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 # Check if openvpn is started and add it to the array of network zones.
  56 if ( -e "/var/run/openvpn.pid") {
  57         push(@network_zones, "ovpn");
  58 }
  59
  60 my $errormessage;
  61
  62 # Create files if they does not exist yet.
  63 &IDS::check_and_create_filelayout();
  64
  65 # Hash which contains the colour code of a network zone.
  66 my %colourhash = (
  67         'red' => $Header::colourred,
  68         'green' => $Header::colourgreen,
  69         'blue' => $Header::colourblue,
  70         'orange' => $Header::colourorange,
  71         'ovpn' => $Header::colourovpn
  72 );
  73
  74 &Header::showhttpheaders();
  75
  76 #Get GUI values
  77 &Header::getcgihash(\%cgiparams);
  78
  79 ## Add/edit an entry to the ignore file.
  80 #
  81 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  82
  83         # Check if any input has been performed.
  84         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  85
  86                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  87                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  88                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  89                 }
  90         } else {
  91                 $errormessage = "$Lang::tr{'guardian empty input'}";
  92         }
  93
  94         # Go further if there was no error.
  95         if ($errormessage eq '') {
  96                 my %ignored = ();
  97                 my $id;
  98                 my $status;
  99
 100                 # Assign hash values.
 101                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 102                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 103
 104                 # Read-in ignoredfile.
 105                 &General::readhasharray($IDS::ignored_file, \%ignored);
 106
 107                 # Check if we should edit an existing entry and got an ID.
 108                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 109                         # Assin the provided id.
 110                         $id = $cgiparams{'ID'};
 111
 112                         # Undef the given ID.
 113                         undef($cgiparams{'ID'});
 114
 115                         # Grab the configured status of the corresponding entry.
 116                         $status = $ignored{$id}[2];
 117                 } else {
 118                         # Each newly added entry automatically should be enabled.
 119                         $status = "enabled";
 120
 121                         # Generate the ID for the new entry.
 122                         #
 123                         # Sort the keys by their ID and store them in an array.
 124                         my @keys = sort { $a <=> $b } keys %ignored;
 125
 126                         # Reverse the key array.
 127                         my @reversed = reverse(@keys);
 128
 129                         # Obtain the last used id.
 130                         my $last_id = @reversed[0];
 131
 132                         # Increase the last id by one and use it as id for the new entry.
 133                         $id = ++$last_id;
 134                 }
 135
 136                 # Add/Modify the entry to/in the ignored hash.
 137                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 138
 139                 # Write the changed ignored hash to the ignored file.
 140                 &General::writehasharray($IDS::ignored_file, \%ignored);
 141
 142                 # Regenerate the ignore file.
 143                 &IDS::generate_ignore_file();
 144         }
 145
 146         # Check if the IDS is running.
 147         if(&IDS::ids_is_running()) {
 148                 # Call suricatactrl to perform a reload.
 149                 &IDS::call_suricatactrl("reload");
 150         }
 151
 152 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 153 #
 154
 155 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 156         my %ignored = ();
 157
 158         # Only go further, if an ID has been passed.
 159         if ($cgiparams{'ID'}) {
 160                 # Assign the given ID.
 161                 my $id = $cgiparams{'ID'};
 162
 163                 # Undef the given ID.
 164                 undef($cgiparams{'ID'});
 165
 166                 # Read-in ignoredfile.
 167                 &General::readhasharray($IDS::ignored_file, \%ignored);
 168
 169                 # Grab the configured status of the corresponding entry.
 170                 my $status = $ignored{$id}[2];
 171
 172                 # Switch the status.
 173                 if ($status eq "disabled") {
 174                         $status = "enabled";
 175                 } else {
 176                         $status = "disabled";
 177                 }
 178
 179                 # Modify the status of the existing entry.
 180                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 181
 182                 # Write the changed ignored hash to the ignored file.
 183                 &General::writehasharray($IDS::ignored_file, \%ignored);
 184
 185                 # Regenerate the ignore file.
 186                 &IDS::generate_ignore_file();
 187
 188                 # Check if the IDS is running.
 189                 if(&IDS::ids_is_running()) {
 190                         # Call suricatactrl to perform a reload.
 191                         &IDS::call_suricatactrl("reload");
 192                 }
 193         }
 194
 195 ## Remove entry from ignore list.
 196 #
 197 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 198         my %ignored = ();
 199
 200         # Read-in ignoredfile.
 201         &General::readhasharray($IDS::ignored_file, \%ignored);
 202
 203         # Drop entry from the hash.
 204         delete($ignored{$cgiparams{'ID'}});
 205
 206         # Undef the given ID.
 207         undef($cgiparams{'ID'});
 208
 209         # Write the changed ignored hash to the ignored file.
 210         &General::writehasharray($IDS::ignored_file, \%ignored);
 211
 212         # Regenerate the ignore file.
 213         &IDS::generate_ignore_file();
 214
 215         # Check if the IDS is running.
 216         if(&IDS::ids_is_running()) {
 217                 # Call suricatactrl to perform a reload.
 218                 &IDS::call_suricatactrl("reload");
 219         }
 220 }
 221
 222 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 223 if (-e $IDS::ids_page_lock_file) {
 224         # Lock the webpage and print notice about autoupgrade of the ruleset
 225         # is in progess.
 226         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 227
 228         # Loop and check if the file still exists.
 229         while(-e $IDS::ids_page_lock_file) {
 230                 # Sleep for a second and re-check.
 231                 sleep 1;
 232         }
 233
 234         # Page has been unlocked, perform a reload.
 235         &reload();
 236 }
 237
 238 # Check if any error has been stored.
 239 if (-e $IDS::storederrorfile) {
 240         # Open file to read in the stored error message.
 241         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 242
 243         # Read the stored error message.
 244         $errormessage = <FILE>;
 245
 246         # Close file.
 247         close (FILE);
 248
 249         # Delete the file, which is now not longer required.
 250         unlink($IDS::storederrorfile);
 251 }
 252
 253 # Gather ruleset details.
 254 if ($cgiparams{'RULESET'}) {
 255         ## Grab all available rules and store them in the idsrules hash.
 256         #
 257         # Open rules directory and do a directory listing.
 258         opendir(DIR, $IDS::rulespath) or die $!;
 259                 # Loop through the direcory.
 260                 while (my $file = readdir(DIR)) {
 261
 262                         # We only want files.
 263                         next unless (-f "$IDS::rulespath/$file");
 264
 265                         # Ignore empty files.
 266                         next if (-z "$IDS::rulespath/$file");
 267
 268                         # Use a regular expression to find files ending in .rules
 269                         next unless ($file =~ m/\.rules$/);
 270
 271                         # Ignore files which are not read-able.
 272                         next unless (-R "$IDS::rulespath/$file");
 273
 274                         # Skip whitelist rules file.
 275                         next if( $file eq "whitelist.rules");
 276
 277                         # Call subfunction to read-in rulefile and add rules to
 278                         # the idsrules hash.
 279                         &readrulesfile("$file");
 280                 }
 281
 282         closedir(DIR);
 283
 284         # Gather used rulefiles.
 285         #
 286         # Check if the file for activated rulefiles is not empty.
 287         if(-f $IDS::used_rulefiles_file) {
 288                 # Open the file for used rulefile and read-in content.
 289                 open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 290
 291                 # Read-in content.
 292                 my @lines = <FILE>;
 293
 294                 # Close file.
 295                 close(FILE);
 296
 297                 # Loop through the array.
 298                 foreach my $line (@lines) {
 299                         # Remove newlines.
 300                         chomp($line);
 301
 302                         # Skip comments.
 303                         next if ($line =~ /\#/);
 304
 305                         # Skip blank  lines.
 306                         next if ($line =~ /^\s*$/);
 307
 308                         # Gather rule sid and message from the ruleline.
 309                         if ($line =~ /.*- (.*)/) {
 310                                 my $rulefile = $1;
 311
 312                                 # Check if the current rulefile exists in the %idsrules hash.
 313                                 # If not, the file probably does not exist anymore or contains
 314                                 # no rules.
 315                                 if($idsrules{$rulefile}) {
 316                                         # Add the rulefile state to the %idsrules hash.
 317                                         $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 318                                 }
 319                         }
 320                 }
 321         }
 322 }
 323
 324 # Save ruleset configuration.
 325 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 326         my %oldsettings;
 327
 328         # Read-in current (old) IDS settings.
 329         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 330
 331         # Prevent form name from been stored in conf file.
 332         delete $cgiparams{'RULESET'};
 333
 334         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 335         if ($IDS::Ruleset::Providers{$cgiparams{'RULES'}}{'requires_subscription'} eq "True") {
 336                 # Check if an subscription/oinkcode has been provided.
 337                 if ($cgiparams{'OINKCODE'}) {
 338                         # Check if the oinkcode contains unallowed chars.
 339                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 340                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 341                         }
 342                 } else {
 343                         # Print an error message, that an subsription/oinkcode is required for this
 344                         # vendor.
 345                         $errormessage = $Lang::tr{'ids oinkcode required'};
 346                 }
 347         }
 348
 349         # Go on if there are no error messages.
 350         if (!$errormessage) {
 351                 # Store settings into settings file.
 352                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 353
 354                 # Check if a ruleset is present - if not or the source has been changed download it.
 355                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 356                         # Check if the red device is active.
 357                         unless (-e "${General::swroot}/red/active") {
 358                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 359                         }
 360
 361                         # Check if enough free disk space is availabe.
 362                         if(&IDS::checkdiskspace()) {
 363                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 364                         }
 365
 366                         # Check if any errors happend.
 367                         unless ($errormessage) {
 368                                 # Lock the webpage and print notice about downloading
 369                                 # a new ruleset.
 370                                 &working_notice("$Lang::tr{'ids working'}");
 371
 372                                 # Write the modify sid's file and pass the taken ruleaction.
 373                                 &IDS::write_modify_sids_file();
 374
 375                                 # Call subfunction to download the ruleset.
 376                                 if(&IDS::downloadruleset()) {
 377                                         $errormessage = $Lang::tr{'could not download latest updates'};
 378
 379                                         # Call function to store the errormessage.
 380                                         &IDS::_store_error_message($errormessage);
 381                                 } else {
 382                                         # Call subfunction to launch oinkmaster.
 383                                         &IDS::oinkmaster();
 384                                 }
 385
 386                                 # Check if the IDS is running.
 387                                 if(&IDS::ids_is_running()) {
 388                                         # Call suricatactrl to stop the IDS - because of the changed
 389                                         # ruleset - the use has to configure it before suricata can be
 390                                         # used again.
 391                                         &IDS::call_suricatactrl("stop");
 392                                 }
 393
 394                                 # Perform a reload of the page.
 395                                 &reload();
 396                         }
 397                 }
 398         }
 399
 400 # Save ruleset.
 401 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 402         # Arrays to store which rulefiles have been enabled and will be used.
 403         my @enabled_rulefiles;
 404
 405         # Hash to store the user-enabled and disabled sids.
 406         my %enabled_disabled_sids;
 407
 408         # Store if a restart of suricata is required.
 409         my $suricata_restart_required;
 410
 411         # Loop through the hash of idsrules.
 412         foreach my $rulefile(keys %idsrules) {
 413                 # Check if the state of the rulefile has been changed.
 414                 unless ($cgiparams{$rulefile} eq $idsrules{$rulefile}{'Rulefile'}{'State'}) {
 415                         # A restart of suricata is required to apply the changes of the used rulefiles.
 416                         $suricata_restart_required = 1;
 417                 }
 418
 419                 # Check if the rulefile is enabled.
 420                 if ($cgiparams{$rulefile} eq "on") {
 421                         # Add rulefile to the array of enabled rulefiles.
 422                         push(@enabled_rulefiles, $rulefile);
 423
 424                         # Drop item from cgiparams hash.
 425                         delete $cgiparams{$rulefile};
 426                 }
 427         }
 428
 429         # Read-in the files for enabled/disabled sids.
 430         # This will be done by calling the read_enabled_disabled_sids_file function two times
 431         # and merge the returned hashes together into the enabled_disabled_sids hash.
 432         %enabled_disabled_sids = (
 433                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 434                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 435
 436         # Loop through the hash of idsrules.
 437         foreach my $rulefile (keys %idsrules) {
 438                 # Loop through the single rules of the rulefile.
 439                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 440                         # Skip the current sid if it is not numeric.
 441                         next unless ($sid =~ /\d+/ );
 442
 443                         # Check if there exists a key in the cgiparams hash for this sid.
 444                         if (exists($cgiparams{$sid})) {
 445                                 # Look if the rule is disabled.
 446                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 447                                         # Check if the state has been set to 'on'.
 448                                         if ($cgiparams{$sid} eq "on") {
 449                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 450                                                 $enabled_disabled_sids{$sid} = "enabled";
 451
 452                                                 # Drop item from cgiparams hash.
 453                                                 delete $cgiparams{$rulefile}{$sid};
 454                                         }
 455                                 }
 456                         } else {
 457                                 # Look if the rule is enabled.
 458                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 459                                         # Check if the state is 'on' and should be disabled.
 460                                         # In this case there is no entry
 461                                         # for the sid in the cgiparams hash.
 462                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 463                                         $enabled_disabled_sids{$sid} = "disabled";
 464
 465                                         # Drop item from cgiparams hash.
 466                                         delete $cgiparams{$rulefile}{$sid};
 467                                 }
 468                         }
 469                 }
 470         }
 471
 472         # Open enabled sid's file for writing.
 473         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 474
 475         # Open disabled sid's file for writing.
 476         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 477
 478         # Write header to the files.
 479         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 480         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 481
 482         # Check if the hash for enabled/disabled files contains any entries.
 483         if (%enabled_disabled_sids) {
 484                 # Loop through the hash.
 485                 foreach my $sid (keys %enabled_disabled_sids) {
 486                         # Check if the sid is enabled.
 487                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 488                                 # Print the sid to the enabled_sids file.
 489                                 print ENABLED_FILE "enablesid $sid\n";
 490                         # Check if the sid is disabled.
 491                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 492                                 # Print the sid to the disabled_sids file.
 493                                 print DISABLED_FILE "disablesid $sid\n";
 494                         # Something strange happende - skip the current sid.
 495                         } else {
 496                                 next;
 497                         }
 498                 }
 499         }
 500
 501         # Close file for enabled_sids after writing.
 502         close(ENABLED_FILE);
 503
 504         # Close file for disabled_sids after writing.
 505         close(DISABLED_FILE);
 506
 507         # Call function to generate and write the used rulefiles file.
 508         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 509
 510         # Lock the webpage and print message.
 511         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 512
 513         # Call oinkmaster to alter the ruleset.
 514         &IDS::oinkmaster();
 515
 516         # Check if the IDS is running.
 517         if(&IDS::ids_is_running()) {
 518                 # Check if a restart of suricata is required.
 519                 if ($suricata_restart_required) {
 520                         # Call suricatactrl to perform the restart.
 521                         &IDS::call_suricatactrl("restart");
 522                 } else {
 523                         # Call suricatactrl to perform a reload.
 524                         &IDS::call_suricatactrl("reload");
 525                 }
 526         }
 527
 528         # Reload page.
 529         &reload();
 530
 531 # Download new ruleset.
 532 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 533         # Check if the red device is active.
 534         unless (-e "${General::swroot}/red/active") {
 535                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 536         }
 537
 538         # Check if enought free disk space is availabe.
 539         if(&IDS::checkdiskspace()) {
 540                 $errormessage = "$Lang::tr{'not enough disk space'}";
 541         }
 542
 543         # Check if any errors happend.
 544         unless ($errormessage) {
 545                 # Lock the webpage and print notice about downloading
 546                 # a new ruleset.
 547                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 548
 549                 # Call subfunction to download the ruleset.
 550                 if(&IDS::downloadruleset()) {
 551                         $errormessage = $Lang::tr{'could not download latest updates'};
 552
 553                         # Call function to store the errormessage.
 554                         &IDS::_store_error_message($errormessage);
 555
 556                         # Preform a reload of the page.
 557                         &reload();
 558                 } else {
 559                         # Call subfunction to launch oinkmaster.
 560                         &IDS::oinkmaster();
 561
 562                         # Check if the IDS is running.
 563                         if(&IDS::ids_is_running()) {
 564                                 # Call suricatactrl to perform a reload.
 565                                 &IDS::call_suricatactrl("reload");
 566                         }
 567
 568                         # Perform a reload of the page.
 569                         &reload();
 570                 }
 571         }
 572 # Save IDS settings.
 573 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 574         my %oldidssettings;
 575         my $reload_page;
 576         my $monitored_zones = 0;
 577
 578         # Read-in current (old) IDS settings.
 579         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 580
 581         # Prevent form name from been stored in conf file.
 582         delete $cgiparams{'IDS'};
 583
 584         # Check if the IDS should be enabled.
 585         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 586                 # Check if any ruleset is available. Otherwise abort and display an error.
 587                 unless(%used_providers) {
 588                         $errormessage = $Lang::tr{'ids no ruleset available'};
 589                 }
 590
 591                 # Loop through the array of available interfaces.
 592                 foreach my $zone (@network_zones) {
 593                         # Convert interface name into upper case.
 594                         my $zone_upper = uc($zone);
 595
 596                         # Check if the IDS is enabled for this interaces.
 597                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 598                                 # Increase count.
 599                                 $monitored_zones++;
 600                         }
 601                 }
 602
 603                 # Check if at least one zone should be monitored, or show an error.
 604                 unless ($monitored_zones >= 1) {
 605                         $errormessage = $Lang::tr{'ids no network zone'};
 606                 }
 607         }
 608
 609         # Go on if there are no error messages.
 610         if (!$errormessage) {
 611                 # Store settings into settings file.
 612                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 613         }
 614
 615         # Check if the the automatic rule update hass been touched.
 616         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldidssettings{'AUTOUPDATE_INTERVAL'}) {
 617                 # Call suricatactrl to set the new interval.
 618                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 619         }
 620
 621         # Generate file to store the home net.
 622         &IDS::generate_home_net_file();
 623
 624         # Generate file to the store the DNS servers.
 625         &IDS::generate_dns_servers_file();
 626
 627         # Generate file to store the HTTP ports.
 628         &IDS::generate_http_ports_file();
 629
 630         # Write the modify sid's file and pass the taken ruleaction.
 631         &IDS::write_modify_sids_file();
 632
 633         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 634         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 635                 # Check if a ruleset exists.
 636                 if (%used_providers) {
 637                         # Lock the webpage and print message.
 638                         &working_notice("$Lang::tr{'ids working'}");
 639
 640                         # Call oinkmaster to alter the ruleset.
 641                         &IDS::oinkmaster();
 642
 643                         # Set reload_page to "True".
 644                         $reload_page="True";
 645                 }
 646         }
 647
 648         # Check if the IDS currently is running.
 649         if(&IDS::ids_is_running()) {
 650                 # Check if ENABLE_IDS is set to on.
 651                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 652                         # Call suricatactrl to perform a reload of suricata.
 653                         &IDS::call_suricatactrl("reload");
 654                 } else {
 655                         # Call suricatactrl to stop suricata.
 656                         &IDS::call_suricatactrl("stop");
 657                 }
 658         } else {
 659                 # Call suricatactrl to start suricata.
 660                 &IDS::call_suricatactrl("start");
 661         }
 662
 663         # Check if the page should be reloaded.
 664         if ($reload_page) {
 665                 # Perform a reload of the page.
 666                 &reload();
 667         }
 668
 669 # Toggle Enable/Disable autoupdate for a provider
 670 } elsif ($cgiparams{'AUTOUPDATE'} eq $Lang::tr{'toggle enable disable'}) {
 671         my %used_providers = ();
 672
 673         # Only go further, if an ID has been passed.
 674         if ($cgiparams{'ID'}) {
 675                 # Assign the given ID.
 676                 my $id = $cgiparams{'ID'};
 677
 678                 # Undef the given ID.
 679                 undef($cgiparams{'ID'});
 680
 681                 # Read-in providers settings file.
 682                 &General::readhasharray($IDS::providers_settings_file, \%used_providers);
 683
 684                 # Grab the configured status of the corresponding entry.
 685                 my $status_autoupdate = $used_providers{$id}[2];
 686
 687                 # Switch the status.
 688                 if ($status_autoupdate eq "disabled") {
 689                         $status_autoupdate = "enabled";
 690                 } else {
 691                         $status_autoupdate = "disabled";
 692                 }
 693
 694                 # Modify the status of the existing entry.
 695                 $used_providers{$id} = ["$used_providers{$id}[0]", "$used_providers{$id}[1]", "$status_autoupdate", "$used_providers{$id}[3]"];
 696
 697                 # Write the changed hash to the providers settings file.
 698                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 699         }
 700
 701 # Add/Edit a provider to the list of used providers.
 702 #
 703 } elsif (($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") || ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'update'}")) {
 704         my %used_providers = ();
 705
 706         # Read-in providers settings file.
 707         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 708
 709         # Assign some nice human-readable values.
 710         my $provider = $cgiparams{'PROVIDER'};
 711         my $subscription_code = $cgiparams{'SUBSCRIPTION_CODE'};
 712         my $status_autoupdate;
 713
 714         # Handle autoupdate checkbox.
 715         if ($cgiparams{'ENABLE_AUTOUPDATE'} eq "on") {
 716                 $status_autoupdate = "enabled";
 717         } else {
 718                 $status_autoupdate = "disabled";
 719         }
 720
 721         # Check if we are going to add a new provider.
 722         if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'add'}") {
 723                 # Loop through the hash of used providers.
 724                 foreach my $id ( keys %used_providers) {
 725                         # Check if the choosen provider is already in use.
 726                         if ($used_providers{$id}[0] eq "$provider") {
 727                                 # XXX - add to language file.
 728                                 # Assign error message.
 729                                 $errormessage = "The choosen provider is already in use.";
 730                         }
 731                 }
 732         }
 733
 734         # Check if the provider requires a subscription code.
 735         if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
 736                 # Check if an subscription code has been provided.
 737                 if ($subscription_code) {
 738                         # Check if the code contains unallowed chars.
 739                         unless ($subscription_code =~ /^[a-z0-9]+$/) {
 740                                 $errormessage = $Lang::tr{'invalid input for subscription code'};
 741                         }
 742                 } else {
 743                         # Print an error message, that an subsription code is required for this
 744                         # provider.
 745                         $errormessage = $Lang::tr{'ids subscription code required'};
 746                 }
 747         }
 748
 749         # Go further if there was no error.
 750         if ($errormessage eq '') {
 751                 my $id;
 752                 my $status;
 753
 754                 # Check if we should edit an existing entry and got an ID.
 755                 if (($cgiparams{'PROVIDERS'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 756                         # Assin the provided id.
 757                         $id = $cgiparams{'ID'};
 758
 759                         # Undef the given ID.
 760                         undef($cgiparams{'ID'});
 761
 762                         # Grab the configured status of the corresponding entry.
 763                         $status = $used_providers{$id}[3];
 764                 } else {
 765                         # Each newly added entry automatically should be enabled.
 766                         $status = "enabled";
 767
 768                         # Generate the ID for the new entry.
 769                         #
 770                         # Sort the keys by their ID and store them in an array.
 771                         my @keys = sort { $a <=> $b } keys %used_providers;
 772
 773                         # Reverse the key array.
 774                         my @reversed = reverse(@keys);
 775
 776                         # Obtain the last used id.
 777                         my $last_id = @reversed[0];
 778
 779                         # Increase the last id by one and use it as id for the new entry.
 780                         $id = ++$last_id;
 781                 }
 782
 783                 # Add/Modify the entry to/in the used providers hash..
 784                 $used_providers{$id} = ["$provider", "$subscription_code", "$status_autoupdate", "$status"];
 785
 786                 # Write the changed hash to the providers settings file.
 787                 &General::writehasharray($IDS::providers_settings_file, \%used_providers);
 788
 789                 # Undefine providers flag.
 790                 undef($cgiparams{'PROVIDERS'});
 791         }
 792 }
 793
 794 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 795
 796 &Header::openbigbox('100%', 'left', '', $errormessage);
 797
 798 &show_display_error_message();
 799
 800 if ($cgiparams{'RULESET'} eq "$Lang::tr{'ids customize ruleset'}" ) {
 801         &show_customize_ruleset();
 802 } elsif ($cgiparams{'PROVIDERS'} ne "") {
 803         &show_add_provider();
 804 } else {
 805         &show_mainpage();
 806 }
 807
 808 &Header::closebigbox();
 809 &Header::closepage();
 810
 811 #
 812 ## Tiny function to show if a error message happened.
 813 #
 814 sub show_display_error_message() {
 815         if ($errormessage) {
 816                 &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 817                         print "<class name='base'>$errormessage\n";
 818                         print "&nbsp;</class>\n";
 819                 &Header::closebox();
 820         }
 821 }
 822
 823 #
 824 ## Function to display the main IDS page.
 825 #
 826 sub show_mainpage() {
 827         # Read-in idssettings and provider settings.
 828         &General::readhash("$IDS::ids_settings_file", \%idssettings);
 829         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
 830
 831         # If no autoupdate intervall has been configured yet, set default value.
 832         unless(exists($idssettings{'AUTOUPDATE_INTERVAL'})) {
 833                 # Set default to "weekly".
 834                 $idssettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 835         }
 836
 837         # Read-in ignored hosts.
 838         &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 839
 840         $checked{'ENABLE_IDS'}{'off'} = '';
 841         $checked{'ENABLE_IDS'}{'on'} = '';
 842         $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 843         $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 844         $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 845         $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 846         $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 847         $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 848         $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 849         $selected{'AUTOUPDATE_INTERVAL'}{$idssettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 850
 851         # Draw current state of the IDS
 852         &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 853
 854         # Check if the IDS is running and obtain the process-id.
 855         my $pid = &IDS::ids_is_running();
 856
 857         # Display some useful information, if suricata daemon is running.
 858         if ($pid) {
 859                 # Gather used memory.
 860                 my $memory = &get_memory_usage($pid);
 861
 862                 print <<END;
 863                         <table width='95%' cellspacing='0' class='tbl'>
 864                                 <tr>
 865                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 866                                 </tr>
 867
 868                                 <tr>
 869                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
 870                                         <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 871                                 </tr>
 872
 873                                 <tr>
 874                                         <td class='base'></td>
 875                                         <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 876                                         <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 877                                 </tr>
 878
 879                                 <tr>
 880                                         <td class='base'></td>
 881                                         <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 882                                         <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 883                                 </tr>
 884                         </table>
 885 END
 886         } else {
 887                 # Otherwise display a hint that the service is not launched.
 888                 print <<END;
 889                         <table width='95%' cellspacing='0' class='tbl'>
 890                                 <tr>
 891                                         <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 892                                 </tr>
 893
 894                                 <tr>
 895                                         <td class='base'>$Lang::tr{'guardian daemon'}</td>
 896                                         <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 897                                 </tr>
 898                         </table>
 899 END
 900         }
 901
 902         # Only show this area, if at least one ruleset provider is configured.
 903         if (%used_providers) {
 904
 905 print <<END
 906
 907                 <br><br><h2>$Lang::tr{'settings'}</h2>
 908
 909                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 910                         <table width='100%' border='0'>
 911                                 <tr>
 912                                         <td class='base' colspan='2'>
 913                                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 914                                         </td>
 915
 916                                         <td class='base' colspan='2'>
 917                                                 <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 918                                 </td>
 919                                 </tr>
 920
 921                                 <tr>
 922                                         <td><br><br></td>
 923                                         <td><br><br></td>
 924                                         <td><br><br></td>
 925                                         <td><br><br></td>
 926                                 </tr>
 927
 928                                 <tr>
 929                                         <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 930                                 </tr>
 931
 932                                 <tr>
 933 END
 934 ;
 935
 936                 # Loop through the array of available networks and print config options.
 937                 foreach my $zone (@network_zones) {
 938                         my $checked_input;
 939                         my $checked_forward;
 940
 941                         # Convert current zone name to upper case.
 942                         my $zone_upper = uc($zone);
 943
 944                         # Set zone name.
 945                         my $zone_name = $zone;
 946
 947                         # Dirty hack to get the correct language string for the red zone.
 948                         if ($zone eq "red") {
 949                                 $zone_name = "red1";
 950                         }
 951
 952                         # Grab checkbox status from settings hash.
 953                         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 954                                 $checked_input = "checked = 'checked'";
 955                         }
 956
 957                         print "<td class='base' width='20%'>\n";
 958                         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 959                         print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 960                         print "</td>\n";
 961                 }
 962
 963 print <<END
 964                                 </tr>
 965
 966                                 <tr>
 967                                         <td><br><br></td>
 968                                         <td><br><br></td>
 969                                         <td><br><br></td>
 970                                         <td><br><br></td>
 971                                 </tr>
 972
 973                                 <tr>
 974                                         <td colspan='4'><b>$Lang::tr{'ids automatic rules update'}</b></td>
 975                                 </tr>
 976
 977                                 <tr>
 978                                         <td>
 979                                                 <select name='AUTOUPDATE_INTERVAL'>
 980                                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 981                                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 982                                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 983                                                 </select>
 984                                         </td>
 985                                 </tr>
 986                         </table>
 987
 988                         <br><br>
 989
 990                         <table width='100%'>
 991                                 <tr>
 992                                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 993                                 </tr>
 994                         </table>
 995                 </form>
 996 END
 997 ;
 998
 999         }
1000
1001         &Header::closebox();
1002
1003         #
1004         # Used Ruleset Providers section.
1005         #
1006         &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
1007
1008 print <<END;
1009         <table width='100%' border='0'>
1010                 <tr>
1011                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ids provider'}</b></td>
1012                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'date'}</b></td>
1013                         <td class='base' bgcolor='$color{'color20'}' align='center'><b>$Lang::tr{'ids autoupdates'}</b></td>
1014                         <td class='base' bgcolor='$color{'color20'}'></td>
1015                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1016                 </tr>
1017 END
1018                 # Check if some providers has been configured.
1019                 if (keys (%used_providers)) {
1020                         my $col = "";
1021
1022                         # Loop through all entries of the hash.
1023                         foreach my $id (sort keys(%used_providers)) {
1024                                 # Assign data array positions to some nice variable names.
1025                                 my $provider = $used_providers{$id}[0];
1026                                 my $provider_name = &get_provider_name($provider);
1027
1028                                 #XXX my $rulesdate = &IDS::get_ruleset_date($provider);
1029                                 my $rulesdate;
1030
1031                                 my $subscription_code = $used_providers{$id}[1];
1032                                 my $autoupdate_status = $used_providers{$id}[2];
1033                                 my $status  = $used_providers{$id}[3];
1034
1035                                 # Check if the item number is even or not.
1036                                 if ($id % 2) {
1037                                         $col="bgcolor='$color{'color22'}'";
1038                                 } else {
1039                                         $col="bgcolor='$color{'color20'}'";
1040                                 }
1041
1042                                 # Choose icons for the checkboxes.
1043                                 my $status_gif;
1044                                 my $status_gdesc;
1045                                 my $autoupdate_status_gif;
1046                                 my $autoupdate_status_gdesc;
1047
1048                                 # Check if the status is enabled and select the correct image and description.
1049                                 if ($status eq 'enabled' ) {
1050                                         $status_gif = 'on.gif';
1051                                         $status_gdesc = $Lang::tr{'click to disable'};
1052                                 } else {
1053                                         $status_gif = 'off.gif';
1054                                         $status_gdesc = $Lang::tr{'click to enable'};
1055                                 }
1056
1057                                 # Check if the autoupdate status is enabled and select the correct image and description.
1058                                 if ($autoupdate_status eq 'enabled') {
1059                                         $autoupdate_status_gif = 'on.gif';
1060                                         $autoupdate_status_gdesc = $Lang::tr{'click to disable'};
1061                                 } else {
1062                                         $autoupdate_status_gif = 'off.gif';
1063                                         $autoupdate_status_gdesc = $Lang::tr{'click to enable'};
1064                                 }
1065
1066 print <<END;
1067                                 <tr>
1068                                         <td width='33%' class='base' $col>$provider_name</td>
1069                                         <td width='30%' class='base' $col>$rulesdate</td>
1070
1071                                         <td align='center' $col>
1072                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1073                                                         <input type='hidden' name='AUTOUPDATE' value='$Lang::tr{'toggle enable disable'}' />
1074                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$autoupdate_status_gif' alt='$autoupdate_status_gdesc' title='$autoupdate_status_gdesc' />
1075                                                         <input type='hidden' name='ID' value='$id' />
1076                                                 </form>
1077                                         </td>
1078
1079                                         <td align='center' $col>
1080                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1081                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'toggle enable disable'}'>
1082                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$status_gif' alt='$status_gdesc' title='$status_gdesc'>
1083                                                         <input type='hidden' name='ID' value='$id'>
1084                                                 </form>
1085                                         </td>
1086
1087                                         <td align='center' $col>
1088                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1089                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'edit'}'>
1090                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1091                                                         <input type='hidden' name='ID' value='$id'>
1092                                                 </form>
1093                                         </td>
1094
1095                                         <td align='center' $col>
1096                                                 <form method='post' name='$provider' action='$ENV{'SCRIPT_NAME'}'>
1097                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1098                                                         <input type='hidden' name='ID' value='$id'>
1099                                                         <input type='hidden' name='PROVIDERS' value='$Lang::tr{'remove'}'>
1100                                                 </form>
1101                                         </td>
1102                                 </tr>
1103 END
1104                         }
1105
1106                 } else {
1107                         # Print notice that currently no hosts are ignored.
1108                         print "<tr>\n";
1109                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1110                         print "</tr>\n";
1111                 }
1112
1113         print "</table>\n";
1114
1115         # Section to add new elements or edit existing ones.
1116 print <<END;
1117         <br>
1118         <hr>
1119         <br>
1120
1121         <div align='right'>
1122                 <table width='100%'>
1123                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1124                                 <tr>
1125 END
1126
1127                                         # Only show this button if a ruleset provider is configured.
1128                                         if (%used_providers) {
1129                                                 print "<input type='submit' name='RULESET' value='$Lang::tr{'ids customize ruleset'}'>\n";
1130                                         }
1131 print <<END;
1132                                         <input type='submit' name='PROVIDERS' value='$Lang::tr{'ids add provider'}'>
1133                                 </tr>
1134                         </form>
1135                 </table>
1136         </div>
1137 END
1138
1139         &Header::closebox();
1140
1141         #
1142         # Whitelist / Ignorelist
1143         #
1144         &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
1145
1146         print <<END;
1147         <table width='100%'>
1148                 <tr>
1149                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
1150                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
1151                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
1152                 </tr>
1153 END
1154                 # Check if some hosts have been added to be ignored.
1155                 if (keys (%ignored)) {
1156                         my $col = "";
1157
1158                         # Loop through all entries of the hash.
1159                         while( (my $key) = each %ignored)  {
1160                                 # Assign data array positions to some nice variable names.
1161                                 my $address = $ignored{$key}[0];
1162                                 my $remark = $ignored{$key}[1];
1163                                 my $status  = $ignored{$key}[2];
1164
1165                                 # Check if the key (id) number is even or not.
1166                                 if ($cgiparams{'ID'} eq $key) {
1167                                         $col="bgcolor='${Header::colouryellow}'";
1168                                 } elsif ($key % 2) {
1169                                         $col="bgcolor='$color{'color22'}'";
1170                                 } else {
1171                                         $col="bgcolor='$color{'color20'}'";
1172                                 }
1173
1174                                 # Choose icon for the checkbox.
1175                                 my $gif;
1176                                 my $gdesc;
1177
1178                                 # Check if the status is enabled and select the correct image and description.
1179                                 if ($status eq 'enabled' ) {
1180                                         $gif = 'on.gif';
1181                                         $gdesc = $Lang::tr{'click to disable'};
1182                                 } else {
1183                                         $gif = 'off.gif';
1184                                         $gdesc = $Lang::tr{'click to enable'};
1185                                 }
1186
1187 print <<END;
1188                                 <tr>
1189                                         <td width='20%' class='base' $col>$address</td>
1190                                         <td width='65%' class='base' $col>$remark</td>
1191
1192                                         <td align='center' $col>
1193                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1194                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}'>
1195                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc'>
1196                                                         <input type='hidden' name='ID' value='$key'>
1197                                                 </form>
1198                                         </td>
1199
1200                                         <td align='center' $col>
1201                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1202                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}'>
1203                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}'>
1204                                                         <input type='hidden' name='ID' value='$key'>
1205                                                 </form>
1206                                         </td>
1207
1208                                         <td align='center' $col>
1209                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1210                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1211                                                         <input type='hidden' name='ID' value='$key'>
1212                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1213                                                 </form>
1214                                                 </td>
1215                                         </tr>
1216 END
1217                                 }
1218                         } else {
1219                                 # Print notice that currently no hosts are ignored.
1220                                 print "<tr>\n";
1221                                 print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1222                                 print "</tr>\n";
1223                         }
1224
1225                 print "</table>\n";
1226
1227                 # Section to add new elements or edit existing ones.
1228 print <<END;
1229                 <br>
1230                 <hr>
1231                 <br>
1232
1233                 <div align='center'>
1234                         <table width='100%'>
1235 END
1236
1237                 # Assign correct headline and button text.
1238                 my $buttontext;
1239                 my $entry_address;
1240                 my $entry_remark;
1241
1242                 # Check if an ID (key) has been given, in this case an existing entry should be edited.
1243                 if ($cgiparams{'ID'} ne '') {
1244                         $buttontext = $Lang::tr{'update'};
1245                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1246
1247                                 # Grab address and remark for the given key.
1248                                 $entry_address = $ignored{$cgiparams{'ID'}}[0];
1249                                 $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1250                         } else {
1251                                 $buttontext = $Lang::tr{'add'};
1252                                 print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1253                         }
1254
1255 print <<END;
1256                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1257                                 <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1258                                 <tr>
1259                                         <td width='30%'>$Lang::tr{'ip address'}: </td>
1260                                         <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1261
1262                                         <td width='30%'>$Lang::tr{'remark'}: </td>
1263                                         <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1264                                         <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1265                                 </tr>
1266                                 </form>
1267                         </table>
1268                 </div>
1269 END
1270
1271         &Header::closebox();
1272 }
1273
1274 #
1275 ## Function to show the customize ruleset section.
1276 #
1277 sub show_customize_ruleset() {
1278         ### Java Script ###
1279         print"<script>\n";
1280
1281         # Java script variable declaration for show and hide.
1282         print"var show = \"$Lang::tr{'ids show'}\"\;\n";
1283         print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
1284
1285 print <<END
1286         // Tiny java script function to show/hide the rules
1287         // of a given category.
1288         function showhide(tblname) {
1289                 \$("#" + tblname).toggle();
1290
1291                 // Get current content of the span element.
1292                 var content = document.getElementById("span_" + tblname);
1293
1294                 if (content.innerHTML === show) {
1295                         content.innerHTML = hide;
1296                 } else {
1297                         content.innerHTML = show;
1298                 }
1299         }
1300         </script>
1301 END
1302 ;
1303         &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'}" );
1304                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1305
1306                 # Output display table for rule files
1307                 print "<table width='100%'>\n";
1308
1309                 # Loop over each rule file
1310                 foreach my $rulefile (sort keys(%idsrules)) {
1311                         my $rulechecked = '';
1312
1313                         # Check if rule file is enabled
1314                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1315                                 $rulechecked = 'CHECKED';
1316                         }
1317
1318                         # Convert rulefile name into category name.
1319                         my $categoryname = &_rulefile_to_category($rulefile);
1320
1321                         # Table and rows for the rule files.
1322                         print"<tr>\n";
1323                         print"<td class='base' width='5%'>\n";
1324                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1325                         print"</td>\n";
1326                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1327                         print"<td class='base' width='5%' align='right'>\n";
1328                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1329                         print"</td>\n";
1330                         print"</tr>\n";
1331
1332                         # Rows which will be hidden per default and will contain the single rules.
1333                         print"<tr  style='display:none' id='$categoryname'>\n";
1334                         print"<td colspan='3'>\n";
1335
1336                         # Local vars
1337                         my $lines;
1338                         my $rows;
1339                         my $col;
1340
1341                         # New table for the single rules.
1342                         print "<table width='100%'>\n";
1343
1344                         # Loop over rule file rules
1345                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1346                                 # Local vars
1347                                 my $ruledefchecked = '';
1348
1349                                 # Skip rulefile itself.
1350                                 next if ($sid eq "Rulefile");
1351
1352                                 # If 2 rules have been displayed, start a new row
1353                                 if (($lines % 2) == 0) {
1354                                         print "</tr><tr>\n";
1355
1356                                         # Increase rows by once.
1357                                         $rows++;
1358                                 }
1359
1360                                 # Colour lines.
1361                                 if ($rows % 2) {
1362                                         $col="bgcolor='$color{'color20'}'";
1363                                 } else {
1364                                         $col="bgcolor='$color{'color22'}'";
1365                                 }
1366
1367                                 # Set rule state
1368                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1369                                         $ruledefchecked = 'CHECKED';
1370                                 }
1371
1372                                 # Create rule checkbox and display rule description
1373                                 print "<td class='base' width='5%' align='right' $col>\n";
1374                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1375                                 print "</td>\n";
1376                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1377
1378                                 # Increment rule count
1379                                 $lines++;
1380                         }
1381
1382                         # If do not have a second rule for row, create empty cell
1383                         if (($lines % 2) != 0) {
1384                                 print "<td class='base'></td>";
1385                         }
1386
1387                         # Close display table
1388                         print "</tr></table></td></tr>";
1389                 }
1390
1391                 # Close display table
1392                 print "</table>";
1393
1394                 print <<END
1395 <table width='100%'>
1396 <tr>
1397         <td width='100%' align='right'>
1398                 <input type='submit' value='$Lang::tr{'fwhost back'}'>
1399                 <input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'>
1400         </td>
1401 </tr>
1402 </table>
1403 </form>
1404 END
1405 ;
1406                 &Header::closebox();
1407         }
1408 }
1409
1410 #
1411 ## Function to show section for add/edit a provider.
1412 #
1413 sub show_add_provider() {
1414         my %used_providers = ();
1415         my @subscription_providers;
1416
1417         # Read -in providers settings file.
1418         &General::readhasharray("$IDS::providers_settings_file", \%used_providers);
1419
1420         # Get all supported ruleset providers.
1421         my @ruleset_providers = &IDS::get_ruleset_providers();
1422
1423         ### Java Script ###
1424         print "<script>\n";
1425
1426         # Generate Java Script Object which contains the URL of the providers.
1427         print "\t// Object, which contains the webpages of the ruleset providers.\n";
1428         print "\tvar url = {\n";
1429
1430         # Loop through the array of supported providers.
1431         foreach my $provider (@ruleset_providers) {
1432                 # Check if the provider requires a subscription.
1433                 if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
1434                         # Add the provider to the array of subscription_providers.
1435                         push(@subscription_providers, $provider);
1436                 }
1437
1438                 # Grab the URL for the provider.
1439                 my $url = $IDS::Ruleset::Providers{$provider}{'website'};
1440
1441                 # Print the URL to the Java Script Object.
1442                 print "\t\t$provider: \"$url\"\,\n";
1443         }
1444
1445         # Close the Java Script Object declaration.
1446         print "\t}\;\n\n";
1447
1448         # Generate Java Script Array which contains the provider that requires a subscription.
1449         my $line = "";
1450         $line = join("', '", @subscription_providers);
1451
1452         print "\t// Array which contains the providers that requires a subscription.\n";
1453         print "\tsubscription_provider = ['$line']\;\n\n";
1454
1455 print <<END
1456         // Java Script function to swap the text input field for
1457         // entering a subscription code.
1458         var update_provider = function() {
1459                 if(inArray(\$('#PROVIDER').val(), subscription_provider)) {
1460                         \$('.subscription_code').show();
1461                 } else {
1462                         \$('.subscription_code').hide();
1463                 }
1464
1465                 // Call function to change the website url.
1466                 change_url(\$('#PROVIDER').val());
1467         };
1468
1469         // Java Script function to check if a given value is part of
1470         // an array.
1471         function inArray(value,array) {
1472                 var count=array.length;
1473
1474                 for(var i=0;i<count;i++) {
1475                         if(array[i]===value){
1476                                 return true;
1477                         }
1478                 }
1479
1480                 return false;
1481         }
1482
1483         // Tiny function to change the website url based on the selected element in the "PROVIDERS"
1484         // dropdown menu.
1485         function change_url(provider) {
1486                 // Get and change the href to the corresponding url.
1487                 document.getElementById("website").href = url[provider];
1488         }
1489
1490         // JQuery function to call corresponding function when
1491         // the ruleset provider is changed or the page is loaded for showing/hiding
1492         // the subscription_code area.
1493         \$(document).ready(function() {
1494                 \$('#PROVIDER').change(update_provider);
1495                         update_provider();
1496         });
1497
1498         </script>
1499 END
1500 ;
1501
1502         &Header::openbox('100%', 'center', $Lang::tr{'ids provider settings'});
1503
1504         # Check if an existing provider should be edited.
1505         if($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1506                 # Check if autoupdate is enabled for this provider.
1507                 if ($used_providers{$cgiparams{'ID'}}[2] eq "enabled") {
1508                         # Set the checkbox to be checked.
1509                         $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1510                 }
1511         } elsif ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'ids add provider'}") {
1512                 # Set the autoupdate to true as default.
1513                 $checked{'ENABLE_AUTOUPDATE'} = "checked='checked'";
1514         }
1515
1516 print <<END
1517         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1518                 <table width='100%' border='0'>
1519                         <tr>
1520                                 <td colspan='2'><b>$Lang::tr{'ids provider'}</b></td>
1521                         </tr>
1522
1523                         <tr>
1524                                 <td width='40%'>
1525                                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1526                                         <select name='PROVIDER' id='PROVIDER'>
1527 END
1528 ;
1529                                                 # Loop through the array of ruleset providers.
1530                                                 foreach my $provider (@ruleset_providers) {
1531                                                         # Get the provider name.
1532                                                         my $provider_name = &get_provider_name($provider);
1533
1534                                                         # Pre-select the provider if one is given.
1535                                                         if (($used_providers{$cgiparams{'ID'}}[0] eq "$provider") || ($cgiparams{'PROVIDER'} eq "$provider")) {
1536                                                                 $selected{$provider} = "selected='selected'";
1537                                                         }
1538
1539                                                         # Add the provider to the dropdown menu.
1540                                                         print "<option value='$provider' $selected{$provider}>$provider_name</option>\n";
1541                                                 }
1542 print <<END
1543                                         </select>
1544                                 </td>
1545
1546                                 <td width='60%'>
1547                                         <b><a id="website" target="_blank" href="#">$Lang::tr{'ids visit provider website'}</a></b>
1548                                 </td>
1549                         </tr>
1550
1551                         <tr>
1552                                 <td colspan='2'><br><br></td>
1553                         </tr>
1554
1555                         <tr class='subscription_code' style='display:none' id='subscription_code'>
1556                                 <td colspan='2'>
1557                                         <table border='0'>
1558                                                 <tr>
1559                                                         <td>
1560                                                                 <b>$Lang::tr{'subscription code'}</b>
1561                                                         </td>
1562                                                 </tr>
1563
1564                                                 <tr>
1565                                                         <td>
1566                                                                 <input type='text' size='40' name='SUBSCRIPTION_CODE' value='$used_providers{$cgiparams{'ID'}}[1]'>
1567                                                         </td>
1568                                                 </tr>
1569
1570                                                 <tr>
1571                                                         <td><br><br></td>
1572                                                 </tr>
1573                                         </table>
1574                                 </td>
1575                         </tr>
1576
1577                         <tr>
1578                                 <td colspan='2'>
1579                                         <input type='checkbox' name='ENABLE_AUTOUPDATE' $checked{'ENABLE_AUTOUPDATE'}>&nbsp;$Lang::tr{'ids enable automatic updates'}
1580                                 </td>
1581                         </tr>
1582
1583                         <tr>
1584                                 <td colspan='2' align='right'>
1585                                         <input type='submit' value='$Lang::tr{'back'}'>
1586 END
1587 ;
1588                                 # Check if a provider should be added or edited.
1589                                 if ($cgiparams{'PROVIDERS'} eq "$Lang::tr{'edit'}") {
1590                                         # Display button for updating the existing provider.
1591                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'update'}'>\n";
1592                                 } else {
1593                                         # Display button to add the new provider.
1594                                         print "<input type='submit' name='PROVIDERS' value='$Lang::tr{'add'}'>\n";
1595                                 }
1596 print <<END
1597                                 </td>
1598                         </tr>
1599                 </table>
1600         </form>
1601 END
1602 ;
1603         &Header::closebox();
1604 }
1605
1606 #
1607 ## A function to display a notice, to lock the webpage and
1608 ## tell the user which action currently will be performed.
1609 #
1610 sub working_notice ($) {
1611         my ($message) = @_;
1612
1613         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1614         &Header::openbigbox('100%', 'left', '', $errormessage);
1615         &Header::openbox( 'Waiting', 1,);
1616                 print <<END;
1617                         <table>
1618                                 <tr>
1619                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1620                                         <td>$message</td>
1621                                 </tr>
1622                         </table>
1623 END
1624         &Header::closebox();
1625         &Header::closebigbox();
1626         &Header::closepage();
1627 }
1628
1629 #
1630 ## A tiny function to perform a reload of the webpage after one second.
1631 #
1632 sub reload () {
1633         print "<meta http-equiv='refresh' content='1'>\n";
1634
1635         # Stop the script.
1636         exit;
1637 }
1638
1639 #
1640 ## Private function to read-in and parse rules of a given rulefile.
1641 #
1642 ## The given file will be read, parsed and all valid rules will be stored by ID,
1643 ## message/description and it's state in the idsrules hash.
1644 #
1645 sub readrulesfile ($) {
1646         my $rulefile = shift;
1647
1648         # Open rule file and read in contents
1649         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1650
1651         # Store file content in an array.
1652         my @lines = <RULEFILE>;
1653
1654         # Close file.
1655         close(RULEFILE);
1656
1657         # Loop over rule file contents
1658         foreach my $line (@lines) {
1659                 # Remove whitespaces.
1660                 chomp $line;
1661
1662                 # Skip blank  lines.
1663                 next if ($line =~ /^\s*$/);
1664
1665                 # Local vars.
1666                 my $sid;
1667                 my $msg;
1668
1669                 # Gather rule sid and message from the ruleline.
1670                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1671                         $msg = $1;
1672                         $sid = $2;
1673
1674                         # Check if a rule has been found.
1675                         if ($sid && $msg) {
1676                                 # Add rule to the idsrules hash.
1677                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1678
1679                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1680                                 if ($line =~ /^\#/) {
1681                                         # If yes, the rule is disabled.
1682                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1683                                 } else {
1684                                         # Otherwise the rule is enabled.
1685                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1686                                 }
1687                         }
1688                 }
1689         }
1690 }
1691
1692 #
1693 ## Function to get the used memory of a given process-id.
1694 #
1695 sub get_memory_usage($) {
1696         my ($pid) = @_;
1697
1698         my $memory = 0;
1699
1700         # Try to open the status file for the given process-id on the pseudo
1701         # file system proc.
1702         if (open(FILE, "/proc/$pid/status")) {
1703                 # Loop through the entire file.
1704                 while (<FILE>) {
1705                         # Splitt current line content and store them into variables.
1706                         my ($key, $value) = split(":", $_, 2);
1707
1708                         # Check if the current key is the one which contains the memory usage.
1709                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1710                         # of the entire process.
1711                         if ($key eq "VmRSS") {
1712                                 # Found the memory usage add it to the memory variable.
1713                                 $memory += $value;
1714
1715                                 # Break the loop.
1716                                 last;
1717                         }
1718                 }
1719
1720                 # Close file handle.
1721                 close(FILE);
1722
1723                 # Return memory usage.
1724                 return $memory;
1725         }
1726
1727         # If the file could not be open, return nothing.
1728         return;
1729 }
1730
1731 #
1732 ## Function to read-in the given enabled or disables sids file.
1733 #
1734 sub read_enabled_disabled_sids_file($) {
1735         my ($file) = @_;
1736
1737         # Temporary hash to store the sids and their state. It will be
1738         # returned at the end of this function.
1739         my %temphash;
1740
1741         # Open the given filename.
1742         open(FILE, "$file") or die "Could not open $file. $!\n";
1743
1744         # Loop through the file.
1745         while(<FILE>) {
1746                 # Remove newlines.
1747                 chomp $_;
1748
1749                 # Skip blank lines.
1750                 next if ($_ =~ /^\s*$/);
1751
1752                 # Skip coments.
1753                 next if ($_ =~ /^\#/);
1754
1755                 # Splitt line into sid and state part.
1756                 my ($state, $sid) = split(" ", $_);
1757
1758                 # Skip line if the sid is not numeric.
1759                 next unless ($sid =~ /\d+/ );
1760
1761                 # Check if the sid was enabled.
1762                 if ($state eq "enablesid") {
1763                         # Add the sid and its state as enabled to the temporary hash.
1764                         $temphash{$sid} = "enabled";
1765                 # Check if the sid was disabled.
1766                 } elsif ($state eq "disablesid") {
1767                         # Add the sid and its state as disabled to the temporary hash.
1768                         $temphash{$sid} = "disabled";
1769                 # Invalid state - skip the current sid and state.
1770                 } else {
1771                         next;
1772                 }
1773         }
1774
1775         # Close filehandle.
1776         close(FILE);
1777
1778         # Return the hash.
1779         return %temphash;
1780 }
1781
1782 #
1783 ## Function to get the provider name from the language file or providers file for a given handle.
1784 #
1785 sub get_provider_name($) {
1786         my ($handle) = @_;
1787         my $provider_name;
1788
1789         # Get the required translation string for the given provider handle.
1790         my $tr_string = $IDS::Ruleset::Providers{$handle}{'tr_string'};
1791
1792         # Check if the translation string is available in the language files.
1793         if ($Lang::tr{$tr_string}) {
1794                 # Use the translated string from the language file.
1795                 $provider_name = $Lang::tr{$tr_string};
1796         } else {
1797                 # Fallback and use the provider summary from the providers file.
1798                 $provider_name = $IDS::Ruleset::Providers{$handle}{'summary'};
1799         }
1800
1801         # Return the obtained provider name.
1802         return $provider_name;
1803 }
1804
1805 #
1806 ## Private function to convert a given rulefile to a category name.
1807 ## ( No file extension anymore and if the name contained a dot, it
1808 ## would be replaced by a underline sign.)
1809 #
1810 sub _rulefile_to_category($) {
1811         my ($filename) = @_;
1812
1813         # Splitt the filename into single chunks and store them in a
1814         # temorary array.
1815         my @parts = split(/\./, $filename);
1816
1817         # Return / Remove last element of the temporary array.
1818         # This removes the file extension.
1819         pop @parts;
1820
1821         # Join together the single elements of the temporary array.
1822         # If these are more than one, use a "underline" for joining.
1823         my $category = join '_', @parts;
1824
1825         # Return the converted filename.
1826         return $category;
1827 }