html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2020  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32 require "${General::swroot}/network-functions.pl";
  33
  34 my %color = ();
  35 my %mainsettings = ();
  36 my %idsrules = ();
  37 my %idssettings=();
  38 my %rulessettings=();
  39 my %rulesetsources = ();
  40 my %cgiparams=();
  41 my %checked=();
  42 my %selected=();
  43 my %ignored=();
  44
  45 # Read-in main settings, for language, theme and colors.
  46 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  47 &General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
  48
  49 # Get the available network zones, based on the config type of the system and store
  50 # the list of zones in an array.
  51 my @network_zones = &Network::get_available_network_zones();
  52
  53 # Check if openvpn is started and add it to the array of network zones.
  54 if ( -e "/var/run/openvpn.pid") {
  55         push(@network_zones, "ovpn");
  56 }
  57
  58 my $errormessage;
  59
  60 # Create files if they does not exist yet.
  61 &IDS::check_and_create_filelayout();
  62
  63 # Hash which contains the colour code of a network zone.
  64 my %colourhash = (
  65         'red' => $Header::colourred,
  66         'green' => $Header::colourgreen,
  67         'blue' => $Header::colourblue,
  68         'orange' => $Header::colourorange,
  69         'ovpn' => $Header::colourovpn
  70 );
  71
  72 &Header::showhttpheaders();
  73
  74 #Get GUI values
  75 &Header::getcgihash(\%cgiparams);
  76
  77 ## Add/edit an entry to the ignore file.
  78 #
  79 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  80
  81         # Check if any input has been performed.
  82         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  83
  84                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  85                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  86                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  87                 }
  88         } else {
  89                 $errormessage = "$Lang::tr{'guardian empty input'}";
  90         }
  91
  92         # Go further if there was no error.
  93         if ($errormessage eq '') {
  94                 my %ignored = ();
  95                 my $id;
  96                 my $status;
  97
  98                 # Assign hash values.
  99                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 100                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 101
 102                 # Read-in ignoredfile.
 103                 &General::readhasharray($IDS::ignored_file, \%ignored);
 104
 105                 # Check if we should edit an existing entry and got an ID.
 106                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 107                         # Assin the provided id.
 108                         $id = $cgiparams{'ID'};
 109
 110                         # Undef the given ID.
 111                         undef($cgiparams{'ID'});
 112
 113                         # Grab the configured status of the corresponding entry.
 114                         $status = $ignored{$id}[2];
 115                 } else {
 116                         # Each newly added entry automatically should be enabled.
 117                         $status = "enabled";
 118
 119                         # Generate the ID for the new entry.
 120                         #
 121                         # Sort the keys by their ID and store them in an array.
 122                         my @keys = sort { $a <=> $b } keys %ignored;
 123
 124                         # Reverse the key array.
 125                         my @reversed = reverse(@keys);
 126
 127                         # Obtain the last used id.
 128                         my $last_id = @reversed[0];
 129
 130                         # Increase the last id by one and use it as id for the new entry.
 131                         $id = ++$last_id;
 132                 }
 133
 134                 # Add/Modify the entry to/in the ignored hash.
 135                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 136
 137                 # Write the changed ignored hash to the ignored file.
 138                 &General::writehasharray($IDS::ignored_file, \%ignored);
 139
 140                 # Regenerate the ignore file.
 141                 &IDS::generate_ignore_file();
 142         }
 143
 144         # Check if the IDS is running.
 145         if(&IDS::ids_is_running()) {
 146                 # Call suricatactrl to perform a reload.
 147                 &IDS::call_suricatactrl("reload");
 148         }
 149
 150 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 151 #
 152
 153 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 154         my %ignored = ();
 155
 156         # Only go further, if an ID has been passed.
 157         if ($cgiparams{'ID'}) {
 158                 # Assign the given ID.
 159                 my $id = $cgiparams{'ID'};
 160
 161                 # Undef the given ID.
 162                 undef($cgiparams{'ID'});
 163
 164                 # Read-in ignoredfile.
 165                 &General::readhasharray($IDS::ignored_file, \%ignored);
 166
 167                 # Grab the configured status of the corresponding entry.
 168                 my $status = $ignored{$id}[2];
 169
 170                 # Switch the status.
 171                 if ($status eq "disabled") {
 172                         $status = "enabled";
 173                 } else {
 174                         $status = "disabled";
 175                 }
 176
 177                 # Modify the status of the existing entry.
 178                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 179
 180                 # Write the changed ignored hash to the ignored file.
 181                 &General::writehasharray($IDS::ignored_file, \%ignored);
 182
 183                 # Regenerate the ignore file.
 184                 &IDS::generate_ignore_file();
 185
 186                 # Check if the IDS is running.
 187                 if(&IDS::ids_is_running()) {
 188                         # Call suricatactrl to perform a reload.
 189                         &IDS::call_suricatactrl("reload");
 190                 }
 191         }
 192
 193 ## Remove entry from ignore list.
 194 #
 195 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 196         my %ignored = ();
 197
 198         # Read-in ignoredfile.
 199         &General::readhasharray($IDS::ignored_file, \%ignored);
 200
 201         # Drop entry from the hash.
 202         delete($ignored{$cgiparams{'ID'}});
 203
 204         # Undef the given ID.
 205         undef($cgiparams{'ID'});
 206
 207         # Write the changed ignored hash to the ignored file.
 208         &General::writehasharray($IDS::ignored_file, \%ignored);
 209
 210         # Regenerate the ignore file.
 211         &IDS::generate_ignore_file();
 212
 213         # Check if the IDS is running.
 214         if(&IDS::ids_is_running()) {
 215                 # Call suricatactrl to perform a reload.
 216                 &IDS::call_suricatactrl("reload");
 217         }
 218 }
 219
 220 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 221 if (-e $IDS::ids_page_lock_file) {
 222         # Lock the webpage and print notice about autoupgrade of the ruleset
 223         # is in progess.
 224         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 225
 226         # Loop and check if the file still exists.
 227         while(-e $IDS::ids_page_lock_file) {
 228                 # Sleep for a second and re-check.
 229                 sleep 1;
 230         }
 231
 232         # Page has been unlocked, perform a reload.
 233         &reload();
 234 }
 235
 236 # Check if any error has been stored.
 237 if (-e $IDS::storederrorfile) {
 238         # Open file to read in the stored error message.
 239         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 240
 241         # Read the stored error message.
 242         $errormessage = <FILE>;
 243
 244         # Close file.
 245         close (FILE);
 246
 247         # Delete the file, which is now not longer required.
 248         unlink($IDS::storederrorfile);
 249 }
 250
 251 ## Grab all available rules and store them in the idsrules hash.
 252 #
 253 # Open rules directory and do a directory listing.
 254 opendir(DIR, $IDS::rulespath) or die $!;
 255         # Loop through the direcory.
 256         while (my $file = readdir(DIR)) {
 257
 258                 # We only want files.
 259                 next unless (-f "$IDS::rulespath/$file");
 260
 261                 # Ignore empty files.
 262                 next if (-z "$IDS::rulespath/$file");
 263
 264                 # Use a regular expression to find files ending in .rules
 265                 next unless ($file =~ m/\.rules$/);
 266
 267                 # Ignore files which are not read-able.
 268                 next unless (-R "$IDS::rulespath/$file");
 269
 270                 # Skip whitelist rules file.
 271                 next if( $file eq "whitelist.rules");
 272
 273                 # Call subfunction to read-in rulefile and add rules to
 274                 # the idsrules hash.
 275                 &readrulesfile("$file");
 276         }
 277
 278 closedir(DIR);
 279
 280 # Gather used rulefiles.
 281 #
 282 # Check if the file for activated rulefiles is not empty.
 283 if(-f $IDS::used_rulefiles_file) {
 284         # Open the file for used rulefile and read-in content.
 285         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 286
 287         # Read-in content.
 288         my @lines = <FILE>;
 289
 290         # Close file.
 291         close(FILE);
 292
 293         # Loop through the array.
 294         foreach my $line (@lines) {
 295                 # Remove newlines.
 296                 chomp($line);
 297
 298                 # Skip comments.
 299                 next if ($line =~ /\#/);
 300
 301                 # Skip blank  lines.
 302                 next if ($line =~ /^\s*$/);
 303
 304                 # Gather rule sid and message from the ruleline.
 305                 if ($line =~ /.*- (.*)/) {
 306                         my $rulefile = $1;
 307
 308                         # Check if the current rulefile exists in the %idsrules hash.
 309                         # If not, the file probably does not exist anymore or contains
 310                         # no rules.
 311                         if($idsrules{$rulefile}) {
 312                                 # Add the rulefile state to the %idsrules hash.
 313                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 314                         }
 315                 }
 316         }
 317 }
 318
 319 # Save ruleset configuration.
 320 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 321         my %oldsettings;
 322         my %rulesetsources;
 323
 324         # Read-in current (old) IDS settings.
 325         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 326
 327         # Get all available ruleset locations.
 328         &General::readhash("$IDS::rulesetsourcesfile", \%rulesetsources);
 329
 330         # Prevent form name from been stored in conf file.
 331         delete $cgiparams{'RULESET'};
 332
 333         # Grab the URL based on the choosen vendor.
 334         my $url = $rulesetsources{$cgiparams{'RULES'}};
 335
 336         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 337         if ($url =~ /\<oinkcode\>/ ) {
 338                 # Check if an subscription/oinkcode has been provided.
 339                 if ($cgiparams{'OINKCODE'}) {
 340                         # Check if the oinkcode contains unallowed chars.
 341                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 342                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 343                         }
 344                 } else {
 345                         # Print an error message, that an subsription/oinkcode is required for this
 346                         # vendor.
 347                         $errormessage = $Lang::tr{'ids oinkcode required'};
 348                 }
 349         }
 350
 351         # Go on if there are no error messages.
 352         if (!$errormessage) {
 353                 # Store settings into settings file.
 354                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 355
 356                 # Check if the the automatic rule update hass been touched.
 357                 if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 358                         # Call suricatactrl to set the new interval.
 359                         &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 360                 }
 361
 362                 # Check if a ruleset is present - if not or the source has been changed download it.
 363                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 364                         # Check if the red device is active.
 365                         unless (-e "${General::swroot}/red/active") {
 366                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 367                         }
 368
 369                         # Check if enough free disk space is availabe.
 370                         if(&IDS::checkdiskspace()) {
 371                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 372                         }
 373
 374                         # Check if any errors happend.
 375                         unless ($errormessage) {
 376                                 # Lock the webpage and print notice about downloading
 377                                 # a new ruleset.
 378                                 &working_notice("$Lang::tr{'ids working'}");
 379
 380                                 # Write the modify sid's file and pass the taken ruleaction.
 381                                 &IDS::write_modify_sids_file();
 382
 383                                 # Call subfunction to download the ruleset.
 384                                 if(&IDS::downloadruleset()) {
 385                                         $errormessage = $Lang::tr{'could not download latest updates'};
 386
 387                                         # Call function to store the errormessage.
 388                                         &IDS::_store_error_message($errormessage);
 389                                 } else {
 390                                         # Call subfunction to launch oinkmaster.
 391                                         &IDS::oinkmaster();
 392                                 }
 393
 394                                 # Check if the IDS is running.
 395                                 if(&IDS::ids_is_running()) {
 396                                         # Call suricatactrl to stop the IDS - because of the changed
 397                                         # ruleset - the use has to configure it before suricata can be
 398                                         # used again.
 399                                         &IDS::call_suricatactrl("stop");
 400                                 }
 401
 402                                 # Perform a reload of the page.
 403                                 &reload();
 404                         }
 405                 }
 406         }
 407
 408 # Save ruleset.
 409 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 410         # Arrays to store which rulefiles have been enabled and will be used.
 411         my @enabled_rulefiles;
 412
 413         # Hash to store the user-enabled and disabled sids.
 414         my %enabled_disabled_sids;
 415
 416         # Store if a restart of suricata is required.
 417         my $suricata_restart_required;
 418
 419         # Loop through the hash of idsrules.
 420         foreach my $rulefile(keys %idsrules) {
 421                 # Check if the state of the rulefile has been changed.
 422                 unless ($cgiparams{$rulefile} eq $idsrules{$rulefile}{'Rulefile'}{'State'}) {
 423                         # A restart of suricata is required to apply the changes of the used rulefiles.
 424                         $suricata_restart_required = 1;
 425                 }
 426
 427                 # Check if the rulefile is enabled.
 428                 if ($cgiparams{$rulefile} eq "on") {
 429                         # Add rulefile to the array of enabled rulefiles.
 430                         push(@enabled_rulefiles, $rulefile);
 431
 432                         # Drop item from cgiparams hash.
 433                         delete $cgiparams{$rulefile};
 434                 }
 435         }
 436
 437         # Read-in the files for enabled/disabled sids.
 438         # This will be done by calling the read_enabled_disabled_sids_file function two times
 439         # and merge the returned hashes together into the enabled_disabled_sids hash.
 440         %enabled_disabled_sids = (
 441                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 442                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 443
 444         # Loop through the hash of idsrules.
 445         foreach my $rulefile (keys %idsrules) {
 446                 # Loop through the single rules of the rulefile.
 447                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 448                         # Skip the current sid if it is not numeric.
 449                         next unless ($sid =~ /\d+/ );
 450
 451                         # Check if there exists a key in the cgiparams hash for this sid.
 452                         if (exists($cgiparams{$sid})) {
 453                                 # Look if the rule is disabled.
 454                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 455                                         # Check if the state has been set to 'on'.
 456                                         if ($cgiparams{$sid} eq "on") {
 457                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 458                                                 $enabled_disabled_sids{$sid} = "enabled";
 459
 460                                                 # Drop item from cgiparams hash.
 461                                                 delete $cgiparams{$rulefile}{$sid};
 462                                         }
 463                                 }
 464                         } else {
 465                                 # Look if the rule is enabled.
 466                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 467                                         # Check if the state is 'on' and should be disabled.
 468                                         # In this case there is no entry
 469                                         # for the sid in the cgiparams hash.
 470                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 471                                         $enabled_disabled_sids{$sid} = "disabled";
 472
 473                                         # Drop item from cgiparams hash.
 474                                         delete $cgiparams{$rulefile}{$sid};
 475                                 }
 476                         }
 477                 }
 478         }
 479
 480         # Open enabled sid's file for writing.
 481         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 482
 483         # Open disabled sid's file for writing.
 484         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 485
 486         # Write header to the files.
 487         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 488         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 489
 490         # Check if the hash for enabled/disabled files contains any entries.
 491         if (%enabled_disabled_sids) {
 492                 # Loop through the hash.
 493                 foreach my $sid (keys %enabled_disabled_sids) {
 494                         # Check if the sid is enabled.
 495                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 496                                 # Print the sid to the enabled_sids file.
 497                                 print ENABLED_FILE "enablesid $sid\n";
 498                         # Check if the sid is disabled.
 499                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 500                                 # Print the sid to the disabled_sids file.
 501                                 print DISABLED_FILE "disablesid $sid\n";
 502                         # Something strange happende - skip the current sid.
 503                         } else {
 504                                 next;
 505                         }
 506                 }
 507         }
 508
 509         # Close file for enabled_sids after writing.
 510         close(ENABLED_FILE);
 511
 512         # Close file for disabled_sids after writing.
 513         close(DISABLED_FILE);
 514
 515         # Call function to generate and write the used rulefiles file.
 516         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 517
 518         # Lock the webpage and print message.
 519         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 520
 521         # Call oinkmaster to alter the ruleset.
 522         &IDS::oinkmaster();
 523
 524         # Check if the IDS is running.
 525         if(&IDS::ids_is_running()) {
 526                 # Check if a restart of suricata is required.
 527                 if ($suricata_restart_required) {
 528                         # Call suricatactrl to perform the restart.
 529                         &IDS::call_suricatactrl("restart");
 530                 } else {
 531                         # Call suricatactrl to perform a reload.
 532                         &IDS::call_suricatactrl("reload");
 533                 }
 534         }
 535
 536         # Reload page.
 537         &reload();
 538
 539 # Download new ruleset.
 540 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 541         # Check if the red device is active.
 542         unless (-e "${General::swroot}/red/active") {
 543                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 544         }
 545
 546         # Check if enought free disk space is availabe.
 547         if(&IDS::checkdiskspace()) {
 548                 $errormessage = "$Lang::tr{'not enough disk space'}";
 549         }
 550
 551         # Check if any errors happend.
 552         unless ($errormessage) {
 553                 # Lock the webpage and print notice about downloading
 554                 # a new ruleset.
 555                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 556
 557                 # Call subfunction to download the ruleset.
 558                 if(&IDS::downloadruleset()) {
 559                         $errormessage = $Lang::tr{'could not download latest updates'};
 560
 561                         # Call function to store the errormessage.
 562                         &IDS::_store_error_message($errormessage);
 563
 564                         # Preform a reload of the page.
 565                         &reload();
 566                 } else {
 567                         # Call subfunction to launch oinkmaster.
 568                         &IDS::oinkmaster();
 569
 570                         # Check if the IDS is running.
 571                         if(&IDS::ids_is_running()) {
 572                                 # Call suricatactrl to perform a reload.
 573                                 &IDS::call_suricatactrl("reload");
 574                         }
 575
 576                         # Perform a reload of the page.
 577                         &reload();
 578                 }
 579         }
 580 # Save IDS settings.
 581 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 582         my %oldidssettings;
 583         my $reload_page;
 584         my $monitored_zones = 0;
 585
 586         # Read-in current (old) IDS settings.
 587         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 588
 589         # Prevent form name from been stored in conf file.
 590         delete $cgiparams{'IDS'};
 591
 592         # Check if the IDS should be enabled.
 593         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 594                 # Check if any ruleset is available. Otherwise abort and display an error.
 595                 unless(%idsrules) {
 596                         $errormessage = $Lang::tr{'ids no ruleset available'};
 597                 }
 598
 599                 # Loop through the array of available interfaces.
 600                 foreach my $zone (@network_zones) {
 601                         # Convert interface name into upper case.
 602                         my $zone_upper = uc($zone);
 603
 604                         # Check if the IDS is enabled for this interaces.
 605                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 606                                 # Increase count.
 607                                 $monitored_zones++;
 608                         }
 609                 }
 610
 611                 # Check if at least one zone should be monitored, or show an error.
 612                 unless ($monitored_zones >= 1) {
 613                         $errormessage = $Lang::tr{'ids no network zone'};
 614                 }
 615         }
 616
 617         # Go on if there are no error messages.
 618         if (!$errormessage) {
 619                 # Store settings into settings file.
 620                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 621         }
 622
 623         # Generate file to store the home net.
 624         &IDS::generate_home_net_file();
 625
 626         # Generate file to the store the DNS servers.
 627         &IDS::generate_dns_servers_file();
 628
 629         # Generate file to store the HTTP ports.
 630         &IDS::generate_http_ports_file();
 631
 632         # Write the modify sid's file and pass the taken ruleaction.
 633         &IDS::write_modify_sids_file();
 634
 635         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 636         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 637                 # Check if a ruleset exists.
 638                 if (%idsrules) {
 639                         # Lock the webpage and print message.
 640                         &working_notice("$Lang::tr{'ids working'}");
 641
 642                         # Call oinkmaster to alter the ruleset.
 643                         &IDS::oinkmaster();
 644
 645                         # Set reload_page to "True".
 646                         $reload_page="True";
 647                 }
 648         }
 649
 650         # Check if the IDS currently is running.
 651         if(&IDS::ids_is_running()) {
 652                 # Check if ENABLE_IDS is set to on.
 653                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 654                         # Call suricatactrl to perform a reload of suricata.
 655                         &IDS::call_suricatactrl("reload");
 656                 } else {
 657                         # Call suricatactrl to stop suricata.
 658                         &IDS::call_suricatactrl("stop");
 659                 }
 660         } else {
 661                 # Call suricatactrl to start suricata.
 662                 &IDS::call_suricatactrl("start");
 663         }
 664
 665         # Check if the page should be reloaded.
 666         if ($reload_page) {
 667                 # Perform a reload of the page.
 668                 &reload();
 669         }
 670 }
 671
 672 # Read-in idssettings and rulesetsettings
 673 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 674 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 675
 676 # If no autoupdate intervall has been configured yet, set default value.
 677 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 678         # Set default to "weekly".
 679         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 680 }
 681
 682 # Read-in ignored hosts.
 683 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 684
 685 $checked{'ENABLE_IDS'}{'off'} = '';
 686 $checked{'ENABLE_IDS'}{'on'} = '';
 687 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 688 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 689 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 690 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 691 $selected{'RULES'}{'nothing'} = '';
 692 $selected{'RULES'}{'community'} = '';
 693 $selected{'RULES'}{'emerging'} = '';
 694 $selected{'RULES'}{'registered'} = '';
 695 $selected{'RULES'}{'subscripted'} = '';
 696 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 697 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 698 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 699 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 700 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 701
 702 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 703
 704 ### Java Script ###
 705 print"<script>\n";
 706
 707 # Java script variable declaration for show and hide.
 708 print"var show = \"$Lang::tr{'ids show'}\"\;\n";
 709 print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
 710
 711 print <<END
 712         // Java Script function to show/hide the text input field for
 713         // Oinkcode/Subscription code.
 714         var update_code = function() {
 715                 if(\$('#RULES').val() == 'registered') {
 716                         \$('#code').show();
 717                 } else if(\$('#RULES').val() == 'subscripted') {
 718                         \$('#code').show();
 719                 } else if(\$('#RULES').val() == 'emerging_pro') {
 720                         \$('#code').show();
 721                 } else {
 722                         \$('#code').hide();
 723                 }
 724         };
 725
 726         // JQuery function to call corresponding function when
 727         // the ruleset is changed or the page is loaded for showing/hiding
 728         // the code area.
 729         \$(document).ready(function() {
 730                 \$('#RULES').change(update_code);
 731                 update_code();
 732         });
 733
 734         // Tiny java script function to show/hide the rules
 735         // of a given category.
 736         function showhide(tblname) {
 737                 \$("#" + tblname).toggle();
 738
 739                 // Get current content of the span element.
 740                 var content = document.getElementById("span_" + tblname);
 741
 742                 if (content.innerHTML === show) {
 743                         content.innerHTML = hide;
 744                 } else {
 745                         content.innerHTML = show;
 746                 }
 747         }
 748 </script>
 749 END
 750 ;
 751
 752 &Header::openbigbox('100%', 'left', '', $errormessage);
 753
 754 if ($errormessage) {
 755         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 756         print "<class name='base'>$errormessage\n";
 757         print "&nbsp;</class>\n";
 758         &Header::closebox();
 759 }
 760
 761 # Draw current state of the IDS
 762 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 763
 764 # Check if the IDS is running and obtain the process-id.
 765 my $pid = &IDS::ids_is_running();
 766
 767 # Display some useful information, if suricata daemon is running.
 768 if ($pid) {
 769         # Gather used memory.
 770         my $memory = &get_memory_usage($pid);
 771
 772         print <<END;
 773                 <table width='95%' cellspacing='0' class='tbl'>
 774                         <tr>
 775                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 776                         </tr>
 777
 778                         <tr>
 779                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 780                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 781                         </tr>
 782
 783                         <tr>
 784                                 <td class='base'></td>
 785                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 786                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 787                         </tr>
 788
 789                         <tr>
 790                                 <td class='base'></td>
 791                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 792                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 793                         </tr>
 794                 </table>
 795 END
 796 } else {
 797         # Otherwise display a hint that the service is not launched.
 798         print <<END;
 799                 <table width='95%' cellspacing='0' class='tbl'>
 800                         <tr>
 801                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 802                         </tr>
 803
 804                         <tr>
 805                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 806                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 807                         </tr>
 808                 </table>
 809 END
 810 }
 811
 812 # Only show this area, if a ruleset is present.
 813 if (%idsrules) {
 814
 815         print <<END
 816
 817         <br><br><h2>$Lang::tr{'settings'}</h2>
 818
 819         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 820                 <table width='100%' border='0'>
 821                         <tr>
 822                                 <td class='base' colspan='2'>
 823                                         <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 824                                 </td>
 825
 826                                 <td class='base' colspan='2'>
 827                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 828                         </td>
 829                         </tr>
 830
 831                         <tr>
 832                                 <td><br><br></td>
 833                                 <td><br><br></td>
 834                                 <td><br><br></td>
 835                                 <td><br><br></td>
 836                         </tr>
 837
 838                         <tr>
 839                                 <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 840                         </tr>
 841
 842                         <tr>
 843 END
 844 ;
 845
 846         # Loop through the array of available networks and print config options.
 847         foreach my $zone (@network_zones) {
 848                 my $checked_input;
 849                 my $checked_forward;
 850
 851                 # Convert current zone name to upper case.
 852                 my $zone_upper = uc($zone);
 853
 854                 # Set zone name.
 855                 my $zone_name = $zone;
 856
 857                 # Dirty hack to get the correct language string for the red zone.
 858                 if ($zone eq "red") {
 859                         $zone_name = "red1";
 860                 }
 861
 862                 # Grab checkbox status from settings hash.
 863                 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 864                         $checked_input = "checked = 'checked'";
 865                 }
 866
 867                 print "<td class='base' width='20%'>\n";
 868                 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 869                 print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 870                 print "</td>\n";
 871         }
 872
 873 print <<END
 874                         </tr>
 875                 </table>
 876
 877                 <br><br>
 878
 879                 <table width='100%'>
 880                         <tr>
 881                                 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 882                         </tr>
 883                 </table>
 884         </form>
 885 END
 886 ;
 887
 888 }
 889
 890 &Header::closebox();
 891
 892 # Draw elements for ruleset configuration.
 893 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 894
 895 print <<END
 896 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 897         <table width='100%' border='0'>
 898                 <tr>
 899                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 900                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 901                 </tr>
 902
 903                 <tr>
 904                         <td><select name='RULES' id='RULES'>
 905                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 906                                 <option value='emerging_pro' $selected{'RULES'}{'emerging_pro'} >$Lang::tr{'emerging pro rules'}</option>
 907                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 908                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 909                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 910                         </select>
 911                         </td>
 912
 913                         <td>
 914                                 <select name='AUTOUPDATE_INTERVAL'>
 915                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 916                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 917                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 918                                 </select>
 919                         </td>
 920                 </tr>
 921
 922                 <tr>
 923                         <td colspan='2'><br><br></td>
 924                 </tr>
 925
 926                 <tr style='display:none' id='code'>
 927                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 928                 </tr>
 929
 930                 <tr>
 931                         <td>&nbsp;</td>
 932
 933                         <td align='right'>
 934 END
 935 ;
 936                         # Show the "Update Ruleset"-Button only if a ruleset has been downloaded yet and automatic updates are disabled.
 937                         if ((%idsrules) && ($rulessettings{'AUTOUPDATE_INTERVAL'} eq "off")) {
 938                                 # Display button to update the ruleset.
 939                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 940                 }
 941 print <<END;
 942                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 943                         </td>
 944
 945                 </tr>
 946         </table>
 947 </form>
 948 END
 949 ;
 950
 951 &Header::closebox();
 952
 953 #
 954 # Whitelist / Ignorelist
 955 #
 956 &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
 957
 958 print <<END;
 959         <table width='100%'>
 960                 <tr>
 961                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 962                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 963                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 964                 </tr>
 965 END
 966                 # Check if some hosts have been added to be ignored.
 967                 if (keys (%ignored)) {
 968                         my $col = "";
 969
 970                         # Loop through all entries of the hash.
 971                         while( (my $key) = each %ignored)  {
 972                                 # Assign data array positions to some nice variable names.
 973                                 my $address = $ignored{$key}[0];
 974                                 my $remark = $ignored{$key}[1];
 975                                 my $status  = $ignored{$key}[2];
 976
 977                                 # Check if the key (id) number is even or not.
 978                                 if ($cgiparams{'ID'} eq $key) {
 979                                         $col="bgcolor='${Header::colouryellow}'";
 980                                 } elsif ($key % 2) {
 981                                         $col="bgcolor='$color{'color22'}'";
 982                                 } else {
 983                                         $col="bgcolor='$color{'color20'}'";
 984                                 }
 985
 986                                 # Choose icon for the checkbox.
 987                                 my $gif;
 988                                 my $gdesc;
 989
 990                                 # Check if the status is enabled and select the correct image and description.
 991                                 if ($status eq 'enabled' ) {
 992                                         $gif = 'on.gif';
 993                                         $gdesc = $Lang::tr{'click to disable'};
 994                                 } else {
 995                                         $gif = 'off.gif';
 996                                         $gdesc = $Lang::tr{'click to enable'};
 997                                 }
 998
 999 print <<END;
1000                                 <tr>
1001                                         <td width='20%' class='base' $col>$address</td>
1002                                         <td width='65%' class='base' $col>$remark</td>
1003
1004                                         <td align='center' $col>
1005                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1006                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
1007                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
1008                                                         <input type='hidden' name='ID' value='$key' />
1009                                                 </form>
1010                                         </td>
1011
1012                                         <td align='center' $col>
1013                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1014                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
1015                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
1016                                                         <input type='hidden' name='ID' value='$key' />
1017                                                 </form>
1018                                         </td>
1019
1020                                         <td align='center' $col>
1021                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1022                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1023                                                         <input type='hidden' name='ID' value='$key'>
1024                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1025                                                 </form>
1026                                         </td>
1027                                 </tr>
1028 END
1029                         }
1030                 } else {
1031                         # Print notice that currently no hosts are ignored.
1032                         print "<tr>\n";
1033                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1034                         print "</tr>\n";
1035                 }
1036
1037         print "</table>\n";
1038
1039         # Section to add new elements or edit existing ones.
1040 print <<END;
1041         <br>
1042         <hr>
1043         <br>
1044
1045         <div align='center'>
1046                 <table width='100%'>
1047 END
1048
1049         # Assign correct headline and button text.
1050         my $buttontext;
1051         my $entry_address;
1052         my $entry_remark;
1053
1054         # Check if an ID (key) has been given, in this case an existing entry should be edited.
1055         if ($cgiparams{'ID'} ne '') {
1056                 $buttontext = $Lang::tr{'update'};
1057                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1058
1059                         # Grab address and remark for the given key.
1060                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1061                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1062                 } else {
1063                         $buttontext = $Lang::tr{'add'};
1064                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1065                 }
1066
1067 print <<END;
1068                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1069                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1070                         <tr>
1071                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1072                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1073
1074                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1075                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1076                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1077                         </tr>
1078                         </form>
1079                 </table>
1080         </div>
1081 END
1082
1083 &Header::closebox();
1084
1085 # Only show the section for configuring the ruleset if one is present.
1086 if (%idsrules) {
1087         # Load neccessary perl modules for file stat and to format the timestamp.
1088         use File::stat;
1089         use POSIX qw( strftime );
1090
1091         # Call stat on the rulestarball.
1092         my $stat = stat("$IDS::rulestarball");
1093
1094         # Get timestamp the file creation.
1095         my $mtime = $stat->mtime;
1096
1097         # Convert into human read-able format.
1098         my $rulesdate = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime));
1099
1100         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'} ($rulesdate)" );
1101
1102                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1103
1104                 # Output display table for rule files
1105                 print "<table width='100%'>\n";
1106
1107                 # Loop over each rule file
1108                 foreach my $rulefile (sort keys(%idsrules)) {
1109                         my $rulechecked = '';
1110
1111                         # Check if rule file is enabled
1112                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1113                                 $rulechecked = 'CHECKED';
1114                         }
1115
1116                         # Convert rulefile name into category name.
1117                         my $categoryname = &_rulefile_to_category($rulefile);
1118
1119                         # Table and rows for the rule files.
1120                         print"<tr>\n";
1121                         print"<td class='base' width='5%'>\n";
1122                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1123                         print"</td>\n";
1124                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1125                         print"<td class='base' width='5%' align='right'>\n";
1126                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1127                         print"</td>\n";
1128                         print"</tr>\n";
1129
1130                         # Rows which will be hidden per default and will contain the single rules.
1131                         print"<tr  style='display:none' id='$categoryname'>\n";
1132                         print"<td colspan='3'>\n";
1133
1134                         # Local vars
1135                         my $lines;
1136                         my $rows;
1137                         my $col;
1138
1139                         # New table for the single rules.
1140                         print "<table width='100%'>\n";
1141
1142                         # Loop over rule file rules
1143                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1144                                 # Local vars
1145                                 my $ruledefchecked = '';
1146
1147                                 # Skip rulefile itself.
1148                                 next if ($sid eq "Rulefile");
1149
1150                                 # If 2 rules have been displayed, start a new row
1151                                 if (($lines % 2) == 0) {
1152                                         print "</tr><tr>\n";
1153
1154                                         # Increase rows by once.
1155                                         $rows++;
1156                                 }
1157
1158                                 # Colour lines.
1159                                 if ($rows % 2) {
1160                                         $col="bgcolor='$color{'color20'}'";
1161                                 } else {
1162                                         $col="bgcolor='$color{'color22'}'";
1163                                 }
1164
1165                                 # Set rule state
1166                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1167                                         $ruledefchecked = 'CHECKED';
1168                                 }
1169
1170                                 # Create rule checkbox and display rule description
1171                                 print "<td class='base' width='5%' align='right' $col>\n";
1172                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1173                                 print "</td>\n";
1174                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1175
1176                                 # Increment rule count
1177                                 $lines++;
1178                         }
1179
1180                         # If do not have a second rule for row, create empty cell
1181                         if (($lines % 2) != 0) {
1182                                 print "<td class='base'></td>";
1183                         }
1184
1185                         # Close display table
1186                         print "</tr></table></td></tr>";
1187                 }
1188
1189                 # Close display table
1190                 print "</table>";
1191
1192 print <<END
1193 <table width='100%'>
1194 <tr>
1195         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'></td>
1196 </tr>
1197 </table>
1198 </form>
1199 END
1200 ;
1201         &Header::closebox();
1202 }
1203
1204 &Header::closebigbox();
1205 &Header::closepage();
1206
1207 #
1208 ## A function to display a notice, to lock the webpage and
1209 ## tell the user which action currently will be performed.
1210 #
1211 sub working_notice ($) {
1212         my ($message) = @_;
1213
1214         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1215         &Header::openbigbox('100%', 'left', '', $errormessage);
1216         &Header::openbox( 'Waiting', 1,);
1217                 print <<END;
1218                         <table>
1219                                 <tr>
1220                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1221                                         <td>$message</td>
1222                                 </tr>
1223                         </table>
1224 END
1225         &Header::closebox();
1226         &Header::closebigbox();
1227         &Header::closepage();
1228 }
1229
1230 #
1231 ## A tiny function to perform a reload of the webpage after one second.
1232 #
1233 sub reload () {
1234         print "<meta http-equiv='refresh' content='1'>\n";
1235
1236         # Stop the script.
1237         exit;
1238 }
1239
1240 #
1241 ## Private function to read-in and parse rules of a given rulefile.
1242 #
1243 ## The given file will be read, parsed and all valid rules will be stored by ID,
1244 ## message/description and it's state in the idsrules hash.
1245 #
1246 sub readrulesfile ($) {
1247         my $rulefile = shift;
1248
1249         # Open rule file and read in contents
1250         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1251
1252         # Store file content in an array.
1253         my @lines = <RULEFILE>;
1254
1255         # Close file.
1256         close(RULEFILE);
1257
1258         # Loop over rule file contents
1259         foreach my $line (@lines) {
1260                 # Remove whitespaces.
1261                 chomp $line;
1262
1263                 # Skip blank  lines.
1264                 next if ($line =~ /^\s*$/);
1265
1266                 # Local vars.
1267                 my $sid;
1268                 my $msg;
1269
1270                 # Gather rule sid and message from the ruleline.
1271                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1272                         $msg = $1;
1273                         $sid = $2;
1274
1275                         # Check if a rule has been found.
1276                         if ($sid && $msg) {
1277                                 # Add rule to the idsrules hash.
1278                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1279
1280                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1281                                 if ($line =~ /^\#/) {
1282                                         # If yes, the rule is disabled.
1283                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1284                                 } else {
1285                                         # Otherwise the rule is enabled.
1286                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1287                                 }
1288                         }
1289                 }
1290         }
1291 }
1292
1293 #
1294 ## Function to get the used memory of a given process-id.
1295 #
1296 sub get_memory_usage($) {
1297         my ($pid) = @_;
1298
1299         my $memory = 0;
1300
1301         # Try to open the status file for the given process-id on the pseudo
1302         # file system proc.
1303         if (open(FILE, "/proc/$pid/status")) {
1304                 # Loop through the entire file.
1305                 while (<FILE>) {
1306                         # Splitt current line content and store them into variables.
1307                         my ($key, $value) = split(":", $_, 2);
1308
1309                         # Check if the current key is the one which contains the memory usage.
1310                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1311                         # of the entire process.
1312                         if ($key eq "VmRSS") {
1313                                 # Found the memory usage add it to the memory variable.
1314                                 $memory += $value;
1315
1316                                 # Break the loop.
1317                                 last;
1318                         }
1319                 }
1320
1321                 # Close file handle.
1322                 close(FILE);
1323
1324                 # Return memory usage.
1325                 return $memory;
1326         }
1327
1328         # If the file could not be open, return nothing.
1329         return;
1330 }
1331
1332 #
1333 ## Function to read-in the given enabled or disables sids file.
1334 #
1335 sub read_enabled_disabled_sids_file($) {
1336         my ($file) = @_;
1337
1338         # Temporary hash to store the sids and their state. It will be
1339         # returned at the end of this function.
1340         my %temphash;
1341
1342         # Open the given filename.
1343         open(FILE, "$file") or die "Could not open $file. $!\n";
1344
1345         # Loop through the file.
1346         while(<FILE>) {
1347                 # Remove newlines.
1348                 chomp $_;
1349
1350                 # Skip blank lines.
1351                 next if ($_ =~ /^\s*$/);
1352
1353                 # Skip coments.
1354                 next if ($_ =~ /^\#/);
1355
1356                 # Splitt line into sid and state part.
1357                 my ($state, $sid) = split(" ", $_);
1358
1359                 # Skip line if the sid is not numeric.
1360                 next unless ($sid =~ /\d+/ );
1361
1362                 # Check if the sid was enabled.
1363                 if ($state eq "enablesid") {
1364                         # Add the sid and its state as enabled to the temporary hash.
1365                         $temphash{$sid} = "enabled";
1366                 # Check if the sid was disabled.
1367                 } elsif ($state eq "disablesid") {
1368                         # Add the sid and its state as disabled to the temporary hash.
1369                         $temphash{$sid} = "disabled";
1370                 # Invalid state - skip the current sid and state.
1371                 } else {
1372                         next;
1373                 }
1374         }
1375
1376         # Close filehandle.
1377         close(FILE);
1378
1379         # Return the hash.
1380         return %temphash;
1381 }
1382
1383 #
1384 ## Private function to convert a given rulefile to a category name.
1385 ## ( No file extension anymore and if the name contained a dot, it
1386 ## would be replaced by a underline sign.)
1387 #
1388 sub _rulefile_to_category($) {
1389         my ($filename) = @_;
1390
1391         # Splitt the filename into single chunks and store them in a
1392         # temorary array.
1393         my @parts = split(/\./, $filename);
1394
1395         # Return / Remove last element of the temporary array.
1396         # This removes the file extension.
1397         pop @parts;
1398
1399         # Join together the single elements of the temporary array.
1400         # If these are more than one, use a "underline" for joining.
1401         my $category = join '_', @parts;
1402
1403         # Return the converted filename.
1404         return $category;
1405 }