html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulessettings=();
  38 my %rulesetsources = ();
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42 my %ignored=();
  43
  44 # Read-in main settings, for language, theme and colors.
  45 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  46 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  47
  48 # Get the available network zones, based on the config type of the system and store
  49 # the list of zones in an array.
  50 my @network_zones = &IDS::get_available_network_zones();
  51
  52 # File where the used rulefiles are stored.
  53 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
  54
  55 # File where the addresses of the homenet are stored.
  56 my $idshomenetfile = "$IDS::settingsdir/suricata-homenet.yaml";
  57
  58 # File which contains the enabled sids.
  59 my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
  60
  61 # File which contains the disabled sids.
  62 my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
  63
  64 # File which contains wheater the rules should be changed.
  65 my $modify_sids_file = "$IDS::settingsdir/oinkmaster-modify-sids.conf";
  66
  67 # File which stores the configured IPS settings.
  68 my $idssettingsfile = "$IDS::settingsdir/settings";
  69
  70 # File which stores the configured rules-settings.
  71 my $rulessettingsfile = "$IDS::settingsdir/rules-settings";
  72
  73 # File which stores the configured settings for whitelisted addresses.
  74 my $ignoredfile = "$IDS::settingsdir/ignored";
  75
  76 # File which contains the rules to whitelist addresses on suricata.
  77 my $whitelistfile = "$IDS::rulespath/whitelist.rules";
  78
  79 my $errormessage;
  80
  81 # Create files if they does not exist yet.
  82 unless (-f "$enabled_sids_file") { &IDS::create_empty_file($enabled_sids_file); }
  83 unless (-f "$disabled_sids_file") { &IDS::create_empty_file($disabled_sids_file); }
  84 unless (-f "$modify_sids_file") { &IDS::create_empty_file($modify_sids_file); }
  85 unless (-f "$idsusedrulefilesfile") { &IDS::create_empty_file($idsusedrulefilesfile); }
  86 unless (-f "$idssettingsfile") { &IDS::create_empty_file($idssettingsfile); }
  87 unless (-f "$rulessettingsfile") { &IDS::create_empty_file($rulessettingsfile); }
  88 unless (-f "$ignoredfile") { &IDS::create_empty_file($ignoredfile); }
  89 unless (-f "$whitelistfile" ) { &IDS::create_empty_file($whitelistfile); }
  90
  91 &Header::showhttpheaders();
  92
  93 #Get GUI values
  94 &Header::getcgihash(\%cgiparams);
  95
  96 ## Add/edit an entry to the ignore file.
  97 #
  98 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  99
 100         # Check if any input has been performed.
 101         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
 102
 103                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
 104                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
 105                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
 106                 }
 107         } else {
 108                 $errormessage = "$Lang::tr{'guardian empty input'}";
 109         }
 110
 111         # Go further if there was no error.
 112         if ($errormessage eq '') {
 113                 my %ignored = ();
 114                 my $id;
 115                 my $status;
 116
 117                 # Assign hash values.
 118                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 119                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 120
 121                 # Read-in ignoredfile.
 122                 &General::readhasharray($ignoredfile, \%ignored);
 123
 124                 # Check if we should edit an existing entry and got an ID.
 125                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 126                         # Assin the provided id.
 127                         $id = $cgiparams{'ID'};
 128
 129                         # Undef the given ID.
 130                         undef($cgiparams{'ID'});
 131
 132                         # Grab the configured status of the corresponding entry.
 133                         $status = $ignored{$id}[2];
 134                 } else {
 135                         # Each newly added entry automatically should be enabled.
 136                         $status = "enabled";
 137
 138                         # Generate the ID for the new entry.
 139                         #
 140                         # Sort the keys by their ID and store them in an array.
 141                         my @keys = sort { $a <=> $b } keys %ignored;
 142
 143                         # Reverse the key array.
 144                         my @reversed = reverse(@keys);
 145
 146                         # Obtain the last used id.
 147                         my $last_id = @reversed[0];
 148
 149                         # Increase the last id by one and use it as id for the new entry.
 150                         $id = ++$last_id;
 151                 }
 152
 153                 # Add/Modify the entry to/in the ignored hash.
 154                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 155
 156                 # Write the changed ignored hash to the ignored file.
 157                 &General::writehasharray($ignoredfile, \%ignored);
 158
 159                 # Regenerate the ignore file.
 160                 &GenerateIgnoreFile();
 161         }
 162
 163         # Check if the IDS is running.
 164         if(&IDS::ids_is_running()) {
 165                 # Call suricatactrl to perform a reload.
 166                 &IDS::call_suricatactrl("reload");
 167         }
 168
 169 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 170 #
 171
 172 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 173         my %ignored = ();
 174
 175         # Only go further, if an ID has been passed.
 176         if ($cgiparams{'ID'}) {
 177                 # Assign the given ID.
 178                 my $id = $cgiparams{'ID'};
 179
 180                 # Undef the given ID.
 181                 undef($cgiparams{'ID'});
 182
 183                 # Read-in ignoredfile.
 184                 &General::readhasharray($ignoredfile, \%ignored);
 185
 186                 # Grab the configured status of the corresponding entry.
 187                 my $status = $ignored{$id}[2];
 188
 189                 # Switch the status.
 190                 if ($status eq "disabled") {
 191                         $status = "enabled";
 192                 } else {
 193                         $status = "disabled";
 194                 }
 195
 196                 # Modify the status of the existing entry.
 197                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 198
 199                 # Write the changed ignored hash to the ignored file.
 200                 &General::writehasharray($ignoredfile, \%ignored);
 201
 202                 # Regenerate the ignore file.
 203                 &GenerateIgnoreFile();
 204
 205                 # Check if the IDS is running.
 206                 if(&IDS::ids_is_running()) {
 207                         # Call suricatactrl to perform a reload.
 208                         &IDS::call_suricatactrl("reload");
 209                 }
 210         }
 211
 212 ## Remove entry from ignore list.
 213 #
 214 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 215         my %ignored = ();
 216
 217         # Read-in ignoredfile.
 218         &General::readhasharray($ignoredfile, \%ignored);
 219
 220         # Drop entry from the hash.
 221         delete($ignored{$cgiparams{'ID'}});
 222
 223         # Undef the given ID.
 224         undef($cgiparams{'ID'});
 225
 226         # Write the changed ignored hash to the ignored file.
 227         &General::writehasharray($ignoredfile, \%ignored);
 228
 229         # Regenerate the ignore file.
 230         &GenerateIgnoreFile();
 231
 232         # Check if the IDS is running.
 233         if(&IDS::ids_is_running()) {
 234                 # Call suricatactrl to perform a reload.
 235                 &IDS::call_suricatactrl("reload");
 236         }
 237 }
 238
 239 # Check if any error has been stored.
 240 if (-e $IDS::storederrorfile) {
 241         # Open file to read in the stored error message.
 242         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 243
 244         # Read the stored error message.
 245         $errormessage = <FILE>;
 246
 247         # Close file.
 248         close (FILE);
 249
 250         # Delete the file, which is now not longer required.
 251         unlink($IDS::storederrorfile);
 252 }
 253
 254
 255 ## Grab all available snort rules and store them in the idsrules hash.
 256 #
 257 # Open snort 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 $idsusedrulefilesfile) {
 288         # Open the file for used rulefile and read-in content.
 289         open(FILE, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\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 # Save ruleset configuration.
 324 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 325         my %oldsettings;
 326
 327         # Read-in current (old) IDS settings.
 328         &General::readhash("$rulessettingsfile", \%oldsettings);
 329
 330         # Prevent form name from been stored in conf file.
 331         delete $cgiparams{'RULESET'};
 332
 333         # Check if an oinkcode has been provided.
 334         if ($cgiparams{'OINKCODE'}) {
 335                 # Check if the oinkcode contains unallowed chars.
 336                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 337                         $errormessage = $Lang::tr{'invalid input for oink code'};
 338                 }
 339         }
 340
 341         # Go on if there are no error messages.
 342         if (!$errormessage) {
 343                 # Store settings into settings file.
 344                 &General::writehash("$rulessettingsfile", \%cgiparams);
 345         }
 346
 347         # Check if the the automatic rule update hass been touched.
 348         if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 349                 # Call suricatactrl to set the new interval.
 350                 &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 351         }
 352
 353 # Save ruleset.
 354 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 355         # Arrays to store which rulefiles have been enabled and will be used.
 356         my @enabled_rulefiles;
 357
 358         # Hash to store the user-enabled and disabled sids.
 359         my %enabled_disabled_sids;
 360
 361         # Loop through the hash of idsrules.
 362         foreach my $rulefile(keys %idsrules) {
 363                 # Check if the rulefile is enabled.
 364                 if ($cgiparams{$rulefile} eq "on") {
 365                         # Add rulefile to the array of enabled rulefiles.
 366                         push(@enabled_rulefiles, $rulefile);
 367
 368                         # Drop item from cgiparams hash.
 369                         delete $cgiparams{$rulefile};
 370                 }
 371         }
 372
 373         # Read-in the files for enabled/disabled sids.
 374         # This will be done by calling the read_enabled_disabled_sids_file function two times
 375         # and merge the returned hashes together into the enabled_disabled_sids hash.
 376         %enabled_disabled_sids = (
 377                 &read_enabled_disabled_sids_file($disabled_sids_file),
 378                 &read_enabled_disabled_sids_file($enabled_sids_file));
 379
 380         # Loop through the hash of idsrules.
 381         foreach my $rulefile (keys %idsrules) {
 382                 # Loop through the single rules of the rulefile.
 383                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 384                         # Skip the current sid if it is not numeric.
 385                         next unless ($sid =~ /\d+/ );
 386
 387                         # Check if there exists a key in the cgiparams hash for this sid.
 388                         if (exists($cgiparams{$sid})) {
 389                                 # Look if the rule is disabled.
 390                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 391                                         # Check if the state has been set to 'on'.
 392                                         if ($cgiparams{$sid} eq "on") {
 393                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 394                                                 $enabled_disabled_sids{$sid} = "enabled";
 395
 396                                                 # Drop item from cgiparams hash.
 397                                                 delete $cgiparams{$rulefile}{$sid};
 398                                         }
 399                                 }
 400                         } else {
 401                                 # Look if the rule is enabled.
 402                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 403                                         # Check if the state is 'on' and should be disabled.
 404                                         # In this case there is no entry
 405                                         # for the sid in the cgiparams hash.
 406                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 407                                         $enabled_disabled_sids{$sid} = "disabled";
 408
 409                                         # Drop item from cgiparams hash.
 410                                         delete $cgiparams{$rulefile}{$sid};
 411                                 }
 412                         }
 413                 }
 414         }
 415
 416         # Open enabled sid's file for writing.
 417         open(ENABLED_FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 418
 419         # Open disabled sid's file for writing.
 420         open(DISABLED_FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 421
 422         # Write header to the files.
 423         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 424         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 425
 426         # Check if the hash for enabled/disabled files contains any entries.
 427         if (%enabled_disabled_sids) {
 428                 # Loop through the hash.
 429                 foreach my $sid (keys %enabled_disabled_sids) {
 430                         # Check if the sid is enabled.
 431                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 432                                 # Print the sid to the enabled_sids file.
 433                                 print ENABLED_FILE "enablesid $sid\n";
 434                         # Check if the sid is disabled.
 435                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 436                                 # Print the sid to the disabled_sids file.
 437                                 print DISABLED_FILE "disablesid $sid\n";
 438                         # Something strange happende - skip the current sid.
 439                         } else {
 440                                 next;
 441                         }
 442                 }
 443         }
 444
 445         # Close file for enabled_sids after writing.
 446         close(ENABLED_FILE);
 447
 448         # Close file for disabled_sids after writing.
 449         close(DISABLED_FILE);
 450
 451         # Open file for used rulefiles.
 452         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 453
 454         # Write yaml header to the file.
 455         print FILE "%YAML 1.1\n";
 456         print FILE "---\n\n";
 457
 458         # Write header to file.
 459         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 460
 461         # Allways load the whitelist.
 462         print FILE " - whitelist.rules\n";
 463
 464         # Check if the enabled_rulefiles array contains any entries.
 465         if (@enabled_rulefiles) {
 466                 # Loop through the array of rulefiles which should be loaded and write them to the file.
 467                 foreach my $file (@enabled_rulefiles) {
 468                         print FILE " - $file\n";
 469                 }
 470         }
 471
 472         # Close file after writing.
 473         close(FILE);
 474
 475         # Lock the webpage and print message.
 476         &working_notice("$Lang::tr{'snort working'}");
 477
 478         # Call oinkmaster to alter the ruleset.
 479         &IDS::oinkmaster();
 480
 481         # Check if the IDS is running.
 482         if(&IDS::ids_is_running()) {
 483                 # Call suricatactrl to perform a reload.
 484                 &IDS::call_suricatactrl("reload");
 485         }
 486
 487         # Reload page.
 488         &reload();
 489
 490 # Download new ruleset.
 491 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 492         # Check if the red device is active.
 493         unless (-e "${General::swroot}/red/active") {
 494                 $errormessage = $Lang::tr{'could not download latest updates'};
 495         }
 496
 497         # Check if enought free disk space is availabe.
 498         if(&IDS::checkdiskspace()) {
 499                 $errormessage = "$Lang::tr{'not enough disk space'}";
 500         }
 501
 502         # Check if any errors happend.
 503         unless ($errormessage) {
 504                 # Lock the webpage and print notice about downloading
 505                 # a new ruleset.
 506                 &working_notice("$Lang::tr{'snort working'}");
 507
 508                 # Call subfunction to download the ruleset.
 509                 if(&IDS::downloadruleset()) {
 510                         $errormessage = $Lang::tr{'could not download latest updates'};
 511
 512                         # Call function to store the errormessage.
 513                         &IDS::_store_error_message($errormessage);
 514
 515                         # Preform a reload of the page.
 516                         &reload();
 517                 } else {
 518                         # Call subfunction to launch oinkmaster.
 519                         &IDS::oinkmaster();
 520
 521                         # Check if the IDS is running.
 522                         if(&IDS::ids_is_running()) {
 523                                 # Call suricatactrl to perform a reload.
 524                                 &IDS::call_suricatactrl("reload");
 525                         }
 526
 527                         # Perform a reload of the page.
 528                         &reload();
 529                 }
 530         }
 531 # Save snort settings.
 532 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 533         my %oldidssettings;
 534         my $reload_page;
 535         my $monitored_zones = 0;
 536
 537         # Read-in current (old) IDS settings.
 538         &General::readhash("$idssettingsfile", \%oldidssettings);
 539
 540         # Prevent form name from been stored in conf file.
 541         delete $cgiparams{'IDS'};
 542
 543         # Check if the IDS should be enabled.
 544         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 545                 # Check if any ruleset is available. Otherwise abort and display an error.
 546                 unless(%idsrules) {
 547                         $errormessage = $Lang::tr{'ids no ruleset available'};
 548                 }
 549
 550                 # Loop through the array of available interfaces.
 551                 foreach my $zone (@network_zones) {
 552                         # Convert interface name into upper case.
 553                         my $zone_upper = uc($zone);
 554
 555                         # Check if the IDS is enabled for this interaces.
 556                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 557                                 # Increase count.
 558                                 $monitored_zones++;
 559                         }
 560                 }
 561
 562                 # Check if at least one zone should be monitored, or show an error.
 563                 unless ($monitored_zones >= 1) {
 564                         $errormessage = $Lang::tr{'ids no network zone'};
 565                 }
 566         }
 567
 568         # Go on if there are no error messages.
 569         if (!$errormessage) {
 570                 # Store settings into settings file.
 571                 &General::writehash("$idssettingsfile", \%cgiparams);
 572         }
 573
 574         # Generate file to store the home net.
 575         &generate_home_net_file();
 576
 577         # Check if the runmode has been changed.
 578         if($cgiparams{'RUN_MODE'} ne $oldidssettings{'RUN_MODE'}) {
 579                 # Open modify sid's file for writing.
 580                 open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
 581
 582                 # Write file header.
 583                 print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 584
 585                 # Check if the configured runmode is IPS.
 586                 if ($cgiparams{'RUN_MODE'} eq 'IPS') {
 587                         # Tell oinkmaster to switch all rules from alert to drop.
 588                         print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 589                 }
 590
 591                 # Close file handle.
 592                 close(FILE);
 593
 594                 # Check if a ruleset exists.
 595                 if (%idsrules) {
 596                         # Lock the webpage and print message.
 597                         &working_notice("$Lang::tr{'snort working'}");
 598
 599                         # Call oinkmaster to alter the ruleset.
 600                         &IDS::oinkmaster();
 601
 602                         # Set reload_page to "True".
 603                         $reload_page="True";
 604                 }
 605         }
 606
 607         # Check if the IDS currently is running.
 608         if(&IDS::ids_is_running()) {
 609                 # Check if ENABLE_IDS is set to on.
 610                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 611                         # Call suricatactrl to perform a reload of suricata.
 612                         &IDS::call_suricatactrl("reload");
 613                 } else {
 614                         # Call suricatactrl to stop suricata.
 615                         &IDS::call_suricatactrl("stop");
 616                 }
 617         } else {
 618                 # Call suricatactrl to start suricata.
 619                 &IDS::call_suricatactrl("start");
 620         }
 621
 622         # Check if the page should be reloaded.
 623         if ($reload_page) {
 624                 # Perform a reload of the page.
 625                 &reload();
 626         }
 627 }
 628
 629 # Read-in idssettings and rulesetsettings
 630 &General::readhash("$idssettingsfile", \%idssettings);
 631 &General::readhash("$rulessettingsfile", \%rulessettings);
 632
 633 # If the runmode has not been configured yet, set default value.
 634 unless(exists($idssettings{'RUN_MODE'})) {
 635         # Set default to IPS.
 636         $idssettings{'RUN_MODE'} = 'IPS';
 637 }
 638
 639 # If no autoupdate intervall has been configured yet, set default value.
 640 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 641         # Set default to "weekly".
 642         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 643 }
 644
 645 # Read-in ignored hosts.
 646 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 647
 648 $checked{'ENABLE_IDS'}{'off'} = '';
 649 $checked{'ENABLE_IDS'}{'on'} = '';
 650 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 651 $checked{'RUN_MODE'}{'IDS'} = '';
 652 $checked{'RUN_MODE'}{'IPS'} = '';
 653 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
 654 $selected{'RULES'}{'nothing'} = '';
 655 $selected{'RULES'}{'community'} = '';
 656 $selected{'RULES'}{'emerging'} = '';
 657 $selected{'RULES'}{'registered'} = '';
 658 $selected{'RULES'}{'subscripted'} = '';
 659 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 660 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 661 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 662 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 663 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 664
 665 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 666
 667 ### Java Script ###
 668 print <<END
 669 <script>
 670         // Tiny java script function to show/hide the rules
 671         // of a given category.
 672         function showhide(tblname) {
 673                 \$("#" + tblname).toggle();
 674         }
 675 </script>
 676 END
 677 ;
 678
 679 &Header::openbigbox('100%', 'left', '', $errormessage);
 680
 681 if ($errormessage) {
 682         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 683         print "<class name='base'>$errormessage\n";
 684         print "&nbsp;</class>\n";
 685         &Header::closebox();
 686 }
 687
 688 # Draw current state of the IDS
 689 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 690
 691 # Check if the IDS is running and obtain the process-id.
 692 my $pid = &IDS::ids_is_running();
 693
 694 # Display some useful information, if suricata daemon is running.
 695 if ($pid) {
 696         # Gather used memory.
 697         my $memory = &get_memory_usage($pid);
 698
 699         print <<END;
 700                 <table width='95%' cellspacing='0' class='tbl'>
 701                         <tr>
 702                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 703                         </tr>
 704
 705                         <tr>
 706                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 707                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 708                         </tr>
 709
 710                         <tr>
 711                                 <td class='base'></td>
 712                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 713                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 714                         </tr>
 715
 716                         <tr>
 717                                 <td class='base'></td>
 718                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 719                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 720                         </tr>
 721                 </table>
 722 END
 723 } else {
 724         # Otherwise display a hint that the service is not launched.
 725         print <<END;
 726                 <table width='95%' cellspacing='0' class='tbl'>
 727                         <tr>
 728                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 729                         </tr>
 730
 731                         <tr>
 732                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 733                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 734                         </tr>
 735                 </table>
 736 END
 737 }
 738 &Header::closebox();
 739
 740 # Draw elements for IDS configuration.
 741 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 742
 743 print <<END
 744 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 745         <table width='100%' border='0'>
 746                 <tr>
 747                         <td class='base' colspan='4'>
 748                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 749                         </td>
 750                 </tr>
 751
 752                 <tr>
 753                         <td colspan='4'><br><br></td>
 754                 </tr>
 755
 756                 <tr>
 757                         <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
 758                 </tr>
 759
 760                 <tr>
 761                         <td class='base' colspan='4'>
 762                                 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'} &nbsp&nbsp&nbsp
 763                                 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
 764                         </td>
 765                 </tr>
 766
 767                 <tr>
 768                         <td colspan='4'><br></td>
 769                 </tr>
 770
 771                 <tr>
 772                         <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
 773                 </tr>
 774
 775                 <tr>
 776 END
 777 ;
 778
 779 # Loop through the array of available networks and print config options.
 780 foreach my $zone (@network_zones) {
 781         my $checked_input;
 782         my $checked_forward;
 783
 784         # Convert current zone name to upper case.
 785         my $zone_upper = uc($zone);
 786
 787         # Grab checkbox status from settings hash.
 788         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 789                 $checked_input = "checked = 'checked'";
 790         }
 791
 792         print "<td class='base' width='25%'>\n";
 793         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
 794         print "</td>\n";
 795 }
 796
 797 print <<END
 798                 </tr>
 799         </table>
 800
 801         <br><br>
 802
 803         <table width='100%'>
 804                 <tr>
 805                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 806                 </tr>
 807         </table>
 808 </form>
 809 END
 810 ;
 811
 812 &Header::closebox();
 813
 814 # Draw elements for ruleset configuration.
 815 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 816
 817 my $rulesdate;
 818
 819 # Check if a ruleset allready has been downloaded.
 820 if ( -f "$IDS::rulestarball"){
 821         # Call stat on the filename to obtain detailed information.
 822         my @Info = stat("$IDS::rulestarball");
 823
 824         # Grab details about the creation time.
 825         $rulesdate = localtime($Info[9]);
 826 }
 827
 828 print <<END
 829 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 830         <table width='100%' border='0'>
 831                 <tr>
 832                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 833                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 834                 </tr>
 835
 836                 <tr>
 837                         <td><select name='RULES'>
 838                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 839                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 840                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 841                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 842                         </select>
 843                         </td>
 844
 845                         <td>
 846                                 <select name='AUTOUPDATE_INTERVAL'>
 847                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >$Lang::tr{'no'}</option>
 848                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'urlfilter daily'}</option>
 849                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'urlfilter weekly'}</option>
 850                                 </select>
 851                         </td>
 852                 </tr>
 853
 854                 <tr>
 855                         <td colspan='2'>
 856                                 <br>$Lang::tr{'ids rules license'} <a href='https://www.snort.org/subscribe' target='_blank'>www.snort.org</a>$Lang::tr{'ids rules license1'}</br>
 857                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 858                         </td>
 859                 </tr>
 860
 861                 <tr>
 862                         <td colspan='2' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 863                 </tr>
 864
 865                 <tr>
 866                         <td>&nbsp;</td>
 867
 868                         <td align='right'>
 869 END
 870 ;
 871                 # Check if a ruleset source has been configured yet.
 872                 unless($rulessettings{'RULES'}) {
 873                         # If no ruleset settings have been saved yet, disable the button to download / update the ruleset.
 874                         print"<input type='submit' name='RULESET' disabled='disabled' value='$Lang::tr{'download new ruleset'}'>\n";
 875                 } else {
 876                         # Ruleset setting have been saved. - Check if a ruleset already is downloaded.
 877                         if (%idsrules) {
 878                                 # Allow to press the button and show it as "update ruleset".
 879                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 880                         } else {
 881                                 # Also allow to press the button, but show it as "download new ruleset".
 882                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>\n";
 883                         }
 884                 }
 885 print <<END;
 886                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 887                         </td>
 888
 889                 </tr>
 890         </table>
 891 </form>
 892 END
 893 ;
 894
 895 &Header::closebox();
 896
 897 #
 898 # Whitelist / Ignorelist
 899 #
 900 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 901
 902 print <<END;
 903         <table width='100%'>
 904                 <tr>
 905                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 906                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 907                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 908                 </tr>
 909 END
 910                 # Check if some hosts have been added to be ignored.
 911                 if (keys (%ignored)) {
 912                         my $col = "";
 913
 914                         # Loop through all entries of the hash.
 915                         while( (my $key) = each %ignored)  {
 916                                 # Assign data array positions to some nice variable names.
 917                                 my $address = $ignored{$key}[0];
 918                                 my $remark = $ignored{$key}[1];
 919                                 my $status  = $ignored{$key}[2];
 920
 921                                 # Check if the key (id) number is even or not.
 922                                 if ($cgiparams{'ID'} eq $key) {
 923                                         $col="bgcolor='${Header::colouryellow}'";
 924                                 } elsif ($key % 2) {
 925                                         $col="bgcolor='$color{'color22'}'";
 926                                 } else {
 927                                         $col="bgcolor='$color{'color20'}'";
 928                                 }
 929
 930                                 # Choose icon for the checkbox.
 931                                 my $gif;
 932                                 my $gdesc;
 933
 934                                 # Check if the status is enabled and select the correct image and description.
 935                                 if ($status eq 'enabled' ) {
 936                                         $gif = 'on.gif';
 937                                         $gdesc = $Lang::tr{'click to disable'};
 938                                 } else {
 939                                         $gif = 'off.gif';
 940                                         $gdesc = $Lang::tr{'click to enable'};
 941                                 }
 942
 943 print <<END;
 944                                 <tr>
 945                                         <td width='20%' class='base' $col>$address</td>
 946                                         <td width='65%' class='base' $col>$remark</td>
 947
 948                                         <td align='center' $col>
 949                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 950                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 951                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 952                                                         <input type='hidden' name='ID' value='$key' />
 953                                                 </form>
 954                                         </td>
 955
 956                                         <td align='center' $col>
 957                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 958                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 959                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 960                                                         <input type='hidden' name='ID' value='$key' />
 961                                                 </form>
 962                                         </td>
 963
 964                                         <td align='center' $col>
 965                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 966                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 967                                                         <input type='hidden' name='ID' value='$key'>
 968                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 969                                                 </form>
 970                                         </td>
 971                                 </tr>
 972 END
 973                         }
 974                 } else {
 975                         # Print notice that currently no hosts are ignored.
 976                         print "<tr>\n";
 977                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 978                         print "</tr>\n";
 979                 }
 980
 981         print "</table>\n";
 982
 983         # Section to add new elements or edit existing ones.
 984 print <<END;
 985         <br>
 986         <hr>
 987         <br>
 988
 989         <div align='center'>
 990                 <table width='100%'>
 991 END
 992
 993         # Assign correct headline and button text.
 994         my $buttontext;
 995         my $entry_address;
 996         my $entry_remark;
 997
 998         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 999         if ($cgiparams{'ID'} ne '') {
1000                 $buttontext = $Lang::tr{'update'};
1001                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1002
1003                         # Grab address and remark for the given key.
1004                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1005                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1006                 } else {
1007                         $buttontext = $Lang::tr{'add'};
1008                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1009                 }
1010
1011 print <<END;
1012                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1013                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1014                         <tr>
1015                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1016                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1017
1018                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1019                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1020                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1021                         </tr>
1022                         </form>
1023                 </table>
1024         </div>
1025 END
1026
1027 &Header::closebox();
1028
1029 # Only show the section for configuring the ruleset if one is present.
1030 if (%idsrules) {
1031         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
1032
1033                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1034
1035                 # Output display table for rule files
1036                 print "<table width='100%'>\n";
1037
1038                 # Loop over each rule file
1039                 foreach my $rulefile (sort keys(%idsrules)) {
1040                         my $rulechecked = '';
1041
1042                         # Check if rule file is enabled
1043                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1044                                 $rulechecked = 'CHECKED';
1045                         }
1046
1047                         # Convert rulefile name into category name.
1048                         my $categoryname = &_rulefile_to_category($rulefile);
1049
1050                         # Table and rows for the rule files.
1051                         print"<tr>\n";
1052                         print"<td class='base' width='5%'>\n";
1053                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1054                         print"</td>\n";
1055                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1056                         print"<td class='base' width='5%' align='right'>\n";
1057                         print"<a href=\"javascript:showhide('$categoryname')\">SHOW</a>\n";
1058                         print"</td>\n";
1059                         print"</tr>\n";
1060
1061                         # Rows which will be hidden per default and will contain the single rules.
1062                         print"<tr  style='display:none' id='$categoryname'>\n";
1063                         print"<td colspan='3'>\n";
1064
1065                         # Local vars
1066                         my $lines;
1067                         my $rows;
1068                         my $col;
1069
1070                         # New table for the single rules.
1071                         print "<table width='100%'>\n";
1072
1073                         # Loop over rule file rules
1074                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1075                                 # Local vars
1076                                 my $ruledefchecked = '';
1077
1078                                 # Skip rulefile itself.
1079                                 next if ($sid eq "Rulefile");
1080
1081                                 # If 2 rules have been displayed, start a new row
1082                                 if (($lines % 2) == 0) {
1083                                         print "</tr><tr>\n";
1084
1085                                         # Increase rows by once.
1086                                         $rows++;
1087                                 }
1088
1089                                 # Colour lines.
1090                                 if ($rows % 2) {
1091                                         $col="bgcolor='$color{'color20'}'";
1092                                 } else {
1093                                         $col="bgcolor='$color{'color22'}'";
1094                                 }
1095
1096                                 # Set rule state
1097                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1098                                         $ruledefchecked = 'CHECKED';
1099                                 }
1100
1101                                 # Create rule checkbox and display rule description
1102                                 print "<td class='base' width='5%' align='right' $col>\n";
1103                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1104                                 print "</td>\n";
1105                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1106
1107                                 # Increment rule count
1108                                 $lines++;
1109                         }
1110
1111                         # If do not have a second rule for row, create empty cell
1112                         if (($lines % 2) != 0) {
1113                                 print "<td class='base'></td>";
1114                         }
1115
1116                         # Close display table
1117                         print "</tr></table></td></tr>";
1118                 }
1119
1120                 # Close display table
1121                 print "</table>";
1122
1123 print <<END
1124 <table width='100%'>
1125 <tr>
1126         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1127                 &nbsp; <!-- space for future online help link -->
1128         </td>
1129 </tr>
1130 </table>
1131 </form>
1132 END
1133 ;
1134         &Header::closebox();
1135 }
1136
1137 &Header::closebigbox();
1138 &Header::closepage();
1139
1140 #
1141 ## A function to display a notice, to lock the webpage and
1142 ## tell the user which action currently will be performed.
1143 #
1144 sub working_notice ($) {
1145         my ($message) = @_;
1146
1147         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1148         &Header::openbigbox('100%', 'left', '', $errormessage);
1149         &Header::openbox( 'Waiting', 1,);
1150                 print <<END;
1151                         <table>
1152                                 <tr>
1153                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1154                                         <td>$message</td>
1155                                 </tr>
1156                         </table>
1157 END
1158         &Header::closebox();
1159         &Header::closebigbox();
1160         &Header::closepage();
1161 }
1162
1163 #
1164 ## A tiny function to perform a reload of the webpage after one second.
1165 #
1166 sub reload () {
1167         print "<meta http-equiv='refresh' content='1'>\n";
1168
1169         # Stop the script.
1170         exit;
1171 }
1172
1173 #
1174 ## Private function to read-in and parse rules of a given rulefile.
1175 #
1176 ## The given file will be read, parsed and all valid rules will be stored by ID,
1177 ## message/description and it's state in the idsrules hash.
1178 #
1179 sub readrulesfile ($) {
1180         my $rulefile = shift;
1181
1182         # Open rule file and read in contents
1183         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1184
1185         # Store file content in an array.
1186         my @lines = <RULEFILE>;
1187
1188         # Close file.
1189         close(RULEFILE);
1190
1191         # Loop over rule file contents
1192         foreach my $line (@lines) {
1193                 # Remove whitespaces.
1194                 chomp $line;
1195
1196                 # Skip blank  lines.
1197                 next if ($line =~ /^\s*$/);
1198
1199                 # Local vars.
1200                 my $sid;
1201                 my $msg;
1202
1203                 # Gather rule sid and message from the ruleline.
1204                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1205                         $msg = $1;
1206                         $sid = $2;
1207
1208                         # Check if a rule has been found.
1209                         if ($sid && $msg) {
1210                                 # Add rule to the idsrules hash.
1211                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1212
1213                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1214                                 if ($line =~ /^\#/) {
1215                                         # If yes, the rule is disabled.
1216                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1217                                 } else {
1218                                         # Otherwise the rule is enabled.
1219                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1220                                 }
1221                         }
1222                 }
1223         }
1224 }
1225
1226 #
1227 ## Function to get the used memory of a given process-id.
1228 #
1229 sub get_memory_usage($) {
1230         my ($pid) = @_;
1231
1232         my $memory = 0;
1233
1234         # Try to open the status file for the given process-id on the pseudo
1235         # file system proc.
1236         if (open(FILE, "/proc/$pid/status")) {
1237                 # Loop through the entire file.
1238                 while (<FILE>) {
1239                         # Splitt current line content and store them into variables.
1240                         my ($key, $value) = split(":", $_, 2);
1241
1242                         # Check if the current key is the one which contains the memory usage.
1243                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1244                         # of the entire process.
1245                         if ($key eq "VmRSS") {
1246                                 # Found the memory usage add it to the memory variable.
1247                                 $memory += $value;
1248
1249                                 # Break the loop.
1250                                 last;
1251                         }
1252                 }
1253
1254                 # Close file handle.
1255                 close(FILE);
1256
1257                 # Return memory usage.
1258                 return $memory;
1259         }
1260
1261         # If the file could not be open, return nothing.
1262         return;
1263 }
1264
1265 #
1266 ## Function to generate the file which contains the home net information.
1267 #
1268 sub generate_home_net_file() {
1269         my %netsettings;
1270
1271         # Read-in network settings.
1272         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
1273
1274         # Get available network zones.
1275         my @network_zones = &IDS::get_available_network_zones();
1276
1277         # Temporary array to store network address and prefix of the configured
1278         # networks.
1279         my @networks;
1280
1281         # Loop through the array of available network zones.
1282         foreach my $zone (@network_zones) {
1283                 # Skip the red network - It never can be part to the home_net!
1284                 next if($zone eq "red");
1285
1286                 # Convert current zone name into upper case.
1287                 $zone = uc($zone);
1288
1289                 # Generate key to access the required data from the netsettings hash.
1290                 my $zone_netaddress = $zone . "_NETADDRESS";
1291                 my $zone_netmask = $zone . "_NETMASK";
1292
1293                 # Obtain the settings from the netsettings hash.
1294                 my $netaddress = $netsettings{$zone_netaddress};
1295                 my $netmask = $netsettings{$zone_netmask};
1296
1297                 # Convert the subnetmask into prefix notation.
1298                 my $prefix = &Network::convert_netmask2prefix($netmask);
1299
1300                 # Generate full network string.
1301                 my $network = join("/", $netaddress,$prefix);
1302
1303                 # Check if the network is valid.
1304                 if(&Network::check_subnet($network)) {
1305                         # Add the generated network to the array of networks.
1306                         push(@networks, $network);
1307                 }
1308         }
1309
1310         # Format home net declaration.
1311         my $line = "\"\[";
1312
1313         # Loop through the array of networks.
1314         foreach my $network (@networks) {
1315                 # Add the network to the line.
1316                 $line = "$line" . "$network";
1317
1318                 # Check if the current network was the last in the array.
1319                 if ($network eq $networks[-1]) {
1320                         # Close the line.
1321                         $line = "$line" . "\]\"";
1322                 } else {
1323                         # Add "," for the next network.
1324                         $line = "$line" . "\,";
1325                 }
1326         }
1327
1328         # Open file to store the addresses of the home net.
1329         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
1330
1331         # Print yaml header.
1332         print FILE "%YAML 1.1\n";
1333         print FILE "---\n\n";
1334
1335         # Print notice about autogenerated file.
1336         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
1337
1338         # Print the generated and required HOME_NET declaration to the file.
1339         print FILE "HOME_NET:\t$line\n";
1340
1341         # Close file handle.
1342         close(FILE);
1343
1344 }
1345
1346 #
1347 ## Function to generate the rules file with whitelisted addresses.
1348 #
1349 sub GenerateIgnoreFile() {
1350         my %ignored = ();
1351
1352         # SID range 1000000-1999999 Reserved for Local Use
1353         # Put your custom rules in this range to avoid conflicts
1354         my $sid = 1500000;
1355
1356         # Read-in ignoredfile.
1357         &General::readhasharray($ignoredfile, \%ignored);
1358
1359         # Open ignorefile for writing.
1360         open(FILE, ">$whitelistfile") or die "Could not write to $whitelistfile. $!\n";
1361
1362         # Config file header.
1363         print FILE "# Autogenerated file.\n";
1364         print FILE "# All user modifications will be overwritten.\n\n";
1365
1366         # Add all user defined addresses to the whitelist.
1367         #
1368         # Check if the hash contains any elements.
1369         if (keys (%ignored)) {
1370                 # Loop through the entire hash and write the host/network
1371                 # and remark to the ignore file.
1372                 while ( (my $key) = each %ignored) {
1373                         my $address = $ignored{$key}[0];
1374                         my $remark = $ignored{$key}[1];
1375                         my $status = $ignored{$key}[2];
1376
1377                         # Check if the status of the entry is "enabled".
1378                         if ($status eq "enabled") {
1379                                 # Check if the address/network is valid.
1380                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1381                                         # Write rule line to the file to pass any traffic from this IP
1382                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1383
1384                                         # Increment sid.
1385                                         $sid++;
1386                                 }
1387                         }
1388                 }
1389         }
1390
1391         close(FILE);
1392 }
1393
1394 #
1395 ## Function to read-in the given enabled or disables sids file.
1396 #
1397 sub read_enabled_disabled_sids_file($) {
1398         my ($file) = @_;
1399
1400         # Temporary hash to store the sids and their state. It will be
1401         # returned at the end of this function.
1402         my %temphash;
1403
1404         # Open the given filename.
1405         open(FILE, "$file") or die "Could not open $file. $!\n";
1406
1407         # Loop through the file.
1408         while(<FILE>) {
1409                 # Remove newlines.
1410                 chomp $_;
1411
1412                 # Skip blank lines.
1413                 next if ($_ =~ /^\s*$/);
1414
1415                 # Skip coments.
1416                 next if ($_ =~ /^\#/);
1417
1418                 # Splitt line into sid and state part.
1419                 my ($state, $sid) = split(" ", $_);
1420
1421                 # Skip line if the sid is not numeric.
1422                 next unless ($sid =~ /\d+/ );
1423
1424                 # Check if the sid was enabled.
1425                 if ($state eq "enablesid") {
1426                         # Add the sid and its state as enabled to the temporary hash.
1427                         $temphash{$sid} = "enabled";
1428                 # Check if the sid was disabled.
1429                 } elsif ($state eq "disablesid") {
1430                         # Add the sid and its state as disabled to the temporary hash.
1431                         $temphash{$sid} = "disabled";
1432                 # Invalid state - skip the current sid and state.
1433                 } else {
1434                         next;
1435                 }
1436         }
1437
1438         # Close filehandle.
1439         close(FILE);
1440
1441         # Return the hash.
1442         return %temphash;
1443 }
1444
1445 #
1446 ## Private function to convert a given rulefile to a category name.
1447 ## ( No file extension anymore and if the name contained a dot, it
1448 ## would be replaced by a underline sign.)
1449 #
1450 sub _rulefile_to_category($) {
1451         my ($filename) = @_;
1452
1453         # Splitt the filename into single chunks and store them in a
1454         # temorary array.
1455         my @parts = split(/\./, $filename);
1456
1457         # Return / Remove last element of the temporary array.
1458         # This removes the file extension.
1459         pop @parts;
1460
1461         # Join together the single elements of the temporary array.
1462         # If these are more than one, use a "underline" for joining.
1463         my $category = join '_', @parts;
1464
1465         # Return the converted filename.
1466         return $category;
1467 }