html/cgi-bin/ids.cgi

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2007-2015  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 "${General::swroot}/ids-functions.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %netsettings = ();
  36 my %snortrules = ();
  37 my %snortsettings=();
  38 my %rulesetsources = ();
  39 my %cgiparams=();
  40 my %checked=();
  41 my %selected=();
  42
  43 # Read-in main settings, for language, theme and colors.
  44 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  45 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  46
  47 # Get netsettings.
  48 &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
  49
  50 my $snortrulepath = "/etc/snort/rules";
  51 my $snortusedrulefilesfile = "${General::swroot}/snort/snort-used-rulefiles.conf";
  52 my $errormessage;
  53
  54 &Header::showhttpheaders();
  55
  56 # Default settings for snort.
  57 $snortsettings{'ENABLE_SNORT'} = 'off';
  58 $snortsettings{'ENABLE_SNORT_GREEN'} = 'off';
  59 $snortsettings{'ENABLE_SNORT_BLUE'} = 'off';
  60 $snortsettings{'ENABLE_SNORT_ORANGE'} = 'off';
  61 $snortsettings{'RULES'} = '';
  62 $snortsettings{'OINKCODE'} = '';
  63
  64 #Get GUI values
  65 &Header::getcgihash(\%cgiparams);
  66
  67 # Try to determine if oinkmaster is running.
  68 my $oinkmaster_pid = `pidof oinkmaster.pl -x`;
  69
  70 # If oinkmaster is running display output.
  71 if ($oinkmaster_pid) {
  72         &working("$Lang::tr{'snort working'}");
  73 }
  74
  75 # Check if any error has been stored.
  76 if (-e $IDS::storederrorfile) {
  77         # Open file to read in the stored error message.
  78         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
  79
  80         # Read the stored error message.
  81         $errormessage = <FILE>;
  82
  83         # Close file.
  84         close (FILE);
  85
  86         # Delete the file, which is now not longer required.
  87         unlink($IDS::storederrorfile);
  88 }
  89
  90
  91 ## Grab all available snort rules and store them in the snortrules hash.
  92 #
  93 # Open snort rules directory and do a directory listing.
  94 opendir(DIR, $snortrulepath) or die $!;
  95         # Loop through the direcory.
  96         while (my $file = readdir(DIR)) {
  97
  98                 # We only want files.
  99                 next unless (-f "$snortrulepath/$file");
 100
 101                 # Ignore empty files.
 102                 next if (-z "$snortrulepath/$file");
 103
 104                 # Use a regular expression to find files ending in .rules
 105                 next unless ($file =~ m/\.rules$/);
 106
 107                 # Ignore files which are not read-able.
 108                 next unless (-R "$snortrulepath/$file");
 109
 110                 # Call subfunction to read-in rulefile and add rules to
 111                 # the snortrules hash.
 112                 &readrulesfile("$file");
 113         }
 114
 115 closedir(DIR);
 116
 117 # Gather used rulefiles.
 118 #
 119 # Check if the file for activated rulefiles is not empty.
 120 if(-f $snortusedrulefilesfile) {
 121         # Open the file for used rulefile and read-in content.
 122         open(FILE, $snortusedrulefilesfile) or die "Could not open $snortusedrulefilesfile. $!\n";
 123
 124         # Read-in content.
 125         my @lines = <FILE>;
 126
 127         # Close file.
 128         close(FILE);
 129
 130         # Loop through the array.
 131         foreach my $line (@lines) {
 132                 # Remove newlines.
 133                 chomp($line);
 134
 135                 # Skip comments.
 136                 next if ($line =~ /\#/);
 137
 138                 # Skip blank  lines.
 139                 next if ($line =~ /^\s*$/);
 140
 141                 # Gather rule sid and message from the ruleline.
 142                 if ($line =~ /.*include \$RULE_PATH\/(.*)/) {
 143                         my $rulefile = $1;
 144
 145                         # Add the rulefile to the %snortrules hash.
 146                         $snortrules{$rulefile}{'Rulefile'}{'State'} = "on";
 147                 }
 148         }
 149 }
 150
 151 # Save ruleset.
 152 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 153         my $enabled_sids_file = "${General::swroot}/snort/oinkmaster-enabled-sids.conf";
 154         my $disabled_sids_file = "${General::swroot}/snort/oinkmaster-disabled-sids.conf";
 155
 156         # Arrays to store sid which should be added to the corresponding files.
 157         my @enabled_sids;
 158         my @disabled_sids;
 159         my @enabled_rulefiles;
 160
 161         # Loop through the hash of snortrules.
 162         foreach my $rulefile(keys %snortrules) {
 163                 # Check if the rulefile is enabled.
 164                 if ($cgiparams{$rulefile} eq "on") {
 165                         # Add rulefile to the array of enabled rulefiles.
 166                         push(@enabled_rulefiles, $rulefile);
 167
 168                         # Drop item from cgiparams hash.
 169                         delete $cgiparams{$rulefile};
 170                 }
 171         }
 172
 173         # Loop through the hash of snortrules.
 174         foreach my $rulefile (keys %snortrules) {
 175                 # Loop through the single rules of the rulefile.
 176                 foreach my $sid (keys %{$snortrules{$rulefile}}) {
 177                         # Skip the current sid if it is not numeric.
 178                         next unless ($sid =~ /\d+/ );
 179
 180                         # Check if there exists a key in the cgiparams hash for this sid.
 181                         if (exists($cgiparams{$sid})) {
 182                                 # Look if the rule is disabled.
 183                                 if ($snortrules{$rulefile}{$sid}{'State'} eq "off") {
 184                                         # Check if the state has been set to 'on'.
 185                                         if ($cgiparams{$sid} eq "on") {
 186                                                 # Add the sid to the enabled_sids array.
 187                                                 push(@enabled_sids, $sid);
 188
 189                                                 # Drop item from cgiparams hash.
 190                                                 delete $cgiparams{$rulefile}{$sid};
 191                                         }
 192                                 }
 193                         } else {
 194                                 # Look if the rule is enabled.
 195                                 if ($snortrules{$rulefile}{$sid}{'State'} eq "on") {
 196                                         # Check if the state is 'on' and should be disabled.
 197                                         # In this case there is no entry
 198                                         # for the sid in the cgiparams hash.
 199                                         # Add it to the disabled_sids array.
 200                                         push(@disabled_sids, $sid);
 201
 202                                         # Drop item from cgiparams hash.
 203                                         delete $cgiparams{$rulefile}{$sid};
 204                                 }
 205                         }
 206                 }
 207         }
 208
 209         # Open enabled sid's file for writing.
 210         open(FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 211
 212         # Write header to file.
 213         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 214
 215         # Check if the enabled_sids array contains any sid's.
 216         if (@enabled_sids) {
 217                 # Loop through the array of enabled sids and write them to the file.
 218                 foreach my $sid (@enabled_sids) {
 219                         print FILE "enablesid $sid\n";
 220                 }
 221         }
 222
 223         # Close file after writing.
 224         close(FILE);
 225
 226         # Open disabled sid's file for writing.
 227         open(FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 228
 229         # Write header to file.
 230         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 231
 232         # Check if the enabled_sids array contains any sid's.
 233         if (@disabled_sids) {
 234                 # Loop through the array of disabled sids and write them to the file.
 235                 foreach my $sid (@disabled_sids) {
 236                         print FILE "disablesid $sid\n";
 237                 }
 238         }
 239
 240         # Close file after writing.
 241         close(FILE);
 242
 243         # Open file for used rulefiles.
 244         open (FILE, ">$snortusedrulefilesfile") or die "Could not write to $snortusedrulefilesfile. $!\n";
 245
 246         # Write header to file.
 247         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 248
 249         # Check if the enabled_rulefiles array contains any entries.
 250         if (@enabled_rulefiles) {
 251                 # Loop through the array of rulefiles which should be loaded and write the to the file.
 252                 foreach my $file (@enabled_rulefiles) {
 253                         print FILE "include \$RULE_PATH/$file\n";
 254                 }
 255         }
 256
 257         # Close file after writing.
 258         close(FILE);
 259
 260         # Lock the webpage and print message.
 261         &working_notice("$Lang::tr{'snort working'}");
 262
 263         # Call oinkmaster to alter the ruleset.
 264         &IDS::oinkmaster();
 265
 266         # Reload page.
 267         &reload();
 268
 269 # Download new ruleset.
 270 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 271         # Check if the red device is active.
 272         unless (-e "${General::swroot}/red/active") {
 273                 $errormessage = $Lang::tr{'could not download latest updates'};
 274         }
 275
 276         # Check if enought free disk space is availabe.
 277         $errormessage = &IDS::checkdiskspace();
 278
 279         # Check if any errors happend.
 280         unless ($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                 $errormessage = &IDS::downloadruleset();
 287
 288                 # Check if the downloader returned an error.
 289                 if ($errormessage) {
 290                         # Call function to store the errormessage.
 291                         &IDS::log_error($errormessage);
 292
 293                         # Preform a reload of the page.
 294                         &reload();
 295                 } else {
 296                         # Call subfunction to launch oinkmaster.
 297                         &IDS::oinkmaster();
 298
 299                         # Perform a reload of the page.
 300                         &reload();
 301                 }
 302         }
 303 # Save snort settings.
 304 } elsif ($cgiparams{'SNORT'} eq $Lang::tr{'save'}) {
 305         # Prevent form name from been stored in conf file.
 306         delete $cgiparams{'SNORT'};
 307
 308         # Check if an oinkcode has been provided.
 309         if ($cgiparams{'OINKCODE'}) {
 310                 # Check if the oinkcode contains unallowed chars.
 311                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 312                         $errormessage = $Lang::tr{'invalid input for oink code'};
 313                 }
 314         }
 315
 316         # Go on if there are no error messages.
 317         if (!$errormessage) {
 318                 # Store settings into settings file.
 319                 &General::writehash("${General::swroot}/snort/settings", \%cgiparams);
 320
 321                 # Call snortctrl to restart snort
 322                 system('/usr/local/bin/snortctrl restart >/dev/null');
 323         }
 324 }
 325
 326 # Read-in snortsettings
 327 &General::readhash("${General::swroot}/snort/settings", \%snortsettings);
 328
 329 $checked{'ENABLE_SNORT'}{'off'} = '';
 330 $checked{'ENABLE_SNORT'}{'on'} = '';
 331 $checked{'ENABLE_SNORT'}{$snortsettings{'ENABLE_SNORT'}} = "checked='checked'";
 332 $checked{'ENABLE_SNORT_GREEN'}{'off'} = '';
 333 $checked{'ENABLE_SNORT_GREEN'}{'on'} = '';
 334 $checked{'ENABLE_SNORT_GREEN'}{$snortsettings{'ENABLE_SNORT_GREEN'}} = "checked='checked'";
 335 $checked{'ENABLE_SNORT_BLUE'}{'off'} = '';
 336 $checked{'ENABLE_SNORT_BLUE'}{'on'} = '';
 337 $checked{'ENABLE_SNORT_BLUE'}{$snortsettings{'ENABLE_SNORT_BLUE'}} = "checked='checked'";
 338 $checked{'ENABLE_SNORT_ORANGE'}{'off'} = '';
 339 $checked{'ENABLE_SNORT_ORANGE'}{'on'} = '';
 340 $checked{'ENABLE_SNORT_ORANGE'}{$snortsettings{'ENABLE_SNORT_ORANGE'}} = "checked='checked'";
 341 $selected{'RULES'}{'nothing'} = '';
 342 $selected{'RULES'}{'community'} = '';
 343 $selected{'RULES'}{'emerging'} = '';
 344 $selected{'RULES'}{'registered'} = '';
 345 $selected{'RULES'}{'subscripted'} = '';
 346 $selected{'RULES'}{$snortsettings{'RULES'}} = "selected='selected'";
 347
 348 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 349
 350 ### Java Script ###
 351 print <<END
 352 <script>
 353         // Tiny java script function to show/hide the rules
 354         // of a given category.
 355         function showhide(tblname) {
 356                 \$("#" + tblname).toggle();
 357         }
 358 </script>
 359 END
 360 ;
 361
 362 &Header::openbigbox('100%', 'left', '', $errormessage);
 363
 364 if ($errormessage) {
 365         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 366         print "<class name='base'>$errormessage\n";
 367         print "&nbsp;</class>\n";
 368         &Header::closebox();
 369 }
 370
 371 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 372
 373 my $rulesdate;
 374
 375 # Check if a ruleset allready has been downloaded.
 376 if ( -f "$IDS::rulestarball"){
 377         # Call stat on the filename to obtain detailed information.
 378         my @Info = stat("$IDS::rulestarball");
 379
 380         # Grab details about the creation time.
 381         $rulesdate = localtime($Info[9]);
 382 }
 383
 384 print <<END
 385 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 386         <table width='100%' border='0'>
 387                 <tr>
 388                         <td class='base' width='25%'>
 389                                 <input type='checkbox' name='ENABLE_SNORT' $checked{'ENABLE_SNORT'}{'on'}>RED Snort
 390                         </td>
 391
 392                         <td class='base' width='25%'>
 393                                 <input type='checkbox' name='ENABLE_SNORT_GREEN' $checked{'ENABLE_SNORT_GREEN'}{'on'}>GREEN Snort
 394                         </td>
 395
 396                         <td class='base' width='25%'>
 397 END
 398 ;
 399
 400 # Check if a blue device is configured.
 401 if ($netsettings{'BLUE_DEV'}) {
 402   print "<input type='checkbox' name='ENABLE_SNORT_BLUE' $checked{'ENABLE_SNORT_BLUE'}{'on'} />BLUE Snort\n";
 403 }
 404
 405 print "</td>\n";
 406
 407 print "<td width='25%'>\n";
 408
 409 # Check if an orange device is configured.
 410 if ($netsettings{'ORANGE_DEV'}) {
 411   print "<input type='checkbox' name='ENABLE_SNORT_ORANGE' $checked{'ENABLE_SNORT_ORANGE'}{'on'} />ORANGE Snort\n";
 412 }
 413
 414 print <<END
 415                         </td>
 416                 </tr>
 417
 418                 <tr>
 419                         <td colspan='4'><br><br></td>
 420                 </tr>
 421
 422                 <tr>
 423                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 424                 </tr>
 425
 426                 <tr>
 427                         <td colspan='4'><select name='RULES'>
 428                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 429                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 430                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 431                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 432                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 433                         </select>
 434                         </td>
 435                 </tr>
 436
 437                 <tr>
 438                         <td colspan='4'>
 439                                 <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>
 440                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 441                         </td>
 442                 </tr>
 443
 444                 <tr>
 445                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$snortsettings{'OINKCODE'}'></td>
 446                 </tr>
 447
 448                 <tr>
 449                         <td colspan='4' align='left'><br>
 450                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 451                         </td>
 452
 453                 </tr>
 454         </table>
 455
 456         <br><br>
 457
 458         <table width='100%'>
 459                 <tr>
 460                         <td align='right'><input type='submit' name='SNORT' value='$Lang::tr{'save'}' /></td>
 461                 </tr>
 462         </table>
 463 </form>
 464 END
 465 ;
 466
 467 &Header::closebox();
 468
 469 &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 470         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 471
 472         # Output display table for rule files
 473         print "<table width='100%'>\n";
 474
 475         # Local variable required for java script to show/hide
 476         # rules of a rulefile.
 477         my $rulesetcount = 1;
 478
 479         # Loop over each rule file
 480         foreach my $rulefile (sort keys(%snortrules)) {
 481                 my $rulechecked = '';
 482
 483                 # Check if rule file is enabled
 484                 if ($snortrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 485                         $rulechecked = 'CHECKED';
 486                 }
 487
 488                 # Table and rows for the rule files.
 489                 print"<tr>\n";
 490                 print"<td class='base' width='5%'>\n";
 491                 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 492                 print"</td>\n";
 493                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 494                 print"<td class='base' width='5%' align='right'>\n";
 495                 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 496                 print"</td>\n";
 497                 print"</tr>\n";
 498
 499                 # Rows which will be hidden per default and will contain the single rules.
 500                 print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 501                 print"<td colspan='3'>\n";
 502
 503                 # Local vars
 504                 my $lines;
 505                 my $rows;
 506                 my $col;
 507
 508                 # New table for the single rules.
 509                 print "<table width='100%'>\n";
 510
 511                 # Loop over rule file rules
 512                 foreach my $sid (sort {$a <=> $b} keys(%{$snortrules{$rulefile}})) {
 513                         # Local vars
 514                         my $ruledefchecked = '';
 515
 516                         # Skip rulefile itself.
 517                         next if ($sid eq "Rulefile");
 518
 519                         # If 2 rules have been displayed, start a new row
 520                         if (($lines % 2) == 0) {
 521                                 print "</tr><tr>\n";
 522
 523                                 # Increase rows by once.
 524                                 $rows++;
 525                         }
 526
 527                         # Colour lines.
 528                         if ($rows % 2) {
 529                                 $col="bgcolor='$color{'color20'}'";
 530                         } else {
 531                                 $col="bgcolor='$color{'color22'}'";
 532                         }
 533
 534                         # Set rule state
 535                         if ($snortrules{$rulefile}{$sid}{'State'} eq 'on') {
 536                                 $ruledefchecked = 'CHECKED';
 537                         }
 538
 539                         # Create rule checkbox and display rule description
 540                         print "<td class='base' width='5%' align='right' $col>\n";
 541                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 542                         print "</td>\n";
 543                         print "<td class='base' width='45%' $col>$snortrules{$rulefile}{$sid}{'Description'}</td>";
 544
 545                         # Increment rule count
 546                         $lines++;
 547                 }
 548
 549                 # If do not have a second rule for row, create empty cell
 550                 if (($lines % 2) != 0) {
 551                         print "<td class='base'></td>";
 552                 }
 553
 554                 # Close display table
 555                 print "</tr></table></td></tr>";
 556
 557                 # Finished whith the rule file, increase count.
 558                 $rulesetcount++;
 559         }
 560
 561         # Close display table
 562         print "</table>";
 563
 564 print <<END
 565 <table width='100%'>
 566 <tr>
 567         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 568                 &nbsp; <!-- space for future online help link -->
 569         </td>
 570 </tr>
 571 </table>
 572 </form>
 573 END
 574 ;
 575 &Header::closebox();
 576 &Header::closebigbox();
 577 &Header::closepage();
 578
 579 #
 580 ## A function to display a notice, to lock the webpage and
 581 ## tell the user which action currently will be performed.
 582 #
 583 sub working_notice ($) {
 584         my ($message) = @_;
 585
 586         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 587         &Header::openbigbox('100%', 'left', '', $errormessage);
 588         &Header::openbox( 'Waiting', 1,);
 589                 print <<END;
 590                         <table>
 591                                 <tr>
 592                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
 593                                         <td>$message</td>
 594                                 </tr>
 595                         </table>
 596 END
 597         &Header::closebox();
 598         &Header::closebigbox();
 599         &Header::closepage();
 600 }
 601
 602 #
 603 ## A tiny function to perform a reload of the webpage after one second.
 604 #
 605 sub reload () {
 606         print "<meta http-equiv='refresh' content='1'>\n";
 607
 608         # Stop the script.
 609         exit;
 610 }
 611
 612 #
 613 ## Private function to read-in and parse rules of a given rulefile.
 614 #
 615 ## The given file will be read, parsed and all valid rules will be stored by ID,
 616 ## message/description and it's state in the snortrules hash.
 617 #
 618 sub readrulesfile ($) {
 619         my $rulefile = shift;
 620
 621         # Open rule file and read in contents
 622         open(RULEFILE, "$snortrulepath/$rulefile") or die "Unable to read $rulefile!";
 623
 624         # Store file content in an array.
 625         my @lines = <RULEFILE>;
 626
 627         # Close file.
 628         close(RULEFILE);
 629
 630         # Loop over rule file contents
 631         foreach my $line (@lines) {
 632                 # Remove whitespaces.
 633                 chomp $line;
 634
 635                 # Skip blank  lines.
 636                 next if ($line =~ /^\s*$/);
 637
 638                 # Local vars.
 639                 my $sid;
 640                 my $msg;
 641
 642                 # Gather rule sid and message from the ruleline.
 643                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 644                         $msg = $1;
 645                         $sid = $2;
 646
 647                         # Check if a rule has been found.
 648                         if ($sid && $msg) {
 649                                 # Add rule to the snortrules hash.
 650                                 $snortrules{$rulefile}{$sid}{'Description'} = $msg;
 651
 652                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 653                                 if ($line =~ /^\#/) {
 654                                         # If yes, the rule is disabled.
 655                                         $snortrules{$rulefile}{$sid}{'State'} = "off";
 656                                 } else {
 657                                         # Otherwise the rule is enabled.
 658                                         $snortrules{$rulefile}{$sid}{'State'} = "on";
 659                                 }
 660                         }
 661                 }
 662         }
 663 }