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 "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulesetsources = ();
  38 my %cgiparams=();
  39 my %checked=();
  40 my %selected=();
  41 my %ignored=();
  42
  43 # Read-in main settings, for language, theme and colors.
  44 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  45 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  46
  47 # Get the available network zones, based on the config type of the system and store
  48 # the list of zones in an array.
  49 my @network_zones = &IDS::get_available_network_zones();
  50
  51 # File where the used rulefiles are stored.
  52 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
  53
  54 # File where the addresses of the homenet are stored.
  55 my $idshomenetfile = "$IDS::settingsdir/suricata-homenet.yaml";
  56
  57 # File which contains the enabled sids.
  58 my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
  59
  60 # File which contains the disabled sids.
  61 my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
  62
  63 # File which contains wheater the rules should be changed.
  64 my $modify_sids_file = "$IDS::settingsdir/oinkmaster-modify-sids.conf";
  65
  66 # File which stores the configured settings for whitelisted addresses.
  67 my $ignoredfile = "$IDS::settingsdir/ignored";
  68
  69 # File which contains the rules to whitelist addresses on suricata.
  70 my $whitelistfile = "$IDS::rulespath/whitelist.rules";
  71
  72 my $errormessage;
  73
  74 # Create files if they does not exist yet.
  75 unless (-f "$enabled_sids_file") { &IDS::create_empty_file($enabled_sids_file); }
  76 unless (-f "$disabled_sids_file") { &IDS::create_empty_file($disabled_sids_file); }
  77 unless (-f "$modify_sids_file") { &IDS::create_empty_file($modify_sids_file); }
  78 unless (-f "$idsusedrulefilesfile") { &IDS::create_empty_file($idsusedrulefilesfile); }
  79 unless (-f "$ignoredfile") { &IDS::create_empty_file($ignoredfile); }
  80 unless (-f "$whitelistfile" ) { &IDS::create_empty_file($whitelistfile); }
  81
  82 &Header::showhttpheaders();
  83
  84 #Get GUI values
  85 &Header::getcgihash(\%cgiparams);
  86
  87 ## Add/edit an entry to the ignore file.
  88 #
  89 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  90
  91         # Check if any input has been performed.
  92         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  93
  94                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  95                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  96                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  97                 }
  98         } else {
  99                 $errormessage = "$Lang::tr{'guardian empty input'}";
 100         }
 101
 102         # Go further if there was no error.
 103         if ($errormessage eq '') {
 104                 my %ignored = ();
 105                 my $id;
 106                 my $status;
 107
 108                 # Assign hash values.
 109                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 110                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 111
 112                 # Read-in ignoredfile.
 113                 &General::readhasharray($ignoredfile, \%ignored);
 114
 115                 # Check if we should edit an existing entry and got an ID.
 116                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 117                         # Assin the provided id.
 118                         $id = $cgiparams{'ID'};
 119
 120                         # Undef the given ID.
 121                         undef($cgiparams{'ID'});
 122
 123                         # Grab the configured status of the corresponding entry.
 124                         $status = $ignored{$id}[2];
 125                 } else {
 126                         # Each newly added entry automatically should be enabled.
 127                         $status = "enabled";
 128
 129                         # Generate the ID for the new entry.
 130                         #
 131                         # Sort the keys by their ID and store them in an array.
 132                         my @keys = sort { $a <=> $b } keys %ignored;
 133
 134                         # Reverse the key array.
 135                         my @reversed = reverse(@keys);
 136
 137                         # Obtain the last used id.
 138                         my $last_id = @reversed[0];
 139
 140                         # Increase the last id by one and use it as id for the new entry.
 141                         $id = ++$last_id;
 142                 }
 143
 144                 # Add/Modify the entry to/in the ignored hash.
 145                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 146
 147                 # Write the changed ignored hash to the ignored file.
 148                 &General::writehasharray($ignoredfile, \%ignored);
 149
 150                 # Regenerate the ignore file.
 151                 &GenerateIgnoreFile();
 152         }
 153
 154         # Check if the IDS is running.
 155         if(&IDS::ids_is_running()) {
 156                 # Call suricatactrl to perform a reload.
 157                 &IDS::call_suricatactrl("reload");
 158         }
 159
 160 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 161 #
 162
 163 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 164         my %ignored = ();
 165
 166         # Only go further, if an ID has been passed.
 167         if ($cgiparams{'ID'}) {
 168                 # Assign the given ID.
 169                 my $id = $cgiparams{'ID'};
 170
 171                 # Undef the given ID.
 172                 undef($cgiparams{'ID'});
 173
 174                 # Read-in ignoredfile.
 175                 &General::readhasharray($ignoredfile, \%ignored);
 176
 177                 # Grab the configured status of the corresponding entry.
 178                 my $status = $ignored{$id}[2];
 179
 180                 # Switch the status.
 181                 if ($status eq "disabled") {
 182                         $status = "enabled";
 183                 } else {
 184                         $status = "disabled";
 185                 }
 186
 187                 # Modify the status of the existing entry.
 188                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 189
 190                 # Write the changed ignored hash to the ignored file.
 191                 &General::writehasharray($ignoredfile, \%ignored);
 192
 193                 # Regenerate the ignore file.
 194                 &GenerateIgnoreFile();
 195
 196                 # Check if the IDS is running.
 197                 if(&IDS::ids_is_running()) {
 198                         # Call suricatactrl to perform a reload.
 199                         &IDS::call_suricatactrl("reload");
 200                 }
 201         }
 202
 203 ## Remove entry from ignore list.
 204 #
 205 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 206         my %ignored = ();
 207
 208         # Read-in ignoredfile.
 209         &General::readhasharray($ignoredfile, \%ignored);
 210
 211         # Drop entry from the hash.
 212         delete($ignored{$cgiparams{'ID'}});
 213
 214         # Undef the given ID.
 215         undef($cgiparams{'ID'});
 216
 217         # Write the changed ignored hash to the ignored file.
 218         &General::writehasharray($ignoredfile, \%ignored);
 219
 220         # Regenerate the ignore file.
 221         &GenerateIgnoreFile();
 222
 223         # Check if the IDS is running.
 224         if(&IDS::ids_is_running()) {
 225                 # Call suricatactrl to perform a reload.
 226                 &IDS::call_suricatactrl("reload");
 227         }
 228 }
 229
 230 # Check if any error has been stored.
 231 if (-e $IDS::storederrorfile) {
 232         # Open file to read in the stored error message.
 233         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 234
 235         # Read the stored error message.
 236         $errormessage = <FILE>;
 237
 238         # Close file.
 239         close (FILE);
 240
 241         # Delete the file, which is now not longer required.
 242         unlink($IDS::storederrorfile);
 243 }
 244
 245
 246 ## Grab all available snort rules and store them in the idsrules hash.
 247 #
 248 # Open snort rules directory and do a directory listing.
 249 opendir(DIR, $IDS::rulespath) or die $!;
 250         # Loop through the direcory.
 251         while (my $file = readdir(DIR)) {
 252
 253                 # We only want files.
 254                 next unless (-f "$IDS::rulespath/$file");
 255
 256                 # Ignore empty files.
 257                 next if (-z "$IDS::rulespath/$file");
 258
 259                 # Use a regular expression to find files ending in .rules
 260                 next unless ($file =~ m/\.rules$/);
 261
 262                 # Ignore files which are not read-able.
 263                 next unless (-R "$IDS::rulespath/$file");
 264
 265                 # Skip whitelist rules file.
 266                 next if( $file eq "whitelist.rules");
 267
 268                 # Call subfunction to read-in rulefile and add rules to
 269                 # the idsrules hash.
 270                 &readrulesfile("$file");
 271         }
 272
 273 closedir(DIR);
 274
 275 # Gather used rulefiles.
 276 #
 277 # Check if the file for activated rulefiles is not empty.
 278 if(-f $idsusedrulefilesfile) {
 279         # Open the file for used rulefile and read-in content.
 280         open(FILE, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\n";
 281
 282         # Read-in content.
 283         my @lines = <FILE>;
 284
 285         # Close file.
 286         close(FILE);
 287
 288         # Loop through the array.
 289         foreach my $line (@lines) {
 290                 # Remove newlines.
 291                 chomp($line);
 292
 293                 # Skip comments.
 294                 next if ($line =~ /\#/);
 295
 296                 # Skip blank  lines.
 297                 next if ($line =~ /^\s*$/);
 298
 299                 # Gather rule sid and message from the ruleline.
 300                 if ($line =~ /.*- (.*)/) {
 301                         my $rulefile = $1;
 302
 303                         # Add the rulefile to the %idsrules hash.
 304                         $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 305                 }
 306         }
 307 }
 308
 309 # Save ruleset.
 310 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 311         # Arrays to store which rulefiles have been enabled and will be used.
 312         my @enabled_rulefiles;
 313
 314         # Hash to store the user-enabled and disabled sids.
 315         my %enabled_disabled_sids;
 316
 317         # Loop through the hash of idsrules.
 318         foreach my $rulefile(keys %idsrules) {
 319                 # Check if the rulefile is enabled.
 320                 if ($cgiparams{$rulefile} eq "on") {
 321                         # Add rulefile to the array of enabled rulefiles.
 322                         push(@enabled_rulefiles, $rulefile);
 323
 324                         # Drop item from cgiparams hash.
 325                         delete $cgiparams{$rulefile};
 326                 }
 327         }
 328
 329         # Read-in the files for enabled/disabled sids.
 330         # This will be done by calling the read_enabled_disabled_sids_file function two times
 331         # and merge the returned hashes together into the enabled_disabled_sids hash.
 332         %enabled_disabled_sids = (
 333                 &read_enabled_disabled_sids_file($disabled_sids_file),
 334                 &read_enabled_disabled_sids_file($enabled_sids_file));
 335
 336         # Loop through the hash of idsrules.
 337         foreach my $rulefile (keys %idsrules) {
 338                 # Loop through the single rules of the rulefile.
 339                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 340                         # Skip the current sid if it is not numeric.
 341                         next unless ($sid =~ /\d+/ );
 342
 343                         # Check if there exists a key in the cgiparams hash for this sid.
 344                         if (exists($cgiparams{$sid})) {
 345                                 # Look if the rule is disabled.
 346                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 347                                         # Check if the state has been set to 'on'.
 348                                         if ($cgiparams{$sid} eq "on") {
 349                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 350                                                 $enabled_disabled_sids{$sid} = "enabled";
 351
 352                                                 # Drop item from cgiparams hash.
 353                                                 delete $cgiparams{$rulefile}{$sid};
 354                                         }
 355                                 }
 356                         } else {
 357                                 # Look if the rule is enabled.
 358                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 359                                         # Check if the state is 'on' and should be disabled.
 360                                         # In this case there is no entry
 361                                         # for the sid in the cgiparams hash.
 362                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 363                                         $enabled_disabled_sids{$sid} = "disabled";
 364
 365                                         # Drop item from cgiparams hash.
 366                                         delete $cgiparams{$rulefile}{$sid};
 367                                 }
 368                         }
 369                 }
 370         }
 371
 372         # Open enabled sid's file for writing.
 373         open(ENABLED_FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 374
 375         # Open disabled sid's file for writing.
 376         open(DISABLED_FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 377
 378         # Write header to the files.
 379         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 380         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 381
 382         # Check if the hash for enabled/disabled files contains any entries.
 383         if (%enabled_disabled_sids) {
 384                 # Loop through the hash.
 385                 foreach my $sid (keys %enabled_disabled_sids) {
 386                         # Check if the sid is enabled.
 387                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 388                                 # Print the sid to the enabled_sids file.
 389                                 print ENABLED_FILE "enablesid $sid\n";
 390                         # Check if the sid is disabled.
 391                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 392                                 # Print the sid to the disabled_sids file.
 393                                 print DISABLED_FILE "disablesid $sid\n";
 394                         # Something strange happende - skip the current sid.
 395                         } else {
 396                                 next;
 397                         }
 398                 }
 399         }
 400
 401         # Close file for enabled_sids after writing.
 402         close(ENABLED_FILE);
 403
 404         # Close file for disabled_sids after writing.
 405         close(DISABLED_FILE);
 406
 407         # Open file for used rulefiles.
 408         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 409
 410         # Write yaml header to the file.
 411         print FILE "%YAML 1.1\n";
 412         print FILE "---\n\n";
 413
 414         # Write header to file.
 415         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 416
 417         # Check if the enabled_rulefiles array contains any entries.
 418         if (@enabled_rulefiles) {
 419                 # Allways load the whitelist.
 420                 print FILE " - whitelist.rules\n";
 421
 422                 # Loop through the array of rulefiles which should be loaded and write them to the file.
 423                 foreach my $file (@enabled_rulefiles) {
 424                         print FILE " - $file\n";
 425                 }
 426         }
 427
 428         # Close file after writing.
 429         close(FILE);
 430
 431         # Lock the webpage and print message.
 432         &working_notice("$Lang::tr{'snort working'}");
 433
 434         # Call oinkmaster to alter the ruleset.
 435         &IDS::oinkmaster();
 436
 437         # Check if the IDS is running.
 438         if(&IDS::ids_is_running()) {
 439                 # Call suricatactrl to perform a reload.
 440                 &IDS::call_suricatactrl("reload");
 441         }
 442
 443         # Reload page.
 444         &reload();
 445
 446 # Download new ruleset.
 447 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 448         # Check if the red device is active.
 449         unless (-e "${General::swroot}/red/active") {
 450                 $errormessage = $Lang::tr{'could not download latest updates'};
 451         }
 452
 453         # Check if enought free disk space is availabe.
 454         if(&IDS::checkdiskspace()) {
 455                 $errormessage = "$Lang::tr{'not enough disk space'}";
 456         }
 457
 458         # Check if any errors happend.
 459         unless ($errormessage) {
 460                 # Lock the webpage and print notice about downloading
 461                 # a new ruleset.
 462                 &working_notice("$Lang::tr{'snort working'}");
 463
 464                 # Call subfunction to download the ruleset.
 465                 if(&IDS::downloadruleset()) {
 466                         $errormessage = $Lang::tr{'could not download latest updates'};
 467
 468                         # Call function to store the errormessage.
 469                         &IDS::_store_error_message($errormessage);
 470
 471                         # Preform a reload of the page.
 472                         &reload();
 473                 } else {
 474                         # Call subfunction to launch oinkmaster.
 475                         &IDS::oinkmaster();
 476
 477                         # Check if the IDS is running.
 478                         if(&IDS::ids_is_running()) {
 479                                 # Call suricatactrl to perform a reload.
 480                                 &IDS::call_suricatactrl("reload");
 481                         }
 482
 483                         # Perform a reload of the page.
 484                         &reload();
 485                 }
 486         }
 487 # Save snort settings.
 488 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 489         my %oldidssettings;
 490         my $reload_page;
 491
 492         # Read-in current (old) IDS settings.
 493         &General::readhash("$IDS::settingsdir/settings", \%oldidssettings);
 494
 495         # Prevent form name from been stored in conf file.
 496         delete $cgiparams{'IDS'};
 497
 498         # Check if an oinkcode has been provided.
 499         if ($cgiparams{'OINKCODE'}) {
 500                 # Check if the oinkcode contains unallowed chars.
 501                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 502                         $errormessage = $Lang::tr{'invalid input for oink code'};
 503                 }
 504         }
 505
 506         # Go on if there are no error messages.
 507         if (!$errormessage) {
 508                 # Store settings into settings file.
 509                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 510         }
 511
 512         # Generate file to store the home net.
 513         &generate_home_net_file();
 514
 515         # Open modify sid's file for writing.
 516         open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
 517
 518         # Write file header.
 519         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 520
 521         # Check if the configured runmode is IPS.
 522         if ($cgiparams{'RUN_MODE'} eq 'IPS') {
 523                 # Tell oinkmaster to switch all rules from alert to drop.
 524                 print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 525         }
 526
 527         # Close file handle.
 528         close(FILE);
 529
 530         # Check if the runmode has been changed.
 531         if($cgiparams{'RUN_MODE'} ne $oldidssettings{'RUN_MODE'}) {
 532                 # Check if a ruleset exists.
 533                 if (%idsrules) {
 534                         # Lock the webpage and print message.
 535                         &working_notice("$Lang::tr{'snort working'}");
 536
 537                         # Call oinkmaster to alter the ruleset.
 538                         &IDS::oinkmaster();
 539
 540                         # Set reload_page to "True".
 541                         $reload_page="True";
 542                 }
 543         }
 544
 545         # Check if the IDS currently is running.
 546         if(&IDS::ids_is_running()) {
 547                 # Check if ENABLE_IDS is set to on.
 548                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 549                         # Call suricatactrl to perform a reload of suricata.
 550                         &IDS::call_suricatactrl("reload");
 551                 } else {
 552                         # Call suricatactrl to stop suricata.
 553                         &IDS::call_suricatactrl("stop");
 554                 }
 555         } else {
 556                 # Call suricatactrl to start suricata.
 557                 &IDS::call_suricatactrl("start");
 558         }
 559
 560         # Check if the page should be reloaded.
 561         if ($reload_page) {
 562                 # Perform a reload of the page.
 563                 &reload();
 564         }
 565 }
 566
 567 # Read-in idssettings
 568 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 569
 570 # If the runmode has not been configured yet, set default value.
 571 unless(exists($idssettings{'RUN_MODE'})) {
 572         # Set default to IPS.
 573         $idssettings{'RUN_MODE'} = 'IPS';
 574 }
 575
 576 # Read-in ignored hosts.
 577 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 578
 579 $checked{'ENABLE_IDS'}{'off'} = '';
 580 $checked{'ENABLE_IDS'}{'on'} = '';
 581 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 582 $checked{'RUN_MODE'}{'IDS'} = '';
 583 $checked{'RUN_MODE'}{'IPS'} = '';
 584 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
 585 $selected{'RULES'}{'nothing'} = '';
 586 $selected{'RULES'}{'community'} = '';
 587 $selected{'RULES'}{'emerging'} = '';
 588 $selected{'RULES'}{'registered'} = '';
 589 $selected{'RULES'}{'subscripted'} = '';
 590 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 591
 592 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 593
 594 ### Java Script ###
 595 print <<END
 596 <script>
 597         // Tiny java script function to show/hide the rules
 598         // of a given category.
 599         function showhide(tblname) {
 600                 \$("#" + tblname).toggle();
 601         }
 602 </script>
 603 END
 604 ;
 605
 606 &Header::openbigbox('100%', 'left', '', $errormessage);
 607
 608 if ($errormessage) {
 609         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 610         print "<class name='base'>$errormessage\n";
 611         print "&nbsp;</class>\n";
 612         &Header::closebox();
 613 }
 614
 615 # Draw current state of the IDS
 616 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 617
 618 # Check if the IDS is running and obtain the process-id.
 619 my $pid = &IDS::ids_is_running();
 620
 621 # Display some useful information, if suricata daemon is running.
 622 if ($pid) {
 623         # Gather used memory.
 624         my $memory = &get_memory_usage($pid);
 625
 626         print <<END;
 627                 <table width='95%' cellspacing='0' class='tbl'>
 628                         <tr>
 629                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 630                         </tr>
 631
 632                         <tr>
 633                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 634                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 635                         </tr>
 636
 637                         <tr>
 638                                 <td class='base'></td>
 639                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 640                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 641                         </tr>
 642
 643                         <tr>
 644                                 <td class='base'></td>
 645                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 646                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 647                         </tr>
 648                 </table>
 649 END
 650 } else {
 651         # Otherwise display a hint that the service is not launched.
 652         print <<END;
 653                 <table width='95%' cellspacing='0' class='tbl'>
 654                         <tr>
 655                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 656                         </tr>
 657
 658                         <tr>
 659                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 660                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 661                         </tr>
 662                 </table>
 663 END
 664 }
 665 &Header::closebox();
 666
 667 # Draw elements for IDS configuration.
 668 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 669
 670 my $rulesdate;
 671
 672 # Check if a ruleset allready has been downloaded.
 673 if ( -f "$IDS::rulestarball"){
 674         # Call stat on the filename to obtain detailed information.
 675         my @Info = stat("$IDS::rulestarball");
 676
 677         # Grab details about the creation time.
 678         $rulesdate = localtime($Info[9]);
 679 }
 680
 681 print <<END
 682 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 683         <table width='100%' border='0'>
 684                 <tr>
 685                         <td class='base' colspan='4'>
 686                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 687                         </td>
 688                 </tr>
 689
 690                 <tr>
 691                         <td colspan='4'><br><br></td>
 692                 </tr>
 693
 694                 <tr>
 695                         <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
 696                 </tr>
 697
 698                 <tr>
 699                         <td class='base' colspan='4'>
 700                                 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'} &nbsp&nbsp&nbsp
 701                                 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
 702                         </td>
 703                 </tr>
 704
 705                 <tr>
 706                         <td colspan='4'><br></td>
 707                 </tr>
 708
 709                 <tr>
 710                         <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
 711                 </tr>
 712
 713                 <tr>
 714 END
 715 ;
 716
 717 # Loop through the array of available networks and print config options.
 718 foreach my $zone (@network_zones) {
 719         my $checked_input;
 720         my $checked_forward;
 721
 722         # Convert current zone name to upper case.
 723         my $zone_upper = uc($zone);
 724
 725         # Grab checkbox status from settings hash.
 726         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 727                 $checked_input = "checked = 'checked'";
 728         }
 729
 730         print "<td class='base' width='25%'>\n";
 731         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
 732         print "</td>\n";
 733 }
 734
 735 print <<END
 736                 </tr>
 737
 738                 <tr>
 739                         <td colspan='4'><br><br></td>
 740                 </tr>
 741
 742                 <tr>
 743                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 744                 </tr>
 745
 746                 <tr>
 747                         <td colspan='4'><select name='RULES'>
 748                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 749                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 750                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 751                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 752                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 753                         </select>
 754                         </td>
 755                 </tr>
 756
 757                 <tr>
 758                         <td colspan='4'>
 759                                 <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>
 760                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 761                         </td>
 762                 </tr>
 763
 764                 <tr>
 765                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 766                 </tr>
 767
 768                 <tr>
 769                         <td colspan='4' align='left'><br>
 770                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 771                         </td>
 772
 773                 </tr>
 774         </table>
 775
 776         <br><br>
 777
 778         <table width='100%'>
 779                 <tr>
 780                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 781                 </tr>
 782         </table>
 783 </form>
 784 END
 785 ;
 786
 787 &Header::closebox();
 788
 789 #
 790 # Whitelist / Ignorelist
 791 #
 792 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 793
 794 print <<END;
 795         <table width='100%'>
 796                 <tr>
 797                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 798                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 799                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 800                 </tr>
 801 END
 802                 # Check if some hosts have been added to be ignored.
 803                 if (keys (%ignored)) {
 804                         my $col = "";
 805
 806                         # Loop through all entries of the hash.
 807                         while( (my $key) = each %ignored)  {
 808                                 # Assign data array positions to some nice variable names.
 809                                 my $address = $ignored{$key}[0];
 810                                 my $remark = $ignored{$key}[1];
 811                                 my $status  = $ignored{$key}[2];
 812
 813                                 # Check if the key (id) number is even or not.
 814                                 if ($cgiparams{'ID'} eq $key) {
 815                                         $col="bgcolor='${Header::colouryellow}'";
 816                                 } elsif ($key % 2) {
 817                                         $col="bgcolor='$color{'color22'}'";
 818                                 } else {
 819                                         $col="bgcolor='$color{'color20'}'";
 820                                 }
 821
 822                                 # Choose icon for the checkbox.
 823                                 my $gif;
 824                                 my $gdesc;
 825
 826                                 # Check if the status is enabled and select the correct image and description.
 827                                 if ($status eq 'enabled' ) {
 828                                         $gif = 'on.gif';
 829                                         $gdesc = $Lang::tr{'click to disable'};
 830                                 } else {
 831                                         $gif = 'off.gif';
 832                                         $gdesc = $Lang::tr{'click to enable'};
 833                                 }
 834
 835 print <<END;
 836                                 <tr>
 837                                         <td width='20%' class='base' $col>$address</td>
 838                                         <td width='65%' class='base' $col>$remark</td>
 839
 840                                         <td align='center' $col>
 841                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 842                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 843                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 844                                                         <input type='hidden' name='ID' value='$key' />
 845                                                 </form>
 846                                         </td>
 847
 848                                         <td align='center' $col>
 849                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 850                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 851                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 852                                                         <input type='hidden' name='ID' value='$key' />
 853                                                 </form>
 854                                         </td>
 855
 856                                         <td align='center' $col>
 857                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 858                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 859                                                         <input type='hidden' name='ID' value='$key'>
 860                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 861                                                 </form>
 862                                         </td>
 863                                 </tr>
 864 END
 865                         }
 866                 } else {
 867                         # Print notice that currently no hosts are ignored.
 868                         print "<tr>\n";
 869                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 870                         print "</tr>\n";
 871                 }
 872
 873         print "</table>\n";
 874
 875         # Section to add new elements or edit existing ones.
 876 print <<END;
 877         <br>
 878         <hr>
 879         <br>
 880
 881         <div align='center'>
 882                 <table width='100%'>
 883 END
 884
 885         # Assign correct headline and button text.
 886         my $buttontext;
 887         my $entry_address;
 888         my $entry_remark;
 889
 890         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 891         if ($cgiparams{'ID'} ne '') {
 892                 $buttontext = $Lang::tr{'update'};
 893                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 894
 895                         # Grab address and remark for the given key.
 896                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
 897                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
 898                 } else {
 899                         $buttontext = $Lang::tr{'add'};
 900                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
 901                 }
 902
 903 print <<END;
 904                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 905                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
 906                         <tr>
 907                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
 908                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
 909
 910                                 <td width='30%'>$Lang::tr{'remark'}: </td>
 911                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
 912                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
 913                         </tr>
 914                         </form>
 915                 </table>
 916         </div>
 917 END
 918
 919 &Header::closebox();
 920
 921 # Only show the section for configuring the ruleset if one is present.
 922 if (%idsrules) {
 923         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 924
 925                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 926
 927                 # Output display table for rule files
 928                 print "<table width='100%'>\n";
 929
 930                 # Local variable required for java script to show/hide
 931                 # rules of a rulefile.
 932                 my $rulesetcount = 1;
 933
 934                 # Loop over each rule file
 935                 foreach my $rulefile (sort keys(%idsrules)) {
 936                         my $rulechecked = '';
 937
 938                         # Check if rule file is enabled
 939                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 940                                 $rulechecked = 'CHECKED';
 941                         }
 942
 943                         # Table and rows for the rule files.
 944                         print"<tr>\n";
 945                         print"<td class='base' width='5%'>\n";
 946                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 947                         print"</td>\n";
 948                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 949                         print"<td class='base' width='5%' align='right'>\n";
 950                         print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 951                         print"</td>\n";
 952                         print"</tr>\n";
 953
 954                         # Rows which will be hidden per default and will contain the single rules.
 955                         print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 956                         print"<td colspan='3'>\n";
 957
 958                         # Local vars
 959                         my $lines;
 960                         my $rows;
 961                         my $col;
 962
 963                         # New table for the single rules.
 964                         print "<table width='100%'>\n";
 965
 966                         # Loop over rule file rules
 967                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 968                                 # Local vars
 969                                 my $ruledefchecked = '';
 970
 971                                 # Skip rulefile itself.
 972                                 next if ($sid eq "Rulefile");
 973
 974                                 # If 2 rules have been displayed, start a new row
 975                                 if (($lines % 2) == 0) {
 976                                         print "</tr><tr>\n";
 977
 978                                         # Increase rows by once.
 979                                         $rows++;
 980                                 }
 981
 982                                 # Colour lines.
 983                                 if ($rows % 2) {
 984                                         $col="bgcolor='$color{'color20'}'";
 985                                 } else {
 986                                         $col="bgcolor='$color{'color22'}'";
 987                                 }
 988
 989                                 # Set rule state
 990                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 991                                         $ruledefchecked = 'CHECKED';
 992                                 }
 993
 994                                 # Create rule checkbox and display rule description
 995                                 print "<td class='base' width='5%' align='right' $col>\n";
 996                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 997                                 print "</td>\n";
 998                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
 999
1000                                 # Increment rule count
1001                                 $lines++;
1002                         }
1003
1004                         # If do not have a second rule for row, create empty cell
1005                         if (($lines % 2) != 0) {
1006                                 print "<td class='base'></td>";
1007                         }
1008
1009                         # Close display table
1010                         print "</tr></table></td></tr>";
1011
1012                         # Finished whith the rule file, increase count.
1013                         $rulesetcount++;
1014                 }
1015
1016                 # Close display table
1017                 print "</table>";
1018
1019 print <<END
1020 <table width='100%'>
1021 <tr>
1022         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1023                 &nbsp; <!-- space for future online help link -->
1024         </td>
1025 </tr>
1026 </table>
1027 </form>
1028 END
1029 ;
1030         &Header::closebox();
1031 }
1032
1033 &Header::closebigbox();
1034 &Header::closepage();
1035
1036 #
1037 ## A function to display a notice, to lock the webpage and
1038 ## tell the user which action currently will be performed.
1039 #
1040 sub working_notice ($) {
1041         my ($message) = @_;
1042
1043         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1044         &Header::openbigbox('100%', 'left', '', $errormessage);
1045         &Header::openbox( 'Waiting', 1,);
1046                 print <<END;
1047                         <table>
1048                                 <tr>
1049                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1050                                         <td>$message</td>
1051                                 </tr>
1052                         </table>
1053 END
1054         &Header::closebox();
1055         &Header::closebigbox();
1056         &Header::closepage();
1057 }
1058
1059 #
1060 ## A tiny function to perform a reload of the webpage after one second.
1061 #
1062 sub reload () {
1063         print "<meta http-equiv='refresh' content='1'>\n";
1064
1065         # Stop the script.
1066         exit;
1067 }
1068
1069 #
1070 ## Private function to read-in and parse rules of a given rulefile.
1071 #
1072 ## The given file will be read, parsed and all valid rules will be stored by ID,
1073 ## message/description and it's state in the idsrules hash.
1074 #
1075 sub readrulesfile ($) {
1076         my $rulefile = shift;
1077
1078         # Open rule file and read in contents
1079         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1080
1081         # Store file content in an array.
1082         my @lines = <RULEFILE>;
1083
1084         # Close file.
1085         close(RULEFILE);
1086
1087         # Loop over rule file contents
1088         foreach my $line (@lines) {
1089                 # Remove whitespaces.
1090                 chomp $line;
1091
1092                 # Skip blank  lines.
1093                 next if ($line =~ /^\s*$/);
1094
1095                 # Local vars.
1096                 my $sid;
1097                 my $msg;
1098
1099                 # Gather rule sid and message from the ruleline.
1100                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1101                         $msg = $1;
1102                         $sid = $2;
1103
1104                         # Check if a rule has been found.
1105                         if ($sid && $msg) {
1106                                 # Add rule to the idsrules hash.
1107                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1108
1109                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1110                                 if ($line =~ /^\#/) {
1111                                         # If yes, the rule is disabled.
1112                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1113                                 } else {
1114                                         # Otherwise the rule is enabled.
1115                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1116                                 }
1117                         }
1118                 }
1119         }
1120 }
1121
1122 #
1123 ## Function to get the used memory of a given process-id.
1124 #
1125 sub get_memory_usage($) {
1126         my ($pid) = @_;
1127
1128         my $memory = 0;
1129
1130         # Try to open the status file for the given process-id on the pseudo
1131         # file system proc.
1132         if (open(FILE, "/proc/$pid/status")) {
1133                 # Loop through the entire file.
1134                 while (<FILE>) {
1135                         # Splitt current line content and store them into variables.
1136                         my ($key, $value) = split(":", $_, 2);
1137
1138                         # Check if the current key is the one which contains the memory usage.
1139                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1140                         # of the entire process.
1141                         if ($key eq "VmRSS") {
1142                                 # Found the memory usage add it to the memory variable.
1143                                 $memory += $value;
1144
1145                                 # Break the loop.
1146                                 last;
1147                         }
1148                 }
1149
1150                 # Close file handle.
1151                 close(FILE);
1152
1153                 # Return memory usage.
1154                 return $memory;
1155         }
1156
1157         # If the file could not be open, return nothing.
1158         return;
1159 }
1160
1161 #
1162 ## Function to generate the file which contains the home net information.
1163 #
1164 sub generate_home_net_file() {
1165         my %netsettings;
1166
1167         # Read-in network settings.
1168         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
1169
1170         # Get available network zones.
1171         my @network_zones = &IDS::get_available_network_zones();
1172
1173         # Temporary array to store network address and prefix of the configured
1174         # networks.
1175         my @networks;
1176
1177         # Loop through the array of available network zones.
1178         foreach my $zone (@network_zones) {
1179                 # Skip the red network - It never can be part to the home_net!
1180                 next if($zone eq "red");
1181
1182                 # Convert current zone name into upper case.
1183                 $zone = uc($zone);
1184
1185                 # Generate key to access the required data from the netsettings hash.
1186                 my $zone_netaddress = $zone . "_NETADDRESS";
1187                 my $zone_netmask = $zone . "_NETMASK";
1188
1189                 # Obtain the settings from the netsettings hash.
1190                 my $netaddress = $netsettings{$zone_netaddress};
1191                 my $netmask = $netsettings{$zone_netmask};
1192
1193                 # Convert the subnetmask into prefix notation.
1194                 my $prefix = &Network::convert_netmask2prefix($netmask);
1195
1196                 # Generate full network string.
1197                 my $network = join("/", $netaddress,$prefix);
1198
1199                 # Check if the network is valid.
1200                 if(&Network::check_subnet($network)) {
1201                         # Add the generated network to the array of networks.
1202                         push(@networks, $network);
1203                 }
1204         }
1205
1206         # Format home net declaration.
1207         my $line = "\"\[";
1208
1209         # Loop through the array of networks.
1210         foreach my $network (@networks) {
1211                 # Add the network to the line.
1212                 $line = "$line" . "$network";
1213
1214                 # Check if the current network was the last in the array.
1215                 if ($network eq $networks[-1]) {
1216                         # Close the line.
1217                         $line = "$line" . "\]\"";
1218                 } else {
1219                         # Add "," for the next network.
1220                         $line = "$line" . "\,";
1221                 }
1222         }
1223
1224         # Open file to store the addresses of the home net.
1225         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
1226
1227         # Print yaml header.
1228         print FILE "%YAML 1.1\n";
1229         print FILE "---\n\n";
1230
1231         # Print notice about autogenerated file.
1232         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
1233
1234         # Print the generated and required HOME_NET declaration to the file.
1235         print FILE "HOME_NET:\t$line\n";
1236
1237         # Close file handle.
1238         close(FILE);
1239
1240 }
1241
1242 #
1243 ## Function to generate the rules file with whitelisted addresses.
1244 #
1245 sub GenerateIgnoreFile() {
1246         my %ignored = ();
1247
1248         # SID range 1000000-1999999 Reserved for Local Use
1249         # Put your custom rules in this range to avoid conflicts
1250         my $sid = 1500000;
1251
1252         # Read-in ignoredfile.
1253         &General::readhasharray($ignoredfile, \%ignored);
1254
1255         # Open ignorefile for writing.
1256         open(FILE, ">$whitelistfile") or die "Could not write to $whitelistfile. $!\n";
1257
1258         # Config file header.
1259         print FILE "# Autogenerated file.\n";
1260         print FILE "# All user modifications will be overwritten.\n\n";
1261
1262         # Add all user defined addresses to the whitelist.
1263         #
1264         # Check if the hash contains any elements.
1265         if (keys (%ignored)) {
1266                 # Loop through the entire hash and write the host/network
1267                 # and remark to the ignore file.
1268                 while ( (my $key) = each %ignored) {
1269                         my $address = $ignored{$key}[0];
1270                         my $remark = $ignored{$key}[1];
1271                         my $status = $ignored{$key}[2];
1272
1273                         # Check if the status of the entry is "enabled".
1274                         if ($status eq "enabled") {
1275                                 # Check if the address/network is valid.
1276                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1277                                         # Write rule line to the file to pass any traffic from this IP
1278                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1279
1280                                         # Increment sid.
1281                                         $sid++;
1282                                 }
1283                         }
1284                 }
1285         }
1286
1287         close(FILE);
1288 }
1289
1290 #
1291 ## Function to read-in the given enabled or disables sids file.
1292 #
1293 sub read_enabled_disabled_sids_file($) {
1294         my ($file) = @_;
1295
1296         # Temporary hash to store the sids and their state. It will be
1297         # returned at the end of this function.
1298         my %temphash;
1299
1300         # Open the given filename.
1301         open(FILE, "$file") or die "Could not open $file. $!\n";
1302
1303         # Loop through the file.
1304         while(<FILE>) {
1305                 # Remove newlines.
1306                 chomp $_;
1307
1308                 # Skip blank lines.
1309                 next if ($_ =~ /^\s*$/);
1310
1311                 # Skip coments.
1312                 next if ($_ =~ /^\#/);
1313
1314                 # Splitt line into sid and state part.
1315                 my ($state, $sid) = split(" ", $_);
1316
1317                 # Skip line if the sid is not numeric.
1318                 next unless ($sid =~ /\d+/ );
1319
1320                 # Check if the sid was enabled.
1321                 if ($state eq "enablesid") {
1322                         # Add the sid and its state as enabled to the temporary hash.
1323                         $temphash{$sid} = "enabled";
1324                 # Check if the sid was disabled.
1325                 } elsif ($state eq "disablesid") {
1326                         # Add the sid and its state as disabled to the temporary hash.
1327                         $temphash{$sid} = "disabled";
1328                 # Invalid state - skip the current sid and state.
1329                 } else {
1330                         next;
1331                 }
1332         }
1333
1334         # Close filehandle.
1335         close(FILE);
1336
1337         # Return the hash.
1338         return %temphash;
1339 }