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