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::is_ids_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::is_ids_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         # Prevent form name from been stored in conf file.
 311         delete $cgiparams{'IDS'};
 312
 313         # Check if an oinkcode has been provided.
 314         if ($cgiparams{'OINKCODE'}) {
 315                 # Check if the oinkcode contains unallowed chars.
 316                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 317                         $errormessage = $Lang::tr{'invalid input for oink code'};
 318                 }
 319         }
 320
 321         # Go on if there are no error messages.
 322         if (!$errormessage) {
 323                 # Store settings into settings file.
 324                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 325         }
 326
 327         # Generate file to store the home net.
 328         &generate_home_net_file();
 329
 330         # Check if the IDS currently is running.
 331         if(&IDS::ids_is_running()) {
 332                 # Check if ENABLE_IDS is set to on.
 333                 if($cgiparams{'ENABLE_IDS'} eq "on") {
 334                         # Call suricatactrl to perform a reload of suricata.
 335                         &IDS::call_suricatactrl("reload");
 336                 } else {
 337                         # Call suricatactrl to stop suricata.
 338                         &IDS::call_suricatactrl("stop");
 339                 }
 340         } else {
 341                 # Call suricatactrl to start suricata.
 342                 &IDS::call_suricatactrl("start");
 343         }
 344 }
 345
 346 # Read-in idssettings
 347 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 348
 349 # If the runmode has not been configured yet, set default value.
 350 unless(exists($idssettings{'RUN_MODE'})) {
 351         # Set default to IPS.
 352         $idssettings{'RUN_MODE'} = 'IPS';
 353 }
 354
 355 $checked{'ENABLE_IDS'}{'off'} = '';
 356 $checked{'ENABLE_IDS'}{'on'} = '';
 357 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 358 $checked{'RUN_MODE'}{'IDS'} = '';
 359 $checked{'RUN_MODE'}{'IPS'} = '';
 360 $checked{'RUN_MODE'}{$idssettings{'RUN_MODE'}} = "checked='checked'";
 361 $selected{'RULES'}{'nothing'} = '';
 362 $selected{'RULES'}{'community'} = '';
 363 $selected{'RULES'}{'emerging'} = '';
 364 $selected{'RULES'}{'registered'} = '';
 365 $selected{'RULES'}{'subscripted'} = '';
 366 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 367
 368 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 369
 370 ### Java Script ###
 371 print <<END
 372 <script>
 373         // Tiny java script function to show/hide the rules
 374         // of a given category.
 375         function showhide(tblname) {
 376                 \$("#" + tblname).toggle();
 377         }
 378 </script>
 379 END
 380 ;
 381
 382 &Header::openbigbox('100%', 'left', '', $errormessage);
 383
 384 if ($errormessage) {
 385         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 386         print "<class name='base'>$errormessage\n";
 387         print "&nbsp;</class>\n";
 388         &Header::closebox();
 389 }
 390
 391 # Draw current state of the IDS
 392 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 393
 394 # Check if the IDS is running and obtain the process-id.
 395 my $pid = &IDS::ids_is_running();
 396
 397 # Display some useful information, if suricata daemon is running.
 398 if ($pid) {
 399         # Gather used memory.
 400         my $memory = &get_memory_usage($pid);
 401
 402         print <<END;
 403                 <table width='95%' cellspacing='0' class='tbl'>
 404                         <tr>
 405                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 406                         </tr>
 407
 408                         <tr>
 409                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 410                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 411                         </tr>
 412
 413                         <tr>
 414                                 <td class='base'></td>
 415                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 416                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 417                         </tr>
 418
 419                         <tr>
 420                                 <td class='base'></td>
 421                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 422                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 423                         </tr>
 424                 </table>
 425 END
 426 } else {
 427         # Otherwise display a hint that the service is not launched.
 428         print <<END;
 429                 <table width='95%' cellspacing='0' class='tbl'>
 430                         <tr>
 431                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 432                         </tr>
 433
 434                         <tr>
 435                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 436                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 437                         </tr>
 438                 </table>
 439 END
 440 }
 441 &Header::closebox();
 442
 443 # Draw elements for IDS configuration.
 444 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 445
 446 my $rulesdate;
 447
 448 # Check if a ruleset allready has been downloaded.
 449 if ( -f "$IDS::rulestarball"){
 450         # Call stat on the filename to obtain detailed information.
 451         my @Info = stat("$IDS::rulestarball");
 452
 453         # Grab details about the creation time.
 454         $rulesdate = localtime($Info[9]);
 455 }
 456
 457 print <<END
 458 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 459         <table width='100%' border='0'>
 460                 <tr>
 461                         <td class='base' colspan='4'>
 462                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 463                         </td>
 464                 </tr>
 465
 466                 <tr>
 467                         <td colspan='4'><br><br></td>
 468                 </tr>
 469
 470                 <tr>
 471                         <td class='base' colspan='4'><b>$Lang::tr{'runmode'}</b></td>
 472                 </tr>
 473
 474                 <tr>
 475                         <td class='base' colspan='4'>
 476                                 <input type='radio' name='RUN_MODE' value='IDS' $checked{'RUN_MODE'}{'IDS'}>$Lang::tr{'intrusion detection system2'} &nbsp&nbsp&nbsp
 477                                 <input type='radio' name='RUN_MODE' value='IPS' $checked{'RUN_MODE'}{'IPS'}>$Lang::tr{'intrusion prevention system'}
 478                         </td>
 479                 </tr>
 480
 481                 <tr>
 482                         <td colspan='4'><br></td>
 483                 </tr>
 484
 485                 <tr>
 486                         <td colspan='4'><b>$Lang::tr{'ids traffic analyze'}</b><br></td>
 487                 </tr>
 488
 489                 <tr>
 490 END
 491 ;
 492
 493 # Loop through the array of available networks and print config options.
 494 foreach my $zone (@network_zones) {
 495         my $checked_input;
 496         my $checked_forward;
 497
 498         # Convert current zone name to upper case.
 499         my $zone_upper = uc($zone);
 500
 501         # Grab checkbox status from settings hash.
 502         if ($idssettings{"ENABLE_IDS_$zone_upper"} eq "on") {
 503                 $checked_input = "checked = 'checked'";
 504         }
 505
 506         print "<td class='base' width='25%'>\n";
 507         print "<input type='checkbox' name='ENABLE_IDS_$zone_upper' $checked_input>$Lang::tr{'enabled on'} $Lang::tr{$zone}\n";
 508         print "</td>\n";
 509 }
 510
 511 print <<END
 512                 </tr>
 513
 514                 <tr>
 515                         <td colspan='4'><br><br></td>
 516                 </tr>
 517
 518                 <tr>
 519                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 520                 </tr>
 521
 522                 <tr>
 523                         <td colspan='4'><select name='RULES'>
 524                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 525                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 526                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 527                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 528                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 529                         </select>
 530                         </td>
 531                 </tr>
 532
 533                 <tr>
 534                         <td colspan='4'>
 535                                 <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>
 536                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 537                         </td>
 538                 </tr>
 539
 540                 <tr>
 541                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 542                 </tr>
 543
 544                 <tr>
 545                         <td colspan='4' align='left'><br>
 546                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 547                         </td>
 548
 549                 </tr>
 550         </table>
 551
 552         <br><br>
 553
 554         <table width='100%'>
 555                 <tr>
 556                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 557                 </tr>
 558         </table>
 559 </form>
 560 END
 561 ;
 562
 563 &Header::closebox();
 564
 565 &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 566         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 567
 568         # Output display table for rule files
 569         print "<table width='100%'>\n";
 570
 571         # Local variable required for java script to show/hide
 572         # rules of a rulefile.
 573         my $rulesetcount = 1;
 574
 575         # Loop over each rule file
 576         foreach my $rulefile (sort keys(%idsrules)) {
 577                 my $rulechecked = '';
 578
 579                 # Check if rule file is enabled
 580                 if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 581                         $rulechecked = 'CHECKED';
 582                 }
 583
 584                 # Table and rows for the rule files.
 585                 print"<tr>\n";
 586                 print"<td class='base' width='5%'>\n";
 587                 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 588                 print"</td>\n";
 589                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 590                 print"<td class='base' width='5%' align='right'>\n";
 591                 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 592                 print"</td>\n";
 593                 print"</tr>\n";
 594
 595                 # Rows which will be hidden per default and will contain the single rules.
 596                 print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 597                 print"<td colspan='3'>\n";
 598
 599                 # Local vars
 600                 my $lines;
 601                 my $rows;
 602                 my $col;
 603
 604                 # New table for the single rules.
 605                 print "<table width='100%'>\n";
 606
 607                 # Loop over rule file rules
 608                 foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 609                         # Local vars
 610                         my $ruledefchecked = '';
 611
 612                         # Skip rulefile itself.
 613                         next if ($sid eq "Rulefile");
 614
 615                         # If 2 rules have been displayed, start a new row
 616                         if (($lines % 2) == 0) {
 617                                 print "</tr><tr>\n";
 618
 619                                 # Increase rows by once.
 620                                 $rows++;
 621                         }
 622
 623                         # Colour lines.
 624                         if ($rows % 2) {
 625                                 $col="bgcolor='$color{'color20'}'";
 626                         } else {
 627                                 $col="bgcolor='$color{'color22'}'";
 628                         }
 629
 630                         # Set rule state
 631                         if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 632                                 $ruledefchecked = 'CHECKED';
 633                         }
 634
 635                         # Create rule checkbox and display rule description
 636                         print "<td class='base' width='5%' align='right' $col>\n";
 637                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 638                         print "</td>\n";
 639                         print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
 640
 641                         # Increment rule count
 642                         $lines++;
 643                 }
 644
 645                 # If do not have a second rule for row, create empty cell
 646                 if (($lines % 2) != 0) {
 647                         print "<td class='base'></td>";
 648                 }
 649
 650                 # Close display table
 651                 print "</tr></table></td></tr>";
 652
 653                 # Finished whith the rule file, increase count.
 654                 $rulesetcount++;
 655         }
 656
 657         # Close display table
 658         print "</table>";
 659
 660 print <<END
 661 <table width='100%'>
 662 <tr>
 663         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 664                 &nbsp; <!-- space for future online help link -->
 665         </td>
 666 </tr>
 667 </table>
 668 </form>
 669 END
 670 ;
 671 &Header::closebox();
 672 &Header::closebigbox();
 673 &Header::closepage();
 674
 675 #
 676 ## A function to display a notice, to lock the webpage and
 677 ## tell the user which action currently will be performed.
 678 #
 679 sub working_notice ($) {
 680         my ($message) = @_;
 681
 682         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 683         &Header::openbigbox('100%', 'left', '', $errormessage);
 684         &Header::openbox( 'Waiting', 1,);
 685                 print <<END;
 686                         <table>
 687                                 <tr>
 688                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
 689                                         <td>$message</td>
 690                                 </tr>
 691                         </table>
 692 END
 693         &Header::closebox();
 694         &Header::closebigbox();
 695         &Header::closepage();
 696 }
 697
 698 #
 699 ## A tiny function to perform a reload of the webpage after one second.
 700 #
 701 sub reload () {
 702         print "<meta http-equiv='refresh' content='1'>\n";
 703
 704         # Stop the script.
 705         exit;
 706 }
 707
 708 #
 709 ## Private function to read-in and parse rules of a given rulefile.
 710 #
 711 ## The given file will be read, parsed and all valid rules will be stored by ID,
 712 ## message/description and it's state in the idsrules hash.
 713 #
 714 sub readrulesfile ($) {
 715         my $rulefile = shift;
 716
 717         # Open rule file and read in contents
 718         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
 719
 720         # Store file content in an array.
 721         my @lines = <RULEFILE>;
 722
 723         # Close file.
 724         close(RULEFILE);
 725
 726         # Loop over rule file contents
 727         foreach my $line (@lines) {
 728                 # Remove whitespaces.
 729                 chomp $line;
 730
 731                 # Skip blank  lines.
 732                 next if ($line =~ /^\s*$/);
 733
 734                 # Local vars.
 735                 my $sid;
 736                 my $msg;
 737
 738                 # Gather rule sid and message from the ruleline.
 739                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 740                         $msg = $1;
 741                         $sid = $2;
 742
 743                         # Check if a rule has been found.
 744                         if ($sid && $msg) {
 745                                 # Add rule to the idsrules hash.
 746                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
 747
 748                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 749                                 if ($line =~ /^\#/) {
 750                                         # If yes, the rule is disabled.
 751                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
 752                                 } else {
 753                                         # Otherwise the rule is enabled.
 754                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
 755                                 }
 756                         }
 757                 }
 758         }
 759 }
 760
 761 #
 762 ## Function to get the used memory of a given process-id.
 763 #
 764 sub get_memory_usage($) {
 765         my $pid = @_;
 766
 767         my $memory=0;
 768
 769         # Try to open statm file for the given process-id on the pseudo
 770         # file system proc.
 771         if (open(FILE, "/proc/$pid/statm")) {
 772                 # Read file content.
 773                 my $temp = <FILE>;
 774
 775                 # Splitt file content and store in an array.
 776                 my @memory = split(/ /,$temp);
 777
 778                 # Close file handle.
 779                 close(FILE);
 780
 781                 # Calculate memory usage.
 782                 $memory+=$memory[0];
 783
 784                 # Return memory usage.
 785                 return $memory;
 786         }
 787
 788         # If the file could not be open, return nothing.
 789         return;
 790 }
 791
 792 #
 793 ## Function to generate the file which contains the home net information.
 794 #
 795 sub generate_home_net_file() {
 796         my %netsettings;
 797
 798         # Read-in network settings.
 799         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
 800
 801         # Get available network zones.
 802         my @network_zones = &IDS::get_available_network_zones();
 803
 804         # Temporary array to store network address and prefix of the configured
 805         # networks.
 806         my @networks;
 807
 808         # Loop through the array of available network zones.
 809         foreach my $zone (@network_zones) {
 810                 # Skip the red network - It never can be part to the home_net!
 811                 next if($zone eq "red");
 812
 813                 # Convert current zone name into upper case.
 814                 $zone = uc($zone);
 815
 816                 # Generate key to access the required data from the netsettings hash.
 817                 my $zone_netaddress = $zone . "_NETADDRESS";
 818                 my $zone_netmask = $zone . "_NETMASK";
 819
 820                 # Obtain the settings from the netsettings hash.
 821                 my $netaddress = $netsettings{$zone_netaddress};
 822                 my $netmask = $netsettings{$zone_netmask};
 823
 824                 # Convert the subnetmask into prefix notation.
 825                 my $prefix = &Network::convert_netmask2prefix($netmask);
 826
 827                 # Generate full network string.
 828                 my $network = join("/", $netaddress,$prefix);
 829
 830                 # Check if the network is valid.
 831                 if(&Network::check_subnet($network)) {
 832                         # Add the generated network to the array of networks.
 833                         push(@networks, $network);
 834                 }
 835         }
 836
 837         # Format home net declaration.
 838         my $line = "\"\[";
 839
 840         # Loop through the array of networks.
 841         foreach my $network (@networks) {
 842                 # Add the network to the line.
 843                 $line = "$line" . "$network";
 844
 845                 # Check if the current network was the last in the array.
 846                 if ($network eq $networks[-1]) {
 847                         # Close the line.
 848                         $line = "$line" . "\]\"";
 849                 } else {
 850                         # Add "," for the next network.
 851                         $line = "$line" . "\,";
 852                 }
 853         }
 854
 855         # Open file to store the addresses of the home net.
 856         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
 857
 858         # Print yaml header.
 859         print FILE "%YAML 1.1\n";
 860         print FILE "---\n\n";
 861
 862         # Print notice about autogenerated file.
 863         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 864
 865         # Print the generated and required HOME_NET declaration to the file.
 866         print FILE "HOME_NET:\t$line\n";
 867
 868         # Close file handle.
 869         close(FILE);
 870
 871 }