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 "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %idsrules = ();
  36 my %idssettings=();
  37 my %rulesetsources = ();
  38 my %cgiparams=();
  39 my %checked=();
  40 my %selected=();
  41
  42 # Read-in main settings, for language, theme and colors.
  43 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  44 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  45
  46 # Get the available network zones, based on the config type of the system and store
  47 # the list of zones in an array.
  48 my @network_zones = &IDS::get_available_network_zones();
  49
  50 # File where the used rulefiles are stored.
  51 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
  52
  53 # File where the addresses of the homenet are stored.
  54 my $idshomenetfile = "$IDS::settingsdir/suricata-homenet.yaml";
  55
  56 # File which contains the enabled sids.
  57 my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
  58
  59 # File which contains the disabled sids.
  60 my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
  61
  62 # File which contains wheater the rules should be changed.
  63 my $modify_sids_file = "$IDS::settingsdir/oinkmaster-modify-sids.conf";
  64
  65 my $errormessage;
  66
  67 # Create files if they does not exist yet.
  68 unless (-f "$enabled_sids_file") { &IDS::create_empty_file($enabled_sids_file); }
  69 unless (-f "$disabled_sids_file") { &IDS::create_empty_file($disabled_sids_file); }
  70 unless (-f "$modify_sids_file") { &IDS::create_empty_file($modify_sids_file); }
  71 unless (-f "$idsusedrulefilesfile") { &IDS::create_empty_file($idsusedrulefilesfile); }
  72
  73 &Header::showhttpheaders();
  74
  75 #Get GUI values
  76 &Header::getcgihash(\%cgiparams);
  77
  78 # Check if any error has been stored.
  79 if (-e $IDS::storederrorfile) {
  80         # Open file to read in the stored error message.
  81         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
  82
  83         # Read the stored error message.
  84         $errormessage = <FILE>;
  85
  86         # Close file.
  87         close (FILE);
  88
  89         # Delete the file, which is now not longer required.
  90         unlink($IDS::storederrorfile);
  91 }
  92
  93
  94 ## Grab all available snort rules and store them in the idsrules hash.
  95 #
  96 # Open snort rules directory and do a directory listing.
  97 opendir(DIR, $IDS::rulespath) or die $!;
  98         # Loop through the direcory.
  99         while (my $file = readdir(DIR)) {
 100
 101                 # We only want files.
 102                 next unless (-f "$IDS::rulespath/$file");
 103
 104                 # Ignore empty files.
 105                 next if (-z "$IDS::rulespath/$file");
 106
 107                 # Use a regular expression to find files ending in .rules
 108                 next unless ($file =~ m/\.rules$/);
 109
 110                 # Ignore files which are not read-able.
 111                 next unless (-R "$IDS::rulespath/$file");
 112
 113                 # Call subfunction to read-in rulefile and add rules to
 114                 # the idsrules hash.
 115                 &readrulesfile("$file");
 116         }
 117
 118 closedir(DIR);
 119
 120 # Gather used rulefiles.
 121 #
 122 # Check if the file for activated rulefiles is not empty.
 123 if(-f $idsusedrulefilesfile) {
 124         # Open the file for used rulefile and read-in content.
 125         open(FILE, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\n";
 126
 127         # Read-in content.
 128         my @lines = <FILE>;
 129
 130         # Close file.
 131         close(FILE);
 132
 133         # Loop through the array.
 134         foreach my $line (@lines) {
 135                 # Remove newlines.
 136                 chomp($line);
 137
 138                 # Skip comments.
 139                 next if ($line =~ /\#/);
 140
 141                 # Skip blank  lines.
 142                 next if ($line =~ /^\s*$/);
 143
 144                 # Gather rule sid and message from the ruleline.
 145                 if ($line =~ /.*- (.*)/) {
 146                         my $rulefile = $1;
 147
 148                         # Add the rulefile to the %idsrules hash.
 149                         $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 150                 }
 151         }
 152 }
 153
 154 # Save ruleset.
 155 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 156         # Arrays to store which rulefiles have been enabled and will be used.
 157         my @enabled_rulefiles;
 158
 159         # Hash to store the user-enabled and disabled sids.
 160         my %enabled_disabled_sids;
 161
 162         # Loop through the hash of idsrules.
 163         foreach my $rulefile(keys %idsrules) {
 164                 # Check if the rulefile is enabled.
 165                 if ($cgiparams{$rulefile} eq "on") {
 166                         # Add rulefile to the array of enabled rulefiles.
 167                         push(@enabled_rulefiles, $rulefile);
 168
 169                         # Drop item from cgiparams hash.
 170                         delete $cgiparams{$rulefile};
 171                 }
 172         }
 173
 174         # Read-in the files for enabled/disabled sids.
 175         # This will be done by calling the read_enabled_disabled_sids_file function two times
 176         # and merge the returned hashes together into the enabled_disabled_sids hash.
 177         %enabled_disabled_sids = (
 178                 &read_enabled_disabled_sids_file($disabled_sids_file),
 179                 &read_enabled_disabled_sids_file($enabled_sids_file));
 180
 181         # Loop through the hash of idsrules.
 182         foreach my $rulefile (keys %idsrules) {
 183                 # Loop through the single rules of the rulefile.
 184                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 185                         # Skip the current sid if it is not numeric.
 186                         next unless ($sid =~ /\d+/ );
 187
 188                         # Check if there exists a key in the cgiparams hash for this sid.
 189                         if (exists($cgiparams{$sid})) {
 190                                 # Look if the rule is disabled.
 191                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 192                                         # Check if the state has been set to 'on'.
 193                                         if ($cgiparams{$sid} eq "on") {
 194                                                 # Add/Modify the sid to/in the enabled_disabled_sids hash.
 195                                                 $enabled_disabled_sids{$sid} = "enabled";
 196
 197                                                 # Drop item from cgiparams hash.
 198                                                 delete $cgiparams{$rulefile}{$sid};
 199                                         }
 200                                 }
 201                         } else {
 202                                 # Look if the rule is enabled.
 203                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 204                                         # Check if the state is 'on' and should be disabled.
 205                                         # In this case there is no entry
 206                                         # for the sid in the cgiparams hash.
 207                                         # Add/Modify it to/in the enabled_disabled_sids hash.
 208                                         $enabled_disabled_sids{$sid} = "disabled";
 209
 210                                         # Drop item from cgiparams hash.
 211                                         delete $cgiparams{$rulefile}{$sid};
 212                                 }
 213                         }
 214                 }
 215         }
 216
 217         # Open enabled sid's file for writing.
 218         open(ENABLED_FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 219
 220         # Open disabled sid's file for writing.
 221         open(DISABLED_FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 222
 223         # Write header to the files.
 224         print ENABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 225         print DISABLED_FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 226
 227         # Check if the hash for enabled/disabled files contains any entries.
 228         if (%enabled_disabled_sids) {
 229                 # Loop through the hash.
 230                 foreach my $sid (keys %enabled_disabled_sids) {
 231                         # Check if the sid is enabled.
 232                         if ($enabled_disabled_sids{$sid} eq "enabled") {
 233                                 # Print the sid to the enabled_sids file.
 234                                 print ENABLED_FILE "enablesid $sid\n";
 235                         # Check if the sid is disabled.
 236                         } elsif ($enabled_disabled_sids{$sid} eq "disabled") {
 237                                 # Print the sid to the disabled_sids file.
 238                                 print DISABLED_FILE "disablesid $sid\n";
 239                         # Something strange happende - skip the current sid.
 240                         } else {
 241                                 next;
 242                         }
 243                 }
 244         }
 245
 246         # Close file for enabled_sids after writing.
 247         close(ENABLED_FILE);
 248
 249         # Close file for disabled_sids after writing.
 250         close(DISABLED_FILE);
 251
 252         # Open file for used rulefiles.
 253         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 254
 255         # Write yaml header to the file.
 256         print FILE "%YAML 1.1\n";
 257         print FILE "---\n\n";
 258
 259         # Write header to file.
 260         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 261
 262         # Check if the enabled_rulefiles array contains any entries.
 263         if (@enabled_rulefiles) {
 264                 # Loop through the array of rulefiles which should be loaded and write the to the file.
 265                 foreach my $file (@enabled_rulefiles) {
 266                         print FILE " - $file\n";
 267                 }
 268         }
 269
 270         # Close file after writing.
 271         close(FILE);
 272
 273         # Lock the webpage and print message.
 274         &working_notice("$Lang::tr{'snort working'}");
 275
 276         # Call oinkmaster to alter the ruleset.
 277         &IDS::oinkmaster();
 278
 279         # Check if the IDS is running.
 280         if(&IDS::ids_is_running()) {
 281                 # Call suricatactrl to perform a reload.
 282                 &IDS::call_suricatactrl("reload");
 283         }
 284
 285         # Reload page.
 286         &reload();
 287
 288 # Download new ruleset.
 289 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 290         # Check if the red device is active.
 291         unless (-e "${General::swroot}/red/active") {
 292                 $errormessage = $Lang::tr{'could not download latest updates'};
 293         }
 294
 295         # Check if enought free disk space is availabe.
 296         if(&IDS::checkdiskspace()) {
 297                 $errormessage = "$Lang::tr{'not enough disk space'}";
 298         }
 299
 300         # Check if any errors happend.
 301         unless ($errormessage) {
 302                 # Lock the webpage and print notice about downloading
 303                 # a new ruleset.
 304                 &working_notice("$Lang::tr{'snort working'}");
 305
 306                 # Call subfunction to download the ruleset.
 307                 if(&IDS::downloadruleset()) {
 308                         $errormessage = $Lang::tr{'could not download latest updates'};
 309
 310                         # Call function to store the errormessage.
 311                         &IDS::_store_error_message($errormessage);
 312
 313                         # Preform a reload of the page.
 314                         &reload();
 315                 } else {
 316                         # Call subfunction to launch oinkmaster.
 317                         &IDS::oinkmaster();
 318
 319                         # Check if the IDS is running.
 320                         if(&IDS::ids_is_running()) {
 321                                 # Call suricatactrl to perform a reload.
 322                                 &IDS::call_suricatactrl("reload");
 323                         }
 324
 325                         # Perform a reload of the page.
 326                         &reload();
 327                 }
 328         }
 329 # Save snort settings.
 330 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 331         my %oldidssettings;
 332         my $reload_page;
 333
 334         # Read-in current (old) IDS settings.
 335         &General::readhash("$IDS::settingsdir/settings", \%oldidssettings);
 336
 337         # Prevent form name from been stored in conf file.
 338         delete $cgiparams{'IDS'};
 339
 340         # Check if an oinkcode has been provided.
 341         if ($cgiparams{'OINKCODE'}) {
 342                 # Check if the oinkcode contains unallowed chars.
 343                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 344                         $errormessage = $Lang::tr{'invalid input for oink code'};
 345                 }
 346         }
 347
 348         # Go on if there are no error messages.
 349         if (!$errormessage) {
 350                 # Store settings into settings file.
 351                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 352         }
 353
 354         # Generate file to store the home net.
 355         &generate_home_net_file();
 356
 357         # Open modify sid's file for writing.
 358         open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
 359
 360         # Write file header.
 361         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 362
 363         # Check if the configured runmode is IPS.
 364         if ($cgiparams{'RUN_MODE'} eq 'IPS') {
 365                 # Tell oinkmaster to switch all rules from alert to drop.
 366                 print FILE "modifysid \* \"alert\" \| \"drop\"\n";
 367         }
 368
 369         # Close file handle.
 370         close(FILE);
 371
 372         # Check if the runmode has been changed.
 373         if($cgiparams{'RUN_MODE'} ne $oldidssettings{'RUN_MODE'}) {
 374                 # Check if a ruleset exists.
 375                 if (%idsrules) {
 376                         # Lock the webpage and print message.
 377                         &working_notice("$Lang::tr{'snort working'}");
 378
 379                         # Call oinkmaster to alter the ruleset.
 380                         &IDS::oinkmaster();
 381
 382                         # Set reload_page to "True".
 383                         $reload_page="True";
 384                 }
 385         }
 386
 387         # Check if the IDS currently is running.
 388         if(&IDS::ids_is_running()) {
 389                 # Check if ENABLE_IDS is set to on.
 390                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 391                         # Call suricatactrl to perform a reload of suricata.
 392                         &IDS::call_suricatactrl("reload");
 393                 } else {
 394                         # Call suricatactrl to stop suricata.
 395                         &IDS::call_suricatactrl("stop");
 396                 }
 397         } else {
 398                 # Call suricatactrl to start suricata.
 399                 &IDS::call_suricatactrl("start");
 400         }
 401
 402         # Check if the page should be reloaded.
 403         if ($reload_page) {
 404                 # Perform a reload of the page.
 405                 &reload();
 406         }
 407 }
 408
 409 # Read-in idssettings
 410 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 411
 412 # If the runmode has not been configured yet, set default value.
 413 unless(exists($idssettings{'RUN_MODE'})) {
 414         # Set default to IPS.
 415         $idssettings{'RUN_MODE'} = 'IPS';
 416 }
 417
 418 $checked{'ENABLE_IDS'}{'off'} = '';
 419 $checked{'ENABLE_IDS'}{'on'} = '';
 420 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 421 $checked{'RUN_MODE'}{'IDS'} = '';
 422 $checked{'RUN_MODE'}{'IPS'} = '';
 423 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
 424 $selected{'RULES'}{'nothing'} = '';
 425 $selected{'RULES'}{'community'} = '';
 426 $selected{'RULES'}{'emerging'} = '';
 427 $selected{'RULES'}{'registered'} = '';
 428 $selected{'RULES'}{'subscripted'} = '';
 429 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 430
 431 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 432
 433 ### Java Script ###
 434 print <<END
 435 <script>
 436         // Tiny java script function to show/hide the rules
 437         // of a given category.
 438         function showhide(tblname) {
 439                 \$("#" + tblname).toggle();
 440         }
 441 </script>
 442 END
 443 ;
 444
 445 &Header::openbigbox('100%', 'left', '', $errormessage);
 446
 447 if ($errormessage) {
 448         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 449         print "<class name='base'>$errormessage\n";
 450         print "&nbsp;</class>\n";
 451         &Header::closebox();
 452 }
 453
 454 # Draw current state of the IDS
 455 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 456
 457 # Check if the IDS is running and obtain the process-id.
 458 my $pid = &IDS::ids_is_running();
 459
 460 # Display some useful information, if suricata daemon is running.
 461 if ($pid) {
 462         # Gather used memory.
 463         my $memory = &get_memory_usage($pid);
 464
 465         print <<END;
 466                 <table width='95%' cellspacing='0' class='tbl'>
 467                         <tr>
 468                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 469                         </tr>
 470
 471                         <tr>
 472                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 473                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 474                         </tr>
 475
 476                         <tr>
 477                                 <td class='base'></td>
 478                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 479                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 480                         </tr>
 481
 482                         <tr>
 483                                 <td class='base'></td>
 484                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 485                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 486                         </tr>
 487                 </table>
 488 END
 489 } else {
 490         # Otherwise display a hint that the service is not launched.
 491         print <<END;
 492                 <table width='95%' cellspacing='0' class='tbl'>
 493                         <tr>
 494                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 495                         </tr>
 496
 497                         <tr>
 498                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 499                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 500                         </tr>
 501                 </table>
 502 END
 503 }
 504 &Header::closebox();
 505
 506 # Draw elements for IDS configuration.
 507 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 508
 509 my $rulesdate;
 510
 511 # Check if a ruleset allready has been downloaded.
 512 if ( -f "$IDS::rulestarball"){
 513         # Call stat on the filename to obtain detailed information.
 514         my @Info = stat("$IDS::rulestarball");
 515
 516         # Grab details about the creation time.
 517         $rulesdate = localtime($Info[9]);
 518 }
 519
 520 print <<END
 521 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 522         <table width='100%' border='0'>
 523                 <tr>
 524                         <td class='base' colspan='4'>
 525                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 526                         </td>
 527                 </tr>
 528
 529                 <tr>
 530                         <td colspan='4'><br><br></td>
 531                 </tr>
 532
 533                 <tr>
 534                         <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
 535                 </tr>
 536
 537                 <tr>
 538                         <td class='base' colspan='4'>
 539                                 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'} &nbsp&nbsp&nbsp
 540                                 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
 541                         </td>
 542                 </tr>
 543
 544                 <tr>
 545                         <td colspan='4'><br></td>
 546                 </tr>
 547
 548                 <tr>
 549                         <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
 550                 </tr>
 551
 552                 <tr>
 553 END
 554 ;
 555
 556 # Loop through the array of available networks and print config options.
 557 foreach my $zone (@network_zones) {
 558         my $checked_input;
 559         my $checked_forward;
 560
 561         # Convert current zone name to upper case.
 562         my $zone_upper = uc($zone);
 563
 564         # Grab checkbox status from settings hash.
 565         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 566                 $checked_input = "checked = 'checked'";
 567         }
 568
 569         print "<td class='base' width='25%'>\n";
 570         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
 571         print "</td>\n";
 572 }
 573
 574 print <<END
 575                 </tr>
 576
 577                 <tr>
 578                         <td colspan='4'><br><br></td>
 579                 </tr>
 580
 581                 <tr>
 582                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 583                 </tr>
 584
 585                 <tr>
 586                         <td colspan='4'><select name='RULES'>
 587                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 588                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 589                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 590                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 591                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 592                         </select>
 593                         </td>
 594                 </tr>
 595
 596                 <tr>
 597                         <td colspan='4'>
 598                                 <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>
 599                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 600                         </td>
 601                 </tr>
 602
 603                 <tr>
 604                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 605                 </tr>
 606
 607                 <tr>
 608                         <td colspan='4' align='left'><br>
 609                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 610                         </td>
 611
 612                 </tr>
 613         </table>
 614
 615         <br><br>
 616
 617         <table width='100%'>
 618                 <tr>
 619                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 620                 </tr>
 621         </table>
 622 </form>
 623 END
 624 ;
 625
 626 &Header::closebox();
 627
 628 # Only show the section for configuring the ruleset if one is present.
 629 if (%idsrules) {
 630         &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 631
 632                 print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 633
 634                 # Output display table for rule files
 635                 print "<table width='100%'>\n";
 636
 637                 # Local variable required for java script to show/hide
 638                 # rules of a rulefile.
 639                 my $rulesetcount = 1;
 640
 641                 # Loop over each rule file
 642                 foreach my $rulefile (sort keys(%idsrules)) {
 643                         my $rulechecked = '';
 644
 645                         # Check if rule file is enabled
 646                         if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 647                                 $rulechecked = 'CHECKED';
 648                         }
 649
 650                         # Table and rows for the rule files.
 651                         print"<tr>\n";
 652                         print"<td class='base' width='5%'>\n";
 653                         print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 654                         print"</td>\n";
 655                         print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 656                         print"<td class='base' width='5%' align='right'>\n";
 657                         print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 658                         print"</td>\n";
 659                         print"</tr>\n";
 660
 661                         # Rows which will be hidden per default and will contain the single rules.
 662                         print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 663                         print"<td colspan='3'>\n";
 664
 665                         # Local vars
 666                         my $lines;
 667                         my $rows;
 668                         my $col;
 669
 670                         # New table for the single rules.
 671                         print "<table width='100%'>\n";
 672
 673                         # Loop over rule file rules
 674                         foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 675                                 # Local vars
 676                                 my $ruledefchecked = '';
 677
 678                                 # Skip rulefile itself.
 679                                 next if ($sid eq "Rulefile");
 680
 681                                 # If 2 rules have been displayed, start a new row
 682                                 if (($lines % 2) == 0) {
 683                                         print "</tr><tr>\n";
 684
 685                                         # Increase rows by once.
 686                                         $rows++;
 687                                 }
 688
 689                                 # Colour lines.
 690                                 if ($rows % 2) {
 691                                         $col="bgcolor='$color{'color20'}'";
 692                                 } else {
 693                                         $col="bgcolor='$color{'color22'}'";
 694                                 }
 695
 696                                 # Set rule state
 697                                 if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 698                                         $ruledefchecked = 'CHECKED';
 699                                 }
 700
 701                                 # Create rule checkbox and display rule description
 702                                 print "<td class='base' width='5%' align='right' $col>\n";
 703                                 print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 704                                 print "</td>\n";
 705                                 print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
 706
 707                                 # Increment rule count
 708                                 $lines++;
 709                         }
 710
 711                         # If do not have a second rule for row, create empty cell
 712                         if (($lines % 2) != 0) {
 713                                 print "<td class='base'></td>";
 714                         }
 715
 716                         # Close display table
 717                         print "</tr></table></td></tr>";
 718
 719                         # Finished whith the rule file, increase count.
 720                         $rulesetcount++;
 721                 }
 722
 723                 # Close display table
 724                 print "</table>";
 725
 726 print <<END
 727 <table width='100%'>
 728 <tr>
 729         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 730                 &nbsp; <!-- space for future online help link -->
 731         </td>
 732 </tr>
 733 </table>
 734 </form>
 735 END
 736 ;
 737         &Header::closebox();
 738 }
 739
 740 &Header::closebigbox();
 741 &Header::closepage();
 742
 743 #
 744 ## A function to display a notice, to lock the webpage and
 745 ## tell the user which action currently will be performed.
 746 #
 747 sub working_notice ($) {
 748         my ($message) = @_;
 749
 750         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 751         &Header::openbigbox('100%', 'left', '', $errormessage);
 752         &Header::openbox( 'Waiting', 1,);
 753                 print <<END;
 754                         <table>
 755                                 <tr>
 756                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
 757                                         <td>$message</td>
 758                                 </tr>
 759                         </table>
 760 END
 761         &Header::closebox();
 762         &Header::closebigbox();
 763         &Header::closepage();
 764 }
 765
 766 #
 767 ## A tiny function to perform a reload of the webpage after one second.
 768 #
 769 sub reload () {
 770         print "<meta http-equiv='refresh' content='1'>\n";
 771
 772         # Stop the script.
 773         exit;
 774 }
 775
 776 #
 777 ## Private function to read-in and parse rules of a given rulefile.
 778 #
 779 ## The given file will be read, parsed and all valid rules will be stored by ID,
 780 ## message/description and it's state in the idsrules hash.
 781 #
 782 sub readrulesfile ($) {
 783         my $rulefile = shift;
 784
 785         # Open rule file and read in contents
 786         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
 787
 788         # Store file content in an array.
 789         my @lines = <RULEFILE>;
 790
 791         # Close file.
 792         close(RULEFILE);
 793
 794         # Loop over rule file contents
 795         foreach my $line (@lines) {
 796                 # Remove whitespaces.
 797                 chomp $line;
 798
 799                 # Skip blank  lines.
 800                 next if ($line =~ /^\s*$/);
 801
 802                 # Local vars.
 803                 my $sid;
 804                 my $msg;
 805
 806                 # Gather rule sid and message from the ruleline.
 807                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 808                         $msg = $1;
 809                         $sid = $2;
 810
 811                         # Check if a rule has been found.
 812                         if ($sid && $msg) {
 813                                 # Add rule to the idsrules hash.
 814                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
 815
 816                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 817                                 if ($line =~ /^\#/) {
 818                                         # If yes, the rule is disabled.
 819                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
 820                                 } else {
 821                                         # Otherwise the rule is enabled.
 822                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
 823                                 }
 824                         }
 825                 }
 826         }
 827 }
 828
 829 #
 830 ## Function to get the used memory of a given process-id.
 831 #
 832 sub get_memory_usage($) {
 833         my ($pid) = @_;
 834
 835         my $memory = 0;
 836
 837         # Try to open the status file for the given process-id on the pseudo
 838         # file system proc.
 839         if (open(FILE, "/proc/$pid/status")) {
 840                 # Loop through the entire file.
 841                 while (<FILE>) {
 842                         # Splitt current line content and store them into variables.
 843                         my ($key, $value) = split(":", $_, 2);
 844
 845                         # Check if the current key is the one which contains the memory usage.
 846                         # The wanted one is VmRSS which contains the Real-memory (resident set)
 847                         # of the entire process.
 848                         if ($key eq "VmRSS") {
 849                                 # Found the memory usage add it to the memory variable.
 850                                 $memory += $value;
 851
 852                                 # Break the loop.
 853                                 last;
 854                         }
 855                 }
 856
 857                 # Close file handle.
 858                 close(FILE);
 859
 860                 # Return memory usage.
 861                 return $memory;
 862         }
 863
 864         # If the file could not be open, return nothing.
 865         return;
 866 }
 867
 868 #
 869 ## Function to generate the file which contains the home net information.
 870 #
 871 sub generate_home_net_file() {
 872         my %netsettings;
 873
 874         # Read-in network settings.
 875         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
 876
 877         # Get available network zones.
 878         my @network_zones = &IDS::get_available_network_zones();
 879
 880         # Temporary array to store network address and prefix of the configured
 881         # networks.
 882         my @networks;
 883
 884         # Loop through the array of available network zones.
 885         foreach my $zone (@network_zones) {
 886                 # Skip the red network - It never can be part to the home_net!
 887                 next if($zone eq "red");
 888
 889                 # Convert current zone name into upper case.
 890                 $zone = uc($zone);
 891
 892                 # Generate key to access the required data from the netsettings hash.
 893                 my $zone_netaddress = $zone . "_NETADDRESS";
 894                 my $zone_netmask = $zone . "_NETMASK";
 895
 896                 # Obtain the settings from the netsettings hash.
 897                 my $netaddress = $netsettings{$zone_netaddress};
 898                 my $netmask = $netsettings{$zone_netmask};
 899
 900                 # Convert the subnetmask into prefix notation.
 901                 my $prefix = &Network::convert_netmask2prefix($netmask);
 902
 903                 # Generate full network string.
 904                 my $network = join("/", $netaddress,$prefix);
 905
 906                 # Check if the network is valid.
 907                 if(&Network::check_subnet($network)) {
 908                         # Add the generated network to the array of networks.
 909                         push(@networks, $network);
 910                 }
 911         }
 912
 913         # Format home net declaration.
 914         my $line = "\"\[";
 915
 916         # Loop through the array of networks.
 917         foreach my $network (@networks) {
 918                 # Add the network to the line.
 919                 $line = "$line" . "$network";
 920
 921                 # Check if the current network was the last in the array.
 922                 if ($network eq $networks[-1]) {
 923                         # Close the line.
 924                         $line = "$line" . "\]\"";
 925                 } else {
 926                         # Add "," for the next network.
 927                         $line = "$line" . "\,";
 928                 }
 929         }
 930
 931         # Open file to store the addresses of the home net.
 932         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
 933
 934         # Print yaml header.
 935         print FILE "%YAML 1.1\n";
 936         print FILE "---\n\n";
 937
 938         # Print notice about autogenerated file.
 939         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 940
 941         # Print the generated and required HOME_NET declaration to the file.
 942         print FILE "HOME_NET:\t$line\n";
 943
 944         # Close file handle.
 945         close(FILE);
 946
 947 }
 948
 949 #
 950 ## Function to read-in the given enabled or disables sids file.
 951 #
 952 sub read_enabled_disabled_sids_file($) {
 953         my ($file) = @_;
 954
 955         # Temporary hash to store the sids and their state. It will be
 956         # returned at the end of this function.
 957         my %temphash;
 958
 959         # Open the given filename.
 960         open(FILE, "$file") or die "Could not open $file. $!\n";
 961
 962         # Loop through the file.
 963         while(<FILE>) {
 964                 # Remove newlines.
 965                 chomp $_;
 966
 967                 # Skip blank lines.
 968                 next if ($_ =~ /^\s*$/);
 969
 970                 # Skip coments.
 971                 next if ($_ =~ /^\#/);
 972
 973                 # Splitt line into sid and state part.
 974                 my ($state, $sid) = split(" ", $_);
 975
 976                 # Skip line if the sid is not numeric.
 977                 next unless ($sid =~ /\d+/ );
 978
 979                 # Check if the sid was enabled.
 980                 if ($state eq "enablesid") {
 981                         # Add the sid and its state as enabled to the temporary hash.
 982                         $temphash{$sid} = "enabled";
 983                 # Check if the sid was disabled.
 984                 } elsif ($state eq "disablesid") {
 985                         # Add the sid and its state as disabled to the temporary hash.
 986                         $temphash{$sid} = "disabled";
 987                 # Invalid state - skip the current sid and state.
 988                 } else {
 989                         next;
 990                 }
 991         }
 992
 993         # Close filehandle.
 994         close(FILE);
 995
 996         # Return the hash.
 997         return %temphash;
 998 }