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