabled.
 451                                         # In this case there is no entry
 452                                         # for the sid in the cgiparams hash.
 453                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 454                                         $enabled_disabled_sids{$sid} = "disabled";
 455
 456                                         # Drop item from cgiparams hash.
 457                                         delete $cgiparams{$rulefile}{$sid};
 458                                 }
 459                         }
 460                 }
 461         }
 462
 463         # Open enabled sid's file for writing.
 464         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 465
 466         # Open disabled sid's file for writing.
 467         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 468
 469         # Write header to the files.
 470         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 471         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 472
 473         # Check if the hash for enabled/disabled files contains any entries.
 474         if (%enabled_disabled_sids) {
 475                 # Loop through the hash.
 476                 foreach my $sid (keys %enabled_disabled_sids) {
 477                         # Check if the sid is enabled.
 478                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 479                                 # Print the sid to the enabled_sids file.
 480                                 print ENABLED_FILE "enablesid $sid\n";
 481                         # Check if the sid is disabled.
 482                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 483                                 # Print the sid to the disabled_sids file.
 484                                 print DISABLED_FILE "disablesid $sid\n";
 485                         # Something strange happende - skip the current sid.
 486                         } else {
 487                                 next;
 488                         }
 489                 }
 490         }
 491
 492         # Close file for enabled_sids after writing.
 493         close(ENABLED_FILE);
 494
 495         # Close file for disabled_sids after writing.
 496         close(DISABLED_FILE);
 497
 498         # Handle enabled / disabled rulefiles.
 499         #
 500         # Get enabled providers.
 501         my @enabled_providers = &IDS::get_enabled_providers();
 502
 503         # Loop through the array of enabled providers.
 504         foreach my $provider(@enabled_providers) {
 505                 # Array to store the rulefiles which belong to the current processed provider.
 506                 my @provider_rulefiles = ();
 507
 508                 # Loop through the array of enabled rulefiles.
 509                 foreach my $rulesfile (@enabled_rulefiles) {
 510                         # Split the rulefile name.
 511                         my @filename_parts = split(/-/, "$rulesfile");
 512
 513                         # Assign vendor name for easy processings.
 514                         my $vendor = @filename_parts[0];
 515
 516                         # Check if the rulesvendor is our current processed enabled provider.
 517                         if ("$vendor" eq "$provider") {
 518                                 # Add the rulesfile to the array of provider rulesfiles.
 519                                 push(@provider_rulefiles, $rulesfile);
 520                         }
 521
 522                         # Check if any rulesfiles have been found for this provider.
 523                         if (@provider_rulefiles) {
 524                                 # Call function and write the providers used rulesfile file.
 525                                 &IDS::write_used_provider_rulefiles_file($provider, @provider_rulefiles);
 526                         }
 527                 }
 528         }
 529
 530         # Call function to generate and write the used rulefiles file.
 531         &IDS::write_main_used_rulefiles_file(@enabled_providers);
 532
 533         # Lock the webpage and print message.
 534         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 535
 536         # Call oinkmaster to alter the ruleset.
 537         &IDS::oinkmaster();
 538
 539         # Check if the IDS is running.
 540         if(&IDS::ids_is_running()) {
 541                 # Check if a restart of suricata is required.
 542                 if ($suricata_restart_required) {
 543                         # Call suricatactrl to perform the restart.
 544                         &IDS::call_suricatactrl("restart");
 545                 } else {
 546                         # Call suricatactrl to perform a reload.
 547                         &IDS::call_suricatactrl("reload");
 548                 }
 549         }
 550
 551         # Reload page.
 552         &reload();
 553
 554 # Download new ruleset.
 555 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 556         # Check if the red device is active.
 557         unless (-e "${General::swroot}/red/active") {
 558                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 559         }
 560
 561         # Check if enought free disk space is availabe.
 562         if(&IDS::checkdiskspace()) {
 563                 $errormessage = "$Lang::tr{'not enough disk space'}";
 564         }
 565
 566         # Check if any errors happend.
 567         unless ($errormessage) {
 568                 # Lock the webpage and print notice about downloading
 569                 # a new ruleset.
 570                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 571
 572                 # Call subfunction to download the ruleset.
 573                 if(&IDS::downloadruleset()) {
 574                         $errormessage = $Lang::tr{'could not download latest updates'};
 575
 576                         # Call function to store the errormessage.
 577                         &IDS::_store_error_message($errormessage);
 578
 579                         # Preform a reload of the page.
 580                         &reload();
 581                 } else {
 582                         # Call subfunction to launch oinkmaster.
 583                         &IDS::oinkmaster();
 584
 585                         # Check if the IDS is running.
 586                         if(&IDS::ids_is_running()) {
 587                                 # Call suricatactrl to perform a reload.
 588                                 &IDS::call_suricatactrl("reload");
 589                         }
 590
 591                         # Perform a reload of the page.
 592                         &reload();
 593                 }
 594         }
 595 # Save IDS settings.
 596 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 597         my %oldidssettings;
 598         my $reload_page;
 599         my $monitored_zones = 0;
 600
 601         # Read-in current (old) IDS settings.
 602         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 603
 604         # Prevent form name from been stored in conf file.
 605         delete $cgiparams{'IDS'};
 606
 607         # Check if the IDS should be enabled.
 608         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 609                 # Check if any ruleset is available. Otherwise abort and display an error.
 610                 unless(%used_providers) {
 611                         $errormessage = $Lang::tr{'ids no ruleset available'};
 612                 }
 613
 614                 # Loop through the array of available interfaces.
 615                 foreach my $zone (@network_zones) {
 616                         # Convert interface name into upper case.
 617                         my $zone_upper = uc($zone);
 618
 619                         # Check if the IDS is enabled for this interaces.
 620                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 621                                 # Increase count.
 622                                 $monitored_zones++;
 623                         }
 624                 }
 625
 626                 # Check if at least one zone should be monitored, or show an error.
 627                 unless ($monitored_zones >= 1) {
 628                         $errormessage = $Lang::tr{'ids no network zone'};
 629                 }
 630         }
 631
 632         # Go on if there are no error messages.
 633         if (!$errormessage) {
 634                 # Store settings into settings file.
 635                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 636         }
 637
 638         # Check if the the automatic rule update hass been touched.
 639         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldidssettings{'AUTOUPDATE_INTERVAL'}) {
 640                 # Call suricatactrl to set the new interval.
 641                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 642         }
 643
 644         # Generate file to store the home net.
 645         &IDS::generate_home_net_file();
 646
 647         # Generate file to the store the DNS servers.
 648         &IDS::generate_dns_servers_file();
 649
 650         # Generate file to store the HTTP ports.
 651         &IDS::generate_http_ports_file();
 652
 653         # Write the modify sid's file and pass the taken ruleaction.
 654         &IDS::write_modify_sids_file();
 655
 656         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 657         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 658                 # Check if a ruleset exists.
 659                 if (%used_providers) {
 660                         # Lock the webpage and print message.
 661                         &working_notice("$Lang::tr{'ids working'}");
 662
 663                         # Call oinkmaster to alter the ruleset.
 664                         &IDS::oinkmaster();
 665
 666                         # Set reload_page to "True".
 667                         $reload_page="True";
 668                 }
 669         }
 670
 671         # Check if the IDS currently is running.
 672         if(&IDS::ids_is_running()) {
 673                 # Check if ENABLE_IDS is set to on.
 674                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 675                         # Call suricatactrl to perform a reload of suricata.
 676                         &IDS::call_suricatactrl("reload");
 677                 } else {
 678                         # Call suricatactrl to stop suricata.
 679                         &IDS::call_suricatactrl("stop");
 680                 }
 681         } else {
 682                 # Call suricatactrl to start suricata.
 683                 &IDS::call_suricatactrl("start");
 684         }
 685
 686         # Check if the page should be reloaded.
 687         if ($reload_page) {
 688                 # Perform a reload of the page.
 689                 &reload();
 690         }
 691
 692 # Toggle Enable/Disable autoupdate for a provider
 693 } elsif ($cgiparams{'AUTOUPDATE'} eq $Lang::tr{'toggle enable disable'}) {
 694         my %used_providers = ();
 695
 696         # Only go further, if an ID has been passed.
 697         if ($cgiparams{'ID'}) {
 698                 # Assign the given ID.
 699                 my $id = $cgiparams{'ID'};
 700
 701                 # Undef the given ID.
 702                 undef($cgiparams{'ID'});
 703
 704                 # Read-in providers settings file.
 705                 &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 706
 707                 # Grab the configured status of the corresponding entry.
 708                 my $status_autoupdate = $used_providers{$id}[2];
 709
 710                 # Switch the status.
 711                 if ($status_autoupdate eq "disabled") {
 712                         $status_autoupdate = "enabled";
 713                 } else {
 714                         $status_autoupdate = "disabled";
 715                 }
 716
 717                 # Modify the status of the existing entry.
 718                 $used_providers{$id} = ["$used_providers{$id}[0]", "$used_providers{$id}[1]", "$status_autoupdate", "$used_providers{$id}[3]"];
 719
 720                 # Write the changed hash to the providers settings file.
 721                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 722         }
 723
 724 # Add/Edit a provider to the list of used providers.
 725 #
 726 } elsif (($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'update'}")) {
 727         my %used_providers = ();
 728
 729         # Read-in providers settings file.
 730         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 731
 732         # Assign some nice human-readable values.
 733         my $provider = $cgiparams{'PROVIDER'};
 734         my $subscription_code = $cgiparams{'SUBSCRIPTION_CODE'};
 735         my $status_autoupdate;
 736
 737         # Handle autoupdate checkbox.
 738         if ($cgiparams{'ENABLE_AUTOUPDATE'} eq "on") {
 739                 $status_autoupdate = "enabled";
 740         } else {
 741                 $status_autoupdate = "disabled";
 742         }
 743
 744         # Check if we are going to add a new provider.
 745         if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") {
 746                 # Loop through the hash of used providers.
 747                 foreach my $id ( keys %used_providers) {
 748                         # Check if the choosen provider is already in use.
 749                         if ($used_providers{$id}[0] eq "$provider") {
 750                                 # XXX - add to language file.
 751                                 # Assign error message.
 752                                 $errormessage = "The choosen provider is already in use.";
 753                         }
 754                 }
 755         }
 756
 757         # Check if the provider requires a subscription code.
 758         if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
 759                 # Check if an subscription code has been provided.
 760                 if ($subscription_code) {
 761                         # Check if the code contains unallowed chars.
 762                         unless ($subscription_code =~ /^[a-z0-9]+$/) {
 763                                 $errormessage = $Lang::tr{'invalid input for subscription code'};
 764                         }
 765                 } else {
 766                         # Print an error message, that an subsription code is required for this
 767                         # provider.
 768                         $errormessage = $Lang::tr{'ids subscription code required'};
 769                 }
 770         }
 771
 772         # Go further if there was no error.
 773         if ($errormessage eq '') {
 774                 my $id;
 775                 my $status;
 776
 777                 # Check if we should edit an existing entry and got an ID.
 778                 if (($cgiparams{'PROVIDERS'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 779                         # Assin the provided id.
 780                         $id = $cgiparams{'ID'};
 781
 782                         # Undef the given ID.
 783                         undef($cgiparams{'ID'});
 784
 785                         # Grab the configured status of the corresponding entry.
 786                         $status = $used_providers{$id}[3];
 787                 } else {
 788                         # Each newly added entry automatically should be enabled.
 789                         $status = "enabled";
 790
 791                         # Generate the ID for the new entry.
 792                         #
 793                         # Sort the keys by their ID and store them in an array.
 794                         my @keys = sort { $a <=> $b } keys %used_providers;
 795
 796                         # Reverse the key array.
 797                         my @reversed = reverse(@keys);
 798
 799                         # Obtain the last used id.
 800                         my $last_id = @reversed[0];
 801
 802                         # Increase the last id by one and use it as id for the new entry.
 803                         $id = ++$last_id;
 804                 }
 805
 806                 # Add/Modify the entry to/in the used providers hash..
 807                 $used_providers{$id} = ["$provider", "$subscription_code", "$status_autoupdate", "$status"];
 808
 809                 # Write the changed hash to the providers settings file.
 810                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 811
 812                 # Check if a new provider will be added.
 813                 if ($cgiparams{'PROVIDERS'} eq $Lang::tr{'add'}) {
 814                         # Lock the webpage and print notice about downloading
 815                         # a new ruleset.
 816                         &working_notice("$Lang::tr{'ids working'}");
 817
 818                         # Download the ruleset.
 819                         &IDS::downloadruleset($provider);
 820
 821                         # Extract the ruleset
 822                         &IDS::extractruleset($provider);
 823
 824                         # Move the ruleset.
 825                         &IDS::move_tmp_ruleset();
 826
 827                         # Cleanup temporary directory.
 828                         &IDS::cleanup_tmp_directory();
 829
 830                         # Create new empty file for used rulefiles
 831                         # for this provider.
 832                         &IDS::write_used_provider_rulefiles_file($provider);
 833
 834                         # Perform a reload of the page.
 835                         &reload();
 836                 }
 837
 838                 # Undefine providers flag.
 839                 undef($cgiparams{'PROVIDERS'});
 840         }
 841
 842 ## Toggle Enabled/Disabled for an existing provider.
 843 #
 844 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'toggle enable disable'}) {
 845         my %used_providers = ();
 846
 847         # Only go further, if an ID has been passed.
 848         if ($cgiparams{'ID'}) {
 849                 # Assign the given ID.
 850                 my $id = $cgiparams{'ID'};
 851
 852                 # Undef the given ID.
 853                 undef($cgiparams{'ID'});
 854
 855                 # Read-in file which contains the provider settings.
 856                 &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 857
 858                 # Grab the configured status of the corresponding entry.
 859                 my $status = $used_providers{$id}[3];
 860
 861                 # Switch the status.
 862                 if ($status eq "enabled") {
 863                         $status = "disabled";
 864                 } else {
 865                         $status = "enabled";
 866                 }
 867
 868                 # Modify the status of the existing entry.
 869                 $used_providers{$id} = ["$used_providers{$id}[0]", "$used_providers{$id}[1]", "$used_providers{$id}[2]", "$status"];
 870
 871                 # Write the changed hash to the providers settings file.
 872                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 873
 874                 # Get all enabled providers.
 875                 my @enabled_providers = &IDS::get_enabled_providers();
 876
 877                 # Write the main providers include file.
 878                 &IDS::write_main_used_rulefiles_file(@enabled_providers);
 879
 880                 # Check if the IDS is running.
 881                 if(&IDS::ids_is_running()) {
 882                         # Gather the amount of enabled providers (elements in the array).
 883                         my $amount = @enabled_providers;
 884
 885                         # Check if there are still enabled ruleset providers.
 886                         if ($amount >= 1) {
 887                                 # Call suricatactrl to perform a restart.
 888                                 &IDS::call_suricatactrl("restart");
 889
 890                         # No active ruleset provider, suricata has to be stopped.
 891                         } else {
 892                                 # Stop suricata.
 893                                 &IDS::call_suricatactrl("stop");
 894                         }
 895                 }
 896
 897                 # Undefine providers flag.
 898                 undef($cgiparams{'PROVIDERS'});
 899         }
 900
 901 ## Remove provider from the list of used providers.
 902 #
 903 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'remove'}) {
 904         my %used_providers = ();
 905
 906         # Read-in provider settings file.
 907         &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 908
 909         # Grab the provider name bevore deleting it from hash.
 910         my $provider = $used_providers{$cgiparams{'ID'}}[0];
 911
 912         # Drop entry from the hash.
 913         delete($used_providers{$cgiparams{'ID'}});
 914
 915         # Undef the given ID.
 916         undef($cgiparams{'ID'});
 917
 918         # Write the changed hash to the provide settings file.
 919         &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 920
 921         # Drop the stored ruleset file.
 922         &IDS::drop_dl_rulesfile($provider);
 923
 924         # Get the name of the provider rulessets include file.
 925         my $provider_used_rulefile = &get_used_provider_rulesfile_file($provider);
 926
 927         # Drop the file, it is not longer needed.
 928         unlink("$provider_used_rulefile");
 929
 930         # Regenerate ruleset.
 931         &IDS::oinkmaster();
 932
 933         # Gather all enabled providers.
 934         my @enabled_providers = &IDS::get_enabled_providers();
 935
 936         # Regenerate main providers include file.
 937         &IDS::write_main_used_rulefiles_file(@enabled_providers);
 938
 939         # Check if the IDS is running.
 940         if(&IDS::ids_is_running()) {
 941                 # Get amount of enabled providers.
 942                 my $amount = @enabled_providers;
 943
 944                 # Check if at least one enabled provider remains.
 945                 if ($amount >= 1) {
 946                         # Call suricatactrl to perform a reload.
 947                         &IDS::call_suricatactrl("restart");
 948
 949                 # Stop suricata if no enabled provider remains.
 950                 } else {
 951                         # Call suricatactrel to perform the stop.
 952                         &IDS::call_suricatactrl("stop");
 953                 }
 954         }
 955
 956         # Undefine providers flag.
 957         undef($cgiparams{'PROVIDERS'});
 958 }
 959
 960 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 961
 962 &Header::openbigbox('100%', 'left', '', $errormessage);
 963
 964 &show_display_error_message();
 965
 966 if ($cgiparams{'RULESET'} eq "$Lang::tr{'ids customize ruleset'}" ) {
 967         &show_customize_ruleset();
 968 } elsif ($cgiparams{'PROVIDERS'} ne "") {
 969         &show_add_provider();
 970 } else {
 971         &show_mainpage();
 972 }
 973
 974 &Header::closebigbox();
 975 &Header::closepage();
 976
 977 #
 978 ## Tiny function to show if a error message happened.
 979 #
 980 sub show_display_error_message() {
 981         if ($errormessage) {
 982                 &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 983                         print "<class name='base'>$errormessage\n";
 984                         print "&nbsp;</class>\n";
 985                 &Header::closebox();
 986         }
 987 }
 988
 989 #
 990 ## Function to display the main IDS page.
 991 #
 992 sub show_mainpage() {
 993         # Read-in idssettings and provider settings.
 994         &General::readhash("$IDS::ids_settings_file", \%idssettings);
 995         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 996
 997         # If no autoupdate intervall has been configured yet, set default value.
 998         unless(exists($idssettings{'AUTOUPDATE_INTERVAL'})) {
 999                 # Set default to "weekly".
1000                 $idssettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
1001         }
1002
1003         # Read-in ignored hosts.
1004         &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
1005
1006         $checked{'ENABLE_IDS'}{'off'} = '';
1007         $checked{'ENABLE_IDS'}{'on'} = '';
1008         $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
1009         $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
1010         $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
1011         $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
1012         $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
1013         $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
1014         $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
1015         $selected{'AUTOUPDATE_INTERVAL'}{$idssettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
1016
1017         # Draw current state of the IDS
1018         &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
1019
1020         # Check if the IDS is running and obtain the process-id.
1021         my $pid = &IDS::ids_is_running();
1022
1023         # Display some useful information, if suricata daemon is running.
1024         if ($pid) {
1025                 # Gather used memory.
1026                 my $memory = &get_memory_usage($pid);
1027
1028                 print <<END;
1029                         <table width='95%' cellspacing='0' class='tbl'>
1030                                 <tr>
1031                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
1032                                 </tr>
1033
1034                                 <tr>
1035                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
1036                                         <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
1037                                 </tr>
1038
1039                                 <tr>
1040                                         <td class='base'></td>
1041                                         <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
1042                                         <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
1043                                 </tr>
1044
1045                                 <tr>
1046                                         <td class='base'></td>
1047                                         <td bgcolor='$color{'color22'}' align='center'>$pid</td>
1048                                         <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
1049                                 </tr>
1050                         </table>
1051 END
1052         } else {
1053                 # Otherwise display a hint that the service is not launched.
1054                 print <<END;
1055                         <table width='95%' cellspacing='0' class='tbl'>
1056                                 <tr>
1057                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
1058                                 </tr>
1059
1060                                 <tr>
1061                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
1062                                         <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
1063                                 </tr>
1064                         </table>
1065 END
1066         }
1067
1068         # Only show this area, if at least one ruleset provider is configured.
1069         if (%used_providers) {
1070
1071 print <<END
1072
1073                 <br><br><h2>$Lang::tr{'settings'}</h2>
1074
1075                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1076                         <table width='100%' border='0'>
1077                                 <tr>
1078                                         <td class='base' colspan='2'>
1079                                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
1080                                         </td>
1081
1082                                         <td class='base' colspan='2'>
1083                                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
1084                                 </td>
1085                                 </tr>
1086
1087                                 <tr>
1088                                         <td><br><br></td>
1089                                         <td><br><br></td>
1090                                         <td><br><br></td>
1091                                         <td><br><br></td>
1092                                 </tr>
1093
1094                                 <tr>
1095                                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
1096                                 </tr>
1097
1098                                 <tr>
1099 END
1100 ;
1101
1102                 # Loop through the array of available networks and print config options.
1103                 foreach my $zone (@network_zones) {
1104                         my $checked_input;
1105                         my $checked_forward;
1106
1107                         # Convert current zone name to upper case.
1108                         my $zone_upper = uc($zone);
1109
1110                         # Set zone name.
1111                         my $zone_name = $zone;
1112
1113                         # Dirty hack to get the correct language string for the red zone.
1114                         if ($zone eq "red") {
1115                                 $zone_name = "red1";
1116                         }
1117
1118                         # Grab checkbox status from settings hash.
1119                         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
1120                                 $checked_input = "checked = 'checked'";
1121                         }
1122
1123                         print "<td class='base' width='20%'>\n";
1124                         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
1125                         print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
1126                         print "</td>\n";
1127                 }
1128
1129 print <<END
1130                                 </tr>
1131
1132                                 <tr>
1133                                         <td><br><br></td>
1134                                         <td><br><br></td>
1135                                         <td><br><br></td>
1136                                         <td><br><br></td>
1137                                 </tr>
1138
1139                                 <tr>
1140                                         <td colspan='4'><b>$Lang::tr{'ids automatic rules update'}</b></td>
1141                                 </tr>
1142
1143                                 <tr>
1144                                         <td>
1145                                                 <select name='AUTOUPDATE_INTERVAL'>
1146                                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
1147                                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
1148                                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
1149                                                 </select>
1150                                         </td>
1151                                 </tr>
1152                         </table>
1153
1154                         <br><br>
1155
1156                         <table width='100%'>
1157                                 <tr>
1158                                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
1159                                 </tr>
1160                         </table>
1161                 </form>
1162 END
1163 ;
1164
1165         }
1166
1167         &Header::closebox();
1168
1169         #
1170         # Used Ruleset Providers section.
1171         #
1172         &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
1173
1174 print <<END;
1175         <table width='100%' border='0'>
1176                 <tr>
1177                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ids provider'}</b></td>
1178                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'date'}</b></td>
1179                         <td class='base' bgcolor='$color{'color20'}' align='center'><b>$Lang::tr{'ids autoupdates'}</b></td>
1180                         <td class='base' bgcolor='$color{'color20'}'></td>
1181                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1182                 </tr>
1183 END
1184                 # Check if some providers has been configured.
1185                 if (keys (%used_providers)) {
1186                         my $col = "";
1187
1188                         # Loop through all entries of the hash.
1189                         foreach my $id (sort keys(%used_providers)) {
1190                                 # Assign data array positions to some nice variable names.
1191                                 my $provider = $used_providers{$id}[0];
1192                                 my $provider_name = &get_provider_name($provider);
1193
1194                                 #XXX my $rulesdate = &IDS::get_ruleset_date($provider);
1195                                 my $rulesdate;
1196
1197                                 my $subscription_code = $used_providers{$id}[1];
1198                                 my $autoupdate_status = $used_providers{$id}[2];
1199                                 my $status  = $used_providers{$id}[3];
1200
1201                                 # Check if the item number is even or not.
1202                                 if ($id % 2) {
1203                                         $col="bgcolor='$color{'color22'}'";
1204                                 } else {
1205                                         $col="bgcolor='$color{'color20'}'";
1206                                 }
1207
1208                                 # Choose icons for the checkboxes.
1209                                 my $status_gif;
1210                                 my $status_gdesc;
1211                                 my $autoupdate_status_gif;
1212                                 my $autoupdate_status_gdesc;
1213
1214                                 # Check if the status is enabled and select the correct image and description.
1215                                 if ($status eq 'enabled' ) {
1216                                         $status_gif = 'on.gif';
1217                                         $status_gdesc = $Lang::tr{'click to disable'};
1218                                 } else {
1219                                         $status_gif = 'off.gif';
1220                                         $status_gdesc = $Lang::tr{'click to enable'};
1221                                 }
1222
1223                                 # Check if the autoupdate status is enabled and select the correct image and description.
1224                                 if ($autoupdate_status eq 'enabled') {
1225                                         $autoupdate_status_gif = 'on.gif';
1226                                         $autoupdate_status_gdesc = $Lang::tr{'click to disable'};
1227                                 } else {
1228                                         $autoupdate_status_gif = 'off.gif';
1229                                         $autoupdate_status_gdesc = $Lang::tr{'click to enable'};
1230                                 }
1231
1232 print <<END;
1233                                 <tr>
1234                                         <td width='33%' class='base' $col>$provider_name</td>
1235                                         <td width='30%' class='base' $col>$rulesdate</td>
1236
1237                                         <td align='center' $col>
1238                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1239                                                         <input type='hidden' name='AUTOUPDATE' value='$Lang::tr{'toggle enable disable'}' />
1240                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$autoupdate_status_gif' alt='$autoupdate_status_gdesc' title='$autoupdate_status_gdesc' />
1241                                                         <input type='hidden' name='ID' value='$id' />
1242                                                 </form>
1243                                         </td>
1244
1245                                         <td align='center' $col>
1246                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1247                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'toggle enable disable'}'>
1248                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$status_gif' alt='$status_gdesc' title='$status_gdesc'>
1249                                                         <input type='hidden' name='ID' value='$id'>
1250                                                 </form>
1251                                         </td>
1252
1253                                         <td align='center' $col>
1254                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1255                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'edit'}'>
1256                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1257                                                         <input type='hidden' name='ID' value='$id'>
1258                                                 </form>
1259                                         </td>
1260
1261                                         <td align='center' $col>
1262                                                 <form method='post' name='$provider' action='$ENV{'SCRIPT_NAME'}'>
1263                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1264                                                         <input type='hidden' name='ID' value='$id'>
1265                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'remove'}'>
1266                                                 </form>
1267                                         </td>
1268                                 </tr>
1269 END
1270                         }
1271
1272                 } else {
1273                         # Print notice that currently no hosts are ignored.
1274                         print "<tr>\n";
1275                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1276                         print "</tr>\n";
1277                 }
1278
1279         print "</table>\n";
1280
1281         # Section to add new elements or edit existing ones.
1282 print <<END;
1283         <br>
1284         <hr>
1285         <br>
1286
1287         <div align='right'>
1288                 <table width='100%'>
1289                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1290                                 <tr>
1291 END
1292
1293                                         # Only show this button if a ruleset provider is configured.
1294                                         if (%used_providers) {
1295                                                 print "<input type='submit' name='RULESET' value='$Lang::tr{'ids customize ruleset'}'>\n";
1296                                         }
1297 print <<END;
1298                                         <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids add provider'}'>
1299                                 </tr>
1300                         </form>
1301                 </table>
1302         </div>
1303 END
1304
1305         &Header::closebox();
1306
1307         #
1308         # Whitelist / Ignorelist
1309         #
1310         &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
1311
1312         print <<END;
1313         <table width='100%'>
1314                 <tr>
1315                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
1316                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
1317                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1318                 </tr>
1319 END
1320                 # Check if some hosts have been added to be ignored.
1321                 if (keys (%ignored)) {
1322                         my $col = "";
1323
1324                         # Loop through all entries of the hash.
1325                         while( (my $key) = each %ignored)  {
1326                                 # Assign data array positions to some nice variable names.
1327                                 my $address = $ignored{$key}[0];
1328                                 my $remark = $ignored{$key}[1];
1329                                 my $status  = $ignored{$key}[2];
1330
1331                                 # Check if the key (id) number is even or not.
1332                                 if ($cgiparams{'ID'} eq $key) {
1333                                         $col="bgcolor='${Header::colouryellow}'";
1334                                 } elsif ($key % 2) {
1335                                         $col="bgcolor='$color{'color22'}'";
1336                                 } else {
1337                                         $col="bgcolor='$color{'color20'}'";
1338                                 }
1339
1340                                 # Choose icon for the checkbox.
1341                                 my $gif;
1342                                 my $gdesc;
1343
1344                                 # Check if the status is enabled and select the correct image and description.
1345                                 if ($status eq 'enabled' ) {
1346                                         $gif = 'on.gif';
1347                                         $gdesc = $Lang::tr{'click to disable'};
1348                                 } else {
1349                                         $gif = 'off.gif';
1350                                         $gdesc = $Lang::tr{'click to enable'};
1351                                 }
1352
1353 print <<END;
1354                                 <tr>
1355                                         <td width='20%' class='base' $col>$address</td>
1356                                         <td width='65%' class='base' $col>$remark</td>
1357
1358                                         <td align='center' $col>
1359                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1360                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}'>
1361                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc'>
1362                                                         <input type='hidden' name='ID' value='$key'>
1363                                                 </form>
1364                                         </td>
1365
1366                                         <td align='center' $col>
1367                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1368                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}'>
1369                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1370                                                         <input type='hidden' name='ID' value='$key'>
1371                                                 </form>
1372                                         </td>
1373
1374                                         <td align='center' $col>
1375                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1376                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1377                                                         <input type='hidden' name='ID' value='$key'>
1378                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1379                                                 </form>
1380                                                 </td>
1381                                         </tr>
1382 END
1383                                 }
1384                         } else {
1385                                 # Print notice that currently no hosts are ignored.
1386                                 print "<tr>\n";
1387                                 print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1388                                 print "</tr>\n";
1389                         }
1390
1391                 print "</table>\n";
1392
1393                 # Section to add new elements or edit existing ones.
1394 print <<END;
1395                 <br>
1396                 <hr>
1397                 <br>
1398
1399                 <div align='center'>
1400                         <table width='100%'>
1401 END
1402
1403                 # Assign correct headline and button text.
1404                 my $buttontext;
1405                 my $entry_address;
1406                 my $entry_remark;
1407
1408                 # Check if an ID (key) has been given, in this case an existing entry should be edited.
1409                 if ($cgiparams{'ID'} ne '') {
1410                         $buttontext = $Lang::tr{'update'};
1411                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1412
1413                                 # Grab address and remark for the given key.
1414                                 $entry_address = $ignored{$cgiparams{'ID'}}[0];
1415                                 $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1416                         } else {
1417                                 $buttontext = $Lang::tr{'add'};
1418                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1419                         }
1420
1421 print <<END;
1422                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1423                                 <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1424                                 <tr>
1425                                         <td width='30%'>$Lang::tr{'ip address'}: </td>
1426                                         <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1427
1428                                         <td width='30%'>$Lang::tr{'remark'}: </td>
1429                                         <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1430                                         <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1431                                 </tr>
1432                                 </form>
1433                         </table>
1434                 </div>
1435 END
1436
1437         &Header::closebox();
1438 }
1439
1440 #
1441 ## Function to show the customize ruleset section.
1442 #
1443 sub show_customize_ruleset() {
1444         ### Java Script ###
1445         print"<script>\n";
1446
1447         # Java script variable declaration for show and hide.
1448         print"var show = \"$Lang::tr{'ids show'}\"\;\n";
1449         print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
1450
1451 print <<END
1452         // Tiny java script function to show/hide the rules
1453         // of a given category.
1454         function showhide(tblname) {
1455                 \$("#" + tblname).toggle();
1456
1457                 // Get current content of the span element.
1458                 var content = document.getElementById("span_" + tblname);
1459
1460                 if (content.innerHTML === show) {
1461                         content.innerHTML = hide;
1462                 } else {
1463                         content.innerHTML = show;
1464                 }
1465         }
1466         </script>
1467 END
1468 ;
1469         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'}" );
1470                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1471
1472                 # Output display table for rule files
1473                 print "<table width='100%'>\n";
1474
1475                 # Loop over each rule file
1476                 foreach my $rulefile (sort keys(%idsrules)) {
1477                         my $rulechecked = '';
1478
1479                         # Check if rule file is enabled
1480                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1481                                 $rulechecked = 'CHECKED';
1482                         }
1483
1484                         # Convert rulefile name into category name.
1485                         my $categoryname = &_rulefile_to_category($rulefile);
1486
1487                         # Table and rows for the rule files.
1488                         print"<tr>\n";
1489                         print"<td class='base' width='5%'>\n";
1490                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1491                         print"</td>\n";
1492                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1493                         print"<td class='base' width='5%' align='right'>\n";
1494                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1495                         print"</td>\n";
1496                         print"</tr>\n";
1497
1498                         # Rows which will be hidden per default and will contain the single rules.
1499                         print"<tr  style='display:none' id='$categoryname'>\n";
1500                         print"<td colspan='3'>\n";
1501
1502                         # Local vars
1503                         my $lines;
1504                         my $rows;
1505                         my $col;
1506
1507                         # New table for the single rules.
1508                         print "<table width='100%'>\n";
1509
1510                         # Loop over rule file rules
1511                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1512                                 # Local vars
1513                                 my $ruledefchecked = '';
1514
1515                                 # Skip rulefile itself.
1516                                 next if ($sid eq "Rulefile");
1517
1518                                 # If 2 rules have been displayed, start a new row
1519                                 if (($lines % 2) == 0) {
1520                                         print "</tr><tr>\n";
1521
1522                                         # Increase rows by once.
1523                                         $rows++;
1524                                 }
1525
1526                                 # Colour lines.
1527                                 if ($rows % 2) {
1528                                         $col="bgcolor='$color{'color20'}'";
1529                                 } else {
1530                                         $col="bgcolor='$color{'color22'}'";
1531                                 }
1532
1533                                 # Set rule state
1534                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1535                                         $ruledefchecked = 'CHECKED';
1536                                 }
1537
1538                                 # Create rule checkbox and display rule description
1539                                 print "<td class='base' width='5%' align='right' $col>\n";
1540                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1541                                 print "</td>\n";
1542                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1543
1544                                 # Increment rule count
1545                                 $lines++;
1546                         }
1547
1548                         # If do not have a second rule for row, create empty cell
1549                         if (($lines % 2) != 0) {
1550                                 print "<td class='base'></td>";
1551                         }
1552
1553                         # Close display table
1554                         print "</tr></table></td></tr>";
1555                 }
1556
1557                 # Close display table
1558                 print "</table>";
1559
1560                 print <<END
1561 <table width='100%'>
1562 <tr>
1563         <td width='100%' align='right'>
1564                 <input type='submit' value='$Lang::tr{'fwhost back'}'>
1565                 <input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'>
1566         </td>
1567 </tr>
1568 </table>
1569 </form>
1570 END
1571 ;
1572                 &Header::closebox();
1573         }
1574 }
1575
1576 #
1577 ## Function to show section for add/edit a provider.
1578 #
1579 sub show_add_provider() {
1580         my %used_providers = ();
1581         my @subscription_providers;
1582
1583         # Read -in providers settings file.
1584         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
1585
1586         # Get all supported ruleset providers.
1587         my @ruleset_providers = &IDS::get_ruleset_providers();
1588
1589         ### Java Script ###
1590         print "<script>\n";
1591
1592         # Generate Java Script Object which contains the URL of the providers.
1593         print "\t// Object, which contains the webpages of the ruleset providers.\n";
1594         print "\tvar url = {\n";
1595
1596         # Loop through the array of supported providers.
1597         foreach my $provider (@ruleset_providers) {
1598                 # Check if the provider requires a subscription.
1599                 if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
1600                         # Add the provider to the array of subscription_providers.
1601                         push(@subscription_providers, $provider);
1602                 }
1603
1604                 # Grab the URL for the provider.
1605                 my $url = $IDS::Ruleset::Providers{$provider}{'website'};
1606
1607                 # Print the URL to the Java Script Object.
1608                 print "\t\t$provider: \"$url\"\,\n";
1609         }
1610
1611         # Close the Java Script Object declaration.
1612         print "\t}\;\n\n";
1613
1614         # Generate Java Script Array which contains the provider that requires a subscription.
1615         my $line = "";
1616         $line = join("', '", @subscription_providers);
1617
1618         print "\t// Array which contains the providers that requires a subscription.\n";
1619         print "\tsubscription_provider = ['$line']\;\n\n";
1620
1621 print <<END
1622         // Java Script function to swap the text input field for
1623         // entering a subscription code.
1624         var update_provider = function() {
1625                 if(inArray(\$('#PROVIDER').val(), subscription_provider)) {
1626                         \$('.subscription_code').show();
1627                 } else {
1628                         \$('.subscription_code').hide();
1629                 }
1630
1631                 // Call function to change the website url.
1632                 change_url(\$('#PROVIDER').val());
1633         };
1634
1635         // Java Script function to check if a given value is part of
1636         // an array.
1637         function inArray(value,array) {
1638                 var count=array.length;
1639
1640                 for(var i=0;i<count;i++) {
1641                         if(array[i]===value){
1642                                 return true;
1643                         }
1644                 }
1645
1646                 return false;
1647         }
1648
1649         // Tiny function to change the website url based on the selected element in the "PROVIDERS"
1650         // dropdown menu.
1651         function change_url(provider) {
1652                 // Get and change the href to the corresponding url.
1653                 document.getElementById("website").href = url[provider];
1654         }
1655
1656         // JQuery function to call corresponding function when
1657         // the ruleset provider is changed or the page is loaded for showing/hiding
1658         // the subscription_code area.
1659         \$(document).ready(function() {
1660                 \$('#PROVIDER').change(update_provider);
1661                         update_provider();
1662         });
1663
1664         </script>
1665 END
1666 ;
1667
1668         &Header::openbox('100%', 'center', $Lang::tr{'ids provider settings'});
1669
1670         # Check if an existing provider should be edited.
1671         if($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1672                 # Check if autoupdate is enabled for this provider.
1673                 if ($used_providers{$cgiparams{'ID'}}[2] eq "enabled") {
1674                         # Set the checkbox to be checked.
1675                         $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1676                 }
1677         } elsif ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'ids add provider'}") {
1678                 # Set the autoupdate to true as default.
1679                 $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1680         }
1681
1682 print <<END
1683         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1684                 <table width='100%' border='0'>
1685                         <tr>
1686                                 <td colspan='2'><b>$Lang::tr{'ids provider'}</b></td>
1687                         </tr>
1688
1689                         <tr>
1690                                 <td width='40%'>
1691                                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1692                                         <select name='PROVIDER' id='PROVIDER'>
1693 END
1694 ;
1695                                                 # Loop through the array of ruleset providers.
1696                                                 foreach my $provider (@ruleset_providers) {
1697                                                         # Get the provider name.
1698                                                         my $provider_name = &get_provider_name($provider);
1699
1700                                                         # Pre-select the provider if one is given.
1701                                                         if (($used_providers{$cgiparams{'ID'}}[0] eq "$provider") || ($cgiparams{'PROVIDER'} eq "$provider")) {
1702                                                                 $selected{$provider} = "selected='selected'";
1703                                                         }
1704
1705                                                         # Add the provider to the dropdown menu.
1706                                                         print "<option value='$provider' $selected{$provider}>$provider_name</option>\n";
1707                                                 }
1708 print <<END
1709                                         </select>
1710                                 </td>
1711
1712                                 <td width='60%'>
1713                                         <b><a id="website" target="_blank" href="#">$Lang::tr{'ids visit provider website'}</a></b>
1714                                 </td>
1715                         </tr>
1716
1717                         <tr>
1718                                 <td colspan='2'><br><br></td>
1719                         </tr>
1720
1721                         <tr class='subscription_code' style='display:none' id='subscription_code'>
1722                                 <td colspan='2'>
1723                                         <table border='0'>
1724                                                 <tr>
1725                                                         <td>
1726                                                                 <b>$Lang::tr{'subscription code'}</b>
1727                                                         </td>
1728                                                 </tr>
1729
1730                                                 <tr>
1731                                                         <td>
1732                                                                 <input type='text' size='40' name='SUBSCRIPTION_CODE' value='$used_providers{$cgiparams{'ID'}}[1]'>
1733                                                         </td>
1734                                                 </tr>
1735
1736                                                 <tr>
1737                                                         <td><br><br></td>
1738                                                 </tr>
1739                                         </table>
1740                                 </td>
1741                         </tr>
1742
1743                         <tr>
1744                                 <td colspan='2'>
1745                                         <input type='checkbox' name='ENABLE_AUTOUPDATE' $checked{'ENABLE_AUTOUPDATE'}>&nbsp;$Lang::tr{'ids enable automatic updates'}
1746                                 </td>
1747                         </tr>
1748
1749                         <tr>
1750                                 <td colspan='2' align='right'>
1751                                         <input type='submit' value='$Lang::tr{'back'}'>
1752 END
1753 ;
1754                                 # Check if a provider should be added or edited.
1755                                 if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1756                                         # Display button for updating the existing provider.
1757                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'update'}'>\n";
1758                                 } else {
1759                                         # Display button to add the new provider.
1760                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'add'}'>\n";
1761                                 }
1762 print <<END
1763                                 </td>
1764                         </tr>
1765                 </table>
1766         </form>
1767 END
1768 ;
1769         &Header::closebox();
1770 }
1771
1772 #
1773 ## A function to display a notice, to lock the webpage and
1774 ## tell the user which action currently will be performed.
1775 #
1776 sub working_notice ($) {
1777         my ($message) = @_;
1778
1779         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1780         &Header::openbigbox('100%', 'left', '', $errormessage);
1781         &Header::openbox( 'Waiting', 1,);
1782                 print <<END;
1783                         <table>
1784                                 <tr>
1785                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1786                                         <td>$message</td>
1787                                 </tr>
1788                         </table>
1789 END
1790         &Header::closebox();
1791         &Header::closebigbox();
1792         &Header::closepage();
1793 }
1794
1795 #
1796 ## A tiny function to perform a reload of the webpage after one second.
1797 #
1798 sub reload () {
1799         print "<meta http-equiv='refresh' content='1'>\n";
1800
1801         # Stop the script.
1802         exit;
1803 }
1804
1805 #
1806 ## Private function to read-in and parse rules of a given rulefile.
1807 #
1808 ## The given file will be read, parsed and all valid rules will be stored by ID,
1809 ## message/description and it's state in the idsrules hash.
1810 #
1811 sub readrulesfile ($) {
1812         my $rulefile = shift;
1813
1814         # Open rule file and read in contents
1815         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1816
1817         # Store file content in an array.
1818         my @lines = <RULEFILE>;
1819
1820         # Close file.
1821         close(RULEFILE);
1822
1823         # Loop over rule file contents
1824         foreach my $line (@lines) {
1825                 # Remove whitespaces.
1826                 chomp $line;
1827
1828                 # Skip blank  lines.
1829                 next if ($line =~ /^\s*$/);
1830
1831                 # Local vars.
1832                 my $sid;
1833                 my $msg;
1834
1835                 # Gather rule sid and message from the ruleline.
1836                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1837                         $msg = $1;
1838                         $sid = $2;
1839
1840                         # Check if a rule has been found.
1841                         if ($sid && $msg) {
1842                                 # Add rule to the idsrules hash.
1843                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1844
1845                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1846                                 if ($line =~ /^\#/) {
1847                                         # If yes, the rule is disabled.
1848                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1849                                 } else {
1850                                         # Otherwise the rule is enabled.
1851                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1852                                 }
1853                         }
1854                 }
1855         }
1856 }
1857
1858 #
1859 ## Function to get the used memory of a given process-id.
1860 #
1861 sub get_memory_usage($) {
1862         my ($pid) = @_;
1863
1864         my $memory = 0;
1865
1866         # Try to open the status file for the given process-id on the pseudo
1867         # file system proc.
1868         if (open(FILE, "/proc/$pid/status")) {
1869                 # Loop through the entire file.
1870                 while (<FILE>) {
1871                         # Splitt current line content and store them into variables.
1872                         my ($key, $value) = split(":", $_, 2);
1873
1874                         # Check if the current key is the one which contains the memory usage.
1875                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1876                         # of the entire process.
1877                         if ($key eq "VmRSS") {
1878                                 # Found the memory usage add it to the memory variable.
1879                                 $memory += $value;
1880
1881                                 # Break the loop.
1882                                 last;
1883                         }
1884                 }
1885
1886                 # Close file handle.
1887                 close(FILE);
1888
1889                 # Return memory usage.
1890                 return $memory;
1891         }
1892
1893         # If the file could not be open, return nothing.
1894         return;
1895 }
1896
1897 #
1898 ## Function to read-in the given enabled or disables sids file.
1899 #
1900 sub read_enabled_disabled_sids_file($) {
1901         my ($file) = @_;
1902
1903         # Temporary hash to store the sids and their state. It will be
1904         # returned at the end of this function.
1905         my %temphash;
1906
1907         # Open the given filename.
1908         open(FILE, "$file") or die "Could not open $file. $!\n";
1909
1910         # Loop through the file.
1911         while(<FILE>) {
1912                 # Remove newlines.
1913                 chomp $_;
1914
1915                 # Skip blank lines.
1916                 next if ($_ =~ /^\s*$/);
1917
1918                 # Skip coments.
1919                 next if ($_ =~ /^\#/);
1920
1921                 # Splitt line into sid and state part.
1922                 my ($state, $sid) = split(" ", $_);
1923
1924                 # Skip line if the sid is not numeric.
1925                 next unless ($sid =~ /\d+/ );
1926
1927                 # Check if the sid was enabled.
1928                 if ($state eq "enablesid") {
1929                         # Add the sid and its state as enabled to the temporary hash.
1930                         $temphash{$sid} = "enabled";
1931                 # Check if the sid was disabled.
1932                 } elsif ($state eq "disablesid") {
1933                         # Add the sid and its state as disabled to the temporary hash.
1934                         $temphash{$sid} = "disabled";
1935                 # Invalid state - skip the current sid and state.
1936                 } else {
1937                         next;
1938                 }
1939         }
1940
1941         # Close filehandle.
1942         close(FILE);
1943
1944         # Return the hash.
1945         return %temphash;
1946 }
1947
1948 #
1949 ## Function to get the provider name from the language file or providers file for a given handle.
1950 #
1951 sub get_provider_name($) {
1952         my ($handle) = @_;
1953         my $provider_name;
1954
1955         # Get the required translation string for the given provider handle.
1956         my $tr_string = $IDS::Ruleset::Providers{$handle}{'tr_string'};
1957
1958         # Check if the translation string is available in the language files.
1959         if ($Lang::tr{$tr_string}) {
1960                 # Use the translated string from the language file.
1961                 $provider_name = $Lang::tr{$tr_string};
1962         } else {
1963                 # Fallback and use the provider summary from the providers file.
1964                 $provider_name = $IDS::Ruleset::Providers{$handle}{'summary'};
1965         }
1966
1967         # Return the obtained provider name.
1968         return $provider_name;
1969 }
1970
1971 #
1972 ## Private function to convert a given rulefile to a category name.
1973 ## ( No file extension anymore and if the name contained a dot, it
1974 ## would be replaced by a underline sign.)
1975 #
1976 sub _rulefile_to_category($) {
1977         my ($filename) = @_;
1978
1979         # Splitt the filename into single chunks and store them in a
1980         # temorary array.
1981         my @parts = split(/\./, $filename);
1982
1983         # Return / Remove last element of the temporary array.
1984         # This removes the file extension.
1985         pop @parts;
1986
1987         # Join together the single elements of the temporary array.
1988         # If these are more than one, use a "underline" for joining.
1989         my $category = join '_', @parts;
1990
1991         # Return the converted filename.
1992         return $category;
1993 }