html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulessettings=();
  38 my %rulesetsources = ();
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42 my %ignored=();
  43
  44 # Read-in main settings, for language, theme and colors.
  45 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  46 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  47
  48 # Get the available network zones, based on the config type of the system and store
  49 # the list of zones in an array.
  50 my @network_zones = &IDS::get_available_network_zones();
  51
  52 my $errormessage;
  53
  54 # Create files if they does not exist yet.
  55 &IDS::check_and_create_filelayout();
  56
  57 # Hash which contains the colour code of a network zone.
  58 my %colourhash = (
  59         'red' => $Header::colourred,
  60         'green' => $Header::colourgreen,
  61         'blue' => $Header::colourblue,
  62         'orange' => $Header::colourorange
  63 );
  64
  65 &Header::showhttpheaders();
  66
  67 #Get GUI values
  68 &Header::getcgihash(\%cgiparams);
  69
  70 ## Add/edit an entry to the ignore file.
  71 #
  72 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  73
  74         # Check if any input has been performed.
  75         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  76
  77                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  78                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  79                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  80                 }
  81         } else {
  82                 $errormessage = "$Lang::tr{'guardian empty input'}";
  83         }
  84
  85         # Go further if there was no error.
  86         if ($errormessage eq '') {
  87                 my %ignored = ();
  88                 my $id;
  89                 my $status;
  90
  91                 # Assign hash values.
  92                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
  93                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
  94
  95                 # Read-in ignoredfile.
  96                 &General::readhasharray($IDS::ignored_file, \%ignored);
  97
  98                 # Check if we should edit an existing entry and got an ID.
  99                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 100                         # Assin the provided id.
 101                         $id = $cgiparams{'ID'};
 102
 103                         # Undef the given ID.
 104                         undef($cgiparams{'ID'});
 105
 106                         # Grab the configured status of the corresponding entry.
 107                         $status = $ignored{$id}[2];
 108                 } else {
 109                         # Each newly added entry automatically should be enabled.
 110                         $status = "enabled";
 111
 112                         # Generate the ID for the new entry.
 113                         #
 114                         # Sort the keys by their ID and store them in an array.
 115                         my @keys = sort { $a <=> $b } keys %ignored;
 116
 117                         # Reverse the key array.
 118                         my @reversed = reverse(@keys);
 119
 120                         # Obtain the last used id.
 121                         my $last_id = @reversed[0];
 122
 123                         # Increase the last id by one and use it as id for the new entry.
 124                         $id = ++$last_id;
 125                 }
 126
 127                 # Add/Modify the entry to/in the ignored hash.
 128                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 129
 130                 # Write the changed ignored hash to the ignored file.
 131                 &General::writehasharray($IDS::ignored_file, \%ignored);
 132
 133                 # Regenerate the ignore file.
 134                 &IDS::generate_ignore_file();
 135         }
 136
 137         # Check if the IDS is running.
 138         if(&IDS::ids_is_running()) {
 139                 # Call suricatactrl to perform a reload.
 140                 &IDS::call_suricatactrl("reload");
 141         }
 142
 143 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 144 #
 145
 146 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 147         my %ignored = ();
 148
 149         # Only go further, if an ID has been passed.
 150         if ($cgiparams{'ID'}) {
 151                 # Assign the given ID.
 152                 my $id = $cgiparams{'ID'};
 153
 154                 # Undef the given ID.
 155                 undef($cgiparams{'ID'});
 156
 157                 # Read-in ignoredfile.
 158                 &General::readhasharray($IDS::ignored_file, \%ignored);
 159
 160                 # Grab the configured status of the corresponding entry.
 161                 my $status = $ignored{$id}[2];
 162
 163                 # Switch the status.
 164                 if ($status eq "disabled") {
 165                         $status = "enabled";
 166                 } else {
 167                         $status = "disabled";
 168                 }
 169
 170                 # Modify the status of the existing entry.
 171                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 172
 173                 # Write the changed ignored hash to the ignored file.
 174                 &General::writehasharray($IDS::ignored_file, \%ignored);
 175
 176                 # Regenerate the ignore file.
 177                 &IDS::generate_ignore_file();
 178
 179                 # Check if the IDS is running.
 180                 if(&IDS::ids_is_running()) {
 181                         # Call suricatactrl to perform a reload.
 182                         &IDS::call_suricatactrl("reload");
 183                 }
 184         }
 185
 186 ## Remove entry from ignore list.
 187 #
 188 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 189         my %ignored = ();
 190
 191         # Read-in ignoredfile.
 192         &General::readhasharray($IDS::ignored_file, \%ignored);
 193
 194         # Drop entry from the hash.
 195         delete($ignored{$cgiparams{'ID'}});
 196
 197         # Undef the given ID.
 198         undef($cgiparams{'ID'});
 199
 200         # Write the changed ignored hash to the ignored file.
 201         &General::writehasharray($IDS::ignored_file, \%ignored);
 202
 203         # Regenerate the ignore file.
 204         &IDS::generate_ignore_file();
 205
 206         # Check if the IDS is running.
 207         if(&IDS::ids_is_running()) {
 208                 # Call suricatactrl to perform a reload.
 209                 &IDS::call_suricatactrl("reload");
 210         }
 211 }
 212
 213 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 214 if (-e $IDS::ids_page_lock_file) {
 215         # Lock the webpage and print notice about autoupgrade of the ruleset
 216         # is in progess.
 217         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 218
 219         # Loop and check if the file still exists.
 220         while(-e $IDS::ids_page_lock_file) {
 221                 # Sleep for a second and re-check.
 222                 sleep 1;
 223         }
 224
 225         # Page has been unlocked, perform a reload.
 226         &reload();
 227 }
 228
 229 # Check if any error has been stored.
 230 if (-e $IDS::storederrorfile) {
 231         # Open file to read in the stored error message.
 232         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 233
 234         # Read the stored error message.
 235         $errormessage = <FILE>;
 236
 237         # Close file.
 238         close (FILE);
 239
 240         # Delete the file, which is now not longer required.
 241         unlink($IDS::storederrorfile);
 242 }
 243
 244 ## Grab all available rules and store them in the idsrules hash.
 245 #
 246 # Open rules directory and do a directory listing.
 247 opendir(DIR, $IDS::rulespath) or die $!;
 248         # Loop through the direcory.
 249         while (my $file = readdir(DIR)) {
 250
 251                 # We only want files.
 252                 next unless (-f "$IDS::rulespath/$file");
 253
 254                 # Ignore empty files.
 255                 next if (-z "$IDS::rulespath/$file");
 256
 257                 # Use a regular expression to find files ending in .rules
 258                 next unless ($file =~ m/\.rules$/);
 259
 260                 # Ignore files which are not read-able.
 261                 next unless (-R "$IDS::rulespath/$file");
 262
 263                 # Skip whitelist rules file.
 264                 next if( $file eq "whitelist.rules");
 265
 266                 # Call subfunction to read-in rulefile and add rules to
 267                 # the idsrules hash.
 268                 &readrulesfile("$file");
 269         }
 270
 271 closedir(DIR);
 272
 273 # Gather used rulefiles.
 274 #
 275 # Check if the file for activated rulefiles is not empty.
 276 if(-f $IDS::used_rulefiles_file) {
 277         # Open the file for used rulefile and read-in content.
 278         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 279
 280         # Read-in content.
 281         my @lines = <FILE>;
 282
 283         # Close file.
 284         close(FILE);
 285
 286         # Loop through the array.
 287         foreach my $line (@lines) {
 288                 # Remove newlines.
 289                 chomp($line);
 290
 291                 # Skip comments.
 292                 next if ($line =~ /\#/);
 293
 294                 # Skip blank  lines.
 295                 next if ($line =~ /^\s*$/);
 296
 297                 # Gather rule sid and message from the ruleline.
 298                 if ($line =~ /.*- (.*)/) {
 299                         my $rulefile = $1;
 300
 301                         # Check if the current rulefile exists in the %idsrules hash.
 302                         # If not, the file probably does not exist anymore or contains
 303                         # no rules.
 304                         if($idsrules{$rulefile}) {
 305                                 # Add the rulefile state to the %idsrules hash.
 306                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 307                         }
 308                 }
 309         }
 310 }
 311
 312 # Save ruleset configuration.
 313 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 314         my %oldsettings;
 315         my %rulesetsources;
 316
 317         # Read-in current (old) IDS settings.
 318         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 319
 320         # Get all available ruleset locations.
 321         &General::readhash("$IDS::rulesetsourcesfile", \%rulesetsources);
 322
 323         # Prevent form name from been stored in conf file.
 324         delete $cgiparams{'RULESET'};
 325
 326         # Grab the URL based on the choosen vendor.
 327         my $url = $rulesetsources{$cgiparams{'RULES'}};
 328
 329         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 330         if ($url =~ /\<oinkcode\>/ ) {
 331                 # Check if an subscription/oinkcode has been provided.
 332                 if ($cgiparams{'OINKCODE'}) {
 333                         # Check if the oinkcode contains unallowed chars.
 334                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 335                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 336                         }
 337                 } else {
 338                         # Print an error message, that an subsription/oinkcode is required for this
 339                         # vendor.
 340                         $errormessage = $Lang::tr{'ids oinkcode required'};
 341                 }
 342         }
 343
 344         # Go on if there are no error messages.
 345         if (!$errormessage) {
 346                 # Store settings into settings file.
 347                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 348
 349                 # Check if the the automatic rule update hass been touched.
 350                 if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 351                         # Call suricatactrl to set the new interval.
 352                         &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 353                 }
 354
 355                 # Check if a ruleset is present - if not or the source has been changed download it.
 356                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 357                         # Check if the red device is active.
 358                         unless (-e "${General::swroot}/red/active") {
 359                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 360                         }
 361
 362                         # Check if enough free disk space is availabe.
 363                         if(&IDS::checkdiskspace()) {
 364                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 365                         }
 366
 367                         # Check if any errors happend.
 368                         unless ($errormessage) {
 369                                 # Lock the webpage and print notice about downloading
 370                                 # a new ruleset.
 371                                 &working_notice("$Lang::tr{'ids working'}");
 372
 373                                 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 374
 375                                 # Temporary variable to set the ruleaction.
 376                                 # Default is "drop" to use suricata as IPS.
 377                                 my $ruleaction="drop";
 378
 379                                 # Check if the traffic only should be monitored.
 380                                 if($idssettings{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 381                                         # Switch the ruleaction to "alert".
 382                                         # Suricata acts as an IDS only.
 383                                         $ruleaction="alert";
 384                                 }
 385
 386                                 # Write the modify sid's file and pass the taken ruleaction.
 387                                 &IDS::write_modify_sids_file($ruleaction, $cgiparams{'RULES'});
 388
 389                                 # Call subfunction to download the ruleset.
 390                                 if(&IDS::downloadruleset()) {
 391                                         $errormessage = $Lang::tr{'could not download latest updates'};
 392
 393                                         # Call function to store the errormessage.
 394                                         &IDS::_store_error_message($errormessage);
 395                                 } else {
 396                                         # Call subfunction to launch oinkmaster.
 397                                         &IDS::oinkmaster();
 398                                 }
 399
 400                                 # Check if the IDS is running.
 401                                 if(&IDS::ids_is_running()) {
 402                                         # Call suricatactrl to stop the IDS - because of the changed
 403                                         # ruleset - the use has to configure it before suricata can be
 404                                         # used again.
 405                                         &IDS::call_suricatactrl("stop");
 406                                 }
 407
 408                                 # Perform a reload of the page.
 409                                 &reload();
 410                         }
 411                 }
 412         }
 413
 414 # Save ruleset.
 415 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 416         # Arrays to store which rulefiles have been enabled and will be used.
 417         my @enabled_rulefiles;
 418
 419         # Hash to store the user-enabled and disabled sids.
 420         my %enabled_disabled_sids;
 421
 422         # Loop through the hash of idsrules.
 423         foreach my $rulefile(keys %idsrules) {
 424                 # Check if the rulefile is enabled.
 425                 if ($cgiparams{$rulefile} eq "on") {
 426                         # Add rulefile to the array of enabled rulefiles.
 427                         push(@enabled_rulefiles, $rulefile);
 428
 429                         # Drop item from cgiparams hash.
 430                         delete $cgiparams{$rulefile};
 431                 }
 432         }
 433
 434         # Read-in the files for enabled/disabled sids.
 435         # This will be done by calling the read_enabled_disabled_sids_file function two times
 436         # and merge the returned hashes together into the enabled_disabled_sids hash.
 437         %enabled_disabled_sids = (
 438                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 439                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 440
 441         # Loop through the hash of idsrules.
 442         foreach my $rulefile (keys %idsrules) {
 443                 # Loop through the single rules of the rulefile.
 444                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 445                         # Skip the current sid if it is not numeric.
 446                         next unless ($sid =~ /\d+/ );
 447
 448                         # Check if there exists a key in the cgiparams hash for this sid.
 449                         if (exists($cgiparams{$sid})) {
 450                                 # Look if the rule is disabled.
 451                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 452                                         # Check if the state has been set to 'on'.
 453                                         if ($cgiparams{$sid} eq "on") {
 454                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 455                                                 $enabled_disabled_sids{$sid} = "enabled";
 456
 457                                                 # Drop item from cgiparams hash.
 458                                                 delete $cgiparams{$rulefile}{$sid};
 459                                         }
 460                                 }
 461                         } else {
 462                                 # Look if the rule is enabled.
 463                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 464                                         # Check if the state is 'on' and should be disabled.
 465                                         # In this case there is no entry
 466                                         # for the sid in the cgiparams hash.
 467                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 468                                         $enabled_disabled_sids{$sid} = "disabled";
 469
 470                                         # Drop item from cgiparams hash.
 471                                         delete $cgiparams{$rulefile}{$sid};
 472                                 }
 473                         }
 474                 }
 475         }
 476
 477         # Open enabled sid's file for writing.
 478         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 479
 480         # Open disabled sid's file for writing.
 481         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 482
 483         # Write header to the files.
 484         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 485         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 486
 487         # Check if the hash for enabled/disabled files contains any entries.
 488         if (%enabled_disabled_sids) {
 489                 # Loop through the hash.
 490                 foreach my $sid (keys %enabled_disabled_sids) {
 491                         # Check if the sid is enabled.
 492                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 493                                 # Print the sid to the enabled_sids file.
 494                                 print ENABLED_FILE "enablesid $sid\n";
 495                         # Check if the sid is disabled.
 496                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 497                                 # Print the sid to the disabled_sids file.
 498                                 print DISABLED_FILE "disablesid $sid\n";
 499                         # Something strange happende - skip the current sid.
 500                         } else {
 501                                 next;
 502                         }
 503                 }
 504         }
 505
 506         # Close file for enabled_sids after writing.
 507         close(ENABLED_FILE);
 508
 509         # Close file for disabled_sids after writing.
 510         close(DISABLED_FILE);
 511
 512         # Call function to generate and write the used rulefiles file.
 513         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 514
 515         # Lock the webpage and print message.
 516         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 517
 518         # Call oinkmaster to alter the ruleset.
 519         &IDS::oinkmaster();
 520
 521         # Check if the IDS is running.
 522         if(&IDS::ids_is_running()) {
 523                 # Call suricatactrl to perform a reload.
 524                 &IDS::call_suricatactrl("reload");
 525         }
 526
 527         # Reload page.
 528         &reload();
 529
 530 # Download new ruleset.
 531 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 532         # Check if the red device is active.
 533         unless (-e "${General::swroot}/red/active") {
 534                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 535         }
 536
 537         # Check if enought free disk space is availabe.
 538         if(&IDS::checkdiskspace()) {
 539                 $errormessage = "$Lang::tr{'not enough disk space'}";
 540         }
 541
 542         # Check if any errors happend.
 543         unless ($errormessage) {
 544                 # Lock the webpage and print notice about downloading
 545                 # a new ruleset.
 546                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 547
 548                 # Call subfunction to download the ruleset.
 549                 if(&IDS::downloadruleset()) {
 550                         $errormessage = $Lang::tr{'could not download latest updates'};
 551
 552                         # Call function to store the errormessage.
 553                         &IDS::_store_error_message($errormessage);
 554
 555                         # Preform a reload of the page.
 556                         &reload();
 557                 } else {
 558                         # Call subfunction to launch oinkmaster.
 559                         &IDS::oinkmaster();
 560
 561                         # Check if the IDS is running.
 562                         if(&IDS::ids_is_running()) {
 563                                 # Call suricatactrl to perform a reload.
 564                                 &IDS::call_suricatactrl("reload");
 565                         }
 566
 567                         # Perform a reload of the page.
 568                         &reload();
 569                 }
 570         }
 571 # Save IDS settings.
 572 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 573         my %oldidssettings;
 574         my $reload_page;
 575         my $monitored_zones = 0;
 576
 577         # Read-in current (old) IDS settings.
 578         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 579
 580         # Prevent form name from been stored in conf file.
 581         delete $cgiparams{'IDS'};
 582
 583         # Check if the IDS should be enabled.
 584         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 585                 # Check if any ruleset is available. Otherwise abort and display an error.
 586                 unless(%idsrules) {
 587                         $errormessage = $Lang::tr{'ids no ruleset available'};
 588                 }
 589
 590                 # Loop through the array of available interfaces.
 591                 foreach my $zone (@network_zones) {
 592                         # Convert interface name into upper case.
 593                         my $zone_upper = uc($zone);
 594
 595                         # Check if the IDS is enabled for this interaces.
 596                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 597                                 # Increase count.
 598                                 $monitored_zones++;
 599                         }
 600                 }
 601
 602                 # Check if at least one zone should be monitored, or show an error.
 603                 unless ($monitored_zones >= 1) {
 604                         $errormessage = $Lang::tr{'ids no network zone'};
 605                 }
 606         }
 607
 608         # Go on if there are no error messages.
 609         if (!$errormessage) {
 610                 # Store settings into settings file.
 611                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 612         }
 613
 614         # Generate file to store the home net.
 615         &IDS::generate_home_net_file();
 616
 617         # Temporary variable to set the ruleaction.
 618         # Default is "drop" to use suricata as IPS.
 619         my $ruleaction="drop";
 620
 621         # Check if the traffic only should be monitored.
 622         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 623                 # Switch the ruleaction to "alert".
 624                 # Suricata acts as an IDS only.
 625                 $ruleaction="alert";
 626         }
 627
 628         &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 629
 630         # Write the modify sid's file and pass the taken ruleaction.
 631         &IDS::write_modify_sids_file($ruleaction, $rulessettings{'RULES'});
 632
 633         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 634         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 635                 # Check if a ruleset exists.
 636                 if (%idsrules) {
 637                         # Lock the webpage and print message.
 638                         &working_notice("$Lang::tr{'ids working'}");
 639
 640                         # Call oinkmaster to alter the ruleset.
 641                         &IDS::oinkmaster();
 642
 643                         # Set reload_page to "True".
 644                         $reload_page="True";
 645                 }
 646         }
 647
 648         # Check if the IDS currently is running.
 649         if(&IDS::ids_is_running()) {
 650                 # Check if ENABLE_IDS is set to on.
 651                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 652                         # Call suricatactrl to perform a reload of suricata.
 653                         &IDS::call_suricatactrl("reload");
 654                 } else {
 655                         # Call suricatactrl to stop suricata.
 656                         &IDS::call_suricatactrl("stop");
 657                 }
 658         } else {
 659                 # Call suricatactrl to start suricata.
 660                 &IDS::call_suricatactrl("start");
 661         }
 662
 663         # Check if the page should be reloaded.
 664         if ($reload_page) {
 665                 # Perform a reload of the page.
 666                 &reload();
 667         }
 668 }
 669
 670 # Read-in idssettings and rulesetsettings
 671 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 672 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 673
 674 # If no autoupdate intervall has been configured yet, set default value.
 675 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 676         # Set default to "weekly".
 677         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 678 }
 679
 680 # Read-in ignored hosts.
 681 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 682
 683 $checked{'ENABLE_IDS'}{'off'} = '';
 684 $checked{'ENABLE_IDS'}{'on'} = '';
 685 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 686 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 687 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 688 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 689 $selected{'RULES'}{'nothing'} = '';
 690 $selected{'RULES'}{'community'} = '';
 691 $selected{'RULES'}{'emerging'} = '';
 692 $selected{'RULES'}{'registered'} = '';
 693 $selected{'RULES'}{'subscripted'} = '';
 694 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 695 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 696 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 697 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 698 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 699
 700 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 701
 702 ### Java Script ###
 703 print"<script>\n";
 704
 705 # Java script variable declaration for show and hide.
 706 print"var show = \"$Lang::tr{'ids show'}\"\;\n";
 707 print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
 708
 709 print <<END
 710         // Java Script function to show/hide the text input field for
 711         // Oinkcode/Subscription code.
 712         var update_code = function() {
 713                 if(\$('#RULES').val() == 'registered') {
 714                         \$('#code').show();
 715                 } else if(\$('#RULES').val() == 'subscripted') {
 716                         \$('#code').show();
 717                 } else if(\$('#RULES').val() == 'emerging_pro') {
 718                         \$('#code').show();
 719                 } else {
 720                         \$('#code').hide();
 721                 }
 722         };
 723
 724         // JQuery function to call corresponding function when
 725         // the ruleset is changed or the page is loaded for showing/hiding
 726         // the code area.
 727         \$(document).ready(function() {
 728                 \$('#RULES').change(update_code);
 729                 update_code();
 730         });
 731
 732         // Tiny java script function to show/hide the rules
 733         // of a given category.
 734         function showhide(tblname) {
 735                 \$("#" + tblname).toggle();
 736
 737                 // Get current content of the span element.
 738                 var content = document.getElementById("span_" + tblname);
 739
 740                 if (content.innerHTML === show) {
 741                         content.innerHTML = hide;
 742                 } else {
 743                         content.innerHTML = show;
 744                 }
 745         }
 746 </script>
 747 END
 748 ;
 749
 750 &Header::openbigbox('100%', 'left', '', $errormessage);
 751
 752 if ($errormessage) {
 753         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 754         print "<class name='base'>$errormessage\n";
 755         print "&nbsp;</class>\n";
 756         &Header::closebox();
 757 }
 758
 759 # Draw current state of the IDS
 760 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 761
 762 # Check if the IDS is running and obtain the process-id.
 763 my $pid = &IDS::ids_is_running();
 764
 765 # Display some useful information, if suricata daemon is running.
 766 if ($pid) {
 767         # Gather used memory.
 768         my $memory = &get_memory_usage($pid);
 769
 770         print <<END;
 771                 <table width='95%' cellspacing='0' class='tbl'>
 772                         <tr>
 773                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 774                         </tr>
 775
 776                         <tr>
 777                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 778                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 779                         </tr>
 780
 781                         <tr>
 782                                 <td class='base'></td>
 783                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 784                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 785                         </tr>
 786
 787                         <tr>
 788                                 <td class='base'></td>
 789                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 790                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 791                         </tr>
 792                 </table>
 793 END
 794 } else {
 795         # Otherwise display a hint that the service is not launched.
 796         print <<END;
 797                 <table width='95%' cellspacing='0' class='tbl'>
 798                         <tr>
 799                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 800                         </tr>
 801
 802                         <tr>
 803                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 804                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 805                         </tr>
 806                 </table>
 807 END
 808 }
 809
 810 # Only show this area, if a ruleset is present.
 811 if (%idsrules) {
 812
 813         print <<END
 814
 815         <br><br><h2>$Lang::tr{'settings'}</h2>
 816
 817         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 818                 <table width='100%' border='0'>
 819                         <tr>
 820                                 <td class='base' colspan='2'>
 821                                         <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 822                                 </td>
 823
 824                                 <td class='base' colspan='2'>
 825                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 826                         </td>
 827                         </tr>
 828
 829                         <tr>
 830                                 <td><br><br></td>
 831                                 <td><br><br></td>
 832                                 <td><br><br></td>
 833                                 <td><br><br></td>
 834                         </tr>
 835
 836                         <tr>
 837                                 <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 838                         </tr>
 839
 840                         <tr>
 841 END
 842 ;
 843
 844         # Loop through the array of available networks and print config options.
 845         foreach my $zone (@network_zones) {
 846                 my $checked_input;
 847                 my $checked_forward;
 848
 849                 # Convert current zone name to upper case.
 850                 my $zone_upper = uc($zone);
 851
 852                 # Set zone name.
 853                 my $zone_name = $zone;
 854
 855                 # Dirty hack to get the correct language string for the red zone.
 856                 if ($zone eq "red") {
 857                         $zone_name = "red1";
 858                 }
 859
 860                 # Grab checkbox status from settings hash.
 861                 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 862                         $checked_input = "checked = 'checked'";
 863                 }
 864
 865                 print "<td class='base' width='25%'>\n";
 866                 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 867                 print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 868                 print "</td>\n";
 869         }
 870
 871 print <<END
 872                         </tr>
 873                 </table>
 874
 875                 <br><br>
 876
 877                 <table width='100%'>
 878                         <tr>
 879                                 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 880                         </tr>
 881                 </table>
 882         </form>
 883 END
 884 ;
 885
 886 }
 887
 888 &Header::closebox();
 889
 890 # Draw elements for ruleset configuration.
 891 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 892
 893 print <<END
 894 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 895         <table width='100%' border='0'>
 896                 <tr>
 897                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 898                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 899                 </tr>
 900
 901                 <tr>
 902                         <td><select name='RULES' id='RULES'>
 903                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 904                                 <option value='emerging_pro' $selected{'RULES'}{'emerging_pro'} >$Lang::tr{'emerging pro rules'}</option>
 905                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 906                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 907                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 908                         </select>
 909                         </td>
 910
 911                         <td>
 912                                 <select name='AUTOUPDATE_INTERVAL'>
 913                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 914                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 915                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 916                                 </select>
 917                         </td>
 918                 </tr>
 919
 920                 <tr>
 921                         <td colspan='2'><br><br></td>
 922                 </tr>
 923
 924                 <tr style='display:none' id='code'>
 925                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 926                 </tr>
 927
 928                 <tr>
 929                         <td>&nbsp;</td>
 930
 931                         <td align='right'>
 932 END
 933 ;
 934                         # Show the "Update Ruleset"-Button only if a ruleset has been downloaded yet and automatic updates are disabled.
 935                         if ((%idsrules) && ($rulessettings{'AUTOUPDATE_INTERVAL'} eq "off")) {
 936                                 # Display button to update the ruleset.
 937                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 938                 }
 939 print <<END;
 940                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 941                         </td>
 942
 943                 </tr>
 944         </table>
 945 </form>
 946 END
 947 ;
 948
 949 &Header::closebox();
 950
 951 #
 952 # Whitelist / Ignorelist
 953 #
 954 &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
 955
 956 print <<END;
 957         <table width='100%'>
 958                 <tr>
 959                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 960                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 961                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 962                 </tr>
 963 END
 964                 # Check if some hosts have been added to be ignored.
 965                 if (keys (%ignored)) {
 966                         my $col = "";
 967
 968                         # Loop through all entries of the hash.
 969                         while( (my $key) = each %ignored)  {
 970                                 # Assign data array positions to some nice variable names.
 971                                 my $address = $ignored{$key}[0];
 972                                 my $remark = $ignored{$key}[1];
 973                                 my $status  = $ignored{$key}[2];
 974
 975                                 # Check if the key (id) number is even or not.
 976                                 if ($cgiparams{'ID'} eq $key) {
 977                                         $col="bgcolor='${Header::colouryellow}'";
 978                                 } elsif ($key % 2) {
 979                                         $col="bgcolor='$color{'color22'}'";
 980                                 } else {
 981                                         $col="bgcolor='$color{'color20'}'";
 982                                 }
 983
 984                                 # Choose icon for the checkbox.
 985                                 my $gif;
 986                                 my $gdesc;
 987
 988                                 # Check if the status is enabled and select the correct image and description.
 989                                 if ($status eq 'enabled' ) {
 990                                         $gif = 'on.gif';
 991                                         $gdesc = $Lang::tr{'click to disable'};
 992                                 } else {
 993                                         $gif = 'off.gif';
 994                                         $gdesc = $Lang::tr{'click to enable'};
 995                                 }
 996
 997 print <<END;
 998                                 <tr>
 999                                         <td width='20%' class='base' $col>$address</td>
1000                                         <td width='65%' class='base' $col>$remark</td>
1001
1002                                         <td align='center' $col>
1003                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1004                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
1005                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
1006                                                         <input type='hidden' name='ID' value='$key' />
1007                                                 </form>
1008                                         </td>
1009
1010                                         <td align='center' $col>
1011                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1012                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
1013                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
1014                                                         <input type='hidden' name='ID' value='$key' />
1015                                                 </form>
1016                                         </td>
1017
1018                                         <td align='center' $col>
1019                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1020                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1021                                                         <input type='hidden' name='ID' value='$key'>
1022                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1023                                                 </form>
1024                                         </td>
1025                                 </tr>
1026 END
1027                         }
1028                 } else {
1029                         # Print notice that currently no hosts are ignored.
1030                         print "<tr>\n";
1031                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1032                         print "</tr>\n";
1033                 }
1034
1035         print "</table>\n";
1036
1037         # Section to add new elements or edit existing ones.
1038 print <<END;
1039         <br>
1040         <hr>
1041         <br>
1042
1043         <div align='center'>
1044                 <table width='100%'>
1045 END
1046
1047         # Assign correct headline and button text.
1048         my $buttontext;
1049         my $entry_address;
1050         my $entry_remark;
1051
1052         # Check if an ID (key) has been given, in this case an existing entry should be edited.
1053         if ($cgiparams{'ID'} ne '') {
1054                 $buttontext = $Lang::tr{'update'};
1055                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1056
1057                         # Grab address and remark for the given key.
1058                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1059                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1060                 } else {
1061                         $buttontext = $Lang::tr{'add'};
1062                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1063                 }
1064
1065 print <<END;
1066                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1067                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1068                         <tr>
1069                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1070                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1071
1072                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1073                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1074                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1075                         </tr>
1076                         </form>
1077                 </table>
1078         </div>
1079 END
1080
1081 &Header::closebox();
1082
1083 # Only show the section for configuring the ruleset if one is present.
1084 if (%idsrules) {
1085         # Load neccessary perl modules for file stat and to format the timestamp.
1086         use File::stat;
1087         use POSIX qw( strftime );
1088
1089         # Call stat on the rulestarball.
1090         my $stat = stat("$IDS::rulestarball");
1091
1092         # Get timestamp the file creation.
1093         my $mtime = $stat->mtime;
1094
1095         # Convert into human read-able format.
1096         my $rulesdate = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime));
1097
1098         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'} ($rulesdate)" );
1099
1100                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1101
1102                 # Output display table for rule files
1103                 print "<table width='100%'>\n";
1104
1105                 # Loop over each rule file
1106                 foreach my $rulefile (sort keys(%idsrules)) {
1107                         my $rulechecked = '';
1108
1109                         # Check if rule file is enabled
1110                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1111                                 $rulechecked = 'CHECKED';
1112                         }
1113
1114                         # Convert rulefile name into category name.
1115                         my $categoryname = &_rulefile_to_category($rulefile);
1116
1117                         # Table and rows for the rule files.
1118                         print"<tr>\n";
1119                         print"<td class='base' width='5%'>\n";
1120                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1121                         print"</td>\n";
1122                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1123                         print"<td class='base' width='5%' align='right'>\n";
1124                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1125                         print"</td>\n";
1126                         print"</tr>\n";
1127
1128                         # Rows which will be hidden per default and will contain the single rules.
1129                         print"<tr  style='display:none' id='$categoryname'>\n";
1130                         print"<td colspan='3'>\n";
1131
1132                         # Local vars
1133                         my $lines;
1134                         my $rows;
1135                         my $col;
1136
1137                         # New table for the single rules.
1138                         print "<table width='100%'>\n";
1139
1140                         # Loop over rule file rules
1141                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1142                                 # Local vars
1143                                 my $ruledefchecked = '';
1144
1145                                 # Skip rulefile itself.
1146                                 next if ($sid eq "Rulefile");
1147
1148                                 # If 2 rules have been displayed, start a new row
1149                                 if (($lines % 2) == 0) {
1150                                         print "</tr><tr>\n";
1151
1152                                         # Increase rows by once.
1153                                         $rows++;
1154                                 }
1155
1156                                 # Colour lines.
1157                                 if ($rows % 2) {
1158                                         $col="bgcolor='$color{'color20'}'";
1159                                 } else {
1160                                         $col="bgcolor='$color{'color22'}'";
1161                                 }
1162
1163                                 # Set rule state
1164                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1165                                         $ruledefchecked = 'CHECKED';
1166                                 }
1167
1168                                 # Create rule checkbox and display rule description
1169                                 print "<td class='base' width='5%' align='right' $col>\n";
1170                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1171                                 print "</td>\n";
1172                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1173
1174                                 # Increment rule count
1175                                 $lines++;
1176                         }
1177
1178                         # If do not have a second rule for row, create empty cell
1179                         if (($lines % 2) != 0) {
1180                                 print "<td class='base'></td>";
1181                         }
1182
1183                         # Close display table
1184                         print "</tr></table></td></tr>";
1185                 }
1186
1187                 # Close display table
1188                 print "</table>";
1189
1190 print <<END
1191 <table width='100%'>
1192 <tr>
1193         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'></td>
1194 </tr>
1195 </table>
1196 </form>
1197 END
1198 ;
1199         &Header::closebox();
1200 }
1201
1202 &Header::closebigbox();
1203 &Header::closepage();
1204
1205 #
1206 ## A function to display a notice, to lock the webpage and
1207 ## tell the user which action currently will be performed.
1208 #
1209 sub working_notice ($) {
1210         my ($message) = @_;
1211
1212         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1213         &Header::openbigbox('100%', 'left', '', $errormessage);
1214         &Header::openbox( 'Waiting', 1,);
1215                 print <<END;
1216                         <table>
1217                                 <tr>
1218                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1219                                         <td>$message</td>
1220                                 </tr>
1221                         </table>
1222 END
1223         &Header::closebox();
1224         &Header::closebigbox();
1225         &Header::closepage();
1226 }
1227
1228 #
1229 ## A tiny function to perform a reload of the webpage after one second.
1230 #
1231 sub reload () {
1232         print "<meta http-equiv='refresh' content='1'>\n";
1233
1234         # Stop the script.
1235         exit;
1236 }
1237
1238 #
1239 ## Private function to read-in and parse rules of a given rulefile.
1240 #
1241 ## The given file will be read, parsed and all valid rules will be stored by ID,
1242 ## message/description and it's state in the idsrules hash.
1243 #
1244 sub readrulesfile ($) {
1245         my $rulefile = shift;
1246
1247         # Open rule file and read in contents
1248         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1249
1250         # Store file content in an array.
1251         my @lines = <RULEFILE>;
1252
1253         # Close file.
1254         close(RULEFILE);
1255
1256         # Loop over rule file contents
1257         foreach my $line (@lines) {
1258                 # Remove whitespaces.
1259                 chomp $line;
1260
1261                 # Skip blank  lines.
1262                 next if ($line =~ /^\s*$/);
1263
1264                 # Local vars.
1265                 my $sid;
1266                 my $msg;
1267
1268                 # Gather rule sid and message from the ruleline.
1269                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1270                         $msg = $1;
1271                         $sid = $2;
1272
1273                         # Check if a rule has been found.
1274                         if ($sid && $msg) {
1275                                 # Add rule to the idsrules hash.
1276                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1277
1278                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1279                                 if ($line =~ /^\#/) {
1280                                         # If yes, the rule is disabled.
1281                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1282                                 } else {
1283                                         # Otherwise the rule is enabled.
1284                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1285                                 }
1286                         }
1287                 }
1288         }
1289 }
1290
1291 #
1292 ## Function to get the used memory of a given process-id.
1293 #
1294 sub get_memory_usage($) {
1295         my ($pid) = @_;
1296
1297         my $memory = 0;
1298
1299         # Try to open the status file for the given process-id on the pseudo
1300         # file system proc.
1301         if (open(FILE, "/proc/$pid/status")) {
1302                 # Loop through the entire file.
1303                 while (<FILE>) {
1304                         # Splitt current line content and store them into variables.
1305                         my ($key, $value) = split(":", $_, 2);
1306
1307                         # Check if the current key is the one which contains the memory usage.
1308                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1309                         # of the entire process.
1310                         if ($key eq "VmRSS") {
1311                                 # Found the memory usage add it to the memory variable.
1312                                 $memory += $value;
1313
1314                                 # Break the loop.
1315                                 last;
1316                         }
1317                 }
1318
1319                 # Close file handle.
1320                 close(FILE);
1321
1322                 # Return memory usage.
1323                 return $memory;
1324         }
1325
1326         # If the file could not be open, return nothing.
1327         return;
1328 }
1329
1330 #
1331 ## Function to read-in the given enabled or disables sids file.
1332 #
1333 sub read_enabled_disabled_sids_file($) {
1334         my ($file) = @_;
1335
1336         # Temporary hash to store the sids and their state. It will be
1337         # returned at the end of this function.
1338         my %temphash;
1339
1340         # Open the given filename.
1341         open(FILE, "$file") or die "Could not open $file. $!\n";
1342
1343         # Loop through the file.
1344         while(<FILE>) {
1345                 # Remove newlines.
1346                 chomp $_;
1347
1348                 # Skip blank lines.
1349                 next if ($_ =~ /^\s*$/);
1350
1351                 # Skip coments.
1352                 next if ($_ =~ /^\#/);
1353
1354                 # Splitt line into sid and state part.
1355                 my ($state, $sid) = split(" ", $_);
1356
1357                 # Skip line if the sid is not numeric.
1358                 next unless ($sid =~ /\d+/ );
1359
1360                 # Check if the sid was enabled.
1361                 if ($state eq "enablesid") {
1362                         # Add the sid and its state as enabled to the temporary hash.
1363                         $temphash{$sid} = "enabled";
1364                 # Check if the sid was disabled.
1365                 } elsif ($state eq "disablesid") {
1366                         # Add the sid and its state as disabled to the temporary hash.
1367                         $temphash{$sid} = "disabled";
1368                 # Invalid state - skip the current sid and state.
1369                 } else {
1370                         next;
1371                 }
1372         }
1373
1374         # Close filehandle.
1375         close(FILE);
1376
1377         # Return the hash.
1378         return %temphash;
1379 }
1380
1381 #
1382 ## Private function to convert a given rulefile to a category name.
1383 ## ( No file extension anymore and if the name contained a dot, it
1384 ## would be replaced by a underline sign.)
1385 #
1386 sub _rulefile_to_category($) {
1387         my ($filename) = @_;
1388
1389         # Splitt the filename into single chunks and store them in a
1390         # temorary array.
1391         my @parts = split(/\./, $filename);
1392
1393         # Return / Remove last element of the temporary array.
1394         # This removes the file extension.
1395         pop @parts;
1396
1397         # Join together the single elements of the temporary array.
1398         # If these are more than one, use a "underline" for joining.
1399         my $category = join '_', @parts;
1400
1401         # Return the converted filename.
1402         return $category;
1403 }