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