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 = $1;
 302
 303                         # Check if the current rulefile exists in the %idsrules hash.
 304                         # If not, the file probably does not exist anymore or contains
 305                         # no rules.
 306                         if($idsrules{$rulefile}) {
 307                                 # Add the rulefile state to the %idsrules hash.
 308                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 309                         }
 310                 }
 311         }
 312 }
 313
 314 # Save ruleset.
 315 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 316         # Arrays to store which rulefiles have been enabled and will be used.
 317         my @enabled_rulefiles;
 318
 319         # Hash to store the user-enabled and disabled sids.
 320         my %enabled_disabled_sids;
 321
 322         # Loop through the hash of idsrules.
 323         foreach my $rulefile(keys %idsrules) {
 324                 # Check if the rulefile is enabled.
 325                 if ($cgiparams{$rulefile} eq "on") {
 326                         # Add rulefile to the array of enabled rulefiles.
 327                         push(@enabled_rulefiles, $rulefile);
 328
 329                         # Drop item from cgiparams hash.
 330                         delete $cgiparams{$rulefile};
 331                 }
 332         }
 333
 334         # Read-in the files for enabled/disabled sids.
 335         # This will be done by calling the read_enabled_disabled_sids_file function two times
 336         # and merge the returned hashes together into the enabled_disabled_sids hash.
 337         %enabled_disabled_sids = (
 338                 &read_enabled_disabled_sids_file($disabled_sids_file),
 339                 &read_enabled_disabled_sids_file($enabled_sids_file));
 340
 341         # Loop through the hash of idsrules.
 342         foreach my $rulefile (keys %idsrules) {
 343                 # Loop through the single rules of the rulefile.
 344                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 345                         # Skip the current sid if it is not numeric.
 346                         next unless ($sid =~ /\d+/ );
 347
 348                         # Check if there exists a key in the cgiparams hash for this sid.
 349                         if (exists($cgiparams{$sid})) {
 350                                 # Look if the rule is disabled.
 351                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 352                                         # Check if the state has been set to 'on'.
 353                                         if ($cgiparams{$sid} eq "on") {
 354                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 355                                                 $enabled_disabled_sids{$sid} = "enabled";
 356
 357                                                 # Drop item from cgiparams hash.
 358                                                 delete $cgiparams{$rulefile}{$sid};
 359                                         }
 360                                 }
 361                         } else {
 362                                 # Look if the rule is enabled.
 363                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 364                                         # Check if the state is 'on' and should be disabled.
 365                                         # In this case there is no entry
 366                                         # for the sid in the cgiparams hash.
 367                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 368                                         $enabled_disabled_sids{$sid} = "disabled";
 369
 370                                         # Drop item from cgiparams hash.
 371                                         delete $cgiparams{$rulefile}{$sid};
 372                                 }
 373                         }
 374                 }
 375         }
 376
 377         # Open enabled sid's file for writing.
 378         open(ENABLED_FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 379
 380         # Open disabled sid's file for writing.
 381         open(DISABLED_FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 382
 383         # Write header to the files.
 384         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 385         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 386
 387         # Check if the hash for enabled/disabled files contains any entries.
 388         if (%enabled_disabled_sids) {
 389                 # Loop through the hash.
 390                 foreach my $sid (keys %enabled_disabled_sids) {
 391                         # Check if the sid is enabled.
 392                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 393                                 # Print the sid to the enabled_sids file.
 394                                 print ENABLED_FILE "enablesid $sid\n";
 395                         # Check if the sid is disabled.
 396                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 397                                 # Print the sid to the disabled_sids file.
 398                                 print DISABLED_FILE "disablesid $sid\n";
 399                         # Something strange happende - skip the current sid.
 400                         } else {
 401                                 next;
 402                         }
 403                 }
 404         }
 405
 406         # Close file for enabled_sids after writing.
 407         close(ENABLED_FILE);
 408
 409         # Close file for disabled_sids after writing.
 410         close(DISABLED_FILE);
 411
 412         # Open file for used rulefiles.
 413         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 414
 415         # Write yaml header to the file.
 416         print FILE "%YAML 1.1\n";
 417         print FILE "---\n\n";
 418
 419         # Write header to file.
 420         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 421
 422         # Check if the enabled_rulefiles array contains any entries.
 423         if (@enabled_rulefiles) {
 424                 # Allways load the whitelist.
 425                 print FILE " - whitelist.rules\n";
 426
 427                 # Loop through the array of rulefiles which should be loaded and write them to the file.
 428                 foreach my $file (@enabled_rulefiles) {
 429                         print FILE " - $file\n";
 430                 }
 431         }
 432
 433         # Close file after writing.
 434         close(FILE);
 435
 436         # Lock the webpage and print message.
 437         &working_notice("$Lang::tr{'snort working'}");
 438
 439         # Call oinkmaster to alter the ruleset.
 440         &IDS::oinkmaster();
 441
 442         # Check if the IDS is running.
 443         if(&IDS::ids_is_running()) {
 444                 # Call suricatactrl to perform a reload.
 445                 &IDS::call_suricatactrl("reload");
 446         }
 447
 448         # Reload page.
 449         &reload();
 450
 451 # Download new ruleset.
 452 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 453         # Check if the red device is active.
 454         unless (-e "${General::swroot}/red/active") {
 455                 $errormessage = $Lang::tr{'could not download latest updates'};
 456         }
 457
 458         # Check if enought free disk space is availabe.
 459         if(&IDS::checkdiskspace()) {
 460                 $errormessage = "$Lang::tr{'not enough disk space'}";
 461         }
 462
 463         # Check if any errors happend.
 464         unless ($errormessage) {
 465                 # Lock the webpage and print notice about downloading
 466                 # a new ruleset.
 467                 &working_notice("$Lang::tr{'snort working'}");
 468
 469                 # Call subfunction to download the ruleset.
 470                 if(&IDS::downloadruleset()) {
 471                         $errormessage = $Lang::tr{'could not download latest updates'};
 472
 473                         # Call function to store the errormessage.
 474                         &IDS::_store_error_message($errormessage);
 475
 476                         # Preform a reload of the page.
 477                         &reload();
 478                 } else {
 479                         # Call subfunction to launch oinkmaster.
 480                         &IDS::oinkmaster();
 481
 482                         # Check if the IDS is running.
 483                         if(&IDS::ids_is_running()) {
 484                                 # Call suricatactrl to perform a reload.
 485                                 &IDS::call_suricatactrl("reload");
 486                         }
 487
 488                         # Perform a reload of the page.
 489                         &reload();
 490                 }
 491         }
 492 # Save snort settings.
 493 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 494         my %oldidssettings;
 495         my $reload_page;
 496
 497         # Read-in current (old) IDS settings.
 498         &General::readhash("$IDS::settingsdir/settings", \%oldidssettings);
 499
 500         # Prevent form name from been stored in conf file.
 501         delete $cgiparams{'IDS'};
 502
 503         # Check if an oinkcode has been provided.
 504         if ($cgiparams{'OINKCODE'}) {
 505                 # Check if the oinkcode contains unallowed chars.
 506                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 507                         $errormessage = $Lang::tr{'invalid input for oink code'};
 508                 }
 509         }
 510
 511         # Go on if there are no error messages.
 512         if (!$errormessage) {
 513                 # Store settings into settings file.
 514                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 515         }
 516
 517         # Generate file to store the home net.
 518         &generate_home_net_file();
 519
 520         # Check if the runmode has been changed.
 521         if($cgiparams{'RUN_MODE'} ne $oldidssettings{'RUN_MODE'}) {
 522                 # Open modify sid's file for writing.
 523                 open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
 524
 525                 # Write file header.
 526                 print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 527
 528                 # Check if the configured runmode is IPS.
 529                 if ($cgiparams{'RUN_MODE'} eq 'IPS') {
 530                         # Tell oinkmaster to switch all rules from alert to drop.
 531                         print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 532                 }
 533
 534                 # Close file handle.
 535                 close(FILE);
 536
 537                 # Check if a ruleset exists.
 538                 if (%idsrules) {
 539                         # Lock the webpage and print message.
 540                         &working_notice("$Lang::tr{'snort working'}");
 541
 542                         # Call oinkmaster to alter the ruleset.
 543                         &IDS::oinkmaster();
 544
 545                         # Set reload_page to "True".
 546                         $reload_page="True";
 547                 }
 548         }
 549
 550         # Check if the IDS currently is running.
 551         if(&IDS::ids_is_running()) {
 552                 # Check if ENABLE_IDS is set to on.
 553                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 554                         # Call suricatactrl to perform a reload of suricata.
 555                         &IDS::call_suricatactrl("reload");
 556                 } else {
 557                         # Call suricatactrl to stop suricata.
 558                         &IDS::call_suricatactrl("stop");
 559                 }
 560         } else {
 561                 # Call suricatactrl to start suricata.
 562                 &IDS::call_suricatactrl("start");
 563         }
 564
 565         # Check if the page should be reloaded.
 566         if ($reload_page) {
 567                 # Perform a reload of the page.
 568                 &reload();
 569         }
 570 }
 571
 572 # Read-in idssettings
 573 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 574
 575 # If the runmode has not been configured yet, set default value.
 576 unless(exists($idssettings{'RUN_MODE'})) {
 577         # Set default to IPS.
 578         $idssettings{'RUN_MODE'} = 'IPS';
 579 }
 580
 581 # Read-in ignored hosts.
 582 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 583
 584 $checked{'ENABLE_IDS'}{'off'} = '';
 585 $checked{'ENABLE_IDS'}{'on'} = '';
 586 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 587 $checked{'RUN_MODE'}{'IDS'} = '';
 588 $checked{'RUN_MODE'}{'IPS'} = '';
 589 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
 590 $selected{'RULES'}{'nothing'} = '';
 591 $selected{'RULES'}{'community'} = '';
 592 $selected{'RULES'}{'emerging'} = '';
 593 $selected{'RULES'}{'registered'} = '';
 594 $selected{'RULES'}{'subscripted'} = '';
 595 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 596
 597 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 598
 599 ### Java Script ###
 600 print <<END
 601 <script>
 602         // Tiny java script function to show/hide the rules
 603         // of a given category.
 604         function showhide(tblname) {
 605                 \$("#" + tblname).toggle();
 606         }
 607 </script>
 608 END
 609 ;
 610
 611 &Header::openbigbox('100%', 'left', '', $errormessage);
 612
 613 if ($errormessage) {
 614         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 615         print "<class name='base'>$errormessage\n";
 616         print "&nbsp;</class>\n";
 617         &Header::closebox();
 618 }
 619
 620 # Draw current state of the IDS
 621 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 622
 623 # Check if the IDS is running and obtain the process-id.
 624 my $pid = &IDS::ids_is_running();
 625
 626 # Display some useful information, if suricata daemon is running.
 627 if ($pid) {
 628         # Gather used memory.
 629         my $memory = &get_memory_usage($pid);
 630
 631         print <<END;
 632                 <table width='95%' cellspacing='0' class='tbl'>
 633                         <tr>
 634                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 635                         </tr>
 636
 637                         <tr>
 638                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 639                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 640                         </tr>
 641
 642                         <tr>
 643                                 <td class='base'></td>
 644                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 645                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 646                         </tr>
 647
 648                         <tr>
 649                                 <td class='base'></td>
 650                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 651                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 652                         </tr>
 653                 </table>
 654 END
 655 } else {
 656         # Otherwise display a hint that the service is not launched.
 657         print <<END;
 658                 <table width='95%' cellspacing='0' class='tbl'>
 659                         <tr>
 660                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 661                         </tr>
 662
 663                         <tr>
 664                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 665                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 666                         </tr>
 667                 </table>
 668 END
 669 }
 670 &Header::closebox();
 671
 672 # Draw elements for IDS configuration.
 673 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 674
 675 my $rulesdate;
 676
 677 # Check if a ruleset allready has been downloaded.
 678 if ( -f "$IDS::rulestarball"){
 679         # Call stat on the filename to obtain detailed information.
 680         my @Info = stat("$IDS::rulestarball");
 681
 682         # Grab details about the creation time.
 683         $rulesdate = localtime($Info[9]);
 684 }
 685
 686 print <<END
 687 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 688         <table width='100%' border='0'>
 689                 <tr>
 690                         <td class='base' colspan='4'>
 691                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 692                         </td>
 693                 </tr>
 694
 695                 <tr>
 696                         <td colspan='4'><br><br></td>
 697                 </tr>
 698
 699                 <tr>
 700                         <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
 701                 </tr>
 702
 703                 <tr>
 704                         <td class='base' colspan='4'>
 705                                 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'} &nbsp&nbsp&nbsp
 706                                 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
 707                         </td>
 708                 </tr>
 709
 710                 <tr>
 711                         <td colspan='4'><br></td>
 712                 </tr>
 713
 714                 <tr>
 715                         <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
 716                 </tr>
 717
 718                 <tr>
 719 END
 720 ;
 721
 722 # Loop through the array of available networks and print config options.
 723 foreach my $zone (@network_zones) {
 724         my $checked_input;
 725         my $checked_forward;
 726
 727         # Convert current zone name to upper case.
 728         my $zone_upper = uc($zone);
 729
 730         # Grab checkbox status from settings hash.
 731         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 732                 $checked_input = "checked = 'checked'";
 733         }
 734
 735         print "<td class='base' width='25%'>\n";
 736         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
 737         print "</td>\n";
 738 }
 739
 740 print <<END
 741                 </tr>
 742
 743                 <tr>
 744                         <td colspan='4'><br><br></td>
 745                 </tr>
 746
 747                 <tr>
 748                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 749                 </tr>
 750
 751                 <tr>
 752                         <td colspan='4'><select name='RULES'>
 753                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 754                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 755                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 756                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 757                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 758                         </select>
 759                         </td>
 760                 </tr>
 761
 762                 <tr>
 763                         <td colspan='4'>
 764                                 <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>
 765                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 766                         </td>
 767                 </tr>
 768
 769                 <tr>
 770                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 771                 </tr>
 772
 773                 <tr>
 774                         <td colspan='4' align='left'><br>
 775                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 776                         </td>
 777
 778                 </tr>
 779         </table>
 780
 781         <br><br>
 782
 783         <table width='100%'>
 784                 <tr>
 785                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 786                 </tr>
 787         </table>
 788 </form>
 789 END
 790 ;
 791
 792 &Header::closebox();
 793
 794 #
 795 # Whitelist / Ignorelist
 796 #
 797 &Header::openbox('100%', 'center', $Lang::tr{'guardian ignored hosts'});
 798
 799 print <<END;
 800         <table width='100%'>
 801                 <tr>
 802                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 803                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 804                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 805                 </tr>
 806 END
 807                 # Check if some hosts have been added to be ignored.
 808                 if (keys (%ignored)) {
 809                         my $col = "";
 810
 811                         # Loop through all entries of the hash.
 812                         while( (my $key) = each %ignored)  {
 813                                 # Assign data array positions to some nice variable names.
 814                                 my $address = $ignored{$key}[0];
 815                                 my $remark = $ignored{$key}[1];
 816                                 my $status  = $ignored{$key}[2];
 817
 818                                 # Check if the key (id) number is even or not.
 819                                 if ($cgiparams{'ID'} eq $key) {
 820                                         $col="bgcolor='${Header::colouryellow}'";
 821                                 } elsif ($key % 2) {
 822                                         $col="bgcolor='$color{'color22'}'";
 823                                 } else {
 824                                         $col="bgcolor='$color{'color20'}'";
 825                                 }
 826
 827                                 # Choose icon for the checkbox.
 828                                 my $gif;
 829                                 my $gdesc;
 830
 831                                 # Check if the status is enabled and select the correct image and description.
 832                                 if ($status eq 'enabled' ) {
 833                                         $gif = 'on.gif';
 834                                         $gdesc = $Lang::tr{'click to disable'};
 835                                 } else {
 836                                         $gif = 'off.gif';
 837                                         $gdesc = $Lang::tr{'click to enable'};
 838                                 }
 839
 840 print <<END;
 841                                 <tr>
 842                                         <td width='20%' class='base' $col>$address</td>
 843                                         <td width='65%' class='base' $col>$remark</td>
 844
 845                                         <td align='center' $col>
 846                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 847                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
 848                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
 849                                                         <input type='hidden' name='ID' value='$key' />
 850                                                 </form>
 851                                         </td>
 852
 853                                         <td align='center' $col>
 854                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 855                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
 856                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
 857                                                         <input type='hidden' name='ID' value='$key' />
 858                                                 </form>
 859                                         </td>
 860
 861                                         <td align='center' $col>
 862                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
 863                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
 864                                                         <input type='hidden' name='ID' value='$key'>
 865                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
 866                                                 </form>
 867                                         </td>
 868                                 </tr>
 869 END
 870                         }
 871                 } else {
 872                         # Print notice that currently no hosts are ignored.
 873                         print "<tr>\n";
 874                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
 875                         print "</tr>\n";
 876                 }
 877
 878         print "</table>\n";
 879
 880         # Section to add new elements or edit existing ones.
 881 print <<END;
 882         <br>
 883         <hr>
 884         <br>
 885
 886         <div align='center'>
 887                 <table width='100%'>
 888 END
 889
 890         # Assign correct headline and button text.
 891         my $buttontext;
 892         my $entry_address;
 893         my $entry_remark;
 894
 895         # Check if an ID (key) has been given, in this case an existing entry should be edited.
 896         if ($cgiparams{'ID'} ne '') {
 897                 $buttontext = $Lang::tr{'update'};
 898                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
 899
 900                         # Grab address and remark for the given key.
 901                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
 902                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
 903                 } else {
 904                         $buttontext = $Lang::tr{'add'};
 905                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
 906                 }
 907
 908 print <<END;
 909                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 910                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
 911                         <tr>
 912                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
 913                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
 914
 915                                 <td width='30%'>$Lang::tr{'remark'}: </td>
 916                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
 917                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
 918                         </tr>
 919                         </form>
 920                 </table>
 921         </div>
 922 END
 923
 924 &Header::closebox();
 925
 926 # Only show the section for configuring the ruleset if one is present.
 927 if (%idsrules) {
 928         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 929
 930                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 931
 932                 # Output display table for rule files
 933                 print "<table width='100%'>\n";
 934
 935                 # Local variable required for java script to show/hide
 936                 # rules of a rulefile.
 937                 my $rulesetcount = 1;
 938
 939                 # Loop over each rule file
 940                 foreach my $rulefile (sort keys(%idsrules)) {
 941                         my $rulechecked = '';
 942
 943                         # Check if rule file is enabled
 944                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 945                                 $rulechecked = 'CHECKED';
 946                         }
 947
 948                         # Table and rows for the rule files.
 949                         print"<tr>\n";
 950                         print"<td class='base' width='5%'>\n";
 951                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 952                         print"</td>\n";
 953                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 954                         print"<td class='base' width='5%' align='right'>\n";
 955                         print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 956                         print"</td>\n";
 957                         print"</tr>\n";
 958
 959                         # Rows which will be hidden per default and will contain the single rules.
 960                         print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 961                         print"<td colspan='3'>\n";
 962
 963                         # Local vars
 964                         my $lines;
 965                         my $rows;
 966                         my $col;
 967
 968                         # New table for the single rules.
 969                         print "<table width='100%'>\n";
 970
 971                         # Loop over rule file rules
 972                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 973                                 # Local vars
 974                                 my $ruledefchecked = '';
 975
 976                                 # Skip rulefile itself.
 977                                 next if ($sid eq "Rulefile");
 978
 979                                 # If 2 rules have been displayed, start a new row
 980                                 if (($lines % 2) == 0) {
 981                                         print "</tr><tr>\n";
 982
 983                                         # Increase rows by once.
 984                                         $rows++;
 985                                 }
 986
 987                                 # Colour lines.
 988                                 if ($rows % 2) {
 989                                         $col="bgcolor='$color{'color20'}'";
 990                                 } else {
 991                                         $col="bgcolor='$color{'color22'}'";
 992                                 }
 993
 994                                 # Set rule state
 995                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 996                                         $ruledefchecked = 'CHECKED';
 997                                 }
 998
 999                                 # Create rule checkbox and display rule description
1000                                 print "<td class='base' width='5%' align='right' $col>\n";
1001                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1002                                 print "</td>\n";
1003                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1004
1005                                 # Increment rule count
1006                                 $lines++;
1007                         }
1008
1009                         # If do not have a second rule for row, create empty cell
1010                         if (($lines % 2) != 0) {
1011                                 print "<td class='base'></td>";
1012                         }
1013
1014                         # Close display table
1015                         print "</tr></table></td></tr>";
1016
1017                         # Finished whith the rule file, increase count.
1018                         $rulesetcount++;
1019                 }
1020
1021                 # Close display table
1022                 print "</table>";
1023
1024 print <<END
1025 <table width='100%'>
1026 <tr>
1027         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
1028                 &nbsp; <!-- space for future online help link -->
1029         </td>
1030 </tr>
1031 </table>
1032 </form>
1033 END
1034 ;
1035         &Header::closebox();
1036 }
1037
1038 &Header::closebigbox();
1039 &Header::closepage();
1040
1041 #
1042 ## A function to display a notice, to lock the webpage and
1043 ## tell the user which action currently will be performed.
1044 #
1045 sub working_notice ($) {
1046         my ($message) = @_;
1047
1048         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1049         &Header::openbigbox('100%', 'left', '', $errormessage);
1050         &Header::openbox( 'Waiting', 1,);
1051                 print <<END;
1052                         <table>
1053                                 <tr>
1054                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1055                                         <td>$message</td>
1056                                 </tr>
1057                         </table>
1058 END
1059         &Header::closebox();
1060         &Header::closebigbox();
1061         &Header::closepage();
1062 }
1063
1064 #
1065 ## A tiny function to perform a reload of the webpage after one second.
1066 #
1067 sub reload () {
1068         print "<meta http-equiv='refresh' content='1'>\n";
1069
1070         # Stop the script.
1071         exit;
1072 }
1073
1074 #
1075 ## Private function to read-in and parse rules of a given rulefile.
1076 #
1077 ## The given file will be read, parsed and all valid rules will be stored by ID,
1078 ## message/description and it's state in the idsrules hash.
1079 #
1080 sub readrulesfile ($) {
1081         my $rulefile = shift;
1082
1083         # Open rule file and read in contents
1084         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1085
1086         # Store file content in an array.
1087         my @lines = <RULEFILE>;
1088
1089         # Close file.
1090         close(RULEFILE);
1091
1092         # Loop over rule file contents
1093         foreach my $line (@lines) {
1094                 # Remove whitespaces.
1095                 chomp $line;
1096
1097                 # Skip blank  lines.
1098                 next if ($line =~ /^\s*$/);
1099
1100                 # Local vars.
1101                 my $sid;
1102                 my $msg;
1103
1104                 # Gather rule sid and message from the ruleline.
1105                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1106                         $msg = $1;
1107                         $sid = $2;
1108
1109                         # Check if a rule has been found.
1110                         if ($sid && $msg) {
1111                                 # Add rule to the idsrules hash.
1112                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1113
1114                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1115                                 if ($line =~ /^\#/) {
1116                                         # If yes, the rule is disabled.
1117                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1118                                 } else {
1119                                         # Otherwise the rule is enabled.
1120                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1121                                 }
1122                         }
1123                 }
1124         }
1125 }
1126
1127 #
1128 ## Function to get the used memory of a given process-id.
1129 #
1130 sub get_memory_usage($) {
1131         my ($pid) = @_;
1132
1133         my $memory = 0;
1134
1135         # Try to open the status file for the given process-id on the pseudo
1136         # file system proc.
1137         if (open(FILE, "/proc/$pid/status")) {
1138                 # Loop through the entire file.
1139                 while (<FILE>) {
1140                         # Splitt current line content and store them into variables.
1141                         my ($key, $value) = split(":", $_, 2);
1142
1143                         # Check if the current key is the one which contains the memory usage.
1144                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1145                         # of the entire process.
1146                         if ($key eq "VmRSS") {
1147                                 # Found the memory usage add it to the memory variable.
1148                                 $memory += $value;
1149
1150                                 # Break the loop.
1151                                 last;
1152                         }
1153                 }
1154
1155                 # Close file handle.
1156                 close(FILE);
1157
1158                 # Return memory usage.
1159                 return $memory;
1160         }
1161
1162         # If the file could not be open, return nothing.
1163         return;
1164 }
1165
1166 #
1167 ## Function to generate the file which contains the home net information.
1168 #
1169 sub generate_home_net_file() {
1170         my %netsettings;
1171
1172         # Read-in network settings.
1173         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
1174
1175         # Get available network zones.
1176         my @network_zones = &IDS::get_available_network_zones();
1177
1178         # Temporary array to store network address and prefix of the configured
1179         # networks.
1180         my @networks;
1181
1182         # Loop through the array of available network zones.
1183         foreach my $zone (@network_zones) {
1184                 # Skip the red network - It never can be part to the home_net!
1185                 next if($zone eq "red");
1186
1187                 # Convert current zone name into upper case.
1188                 $zone = uc($zone);
1189
1190                 # Generate key to access the required data from the netsettings hash.
1191                 my $zone_netaddress = $zone . "_NETADDRESS";
1192                 my $zone_netmask = $zone . "_NETMASK";
1193
1194                 # Obtain the settings from the netsettings hash.
1195                 my $netaddress = $netsettings{$zone_netaddress};
1196                 my $netmask = $netsettings{$zone_netmask};
1197
1198                 # Convert the subnetmask into prefix notation.
1199                 my $prefix = &Network::convert_netmask2prefix($netmask);
1200
1201                 # Generate full network string.
1202                 my $network = join("/", $netaddress,$prefix);
1203
1204                 # Check if the network is valid.
1205                 if(&Network::check_subnet($network)) {
1206                         # Add the generated network to the array of networks.
1207                         push(@networks, $network);
1208                 }
1209         }
1210
1211         # Format home net declaration.
1212         my $line = "\"\[";
1213
1214         # Loop through the array of networks.
1215         foreach my $network (@networks) {
1216                 # Add the network to the line.
1217                 $line = "$line" . "$network";
1218
1219                 # Check if the current network was the last in the array.
1220                 if ($network eq $networks[-1]) {
1221                         # Close the line.
1222                         $line = "$line" . "\]\"";
1223                 } else {
1224                         # Add "," for the next network.
1225                         $line = "$line" . "\,";
1226                 }
1227         }
1228
1229         # Open file to store the addresses of the home net.
1230         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
1231
1232         # Print yaml header.
1233         print FILE "%YAML 1.1\n";
1234         print FILE "---\n\n";
1235
1236         # Print notice about autogenerated file.
1237         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
1238
1239         # Print the generated and required HOME_NET declaration to the file.
1240         print FILE "HOME_NET:\t$line\n";
1241
1242         # Close file handle.
1243         close(FILE);
1244
1245 }
1246
1247 #
1248 ## Function to generate the rules file with whitelisted addresses.
1249 #
1250 sub GenerateIgnoreFile() {
1251         my %ignored = ();
1252
1253         # SID range 1000000-1999999 Reserved for Local Use
1254         # Put your custom rules in this range to avoid conflicts
1255         my $sid = 1500000;
1256
1257         # Read-in ignoredfile.
1258         &General::readhasharray($ignoredfile, \%ignored);
1259
1260         # Open ignorefile for writing.
1261         open(FILE, ">$whitelistfile") or die "Could not write to $whitelistfile. $!\n";
1262
1263         # Config file header.
1264         print FILE "# Autogenerated file.\n";
1265         print FILE "# All user modifications will be overwritten.\n\n";
1266
1267         # Add all user defined addresses to the whitelist.
1268         #
1269         # Check if the hash contains any elements.
1270         if (keys (%ignored)) {
1271                 # Loop through the entire hash and write the host/network
1272                 # and remark to the ignore file.
1273                 while ( (my $key) = each %ignored) {
1274                         my $address = $ignored{$key}[0];
1275                         my $remark = $ignored{$key}[1];
1276                         my $status = $ignored{$key}[2];
1277
1278                         # Check if the status of the entry is "enabled".
1279                         if ($status eq "enabled") {
1280                                 # Check if the address/network is valid.
1281                                 if ((&General::validip($address)) || (&General::validipandmask($address))) {
1282                                         # Write rule line to the file to pass any traffic from this IP
1283                                         print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
1284
1285                                         # Increment sid.
1286                                         $sid++;
1287                                 }
1288                         }
1289                 }
1290         }
1291
1292         close(FILE);
1293 }
1294
1295 #
1296 ## Function to read-in the given enabled or disables sids file.
1297 #
1298 sub read_enabled_disabled_sids_file($) {
1299         my ($file) = @_;
1300
1301         # Temporary hash to store the sids and their state. It will be
1302         # returned at the end of this function.
1303         my %temphash;
1304
1305         # Open the given filename.
1306         open(FILE, "$file") or die "Could not open $file. $!\n";
1307
1308         # Loop through the file.
1309         while(<FILE>) {
1310                 # Remove newlines.
1311                 chomp $_;
1312
1313                 # Skip blank lines.
1314                 next if ($_ =~ /^\s*$/);
1315
1316                 # Skip coments.
1317                 next if ($_ =~ /^\#/);
1318
1319                 # Splitt line into sid and state part.
1320                 my ($state, $sid) = split(" ", $_);
1321
1322                 # Skip line if the sid is not numeric.
1323                 next unless ($sid =~ /\d+/ );
1324
1325                 # Check if the sid was enabled.
1326                 if ($state eq "enablesid") {
1327                         # Add the sid and its state as enabled to the temporary hash.
1328                         $temphash{$sid} = "enabled";
1329                 # Check if the sid was disabled.
1330                 } elsif ($state eq "disablesid") {
1331                         # Add the sid and its state as disabled to the temporary hash.
1332                         $temphash{$sid} = "disabled";
1333                 # Invalid state - skip the current sid and state.
1334                 } else {
1335                         next;
1336                 }
1337         }
1338
1339         # Close filehandle.
1340         close(FILE);
1341
1342         # Return the hash.
1343         return %temphash;
1344 }