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 use experimental 'smartmatch';
  24
  25 # enable only the following on debugging purpose
  26 #use warnings;
  27 #use CGI::Carp 'fatalsToBrowser';
  28
  29 require '/var/ipfire/general-functions.pl';
  30 require "${General::swroot}/lang.pl";
  31 require "${General::swroot}/header.pl";
  32 require "${General::swroot}/ids-functions.pl";
  33 require "${General::swroot}/network-functions.pl";
  34
  35 # Import ruleset providers file.
  36 require "$IDS::rulesetsourcesfile";
  37
  38 my %color = ();
  39 my %mainsettings = ();
  40 my %idsrules = ();
  41 my %idssettings=();
  42 my %used_providers=();
  43 my %cgiparams=();
  44 my %checked=();
  45 my %selected=();
  46 my %ignored=();
  47
  48 # Read-in main settings, for language, theme and colors.
  49 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  50 &General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
  51
  52 # Get the available network zones, based on the config type of the system and store
  53 # the list of zones in an array.
  54 my @network_zones = &Network::get_available_network_zones();
  55
  56 # Check if openvpn is started and add it to the array of network zones.
  57 if ( -e "/var/run/openvpn.pid") {
  58         push(@network_zones, "ovpn");
  59 }
  60
  61 my $errormessage;
  62
  63 # Create files if they does not exist yet.
  64 &IDS::check_and_create_filelayout();
  65
  66 # Hash which contains the colour code of a network zone.
  67 my %colourhash = (
  68         'red' => $Header::colourred,
  69         'green' => $Header::colourgreen,
  70         'blue' => $Header::colourblue,
  71         'orange' => $Header::colourorange,
  72         'ovpn' => $Header::colourovpn
  73 );
  74
  75 &Header::showhttpheaders();
  76
  77 #Get GUI values
  78 &Header::getcgihash(\%cgiparams);
  79
  80 ## Add/edit an entry to the ignore file.
  81 #
  82 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  83
  84         # Check if any input has been performed.
  85         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  86
  87                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  88                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  89                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  90                 }
  91         } else {
  92                 $errormessage = "$Lang::tr{'guardian empty input'}";
  93         }
  94
  95         # Go further if there was no error.
  96         if ($errormessage eq '') {
  97                 my %ignored = ();
  98                 my $id;
  99                 my $status;
 100
 101                 # Assign hash values.
 102                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 103                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 104
 105                 # Read-in ignoredfile.
 106                 &General::readhasharray($IDS::ignored_file, \%ignored) if (-e $IDS::ignored_file);
 107
 108                 # Check if we should edit an existing entry and got an ID.
 109                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 110                         # Assin the provided id.
 111                         $id = $cgiparams{'ID'};
 112
 113                         # Undef the given ID.
 114                         undef($cgiparams{'ID'});
 115
 116                         # Grab the configured status of the corresponding entry.
 117                         $status = $ignored{$id}[2];
 118                 } else {
 119                         # Each newly added entry automatically should be enabled.
 120                         $status = "enabled";
 121
 122                         # Generate the ID for the new entry.
 123                         #
 124                         # Sort the keys by their ID and store them in an array.
 125                         my @keys = sort { $a <=> $b } keys %ignored;
 126
 127                         # Reverse the key array.
 128                         my @reversed = reverse(@keys);
 129
 130                         # Obtain the last used id.
 131                         my $last_id = @reversed[0];
 132
 133                         # Increase the last id by one and use it as id for the new entry.
 134                         $id = ++$last_id;
 135                 }
 136
 137                 # Add/Modify the entry to/in the ignored hash.
 138                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 139
 140                 # Write the changed ignored hash to the ignored file.
 141                 &General::writehasharray($IDS::ignored_file, \%ignored);
 142
 143                 # Regenerate the ignore file.
 144                 &IDS::generate_ignore_file();
 145         }
 146
 147         # Check if the IDS is running.
 148         if(&IDS::ids_is_running()) {
 149                 # Call suricatactrl to perform a reload.
 150                 &IDS::call_suricatactrl("reload");
 151         }
 152
 153 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 154 #
 155
 156 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 157         my %ignored = ();
 158
 159         # Only go further, if an ID has been passed.
 160         if ($cgiparams{'ID'}) {
 161                 # Assign the given ID.
 162                 my $id = $cgiparams{'ID'};
 163
 164                 # Undef the given ID.
 165                 undef($cgiparams{'ID'});
 166
 167                 # Read-in ignoredfile.
 168                 &General::readhasharray($IDS::ignored_file, \%ignored) if (-e $IDS::ignored_file);
 169
 170                 # Grab the configured status of the corresponding entry.
 171                 my $status = $ignored{$id}[2];
 172
 173                 # Switch the status.
 174                 if ($status eq "disabled") {
 175                         $status = "enabled";
 176                 } else {
 177                         $status = "disabled";
 178                 }
 179
 180                 # Modify the status of the existing entry.
 181                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 182
 183                 # Write the changed ignored hash to the ignored file.
 184                 &General::writehasharray($IDS::ignored_file, \%ignored);
 185
 186                 # Regenerate the ignore file.
 187                 &IDS::generate_ignore_file();
 188
 189                 # Check if the IDS is running.
 190                 if(&IDS::ids_is_running()) {
 191                         # Call suricatactrl to perform a reload.
 192                         &IDS::call_suricatactrl("reload");
 193                 }
 194         }
 195
 196 ## Remove entry from ignore list.
 197 #
 198 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 199         my %ignored = ();
 200
 201         # Read-in ignoredfile.
 202         &General::readhasharray($IDS::ignored_file, \%ignored) if (-e $IDS::ignored_file);
 203
 204         # Drop entry from the hash.
 205         delete($ignored{$cgiparams{'ID'}});
 206
 207         # Undef the given ID.
 208         undef($cgiparams{'ID'});
 209
 210         # Write the changed ignored hash to the ignored file.
 211         &General::writehasharray($IDS::ignored_file, \%ignored);
 212
 213         # Regenerate the ignore file.
 214         &IDS::generate_ignore_file();
 215
 216         # Check if the IDS is running.
 217         if(&IDS::ids_is_running()) {
 218                 # Call suricatactrl to perform a reload.
 219                 &IDS::call_suricatactrl("reload");
 220         }
 221 }
 222
 223 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 224 if (-e $IDS::ids_page_lock_file) {
 225         # Lock the webpage and print notice about autoupgrade of the ruleset
 226         # is in progess.
 227         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 228
 229         # Loop and check if the file still exists.
 230         while(-e $IDS::ids_page_lock_file) {
 231                 # Sleep for a second and re-check.
 232                 sleep 1;
 233         }
 234
 235         # Page has been unlocked, perform a reload.
 236         &reload();
 237 }
 238
 239 # Check if any error has been stored.
 240 if (-e $IDS::storederrorfile) {
 241         # Open file to read in the stored error message.
 242         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 243
 244         # Read the stored error message.
 245         $errormessage = <FILE>;
 246
 247         # Close file.
 248         close (FILE);
 249
 250         # Delete the file, which is now not longer required.
 251         unlink($IDS::storederrorfile);
 252 }
 253
 254 # Gather ruleset details.
 255 if ($cgiparams{'RULESET'}) {
 256         ## Grab all available rules and store them in the idsrules hash.
 257         #
 258
 259         # Get enabled providers.
 260         my @enabled_providers = &IDS::get_enabled_providers();
 261
 262         # Open rules directory and do a directory listing.
 263         opendir(DIR, $IDS::rulespath) or die $!;
 264                 # Loop through the direcory.
 265                 while (my $file = readdir(DIR)) {
 266
 267                         # We only want files.
 268                         next unless (-f "$IDS::rulespath/$file");
 269
 270                         # Ignore empty files.
 271                         next if (-z "$IDS::rulespath/$file");
 272
 273                         # Use a regular expression to find files ending in .rules
 274                         next unless ($file =~ m/\.rules$/);
 275
 276                         # Ignore files which are not read-able.
 277                         next unless (-R "$IDS::rulespath/$file");
 278
 279                         # Skip whitelist rules file.
 280                         next if( $file eq "whitelist.rules");
 281
 282                         # Splitt vendor from filename.
 283                         my @filename_parts = split(/-/, $file);
 284
 285                         # Assign vendor name for easy processing.
 286                         my $vendor = @filename_parts[0];
 287
 288                         # Skip rulefile if the provider is disabled.
 289                         next unless ($vendor ~~ @enabled_providers);
 290
 291                         # Call subfunction to read-in rulefile and add rules to
 292                         # the idsrules hash.
 293                         &readrulesfile("$file");
 294                 }
 295
 296         closedir(DIR);
 297
 298         # Loop through the array of used providers.
 299         foreach my $provider (@enabled_providers) {
 300                 # Gather used rulefiles.
 301                 my @used_rulesfiles = &IDS::get_provider_used_rulesfiles($provider);
 302
 303                 # Loop through the array of used rulesfiles.
 304                 foreach my $rulefile (@used_rulesfiles) {
 305                         # Check if the current rulefile exists in the %idsrules hash.
 306                         # If not, the file probably does not exist anymore or contains
 307                         # no rules.
 308                         if($idsrules{$rulefile}) {
 309                                 # Add the rulefile state to the %idsrules hash.
 310                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 311                         }
 312                 }
 313         }
 314 }
 315
 316 # Save ruleset.
 317 if ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 318         # Get enabled providers.
 319         my @enabled_providers = &IDS::get_enabled_providers();
 320
 321         # Loop through the array of enabled providers.
 322         foreach my $provider (@enabled_providers) {
 323                 # Hash to store the used-enabled and disabled sids.
 324                 my %enabled_disabled_sids;
 325
 326                 # Hash to store the enabled rulefiles for the current processed provider.
 327                 my %used_rulefiles;
 328
 329                 # Get name of the file which holds the ruleset modification of the provider.
 330                 my $modifications_file = &IDS::get_provider_ruleset_modifications_file($provider);
 331
 332                 # Get the name of the file which contains the used rulefiles for this provider.
 333                 my $used_rulefiles_file = &IDS::get_provider_used_rulesfiles_file($provider);
 334
 335                 # Read-in modifications file, if exists.
 336                 &General::readhash("$modifications_file", \%enabled_disabled_sids) if (-f "$modifications_file");
 337
 338                 # Loop through the hash of idsrules.
 339                 foreach my $rulefile (keys %idsrules) {
 340                         # Split the rulefile to get the vendor.
 341                         my @filename_parts = split(/-/, $rulefile);
 342
 343                         # Assign rulefile vendor.
 344                         my $rulefile_vendor = @filename_parts[0];
 345
 346                         # Skip the rulefile if the vendor is not our current processed provider.
 347                         next unless ($rulefile_vendor eq $provider);
 348
 349                         # Check if the rulefile is enabled.
 350                         if ($cgiparams{$rulefile} eq "on") {
 351                                 # Add the rulefile to the hash of enabled rulefiles of this provider.
 352                                 $used_rulefiles{$rulefile} = "enabled";
 353
 354                                 # Drop item from cgiparams hash.
 355                                 delete $cgiparams{$rulefile};
 356                         }
 357
 358                         # Loop through the single rules of the rulefile.
 359                         foreach my $sid (keys %{$idsrules{$rulefile}}) {
 360                                 # Skip the current sid if it is not numeric.
 361                                 next unless ($sid =~ /\d+/ );
 362
 363                                 # Check if there exists a key in the cgiparams hash for this sid.
 364                                 if (exists($cgiparams{$sid})) {
 365                                         # Look if the rule is disabled.
 366                                         if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 367                                                 # Check if the state has been set to 'on'.
 368                                                 if ($cgiparams{$sid} eq "on") {
 369                                                         # Add/Modify the sid to/in the enabled_disabled_sids hash.
 370                                                         $enabled_disabled_sids{$sid} = "enabled";
 371
 372                                                         # Drop item from cgiparams hash.
 373                                                         delete $cgiparams{$rulefile}{$sid};
 374                                                 }
 375                                         }
 376                                 } else {
 377                                         # Look if the rule is enabled.
 378                                         if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 379                                                 # Check if the state is 'on' and should be disabled.
 380                                                 # In this case there is no entry
 381                                                 # for the sid in the cgiparams hash.
 382                                                 # Add/Modify it to/in the enabled_disabled_sids hash.
 383                                                 $enabled_disabled_sids{$sid} = "disabled";
 384
 385                                                 # Drop item from cgiparams hash.
 386                                                 delete $cgiparams{$rulefile}{$sid};
 387                                         }
 388                                 }
 389                         }
 390                 }
 391
 392                 # Check if the hash for enabled/disabled sids contains any entries.
 393                 if (%enabled_disabled_sids) {
 394                         # Write the modifications file.
 395                         &General::writehash("$modifications_file", \%enabled_disabled_sids);
 396                 }
 397
 398                 # Write the used rulefiles file.
 399                 &General::writehash("$used_rulefiles_file", \%used_rulefiles);
 400         }
 401
 402         # Call function to generate and write the used rulefiles file.
 403         &IDS::write_used_rulefiles_file(@enabled_providers);
 404
 405         # Lock the webpage and print message.
 406         &oinkmaster_web();
 407
 408         # Check if the IDS is running.
 409         if(&IDS::ids_is_running()) {
 410                 # Call suricatactrl to perform a reload.
 411                 &IDS::call_suricatactrl("reload");
 412         }
 413
 414         # Reload page.
 415         &reload();
 416
 417 # Download new ruleset.
 418 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'ids force ruleset update'}) {
 419         # Assign given provider handle.
 420         my $provider = $cgiparams{'PROVIDER'};
 421
 422         # Check if the red device is active.
 423         unless (-e "${General::swroot}/red/active") {
 424                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 425         }
 426
 427         # Check if enought free disk space is availabe.
 428         if(&IDS::checkdiskspace()) {
 429                 $errormessage = "$Lang::tr{'not enough disk space'}";
 430         }
 431
 432         # Check if any errors happend.
 433         unless ($errormessage) {
 434                 # Lock the webpage and print notice about downloading
 435                 # a new ruleset.
 436                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 437
 438                 # Call subfunction to download the ruleset.
 439                 my $return = &IDS::downloadruleset($provider);
 440
 441                 # Check if the download function gives a return code.
 442                 if ($return) {
 443                         # Handle different return codes.
 444                         if ($return eq "not modified") {
 445                                 $errormessage = "$provider - $Lang::tr{'ids ruleset is up to date'}";
 446                         } else {
 447                                 $errormessage = "$provider - $Lang::tr{'could not download latest updates'}: $return";
 448                         }
 449
 450                         # Call function to store the errormessage.
 451                         &IDS::_store_error_message($errormessage);
 452
 453                         # Preform a reload of the page.
 454                         &reload();
 455                 } else {
 456                         # Call subfunction to launch oinkmaster.
 457                         &oinkmaster_web();
 458
 459                         # Check if the IDS is running.
 460                         if(&IDS::ids_is_running()) {
 461                                 # Call suricatactrl to perform a reload.
 462                                 &IDS::call_suricatactrl("reload");
 463                         }
 464
 465                         # Perform a reload of the page.
 466                         &reload();
 467                 }
 468         }
 469
 470 # Reset a provider to it's defaults.
 471 } elsif ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'ids reset provider'}") {
 472         # Get enabled providers.
 473         my @enabled_providers = &IDS::get_enabled_providers();
 474
 475         # Grab provider handle from cgihash.
 476         my $provider = $cgiparams{'PROVIDER'};
 477
 478         # Lock the webpage and print message.
 479         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 480
 481         # Get the name of the file which contains the used rulefiles for this provider.
 482         my $used_rulefiles_file = &IDS::get_provider_used_rulesfiles_file($provider);
 483
 484         # Remove the file if it exists.
 485         unlink("$used_rulefiles_file") if (-f "$used_rulefiles_file");
 486
 487         # Call function to get the path and name for file which holds the ruleset modifications
 488         # for the given provider.
 489         my $modifications_file = &IDS::get_provider_ruleset_modifications_file($provider);
 490
 491         # Check if the file exists.
 492         if (-f $modifications_file) {
 493                 # Remove the file, as requested.
 494                 unlink("$modifications_file");
 495         }
 496
 497         # Write used rulesfiles file.
 498         &IDS::write_used_rulefiles_file(@enabled_providers);
 499
 500         # Regenerate ruleset.
 501         &oinkmaster_web();
 502
 503         # Check if the IDS is running.
 504         if(&IDS::ids_is_running()) {
 505                 # Get amount of enabled providers.
 506                 my $amount = @enabled_providers;
 507
 508                 # Check if at least one enabled provider remains.
 509                 if ($amount >= 1) {
 510                         # Call suricatactrl to perform a reload.
 511                         &IDS::call_suricatactrl("reload");
 512
 513                 # Stop suricata if no enabled provider remains.
 514                 } else {
 515                         # Call suricatactrel to perform the stop.
 516                         &IDS::call_suricatactrl("stop");
 517                 }
 518         }
 519
 520         # Undefine providers flag.
 521         undef($cgiparams{'PROVIDERS'});
 522
 523         # Reload page.
 524         &reload();
 525
 526 # Save IDS settings.
 527 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 528         my %oldidssettings;
 529         my $reload_page;
 530         my $monitored_zones = 0;
 531
 532         # Read-in current (old) IDS settings.
 533         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 534
 535         # Get enabled providers.
 536         my @enabled_providers = &IDS::get_enabled_providers();
 537
 538         # Prevent form name from been stored in conf file.
 539         delete $cgiparams{'IDS'};
 540
 541         # Check if the IDS should be enabled.
 542         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 543                 # Check if at least one provider is enabled. Otherwise abort and display an error.
 544                 unless(@enabled_providers) {
 545                         $errormessage = $Lang::tr{'ids no enabled ruleset provider'};
 546                 }
 547
 548                 # Loop through the array of available interfaces.
 549                 foreach my $zone (@network_zones) {
 550                         # Convert interface name into upper case.
 551                         my $zone_upper = uc($zone);
 552
 553                         # Check if the IDS is enabled for these interfaces.
 554                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 555                                 # Increase count.
 556                                 $monitored_zones++;
 557                         }
 558                 }
 559
 560                 # Check if at least one zone should be monitored, or show an error.
 561                 unless ($monitored_zones >= 1) {
 562                         $errormessage = $Lang::tr{'ids no network zone'};
 563                 }
 564         }
 565
 566         # Go on if there are no error messages.
 567         if (!$errormessage) {
 568                 # Store settings into settings file.
 569                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 570         }
 571
 572         # Generate file to store the home net.
 573         &IDS::generate_home_net_file();
 574
 575         # Generate file to the store the DNS servers.
 576         &IDS::generate_dns_servers_file();
 577
 578         # Generate file to store the HTTP ports.
 579         &IDS::generate_http_ports_file();
 580
 581         # Check if the IDS currently is running.
 582         if(&IDS::ids_is_running()) {
 583                 # Check if ENABLE_IDS is set to on.
 584                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 585                         # Call suricatactrl to perform a reload of suricata.
 586                         &IDS::call_suricatactrl("reload");
 587                 } else {
 588                         # Call suricatactrl to stop suricata.
 589                         &IDS::call_suricatactrl("stop");
 590                 }
 591         } else {
 592                 # Call suricatactrl to start suricata.
 593                 &IDS::call_suricatactrl("start");
 594         }
 595
 596         # Check if the page should be reloaded.
 597         if ($reload_page) {
 598                 # Perform a reload of the page.
 599                 &reload();
 600         }
 601
 602 # Toggle Enable/Disable autoupdate for a provider
 603 } elsif ($cgiparams{'AUTOUPDATE'} eq $Lang::tr{'toggle enable disable'}) {
 604         my %used_providers = ();
 605
 606         # Only go further, if an ID has been passed.
 607         if ($cgiparams{'ID'}) {
 608                 # Assign the given ID.
 609                 my $id = $cgiparams{'ID'};
 610
 611                 # Undef the given ID.
 612                 undef($cgiparams{'ID'});
 613
 614                 # Read-in providers settings file.
 615                 &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 616
 617                 # Grab the configured status of the corresponding entry.
 618                 my $status_autoupdate = $used_providers{$id}[2];
 619
 620                 # Switch the status.
 621                 if ($status_autoupdate eq "disabled") {
 622                         $status_autoupdate = "enabled";
 623                 } else {
 624                         $status_autoupdate = "disabled";
 625                 }
 626
 627                 # Modify the status of the existing entry.
 628                 $used_providers{$id} = ["$used_providers{$id}[0]", "$used_providers{$id}[1]", "$status_autoupdate", "$used_providers{$id}[3]", "$used_providers{$id}[4]"];
 629
 630                 # Write the changed hash to the providers settings file.
 631                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 632         }
 633
 634 # Add/Edit a provider to the list of used providers.
 635 #
 636 } elsif (($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'update'}")) {
 637         my %used_providers = ();
 638
 639         # Read-in providers settings file.
 640         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 641
 642         # Assign some nice human-readable values.
 643         my $provider = $cgiparams{'PROVIDER'};
 644         my $subscription_code = $cgiparams{'SUBSCRIPTION_CODE'};
 645         my $status_autoupdate;
 646         my $mode;
 647         my $regenerate_ruleset_required;
 648
 649         # Handle autoupdate checkbox.
 650         if ($cgiparams{'ENABLE_AUTOUPDATE'} eq "on") {
 651                 $status_autoupdate = "enabled";
 652         } else {
 653                 $status_autoupdate = "disabled";
 654         }
 655
 656         # Handle monitor traffic only checkbox.
 657         if ($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq "on") {
 658                 $mode = "IDS";
 659         } else {
 660                 $mode = "IPS";
 661         }
 662
 663         # Check if we are going to add a new provider.
 664         if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") {
 665                 # Loop through the hash of used providers.
 666                 foreach my $id ( keys %used_providers) {
 667                         # Check if the choosen provider is already in use.
 668                         if ($used_providers{$id}[0] eq "$provider") {
 669                                 # Assign error message.
 670                                 $errormessage = "$Lang::tr{'ids the choosen provider is already in use'}";
 671                         }
 672                 }
 673         }
 674
 675         # Check if the provider requires a subscription code.
 676         if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
 677                 # Check if an subscription code has been provided.
 678                 if ($subscription_code) {
 679                         # Check if the code contains unallowed chars.
 680                         unless ($subscription_code =~ /^[a-z0-9]+$/) {
 681                                 $errormessage = $Lang::tr{'invalid input for subscription code'};
 682                         }
 683                 } else {
 684                         # Print an error message, that an subsription code is required for this
 685                         # provider.
 686                         $errormessage = $Lang::tr{'ids subscription code required'};
 687                 }
 688         }
 689
 690         # Go further if there was no error.
 691         if ($errormessage eq '') {
 692                 my $id;
 693                 my $status;
 694
 695                 # Check if we should edit an existing entry and got an ID.
 696                 if (($cgiparams{'PROVIDERS'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 697                         # Assin the provided id.
 698                         $id = $cgiparams{'ID'};
 699
 700                         # Undef the given ID.
 701                         undef($cgiparams{'ID'});
 702
 703                         # Grab the configured mode.
 704                         my $stored_mode = $used_providers{$id}[4];
 705
 706                         # Check if the ruleset action (mode) has been changed.
 707                         if ($stored_mode ne $mode) {
 708                                 # It has been changed, so the ruleset needs to be regenerated.
 709                                 $regenerate_ruleset_required = "1";
 710                         }
 711
 712                         # Grab the configured status of the corresponding entry.
 713                         $status = $used_providers{$id}[3];
 714                 } else {
 715                         # Each newly added entry automatically should be enabled.
 716                         $status = "enabled";
 717
 718                         # Generate the ID for the new entry.
 719                         #
 720                         # Sort the keys by their ID and store them in an array.
 721                         my @keys = sort { $a <=> $b } keys %used_providers;
 722
 723                         # Reverse the key array.
 724                         my @reversed = reverse(@keys);
 725
 726                         # Obtain the last used id.
 727                         my $last_id = @reversed[0];
 728
 729                         # Increase the last id by one and use it as id for the new entry.
 730                         $id = ++$last_id;
 731                 }
 732
 733                 # Add/Modify the entry to/in the used providers hash..
 734                 $used_providers{$id} = ["$provider", "$subscription_code", "$status_autoupdate", "$status", "$mode"];
 735
 736                 # Write the changed hash to the providers settings file.
 737                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 738
 739                 # Check if a new provider will be added.
 740                 if ($cgiparams{'PROVIDERS'} eq $Lang::tr{'add'}) {
 741                         # Check if the red device is active.
 742                         unless (-e "${General::swroot}/red/active") {
 743                                 $errormessage = "$Lang::tr{'ids could not add provider'} - $Lang::tr{'system is offline'}";
 744                         }
 745
 746                         # Check if enough free disk space is availabe.
 747                         if(&IDS::checkdiskspace()) {
 748                                 $errormessage = "$Lang::tr{'ids could not add provider'} - $Lang::tr{'not enough disk space'}";
 749                         }
 750
 751                         # Check if any errors happend.
 752                         unless ($errormessage) {
 753                                 # Lock the webpage and print notice about downloading
 754                                 # a new ruleset.
 755                                 &working_notice("$Lang::tr{'ids working'}");
 756
 757                                 # Download the ruleset.
 758                                 if(&IDS::downloadruleset($provider)) {
 759                                         $errormessage = "$Lang::tr{'ids could not add provider'} - $Lang::tr{'ids unable to download the ruleset'}";
 760
 761                                         # Call function to store the errormessage.
 762                                         &IDS::_store_error_message($errormessage);
 763
 764                                         # Remove the configured provider again.
 765                                         &remove_provider($id);
 766                                 } else {
 767                                         # Extract the ruleset
 768                                         &IDS::extractruleset($provider);
 769
 770                                         # Move the ruleset.
 771                                         &IDS::move_tmp_ruleset();
 772
 773                                         # Cleanup temporary directory.
 774                                         &IDS::cleanup_tmp_directory();
 775                                 }
 776
 777                                 # Perform a reload of the page.
 778                                 &reload();
 779                         } else {
 780                                 # Remove the configured provider again.
 781                                 &remove_provider($id);
 782                         }
 783                 }
 784
 785                 # Check if the ruleset has to be regenerated.
 786                 if ($regenerate_ruleset_required) {
 787                         # Call oinkmaster web function.
 788                         &oinkmaster_web();
 789
 790                         # Perform a reload of the page.
 791                         &reload();
 792                 }
 793         }
 794
 795         # Undefine providers flag.
 796         undef($cgiparams{'PROVIDERS'});
 797
 798 ## Toggle Enabled/Disabled for an existing provider.
 799 #
 800 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'toggle enable disable'}) {
 801         my %used_providers = ();
 802         my $provider_includes_action;
 803
 804         # Value if oinkmaster has to be executed.
 805         my $oinkmaster = "False";
 806
 807         # Only go further, if an ID has been passed.
 808         if ($cgiparams{'ID'}) {
 809                 # Assign the given ID.
 810                 my $id = $cgiparams{'ID'};
 811
 812                 # Undef the given ID.
 813                 undef($cgiparams{'ID'});
 814
 815                 # Read-in file which contains the provider settings.
 816                 &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 817
 818                 # Grab the configured status of the corresponding entry.
 819                 my $status = $used_providers{$id}[3];
 820
 821                 # Grab the provider handle.
 822                 my $provider_handle = $used_providers{$id}[0];
 823
 824                 # Switch the status.
 825                 if ($status eq "enabled") {
 826                         $status = "disabled";
 827
 828                         # Set the provider includes action to "remove" for removing the entry.
 829                         $provider_includes_action = "remove";
 830                 } else {
 831                         $status = "enabled";
 832
 833                         # Set the provider includes action to "add".
 834                         $provider_includes_action = "add";
 835
 836                         # This operation requires to launch oinkmaster.
 837                         $oinkmaster = "True";
 838                 }
 839
 840                 # Modify the status of the existing entry.
 841                 $used_providers{$id} = ["$used_providers{$id}[0]", "$used_providers{$id}[1]", "$used_providers{$id}[2]", "$status", "$used_providers{$id}[4]"];
 842
 843                 # Write the changed hash to the providers settings file.
 844                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 845
 846                 # Get all enabled providers.
 847                 my @enabled_providers = &IDS::get_enabled_providers();
 848
 849                 # Write the main providers include file.
 850                 &IDS::write_used_rulefiles_file(@enabled_providers);
 851
 852                 # Check if oinkmaster has to be executed.
 853                 if ($oinkmaster eq "True") {
 854                         # Launch oinkmaster.
 855                         &oinkmaster_web();
 856                 }
 857
 858                 # Check if the IDS is running.
 859                 if(&IDS::ids_is_running()) {
 860                         # Gather the amount of enabled providers (elements in the array).
 861                         my $amount = @enabled_providers;
 862
 863                         # Check if there are still enabled ruleset providers.
 864                         if ($amount >= 1) {
 865                                 # Call suricatactrl to perform a restart.
 866                                 &IDS::call_suricatactrl("restart");
 867
 868                         # No active ruleset provider, suricata has to be stopped.
 869                         } else {
 870                                 # Stop suricata.
 871                                 &IDS::call_suricatactrl("stop");
 872                         }
 873                 }
 874
 875                 # Undefine providers flag.
 876                 undef($cgiparams{'PROVIDERS'});
 877
 878                 # Reload page.
 879                 &reload();
 880         }
 881
 882 ## Remove provider from the list of used providers.
 883 #
 884 } elsif ($cgiparams{'PROVIDERS'} eq $Lang::tr{'remove'}) {
 885         # Assign a nice human-readable variable.
 886         my $id = $cgiparams{'ID'};
 887
 888         # Grab the provider name bevore deleting.
 889         my $provider = &get_provider_handle($id);
 890
 891         # Remove the provider.
 892         &remove_provider($id);
 893
 894         # Undef the given ID.
 895         undef($cgiparams{'ID'});
 896
 897         # Drop the stored ruleset file.
 898         &IDS::drop_dl_rulesfile($provider);
 899
 900         # Get the name of the provider rulessets include file.
 901         my $provider_used_rulefile = &IDS::get_provider_used_rulesfiles_file($provider);
 902
 903         # Drop the file, it is not longer needed.
 904         unlink("$provider_used_rulefile");
 905
 906         # Call function to get the path and name for the given providers
 907         # ruleset modifications file..
 908         my $modifications_file = &IDS::get_provider_ruleset_modifications_file($provider);
 909
 910         # Check if the file exists.
 911         if (-f $modifications_file) {
 912                 # Remove the file, which is not longer needed.
 913                 unlink("$modifications_file");
 914         }
 915
 916         # Regenerate ruleset.
 917         &oinkmaster_web();
 918
 919         # Gather all enabled providers.
 920         my @enabled_providers = &IDS::get_enabled_providers();
 921
 922         # Regenerate main providers include file.
 923         &IDS::write_used_rulefiles_file(@enabled_providers);
 924
 925         # Check if the IDS is running.
 926         if(&IDS::ids_is_running()) {
 927                 # Get amount of enabled providers.
 928                 my $amount = @enabled_providers;
 929
 930                 # Check if at least one enabled provider remains.
 931                 if ($amount >= 1) {
 932                         # Call suricatactrl to perform a reload.
 933                         &IDS::call_suricatactrl("restart");
 934
 935                 # Stop suricata if no enabled provider remains.
 936                 } else {
 937                         # Call suricatactrel to perform the stop.
 938                         &IDS::call_suricatactrl("stop");
 939                 }
 940         }
 941
 942         # Undefine providers flag.
 943         undef($cgiparams{'PROVIDERS'});
 944
 945         # Reload page.
 946         &reload();
 947 }
 948
 949 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 950
 951 &Header::openbigbox('100%', 'left', '', $errormessage);
 952
 953 &show_display_error_message();
 954
 955 if ($cgiparams{'RULESET'} eq "$Lang::tr{'ids customize ruleset'}" ) {
 956         &show_customize_ruleset();
 957 } elsif ($cgiparams{'PROVIDERS'} ne "") {
 958         &show_add_provider();
 959 } else {
 960         &show_mainpage();
 961 }
 962
 963 &Header::closebigbox();
 964 &Header::closepage();
 965
 966 #
 967 ## Tiny function to show if a error message happened.
 968 #
 969 sub show_display_error_message() {
 970         if ($errormessage) {
 971                 &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 972                         print "<class name='base'>$errormessage\n";
 973                         print "&nbsp;</class>\n";
 974                 &Header::closebox();
 975         }
 976 }
 977
 978 #
 979 ## Function to display the main IDS page.
 980 #
 981 sub show_mainpage() {
 982         # Read-in idssettings and provider settings.
 983         &General::readhash("$IDS::ids_settings_file", \%idssettings);
 984         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 985
 986         # Read-in ignored hosts.
 987         &General::readhasharray("$IDS::ignored_file", \%ignored) if (-e $IDS::ignored_file);
 988
 989         $checked{'ENABLE_IDS'}{'off'} = '';
 990         $checked{'ENABLE_IDS'}{'on'} = '';
 991         $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 992
 993         # Draw current state of the IDS
 994         &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 995
 996         # Check if the IDS is running and obtain the process-id.
 997         my $pid = &IDS::ids_is_running();
 998
 999         # Display some useful information, if suricata daemon is running.
1000         if ($pid) {
1001                 # Gather used memory.
1002                 my $memory = &get_memory_usage($pid);
1003
1004                 print <<END;
1005                         <table width='95%' cellspacing='0' class='tbl'>
1006                                 <tr>
1007                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
1008                                 </tr>
1009
1010                                 <tr>
1011                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
1012                                         <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
1013                                 </tr>
1014
1015                                 <tr>
1016                                         <td class='base'></td>
1017                                         <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
1018                                         <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
1019                                 </tr>
1020
1021                                 <tr>
1022                                         <td class='base'></td>
1023                                         <td bgcolor='$color{'color22'}' align='center'>$pid</td>
1024                                         <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
1025                                 </tr>
1026                         </table>
1027 END
1028         } else {
1029                 # Otherwise display a hint that the service is not launched.
1030                 print <<END;
1031                         <table width='95%' cellspacing='0' class='tbl'>
1032                                 <tr>
1033                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
1034                                 </tr>
1035
1036                                 <tr>
1037                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
1038                                         <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
1039                                 </tr>
1040                         </table>
1041 END
1042         }
1043
1044         # Only show this area, if at least one ruleset provider is configured.
1045         if (%used_providers) {
1046
1047 print <<END
1048
1049                 <br><br><h2>$Lang::tr{'settings'}</h2>
1050
1051                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1052                         <table width='100%' border='0'>
1053                                 <tr>
1054                                         <td class='base' colspan='2'>
1055                                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
1056                                         </td>
1057
1058                                 </td>
1059                                 </tr>
1060
1061                                 <tr>
1062                                         <td><br><br></td>
1063                                         <td><br><br></td>
1064                                         <td><br><br></td>
1065                                         <td><br><br></td>
1066                                 </tr>
1067
1068                                 <tr>
1069                                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
1070                                 </tr>
1071
1072                                 <tr>
1073 END
1074 ;
1075
1076                 # Loop through the array of available networks and print config options.
1077                 foreach my $zone (@network_zones) {
1078                         my $checked_input;
1079                         my $checked_forward;
1080
1081                         # Convert current zone name to upper case.
1082                         my $zone_upper = uc($zone);
1083
1084                         # Set zone name.
1085                         my $zone_name = $zone;
1086
1087                         # Dirty hack to get the correct language string for the red zone.
1088                         if ($zone eq "red") {
1089                                 $zone_name = "red1";
1090                         }
1091
1092                         # Grab checkbox status from settings hash.
1093                         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
1094                                 $checked_input = "checked = 'checked'";
1095                         }
1096
1097                         print "<td class='base' width='20%'>\n";
1098                         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
1099                         print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
1100                         print "</td>\n";
1101                 }
1102
1103 print <<END
1104                                 </tr>
1105
1106                                 <tr>
1107                                         <td><br><br></td>
1108                                         <td><br><br></td>
1109                                         <td><br><br></td>
1110                                         <td><br><br></td>
1111                                 </tr>
1112
1113                                 <tr>
1114                                         <td colspan='4'><b>$Lang::tr{'ids automatic rules update'}</b></td>
1115                                 </tr>
1116                         </table>
1117
1118                         <br><br>
1119
1120                         <table width='100%'>
1121                                 <tr>
1122                                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
1123                                 </tr>
1124                         </table>
1125                 </form>
1126 END
1127 ;
1128
1129         }
1130
1131         &Header::closebox();
1132
1133         #
1134         # Used Ruleset Providers section.
1135         #
1136         &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
1137
1138 print <<END;
1139         <table width='100%' border='0'>
1140                 <tr>
1141                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ids provider'}</b></td>
1142                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'date'}</b></td>
1143                         <td class='base' bgcolor='$color{'color20'}' align='center'><b>$Lang::tr{'ids autoupdates'}</b></td>
1144                         <td class='base' bgcolor='$color{'color20'}' align='center'><b>$Lang::tr{'action'}</b></td>
1145                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1146                 </tr>
1147 END
1148                 my $line = 1;
1149
1150                 # Check if some providers has been configured.
1151                 if (keys (%used_providers)) {
1152                         my $col = "";
1153
1154                         # Loop through all entries of the hash.
1155                         foreach my $id (sort keys(%used_providers)) {
1156                                 # Assign data array positions to some nice variable names.
1157                                 my $provider = $used_providers{$id}[0];
1158                                 my $provider_name = &get_provider_name($provider);
1159                                 my $rulesetdate = &IDS::get_ruleset_date($provider);
1160
1161                                 my $subscription_code = $used_providers{$id}[1];
1162                                 my $autoupdate_status = $used_providers{$id}[2];
1163                                 my $status  = $used_providers{$id}[3];
1164
1165                                 # Check if the item number is even or not.
1166                                 if ($line % 2) {
1167                                         $col="bgcolor='$color{'color22'}'";
1168                                 } else {
1169                                         $col="bgcolor='$color{'color20'}'";
1170                                 }
1171
1172                                 # Choose icons for the checkboxes.
1173                                 my $status_gif;
1174                                 my $status_gdesc;
1175                                 my $autoupdate_status_gif;
1176                                 my $autoupdate_status_gdesc;
1177
1178                                 # Check if the status is enabled and select the correct image and description.
1179                                 if ($status eq 'enabled' ) {
1180                                         $status_gif = 'on.gif';
1181                                         $status_gdesc = $Lang::tr{'click to disable'};
1182                                 } else {
1183                                         $status_gif = 'off.gif';
1184                                         $status_gdesc = $Lang::tr{'click to enable'};
1185                                 }
1186
1187                                 # Check if the autoupdate status is enabled and select the correct image and description.
1188                                 if ($autoupdate_status eq 'enabled') {
1189                                         $autoupdate_status_gif = 'on.gif';
1190                                         $autoupdate_status_gdesc = $Lang::tr{'click to disable'};
1191                                 } else {
1192                                         $autoupdate_status_gif = 'off.gif';
1193                                         $autoupdate_status_gdesc = $Lang::tr{'click to enable'};
1194                                 }
1195
1196 print <<END;
1197                                 <tr>
1198                                         <td width='33%' class='base' $col>$provider_name</td>
1199                                         <td width='30%' class='base' $col>$rulesetdate</td>
1200
1201                                         <td align='center' $col>
1202                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1203                                                         <input type='hidden' name='AUTOUPDATE' value='$Lang::tr{'toggle enable disable'}' />
1204                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$autoupdate_status_gif' alt='$autoupdate_status_gdesc' title='$autoupdate_status_gdesc' />
1205                                                         <input type='hidden' name='ID' value='$id' />
1206                                                 </form>
1207                                         </td>
1208
1209                                         <td align='center' $col>
1210                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1211                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'toggle enable disable'}'>
1212                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$status_gif' alt='$status_gdesc' title='$status_gdesc'>
1213                                                         <input type='hidden' name='ID' value='$id'>
1214                                                 </form>
1215                                         </td>
1216
1217                                         <td align='center' $col>
1218                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1219                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'edit'}'>
1220                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1221                                                         <input type='hidden' name='ID' value='$id'>
1222                                                 </form>
1223                                         </td>
1224
1225                                         <td align='center' $col>
1226                                                 <form method='post' name='$provider' action='$ENV{'SCRIPT_NAME'}'>
1227                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1228                                                         <input type='hidden' name='ID' value='$id'>
1229                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'remove'}'>
1230                                                 </form>
1231                                         </td>
1232                                 </tr>
1233 END
1234                         # Increment lines value.
1235                         $line++;
1236
1237                         }
1238
1239                 } else {
1240                         # Print notice that currently no hosts are ignored.
1241                         print "<tr>\n";
1242                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1243                         print "</tr>\n";
1244                 }
1245
1246         print "</table>\n";
1247
1248         # Section to add new elements or edit existing ones.
1249 print <<END;
1250         <br>
1251         <hr>
1252         <br>
1253
1254         <div align='right'>
1255                 <table width='100%'>
1256                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1257                                 <tr>
1258 END
1259
1260                                         # Only show this button if a ruleset provider is configured.
1261                                         if (%used_providers) {
1262                                                 print "<input type='submit' name='RULESET' value='$Lang::tr{'ids customize ruleset'}'>\n";
1263                                         }
1264 print <<END;
1265                                         <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids add provider'}'>
1266                                 </tr>
1267                         </form>
1268                 </table>
1269         </div>
1270 END
1271
1272         &Header::closebox();
1273
1274         #
1275         # Whitelist / Ignorelist
1276         #
1277         &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
1278
1279         print <<END;
1280         <table width='100%'>
1281                 <tr>
1282                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
1283                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
1284                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1285                 </tr>
1286 END
1287                 # Check if some hosts have been added to be ignored.
1288                 if (keys (%ignored)) {
1289                         my $col = "";
1290
1291                         # Loop through all entries of the hash.
1292                         while( (my $key) = each %ignored)  {
1293                                 # Assign data array positions to some nice variable names.
1294                                 my $address = $ignored{$key}[0];
1295                                 my $remark = $ignored{$key}[1];
1296                                 my $status  = $ignored{$key}[2];
1297
1298                                 # Check if the key (id) number is even or not.
1299                                 if ($cgiparams{'ID'} eq $key) {
1300                                         $col="bgcolor='${Header::colouryellow}'";
1301                                 } elsif ($key % 2) {
1302                                         $col="bgcolor='$color{'color22'}'";
1303                                 } else {
1304                                         $col="bgcolor='$color{'color20'}'";
1305                                 }
1306
1307                                 # Choose icon for the checkbox.
1308                                 my $gif;
1309                                 my $gdesc;
1310
1311                                 # Check if the status is enabled and select the correct image and description.
1312                                 if ($status eq 'enabled' ) {
1313                                         $gif = 'on.gif';
1314                                         $gdesc = $Lang::tr{'click to disable'};
1315                                 } else {
1316                                         $gif = 'off.gif';
1317                                         $gdesc = $Lang::tr{'click to enable'};
1318                                 }
1319
1320 print <<END;
1321                                 <tr>
1322                                         <td width='20%' class='base' $col>$address</td>
1323                                         <td width='65%' class='base' $col>$remark</td>
1324
1325                                         <td align='center' $col>
1326                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1327                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}'>
1328                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc'>
1329                                                         <input type='hidden' name='ID' value='$key'>
1330                                                 </form>
1331                                         </td>
1332
1333                                         <td align='center' $col>
1334                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1335                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}'>
1336                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1337                                                         <input type='hidden' name='ID' value='$key'>
1338                                                 </form>
1339                                         </td>
1340
1341                                         <td align='center' $col>
1342                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1343                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1344                                                         <input type='hidden' name='ID' value='$key'>
1345                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1346                                                 </form>
1347                                                 </td>
1348                                         </tr>
1349 END
1350                                 }
1351                         } else {
1352                                 # Print notice that currently no hosts are ignored.
1353                                 print "<tr>\n";
1354                                 print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1355                                 print "</tr>\n";
1356                         }
1357
1358                 print "</table>\n";
1359
1360                 # Section to add new elements or edit existing ones.
1361 print <<END;
1362                 <br>
1363                 <hr>
1364                 <br>
1365
1366                 <div align='center'>
1367                         <table width='100%'>
1368 END
1369
1370                 # Assign correct headline and button text.
1371                 my $buttontext;
1372                 my $entry_address;
1373                 my $entry_remark;
1374
1375                 # Check if an ID (key) has been given, in this case an existing entry should be edited.
1376                 if ($cgiparams{'ID'} ne '') {
1377                         $buttontext = $Lang::tr{'update'};
1378                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1379
1380                                 # Grab address and remark for the given key.
1381                                 $entry_address = $ignored{$cgiparams{'ID'}}[0];
1382                                 $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1383                         } else {
1384                                 $buttontext = $Lang::tr{'add'};
1385                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1386                         }
1387
1388 print <<END;
1389                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1390                                 <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1391                                 <tr>
1392                                         <td width='30%'>$Lang::tr{'ip address'}: </td>
1393                                         <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1394
1395                                         <td width='30%'>$Lang::tr{'remark'}: </td>
1396                                         <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1397                                         <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1398                                 </tr>
1399                                 </form>
1400                         </table>
1401                 </div>
1402 END
1403
1404         &Header::closebox();
1405 }
1406
1407 #
1408 ## Function to show the customize ruleset section.
1409 #
1410 sub show_customize_ruleset() {
1411         ### Java Script ###
1412         print"<script>\n";
1413
1414         # Java script variable declaration for show and hide.
1415         print"var show = \"$Lang::tr{'ids show'}\"\;\n";
1416         print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
1417
1418 print <<END
1419         // Tiny javascript function to show/hide the rules
1420         // of a given category.
1421         function showhide(tblname) {
1422                 \$("#" + tblname).toggle();
1423
1424                 // Get current content of the span element.
1425                 var content = document.getElementById("span_" + tblname);
1426
1427                 if (content.innerHTML === show) {
1428                         content.innerHTML = hide;
1429                 } else {
1430                         content.innerHTML = show;
1431                 }
1432         }
1433         </script>
1434 END
1435 ;
1436         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'}" );
1437         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1438
1439         # Output display table for rule files
1440         print "<table width='100%'>\n";
1441
1442         # Loop over each rule file
1443         foreach my $rulefile (sort keys(%idsrules)) {
1444                 my $rulechecked = '';
1445
1446                 # Check if rule file is enabled
1447                 if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1448                         $rulechecked = 'CHECKED';
1449                 }
1450
1451                 # Convert rulefile name into category name.
1452                 my $categoryname = &_rulefile_to_category($rulefile);
1453
1454                 # Table and rows for the rule files.
1455                 print"<tr>\n";
1456                 print"<td class='base' width='5%'>\n";
1457                 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1458                 print"</td>\n";
1459                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1460                 print"<td class='base' width='5%' align='right'>\n";
1461                 print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1462                 print"</td>\n";
1463                 print"</tr>\n";
1464
1465                 # Rows which will be hidden per default and will contain the single rules.
1466                 print"<tr  style='display:none' id='$categoryname'>\n";
1467                 print"<td colspan='3'>\n";
1468
1469                 # Local vars
1470                 my $lines;
1471                 my $rows;
1472                 my $col;
1473
1474                 # New table for the single rules.
1475                 print "<table width='100%'>\n";
1476
1477                 # Loop over rule file rules
1478                 foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1479                         # Local vars
1480                         my $ruledefchecked = '';
1481
1482                         # Skip rulefile itself.
1483                         next if ($sid eq "Rulefile");
1484
1485                         # If 2 rules have been displayed, start a new row
1486                         if (($lines % 2) == 0) {
1487                                 print "</tr><tr>\n";
1488
1489                                 # Increase rows by once.
1490                                 $rows++;
1491                         }
1492
1493                         # Colour lines.
1494                         if ($rows % 2) {
1495                                 $col="bgcolor='$color{'color20'}'";
1496                         } else {
1497                                 $col="bgcolor='$color{'color22'}'";
1498                         }
1499
1500                         # Set rule state
1501                         if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1502                                 $ruledefchecked = 'CHECKED';
1503                         }
1504
1505                         # Create rule checkbox and display rule description
1506                         print "<td class='base' width='5%' align='right' $col>\n";
1507                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1508                         print "</td>\n";
1509                         print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1510
1511                         # Increment rule count
1512                         $lines++;
1513                 }
1514
1515                 # If do not have a second rule for row, create empty cell
1516                 if (($lines % 2) != 0) {
1517                         print "<td class='base'></td>";
1518                 }
1519
1520                 # Close display table
1521                 print "</tr></table></td></tr>";
1522         }
1523
1524         # Close display table
1525         print "</table>";
1526
1527         print <<END
1528 <table width='100%'>
1529 <tr>
1530         <td width='100%' align='right'>
1531                 <input type='submit' value='$Lang::tr{'fwhost back'}'>
1532                 <input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'>
1533         </td>
1534 </tr>
1535 </table>
1536 </form>
1537 END
1538 ;
1539         &Header::closebox();
1540 }
1541
1542 #
1543 ## Function to show section for add/edit a provider.
1544 #
1545 sub show_add_provider() {
1546         my %used_providers = ();
1547         my @subscription_providers;
1548
1549         # Read -in providers settings file.
1550         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
1551
1552         # Get all supported ruleset providers.
1553         my @ruleset_providers = &IDS::get_ruleset_providers();
1554
1555         ### Java Script ###
1556         print "<script>\n";
1557
1558         # Generate Java Script Object which contains the URL of the providers.
1559         print "\t// Object, which contains the webpages of the ruleset providers.\n";
1560         print "\tvar url = {\n";
1561
1562         # Loop through the array of supported providers.
1563         foreach my $provider (@ruleset_providers) {
1564                 # Check if the provider requires a subscription.
1565                 if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
1566                         # Add the provider to the array of subscription_providers.
1567                         push(@subscription_providers, $provider);
1568                 }
1569
1570                 # Grab the URL for the provider.
1571                 my $url = $IDS::Ruleset::Providers{$provider}{'website'};
1572
1573                 # Print the URL to the Java Script Object.
1574                 print "\t\t$provider: \"$url\"\,\n";
1575         }
1576
1577         # Close the Java Script Object declaration.
1578         print "\t}\;\n\n";
1579
1580         # Generate Java Script Array which contains the provider that requires a subscription.
1581         my $line = "";
1582         $line = join("', '", @subscription_providers);
1583
1584         print "\t// Array which contains the providers that requires a subscription.\n";
1585         print "\tsubscription_provider = ['$line']\;\n\n";
1586
1587 print <<END
1588         // Java Script function to swap the text input field for
1589         // entering a subscription code.
1590         var update_provider = function() {
1591                 if(inArray(\$('#PROVIDER').val(), subscription_provider)) {
1592                         \$('.subscription_code').show();
1593                 } else {
1594                         \$('.subscription_code').hide();
1595                 }
1596
1597                 // Call function to change the website url.
1598                 change_url(\$('#PROVIDER').val());
1599         };
1600
1601         // Java Script function to check if a given value is part of
1602         // an array.
1603         function inArray(value,array) {
1604                 var count=array.length;
1605
1606                 for(var i=0;i<count;i++) {
1607                         if(array[i]===value){
1608                                 return true;
1609                         }
1610                 }
1611
1612                 return false;
1613         }
1614
1615         // Tiny function to change the website url based on the selected element in the "PROVIDERS"
1616         // dropdown menu.
1617         function change_url(provider) {
1618                 // Get and change the href to the corresponding url.
1619                 document.getElementById("website").href = url[provider];
1620         }
1621
1622         // JQuery function to call corresponding function when
1623         // the ruleset provider is changed or the page is loaded for showing/hiding
1624         // the subscription_code area.
1625         \$(document).ready(function() {
1626                 \$('#PROVIDER').change(update_provider);
1627                         update_provider();
1628         });
1629
1630         </script>
1631 END
1632 ;
1633
1634         # Check if an existing provider should be edited.
1635         if($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1636                 # Check if autoupdate is enabled for this provider.
1637                 if ($used_providers{$cgiparams{'ID'}}[2] eq "enabled") {
1638                         # Set the checkbox to be checked.
1639                         $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1640                 }
1641
1642                 # Check if the monitor traffic only mode is set for this provider.
1643                 if ($used_providers{$cgiparams{'ID'}}[4] eq "IDS") {
1644                         # Set the checkbox to be checked.
1645                         $checked{'MONITOR_TRAFFIC_ONLY'} = "checked='checked'";
1646                 }
1647
1648                 # Display section to force an rules update and to reset the provider.
1649                 &show_additional_provider_actions();
1650
1651         } elsif ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'ids add provider'}") {
1652                 # Set the autoupdate to true as default.
1653                 $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1654         }
1655
1656         &Header::openbox('100%', 'center', $Lang::tr{'ids provider settings'});
1657
1658 print <<END
1659         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1660                 <table width='100%' border='0'>
1661                         <tr>
1662                                 <td colspan='2'><b>$Lang::tr{'ids provider'}</b></td>
1663                         </tr>
1664
1665                         <tr>
1666                                 <td width='40%'>
1667                                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1668 END
1669 ;
1670                                         # Value to allow disabling the dropdown menu.
1671                                         my $disabled;
1672
1673                                         # Check if we are in edit mode.
1674                                         if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1675                                                 $disabled = "disabled";
1676
1677                                                 # Add hidden input with the provider because the disable select does not provider
1678                                                 # this.
1679                                                 print "<input type='hidden' name='PROVIDER' value='$used_providers{$cgiparams{'ID'}}[0]'>\n";
1680                                         }
1681
1682                                         print "<select name='PROVIDER' id='PROVIDER' $disabled>\n";
1683                                                 # Temporary hash to store the provier names and their handles.
1684                                                 my %tmphash = ();
1685
1686                                                 # Loop through the array of ruleset providers.
1687                                                 foreach my $handle (@ruleset_providers) {
1688                                                         # Get the provider name.
1689                                                         my $name = &get_provider_name($handle);
1690
1691                                                         # Add the grabbed provider  name and handle to the
1692                                                         # temporary hash.
1693                                                         $tmphash{$name} = "$handle";
1694                                                 }
1695
1696                                                 # Sort and loop through the temporary hash.
1697                                                 foreach my $provider_name ( sort keys %tmphash ) {
1698                                                         # Grab the provider handle.
1699                                                         my $provider = $tmphash{$provider_name};
1700
1701                                                         # Pre-select the provider if one is given.
1702                                                         if (($used_providers{$cgiparams{'ID'}}[0] eq "$provider") || ($cgiparams{'PROVIDER'} eq "$provider")) {
1703                                                                 $selected{$provider} = "selected='selected'";
1704                                                         }
1705
1706                                                         # Add the provider to the dropdown menu.
1707                                                         print "<option value='$provider' $selected{$provider}>$provider_name</option>\n";
1708                                                 }
1709 print <<END
1710                                         </select>
1711                                 </td>
1712
1713                                 <td width='60%'>
1714                                         <b><a id="website" target="_blank" href="#">$Lang::tr{'ids visit provider website'}</a></b>
1715                                 </td>
1716                         </tr>
1717
1718                         <tr>
1719                                 <td colspan='2'><br><br></td>
1720                         </tr>
1721
1722                         <tr class='subscription_code' style='display:none' id='subscription_code'>
1723                                 <td colspan='2'>
1724                                         <table border='0'>
1725                                                 <tr>
1726                                                         <td>
1727                                                                 <b>$Lang::tr{'subscription code'}</b>
1728                                                         </td>
1729                                                 </tr>
1730
1731                                                 <tr>
1732                                                         <td>
1733                                                                 <input type='text' size='40' name='SUBSCRIPTION_CODE' value='$used_providers{$cgiparams{'ID'}}[1]'>
1734                                                         </td>
1735                                                 </tr>
1736
1737                                                 <tr>
1738                                                         <td><br><br></td>
1739                                                 </tr>
1740                                         </table>
1741                                 </td>
1742                         </tr>
1743
1744                         <tr>
1745                                 <td>
1746                                         <input type='checkbox' name='ENABLE_AUTOUPDATE' $checked{'ENABLE_AUTOUPDATE'}>&nbsp;$Lang::tr{'ids enable automatic updates'}
1747                                 </td>
1748
1749                                 <td>
1750                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
1751                                 </td>
1752                         </tr>
1753
1754                         <tr>
1755                                 <td colspan='2' align='right'>
1756                                         <input type='submit' value='$Lang::tr{'back'}'>
1757 END
1758 ;
1759                                 # Check if a provider should be added or edited.
1760                                 if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1761                                         # Display button for updating the existing provider.
1762                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'update'}'>\n";
1763                                 } else {
1764                                         # Display button to add the new provider.
1765                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'add'}'>\n";
1766                                 }
1767 print <<END
1768                                 </td>
1769                         </tr>
1770                 </table>
1771         </form>
1772 END
1773 ;
1774         &Header::closebox();
1775 }
1776
1777 #
1778 ## Function to show the area where additional provider actions can be done.
1779 #
1780 sub show_additional_provider_actions() {
1781         my $disabled;
1782         my %used_providers = ();
1783
1784         # Read-in providers settings file.
1785         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
1786
1787         # Assign variable for provider handle.
1788         my $provider = "$used_providers{$cgiparams{'ID'}}[0]";
1789
1790         # Call function to get the path and name for the given provider
1791         # ruleset modifications file.
1792         my $modifications_file = &IDS::get_provider_ruleset_modifications_file($provider);
1793
1794         # Disable the reset provider button if no provider modified sids file exists.
1795         unless (-f $modifications_file) {
1796                 $disabled = "disabled";
1797         }
1798
1799         &Header::openbox('100%', 'center', "");
1800         print <<END
1801                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1802                         <table width='100%' border="0">
1803                                 <tr>
1804                                         <td align='center'>
1805                                                 <input type='hidden' name='PROVIDER' value='$provider'>
1806                                                 <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids reset provider'}' $disabled>
1807                                                 <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids force ruleset update'}'>
1808                                         </td>
1809                                 </tr>
1810                         </table>
1811                 </form>
1812 END
1813 ;
1814         &Header::closebox();
1815 }
1816
1817 #
1818 ## A function to display a notice, to lock the webpage and
1819 ## tell the user which action currently will be performed.
1820 #
1821 sub working_notice ($) {
1822         my ($message) = @_;
1823
1824         &_open_working_notice ($message);
1825         &_close_working_notice();
1826 }
1827
1828 #
1829 ## Private function to lock the page and tell the user what is going on.
1830 #
1831 sub _open_working_notice ($) {
1832         my ($message) = @_;
1833
1834         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1835         &Header::openbigbox('100%', 'left', '', $errormessage);
1836         &Header::openbox( 'Waiting', 1,);
1837                 print <<END;
1838                         <table>
1839                                 <tr>
1840                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1841                                         <td>$message</td>
1842                                 </tr>
1843 END
1844 }
1845
1846 #
1847 ## Private function to close a working notice.
1848 #
1849 sub _close_working_notice () {
1850         print "</table>\n";
1851
1852         &Header::closebox();
1853         &Header::closebigbox();
1854         &Header::closepage();
1855 }
1856
1857 #
1858 ## Function which locks the webpage and basically does the same as the
1859 ## oinkmaster function, but provides a lot of HTML formated status output.
1860 #
1861 sub oinkmaster_web () {
1862         my @enabled_providers = &IDS::get_enabled_providers();
1863
1864         # Lock the webpage and print message.
1865         &_open_working_notice("$Lang::tr{'ids apply ruleset changes'}");
1866
1867         # Check if the files in rulesdir have the correct permissions.
1868         &IDS::_check_rulesdir_permissions();
1869
1870         print "<tr><td><br><br></td></tr>\n";
1871
1872         # Cleanup the rules directory before filling it with the new rulests.
1873         &_add_to_notice("$Lang::tr{'ids remove rule structures'}");
1874         &IDS::_cleanup_rulesdir();
1875
1876         # Loop through the array of enabled providers.
1877         foreach my $provider (@enabled_providers) {
1878                 &_add_to_notice("$Lang::tr{'ids extract ruleset'} $provider");
1879                 # Call the extractruleset function.
1880                 &IDS::extractruleset($provider);
1881         }
1882
1883         # Call function to process the ruleset and do all modifications.
1884         &_add_to_notice("$Lang::tr{'ids adjust ruleset'}");
1885         &IDS::process_ruleset(@enabled_providers);
1886
1887         # Call function to merge the classification files.
1888         &_add_to_notice("$Lang::tr{'ids merge classifications'}");
1889         &IDS::merge_classifications(@enabled_providers);
1890
1891         # Call function to merge the sid to message mapping files.
1892         &_add_to_notice("$Lang::tr{'ids merge sid files'}");
1893         &IDS::merge_sid_msg(@enabled_providers);
1894
1895         # Cleanup temporary directory.
1896         &_add_to_notice("$Lang::tr{'ids cleanup tmp dir'}");
1897         &IDS::cleanup_tmp_directory();
1898
1899         # Finished - print a notice.
1900         &_add_to_notice("$Lang::tr{'ids finished'}");
1901
1902         # Close the working notice.
1903         &_close_working_notice();
1904 }
1905
1906 #
1907 ## Tiny private function to add a given message to a notice table.
1908 #
1909 sub _add_to_notice ($) {
1910         my ($message) = @_;
1911
1912         print "<tr><td colspan='2'><li><b>$message</b></li></td></tr>\n";
1913 }
1914
1915 #
1916 ## A tiny function to perform a reload of the webpage after one second.
1917 #
1918 sub reload () {
1919         print "<meta http-equiv='refresh' content='1'>\n";
1920
1921         # Stop the script.
1922         exit;
1923 }
1924
1925 #
1926 ## Private function to read-in and parse rules of a given rulefile.
1927 #
1928 ## The given file will be read, parsed and all valid rules will be stored by ID,
1929 ## message/description and it's state in the idsrules hash.
1930 #
1931 sub readrulesfile ($) {
1932         my $rulefile = shift;
1933
1934         # Open rule file and read in contents
1935         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1936
1937         # Store file content in an array.
1938         my @lines = <RULEFILE>;
1939
1940         # Close file.
1941         close(RULEFILE);
1942
1943         # Loop over rule file contents
1944         foreach my $line (@lines) {
1945                 # Remove whitespaces.
1946                 chomp $line;
1947
1948                 # Skip blank  lines.
1949                 next if ($line =~ /^\s*$/);
1950
1951                 # Local vars.
1952                 my $sid;
1953                 my $msg;
1954
1955                 # Gather rule sid and message from the ruleline.
1956                 if ($line =~ m/.*msg:\s*\"(.*?)\"\;.*sid:\s*(.*?); /) {
1957                         $msg = $1;
1958                         $sid = $2;
1959
1960                         # Check if a rule has been found.
1961                         if ($sid && $msg) {
1962                                 # Add rule to the idsrules hash.
1963                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1964
1965                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1966                                 if ($line =~ /^\#/) {
1967                                         # If yes, the rule is disabled.
1968                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1969                                 } else {
1970                                         # Otherwise the rule is enabled.
1971                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1972                                 }
1973                         }
1974                 }
1975         }
1976 }
1977
1978 #
1979 ## Function to get the used memory of a given process-id.
1980 #
1981 sub get_memory_usage($) {
1982         my ($pid) = @_;
1983
1984         my $memory = 0;
1985
1986         # Try to open the status file for the given process-id on the pseudo
1987         # file system proc.
1988         if (open(FILE, "/proc/$pid/status")) {
1989                 # Loop through the entire file.
1990                 while (<FILE>) {
1991                         # Splitt current line content and store them into variables.
1992                         my ($key, $value) = split(":", $_, 2);
1993
1994                         # Check if the current key is the one which contains the memory usage.
1995                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1996                         # of the entire process.
1997                         if ($key eq "VmRSS") {
1998                                 # Found the memory usage add it to the memory variable.
1999                                 $memory += $value;
2000
2001                                 # Break the loop.
2002                                 last;
2003                         }
2004                 }
2005
2006                 # Close file handle.
2007                 close(FILE);
2008
2009                 # Return memory usage.
2010                 return $memory;
2011         }
2012
2013         # If the file could not be open, return nothing.
2014         return;
2015 }
2016
2017 #
2018 ## Function to get the provider handle by a given ID.
2019 #
2020 sub get_provider_handle($) {
2021         my ($id) = @_;
2022
2023         my %used_providers = ();
2024
2025         # Read-in provider settings file.
2026         &General::readhasharray($IDS::providers_settings_file, \%used_providers);
2027
2028         # Obtain the provider handle for the given ID.
2029         my $provider_handle = $used_providers{$cgiparams{'ID'}}[0];
2030
2031         # Return the handle.
2032         return $provider_handle;
2033 }
2034
2035 #
2036 ## Function to get the provider name from the language file or providers file for a given handle.
2037 #
2038 sub get_provider_name($) {
2039         my ($handle) = @_;
2040         my $provider_name;
2041
2042         # Get the required translation string for the given provider handle.
2043         my $tr_string = $IDS::Ruleset::Providers{$handle}{'tr_string'};
2044
2045         # Check if the translation string is available in the language files.
2046         if ($Lang::tr{$tr_string}) {
2047                 # Use the translated string from the language file.
2048                 $provider_name = $Lang::tr{$tr_string};
2049         } else {
2050                 # Fallback and use the provider summary from the providers file.
2051                 $provider_name = $IDS::Ruleset::Providers{$handle}{'summary'};
2052         }
2053
2054         # Return the obtained provider name.
2055         return $provider_name;
2056 }
2057
2058 #
2059 ## Function to remove a provider by a given ID.
2060 #
2061 sub remove_provider($) {
2062         my ($id) = @_;
2063
2064         my %used_providers = ();
2065
2066         # Read-in provider settings file.
2067         &General::readhasharray($IDS::providers_settings_file, \%used_providers);
2068
2069         # Drop entry from the hash.
2070         delete($used_providers{$id});
2071
2072         # Write the changed hash to the provider settings file.
2073         &General::writehasharray($IDS::providers_settings_file, \%used_providers);
2074 }
2075
2076 #
2077 ## Private function to convert a given rulefile to a category name.
2078 ## ( No file extension anymore and if the name contained a dot, it
2079 ## would be replaced by a underline sign.)
2080 #
2081 sub _rulefile_to_category($) {
2082         my ($filename) = @_;
2083
2084         # Splitt the filename into single chunks and store them in a
2085         # temorary array.
2086         my @parts = split(/\./, $filename);
2087
2088         # Return / Remove last element of the temporary array.
2089         # This removes the file extension.
2090         pop @parts;
2091
2092         # Join together the single elements of the temporary array.
2093         # If these are more than one, use a "underline" for joining.
2094         my $category = join '_', @parts;
2095
2096         # Return the converted filename.
2097         return $category;
2098 }