html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2020  IPFire Team  <info@ipfire.org>                     #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 use strict;
  23
  24 # enable only the following on debugging purpose
  25 #use warnings;
  26 #use CGI::Carp 'fatalsToBrowser';
  27
  28 require '/var/ipfire/general-functions.pl';
  29 require "${General::swroot}/lang.pl";
  30 require "${General::swroot}/header.pl";
  31 require "${General::swroot}/ids-functions.pl";
  32 require "${General::swroot}/network-functions.pl";
  33
  34 # Import ruleset providers file.
  35 require "$IDS::rulesetsourcesfile";
  36
  37 my %color = ();
  38 my %mainsettings = ();
  39 my %idsrules = ();
  40 my %idssettings=();
  41 my %rulessettings=();
  42 my %cgiparams=();
  43 my %checked=();
  44 my %selected=();
  45 my %ignored=();
  46
  47 # Read-in main settings, for language, theme and colors.
  48 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  49 &General::readhash("/srv/web/ipfire/html/themes/ipfire/include/colors.txt", \%color);
  50
  51 # Get the available network zones, based on the config type of the system and store
  52 # the list of zones in an array.
  53 my @network_zones = &Network::get_available_network_zones();
  54
  55 # Check if openvpn is started and add it to the array of network zones.
  56 if ( -e "/var/run/openvpn.pid") {
  57         push(@network_zones, "ovpn");
  58 }
  59
  60 my $errormessage;
  61
  62 # Create files if they does not exist yet.
  63 &IDS::check_and_create_filelayout();
  64
  65 # Hash which contains the colour code of a network zone.
  66 my %colourhash = (
  67         'red' => $Header::colourred,
  68         'green' => $Header::colourgreen,
  69         'blue' => $Header::colourblue,
  70         'orange' => $Header::colourorange,
  71         'ovpn' => $Header::colourovpn
  72 );
  73
  74 &Header::showhttpheaders();
  75
  76 #Get GUI values
  77 &Header::getcgihash(\%cgiparams);
  78
  79 ## Add/edit an entry to the ignore file.
  80 #
  81 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'add'}) || ($cgiparams{'WHITELIST'} eq $Lang::tr{'update'})) {
  82
  83         # Check if any input has been performed.
  84         if ($cgiparams{'IGNORE_ENTRY_ADDRESS'} ne '') {
  85
  86                 # Check if the given input is no valid IP-address or IP-address with subnet, display an error message.
  87                 if ((!&General::validip($cgiparams{'IGNORE_ENTRY_ADDRESS'})) && (!&General::validipandmask($cgiparams{'IGNORE_ENTRY_ADDRESS'}))) {
  88                         $errormessage = "$Lang::tr{'guardian invalid address or subnet'}";
  89                 }
  90         } else {
  91                 $errormessage = "$Lang::tr{'guardian empty input'}";
  92         }
  93
  94         # Go further if there was no error.
  95         if ($errormessage eq '') {
  96                 my %ignored = ();
  97                 my $id;
  98                 my $status;
  99
 100                 # Assign hash values.
 101                 my $new_entry_address = $cgiparams{'IGNORE_ENTRY_ADDRESS'};
 102                 my $new_entry_remark = $cgiparams{'IGNORE_ENTRY_REMARK'};
 103
 104                 # Read-in ignoredfile.
 105                 &General::readhasharray($IDS::ignored_file, \%ignored);
 106
 107                 # Check if we should edit an existing entry and got an ID.
 108                 if (($cgiparams{'WHITELIST'} eq $Lang::tr{'update'}) && ($cgiparams{'ID'})) {
 109                         # Assin the provided id.
 110                         $id = $cgiparams{'ID'};
 111
 112                         # Undef the given ID.
 113                         undef($cgiparams{'ID'});
 114
 115                         # Grab the configured status of the corresponding entry.
 116                         $status = $ignored{$id}[2];
 117                 } else {
 118                         # Each newly added entry automatically should be enabled.
 119                         $status = "enabled";
 120
 121                         # Generate the ID for the new entry.
 122                         #
 123                         # Sort the keys by their ID and store them in an array.
 124                         my @keys = sort { $a <=> $b } keys %ignored;
 125
 126                         # Reverse the key array.
 127                         my @reversed = reverse(@keys);
 128
 129                         # Obtain the last used id.
 130                         my $last_id = @reversed[0];
 131
 132                         # Increase the last id by one and use it as id for the new entry.
 133                         $id = ++$last_id;
 134                 }
 135
 136                 # Add/Modify the entry to/in the ignored hash.
 137                 $ignored{$id} = ["$new_entry_address", "$new_entry_remark", "$status"];
 138
 139                 # Write the changed ignored hash to the ignored file.
 140                 &General::writehasharray($IDS::ignored_file, \%ignored);
 141
 142                 # Regenerate the ignore file.
 143                 &IDS::generate_ignore_file();
 144         }
 145
 146         # Check if the IDS is running.
 147         if(&IDS::ids_is_running()) {
 148                 # Call suricatactrl to perform a reload.
 149                 &IDS::call_suricatactrl("reload");
 150         }
 151
 152 ## Toggle Enabled/Disabled for an existing entry on the ignore list.
 153 #
 154
 155 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'toggle enable disable'}) {
 156         my %ignored = ();
 157
 158         # Only go further, if an ID has been passed.
 159         if ($cgiparams{'ID'}) {
 160                 # Assign the given ID.
 161                 my $id = $cgiparams{'ID'};
 162
 163                 # Undef the given ID.
 164                 undef($cgiparams{'ID'});
 165
 166                 # Read-in ignoredfile.
 167                 &General::readhasharray($IDS::ignored_file, \%ignored);
 168
 169                 # Grab the configured status of the corresponding entry.
 170                 my $status = $ignored{$id}[2];
 171
 172                 # Switch the status.
 173                 if ($status eq "disabled") {
 174                         $status = "enabled";
 175                 } else {
 176                         $status = "disabled";
 177                 }
 178
 179                 # Modify the status of the existing entry.
 180                 $ignored{$id} = ["$ignored{$id}[0]", "$ignored{$id}[1]", "$status"];
 181
 182                 # Write the changed ignored hash to the ignored file.
 183                 &General::writehasharray($IDS::ignored_file, \%ignored);
 184
 185                 # Regenerate the ignore file.
 186                 &IDS::generate_ignore_file();
 187
 188                 # Check if the IDS is running.
 189                 if(&IDS::ids_is_running()) {
 190                         # Call suricatactrl to perform a reload.
 191                         &IDS::call_suricatactrl("reload");
 192                 }
 193         }
 194
 195 ## Remove entry from ignore list.
 196 #
 197 } elsif ($cgiparams{'WHITELIST'} eq $Lang::tr{'remove'}) {
 198         my %ignored = ();
 199
 200         # Read-in ignoredfile.
 201         &General::readhasharray($IDS::ignored_file, \%ignored);
 202
 203         # Drop entry from the hash.
 204         delete($ignored{$cgiparams{'ID'}});
 205
 206         # Undef the given ID.
 207         undef($cgiparams{'ID'});
 208
 209         # Write the changed ignored hash to the ignored file.
 210         &General::writehasharray($IDS::ignored_file, \%ignored);
 211
 212         # Regenerate the ignore file.
 213         &IDS::generate_ignore_file();
 214
 215         # Check if the IDS is running.
 216         if(&IDS::ids_is_running()) {
 217                 # Call suricatactrl to perform a reload.
 218                 &IDS::call_suricatactrl("reload");
 219         }
 220 }
 221
 222 # Check if the page is locked, in this case, the ids_page_lock_file exists.
 223 if (-e $IDS::ids_page_lock_file) {
 224         # Lock the webpage and print notice about autoupgrade of the ruleset
 225         # is in progess.
 226         &working_notice("$Lang::tr{'ids ruleset autoupdate in progress'}");
 227
 228         # Loop and check if the file still exists.
 229         while(-e $IDS::ids_page_lock_file) {
 230                 # Sleep for a second and re-check.
 231                 sleep 1;
 232         }
 233
 234         # Page has been unlocked, perform a reload.
 235         &reload();
 236 }
 237
 238 # Check if any error has been stored.
 239 if (-e $IDS::storederrorfile) {
 240         # Open file to read in the stored error message.
 241         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
 242
 243         # Read the stored error message.
 244         $errormessage = <FILE>;
 245
 246         # Close file.
 247         close (FILE);
 248
 249         # Delete the file, which is now not longer required.
 250         unlink($IDS::storederrorfile);
 251 }
 252
 253 ## Grab all available rules and store them in the idsrules hash.
 254 #
 255 # Open rules directory and do a directory listing.
 256 opendir(DIR, $IDS::rulespath) or die $!;
 257         # Loop through the direcory.
 258         while (my $file = readdir(DIR)) {
 259
 260                 # We only want files.
 261                 next unless (-f "$IDS::rulespath/$file");
 262
 263                 # Ignore empty files.
 264                 next if (-z "$IDS::rulespath/$file");
 265
 266                 # Use a regular expression to find files ending in .rules
 267                 next unless ($file =~ m/\.rules$/);
 268
 269                 # Ignore files which are not read-able.
 270                 next unless (-R "$IDS::rulespath/$file");
 271
 272                 # Skip whitelist rules file.
 273                 next if( $file eq "whitelist.rules");
 274
 275                 # Call subfunction to read-in rulefile and add rules to
 276                 # the idsrules hash.
 277                 &readrulesfile("$file");
 278         }
 279
 280 closedir(DIR);
 281
 282 # Gather used rulefiles.
 283 #
 284 # Check if the file for activated rulefiles is not empty.
 285 if(-f $IDS::used_rulefiles_file) {
 286         # Open the file for used rulefile and read-in content.
 287         open(FILE, $IDS::used_rulefiles_file) or die "Could not open $IDS::used_rulefiles_file. $!\n";
 288
 289         # Read-in content.
 290         my @lines = <FILE>;
 291
 292         # Close file.
 293         close(FILE);
 294
 295         # Loop through the array.
 296         foreach my $line (@lines) {
 297                 # Remove newlines.
 298                 chomp($line);
 299
 300                 # Skip comments.
 301                 next if ($line =~ /\#/);
 302
 303                 # Skip blank  lines.
 304                 next if ($line =~ /^\s*$/);
 305
 306                 # Gather rule sid and message from the ruleline.
 307                 if ($line =~ /.*- (.*)/) {
 308                         my $rulefile = $1;
 309
 310                         # Check if the current rulefile exists in the %idsrules hash.
 311                         # If not, the file probably does not exist anymore or contains
 312                         # no rules.
 313                         if($idsrules{$rulefile}) {
 314                                 # Add the rulefile state to the %idsrules hash.
 315                                 $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 316                         }
 317                 }
 318         }
 319 }
 320
 321 # Save ruleset configuration.
 322 if ($cgiparams{'RULESET'} eq $Lang::tr{'save'}) {
 323         my %oldsettings;
 324
 325         # Read-in current (old) IDS settings.
 326         &General::readhash("$IDS::rules_settings_file", \%oldsettings);
 327
 328         # Prevent form name from been stored in conf file.
 329         delete $cgiparams{'RULESET'};
 330
 331         # Check if the choosen vendor (URL) requires an subscription/oinkcode.
 332         if ($IDS::Ruleset::Providers{$cgiparams{'RULES'}}{'requires_subscription'} eq "True") {
 333                 # Check if an subscription/oinkcode has been provided.
 334                 if ($cgiparams{'OINKCODE'}) {
 335                         # Check if the oinkcode contains unallowed chars.
 336                         unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 337                                 $errormessage = $Lang::tr{'invalid input for oink code'};
 338                         }
 339                 } else {
 340                         # Print an error message, that an subsription/oinkcode is required for this
 341                         # vendor.
 342                         $errormessage = $Lang::tr{'ids oinkcode required'};
 343                 }
 344         }
 345
 346         # Go on if there are no error messages.
 347         if (!$errormessage) {
 348                 # Store settings into settings file.
 349                 &General::writehash("$IDS::rules_settings_file", \%cgiparams);
 350
 351                 # Check if the the automatic rule update hass been touched.
 352                 if($cgiparams{'AUTOUPDATE_INTERVAL'} ne $oldsettings{'AUTOUPDATE_INTERVAL'}) {
 353                         # Call suricatactrl to set the new interval.
 354                         &IDS::call_suricatactrl("cron", $cgiparams{'AUTOUPDATE_INTERVAL'});
 355                 }
 356
 357                 # Check if a ruleset is present - if not or the source has been changed download it.
 358                 if((! %idsrules) || ($oldsettings{'RULES'} ne $cgiparams{'RULES'})) {
 359                         # Check if the red device is active.
 360                         unless (-e "${General::swroot}/red/active") {
 361                                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 362                         }
 363
 364                         # Check if enough free disk space is availabe.
 365                         if(&IDS::checkdiskspace()) {
 366                                 $errormessage = "$Lang::tr{'not enough disk space'}";
 367                         }
 368
 369                         # Check if any errors happend.
 370                         unless ($errormessage) {
 371                                 # Lock the webpage and print notice about downloading
 372                                 # a new ruleset.
 373                                 &working_notice("$Lang::tr{'ids working'}");
 374
 375                                 # Write the modify sid's file and pass the taken ruleaction.
 376                                 &IDS::write_modify_sids_file();
 377
 378                                 # Call subfunction to download the ruleset.
 379                                 if(&IDS::downloadruleset()) {
 380                                         $errormessage = $Lang::tr{'could not download latest updates'};
 381
 382                                         # Call function to store the errormessage.
 383                                         &IDS::_store_error_message($errormessage);
 384                                 } else {
 385                                         # Call subfunction to launch oinkmaster.
 386                                         &IDS::oinkmaster();
 387                                 }
 388
 389                                 # Check if the IDS is running.
 390                                 if(&IDS::ids_is_running()) {
 391                                         # Call suricatactrl to stop the IDS - because of the changed
 392                                         # ruleset - the use has to configure it before suricata can be
 393                                         # used again.
 394                                         &IDS::call_suricatactrl("stop");
 395                                 }
 396
 397                                 # Perform a reload of the page.
 398                                 &reload();
 399                         }
 400                 }
 401         }
 402
 403 # Save ruleset.
 404 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'ids apply'}) {
 405         # Arrays to store which rulefiles have been enabled and will be used.
 406         my @enabled_rulefiles;
 407
 408         # Hash to store the user-enabled and disabled sids.
 409         my %enabled_disabled_sids;
 410
 411         # Store if a restart of suricata is required.
 412         my $suricata_restart_required;
 413
 414         # Loop through the hash of idsrules.
 415         foreach my $rulefile(keys %idsrules) {
 416                 # Check if the state of the rulefile has been changed.
 417                 unless ($cgiparams{$rulefile} eq $idsrules{$rulefile}{'Rulefile'}{'State'}) {
 418                         # A restart of suricata is required to apply the changes of the used rulefiles.
 419                         $suricata_restart_required = 1;
 420                 }
 421
 422                 # Check if the rulefile is enabled.
 423                 if ($cgiparams{$rulefile} eq "on") {
 424                         # Add rulefile to the array of enabled rulefiles.
 425                         push(@enabled_rulefiles, $rulefile);
 426
 427                         # Drop item from cgiparams hash.
 428                         delete $cgiparams{$rulefile};
 429                 }
 430         }
 431
 432         # Read-in the files for enabled/disabled sids.
 433         # This will be done by calling the read_enabled_disabled_sids_file function two times
 434         # and merge the returned hashes together into the enabled_disabled_sids hash.
 435         %enabled_disabled_sids = (
 436                 &read_enabled_disabled_sids_file($IDS::disabled_sids_file),
 437                 &read_enabled_disabled_sids_file($IDS::enabled_sids_file));
 438
 439         # Loop through the hash of idsrules.
 440         foreach my $rulefile (keys %idsrules) {
 441                 # Loop through the single rules of the rulefile.
 442                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 443                         # Skip the current sid if it is not numeric.
 444                         next unless ($sid =~ /\d+/ );
 445
 446                         # Check if there exists a key in the cgiparams hash for this sid.
 447                         if (exists($cgiparams{$sid})) {
 448                                 # Look if the rule is disabled.
 449                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 450                                         # Check if the state has been set to 'on'.
 451                                         if ($cgiparams{$sid} eq "on") {
 452                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 453                                                 $enabled_disabled_sids{$sid} = "enabled";
 454
 455                                                 # Drop item from cgiparams hash.
 456                                                 delete $cgiparams{$rulefile}{$sid};
 457                                         }
 458                                 }
 459                         } else {
 460                                 # Look if the rule is enabled.
 461                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 462                                         # Check if the state is 'on' and should be disabled.
 463                                         # In this case there is no entry
 464                                         # for the sid in the cgiparams hash.
 465                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 466                                         $enabled_disabled_sids{$sid} = "disabled";
 467
 468                                         # Drop item from cgiparams hash.
 469                                         delete $cgiparams{$rulefile}{$sid};
 470                                 }
 471                         }
 472                 }
 473         }
 474
 475         # Open enabled sid's file for writing.
 476         open(ENABLED_FILE, ">$IDS::enabled_sids_file") or die "Could not write to $IDS::enabled_sids_file. $!\n";
 477
 478         # Open disabled sid's file for writing.
 479         open(DISABLED_FILE, ">$IDS::disabled_sids_file") or die "Could not write to $IDS::disabled_sids_file. $!\n";
 480
 481         # Write header to the files.
 482         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 483         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 484
 485         # Check if the hash for enabled/disabled files contains any entries.
 486         if (%enabled_disabled_sids) {
 487                 # Loop through the hash.
 488                 foreach my $sid (keys %enabled_disabled_sids) {
 489                         # Check if the sid is enabled.
 490                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 491                                 # Print the sid to the enabled_sids file.
 492                                 print ENABLED_FILE "enablesid $sid\n";
 493                         # Check if the sid is disabled.
 494                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 495                                 # Print the sid to the disabled_sids file.
 496                                 print DISABLED_FILE "disablesid $sid\n";
 497                         # Something strange happende - skip the current sid.
 498                         } else {
 499                                 next;
 500                         }
 501                 }
 502         }
 503
 504         # Close file for enabled_sids after writing.
 505         close(ENABLED_FILE);
 506
 507         # Close file for disabled_sids after writing.
 508         close(DISABLED_FILE);
 509
 510         # Call function to generate and write the used rulefiles file.
 511         &IDS::write_used_rulefiles_file(@enabled_rulefiles);
 512
 513         # Lock the webpage and print message.
 514         &working_notice("$Lang::tr{'ids apply ruleset changes'}");
 515
 516         # Call oinkmaster to alter the ruleset.
 517         &IDS::oinkmaster();
 518
 519         # Check if the IDS is running.
 520         if(&IDS::ids_is_running()) {
 521                 # Check if a restart of suricata is required.
 522                 if ($suricata_restart_required) {
 523                         # Call suricatactrl to perform the restart.
 524                         &IDS::call_suricatactrl("restart");
 525                 } else {
 526                         # Call suricatactrl to perform a reload.
 527                         &IDS::call_suricatactrl("reload");
 528                 }
 529         }
 530
 531         # Reload page.
 532         &reload();
 533
 534 # Download new ruleset.
 535 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'update ruleset'}) {
 536         # Check if the red device is active.
 537         unless (-e "${General::swroot}/red/active") {
 538                 $errormessage = "$Lang::tr{'could not download latest updates'} - $Lang::tr{'system is offline'}";
 539         }
 540
 541         # Check if enought free disk space is availabe.
 542         if(&IDS::checkdiskspace()) {
 543                 $errormessage = "$Lang::tr{'not enough disk space'}";
 544         }
 545
 546         # Check if any errors happend.
 547         unless ($errormessage) {
 548                 # Lock the webpage and print notice about downloading
 549                 # a new ruleset.
 550                 &working_notice("$Lang::tr{'ids download new ruleset'}");
 551
 552                 # Call subfunction to download the ruleset.
 553                 if(&IDS::downloadruleset()) {
 554                         $errormessage = $Lang::tr{'could not download latest updates'};
 555
 556                         # Call function to store the errormessage.
 557                         &IDS::_store_error_message($errormessage);
 558
 559                         # Preform a reload of the page.
 560                         &reload();
 561                 } else {
 562                         # Call subfunction to launch oinkmaster.
 563                         &IDS::oinkmaster();
 564
 565                         # Check if the IDS is running.
 566                         if(&IDS::ids_is_running()) {
 567                                 # Call suricatactrl to perform a reload.
 568                                 &IDS::call_suricatactrl("reload");
 569                         }
 570
 571                         # Perform a reload of the page.
 572                         &reload();
 573                 }
 574         }
 575 # Save IDS settings.
 576 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 577         my %oldidssettings;
 578         my $reload_page;
 579         my $monitored_zones = 0;
 580
 581         # Read-in current (old) IDS settings.
 582         &General::readhash("$IDS::ids_settings_file", \%oldidssettings);
 583
 584         # Prevent form name from been stored in conf file.
 585         delete $cgiparams{'IDS'};
 586
 587         # Check if the IDS should be enabled.
 588         if ($cgiparams{'ENABLE_IDS'} eq "on") {
 589                 # Check if any ruleset is available. Otherwise abort and display an error.
 590                 unless(%idsrules) {
 591                         $errormessage = $Lang::tr{'ids no ruleset available'};
 592                 }
 593
 594                 # Loop through the array of available interfaces.
 595                 foreach my $zone (@network_zones) {
 596                         # Convert interface name into upper case.
 597                         my $zone_upper = uc($zone);
 598
 599                         # Check if the IDS is enabled for this interaces.
 600                         if ($cgiparams{"ENABLE_IDS_$zone_upper"}) {
 601                                 # Increase count.
 602                                 $monitored_zones++;
 603                         }
 604                 }
 605
 606                 # Check if at least one zone should be monitored, or show an error.
 607                 unless ($monitored_zones >= 1) {
 608                         $errormessage = $Lang::tr{'ids no network zone'};
 609                 }
 610         }
 611
 612         # Go on if there are no error messages.
 613         if (!$errormessage) {
 614                 # Store settings into settings file.
 615                 &General::writehash("$IDS::ids_settings_file", \%cgiparams);
 616         }
 617
 618         # Generate file to store the home net.
 619         &IDS::generate_home_net_file();
 620
 621         # Generate file to the store the DNS servers.
 622         &IDS::generate_dns_servers_file();
 623
 624         # Generate file to store the HTTP ports.
 625         &IDS::generate_http_ports_file();
 626
 627         # Write the modify sid's file and pass the taken ruleaction.
 628         &IDS::write_modify_sids_file();
 629
 630         # Check if "MONITOR_TRAFFIC_ONLY" has been changed.
 631         if($cgiparams{'MONITOR_TRAFFIC_ONLY'} ne $oldidssettings{'MONITOR_TRAFFIC_ONLY'}) {
 632                 # Check if a ruleset exists.
 633                 if (%idsrules) {
 634                         # Lock the webpage and print message.
 635                         &working_notice("$Lang::tr{'ids working'}");
 636
 637                         # Call oinkmaster to alter the ruleset.
 638                         &IDS::oinkmaster();
 639
 640                         # Set reload_page to "True".
 641                         $reload_page="True";
 642                 }
 643         }
 644
 645         # Check if the IDS currently is running.
 646         if(&IDS::ids_is_running()) {
 647                 # Check if ENABLE_IDS is set to on.
 648                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 649                         # Call suricatactrl to perform a reload of suricata.
 650                         &IDS::call_suricatactrl("reload");
 651                 } else {
 652                         # Call suricatactrl to stop suricata.
 653                         &IDS::call_suricatactrl("stop");
 654                 }
 655         } else {
 656                 # Call suricatactrl to start suricata.
 657                 &IDS::call_suricatactrl("start");
 658         }
 659
 660         # Check if the page should be reloaded.
 661         if ($reload_page) {
 662                 # Perform a reload of the page.
 663                 &reload();
 664         }
 665 }
 666
 667 # Read-in idssettings and rulesetsettings
 668 &General::readhash("$IDS::ids_settings_file", \%idssettings);
 669 &General::readhash("$IDS::rules_settings_file", \%rulessettings);
 670
 671 # If no autoupdate intervall has been configured yet, set default value.
 672 unless(exists($rulessettings{'AUTOUPDATE_INTERVAL'})) {
 673         # Set default to "weekly".
 674         $rulessettings{'AUTOUPDATE_INTERVAL'} = 'weekly';
 675 }
 676
 677 # Read-in ignored hosts.
 678 &General::readhasharray("$IDS::settingsdir/ignored", \%ignored);
 679
 680 $checked{'ENABLE_IDS'}{'off'} = '';
 681 $checked{'ENABLE_IDS'}{'on'} = '';
 682 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 683 $checked{'MONITOR_TRAFFIC_ONLY'}{'off'} = '';
 684 $checked{'MONITOR_TRAFFIC_ONLY'}{'on'} = '';
 685 $checked{'MONITOR_TRAFFIC_ONLY'}{$idssettings{'MONITOR_TRAFFIC_ONLY'}} = "checked='checked'";
 686 $selected{'RULES'}{'nothing'} = '';
 687 $selected{'RULES'}{$rulessettings{'RULES'}} = "selected='selected'";
 688 $selected{'AUTOUPDATE_INTERVAL'}{'off'} = '';
 689 $selected{'AUTOUPDATE_INTERVAL'}{'daily'} = '';
 690 $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} = '';
 691 $selected{'AUTOUPDATE_INTERVAL'}{$rulessettings{'AUTOUPDATE_INTERVAL'}} = "selected='selected'";
 692
 693 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 694
 695 ### Java Script ###
 696 print"<script>\n";
 697
 698 # Java script variable declaration for show and hide.
 699 print"var show = \"$Lang::tr{'ids show'}\"\;\n";
 700 print"var hide = \"$Lang::tr{'ids hide'}\"\;\n";
 701
 702 print <<END
 703         // Java Script function to show/hide the text input field for
 704         // Oinkcode/Subscription code.
 705         var update_code = function() {
 706                 if(\$('#RULES').val() == 'registered') {
 707                         \$('#code').show();
 708                 } else if(\$('#RULES').val() == 'subscripted') {
 709                         \$('#code').show();
 710                 } else if(\$('#RULES').val() == 'emerging_pro') {
 711                         \$('#code').show();
 712                 } else {
 713                         \$('#code').hide();
 714                 }
 715         };
 716
 717         // JQuery function to call corresponding function when
 718         // the ruleset is changed or the page is loaded for showing/hiding
 719         // the code area.
 720         \$(document).ready(function() {
 721                 \$('#RULES').change(update_code);
 722                 update_code();
 723         });
 724
 725         // Tiny java script function to show/hide the rules
 726         // of a given category.
 727         function showhide(tblname) {
 728                 \$("#" + tblname).toggle();
 729
 730                 // Get current content of the span element.
 731                 var content = document.getElementById("span_" + tblname);
 732
 733                 if (content.innerHTML === show) {
 734                         content.innerHTML = hide;
 735                 } else {
 736                         content.innerHTML = show;
 737                 }
 738         }
 739 </script>
 740 END
 741 ;
 742
 743 &Header::openbigbox('100%', 'left', '', $errormessage);
 744
 745 if ($errormessage) {
 746         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 747         print "<class name='base'>$errormessage\n";
 748         print "&nbsp;</class>\n";
 749         &Header::closebox();
 750 }
 751
 752 # Draw current state of the IDS
 753 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 754
 755 # Check if the IDS is running and obtain the process-id.
 756 my $pid = &IDS::ids_is_running();
 757
 758 # Display some useful information, if suricata daemon is running.
 759 if ($pid) {
 760         # Gather used memory.
 761         my $memory = &get_memory_usage($pid);
 762
 763         print <<END;
 764                 <table width='95%' cellspacing='0' class='tbl'>
 765                         <tr>
 766                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 767                         </tr>
 768
 769                         <tr>
 770                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 771                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 772                         </tr>
 773
 774                         <tr>
 775                                 <td class='base'></td>
 776                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 777                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 778                         </tr>
 779
 780                         <tr>
 781                                 <td class='base'></td>
 782                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 783                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 784                         </tr>
 785                 </table>
 786 END
 787 } else {
 788         # Otherwise display a hint that the service is not launched.
 789         print <<END;
 790                 <table width='95%' cellspacing='0' class='tbl'>
 791                         <tr>
 792                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 793                         </tr>
 794
 795                         <tr>
 796                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 797                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 798                         </tr>
 799                 </table>
 800 END
 801 }
 802
 803 # Only show this area, if a ruleset is present.
 804 if (%idsrules) {
 805
 806         print <<END
 807
 808         <br><br><h2>$Lang::tr{'settings'}</h2>
 809
 810         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 811                 <table width='100%' border='0'>
 812                         <tr>
 813                                 <td class='base' colspan='2'>
 814                                         <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>&nbsp;$Lang::tr{'ids enable'}
 815                                 </td>
 816
 817                                 <td class='base' colspan='2'>
 818                                         <input type='checkbox' name='MONITOR_TRAFFIC_ONLY' $checked{'MONITOR_TRAFFIC_ONLY'}{'on'}>&nbsp;$Lang::tr{'ids monitor traffic only'}
 819                         </td>
 820                         </tr>
 821
 822                         <tr>
 823                                 <td><br><br></td>
 824                                 <td><br><br></td>
 825                                 <td><br><br></td>
 826                                 <td><br><br></td>
 827                         </tr>
 828
 829                         <tr>
 830                                 <td colspan='4'><b>$Lang::tr{'ids monitored interfaces'}</b><br></td>
 831                         </tr>
 832
 833                         <tr>
 834 END
 835 ;
 836
 837         # Loop through the array of available networks and print config options.
 838         foreach my $zone (@network_zones) {
 839                 my $checked_input;
 840                 my $checked_forward;
 841
 842                 # Convert current zone name to upper case.
 843                 my $zone_upper = uc($zone);
 844
 845                 # Set zone name.
 846                 my $zone_name = $zone;
 847
 848                 # Dirty hack to get the correct language string for the red zone.
 849                 if ($zone eq "red") {
 850                         $zone_name = "red1";
 851                 }
 852
 853                 # Grab checkbox status from settings hash.
 854                 if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 855                         $checked_input = "checked = 'checked'";
 856                 }
 857
 858                 print "<td class='base' width='20%'>\n";
 859                 print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>\n";
 860                 print "&nbsp;$Lang::tr{'enabled on'}<font color='$colourhash{$zone}'> $Lang::tr{$zone_name}</font>\n";
 861                 print "</td>\n";
 862         }
 863
 864 print <<END
 865                         </tr>
 866                 </table>
 867
 868                 <br><br>
 869
 870                 <table width='100%'>
 871                         <tr>
 872                                 <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 873                         </tr>
 874                 </table>
 875         </form>
 876 END
 877 ;
 878
 879 }
 880
 881 &Header::closebox();
 882
 883 # Draw elements for ruleset configuration.
 884 &Header::openbox('100%', 'center', $Lang::tr{'ids ruleset settings'});
 885
 886 print <<END
 887 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 888         <table width='100%' border='0'>
 889                 <tr>
 890                         <td><b>$Lang::tr{'ids rules update'}</b></td>
 891                         <td><b>$Lang::tr{'ids automatic rules update'}</b></td>
 892                 </tr>
 893
 894                 <tr>
 895                         <td><select name='RULES' id='RULES'>
 896 END
 897 ;
 898                         # Get all available ruleset providers.
 899                         my @ruleset_providers = &IDS::get_ruleset_providers();
 900
 901                         # Loop throgh the list of providers.
 902                         foreach my $provider (@ruleset_providers) {
 903                                 # Call get_provider_name function to obtain the provider name.
 904                                 my $option_string = &get_provider_name($provider);
 905
 906                                 # Print option.
 907                                 print "<option value='$provider' $selected{'RULES'}{$provider}>$option_string</option>\n";
 908                         }
 909 print <<END;
 910                         </select>
 911                         </td>
 912
 913                         <td>
 914                                 <select name='AUTOUPDATE_INTERVAL'>
 915                                         <option value='off' $selected{'AUTOUPDATE_INTERVAL'}{'off'} >- $Lang::tr{'Disabled'} -</option>
 916                                         <option value='daily' $selected{'AUTOUPDATE_INTERVAL'}{'daily'} >$Lang::tr{'Daily'}</option>
 917                                         <option value='weekly' $selected{'AUTOUPDATE_INTERVAL'}{'weekly'} >$Lang::tr{'Weekly'}</option>
 918                                 </select>
 919                         </td>
 920                 </tr>
 921
 922                 <tr>
 923                         <td colspan='2'><br><br></td>
 924                 </tr>
 925
 926                 <tr style='display:none' id='code'>
 927                         <td colspan='2'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$rulessettings{'OINKCODE'}'></td>
 928                 </tr>
 929
 930                 <tr>
 931                         <td>&nbsp;</td>
 932
 933                         <td align='right'>
 934 END
 935 ;
 936                         # Show the "Update Ruleset"-Button only if a ruleset has been downloaded yet and automatic updates are disabled.
 937                         if ((%idsrules) && ($rulessettings{'AUTOUPDATE_INTERVAL'} eq "off")) {
 938                                 # Display button to update the ruleset.
 939                                 print"<input type='submit' name='RULESET' value='$Lang::tr{'update ruleset'}'>\n";
 940                 }
 941 print <<END;
 942                                 <input type='submit' name='RULESET' value='$Lang::tr{'ids customize ruleset'}'>
 943                                 <input type='submit' name='RULESET' value='$Lang::tr{'save'}'>
 944                         </td>
 945
 946                 </tr>
 947         </table>
 948 </form>
 949 END
 950 ;
 951
 952 &Header::closebox();
 953
 954 #
 955 # Whitelist / Ignorelist
 956 #
 957 &Header::openbox('100%', 'center', $Lang::tr{'ids ignored hosts'});
 958
 959 print <<END;
 960         <table width='100%'>
 961                 <tr>
 962                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'ip address'}</b></td>
 963                         <td class='base' bgcolor='$color{'color20'}'><b>$Lang::tr{'remark'}</b></td>
 964                         <td class='base' colspan='3' bgcolor='$color{'color20'}'></td>
 965                 </tr>
 966 END
 967                 # Check if some hosts have been added to be ignored.
 968                 if (keys (%ignored)) {
 969                         my $col = "";
 970
 971                         # Loop through all entries of the hash.
 972                         while( (my $key) = each %ignored)  {
 973                                 # Assign data array positions to some nice variable names.
 974                                 my $address = $ignored{$key}[0];
 975                                 my $remark = $ignored{$key}[1];
 976                                 my $status  = $ignored{$key}[2];
 977
 978                                 # Check if the key (id) number is even or not.
 979                                 if ($cgiparams{'ID'} eq $key) {
 980                                         $col="bgcolor='${Header::colouryellow}'";
 981                                 } elsif ($key % 2) {
 982                                         $col="bgcolor='$color{'color22'}'";
 983                                 } else {
 984                                         $col="bgcolor='$color{'color20'}'";
 985                                 }
 986
 987                                 # Choose icon for the checkbox.
 988                                 my $gif;
 989                                 my $gdesc;
 990
 991                                 # Check if the status is enabled and select the correct image and description.
 992                                 if ($status eq 'enabled' ) {
 993                                         $gif = 'on.gif';
 994                                         $gdesc = $Lang::tr{'click to disable'};
 995                                 } else {
 996                                         $gif = 'off.gif';
 997                                         $gdesc = $Lang::tr{'click to enable'};
 998                                 }
 999
1000 print <<END;
1001                                 <tr>
1002                                         <td width='20%' class='base' $col>$address</td>
1003                                         <td width='65%' class='base' $col>$remark</td>
1004
1005                                         <td align='center' $col>
1006                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1007                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'toggle enable disable'}' />
1008                                                         <input type='image' name='$Lang::tr{'toggle enable disable'}' src='/images/$gif' alt='$gdesc' title='$gdesc' />
1009                                                         <input type='hidden' name='ID' value='$key' />
1010                                                 </form>
1011                                         </td>
1012
1013                                         <td align='center' $col>
1014                                                 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1015                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'edit'}' />
1016                                                         <input type='image' name='$Lang::tr{'edit'}' src='/images/edit.gif' alt='$Lang::tr{'edit'}' title='$Lang::tr{'edit'}' />
1017                                                         <input type='hidden' name='ID' value='$key' />
1018                                                 </form>
1019                                         </td>
1020
1021                                         <td align='center' $col>
1022                                                 <form method='post' name='$key' action='$ENV{'SCRIPT_NAME'}'>
1023                                                         <input type='image' name='$Lang::tr{'remove'}' src='/images/delete.gif' title='$Lang::tr{'remove'}' alt='$Lang::tr{'remove'}'>
1024                                                         <input type='hidden' name='ID' value='$key'>
1025                                                         <input type='hidden' name='WHITELIST' value='$Lang::tr{'remove'}'>
1026                                                 </form>
1027                                         </td>
1028                                 </tr>
1029 END
1030                         }
1031                 } else {
1032                         # Print notice that currently no hosts are ignored.
1033                         print "<tr>\n";
1034                         print "<td class='base' colspan='2'>$Lang::tr{'guardian no entries'}</td>\n";
1035                         print "</tr>\n";
1036                 }
1037
1038         print "</table>\n";
1039
1040         # Section to add new elements or edit existing ones.
1041 print <<END;
1042         <br>
1043         <hr>
1044         <br>
1045
1046         <div align='center'>
1047                 <table width='100%'>
1048 END
1049
1050         # Assign correct headline and button text.
1051         my $buttontext;
1052         my $entry_address;
1053         my $entry_remark;
1054
1055         # Check if an ID (key) has been given, in this case an existing entry should be edited.
1056         if ($cgiparams{'ID'} ne '') {
1057                 $buttontext = $Lang::tr{'update'};
1058                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'update'}</b></td></tr>\n";
1059
1060                         # Grab address and remark for the given key.
1061                         $entry_address = $ignored{$cgiparams{'ID'}}[0];
1062                         $entry_remark = $ignored{$cgiparams{'ID'}}[1];
1063                 } else {
1064                         $buttontext = $Lang::tr{'add'};
1065                         print "<tr><td class='boldbase' colspan='3'><b>$Lang::tr{'dnsforward add a new entry'}</b></td></tr>\n";
1066                 }
1067
1068 print <<END;
1069                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
1070                         <input type='hidden' name='ID' value='$cgiparams{'ID'}'>
1071                         <tr>
1072                                 <td width='30%'>$Lang::tr{'ip address'}: </td>
1073                                 <td width='50%'><input type='text' name='IGNORE_ENTRY_ADDRESS' value='$entry_address' size='24' /></td>
1074
1075                                 <td width='30%'>$Lang::tr{'remark'}: </td>
1076                                 <td wicth='50%'><input type='text' name=IGNORE_ENTRY_REMARK value='$entry_remark' size='24' /></td>
1077                                 <td align='center' width='20%'><input type='submit' name='WHITELIST' value='$buttontext' /></td>
1078                         </tr>
1079                         </form>
1080                 </table>
1081         </div>
1082 END
1083
1084 &Header::closebox();
1085
1086 # Only show the section for configuring the ruleset if one is present.
1087 if (%idsrules) {
1088         &show_customize_ruleset();
1089 }
1090
1091 &Header::closebigbox();
1092 &Header::closepage();
1093
1094 #
1095 ## Function to show the customize ruleset section.
1096 #
1097 sub show_customize_ruleset() {
1098         # Load neccessary perl modules for file stat and to format the timestamp.
1099         use File::stat;
1100         use POSIX qw( strftime );
1101
1102         # Call stat on the rulestarball.
1103         my $stat = stat("$IDS::rulestarball");
1104
1105         if (defined $stat) {
1106                 # Get timestamp the file creation.
1107                 my $mtime = $stat->mtime;
1108
1109                 # Convert into human read-able format.
1110                 my $rulesdate = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime));
1111
1112                 &Header::openbox('100%', 'LEFT', "$Lang::tr{'intrusion detection system rules'} ($rulesdate)" );
1113
1114                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
1115
1116                 # Output display table for rule files
1117                 print "<table width='100%'>\n";
1118
1119                 # Loop over each rule file
1120                 foreach my $rulefile (sort keys(%idsrules)) {
1121                         my $rulechecked = '';
1122
1123                         # Check if rule file is enabled
1124                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
1125                                 $rulechecked = 'CHECKED';
1126                         }
1127
1128                         # Convert rulefile name into category name.
1129                         my $categoryname = &_rulefile_to_category($rulefile);
1130
1131                         # Table and rows for the rule files.
1132                         print"<tr>\n";
1133                         print"<td class='base' width='5%'>\n";
1134                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
1135                         print"</td>\n";
1136                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
1137                         print"<td class='base' width='5%' align='right'>\n";
1138                         print"<a href=\"javascript:showhide('$categoryname')\"><span id='span_$categoryname'>$Lang::tr{'ids show'}</span></a>\n";
1139                         print"</td>\n";
1140                         print"</tr>\n";
1141
1142                         # Rows which will be hidden per default and will contain the single rules.
1143                         print"<tr  style='display:none' id='$categoryname'>\n";
1144                         print"<td colspan='3'>\n";
1145
1146                         # Local vars
1147                         my $lines;
1148                         my $rows;
1149                         my $col;
1150
1151                         # New table for the single rules.
1152                         print "<table width='100%'>\n";
1153
1154                         # Loop over rule file rules
1155                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
1156                                 # Local vars
1157                                 my $ruledefchecked = '';
1158
1159                                 # Skip rulefile itself.
1160                                 next if ($sid eq "Rulefile");
1161
1162                                 # If 2 rules have been displayed, start a new row
1163                                 if (($lines % 2) == 0) {
1164                                         print "</tr><tr>\n";
1165
1166                                         # Increase rows by once.
1167                                         $rows++;
1168                                 }
1169
1170                                 # Colour lines.
1171                                 if ($rows % 2) {
1172                                         $col="bgcolor='$color{'color20'}'";
1173                                 } else {
1174                                         $col="bgcolor='$color{'color22'}'";
1175                                 }
1176
1177                                 # Set rule state
1178                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
1179                                         $ruledefchecked = 'CHECKED';
1180                                 }
1181
1182                                 # Create rule checkbox and display rule description
1183                                 print "<td class='base' width='5%' align='right' $col>\n";
1184                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
1185                                 print "</td>\n";
1186                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
1187
1188                                 # Increment rule count
1189                                 $lines++;
1190                         }
1191
1192                         # If do not have a second rule for row, create empty cell
1193                         if (($lines % 2) != 0) {
1194                                 print "<td class='base'></td>";
1195                         }
1196
1197                         # Close display table
1198                         print "</tr></table></td></tr>";
1199                 }
1200
1201                 # Close display table
1202                 print "</table>";
1203
1204                 print <<END
1205 <table width='100%'>
1206 <tr>
1207         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'ids apply'}'></td>
1208 </tr>
1209 </table>
1210 </form>
1211 END
1212 ;
1213                 &Header::closebox();
1214         }
1215 }
1216
1217 #
1218 ## A function to display a notice, to lock the webpage and
1219 ## tell the user which action currently will be performed.
1220 #
1221 sub working_notice ($) {
1222         my ($message) = @_;
1223
1224         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
1225         &Header::openbigbox('100%', 'left', '', $errormessage);
1226         &Header::openbox( 'Waiting', 1,);
1227                 print <<END;
1228                         <table>
1229                                 <tr>
1230                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
1231                                         <td>$message</td>
1232                                 </tr>
1233                         </table>
1234 END
1235         &Header::closebox();
1236         &Header::closebigbox();
1237         &Header::closepage();
1238 }
1239
1240 #
1241 ## A tiny function to perform a reload of the webpage after one second.
1242 #
1243 sub reload () {
1244         print "<meta http-equiv='refresh' content='1'>\n";
1245
1246         # Stop the script.
1247         exit;
1248 }
1249
1250 #
1251 ## Private function to read-in and parse rules of a given rulefile.
1252 #
1253 ## The given file will be read, parsed and all valid rules will be stored by ID,
1254 ## message/description and it's state in the idsrules hash.
1255 #
1256 sub readrulesfile ($) {
1257         my $rulefile = shift;
1258
1259         # Open rule file and read in contents
1260         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
1261
1262         # Store file content in an array.
1263         my @lines = <RULEFILE>;
1264
1265         # Close file.
1266         close(RULEFILE);
1267
1268         # Loop over rule file contents
1269         foreach my $line (@lines) {
1270                 # Remove whitespaces.
1271                 chomp $line;
1272
1273                 # Skip blank  lines.
1274                 next if ($line =~ /^\s*$/);
1275
1276                 # Local vars.
1277                 my $sid;
1278                 my $msg;
1279
1280                 # Gather rule sid and message from the ruleline.
1281                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
1282                         $msg = $1;
1283                         $sid = $2;
1284
1285                         # Check if a rule has been found.
1286                         if ($sid && $msg) {
1287                                 # Add rule to the idsrules hash.
1288                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
1289
1290                                 # Grab status of the rule. Check if ruleline starts with a "dash".
1291                                 if ($line =~ /^\#/) {
1292                                         # If yes, the rule is disabled.
1293                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
1294                                 } else {
1295                                         # Otherwise the rule is enabled.
1296                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
1297                                 }
1298                         }
1299                 }
1300         }
1301 }
1302
1303 #
1304 ## Function to get the used memory of a given process-id.
1305 #
1306 sub get_memory_usage($) {
1307         my ($pid) = @_;
1308
1309         my $memory = 0;
1310
1311         # Try to open the status file for the given process-id on the pseudo
1312         # file system proc.
1313         if (open(FILE, "/proc/$pid/status")) {
1314                 # Loop through the entire file.
1315                 while (<FILE>) {
1316                         # Splitt current line content and store them into variables.
1317                         my ($key, $value) = split(":", $_, 2);
1318
1319                         # Check if the current key is the one which contains the memory usage.
1320                         # The wanted one is VmRSS which contains the Real-memory (resident set)
1321                         # of the entire process.
1322                         if ($key eq "VmRSS") {
1323                                 # Found the memory usage add it to the memory variable.
1324                                 $memory += $value;
1325
1326                                 # Break the loop.
1327                                 last;
1328                         }
1329                 }
1330
1331                 # Close file handle.
1332                 close(FILE);
1333
1334                 # Return memory usage.
1335                 return $memory;
1336         }
1337
1338         # If the file could not be open, return nothing.
1339         return;
1340 }
1341
1342 #
1343 ## Function to read-in the given enabled or disables sids file.
1344 #
1345 sub read_enabled_disabled_sids_file($) {
1346         my ($file) = @_;
1347
1348         # Temporary hash to store the sids and their state. It will be
1349         # returned at the end of this function.
1350         my %temphash;
1351
1352         # Open the given filename.
1353         open(FILE, "$file") or die "Could not open $file. $!\n";
1354
1355         # Loop through the file.
1356         while(<FILE>) {
1357                 # Remove newlines.
1358                 chomp $_;
1359
1360                 # Skip blank lines.
1361                 next if ($_ =~ /^\s*$/);
1362
1363                 # Skip coments.
1364                 next if ($_ =~ /^\#/);
1365
1366                 # Splitt line into sid and state part.
1367                 my ($state, $sid) = split(" ", $_);
1368
1369                 # Skip line if the sid is not numeric.
1370                 next unless ($sid =~ /\d+/ );
1371
1372                 # Check if the sid was enabled.
1373                 if ($state eq "enablesid") {
1374                         # Add the sid and its state as enabled to the temporary hash.
1375                         $temphash{$sid} = "enabled";
1376                 # Check if the sid was disabled.
1377                 } elsif ($state eq "disablesid") {
1378                         # Add the sid and its state as disabled to the temporary hash.
1379                         $temphash{$sid} = "disabled";
1380                 # Invalid state - skip the current sid and state.
1381                 } else {
1382                         next;
1383                 }
1384         }
1385
1386         # Close filehandle.
1387         close(FILE);
1388
1389         # Return the hash.
1390         return %temphash;
1391 }
1392
1393 #
1394 ## Function to get the provider name from the language file or providers file for a given handle.
1395 #
1396 sub get_provider_name($) {
1397         my ($handle) = @_;
1398         my $provider_name;
1399
1400         # Get the required translation string for the given provider handle.
1401         my $tr_string = $IDS::Ruleset::Providers{$handle}{'tr_string'};
1402
1403         # Check if the translation string is available in the language files.
1404         if ($Lang::tr{$tr_string}) {
1405                 # Use the translated string from the language file.
1406                 $provider_name = $Lang::tr{$tr_string};
1407         } else {
1408                 # Fallback and use the provider summary from the providers file.
1409                 $provider_name = $IDS::Ruleset::Providers{$handle}{'summary'};
1410         }
1411
1412         # Return the obtained provider name.
1413         return $provider_name;
1414 }
1415
1416 #
1417 ## Private function to convert a given rulefile to a category name.
1418 ## ( No file extension anymore and if the name contained a dot, it
1419 ## would be replaced by a underline sign.)
1420 #
1421 sub _rulefile_to_category($) {
1422         my ($filename) = @_;
1423
1424         # Splitt the filename into single chunks and store them in a
1425         # temorary array.
1426         my @parts = split(/\./, $filename);
1427
1428         # Return / Remove last element of the temporary array.
1429         # This removes the file extension.
1430         pop @parts;
1431
1432         # Join together the single elements of the temporary array.
1433         # If these are more than one, use a "underline" for joining.
1434         my $category = join '_', @parts;
1435
1436         # Return the converted filename.
1437         return $category;
1438 }