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 use File::Copy;
  28
  29 require '/var/ipfire/general-functions.pl';
  30 require "${General::swroot}/lang.pl";
  31 require "${General::swroot}/header.pl";
  32
  33 my %color = ();
  34 my %mainsettings = ();
  35 my %netsettings = ();
  36 my %snortsettings=();
  37 my %cgiparams=();
  38 my %checked=();
  39 my %selected=();
  40
  41 # Read-in main settings, for language, theme and colors.
  42 &General::readhash("${General::swroot}/main/settings", \%mainsettings);
  43 &General::readhash("/srv/web/ipfire/html/themes/".$mainsettings{'THEME'}."/include/colors.txt", \%color);
  44
  45 # Get netsettings.
  46 &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
  47
  48 &Header::showhttpheaders();
  49
  50 # Default settings for snort.
  51 $snortsettings{'ENABLE_SNORT'} = 'off';
  52 $snortsettings{'ENABLE_SNORT_GREEN'} = 'off';
  53 $snortsettings{'ENABLE_SNORT_BLUE'} = 'off';
  54 $snortsettings{'ENABLE_SNORT_ORANGE'} = 'off';
  55 $snortsettings{'ACTION'} = '';
  56 $snortsettings{'RULES'} = '';
  57 $snortsettings{'OINKCODE'} = '';
  58 $snortsettings{'INSTALLDATE'} = '';
  59
  60 #Get GUI values
  61 &Header::getcgihash(\%cgiparams);
  62
  63 my $snortrulepath = "/etc/snort/rules";
  64 my $restartsnortrequired = 0;
  65 my %snortrules;
  66 my $errormessage;
  67 my $url;
  68
  69 ## Grab all available snort rules and store them in the snortrules hash.
  70 #
  71 # Open snort rules directory and do a directory listing.
  72 opendir(DIR, $snortrulepath) or die $!;
  73         # Loop through the direcory.
  74         while (my $file = readdir(DIR)) {
  75
  76                 # We only want files.
  77                 next unless (-f "$snortrulepath/$file");
  78
  79                 # Ignore empty files.
  80                 next if (-z "$snortrulepath/$file");
  81
  82                 # Use a regular expression to find files ending in .rules
  83                 next unless ($file =~ m/\.rules$/);
  84
  85                 # Ignore files which are not read-able.
  86                 next unless (-R "$snortrulepath/$file");
  87
  88                 # Call subfunction to read-in rulefile and add rules to
  89                 # the snortrules hash.
  90                 &readrulesfile("$file");
  91         }
  92
  93 closedir(DIR);
  94
  95 # Save ruleset.
  96 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
  97         my $enabled_sids_file = "${General::swroot}/snort/oinkmaster-enabled-sids.conf";
  98         my $disabled_sids_file = "${General::swroot}/snort/oinkmaster-disabled-sids.conf";
  99
 100         # Arrays to store sid which should be added to the corresponding files.
 101         my @enabled_sids;
 102         my @disabled_sids;
 103
 104         # Loop through the hash of snortrules.
 105         foreach my $rulefile(keys %snortrules) {
 106                 # Loop through the single rules of the rulefile.
 107                 foreach my $sid (keys %{$snortrules{$rulefile}}) {
 108                         # Check if there exists a key in the cgiparams hash for this sid.
 109                         if (exists($cgiparams{$sid})) {
 110                                 # Look if the rule is disabled.
 111                                 if ($snortrules{$rulefile}{$sid}{'State'} eq "off") {
 112                                         # Check if the state has been set to 'on'.
 113                                         if ($cgiparams{$sid} eq "on") {
 114                                                 # Add the sid to the enabled_sids array.
 115                                                 push(@enabled_sids, $sid);
 116
 117                                                 # Drop item from cgiparams hash.
 118                                                 delete $cgiparams{$sid};
 119                                         }
 120                                 }
 121                         } else {
 122                                 # Look if the rule is enabled.
 123                                 if ($snortrules{$rulefile}{$sid}{'State'} eq "on") {
 124                                         # Check if the state is 'on' and should be disabled.
 125                                         # In this case there is no entry
 126                                         # for the sid in the cgiparams hash.
 127                                         # Add it to the disabled_sids array.
 128                                         push(@disabled_sids, $sid);
 129
 130                                         # Drop item from cgiparams hash.
 131                                         delete $cgiparams{$sid};
 132                                 }
 133                         }
 134                 }
 135         }
 136
 137         # Check if the enabled_sids array contains any sid's.
 138         if (@enabled_sids) {
 139                 # Open enabled sid's file for writing.
 140                 open(FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 141
 142                 # Write header to file.
 143                 print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 144
 145                 # Loop through the array of enabled sids and write them to the file.
 146                 foreach my $sid (@enabled_sids) {
 147                         print FILE "enable_sid $sid\n";
 148                 }
 149
 150                 # Close file after writing.
 151                 close(FILE);
 152         }
 153
 154         # Check if the enabled_sids array contains any sid's.
 155         if (@disabled_sids) {
 156                 # Open disabled sid's file for writing.
 157                 open(FILE, ">$disabled_sids_file") or die "Could not write to $disabled_sids_file. $!\n";
 158
 159                 # Write header to file.
 160                 print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 161
 162                 # Loop through the array of disabled sids and write them to the file.
 163                 foreach my $sid (@disabled_sids) {
 164                         print FILE "disable_sid $sid\n";
 165                 }
 166
 167                 # Close file after writing.
 168                 close(FILE);
 169         }
 170 }
 171
 172 if ($snortsettings{'OINKCODE'} ne "") {
 173         $errormessage = $Lang::tr{'invalid input for oink code'} unless ($snortsettings{'OINKCODE'} =~ /^[a-z0-9]+$/);
 174 }
 175
 176 if (!$errormessage) {
 177         if ($snortsettings{'RULES'} eq 'subscripted') {
 178                 $url=" https://www.snort.org/rules/snortrules-snapshot-29111.tar.gz?oinkcode=$snortsettings{'OINKCODE'}";
 179         } elsif ($snortsettings{'RULES'} eq 'registered') {
 180                 $url=" https://www.snort.org/rules/snortrules-snapshot-29111.tar.gz?oinkcode=$snortsettings{'OINKCODE'}";
 181         } elsif ($snortsettings{'RULES'} eq 'community') {
 182                 $url=" https://www.snort.org/rules/community";
 183         } else {
 184                 $url="http://rules.emergingthreats.net/open/snort-2.9.0/emerging.rules.tar.gz";
 185         }
 186
 187         if ($snortsettings{'ACTION'} eq $Lang::tr{'save'} && $snortsettings{'ACTION2'} eq "snort" ) {
 188                 &General::writehash("${General::swroot}/snort/settings", \%snortsettings);
 189                 if ($snortsettings{'ENABLE_SNORT'} eq 'on')
 190                 {
 191                         system ('/usr/bin/touch', "${General::swroot}/snort/enable");
 192                 } else {
 193                         unlink "${General::swroot}/snort/enable";
 194                 }
 195                 if ($snortsettings{'ENABLE_SNORT_GREEN'} eq 'on')
 196                 {
 197                         system ('/usr/bin/touch', "${General::swroot}/snort/enable_green");
 198                 } else {
 199                         unlink "${General::swroot}/snort/enable_green";
 200                 }
 201                 if ($snortsettings{'ENABLE_SNORT_BLUE'} eq 'on')
 202                 {
 203                         system ('/usr/bin/touch', "${General::swroot}/snort/enable_blue");
 204                 } else {
 205                         unlink "${General::swroot}/snort/enable_blue";
 206                 }
 207                 if ($snortsettings{'ENABLE_SNORT_ORANGE'} eq 'on')
 208                 {
 209                         system ('/usr/bin/touch', "${General::swroot}/snort/enable_orange");
 210                 } else {
 211                         unlink "${General::swroot}/snort/enable_orange";
 212                 }
 213                 if ($snortsettings{'ENABLE_PREPROCESSOR_HTTP_INSPECT'} eq 'on')
 214                 {
 215                         system ('/usr/bin/touch', "${General::swroot}/snort/enable_preprocessor_http_inspect");
 216                 } else {
 217                         unlink "${General::swroot}/snort/enable_preprocessor_http_inspect";
 218                 }
 219
 220                 system('/usr/local/bin/snortctrl restart >/dev/null');
 221         }
 222
 223         # INSTALLMD5 is not in the form, so not retrieved by getcgihash
 224         &General::readhash("${General::swroot}/snort/settings", \%snortsettings);
 225
 226         if ($snortsettings{'ACTION'} eq $Lang::tr{'download new ruleset'}) {
 227                 my @df = `/bin/df -B M /var`;
 228                 foreach my $line (@df) {
 229                         next if $line =~ m/^Filesystem/;
 230                         my $return;
 231
 232                         if ($line =~ m/dev/ ) {
 233                                 $line =~ m/^.* (\d+)M.*$/;
 234                                 my @temp = split(/ +/,$line);
 235                                 if ($1<300) {
 236                                         $errormessage = "$Lang::tr{'not enough disk space'} < 300MB, /var $1MB";
 237                                 } else {
 238                                         if ( $snortsettings{'ACTION'} eq $Lang::tr{'download new ruleset'}) {
 239                                                 &downloadrulesfile();
 240                                                 sleep(3);
 241                                                 $return = `cat /var/tmp/log 2>/dev/null`;
 242
 243                                         }
 244
 245                                         if ($return =~ "ERROR") {
 246                                                 $errormessage = "<br /><pre>".$return."</pre>";
 247                                         } else {
 248                                                 system("/usr/local/bin/oinkmaster.pl -v -s -u file:///var/tmp/snortrules.tar.gz -C /var/ipfire/snort/oinkmaster.conf -o /etc/snort/rules >>/var/tmp/log 2>&1 &");
 249                                                 sleep(2);
 250                                         }
 251                                 }
 252                         }
 253                 }
 254         }
 255 }
 256
 257 $checked{'ENABLE_SNORT'}{'off'} = '';
 258 $checked{'ENABLE_SNORT'}{'on'} = '';
 259 $checked{'ENABLE_SNORT'}{$snortsettings{'ENABLE_SNORT'}} = "checked='checked'";
 260 $checked{'ENABLE_SNORT_GREEN'}{'off'} = '';
 261 $checked{'ENABLE_SNORT_GREEN'}{'on'} = '';
 262 $checked{'ENABLE_SNORT_GREEN'}{$snortsettings{'ENABLE_SNORT_GREEN'}} = "checked='checked'";
 263 $checked{'ENABLE_SNORT_BLUE'}{'off'} = '';
 264 $checked{'ENABLE_SNORT_BLUE'}{'on'} = '';
 265 $checked{'ENABLE_SNORT_BLUE'}{$snortsettings{'ENABLE_SNORT_BLUE'}} = "checked='checked'";
 266 $checked{'ENABLE_SNORT_ORANGE'}{'off'} = '';
 267 $checked{'ENABLE_SNORT_ORANGE'}{'on'} = '';
 268 $checked{'ENABLE_SNORT_ORANGE'}{$snortsettings{'ENABLE_SNORT_ORANGE'}} = "checked='checked'";
 269 $selected{'RULES'}{'nothing'} = '';
 270 $selected{'RULES'}{'community'} = '';
 271 $selected{'RULES'}{'emerging'} = '';
 272 $selected{'RULES'}{'registered'} = '';
 273 $selected{'RULES'}{'subscripted'} = '';
 274 $selected{'RULES'}{$snortsettings{'RULES'}} = "selected='selected'";
 275
 276 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 277
 278 ### Java Script ###
 279 print <<END
 280 <script>
 281         // Tiny java script function to show/hide the rules
 282         // of a given category.
 283         function showhide(tblname) {
 284                 \$("#" + tblname).toggle();
 285         }
 286 </script>
 287 END
 288 ;
 289
 290 &Header::openbigbox('100%', 'left', '', $errormessage);
 291
 292 ###############
 293 # DEBUG DEBUG
 294 # &Header::openbox('100%', 'left', 'DEBUG');
 295 # my $debugCount = 0;
 296 # foreach my $line (sort keys %snortsettings) {
 297 # print "$line = $snortsettings{$line}<br />\n";
 298 # $debugCount++;
 299 # }
 300 # print "&nbsp;Count: $debugCount\n";
 301 # &Header::closebox();
 302 # DEBUG DEBUG
 303 ###############
 304
 305 if ($errormessage) {
 306         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 307         print "<class name='base'>$errormessage\n";
 308         print "&nbsp;</class>\n";
 309         &Header::closebox();
 310 }
 311
 312 my $return = `pidof oinkmaster.pl -x`;
 313 chomp($return);
 314 if ($return) {
 315         &Header::openbox( 'Waiting', 1, "<meta http-equiv='refresh' content='10;'>" );
 316         print <<END;
 317         <table>
 318                 <tr><td>
 319                                 <img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' />&nbsp;
 320                         <td>
 321                                 $Lang::tr{'snort working'}
 322                 <tr><td colspan='2' align='center'>
 323                         <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 324                                 <input type='image' alt='$Lang::tr{'reload'}' title='$Lang::tr{'reload'}' src='/images/view-refresh.png' />
 325                         </form>
 326                 <tr><td colspan='2' align='left'><pre>
 327 END
 328         my @output = `tail -20 /var/tmp/log`;
 329         foreach (@output) {
 330                 print "$_";
 331         }
 332         print <<END;
 333                         </pre>
 334                 </table>
 335 END
 336         &Header::closebox();
 337         &Header::closebigbox();
 338         &Header::closepage();
 339         exit;
 340         refreshpage();
 341 }
 342
 343 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 344 print <<END
 345 <form method='post' action='$ENV{'SCRIPT_NAME'}'><table width='100%'>
 346 <tr><td class='base'><input type='checkbox' name='ENABLE_SNORT_GREEN' $checked{'ENABLE_SNORT_GREEN'}{'on'} />GREEN Snort
 347 END
 348 ;
 349 if ($netsettings{'BLUE_DEV'} ne '') {
 350   print "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type='checkbox' name='ENABLE_SNORT_BLUE' $checked{'ENABLE_SNORT_BLUE'}{'on'} />   BLUE Snort";
 351 }
 352 if ($netsettings{'ORANGE_DEV'} ne '') {
 353   print "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type='checkbox' name='ENABLE_SNORT_ORANGE' $checked{'ENABLE_SNORT_ORANGE'}{'on'} />   ORANGE Snort";
 354 }
 355   print "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type='checkbox' name='ENABLE_SNORT' $checked{'ENABLE_SNORT'}{'on'} />   RED Snort";
 356
 357 print <<END
 358 </td></tr>
 359 <tr>
 360         <td><br><br></td>
 361 </tr>
 362 <tr>
 363         <td><b>$Lang::tr{'ids rules update'}</b></td>
 364 </tr>
 365 <tr>
 366         <td><select name='RULES'>
 367                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 368                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 369                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 370                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 371                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 372                         </select>
 373         </td>
 374 </tr>
 375 <tr>
 376         <td><br />
 377                 $Lang::tr{'ids rules license'} <a href='https://www.snort.org/subscribe' target='_blank'>www.snort.org</a>$Lang::tr{'ids rules license1'}<br /><br />
 378                 $Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}
 379         </td>
 380 </tr>
 381 <tr>
 382         <td nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$snortsettings{'OINKCODE'}' /></td>
 383 </tr>
 384 <tr>
 385         <td width='30%' align='left'><br><input type='submit' name='ACTION' value='$Lang::tr{'download new ruleset'}' />
 386 END
 387 ;
 388 if ( -e "/var/tmp/snortrules.tar.gz"){
 389         my @Info = stat("/var/tmp/snortrules.tar.gz");
 390         $snortsettings{'INSTALLDATE'} = localtime($Info[9]);
 391 }
 392 print "&nbsp;$Lang::tr{'updates installed'}: $snortsettings{'INSTALLDATE'}</td>";
 393
 394 print <<END
 395 </tr>
 396 </table>
 397 <br><br>
 398 <table width='100%'>
 399 <tr>
 400         <td align='right'><input type='hidden' name='ACTION2' value='snort' /><input type='submit' name='ACTION' value='$Lang::tr{'save'}' /></td>
 401 </tr>
 402 </table>
 403 </form>
 404 END
 405 ;
 406
 407 &Header::closebox();
 408
 409 &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 410         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 411
 412         # Output display table for rule files
 413         print "<table width='100%'>\n";
 414
 415         # Local variable required for java script to show/hide
 416         # rules of a rulefile.
 417         my $rulesetcount = 1;
 418
 419         # Loop over each rule file
 420         foreach my $rulefile (sort keys(%snortrules)) {
 421                 my $rulechecked = '';
 422
 423                 # Check if rule file is enabled
 424                 if ($snortrules{$rulefile}{"State"} eq 'On') {
 425                         $rulechecked = 'CHECKED';
 426                 }
 427
 428                 # Table and rows for the rule files.
 429                 print"<tr>\n";
 430                 print"<td class='base' width='5%'>\n";
 431                 print"<input type='checkbox' name='SNORT_RULE_$rulefile' $rulechecked>\n";
 432                 print"</td>\n";
 433                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 434                 print"<td class='base' width='5%' align='right'>\n";
 435                 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 436                 print"</td>\n";
 437                 print"</tr>\n";
 438
 439                 # Rows which will be hidden per default and will contain the single rules.
 440                 print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 441                 print"<td colspan='3'>\n";
 442
 443                 # Local vars
 444                 my $lines;
 445                 my $rows;
 446                 my $col;
 447
 448                 # New table for the single rules.
 449                 print "<table width='100%'>\n";
 450
 451                 # Loop over rule file rules
 452                 foreach my $sid (sort {$a <=> $b} keys(%{$snortrules{$rulefile}})) {
 453                         # Local vars
 454                         my $ruledefchecked = '';
 455
 456                         # If 2 rules have been displayed, start a new row
 457                         if (($lines % 2) == 0) {
 458                                 print "</tr><tr>\n";
 459
 460                                 # Increase rows by once.
 461                                 $rows++;
 462                         }
 463
 464                         # Colour lines.
 465                         if ($rows % 2) {
 466                                 $col="bgcolor='$color{'color20'}'";
 467                         } else {
 468                                 $col="bgcolor='$color{'color22'}'";
 469                         }
 470
 471                         # Set rule state
 472                         if ($snortrules{$rulefile}{$sid}{'State'} eq 'on') {
 473                                 $ruledefchecked = 'CHECKED';
 474                         }
 475
 476                         # Create rule checkbox and display rule description
 477                         print "<td class='base' width='5%' align='right' $col>\n";
 478                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 479                         print "</td>\n";
 480                         print "<td class='base' width='45%' $col>$snortrules{$rulefile}{$sid}{'Description'}</td>";
 481
 482                         # Increment rule count
 483                         $lines++;
 484                 }
 485
 486                 # If do not have a second rule for row, create empty cell
 487                 if (($lines % 2) != 0) {
 488                         print "<td class='base'></td>";
 489                 }
 490
 491                 # Close display table
 492                 print "</tr></table></td></tr>";
 493
 494                 # Finished whith the rule file, increase count.
 495                 $rulesetcount++;
 496         }
 497
 498         # Close display table
 499         print "</table>";
 500
 501 print <<END
 502 <table width='100%'>
 503 <tr>
 504         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 505                 &nbsp; <!-- space for future online help link -->
 506         </td>
 507 </tr>
 508 </table>
 509 </form>
 510 END
 511 ;
 512 &Header::closebox();
 513
 514 &Header::closebigbox();
 515 &Header::closepage();
 516
 517 sub refreshpage {
 518         &Header::openbox( 'Waiting', 1, "<meta http-equiv='refresh' content='1;'>" );
 519                 print "<center><img src='/images/clock.gif' alt='' /><br/><font color='red'>$Lang::tr{'pagerefresh'}</font></center>";
 520         &Header::closebox();
 521 }
 522
 523 sub downloadrulesfile {
 524         my $peer;
 525         my $peerport;
 526
 527         unlink("/var/tmp/log");
 528
 529         unless (-e "${General::swroot}/red/active") {
 530                 $errormessage = $Lang::tr{'could not download latest updates'};
 531                 return undef;
 532         }
 533
 534         my %proxysettings=();
 535         &General::readhash("${General::swroot}/proxy/settings", \%proxysettings);
 536
 537         if ($_=$proxysettings{'UPSTREAM_PROXY'}) {
 538                 ($peer, $peerport) = (/^(?:[a-zA-Z ]+\:\/\/)?(?:[A-Za-z0-9\_\.\-]*?(?:\:[A-Za-z0-9\_\.\-]*?)?\@)?([a-zA-Z0-9\.\_\-]*?)(?:\:([0-9]{1,5}))?(?:\/.*?)?$/);
 539         }
 540
 541         if ($peer) {
 542                 system("wget -r --proxy=on --proxy-user=$proxysettings{'UPSTREAM_USER'} --proxy-passwd=$proxysettings{'UPSTREAM_PASSWORD'} -e http_proxy=http://$peer:$peerport/ -o /var/tmp/log --output-document=/var/tmp/snortrules.tar.gz $url");
 543         } else {
 544                 system("wget -r -o /var/tmp/log --output-document=/var/tmp/snortrules.tar.gz $url");
 545         }
 546 }
 547
 548 sub readrulesfile ($) {
 549         my $rulefile = shift;
 550
 551         # Open rule file and read in contents
 552         open(RULEFILE, "$snortrulepath/$rulefile") or die "Unable to read $rulefile!";
 553
 554         # Store file content in an array.
 555         my @lines = <RULEFILE>;
 556
 557         # Close file.
 558         close(RULEFILE);
 559
 560         # Loop over rule file contents
 561         foreach my $line (@lines) {
 562                 # Remove whitespaces.
 563                 chomp $line;
 564
 565                 # Skip blank  lines.
 566                 next if ($line =~ /^\s*$/);
 567
 568                 # Local vars.
 569                 my $sid;
 570                 my $msg;
 571
 572                 # Gather rule sid and message from the ruleline.
 573                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 574                         $msg = $1;
 575                         $sid = $2;
 576
 577                         # Check if a rule has been found.
 578                         if ($sid && $msg) {
 579                                 # Add rule to the snortrules hash.
 580                                 $snortrules{$rulefile}{$sid}{'Description'} = $msg;
 581
 582                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 583                                 if ($line =~ /^\#/) {
 584                                         # If yes, the rule is disabled.
 585                                         $snortrules{$rulefile}{$sid}{'State'} = "off";
 586                                 } else {
 587                                         # Otherwise the rule is enabled.
 588                                         $snortrules{$rulefile}{$sid}{'State'} = "on";
 589                                 }
 590                         }
 591                 }
 592         }
 593 }