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 enought 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                                 # Call subfunction to download the ruleset.
 374                                 if(&IDS::downloadruleset()) {
 375                                         $errormessage = $Lang::tr{'could not download latest updates'};
 376
 377                                         # Call function to store the errormessage.
 378                                         &IDS::_store_error_message($errormessage);
 379                                 } else {
 380                                         # Call subfunction to launch oinkmaster.
 381                                         &IDS::oinkmaster();
 382                                 }
 383
 384                                 # Check if the IDS is running.
 385                                 if(&IDS::ids_is_running()) {
 386                                         # Call suricatactrl to stop the IDS - because of the changed
 387                                         # ruleset - the use has to configure it before suricata can be
 388                                         # used again.
 389                                         &IDS::call_suricatactrl("stop");
 390                                 }
 391
 392                                 # Perform a reload of the page.
 393                                 &reload();
 394                         }
 395                 }
 396         }
 397
 398 # Save ruleset.
 399 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 400         # Arrays to store which rulefiles have been enabled and will be used.
 401         my @enabled_rulefiles;
 402
 403         # Hash to store the user-enabled and disabled sids.
 404         my %enabled_disabled_sids;
 405
 406         # Loop through the hash of idsrules.
 407         foreach my $rulefile(keys %idsrules) {
 408                 # Check if the rulefile is enabled.
 409                 if ($cgiparams{$rulefile} eq "on") {
 410                         # Add rulefile to the array of enabled rulefiles.
 411                         push(@enabled_rulefiles, $rulefile);
 412
 413                         # Drop item from cgiparams hash.
 414                         delete $cgiparams{$rulefile};
 415                 }
 416         }
 417
 418         # Read-in the files for enabled/disabled sids.
 419         # This will be done by calling the read_enabled_disabled_sids_file function two times
 420         # and merge the returned hashes together into the enabled_disabled_sids hash.
 421         %enabled_disabled_sids = (
 422                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 423                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 424
 425         # Loop through the hash of idsrules.
 426         foreach my $rulefile (keys %idsrules) {
 427                 # Loop through the single rules of the rulefile.
 428                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 429                         # Skip the current sid if it is not numeric.
 430                         next unless ($sid =~ /\d+/ );
 431
 432                         # Check if there exists a key in the cgiparams hash for this sid.
 433                         if (exists($cgiparams{$sid})) {
 434                                 # Look if the rule is disabled.
 435                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 436                                         # Check if the state has been set to 'on'.
 437                                         if ($cgiparams{$sid} eq "on") {
 438                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 439                                                 $enabled_disabled_sids{$sid} = "enabled";
 440
 441                                                 # Drop item from cgiparams hash.
 442                                                 delete $cgiparams{$rulefile}{$sid};
 443                                         }
 444                                 }
 445                         } else {
 446                                 # Look if the rule is enabled.
 447                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 448                                         # Check if the state is 'on' and should be disabled.
 449                                         # In this case there is no entry
 450                                         # for the sid in the cgiparams hash.
 451                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 452                                         $enabled_disabled_sids{$sid} = "disabled";
 453
 454                                         # Drop item from cgiparams hash.
 455                                         delete $cgiparams{$rulefile}{$sid};
 456                                 }
 457                         }
 458                 }
 459         }
 460
 461         # Open enabled sid's file for writing.
 462         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 463
 464         # Open disabled sid's file for writing.
 465         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 466
 467         # Write header to the files.
 468         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 469         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 470
 471         # Check if the hash for enabled/disabled files contains any entries.
 472         if (%enabled_disabled_sids) {
 473                 # Loop through the hash.
 474                 foreach my $sid (keys %enabled_disabled_sids) {
 475                         # Check if the sid is enabled.
 476                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 477                                 # Print the sid to the enabled_sids file.
 478                                 print ENABLED_FILE "enablesid $sid\n";
 479                         # Check if the sid is disabled.
 480                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 481                                 # Print the sid to the disabled_sids file.
 482                                 print DISABLED_FILE "disablesid $sid\n";
 483                         # Something strange happende - skip the current sid.
 484                         } else {
 485                                 next;
 486                         }
 487                 }
 488         }
 489
 490         # Close file for enabled_sids after writing.
 491         close(ENABLED_FILE);
 492
 493         # Close file for disabled_sids after writing.
 494         close(DISABLED_FILE);
 495
 496         # Call function to generate and write the used rulefiles file.
 497         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 498
 499         # Lock the webpage and print message.
 500         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 501
 502         # Call oinkmaster to alter the ruleset.
 503         &IDS::oinkmaster();
 504
 505         # Check if the IDS is running.
 506         if(&IDS::ids_is_running()) {
 507                 # Call suricatactrl to perform a reload.
 508                 &IDS::call_suricatactrl("reload");
 509         }
 510
 511         # Reload page.
 512         &reload();
 513
 514 # Download new ruleset.
 515 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 516         # Check if the red device is active.
 517         unless (-e "${General::swroot}/red/active") {
 518                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 519         }
 520
 521         # Check if enought free disk space is availabe.
 522         if(&IDS::checkdiskspace()) {
 523                 $errormessage = "$Lang::tr{'not enough disk space'}";
 524         }
 525
 526         # Check if any errors happend.
 527         unless ($errormessage) {
 528                 # Lock the webpage and print notice about downloading
 529                 # a new ruleset.
 530                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 531
 532                 # Call subfunction to download the ruleset.
 533                 if(&IDS::downloadruleset()) {
 534                         $errormessage = $Lang::tr{'could not download latest updates'};
 535
 536                         # Call function to store the errormessage.
 537                         &IDS::_store_error_message($errormessage);
 538
 539                         # Preform a reload of the page.
 540                         &reload();
 541                 } else {
 542                         # Call subfunction to launch oinkmaster.
 543                         &IDS::oinkmaster();
 544
 545                         # Check if the IDS is running.
 546                         if(&IDS::ids_is_running()) {
 547                                 # Call suricatactrl to perform a reload.
 548                                 &IDS::call_suricatactrl("reload");
 549                         }
 550
 551                         # Perform a reload of the page.
 552                         &reload();
 553                 }
 554         }
 555 # Save IDS settings.
 556 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 557         my %oldidssettings;
 558         my $reload_page;
 559         my $monitored_zones = 0;
 560
 561         # Read-in current (old) IDS settings.
 562         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 563
 564         # Prevent form name from been stored in conf file.
 565         delete $cgiparams{'IDS'};
 566
 567         # Check if the IDS should be enabled.
 568         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 569                 # Check if any ruleset is available. Otherwise abort and display an error.
 570                 unless(%idsrules) {
 571                         $errormessage = $Lang::tr{'ids no ruleset available'};
 572                 }
 573
 574                 # Loop through the array of available interfaces.
 575                 foreach my $zone (@network_zones) {
 576                         # Convert interface name into upper case.
 577                         my $zone_upper = uc($zone);
 578
 579                         # Check if the IDS is enabled for this interaces.
 580                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 581                                 # Increase count.
 582                                 $monitored_zones++;
 583                         }
 584                 }
 585
 586                 # Check if at least one zone should be monitored, or show an error.
 587                 unless ($monitored_zones >= 1) {
 588                         $errormessage = $Lang::tr{'ids no network zone'};
 589                 }
 590         }
 591
 592         # Go on if there are no error messages.
 593         if (!$errormessage) {
 594                 # Store settings into settings file.
 595                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 596         }
 597
 598         # Generate file to store the home net.
 599         &IDS::generate_home_net_file();
 600
 601         # Temporary variable to set the ruleaction.
 602         # Default is "drop" to use suricata as IPS.
 603         my $ruleaction="drop";
 604
 605         # Check if the traffic only should be monitored.
 606         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
 607                 # Switch the ruleaction to "alert".
 608                 # Suricata acts as an IDS only.
 609                 $ruleaction="alert";
 610         }
 611
 612         # Write the modify sid's file and pass the taken ruleaction.
 613         &IDS::write_modify_sids_file($ruleaction);
 614
 615         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 616         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 617                 # Check if a ruleset exists.
 618                 if (%idsrules) {
 619                         # Lock the webpage and print message.
 620                         &working_notice("$Lang::tr{'ids working'}");
 621
 622                         # Call oinkmaster to alter the ruleset.
 623                         &IDS::oinkmaster();
 624
 625                         # Set reload_page to "True".
 626                         $reload_page="True";
 627                 }
 628         }
 629
 630         # Check if the IDS currently is running.
 631         if(&IDS::ids_is_running()) {
 632                 # Check if ENABLE_IDS is set to on.
 633                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 634                         # Call suricatactrl to perform a reload of suricata.
 635                         &IDS::call_suricatactrl("reload");
 636                 } else {
 637                         # Call suricatactrl to stop suricata.
 638                         &IDS::call_suricatactrl("stop");
 639                 }
 640         } else {
 641                 # Call suricatactrl to start suricata.
 642                 &IDS::call_suricatactrl("start");
 643         }
 644
 645         # Check if the page should be reloaded.
 646         if ($reload_page) {
 647                 # Perform a reload of the page.
 648                 &reload();
 649         }
 650 }
 651
 652 # Read-in idssettings and rulesetsettings
 653 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 654 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 655
 656 # If no autoupdate intervall has been configured yet, set default value.
 657 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 658         # Set default to "weekly".
 659         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 660 }
 661
 662 # Read-in ignored hosts.
 663 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 664
 665 $checked{'ENABLE_IDS'}{'off'} = '';
 666 $checked{'ENABLE_IDS'}{'on'} = '';
 667 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 668 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 669 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 670 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 671 $selected{'RULES'}{'nothing'} = '';
 672 $selected{'RULES'}{'community'} = '';
 673 $selected{'RULES'}{'emerging'} = '';
 674 $selected{'RULES'}{'registered'} = '';
 675 $selected{'RULES'}{'subscripted'} = '';
 676 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 677 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 678 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 679 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 680 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 681
 682 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 683
 684 ### Java Script ###
 685 print"<script>\n";
 686
 687 # Java script variable declaration for show and hide.
 688 print"var show = \"$Lang::tr{'ids show'}\"\;\n";
 689 print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
 690
 691 print <<END
 692         // JQuery function to show/hide the text input field for
 693         // Oinkcode/Subscription code.
 694         \$(function() {
 695                 \$('#RULES').change(function(){
 696                         if(\$('#RULES').val() == 'registered') {
 697                                 \$('#code').show();
 698                         } else if(\$('#RULES').val() == 'subscripted') {
 699                                 \$('#code').show();
 700                         } else if(\$('#RULES').val() == 'emerging_pro') {
 701                                 \$('#code').show();
 702                         } else {
 703                                 \$('#code').hide();
 704                         }
 705                 });
 706         });
 707
 708         // Tiny java script function to show/hide the rules
 709         // of a given category.
 710         function showhide(tblname) {
 711                 \$("#" + tblname).toggle();
 712
 713                 // Get current content of the span element.
 714                 var content = document.getElementById("span_" + tblname);
 715
 716                 if (content.innerHTML === show) {
 717                         content.innerHTML = hide;
 718                 } else {
 719                         content.innerHTML = show;
 720                 }
 721         }
 722 </script>
 723 END
 724 ;
 725
 726 &Header::openbigbox('100%', 'left', '', $errormessage);
 727
 728 if ($errormessage) {
 729         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 730         print "<class name='base'>$errormessage\n";
 731         print "&nbsp;</class>\n";
 732         &Header::closebox();
 733 }
 734
 735 # Draw current state of the IDS
 736 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 737
 738 # Check if the IDS is running and obtain the process-id.
 739 my $pid = &IDS::ids_is_running();
 740
 741 # Display some useful information, if suricata daemon is running.
 742 if ($pid) {
 743         # Gather used memory.
 744         my $memory = &get_memory_usage($pid);
 745
 746         print <<END;
 747                 <table width='95%' cellspacing='0' class='tbl'>
 748                         <tr>
 749                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 750                         </tr>
 751
 752                         <tr>
 753                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 754                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 755                         </tr>
 756
 757                         <tr>
 758                                 <td class='base'></td>
 759                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 760                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 761                         </tr>
 762
 763                         <tr>
 764                                 <td class='base'></td>
 765                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 766                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 767                         </tr>
 768                 </table>
 769 END
 770 } else {
 771         # Otherwise display a hint that the service is not launched.
 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'>$Lang::tr{'guardian daemon'}</td>
 780                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 781                         </tr>
 782                 </table>
 783 END
 784 }
 785
 786 my $rulesdate;
 787
 788 # Check if a ruleset allready has been downloaded.
 789 if ( -f "$IDS::rulestarball"){
 790         # Call stat on the filename to obtain detailed information.
 791         my @Info = stat("$IDS::rulestarball");
 792
 793         # Grab details about the creation time.
 794         $rulesdate = localtime($Info[9]);
 795 }
 796
 797 # Only show this area, if a ruleset is present.
 798 if (%idsrules) {
 799
 800         print <<END
 801
 802         <br><br><h2>$Lang::tr{'settings'}</h2>
 803
 804         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 805                 <table width='100%' border='0'>
 806                         <tr>
 807                                 <td class='base' colspan='2'>
 808                                         <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 809                                 </td>
 810
 811                                 <td class='base' colspan='2'>
 812                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 813                         </td>
 814                         </tr>
 815
 816                         <tr>
 817                                 <td><br><br></td>
 818                                 <td><br><br></td>
 819                                 <td><br><br></td>
 820                                 <td><br><br></td>
 821                         </tr>
 822
 823                         <tr>
 824                                 <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 825                         </tr>
 826
 827                         <tr>
 828 END
 829 ;
 830
 831         # Loop through the array of available networks and print config options.
 832         foreach my $zone (@network_zones) {
 833                 my $checked_input;
 834                 my $checked_forward;
 835
 836                 # Convert current zone name to upper case.
 837                 my $zone_upper = uc($zone);
 838
 839                 # Set zone name.
 840                 my $zone_name = $zone;
 841
 842                 # Dirty hack to get the correct language string for the red zone.
 843                 if ($zone eq "red") {
 844                         $zone_name = "red1";
 845                 }
 846
 847                 # Grab checkbox status from settings hash.
 848                 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 849                         $checked_input = "checked = 'checked'";
 850                 }
 851
 852                 print "<td class='base' width='25%'>\n";
 853                 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 854                 print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 855                 print "</td>\n";
 856         }
 857
 858 print <<END
 859                         </tr>
 860                 </table>
 861
 862                 <br><br>
 863
 864                 <table width='100%'>
 865                         <tr>
 866                                 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 867                         </tr>
 868                 </table>
 869         </form>
 870 END
 871 ;
 872
 873 }
 874
 875 &Header::closebox();
 876
 877 # Draw elements for ruleset configuration.
 878 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 879
 880 print <<END
 881 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 882         <table width='100%' border='0'>
 883                 <tr>
 884                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 885                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 886                 </tr>
 887
 888                 <tr>
 889                         <td><select name='RULES' id='RULES'>
 890                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 891                                 <option value='emerging_pro' $selected{'RULES'}{'emerging_pro'} >$Lang::tr{'emerging pro rules'}</option>
 892                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 893                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 894                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 895                         </select>
 896                         </td>
 897
 898                         <td>
 899                                 <select name='AUTOUPDATE_INTERVAL'>
 900                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 901                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 902                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 903                                 </select>
 904                         </td>
 905                 </tr>
 906
 907                 <tr>
 908                         <td colspan='2'><br><br></td>
 909                 </tr>
 910
 911                 <tr style='display:none' id='code'>
 912                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 913                 </tr>
 914
 915                 <tr>
 916                         <td>&nbsp;</td>
 917
 918                         <td align='right'>
 919 END
 920 ;
 921                         # Show the "Update Ruleset"-Button only if a ruleset has been downloaded yet and automatic updates are disabled.
 922                         if ((%idsrules) && ($rulessettings{'AUTOUPDATE_INTERVAL'} eq "off")) {
 923                                 # Display button to update the ruleset.
 924                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 925                 }
 926 print <<END;
 927                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 928                         </td>
 929
 930                 </tr>
 931         </table>
 932 </form>
 933 END
 934 ;
 935
 936 &Header::closebox();
 937
 938 #
 939 # Whitelist / Ignorelist
 940 #
 941 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 942
 943 print <<END;
 944         <table width='100%'>
 945                 <tr>
 946                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 947                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 948                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 949                 </tr>
 950 END
 951                 # Check if some hosts have been added to be ignored.
 952                 if (keys (%ignored)) {
 953                         my $col = "";
 954
 955                         # Loop through all entries of the hash.
 956                         while( (my $key) = each %ignored)  {
 957                                 # Assign data array positions to some nice variable names.
 958                                 my $address = $ignored{$key}[0];
 959                                 my $remark = $ignored{$key}[1];
 960                                 my $status  = $ignored{$key}[2];
 961
 962                                 # Check if the key (id) number is even or not.
 963                                 if ($cgiparams{'ID'} eq $key) {
 964                                         $col="bgcolor='${Header::colouryellow}'";
 965                                 } elsif ($key % 2) {
 966                                         $col="bgcolor='$color{'color22'}'";
 967                                 } else {
 968                                         $col="bgcolor='$color{'color20'}'";
 969                                 }
 970
 971                                 # Choose icon for the checkbox.
 972                                 my $gif;
 973                                 my $gdesc;
 974
 975                                 # Check if the status is enabled and select the correct image and description.
 976                                 if ($status eq 'enabled' ) {
 977                                         $gif = 'on.gif';
 978                                         $gdesc = $Lang::tr{'click to disable'};
 979                                 } else {
 980                                         $gif = 'off.gif';
 981                                         $gdesc = $Lang::tr{'click to enable'};
 982                                 }
 983
 984 print <<END;
 985                                 <tr>
 986                                         <td width='20%' class='base' $col>$address</td>
 987                                         <td width='65%' class='base' $col>$remark</td>
 988
 989                                         <td align='center' $col>
 990                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 991                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 992                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 993                                                         <input type='hidden' name='ID' value='$key' />
 994                                                 </form>
 995                                         </td>
 996
 997                                         <td align='center' $col>
 998                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 999                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
1000                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
1001                                                         <input type='hidden' name='ID' value='$key' />
1002                                                 </form>
1003                                         </td>
1004
1005                                         <td align='center' $col>
1006                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1007                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1008                                                         <input type='hidden' name='ID' value='$key'>
1009                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1010                                                 </form>
1011                                         </td>
1012                                 </tr>
1013 END
1014                         }
1015                 } else {
1016                         # Print notice that currently no hosts are ignored.
1017                         print "<tr>\n";
1018                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1019                         print "</tr>\n";
1020                 }
1021
1022         print "</table>\n";
1023
1024         # Section to add new elements or edit existing ones.
1025 print <<END;
1026         <br>
1027         <hr>
1028         <br>
1029
1030         <div align='center'>
1031                 <table width='100%'>
1032 END
1033
1034         # Assign correct headline and button text.
1035         my $buttontext;
1036         my $entry_address;
1037         my $entry_remark;
1038
1039         # Check if an ID (key) has been given, in this case an existing entry should be edited.
1040         if ($cgiparams{'ID'} ne '') {
1041                 $buttontext = $Lang::tr{'update'};
1042                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1043
1044                         # Grab address and remark for the given key.
1045                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1046                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1047                 } else {
1048                         $buttontext = $Lang::tr{'add'};
1049                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1050                 }
1051
1052 print <<END;
1053                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1054                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1055                         <tr>
1056                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1057                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1058
1059                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1060                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1061                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1062                         </tr>
1063                         </form>
1064                 </table>
1065         </div>
1066 END
1067
1068 &Header::closebox();
1069
1070 # Only show the section for configuring the ruleset if one is present.
1071 if (%idsrules) {
1072         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
1073
1074                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1075
1076                 # Output display table for rule files
1077                 print "<table width='100%'>\n";
1078
1079                 # Loop over each rule file
1080                 foreach my $rulefile (sort keys(%idsrules)) {
1081                         my $rulechecked = '';
1082
1083                         # Check if rule file is enabled
1084                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1085                                 $rulechecked = 'CHECKED';
1086                         }
1087
1088                         # Convert rulefile name into category name.
1089                         my $categoryname = &_rulefile_to_category($rulefile);
1090
1091                         # Table and rows for the rule files.
1092                         print"<tr>\n";
1093                         print"<td class='base' width='5%'>\n";
1094                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1095                         print"</td>\n";
1096                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1097                         print"<td class='base' width='5%' align='right'>\n";
1098                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1099                         print"</td>\n";
1100                         print"</tr>\n";
1101
1102                         # Rows which will be hidden per default and will contain the single rules.
1103                         print"<tr  style='display:none' id='$categoryname'>\n";
1104                         print"<td colspan='3'>\n";
1105
1106                         # Local vars
1107                         my $lines;
1108                         my $rows;
1109                         my $col;
1110
1111                         # New table for the single rules.
1112                         print "<table width='100%'>\n";
1113
1114                         # Loop over rule file rules
1115                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1116                                 # Local vars
1117                                 my $ruledefchecked = '';
1118
1119                                 # Skip rulefile itself.
1120                                 next if ($sid eq "Rulefile");
1121
1122                                 # If 2 rules have been displayed, start a new row
1123                                 if (($lines % 2) == 0) {
1124                                         print "</tr><tr>\n";
1125
1126                                         # Increase rows by once.
1127                                         $rows++;
1128                                 }
1129
1130                                 # Colour lines.
1131                                 if ($rows % 2) {
1132                                         $col="bgcolor='$color{'color20'}'";
1133                                 } else {
1134                                         $col="bgcolor='$color{'color22'}'";
1135                                 }
1136
1137                                 # Set rule state
1138                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1139                                         $ruledefchecked = 'CHECKED';
1140                                 }
1141
1142                                 # Create rule checkbox and display rule description
1143                                 print "<td class='base' width='5%' align='right' $col>\n";
1144                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1145                                 print "</td>\n";
1146                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1147
1148                                 # Increment rule count
1149                                 $lines++;
1150                         }
1151
1152                         # If do not have a second rule for row, create empty cell
1153                         if (($lines % 2) != 0) {
1154                                 print "<td class='base'></td>";
1155                         }
1156
1157                         # Close display table
1158                         print "</tr></table></td></tr>";
1159                 }
1160
1161                 # Close display table
1162                 print "</table>";
1163
1164 print <<END
1165 <table width='100%'>
1166 <tr>
1167         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1168                 &nbsp; <!-- space for future online help link -->
1169         </td>
1170 </tr>
1171 </table>
1172 </form>
1173 END
1174 ;
1175         &Header::closebox();
1176 }
1177
1178 &Header::closebigbox();
1179 &Header::closepage();
1180
1181 #
1182 ## A function to display a notice, to lock the webpage and
1183 ## tell the user which action currently will be performed.
1184 #
1185 sub working_notice ($) {
1186         my ($message) = @_;
1187
1188         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1189         &Header::openbigbox('100%', 'left', '', $errormessage);
1190         &Header::openbox( 'Waiting', 1,);
1191                 print <<END;
1192                         <table>
1193                                 <tr>
1194                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1195                                         <td>$message</td>
1196                                 </tr>
1197                         </table>
1198 END
1199         &Header::closebox();
1200         &Header::closebigbox();
1201         &Header::closepage();
1202 }
1203
1204 #
1205 ## A tiny function to perform a reload of the webpage after one second.
1206 #
1207 sub reload () {
1208         print "<meta http-equiv='refresh' content='1'>\n";
1209
1210         # Stop the script.
1211         exit;
1212 }
1213
1214 #
1215 ## Private function to read-in and parse rules of a given rulefile.
1216 #
1217 ## The given file will be read, parsed and all valid rules will be stored by ID,
1218 ## message/description and it's state in the idsrules hash.
1219 #
1220 sub readrulesfile ($) {
1221         my $rulefile = shift;
1222
1223         # Open rule file and read in contents
1224         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1225
1226         # Store file content in an array.
1227         my @lines = <RULEFILE>;
1228
1229         # Close file.
1230         close(RULEFILE);
1231
1232         # Loop over rule file contents
1233         foreach my $line (@lines) {
1234                 # Remove whitespaces.
1235                 chomp $line;
1236
1237                 # Skip blank  lines.
1238                 next if ($line =~ /^\s*$/);
1239
1240                 # Local vars.
1241                 my $sid;
1242                 my $msg;
1243
1244                 # Gather rule sid and message from the ruleline.
1245                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1246                         $msg = $1;
1247                         $sid = $2;
1248
1249                         # Check if a rule has been found.
1250                         if ($sid && $msg) {
1251                                 # Add rule to the idsrules hash.
1252                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1253
1254                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1255                                 if ($line =~ /^\#/) {
1256                                         # If yes, the rule is disabled.
1257                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1258                                 } else {
1259                                         # Otherwise the rule is enabled.
1260                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1261                                 }
1262                         }
1263                 }
1264         }
1265 }
1266
1267 #
1268 ## Function to get the used memory of a given process-id.
1269 #
1270 sub get_memory_usage($) {
1271         my ($pid) = @_;
1272
1273         my $memory = 0;
1274
1275         # Try to open the status file for the given process-id on the pseudo
1276         # file system proc.
1277         if (open(FILE, "/proc/$pid/status")) {
1278                 # Loop through the entire file.
1279                 while (<FILE>) {
1280                         # Splitt current line content and store them into variables.
1281                         my ($key, $value) = split(":", $_, 2);
1282
1283                         # Check if the current key is the one which contains the memory usage.
1284                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1285                         # of the entire process.
1286                         if ($key eq "VmRSS") {
1287                                 # Found the memory usage add it to the memory variable.
1288                                 $memory += $value;
1289
1290                                 # Break the loop.
1291                                 last;
1292                         }
1293                 }
1294
1295                 # Close file handle.
1296                 close(FILE);
1297
1298                 # Return memory usage.
1299                 return $memory;
1300         }
1301
1302         # If the file could not be open, return nothing.
1303         return;
1304 }
1305
1306 #
1307 ## Function to read-in the given enabled or disables sids file.
1308 #
1309 sub read_enabled_disabled_sids_file($) {
1310         my ($file) = @_;
1311
1312         # Temporary hash to store the sids and their state. It will be
1313         # returned at the end of this function.
1314         my %temphash;
1315
1316         # Open the given filename.
1317         open(FILE, "$file") or die "Could not open $file. $!\n";
1318
1319         # Loop through the file.
1320         while(<FILE>) {
1321                 # Remove newlines.
1322                 chomp $_;
1323
1324                 # Skip blank lines.
1325                 next if ($_ =~ /^\s*$/);
1326
1327                 # Skip coments.
1328                 next if ($_ =~ /^\#/);
1329
1330                 # Splitt line into sid and state part.
1331                 my ($state, $sid) = split(" ", $_);
1332
1333                 # Skip line if the sid is not numeric.
1334                 next unless ($sid =~ /\d+/ );
1335
1336                 # Check if the sid was enabled.
1337                 if ($state eq "enablesid") {
1338                         # Add the sid and its state as enabled to the temporary hash.
1339                         $temphash{$sid} = "enabled";
1340                 # Check if the sid was disabled.
1341                 } elsif ($state eq "disablesid") {
1342                         # Add the sid and its state as disabled to the temporary hash.
1343                         $temphash{$sid} = "disabled";
1344                 # Invalid state - skip the current sid and state.
1345                 } else {
1346                         next;
1347                 }
1348         }
1349
1350         # Close filehandle.
1351         close(FILE);
1352
1353         # Return the hash.
1354         return %temphash;
1355 }
1356
1357 #
1358 ## Private function to convert a given rulefile to a category name.
1359 ## ( No file extension anymore and if the name contained a dot, it
1360 ## would be replaced by a underline sign.)
1361 #
1362 sub _rulefile_to_category($) {
1363         my ($filename) = @_;
1364
1365         # Splitt the filename into single chunks and store them in a
1366         # temorary array.
1367         my @parts = split(/\./, $filename);
1368
1369         # Return / Remove last element of the temporary array.
1370         # This removes the file extension.
1371         pop @parts;
1372
1373         # Join together the single elements of the temporary array.
1374         # If these are more than one, use a "underline" for joining.
1375         my $category = join '_', @parts;
1376
1377         # Return the converted filename.
1378         return $category;
1379 }