html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2020  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32 require "${General::swroot}/network-functions.pl";
  33
  34 # Import ruleset providers file.
  35 require "$IDS::rulesetsourcesfile";
  36
  37 my %color = ();
  38 my %mainsettings = ();
  39 my %idsrules = ();
  40 my %idssettings=();
  41 my %rulessettings=();
  42 my %rulesetsources = ();
  43 my %cgiparams=();
  44 my %checked=();
  45 my %selected=();
  46 my %ignored=();
  47
  48 # Read-in main settings, for language, theme and colors.
  49 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  50 &General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
  51
  52 # Get the available network zones, based on the config type of the system and store
  53 # the list of zones in an array.
  54 my @network_zones = &Network::get_available_network_zones();
  55
  56 # Check if openvpn is started and add it to the array of network zones.
  57 if ( -e "/var/run/openvpn.pid") {
  58         push(@network_zones, "ovpn");
  59 }
  60
  61 my $errormessage;
  62
  63 # Create files if they does not exist yet.
  64 &IDS::check_and_create_filelayout();
  65
  66 # Hash which contains the colour code of a network zone.
  67 my %colourhash = (
  68         'red' => $Header::colourred,
  69         'green' => $Header::colourgreen,
  70         'blue' => $Header::colourblue,
  71         'orange' => $Header::colourorange,
  72         'ovpn' => $Header::colourovpn
  73 );
  74
  75 &Header::showhttpheaders();
  76
  77 #Get GUI values
  78 &Header::getcgihash(\%cgiparams);
  79
  80 ## Add/edit an entry to the ignore file.
  81 #
  82 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  83
  84         # Check if any input has been performed.
  85         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  86
  87                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  88                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  89                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  90                 }
  91         } else {
  92                 $errormessage = "$Lang::tr{'guardian empty input'}";
  93         }
  94
  95         # Go further if there was no error.
  96         if ($errormessage eq '') {
  97                 my %ignored = ();
  98                 my $id;
  99                 my $status;
 100
 101                 # Assign hash values.
 102                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 103                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 104
 105                 # Read-in ignoredfile.
 106                 &General::readhasharray($IDS::ignored_file, \%ignored);
 107
 108                 # Check if we should edit an existing entry and got an ID.
 109                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 110                         # Assin the provided id.
 111                         $id = $cgiparams{'ID'};
 112
 113                         # Undef the given ID.
 114                         undef($cgiparams{'ID'});
 115
 116                         # Grab the configured status of the corresponding entry.
 117                         $status = $ignored{$id}[2];
 118                 } else {
 119                         # Each newly added entry automatically should be enabled.
 120                         $status = "enabled";
 121
 122                         # Generate the ID for the new entry.
 123                         #
 124                         # Sort the keys by their ID and store them in an array.
 125                         my @keys = sort { $a <=> $b } keys %ignored;
 126
 127                         # Reverse the key array.
 128                         my @reversed = reverse(@keys);
 129
 130                         # Obtain the last used id.
 131                         my $last_id = @reversed[0];
 132
 133                         # Increase the last id by one and use it as id for the new entry.
 134                         $id = ++$last_id;
 135                 }
 136
 137                 # Add/Modify the entry to/in the ignored hash.
 138                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 139
 140                 # Write the changed ignored hash to the ignored file.
 141                 &General::writehasharray($IDS::ignored_file, \%ignored);
 142
 143                 # Regenerate the ignore file.
 144                 &IDS::generate_ignore_file();
 145         }
 146
 147         # Check if the IDS is running.
 148         if(&IDS::ids_is_running()) {
 149                 # Call suricatactrl to perform a reload.
 150                 &IDS::call_suricatactrl("reload");
 151         }
 152
 153 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 154 #
 155
 156 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 157         my %ignored = ();
 158
 159         # Only go further, if an ID has been passed.
 160         if ($cgiparams{'ID'}) {
 161                 # Assign the given ID.
 162                 my $id = $cgiparams{'ID'};
 163
 164                 # Undef the given ID.
 165                 undef($cgiparams{'ID'});
 166
 167                 # Read-in ignoredfile.
 168                 &General::readhasharray($IDS::ignored_file, \%ignored);
 169
 170                 # Grab the configured status of the corresponding entry.
 171                 my $status = $ignored{$id}[2];
 172
 173                 # Switch the status.
 174                 if ($status eq "disabled") {
 175                         $status = "enabled";
 176                 } else {
 177                         $status = "disabled";
 178                 }
 179
 180                 # Modify the status of the existing entry.
 181                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 182
 183                 # Write the changed ignored hash to the ignored file.
 184                 &General::writehasharray($IDS::ignored_file, \%ignored);
 185
 186                 # Regenerate the ignore file.
 187                 &IDS::generate_ignore_file();
 188
 189                 # Check if the IDS is running.
 190                 if(&IDS::ids_is_running()) {
 191                         # Call suricatactrl to perform a reload.
 192                         &IDS::call_suricatactrl("reload");
 193                 }
 194         }
 195
 196 ## Remove entry from ignore list.
 197 #
 198 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 199         my %ignored = ();
 200
 201         # Read-in ignoredfile.
 202         &General::readhasharray($IDS::ignored_file, \%ignored);
 203
 204         # Drop entry from the hash.
 205         delete($ignored{$cgiparams{'ID'}});
 206
 207         # Undef the given ID.
 208         undef($cgiparams{'ID'});
 209
 210         # Write the changed ignored hash to the ignored file.
 211         &General::writehasharray($IDS::ignored_file, \%ignored);
 212
 213         # Regenerate the ignore file.
 214         &IDS::generate_ignore_file();
 215
 216         # Check if the IDS is running.
 217         if(&IDS::ids_is_running()) {
 218                 # Call suricatactrl to perform a reload.
 219                 &IDS::call_suricatactrl("reload");
 220         }
 221 }
 222
 223 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 224 if (-e $IDS::ids_page_lock_file) {
 225         # Lock the webpage and print notice about autoupgrade of the ruleset
 226         # is in progess.
 227         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 228
 229         # Loop and check if the file still exists.
 230         while(-e $IDS::ids_page_lock_file) {
 231                 # Sleep for a second and re-check.
 232                 sleep 1;
 233         }
 234
 235         # Page has been unlocked, perform a reload.
 236         &reload();
 237 }
 238
 239 # Check if any error has been stored.
 240 if (-e $IDS::storederrorfile) {
 241         # Open file to read in the stored error message.
 242         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 243
 244         # Read the stored error message.
 245         $errormessage = <FILE>;
 246
 247         # Close file.
 248         close (FILE);
 249
 250         # Delete the file, which is now not longer required.
 251         unlink($IDS::storederrorfile);
 252 }
 253
 254 ## Grab all available rules and store them in the idsrules hash.
 255 #
 256 # Open rules directory and do a directory listing.
 257 opendir(DIR, $IDS::rulespath) or die $!;
 258         # Loop through the direcory.
 259         while (my $file = readdir(DIR)) {
 260
 261                 # We only want files.
 262                 next unless (-f "$IDS::rulespath/$file");
 263
 264                 # Ignore empty files.
 265                 next if (-z "$IDS::rulespath/$file");
 266
 267                 # Use a regular expression to find files ending in .rules
 268                 next unless ($file =~ m/\.rules$/);
 269
 270                 # Ignore files which are not read-able.
 271                 next unless (-R "$IDS::rulespath/$file");
 272
 273                 # Skip whitelist rules file.
 274                 next if( $file eq "whitelist.rules");
 275
 276                 # Call subfunction to read-in rulefile and add rules to
 277                 # the idsrules hash.
 278                 &readrulesfile("$file");
 279         }
 280
 281 closedir(DIR);
 282
 283 # Gather used rulefiles.
 284 #
 285 # Check if the file for activated rulefiles is not empty.
 286 if(-f $IDS::used_rulefiles_file) {
 287         # Open the file for used rulefile and read-in content.
 288         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 289
 290         # Read-in content.
 291         my @lines = <FILE>;
 292
 293         # Close file.
 294         close(FILE);
 295
 296         # Loop through the array.
 297         foreach my $line (@lines) {
 298                 # Remove newlines.
 299                 chomp($line);
 300
 301                 # Skip comments.
 302                 next if ($line =~ /\#/);
 303
 304                 # Skip blank  lines.
 305                 next if ($line =~ /^\s*$/);
 306
 307                 # Gather rule sid and message from the ruleline.
 308                 if ($line =~ /.*- (.*)/) {
 309                         my $rulefile = $1;
 310
 311                         # Check if the current rulefile exists in the %idsrules hash.
 312                         # If not, the file probably does not exist anymore or contains
 313                         # no rules.
 314                         if($idsrules{$rulefile}) {
 315                                 # Add the rulefile state to the %idsrules hash.
 316                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 317                         }
 318                 }
 319         }
 320 }
 321
 322 # Save ruleset configuration.
 323 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 324         my %oldsettings;
 325         my %rulesetsources;
 326
 327         # Read-in current (old) IDS settings.
 328         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 329
 330         # Prevent form name from been stored in conf file.
 331         delete $cgiparams{'RULESET'};
 332
 333         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 334         if ($IDS::Ruleset::Providers{$cgiparams{'RULES'}}{'requires_subscription'} eq "True") {
 335                 # Check if an subscription/oinkcode has been provided.
 336                 if ($cgiparams{'OINKCODE'}) {
 337                         # Check if the oinkcode contains unallowed chars.
 338                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 339                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 340                         }
 341                 } else {
 342                         # Print an error message, that an subsription/oinkcode is required for this
 343                         # vendor.
 344                         $errormessage = $Lang::tr{'ids oinkcode required'};
 345                 }
 346         }
 347
 348         # Go on if there are no error messages.
 349         if (!$errormessage) {
 350                 # Store settings into settings file.
 351                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 352
 353                 # Check if the the automatic rule update hass been touched.
 354                 if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 355                         # Call suricatactrl to set the new interval.
 356                         &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 357                 }
 358
 359                 # Check if a ruleset is present - if not or the source has been changed download it.
 360                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 361                         # Check if the red device is active.
 362                         unless (-e "${General::swroot}/red/active") {
 363                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 364                         }
 365
 366                         # Check if enough free disk space is availabe.
 367                         if(&IDS::checkdiskspace()) {
 368                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 369                         }
 370
 371                         # Check if any errors happend.
 372                         unless ($errormessage) {
 373                                 # Lock the webpage and print notice about downloading
 374                                 # a new ruleset.
 375                                 &working_notice("$Lang::tr{'ids working'}");
 376
 377                                 # Write the modify sid's file and pass the taken ruleaction.
 378                                 &IDS::write_modify_sids_file();
 379
 380                                 # Call subfunction to download the ruleset.
 381                                 if(&IDS::downloadruleset()) {
 382                                         $errormessage = $Lang::tr{'could not download latest updates'};
 383
 384                                         # Call function to store the errormessage.
 385                                         &IDS::_store_error_message($errormessage);
 386                                 } else {
 387                                         # Call subfunction to launch oinkmaster.
 388                                         &IDS::oinkmaster();
 389                                 }
 390
 391                                 # Check if the IDS is running.
 392                                 if(&IDS::ids_is_running()) {
 393                                         # Call suricatactrl to stop the IDS - because of the changed
 394                                         # ruleset - the use has to configure it before suricata can be
 395                                         # used again.
 396                                         &IDS::call_suricatactrl("stop");
 397                                 }
 398
 399                                 # Perform a reload of the page.
 400                                 &reload();
 401                         }
 402                 }
 403         }
 404
 405 # Save ruleset.
 406 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 407         # Arrays to store which rulefiles have been enabled and will be used.
 408         my @enabled_rulefiles;
 409
 410         # Hash to store the user-enabled and disabled sids.
 411         my %enabled_disabled_sids;
 412
 413         # Store if a restart of suricata is required.
 414         my $suricata_restart_required;
 415
 416         # Loop through the hash of idsrules.
 417         foreach my $rulefile(keys %idsrules) {
 418                 # Check if the state of the rulefile has been changed.
 419                 unless ($cgiparams{$rulefile} eq $idsrules{$rulefile}{'Rulefile'}{'State'}) {
 420                         # A restart of suricata is required to apply the changes of the used rulefiles.
 421                         $suricata_restart_required = 1;
 422                 }
 423
 424                 # Check if the rulefile is enabled.
 425                 if ($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                 # Check if a restart of suricata is required.
 524                 if ($suricata_restart_required) {
 525                         # Call suricatactrl to perform the restart.
 526                         &IDS::call_suricatactrl("restart");
 527                 } else {
 528                         # Call suricatactrl to perform a reload.
 529                         &IDS::call_suricatactrl("reload");
 530                 }
 531         }
 532
 533         # Reload page.
 534         &reload();
 535
 536 # Download new ruleset.
 537 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 538         # Check if the red device is active.
 539         unless (-e "${General::swroot}/red/active") {
 540                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 541         }
 542
 543         # Check if enought free disk space is availabe.
 544         if(&IDS::checkdiskspace()) {
 545                 $errormessage = "$Lang::tr{'not enough disk space'}";
 546         }
 547
 548         # Check if any errors happend.
 549         unless ($errormessage) {
 550                 # Lock the webpage and print notice about downloading
 551                 # a new ruleset.
 552                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 553
 554                 # Call subfunction to download the ruleset.
 555                 if(&IDS::downloadruleset()) {
 556                         $errormessage = $Lang::tr{'could not download latest updates'};
 557
 558                         # Call function to store the errormessage.
 559                         &IDS::_store_error_message($errormessage);
 560
 561                         # Preform a reload of the page.
 562                         &reload();
 563                 } else {
 564                         # Call subfunction to launch oinkmaster.
 565                         &IDS::oinkmaster();
 566
 567                         # Check if the IDS is running.
 568                         if(&IDS::ids_is_running()) {
 569                                 # Call suricatactrl to perform a reload.
 570                                 &IDS::call_suricatactrl("reload");
 571                         }
 572
 573                         # Perform a reload of the page.
 574                         &reload();
 575                 }
 576         }
 577 # Save IDS settings.
 578 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 579         my %oldidssettings;
 580         my $reload_page;
 581         my $monitored_zones = 0;
 582
 583         # Read-in current (old) IDS settings.
 584         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 585
 586         # Prevent form name from been stored in conf file.
 587         delete $cgiparams{'IDS'};
 588
 589         # Check if the IDS should be enabled.
 590         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 591                 # Check if any ruleset is available. Otherwise abort and display an error.
 592                 unless(%idsrules) {
 593                         $errormessage = $Lang::tr{'ids no ruleset available'};
 594                 }
 595
 596                 # Loop through the array of available interfaces.
 597                 foreach my $zone (@network_zones) {
 598                         # Convert interface name into upper case.
 599                         my $zone_upper = uc($zone);
 600
 601                         # Check if the IDS is enabled for this interaces.
 602                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 603                                 # Increase count.
 604                                 $monitored_zones++;
 605                         }
 606                 }
 607
 608                 # Check if at least one zone should be monitored, or show an error.
 609                 unless ($monitored_zones >= 1) {
 610                         $errormessage = $Lang::tr{'ids no network zone'};
 611                 }
 612         }
 613
 614         # Go on if there are no error messages.
 615         if (!$errormessage) {
 616                 # Store settings into settings file.
 617                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 618         }
 619
 620         # Generate file to store the home net.
 621         &IDS::generate_home_net_file();
 622
 623         # Generate file to the store the DNS servers.
 624         &IDS::generate_dns_servers_file();
 625
 626         # Generate file to store the HTTP ports.
 627         &IDS::generate_http_ports_file();
 628
 629         # Write the modify sid's file and pass the taken ruleaction.
 630         &IDS::write_modify_sids_file();
 631
 632         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 633         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 634                 # Check if a ruleset exists.
 635                 if (%idsrules) {
 636                         # Lock the webpage and print message.
 637                         &working_notice("$Lang::tr{'ids working'}");
 638
 639                         # Call oinkmaster to alter the ruleset.
 640                         &IDS::oinkmaster();
 641
 642                         # Set reload_page to "True".
 643                         $reload_page="True";
 644                 }
 645         }
 646
 647         # Check if the IDS currently is running.
 648         if(&IDS::ids_is_running()) {
 649                 # Check if ENABLE_IDS is set to on.
 650                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 651                         # Call suricatactrl to perform a reload of suricata.
 652                         &IDS::call_suricatactrl("reload");
 653                 } else {
 654                         # Call suricatactrl to stop suricata.
 655                         &IDS::call_suricatactrl("stop");
 656                 }
 657         } else {
 658                 # Call suricatactrl to start suricata.
 659                 &IDS::call_suricatactrl("start");
 660         }
 661
 662         # Check if the page should be reloaded.
 663         if ($reload_page) {
 664                 # Perform a reload of the page.
 665                 &reload();
 666         }
 667 }
 668
 669 # Read-in idssettings and rulesetsettings
 670 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 671 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 672
 673 # If no autoupdate intervall has been configured yet, set default value.
 674 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 675         # Set default to "weekly".
 676         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 677 }
 678
 679 # Read-in ignored hosts.
 680 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 681
 682 $checked{'ENABLE_IDS'}{'off'} = '';
 683 $checked{'ENABLE_IDS'}{'on'} = '';
 684 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 685 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 686 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 687 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 688 $selected{'RULES'}{'nothing'} = '';
 689 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 690 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 691 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 692 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 693 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 694
 695 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 696
 697 ### Java Script ###
 698 print"<script>\n";
 699
 700 # Java script variable declaration for show and hide.
 701 print"var show = \"$Lang::tr{'ids show'}\"\;\n";
 702 print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
 703
 704 print <<END
 705         // Java Script function to show/hide the text input field for
 706         // Oinkcode/Subscription code.
 707         var update_code = function() {
 708                 if(\$('#RULES').val() == 'registered') {
 709                         \$('#code').show();
 710                 } else if(\$('#RULES').val() == 'subscripted') {
 711                         \$('#code').show();
 712                 } else if(\$('#RULES').val() == 'emerging_pro') {
 713                         \$('#code').show();
 714                 } else {
 715                         \$('#code').hide();
 716                 }
 717         };
 718
 719         // JQuery function to call corresponding function when
 720         // the ruleset is changed or the page is loaded for showing/hiding
 721         // the code area.
 722         \$(document).ready(function() {
 723                 \$('#RULES').change(update_code);
 724                 update_code();
 725         });
 726
 727         // Tiny java script function to show/hide the rules
 728         // of a given category.
 729         function showhide(tblname) {
 730                 \$("#" + tblname).toggle();
 731
 732                 // Get current content of the span element.
 733                 var content = document.getElementById("span_" + tblname);
 734
 735                 if (content.innerHTML === show) {
 736                         content.innerHTML = hide;
 737                 } else {
 738                         content.innerHTML = show;
 739                 }
 740         }
 741 </script>
 742 END
 743 ;
 744
 745 &Header::openbigbox('100%', 'left', '', $errormessage);
 746
 747 if ($errormessage) {
 748         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 749         print "<class name='base'>$errormessage\n";
 750         print "&nbsp;</class>\n";
 751         &Header::closebox();
 752 }
 753
 754 # Draw current state of the IDS
 755 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 756
 757 # Check if the IDS is running and obtain the process-id.
 758 my $pid = &IDS::ids_is_running();
 759
 760 # Display some useful information, if suricata daemon is running.
 761 if ($pid) {
 762         # Gather used memory.
 763         my $memory = &get_memory_usage($pid);
 764
 765         print <<END;
 766                 <table width='95%' cellspacing='0' class='tbl'>
 767                         <tr>
 768                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 769                         </tr>
 770
 771                         <tr>
 772                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 773                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 774                         </tr>
 775
 776                         <tr>
 777                                 <td class='base'></td>
 778                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 779                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 780                         </tr>
 781
 782                         <tr>
 783                                 <td class='base'></td>
 784                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 785                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 786                         </tr>
 787                 </table>
 788 END
 789 } else {
 790         # Otherwise display a hint that the service is not launched.
 791         print <<END;
 792                 <table width='95%' cellspacing='0' class='tbl'>
 793                         <tr>
 794                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 795                         </tr>
 796
 797                         <tr>
 798                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 799                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 800                         </tr>
 801                 </table>
 802 END
 803 }
 804
 805 # Only show this area, if a ruleset is present.
 806 if (%idsrules) {
 807
 808         print <<END
 809
 810         <br><br><h2>$Lang::tr{'settings'}</h2>
 811
 812         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 813                 <table width='100%' border='0'>
 814                         <tr>
 815                                 <td class='base' colspan='2'>
 816                                         <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 817                                 </td>
 818
 819                                 <td class='base' colspan='2'>
 820                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 821                         </td>
 822                         </tr>
 823
 824                         <tr>
 825                                 <td><br><br></td>
 826                                 <td><br><br></td>
 827                                 <td><br><br></td>
 828                                 <td><br><br></td>
 829                         </tr>
 830
 831                         <tr>
 832                                 <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 833                         </tr>
 834
 835                         <tr>
 836 END
 837 ;
 838
 839         # Loop through the array of available networks and print config options.
 840         foreach my $zone (@network_zones) {
 841                 my $checked_input;
 842                 my $checked_forward;
 843
 844                 # Convert current zone name to upper case.
 845                 my $zone_upper = uc($zone);
 846
 847                 # Set zone name.
 848                 my $zone_name = $zone;
 849
 850                 # Dirty hack to get the correct language string for the red zone.
 851                 if ($zone eq "red") {
 852                         $zone_name = "red1";
 853                 }
 854
 855                 # Grab checkbox status from settings hash.
 856                 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 857                         $checked_input = "checked = 'checked'";
 858                 }
 859
 860                 print "<td class='base' width='20%'>\n";
 861                 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 862                 print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 863                 print "</td>\n";
 864         }
 865
 866 print <<END
 867                         </tr>
 868                 </table>
 869
 870                 <br><br>
 871
 872                 <table width='100%'>
 873                         <tr>
 874                                 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 875                         </tr>
 876                 </table>
 877         </form>
 878 END
 879 ;
 880
 881 }
 882
 883 &Header::closebox();
 884
 885 # Draw elements for ruleset configuration.
 886 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 887
 888 print <<END
 889 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 890         <table width='100%' border='0'>
 891                 <tr>
 892                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 893                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 894                 </tr>
 895
 896                 <tr>
 897                         <td><select name='RULES' id='RULES'>
 898 END
 899 ;
 900                         # Get all available ruleset providers.
 901                         my @ruleset_providers = &IDS::get_ruleset_providers();
 902
 903                         # Loop throgh the list of providers.
 904                         foreach my $provider (@ruleset_providers) {
 905                                 my $option_string;
 906
 907                                 # Get the translation required string for the current provider.
 908                                 my $tr_string = $IDS::Ruleset::Providers{$provider}{'tr_string'};
 909
 910                                 # Check if a translation string is available in the language files.
 911                                 if ($Lang::tr{$tr_string}) {
 912                                         # Use the translated string from the language file.
 913                                         $option_string = $Lang::tr{$tr_string};
 914                                 } else {
 915                                         # Fallback and use the provider summary from the providers file.
 916                                         $option_string = $IDS::Ruleset::Providers{$provider}{'summary'};
 917                                 }
 918
 919                                 print "<option value='$provider' $selected{'RULES'}{$provider}>$option_string</option>\n";
 920                         }
 921 print <<END;
 922                         </select>
 923                         </td>
 924
 925                         <td>
 926                                 <select name='AUTOUPDATE_INTERVAL'>
 927                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 928                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 929                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 930                                 </select>
 931                         </td>
 932                 </tr>
 933
 934                 <tr>
 935                         <td colspan='2'><br><br></td>
 936                 </tr>
 937
 938                 <tr style='display:none' id='code'>
 939                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 940                 </tr>
 941
 942                 <tr>
 943                         <td>&nbsp;</td>
 944
 945                         <td align='right'>
 946 END
 947 ;
 948                         # Show the "Update Ruleset"-Button only if a ruleset has been downloaded yet and automatic updates are disabled.
 949                         if ((%idsrules) && ($rulessettings{'AUTOUPDATE_INTERVAL'} eq "off")) {
 950                                 # Display button to update the ruleset.
 951                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 952                 }
 953 print <<END;
 954                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 955                         </td>
 956
 957                 </tr>
 958         </table>
 959 </form>
 960 END
 961 ;
 962
 963 &Header::closebox();
 964
 965 #
 966 # Whitelist / Ignorelist
 967 #
 968 &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
 969
 970 print <<END;
 971         <table width='100%'>
 972                 <tr>
 973                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 974                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 975                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 976                 </tr>
 977 END
 978                 # Check if some hosts have been added to be ignored.
 979                 if (keys (%ignored)) {
 980                         my $col = "";
 981
 982                         # Loop through all entries of the hash.
 983                         while( (my $key) = each %ignored)  {
 984                                 # Assign data array positions to some nice variable names.
 985                                 my $address = $ignored{$key}[0];
 986                                 my $remark = $ignored{$key}[1];
 987                                 my $status  = $ignored{$key}[2];
 988
 989                                 # Check if the key (id) number is even or not.
 990                                 if ($cgiparams{'ID'} eq $key) {
 991                                         $col="bgcolor='${Header::colouryellow}'";
 992                                 } elsif ($key % 2) {
 993                                         $col="bgcolor='$color{'color22'}'";
 994                                 } else {
 995                                         $col="bgcolor='$color{'color20'}'";
 996                                 }
 997
 998                                 # Choose icon for the checkbox.
 999                                 my $gif;
1000                                 my $gdesc;
1001
1002                                 # Check if the status is enabled and select the correct image and description.
1003                                 if ($status eq 'enabled' ) {
1004                                         $gif = 'on.gif';
1005                                         $gdesc = $Lang::tr{'click to disable'};
1006                                 } else {
1007                                         $gif = 'off.gif';
1008                                         $gdesc = $Lang::tr{'click to enable'};
1009                                 }
1010
1011 print <<END;
1012                                 <tr>
1013                                         <td width='20%' class='base' $col>$address</td>
1014                                         <td width='65%' class='base' $col>$remark</td>
1015
1016                                         <td align='center' $col>
1017                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1018                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
1019                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
1020                                                         <input type='hidden' name='ID' value='$key' />
1021                                                 </form>
1022                                         </td>
1023
1024                                         <td align='center' $col>
1025                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1026                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
1027                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
1028                                                         <input type='hidden' name='ID' value='$key' />
1029                                                 </form>
1030                                         </td>
1031
1032                                         <td align='center' $col>
1033                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1034                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1035                                                         <input type='hidden' name='ID' value='$key'>
1036                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1037                                                 </form>
1038                                         </td>
1039                                 </tr>
1040 END
1041                         }
1042                 } else {
1043                         # Print notice that currently no hosts are ignored.
1044                         print "<tr>\n";
1045                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1046                         print "</tr>\n";
1047                 }
1048
1049         print "</table>\n";
1050
1051         # Section to add new elements or edit existing ones.
1052 print <<END;
1053         <br>
1054         <hr>
1055         <br>
1056
1057         <div align='center'>
1058                 <table width='100%'>
1059 END
1060
1061         # Assign correct headline and button text.
1062         my $buttontext;
1063         my $entry_address;
1064         my $entry_remark;
1065
1066         # Check if an ID (key) has been given, in this case an existing entry should be edited.
1067         if ($cgiparams{'ID'} ne '') {
1068                 $buttontext = $Lang::tr{'update'};
1069                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1070
1071                         # Grab address and remark for the given key.
1072                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1073                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1074                 } else {
1075                         $buttontext = $Lang::tr{'add'};
1076                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1077                 }
1078
1079 print <<END;
1080                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1081                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1082                         <tr>
1083                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1084                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1085
1086                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1087                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1088                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1089                         </tr>
1090                         </form>
1091                 </table>
1092         </div>
1093 END
1094
1095 &Header::closebox();
1096
1097 # Only show the section for configuring the ruleset if one is present.
1098 if (%idsrules) {
1099         # Load neccessary perl modules for file stat and to format the timestamp.
1100         use File::stat;
1101         use POSIX qw( strftime );
1102
1103         # Call stat on the rulestarball.
1104         my $stat = stat("$IDS::rulestarball");
1105
1106         if (defined $stat) {
1107                 # Get timestamp the file creation.
1108                 my $mtime = $stat->mtime;
1109
1110                 # Convert into human read-able format.
1111                 my $rulesdate = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime));
1112
1113                 &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'} ($rulesdate)" );
1114
1115                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1116
1117                 # Output display table for rule files
1118                 print "<table width='100%'>\n";
1119
1120                 # Loop over each rule file
1121                 foreach my $rulefile (sort keys(%idsrules)) {
1122                         my $rulechecked = '';
1123
1124                         # Check if rule file is enabled
1125                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1126                                 $rulechecked = 'CHECKED';
1127                         }
1128
1129                         # Convert rulefile name into category name.
1130                         my $categoryname = &_rulefile_to_category($rulefile);
1131
1132                         # Table and rows for the rule files.
1133                         print"<tr>\n";
1134                         print"<td class='base' width='5%'>\n";
1135                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1136                         print"</td>\n";
1137                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1138                         print"<td class='base' width='5%' align='right'>\n";
1139                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1140                         print"</td>\n";
1141                         print"</tr>\n";
1142
1143                         # Rows which will be hidden per default and will contain the single rules.
1144                         print"<tr  style='display:none' id='$categoryname'>\n";
1145                         print"<td colspan='3'>\n";
1146
1147                         # Local vars
1148                         my $lines;
1149                         my $rows;
1150                         my $col;
1151
1152                         # New table for the single rules.
1153                         print "<table width='100%'>\n";
1154
1155                         # Loop over rule file rules
1156                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1157                                 # Local vars
1158                                 my $ruledefchecked = '';
1159
1160                                 # Skip rulefile itself.
1161                                 next if ($sid eq "Rulefile");
1162
1163                                 # If 2 rules have been displayed, start a new row
1164                                 if (($lines % 2) == 0) {
1165                                         print "</tr><tr>\n";
1166
1167                                         # Increase rows by once.
1168                                         $rows++;
1169                                 }
1170
1171                                 # Colour lines.
1172                                 if ($rows % 2) {
1173                                         $col="bgcolor='$color{'color20'}'";
1174                                 } else {
1175                                         $col="bgcolor='$color{'color22'}'";
1176                                 }
1177
1178                                 # Set rule state
1179                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1180                                         $ruledefchecked = 'CHECKED';
1181                                 }
1182
1183                                 # Create rule checkbox and display rule description
1184                                 print "<td class='base' width='5%' align='right' $col>\n";
1185                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1186                                 print "</td>\n";
1187                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1188
1189                                 # Increment rule count
1190                                 $lines++;
1191                         }
1192
1193                         # If do not have a second rule for row, create empty cell
1194                         if (($lines % 2) != 0) {
1195                                 print "<td class='base'></td>";
1196                         }
1197
1198                         # Close display table
1199                         print "</tr></table></td></tr>";
1200                 }
1201
1202                 # Close display table
1203                 print "</table>";
1204
1205                 print <<END
1206 <table width='100%'>
1207 <tr>
1208         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'></td>
1209 </tr>
1210 </table>
1211 </form>
1212 END
1213 ;
1214                 &Header::closebox();
1215         }
1216 }
1217
1218 &Header::closebigbox();
1219 &Header::closepage();
1220
1221 #
1222 ## A function to display a notice, to lock the webpage and
1223 ## tell the user which action currently will be performed.
1224 #
1225 sub working_notice ($) {
1226         my ($message) = @_;
1227
1228         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1229         &Header::openbigbox('100%', 'left', '', $errormessage);
1230         &Header::openbox( 'Waiting', 1,);
1231                 print <<END;
1232                         <table>
1233                                 <tr>
1234                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1235                                         <td>$message</td>
1236                                 </tr>
1237                         </table>
1238 END
1239         &Header::closebox();
1240         &Header::closebigbox();
1241         &Header::closepage();
1242 }
1243
1244 #
1245 ## A tiny function to perform a reload of the webpage after one second.
1246 #
1247 sub reload () {
1248         print "<meta http-equiv='refresh' content='1'>\n";
1249
1250         # Stop the script.
1251         exit;
1252 }
1253
1254 #
1255 ## Private function to read-in and parse rules of a given rulefile.
1256 #
1257 ## The given file will be read, parsed and all valid rules will be stored by ID,
1258 ## message/description and it's state in the idsrules hash.
1259 #
1260 sub readrulesfile ($) {
1261         my $rulefile = shift;
1262
1263         # Open rule file and read in contents
1264         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1265
1266         # Store file content in an array.
1267         my @lines = <RULEFILE>;
1268
1269         # Close file.
1270         close(RULEFILE);
1271
1272         # Loop over rule file contents
1273         foreach my $line (@lines) {
1274                 # Remove whitespaces.
1275                 chomp $line;
1276
1277                 # Skip blank  lines.
1278                 next if ($line =~ /^\s*$/);
1279
1280                 # Local vars.
1281                 my $sid;
1282                 my $msg;
1283
1284                 # Gather rule sid and message from the ruleline.
1285                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1286                         $msg = $1;
1287                         $sid = $2;
1288
1289                         # Check if a rule has been found.
1290                         if ($sid && $msg) {
1291                                 # Add rule to the idsrules hash.
1292                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1293
1294                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1295                                 if ($line =~ /^\#/) {
1296                                         # If yes, the rule is disabled.
1297                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1298                                 } else {
1299                                         # Otherwise the rule is enabled.
1300                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1301                                 }
1302                         }
1303                 }
1304         }
1305 }
1306
1307 #
1308 ## Function to get the used memory of a given process-id.
1309 #
1310 sub get_memory_usage($) {
1311         my ($pid) = @_;
1312
1313         my $memory = 0;
1314
1315         # Try to open the status file for the given process-id on the pseudo
1316         # file system proc.
1317         if (open(FILE, "/proc/$pid/status")) {
1318                 # Loop through the entire file.
1319                 while (<FILE>) {
1320                         # Splitt current line content and store them into variables.
1321                         my ($key, $value) = split(":", $_, 2);
1322
1323                         # Check if the current key is the one which contains the memory usage.
1324                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1325                         # of the entire process.
1326                         if ($key eq "VmRSS") {
1327                                 # Found the memory usage add it to the memory variable.
1328                                 $memory += $value;
1329
1330                                 # Break the loop.
1331                                 last;
1332                         }
1333                 }
1334
1335                 # Close file handle.
1336                 close(FILE);
1337
1338                 # Return memory usage.
1339                 return $memory;
1340         }
1341
1342         # If the file could not be open, return nothing.
1343         return;
1344 }
1345
1346 #
1347 ## Function to read-in the given enabled or disables sids file.
1348 #
1349 sub read_enabled_disabled_sids_file($) {
1350         my ($file) = @_;
1351
1352         # Temporary hash to store the sids and their state. It will be
1353         # returned at the end of this function.
1354         my %temphash;
1355
1356         # Open the given filename.
1357         open(FILE, "$file") or die "Could not open $file. $!\n";
1358
1359         # Loop through the file.
1360         while(<FILE>) {
1361                 # Remove newlines.
1362                 chomp $_;
1363
1364                 # Skip blank lines.
1365                 next if ($_ =~ /^\s*$/);
1366
1367                 # Skip coments.
1368                 next if ($_ =~ /^\#/);
1369
1370                 # Splitt line into sid and state part.
1371                 my ($state, $sid) = split(" ", $_);
1372
1373                 # Skip line if the sid is not numeric.
1374                 next unless ($sid =~ /\d+/ );
1375
1376                 # Check if the sid was enabled.
1377                 if ($state eq "enablesid") {
1378                         # Add the sid and its state as enabled to the temporary hash.
1379                         $temphash{$sid} = "enabled";
1380                 # Check if the sid was disabled.
1381                 } elsif ($state eq "disablesid") {
1382                         # Add the sid and its state as disabled to the temporary hash.
1383                         $temphash{$sid} = "disabled";
1384                 # Invalid state - skip the current sid and state.
1385                 } else {
1386                         next;
1387                 }
1388         }
1389
1390         # Close filehandle.
1391         close(FILE);
1392
1393         # Return the hash.
1394         return %temphash;
1395 }
1396
1397 #
1398 ## Private function to convert a given rulefile to a category name.
1399 ## ( No file extension anymore and if the name contained a dot, it
1400 ## would be replaced by a underline sign.)
1401 #
1402 sub _rulefile_to_category($) {
1403         my ($filename) = @_;
1404
1405         # Splitt the filename into single chunks and store them in a
1406         # temorary array.
1407         my @parts = split(/\./, $filename);
1408
1409         # Return / Remove last element of the temporary array.
1410         # This removes the file extension.
1411         pop @parts;
1412
1413         # Join together the single elements of the temporary array.
1414         # If these are more than one, use a "underline" for joining.
1415         my $category = join '_', @parts;
1416
1417         # Return the converted filename.
1418         return $category;
1419 }