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                 # XXX - The ruleset needs to be regenerated
 875                 # XXX - Suricata requires a reload or if the last provider
 876                 #       has been disabled suricata needs to be stopped.
 877                 # Check if the IDS is running.
 878                 #if(&IDS::ids_is_running()) {
 879                 #       # Call suricatactrl to perform a reload.
 880                 #       &IDS::call_suricatactrl("reload");
 881                 #}
 882
 883                 # Undefine providers flag.
 884                 undef($cgiparams{'PROVIDERS'});
 885         }
 886
 887 ## Remove provider from the list of used providers.
 888 #
 889 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'remove'}) {
 890         my %used_providers = ();
 891
 892         # Read-in provider settings file.
 893         &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 894
 895         # Drop entry from the hash.
 896         delete($used_providers{$cgiparams{'ID'}});
 897
 898         # Undef the given ID.
 899         undef($cgiparams{'ID'});
 900
 901         # Write the changed hash to the provide settings file.
 902         &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 903
 904         # XXX - The ruleset of the provider needs to be dropped.
 905         # XXX - The remain rulest of suricata needs to be regenerated.
 906         # XXX - Suricata requires a reload or if the last provider has
 907         #       been removed it has to be stopped.
 908         # Check if the IDS is running.
 909         #if(&IDS::ids_is_running()) {
 910         # Call suricatactrl to perform a reload.
 911         #       &IDS::call_suricatactrl("reload");
 912         #}
 913
 914         # Undefine providers flag.
 915         undef($cgiparams{'PROVIDERS'});
 916 }
 917
 918 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 919
 920 &Header::openbigbox('100%', 'left', '', $errormessage);
 921
 922 &show_display_error_message();
 923
 924 if ($cgiparams{'RULESET'} eq "$Lang::tr{'ids customize ruleset'}" ) {
 925         &show_customize_ruleset();
 926 } elsif ($cgiparams{'PROVIDERS'} ne "") {
 927         &show_add_provider();
 928 } else {
 929         &show_mainpage();
 930 }
 931
 932 &Header::closebigbox();
 933 &Header::closepage();
 934
 935 #
 936 ## Tiny function to show if a error message happened.
 937 #
 938 sub show_display_error_message() {
 939         if ($errormessage) {
 940                 &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 941                         print "<class name='base'>$errormessage\n";
 942                         print "&nbsp;</class>\n";
 943                 &Header::closebox();
 944         }
 945 }
 946
 947 #
 948 ## Function to display the main IDS page.
 949 #
 950 sub show_mainpage() {
 951         # Read-in idssettings and provider settings.
 952         &General::readhash("$IDS::ids_settings_file", \%idssettings);
 953         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 954
 955         # If no autoupdate intervall has been configured yet, set default value.
 956         unless(exists($idssettings{'AUTOUPDATE_INTERVAL'})) {
 957                 # Set default to "weekly".
 958                 $idssettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 959         }
 960
 961         # Read-in ignored hosts.
 962         &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 963
 964         $checked{'ENABLE_IDS'}{'off'} = '';
 965         $checked{'ENABLE_IDS'}{'on'} = '';
 966         $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 967         $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 968         $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 969         $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 970         $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 971         $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 972         $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 973         $selected{'AUTOUPDATE_INTERVAL'}{$idssettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 974
 975         # Draw current state of the IDS
 976         &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 977
 978         # Check if the IDS is running and obtain the process-id.
 979         my $pid = &IDS::ids_is_running();
 980
 981         # Display some useful information, if suricata daemon is running.
 982         if ($pid) {
 983                 # Gather used memory.
 984                 my $memory = &get_memory_usage($pid);
 985
 986                 print <<END;
 987                         <table width='95%' cellspacing='0' class='tbl'>
 988                                 <tr>
 989                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 990                                 </tr>
 991
 992                                 <tr>
 993                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
 994                                         <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 995                                 </tr>
 996
 997                                 <tr>
 998                                         <td class='base'></td>
 999                                         <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
1000                                         <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
1001                                 </tr>
1002
1003                                 <tr>
1004                                         <td class='base'></td>
1005                                         <td bgcolor='$color{'color22'}' align='center'>$pid</td>
1006                                         <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
1007                                 </tr>
1008                         </table>
1009 END
1010         } else {
1011                 # Otherwise display a hint that the service is not launched.
1012                 print <<END;
1013                         <table width='95%' cellspacing='0' class='tbl'>
1014                                 <tr>
1015                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
1016                                 </tr>
1017
1018                                 <tr>
1019                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
1020                                         <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
1021                                 </tr>
1022                         </table>
1023 END
1024         }
1025
1026         # Only show this area, if at least one ruleset provider is configured.
1027         if (%used_providers) {
1028
1029 print <<END
1030
1031                 <br><br><h2>$Lang::tr{'settings'}</h2>
1032
1033                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1034                         <table width='100%' border='0'>
1035                                 <tr>
1036                                         <td class='base' colspan='2'>
1037                                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
1038                                         </td>
1039
1040                                         <td class='base' colspan='2'>
1041                                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
1042                                 </td>
1043                                 </tr>
1044
1045                                 <tr>
1046                                         <td><br><br></td>
1047                                         <td><br><br></td>
1048                                         <td><br><br></td>
1049                                         <td><br><br></td>
1050                                 </tr>
1051
1052                                 <tr>
1053                                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
1054                                 </tr>
1055
1056                                 <tr>
1057 END
1058 ;
1059
1060                 # Loop through the array of available networks and print config options.
1061                 foreach my $zone (@network_zones) {
1062                         my $checked_input;
1063                         my $checked_forward;
1064
1065                         # Convert current zone name to upper case.
1066                         my $zone_upper = uc($zone);
1067
1068                         # Set zone name.
1069                         my $zone_name = $zone;
1070
1071                         # Dirty hack to get the correct language string for the red zone.
1072                         if ($zone eq "red") {
1073                                 $zone_name = "red1";
1074                         }
1075
1076                         # Grab checkbox status from settings hash.
1077                         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
1078                                 $checked_input = "checked = 'checked'";
1079                         }
1080
1081                         print "<td class='base' width='20%'>\n";
1082                         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
1083                         print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
1084                         print "</td>\n";
1085                 }
1086
1087 print <<END
1088                                 </tr>
1089
1090                                 <tr>
1091                                         <td><br><br></td>
1092                                         <td><br><br></td>
1093                                         <td><br><br></td>
1094                                         <td><br><br></td>
1095                                 </tr>
1096
1097                                 <tr>
1098                                         <td colspan='4'><b>$Lang::tr{'ids automatic rules update'}</b></td>
1099                                 </tr>
1100
1101                                 <tr>
1102                                         <td>
1103                                                 <select name='AUTOUPDATE_INTERVAL'>
1104                                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
1105                                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
1106                                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
1107                                                 </select>
1108                                         </td>
1109                                 </tr>
1110                         </table>
1111
1112                         <br><br>
1113
1114                         <table width='100%'>
1115                                 <tr>
1116                                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
1117                                 </tr>
1118                         </table>
1119                 </form>
1120 END
1121 ;
1122
1123         }
1124
1125         &Header::closebox();
1126
1127         #
1128         # Used Ruleset Providers section.
1129         #
1130         &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
1131
1132 print <<END;
1133         <table width='100%' border='0'>
1134                 <tr>
1135                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ids provider'}</b></td>
1136                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'date'}</b></td>
1137                         <td class='base' bgcolor='$color{'color20'}' align='center'><b>$Lang::tr{'ids autoupdates'}</b></td>
1138                         <td class='base' bgcolor='$color{'color20'}'></td>
1139                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1140                 </tr>
1141 END
1142                 # Check if some providers has been configured.
1143                 if (keys (%used_providers)) {
1144                         my $col = "";
1145
1146                         # Loop through all entries of the hash.
1147                         foreach my $id (sort keys(%used_providers)) {
1148                                 # Assign data array positions to some nice variable names.
1149                                 my $provider = $used_providers{$id}[0];
1150                                 my $provider_name = &get_provider_name($provider);
1151
1152                                 #XXX my $rulesdate = &IDS::get_ruleset_date($provider);
1153                                 my $rulesdate;
1154
1155                                 my $subscription_code = $used_providers{$id}[1];
1156                                 my $autoupdate_status = $used_providers{$id}[2];
1157                                 my $status  = $used_providers{$id}[3];
1158
1159                                 # Check if the item number is even or not.
1160                                 if ($id % 2) {
1161                                         $col="bgcolor='$color{'color22'}'";
1162                                 } else {
1163                                         $col="bgcolor='$color{'color20'}'";
1164                                 }
1165
1166                                 # Choose icons for the checkboxes.
1167                                 my $status_gif;
1168                                 my $status_gdesc;
1169                                 my $autoupdate_status_gif;
1170                                 my $autoupdate_status_gdesc;
1171
1172                                 # Check if the status is enabled and select the correct image and description.
1173                                 if ($status eq 'enabled' ) {
1174                                         $status_gif = 'on.gif';
1175                                         $status_gdesc = $Lang::tr{'click to disable'};
1176                                 } else {
1177                                         $status_gif = 'off.gif';
1178                                         $status_gdesc = $Lang::tr{'click to enable'};
1179                                 }
1180
1181                                 # Check if the autoupdate status is enabled and select the correct image and description.
1182                                 if ($autoupdate_status eq 'enabled') {
1183                                         $autoupdate_status_gif = 'on.gif';
1184                                         $autoupdate_status_gdesc = $Lang::tr{'click to disable'};
1185                                 } else {
1186                                         $autoupdate_status_gif = 'off.gif';
1187                                         $autoupdate_status_gdesc = $Lang::tr{'click to enable'};
1188                                 }
1189
1190 print <<END;
1191                                 <tr>
1192                                         <td width='33%' class='base' $col>$provider_name</td>
1193                                         <td width='30%' class='base' $col>$rulesdate</td>
1194
1195                                         <td align='center' $col>
1196                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1197                                                         <input type='hidden' name='AUTOUPDATE' value='$Lang::tr{'toggle enable disable'}' />
1198                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$autoupdate_status_gif' alt='$autoupdate_status_gdesc' title='$autoupdate_status_gdesc' />
1199                                                         <input type='hidden' name='ID' value='$id' />
1200                                                 </form>
1201                                         </td>
1202
1203                                         <td align='center' $col>
1204                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1205                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'toggle enable disable'}'>
1206                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$status_gif' alt='$status_gdesc' title='$status_gdesc'>
1207                                                         <input type='hidden' name='ID' value='$id'>
1208                                                 </form>
1209                                         </td>
1210
1211                                         <td align='center' $col>
1212                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1213                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'edit'}'>
1214                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1215                                                         <input type='hidden' name='ID' value='$id'>
1216                                                 </form>
1217                                         </td>
1218
1219                                         <td align='center' $col>
1220                                                 <form method='post' name='$provider' action='$ENV{'SCRIPT_NAME'}'>
1221                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1222                                                         <input type='hidden' name='ID' value='$id'>
1223                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'remove'}'>
1224                                                 </form>
1225                                         </td>
1226                                 </tr>
1227 END
1228                         }
1229
1230                 } else {
1231                         # Print notice that currently no hosts are ignored.
1232                         print "<tr>\n";
1233                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1234                         print "</tr>\n";
1235                 }
1236
1237         print "</table>\n";
1238
1239         # Section to add new elements or edit existing ones.
1240 print <<END;
1241         <br>
1242         <hr>
1243         <br>
1244
1245         <div align='right'>
1246                 <table width='100%'>
1247                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1248                                 <tr>
1249 END
1250
1251                                         # Only show this button if a ruleset provider is configured.
1252                                         if (%used_providers) {
1253                                                 print "<input type='submit' name='RULESET' value='$Lang::tr{'ids customize ruleset'}'>\n";
1254                                         }
1255 print <<END;
1256                                         <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids add provider'}'>
1257                                 </tr>
1258                         </form>
1259                 </table>
1260         </div>
1261 END
1262
1263         &Header::closebox();
1264
1265         #
1266         # Whitelist / Ignorelist
1267         #
1268         &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
1269
1270         print <<END;
1271         <table width='100%'>
1272                 <tr>
1273                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
1274                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
1275                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1276                 </tr>
1277 END
1278                 # Check if some hosts have been added to be ignored.
1279                 if (keys (%ignored)) {
1280                         my $col = "";
1281
1282                         # Loop through all entries of the hash.
1283                         while( (my $key) = each %ignored)  {
1284                                 # Assign data array positions to some nice variable names.
1285                                 my $address = $ignored{$key}[0];
1286                                 my $remark = $ignored{$key}[1];
1287                                 my $status  = $ignored{$key}[2];
1288
1289                                 # Check if the key (id) number is even or not.
1290                                 if ($cgiparams{'ID'} eq $key) {
1291                                         $col="bgcolor='${Header::colouryellow}'";
1292                                 } elsif ($key % 2) {
1293                                         $col="bgcolor='$color{'color22'}'";
1294                                 } else {
1295                                         $col="bgcolor='$color{'color20'}'";
1296                                 }
1297
1298                                 # Choose icon for the checkbox.
1299                                 my $gif;
1300                                 my $gdesc;
1301
1302                                 # Check if the status is enabled and select the correct image and description.
1303                                 if ($status eq 'enabled' ) {
1304                                         $gif = 'on.gif';
1305                                         $gdesc = $Lang::tr{'click to disable'};
1306                                 } else {
1307                                         $gif = 'off.gif';
1308                                         $gdesc = $Lang::tr{'click to enable'};
1309                                 }
1310
1311 print <<END;
1312                                 <tr>
1313                                         <td width='20%' class='base' $col>$address</td>
1314                                         <td width='65%' class='base' $col>$remark</td>
1315
1316                                         <td align='center' $col>
1317                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1318                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}'>
1319                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc'>
1320                                                         <input type='hidden' name='ID' value='$key'>
1321                                                 </form>
1322                                         </td>
1323
1324                                         <td align='center' $col>
1325                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1326                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}'>
1327                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1328                                                         <input type='hidden' name='ID' value='$key'>
1329                                                 </form>
1330                                         </td>
1331
1332                                         <td align='center' $col>
1333                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1334                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1335                                                         <input type='hidden' name='ID' value='$key'>
1336                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1337                                                 </form>
1338                                                 </td>
1339                                         </tr>
1340 END
1341                                 }
1342                         } else {
1343                                 # Print notice that currently no hosts are ignored.
1344                                 print "<tr>\n";
1345                                 print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1346                                 print "</tr>\n";
1347                         }
1348
1349                 print "</table>\n";
1350
1351                 # Section to add new elements or edit existing ones.
1352 print <<END;
1353                 <br>
1354                 <hr>
1355                 <br>
1356
1357                 <div align='center'>
1358                         <table width='100%'>
1359 END
1360
1361                 # Assign correct headline and button text.
1362                 my $buttontext;
1363                 my $entry_address;
1364                 my $entry_remark;
1365
1366                 # Check if an ID (key) has been given, in this case an existing entry should be edited.
1367                 if ($cgiparams{'ID'} ne '') {
1368                         $buttontext = $Lang::tr{'update'};
1369                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1370
1371                                 # Grab address and remark for the given key.
1372                                 $entry_address = $ignored{$cgiparams{'ID'}}[0];
1373                                 $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1374                         } else {
1375                                 $buttontext = $Lang::tr{'add'};
1376                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1377                         }
1378
1379 print <<END;
1380                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1381                                 <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1382                                 <tr>
1383                                         <td width='30%'>$Lang::tr{'ip address'}: </td>
1384                                         <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1385
1386                                         <td width='30%'>$Lang::tr{'remark'}: </td>
1387                                         <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1388                                         <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1389                                 </tr>
1390                                 </form>
1391                         </table>
1392                 </div>
1393 END
1394
1395         &Header::closebox();
1396 }
1397
1398 #
1399 ## Function to show the customize ruleset section.
1400 #
1401 sub show_customize_ruleset() {
1402         ### Java Script ###
1403         print"<script>\n";
1404
1405         # Java script variable declaration for show and hide.
1406         print"var show = \"$Lang::tr{'ids show'}\"\;\n";
1407         print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
1408
1409 print <<END
1410         // Tiny java script function to show/hide the rules
1411         // of a given category.
1412         function showhide(tblname) {
1413                 \$("#" + tblname).toggle();
1414
1415                 // Get current content of the span element.
1416                 var content = document.getElementById("span_" + tblname);
1417
1418                 if (content.innerHTML === show) {
1419                         content.innerHTML = hide;
1420                 } else {
1421                         content.innerHTML = show;
1422                 }
1423         }
1424         </script>
1425 END
1426 ;
1427         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'}" );
1428                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1429
1430                 # Output display table for rule files
1431                 print "<table width='100%'>\n";
1432
1433                 # Loop over each rule file
1434                 foreach my $rulefile (sort keys(%idsrules)) {
1435                         my $rulechecked = '';
1436
1437                         # Check if rule file is enabled
1438                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1439                                 $rulechecked = 'CHECKED';
1440                         }
1441
1442                         # Convert rulefile name into category name.
1443                         my $categoryname = &_rulefile_to_category($rulefile);
1444
1445                         # Table and rows for the rule files.
1446                         print"<tr>\n";
1447                         print"<td class='base' width='5%'>\n";
1448                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1449                         print"</td>\n";
1450                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1451                         print"<td class='base' width='5%' align='right'>\n";
1452                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1453                         print"</td>\n";
1454                         print"</tr>\n";
1455
1456                         # Rows which will be hidden per default and will contain the single rules.
1457                         print"<tr  style='display:none' id='$categoryname'>\n";
1458                         print"<td colspan='3'>\n";
1459
1460                         # Local vars
1461                         my $lines;
1462                         my $rows;
1463                         my $col;
1464
1465                         # New table for the single rules.
1466                         print "<table width='100%'>\n";
1467
1468                         # Loop over rule file rules
1469                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1470                                 # Local vars
1471                                 my $ruledefchecked = '';
1472
1473                                 # Skip rulefile itself.
1474                                 next if ($sid eq "Rulefile");
1475
1476                                 # If 2 rules have been displayed, start a new row
1477                                 if (($lines % 2) == 0) {
1478                                         print "</tr><tr>\n";
1479
1480                                         # Increase rows by once.
1481                                         $rows++;
1482                                 }
1483
1484                                 # Colour lines.
1485                                 if ($rows % 2) {
1486                                         $col="bgcolor='$color{'color20'}'";
1487                                 } else {
1488                                         $col="bgcolor='$color{'color22'}'";
1489                                 }
1490
1491                                 # Set rule state
1492                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1493                                         $ruledefchecked = 'CHECKED';
1494                                 }
1495
1496                                 # Create rule checkbox and display rule description
1497                                 print "<td class='base' width='5%' align='right' $col>\n";
1498                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1499                                 print "</td>\n";
1500                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1501
1502                                 # Increment rule count
1503                                 $lines++;
1504                         }
1505
1506                         # If do not have a second rule for row, create empty cell
1507                         if (($lines % 2) != 0) {
1508                                 print "<td class='base'></td>";
1509                         }
1510
1511                         # Close display table
1512                         print "</tr></table></td></tr>";
1513                 }
1514
1515                 # Close display table
1516                 print "</table>";
1517
1518                 print <<END
1519 <table width='100%'>
1520 <tr>
1521         <td width='100%' align='right'>
1522                 <input type='submit' value='$Lang::tr{'fwhost back'}'>
1523                 <input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'>
1524         </td>
1525 </tr>
1526 </table>
1527 </form>
1528 END
1529 ;
1530                 &Header::closebox();
1531         }
1532 }
1533
1534 #
1535 ## Function to show section for add/edit a provider.
1536 #
1537 sub show_add_provider() {
1538         my %used_providers = ();
1539         my @subscription_providers;
1540
1541         # Read -in providers settings file.
1542         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
1543
1544         # Get all supported ruleset providers.
1545         my @ruleset_providers = &IDS::get_ruleset_providers();
1546
1547         ### Java Script ###
1548         print "<script>\n";
1549
1550         # Generate Java Script Object which contains the URL of the providers.
1551         print "\t// Object, which contains the webpages of the ruleset providers.\n";
1552         print "\tvar url = {\n";
1553
1554         # Loop through the array of supported providers.
1555         foreach my $provider (@ruleset_providers) {
1556                 # Check if the provider requires a subscription.
1557                 if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
1558                         # Add the provider to the array of subscription_providers.
1559                         push(@subscription_providers, $provider);
1560                 }
1561
1562                 # Grab the URL for the provider.
1563                 my $url = $IDS::Ruleset::Providers{$provider}{'website'};
1564
1565                 # Print the URL to the Java Script Object.
1566                 print "\t\t$provider: \"$url\"\,\n";
1567         }
1568
1569         # Close the Java Script Object declaration.
1570         print "\t}\;\n\n";
1571
1572         # Generate Java Script Array which contains the provider that requires a subscription.
1573         my $line = "";
1574         $line = join("', '", @subscription_providers);
1575
1576         print "\t// Array which contains the providers that requires a subscription.\n";
1577         print "\tsubscription_provider = ['$line']\;\n\n";
1578
1579 print <<END
1580         // Java Script function to swap the text input field for
1581         // entering a subscription code.
1582         var update_provider = function() {
1583                 if(inArray(\$('#PROVIDER').val(), subscription_provider)) {
1584                         \$('.subscription_code').show();
1585                 } else {
1586                         \$('.subscription_code').hide();
1587                 }
1588
1589                 // Call function to change the website url.
1590                 change_url(\$('#PROVIDER').val());
1591         };
1592
1593         // Java Script function to check if a given value is part of
1594         // an array.
1595         function inArray(value,array) {
1596                 var count=array.length;
1597
1598                 for(var i=0;i<count;i++) {
1599                         if(array[i]===value){
1600                                 return true;
1601                         }
1602                 }
1603
1604                 return false;
1605         }
1606
1607         // Tiny function to change the website url based on the selected element in the "PROVIDERS"
1608         // dropdown menu.
1609         function change_url(provider) {
1610                 // Get and change the href to the corresponding url.
1611                 document.getElementById("website").href = url[provider];
1612         }
1613
1614         // JQuery function to call corresponding function when
1615         // the ruleset provider is changed or the page is loaded for showing/hiding
1616         // the subscription_code area.
1617         \$(document).ready(function() {
1618                 \$('#PROVIDER').change(update_provider);
1619                         update_provider();
1620         });
1621
1622         </script>
1623 END
1624 ;
1625
1626         &Header::openbox('100%', 'center', $Lang::tr{'ids provider settings'});
1627
1628         # Check if an existing provider should be edited.
1629         if($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1630                 # Check if autoupdate is enabled for this provider.
1631                 if ($used_providers{$cgiparams{'ID'}}[2] eq "enabled") {
1632                         # Set the checkbox to be checked.
1633                         $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1634                 }
1635         } elsif ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'ids add provider'}") {
1636                 # Set the autoupdate to true as default.
1637                 $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1638         }
1639
1640 print <<END
1641         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1642                 <table width='100%' border='0'>
1643                         <tr>
1644                                 <td colspan='2'><b>$Lang::tr{'ids provider'}</b></td>
1645                         </tr>
1646
1647                         <tr>
1648                                 <td width='40%'>
1649                                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1650                                         <select name='PROVIDER' id='PROVIDER'>
1651 END
1652 ;
1653                                                 # Loop through the array of ruleset providers.
1654                                                 foreach my $provider (@ruleset_providers) {
1655                                                         # Get the provider name.
1656                                                         my $provider_name = &get_provider_name($provider);
1657
1658                                                         # Pre-select the provider if one is given.
1659                                                         if (($used_providers{$cgiparams{'ID'}}[0] eq "$provider") || ($cgiparams{'PROVIDER'} eq "$provider")) {
1660                                                                 $selected{$provider} = "selected='selected'";
1661                                                         }
1662
1663                                                         # Add the provider to the dropdown menu.
1664                                                         print "<option value='$provider' $selected{$provider}>$provider_name</option>\n";
1665                                                 }
1666 print <<END
1667                                         </select>
1668                                 </td>
1669
1670                                 <td width='60%'>
1671                                         <b><a id="website" target="_blank" href="#">$Lang::tr{'ids visit provider website'}</a></b>
1672                                 </td>
1673                         </tr>
1674
1675                         <tr>
1676                                 <td colspan='2'><br><br></td>
1677                         </tr>
1678
1679                         <tr class='subscription_code' style='display:none' id='subscription_code'>
1680                                 <td colspan='2'>
1681                                         <table border='0'>
1682                                                 <tr>
1683                                                         <td>
1684                                                                 <b>$Lang::tr{'subscription code'}</b>
1685                                                         </td>
1686                                                 </tr>
1687
1688                                                 <tr>
1689                                                         <td>
1690                                                                 <input type='text' size='40' name='SUBSCRIPTION_CODE' value='$used_providers{$cgiparams{'ID'}}[1]'>
1691                                                         </td>
1692                                                 </tr>
1693
1694                                                 <tr>
1695                                                         <td><br><br></td>
1696                                                 </tr>
1697                                         </table>
1698                                 </td>
1699                         </tr>
1700
1701                         <tr>
1702                                 <td colspan='2'>
1703                                         <input type='checkbox' name='ENABLE_AUTOUPDATE' $checked{'ENABLE_AUTOUPDATE'}>&nbsp;$Lang::tr{'ids enable automatic updates'}
1704                                 </td>
1705                         </tr>
1706
1707                         <tr>
1708                                 <td colspan='2' align='right'>
1709                                         <input type='submit' value='$Lang::tr{'back'}'>
1710 END
1711 ;
1712                                 # Check if a provider should be added or edited.
1713                                 if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1714                                         # Display button for updating the existing provider.
1715                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'update'}'>\n";
1716                                 } else {
1717                                         # Display button to add the new provider.
1718                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'add'}'>\n";
1719                                 }
1720 print <<END
1721                                 </td>
1722                         </tr>
1723                 </table>
1724         </form>
1725 END
1726 ;
1727         &Header::closebox();
1728 }
1729
1730 #
1731 ## A function to display a notice, to lock the webpage and
1732 ## tell the user which action currently will be performed.
1733 #
1734 sub working_notice ($) {
1735         my ($message) = @_;
1736
1737         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1738         &Header::openbigbox('100%', 'left', '', $errormessage);
1739         &Header::openbox( 'Waiting', 1,);
1740                 print <<END;
1741                         <table>
1742                                 <tr>
1743                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1744                                         <td>$message</td>
1745                                 </tr>
1746                         </table>
1747 END
1748         &Header::closebox();
1749         &Header::closebigbox();
1750         &Header::closepage();
1751 }
1752
1753 #
1754 ## A tiny function to perform a reload of the webpage after one second.
1755 #
1756 sub reload () {
1757         print "<meta http-equiv='refresh' content='1'>\n";
1758
1759         # Stop the script.
1760         exit;
1761 }
1762
1763 #
1764 ## Private function to read-in and parse rules of a given rulefile.
1765 #
1766 ## The given file will be read, parsed and all valid rules will be stored by ID,
1767 ## message/description and it's state in the idsrules hash.
1768 #
1769 sub readrulesfile ($) {
1770         my $rulefile = shift;
1771
1772         # Open rule file and read in contents
1773         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1774
1775         # Store file content in an array.
1776         my @lines = <RULEFILE>;
1777
1778         # Close file.
1779         close(RULEFILE);
1780
1781         # Loop over rule file contents
1782         foreach my $line (@lines) {
1783                 # Remove whitespaces.
1784                 chomp $line;
1785
1786                 # Skip blank  lines.
1787                 next if ($line =~ /^\s*$/);
1788
1789                 # Local vars.
1790                 my $sid;
1791                 my $msg;
1792
1793                 # Gather rule sid and message from the ruleline.
1794                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1795                         $msg = $1;
1796                         $sid = $2;
1797
1798                         # Check if a rule has been found.
1799                         if ($sid && $msg) {
1800                                 # Add rule to the idsrules hash.
1801                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1802
1803                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1804                                 if ($line =~ /^\#/) {
1805                                         # If yes, the rule is disabled.
1806                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1807                                 } else {
1808                                         # Otherwise the rule is enabled.
1809                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1810                                 }
1811                         }
1812                 }
1813         }
1814 }
1815
1816 #
1817 ## Function to get the used memory of a given process-id.
1818 #
1819 sub get_memory_usage($) {
1820         my ($pid) = @_;
1821
1822         my $memory = 0;
1823
1824         # Try to open the status file for the given process-id on the pseudo
1825         # file system proc.
1826         if (open(FILE, "/proc/$pid/status")) {
1827                 # Loop through the entire file.
1828                 while (<FILE>) {
1829                         # Splitt current line content and store them into variables.
1830                         my ($key, $value) = split(":", $_, 2);
1831
1832                         # Check if the current key is the one which contains the memory usage.
1833                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1834                         # of the entire process.
1835                         if ($key eq "VmRSS") {
1836                                 # Found the memory usage add it to the memory variable.
1837                                 $memory += $value;
1838
1839                                 # Break the loop.
1840                                 last;
1841                         }
1842                 }
1843
1844                 # Close file handle.
1845                 close(FILE);
1846
1847                 # Return memory usage.
1848                 return $memory;
1849         }
1850
1851         # If the file could not be open, return nothing.
1852         return;
1853 }
1854
1855 #
1856 ## Function to read-in the given enabled or disables sids file.
1857 #
1858 sub read_enabled_disabled_sids_file($) {
1859         my ($file) = @_;
1860
1861         # Temporary hash to store the sids and their state. It will be
1862         # returned at the end of this function.
1863         my %temphash;
1864
1865         # Open the given filename.
1866         open(FILE, "$file") or die "Could not open $file. $!\n";
1867
1868         # Loop through the file.
1869         while(<FILE>) {
1870                 # Remove newlines.
1871                 chomp $_;
1872
1873                 # Skip blank lines.
1874                 next if ($_ =~ /^\s*$/);
1875
1876                 # Skip coments.
1877                 next if ($_ =~ /^\#/);
1878
1879                 # Splitt line into sid and state part.
1880                 my ($state, $sid) = split(" ", $_);
1881
1882                 # Skip line if the sid is not numeric.
1883                 next unless ($sid =~ /\d+/ );
1884
1885                 # Check if the sid was enabled.
1886                 if ($state eq "enablesid") {
1887                         # Add the sid and its state as enabled to the temporary hash.
1888                         $temphash{$sid} = "enabled";
1889                 # Check if the sid was disabled.
1890                 } elsif ($state eq "disablesid") {
1891                         # Add the sid and its state as disabled to the temporary hash.
1892                         $temphash{$sid} = "disabled";
1893                 # Invalid state - skip the current sid and state.
1894                 } else {
1895                         next;
1896                 }
1897         }
1898
1899         # Close filehandle.
1900         close(FILE);
1901
1902         # Return the hash.
1903         return %temphash;
1904 }
1905
1906 #
1907 ## Function to get the provider name from the language file or providers file for a given handle.
1908 #
1909 sub get_provider_name($) {
1910         my ($handle) = @_;
1911         my $provider_name;
1912
1913         # Get the required translation string for the given provider handle.
1914         my $tr_string = $IDS::Ruleset::Providers{$handle}{'tr_string'};
1915
1916         # Check if the translation string is available in the language files.
1917         if ($Lang::tr{$tr_string}) {
1918                 # Use the translated string from the language file.
1919                 $provider_name = $Lang::tr{$tr_string};
1920         } else {
1921                 # Fallback and use the provider summary from the providers file.
1922                 $provider_name = $IDS::Ruleset::Providers{$handle}{'summary'};
1923         }
1924
1925         # Return the obtained provider name.
1926         return $provider_name;
1927 }
1928
1929 #
1930 ## Private function to convert a given rulefile to a category name.
1931 ## ( No file extension anymore and if the name contained a dot, it
1932 ## would be replaced by a underline sign.)
1933 #
1934 sub _rulefile_to_category($) {
1935         my ($filename) = @_;
1936
1937         # Splitt the filename into single chunks and store them in a
1938         # temorary array.
1939         my @parts = split(/\./, $filename);
1940
1941         # Return / Remove last element of the temporary array.
1942         # This removes the file extension.
1943         pop @parts;
1944
1945         # Join together the single elements of the temporary array.
1946         # If these are more than one, use a "underline" for joining.
1947         my $category = join '_', @parts;
1948
1949         # Return the converted filename.
1950         return $category;
1951 }