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 my $idsusedrulefilesfile = "$IDS::settingsdir/suricata-used-rulefiles.yaml";
  51 my $errormessage;
  52
  53 &Header::showhttpheaders();
  54
  55 #Get GUI values
  56 &Header::getcgihash(\%cgiparams);
  57
  58 # Check if any error has been stored.
  59 if (-e $IDS::storederrorfile) {
  60         # Open file to read in the stored error message.
  61         open(FILE, "<$IDS::storederrorfile") or die "Could not open $IDS::storederrorfile. $!\n";
  62
  63         # Read the stored error message.
  64         $errormessage = <FILE>;
  65
  66         # Close file.
  67         close (FILE);
  68
  69         # Delete the file, which is now not longer required.
  70         unlink($IDS::storederrorfile);
  71 }
  72
  73
  74 ## Grab all available snort rules and store them in the idsrules hash.
  75 #
  76 # Open snort rules directory and do a directory listing.
  77 opendir(DIR, $IDS::rulespath) or die $!;
  78         # Loop through the direcory.
  79         while (my $file = readdir(DIR)) {
  80
  81                 # We only want files.
  82                 next unless (-f "$IDS::rulespath/$file");
  83
  84                 # Ignore empty files.
  85                 next if (-z "$IDS::rulespath/$file");
  86
  87                 # Use a regular expression to find files ending in .rules
  88                 next unless ($file =~ m/\.rules$/);
  89
  90                 # Ignore files which are not read-able.
  91                 next unless (-R "$IDS::rulespath/$file");
  92
  93                 # Call subfunction to read-in rulefile and add rules to
  94                 # the idsrules hash.
  95                 &readrulesfile("$file");
  96         }
  97
  98 closedir(DIR);
  99
 100 # Gather used rulefiles.
 101 #
 102 # Check if the file for activated rulefiles is not empty.
 103 if(-f $idsusedrulefilesfile) {
 104         # Open the file for used rulefile and read-in content.
 105         open(FILE, $idsusedrulefilesfile) or die "Could not open $idsusedrulefilesfile. $!\n";
 106
 107         # Read-in content.
 108         my @lines = <FILE>;
 109
 110         # Close file.
 111         close(FILE);
 112
 113         # Loop through the array.
 114         foreach my $line (@lines) {
 115                 # Remove newlines.
 116                 chomp($line);
 117
 118                 # Skip comments.
 119                 next if ($line =~ /\#/);
 120
 121                 # Skip blank  lines.
 122                 next if ($line =~ /^\s*$/);
 123
 124                 # Gather rule sid and message from the ruleline.
 125                 if ($line =~ /.*- (.*)/) {
 126                         my $rulefile = $1;
 127
 128                         # Add the rulefile to the %idsrules hash.
 129                         $idsrules{$rulefile}{'Rulefile'}{'State'} = "on";
 130                 }
 131         }
 132 }
 133
 134 # Save ruleset.
 135 if ($cgiparams{'RULESET'} eq $Lang::tr{'update'}) {
 136         my $enabled_sids_file = "$IDS::settingsdir/oinkmaster-enabled-sids.conf";
 137         my $disabled_sids_file = "$IDS::settingsdir/oinkmaster-disabled-sids.conf";
 138
 139         # Arrays to store sid which should be added to the corresponding files.
 140         my @enabled_sids;
 141         my @disabled_sids;
 142         my @enabled_rulefiles;
 143
 144         # Loop through the hash of idsrules.
 145         foreach my $rulefile(keys %idsrules) {
 146                 # Check if the rulefile is enabled.
 147                 if ($cgiparams{$rulefile} eq "on") {
 148                         # Add rulefile to the array of enabled rulefiles.
 149                         push(@enabled_rulefiles, $rulefile);
 150
 151                         # Drop item from cgiparams hash.
 152                         delete $cgiparams{$rulefile};
 153                 }
 154         }
 155
 156         # Loop through the hash of idsrules.
 157         foreach my $rulefile (keys %idsrules) {
 158                 # Loop through the single rules of the rulefile.
 159                 foreach my $sid (keys %{$idsrules{$rulefile}}) {
 160                         # Skip the current sid if it is not numeric.
 161                         next unless ($sid =~ /\d+/ );
 162
 163                         # Check if there exists a key in the cgiparams hash for this sid.
 164                         if (exists($cgiparams{$sid})) {
 165                                 # Look if the rule is disabled.
 166                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "off") {
 167                                         # Check if the state has been set to 'on'.
 168                                         if ($cgiparams{$sid} eq "on") {
 169                                                 # Add the sid to the enabled_sids array.
 170                                                 push(@enabled_sids, $sid);
 171
 172                                                 # Drop item from cgiparams hash.
 173                                                 delete $cgiparams{$rulefile}{$sid};
 174                                         }
 175                                 }
 176                         } else {
 177                                 # Look if the rule is enabled.
 178                                 if ($idsrules{$rulefile}{$sid}{'State'} eq "on") {
 179                                         # Check if the state is 'on' and should be disabled.
 180                                         # In this case there is no entry
 181                                         # for the sid in the cgiparams hash.
 182                                         # Add it to the disabled_sids array.
 183                                         push(@disabled_sids, $sid);
 184
 185                                         # Drop item from cgiparams hash.
 186                                         delete $cgiparams{$rulefile}{$sid};
 187                                 }
 188                         }
 189                 }
 190         }
 191
 192         # Open enabled sid's file for writing.
 193         open(FILE, ">$enabled_sids_file") or die "Could not write to $enabled_sids_file. $!\n";
 194
 195         # Write header to file.
 196         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 197
 198         # Check if the enabled_sids array contains any sid's.
 199         if (@enabled_sids) {
 200                 # Loop through the array of enabled sids and write them to the file.
 201                 foreach my $sid (@enabled_sids) {
 202                         print FILE "enablesid $sid\n";
 203                 }
 204         }
 205
 206         # Close file after writing.
 207         close(FILE);
 208
 209         # Open disabled sid's file for writing.
 210         open(FILE, ">$disabled_sids_file") or die "Could not write to $disabled_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 (@disabled_sids) {
 217                 # Loop through the array of disabled sids and write them to the file.
 218                 foreach my $sid (@disabled_sids) {
 219                         print FILE "disablesid $sid\n";
 220                 }
 221         }
 222
 223         # Close file after writing.
 224         close(FILE);
 225
 226         # Open file for used rulefiles.
 227         open (FILE, ">$idsusedrulefilesfile") or die "Could not write to $idsusedrulefilesfile. $!\n";
 228
 229         # Write yaml header to the file.
 230         print FILE "%YAML 1.1\n";
 231         print FILE "---\n\n";
 232
 233         # Write header to file.
 234         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 235
 236         # Check if the enabled_rulefiles array contains any entries.
 237         if (@enabled_rulefiles) {
 238                 # Loop through the array of rulefiles which should be loaded and write the to the file.
 239                 foreach my $file (@enabled_rulefiles) {
 240                         print FILE " - $file\n";
 241                 }
 242         }
 243
 244         # Close file after writing.
 245         close(FILE);
 246
 247         # Lock the webpage and print message.
 248         &working_notice("$Lang::tr{'snort working'}");
 249
 250         # Call oinkmaster to alter the ruleset.
 251         &IDS::oinkmaster();
 252
 253         # Reload page.
 254         &reload();
 255
 256 # Download new ruleset.
 257 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 258         # Check if the red device is active.
 259         unless (-e "${General::swroot}/red/active") {
 260                 $errormessage = $Lang::tr{'could not download latest updates'};
 261         }
 262
 263         # Check if enought free disk space is availabe.
 264         if(&IDS::checkdiskspace()) {
 265                 $errormessage = "$Lang::tr{'not enough disk space'}";
 266         }
 267
 268         # Check if any errors happend.
 269         unless ($errormessage) {
 270                 # Lock the webpage and print notice about downloading
 271                 # a new ruleset.
 272                 &working_notice("$Lang::tr{'snort working'}");
 273
 274                 # Call subfunction to download the ruleset.
 275                 if(&IDS::downloadruleset()) {
 276                         $errormessage = $Lang::tr{'could not download latest updates'};
 277
 278                         # Call function to store the errormessage.
 279                         &IDS::_store_error_message($errormessage);
 280
 281                         # Preform a reload of the page.
 282                         &reload();
 283                 } else {
 284                         # Call subfunction to launch oinkmaster.
 285                         &IDS::oinkmaster();
 286
 287                         # Perform a reload of the page.
 288                         &reload();
 289                 }
 290         }
 291 # Save snort settings.
 292 } elsif ($cgiparams{'SNORT'} eq $Lang::tr{'save'}) {
 293         # Prevent form name from been stored in conf file.
 294         delete $cgiparams{'SNORT'};
 295
 296         # Check if an oinkcode has been provided.
 297         if ($cgiparams{'OINKCODE'}) {
 298                 # Check if the oinkcode contains unallowed chars.
 299                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 300                         $errormessage = $Lang::tr{'invalid input for oink code'};
 301                 }
 302         }
 303
 304         # Go on if there are no error messages.
 305         if (!$errormessage) {
 306                 # Store settings into settings file.
 307                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 308
 309                 # Call suricatactrl to restart the IDS
 310                 system('/usr/local/bin/suricatactrl restart >/dev/null');
 311         }
 312 }
 313
 314 # Read-in idssettings
 315 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 316
 317 $checked{'ENABLE_IDS'}{'off'} = '';
 318 $checked{'ENABLE_IDS'}{'on'} = '';
 319 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 320 $selected{'RULES'}{'nothing'} = '';
 321 $selected{'RULES'}{'community'} = '';
 322 $selected{'RULES'}{'emerging'} = '';
 323 $selected{'RULES'}{'registered'} = '';
 324 $selected{'RULES'}{'subscripted'} = '';
 325 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 326
 327 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 328
 329 ### Java Script ###
 330 print <<END
 331 <script>
 332         // Tiny java script function to show/hide the rules
 333         // of a given category.
 334         function showhide(tblname) {
 335                 \$("#" + tblname).toggle();
 336         }
 337 </script>
 338 END
 339 ;
 340
 341 &Header::openbigbox('100%', 'left', '', $errormessage);
 342
 343 if ($errormessage) {
 344         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 345         print "<class name='base'>$errormessage\n";
 346         print "&nbsp;</class>\n";
 347         &Header::closebox();
 348 }
 349
 350 # Draw current state of the IDS
 351 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 352
 353 # Check if the IDS is running and obtain the process-id.
 354 my $pid = &IDS::ids_is_running();
 355
 356 # Display some useful information, if suricata daemon is running.
 357 if ($pid) {
 358         # Gather used memory.
 359         my $memory = &get_memory_usage($pid);
 360
 361         print <<END;
 362                 <table width='95%' cellspacing='0' class='tbl'>
 363                         <tr>
 364                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 365                         </tr>
 366
 367                         <tr>
 368                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 369                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 370                         </tr>
 371
 372                         <tr>
 373                                 <td class='base'></td>
 374                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 375                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 376                         </tr>
 377
 378                         <tr>
 379                                 <td class='base'></td>
 380                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 381                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 382                         </tr>
 383                 </table>
 384 END
 385 } else {
 386         # Otherwise display a hint that the service is not launched.
 387         print <<END;
 388                 <table width='95%' cellspacing='0' class='tbl'>
 389                         <tr>
 390                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 391                         </tr>
 392
 393                         <tr>
 394                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 395                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 396                         </tr>
 397                 </table>
 398
 399                 <br>br>
 400 END
 401 }
 402 &Header::closebox();
 403
 404 # Draw elements for IDS configuration.
 405 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 406
 407 my $rulesdate;
 408
 409 # Check if a ruleset allready has been downloaded.
 410 if ( -f "$IDS::rulestarball"){
 411         # Call stat on the filename to obtain detailed information.
 412         my @Info = stat("$IDS::rulestarball");
 413
 414         # Grab details about the creation time.
 415         $rulesdate = localtime($Info[9]);
 416 }
 417
 418 print <<END
 419 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 420         <table width='100%' border='0'>
 421                 <tr>
 422                         <td class='base' width='25%'>
 423                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 424                         </td>
 425
 426                         <td class='base' width='25%'>
 427                                 &nbsp
 428                         </td>
 429                 </tr>
 430
 431                 <tr>
 432                         <td colspan='2'><br><br>
 433                 </tr>
 434
 435                 <tr>
 436                         <td class='base' width='25%'>
 437                                 <b>$Lang::tr{'ids analyze incomming traffic'}</b>
 438                         </td>
 439
 440                         <td class='base' width='25%'>
 441                                 <b>$Lang::tr{'ids analyze routing traffic'}</b>
 442                         </td>
 443                 </tr>
 444 END
 445 ;
 446
 447 # Loop through the array of available networks and print config options.
 448 foreach my $zone (@network_zones) {
 449         my $checked_input;
 450         my $checked_forward;
 451
 452         # Convert current zone name to upper case.
 453         my $zone_upper = uc($zone);
 454
 455         # Grab checkbox status from settings hash.
 456         if ($idssettings{"ENABLE_IDS_INPUT_$zone_upper"} eq "on") {
 457                 $checked_input = "checked = 'checked'";
 458         }
 459
 460         # Do the same for the forward setting.
 461         if ($idssettings{"ENABLE_IDS_FORWARD_$zone_upper"} eq "on") {
 462                 $checked_forward = "checked = 'checked'";
 463         }
 464
 465         print "<tr>\n";
 466         print "<td class='base' width='25%'>\n";
 467         print "<input type='checkbox' name='ENABLE_IDS_INPUT_$zone_upper' $checked_input>$Lang::tr{'ids active on'} $Lang::tr{$zone}\n";
 468         print "</td>\n";
 469
 470         print "<td class='base' width='25%'>\n";
 471         print "<input type='checkbox' name='ENABLE_IDS_FORWARD_$zone_upper' $checked_forward>$Lang::tr{'ids active on'} $Lang::tr{$zone}\n";
 472         print "</td>\n";
 473         print "</tr>\n";
 474 }
 475
 476 print <<END
 477                 </tr>
 478
 479                 <tr>
 480                         <td colspan='4'><br><br></td>
 481                 </tr>
 482
 483                 <tr>
 484                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 485                 </tr>
 486
 487                 <tr>
 488                         <td colspan='4'><select name='RULES'>
 489                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 490                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 491                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 492                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 493                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 494                         </select>
 495                         </td>
 496                 </tr>
 497
 498                 <tr>
 499                         <td colspan='4'>
 500                                 <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>
 501                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 502                         </td>
 503                 </tr>
 504
 505                 <tr>
 506                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 507                 </tr>
 508
 509                 <tr>
 510                         <td colspan='4' align='left'><br>
 511                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 512                         </td>
 513
 514                 </tr>
 515         </table>
 516
 517         <br><br>
 518
 519         <table width='100%'>
 520                 <tr>
 521                         <td align='right'><input type='submit' name='SNORT' value='$Lang::tr{'save'}' /></td>
 522                 </tr>
 523         </table>
 524 </form>
 525 END
 526 ;
 527
 528 &Header::closebox();
 529
 530 &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 531         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 532
 533         # Output display table for rule files
 534         print "<table width='100%'>\n";
 535
 536         # Local variable required for java script to show/hide
 537         # rules of a rulefile.
 538         my $rulesetcount = 1;
 539
 540         # Loop over each rule file
 541         foreach my $rulefile (sort keys(%idsrules)) {
 542                 my $rulechecked = '';
 543
 544                 # Check if rule file is enabled
 545                 if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 546                         $rulechecked = 'CHECKED';
 547                 }
 548
 549                 # Table and rows for the rule files.
 550                 print"<tr>\n";
 551                 print"<td class='base' width='5%'>\n";
 552                 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 553                 print"</td>\n";
 554                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 555                 print"<td class='base' width='5%' align='right'>\n";
 556                 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 557                 print"</td>\n";
 558                 print"</tr>\n";
 559
 560                 # Rows which will be hidden per default and will contain the single rules.
 561                 print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 562                 print"<td colspan='3'>\n";
 563
 564                 # Local vars
 565                 my $lines;
 566                 my $rows;
 567                 my $col;
 568
 569                 # New table for the single rules.
 570                 print "<table width='100%'>\n";
 571
 572                 # Loop over rule file rules
 573                 foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 574                         # Local vars
 575                         my $ruledefchecked = '';
 576
 577                         # Skip rulefile itself.
 578                         next if ($sid eq "Rulefile");
 579
 580                         # If 2 rules have been displayed, start a new row
 581                         if (($lines % 2) == 0) {
 582                                 print "</tr><tr>\n";
 583
 584                                 # Increase rows by once.
 585                                 $rows++;
 586                         }
 587
 588                         # Colour lines.
 589                         if ($rows % 2) {
 590                                 $col="bgcolor='$color{'color20'}'";
 591                         } else {
 592                                 $col="bgcolor='$color{'color22'}'";
 593                         }
 594
 595                         # Set rule state
 596                         if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 597                                 $ruledefchecked = 'CHECKED';
 598                         }
 599
 600                         # Create rule checkbox and display rule description
 601                         print "<td class='base' width='5%' align='right' $col>\n";
 602                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 603                         print "</td>\n";
 604                         print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
 605
 606                         # Increment rule count
 607                         $lines++;
 608                 }
 609
 610                 # If do not have a second rule for row, create empty cell
 611                 if (($lines % 2) != 0) {
 612                         print "<td class='base'></td>";
 613                 }
 614
 615                 # Close display table
 616                 print "</tr></table></td></tr>";
 617
 618                 # Finished whith the rule file, increase count.
 619                 $rulesetcount++;
 620         }
 621
 622         # Close display table
 623         print "</table>";
 624
 625 print <<END
 626 <table width='100%'>
 627 <tr>
 628         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 629                 &nbsp; <!-- space for future online help link -->
 630         </td>
 631 </tr>
 632 </table>
 633 </form>
 634 END
 635 ;
 636 &Header::closebox();
 637 &Header::closebigbox();
 638 &Header::closepage();
 639
 640 #
 641 ## A function to display a notice, to lock the webpage and
 642 ## tell the user which action currently will be performed.
 643 #
 644 sub working_notice ($) {
 645         my ($message) = @_;
 646
 647         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 648         &Header::openbigbox('100%', 'left', '', $errormessage);
 649         &Header::openbox( 'Waiting', 1,);
 650                 print <<END;
 651                         <table>
 652                                 <tr>
 653                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
 654                                         <td>$message</td>
 655                                 </tr>
 656                         </table>
 657 END
 658         &Header::closebox();
 659         &Header::closebigbox();
 660         &Header::closepage();
 661 }
 662
 663 #
 664 ## A tiny function to perform a reload of the webpage after one second.
 665 #
 666 sub reload () {
 667         print "<meta http-equiv='refresh' content='1'>\n";
 668
 669         # Stop the script.
 670         exit;
 671 }
 672
 673 #
 674 ## Private function to read-in and parse rules of a given rulefile.
 675 #
 676 ## The given file will be read, parsed and all valid rules will be stored by ID,
 677 ## message/description and it's state in the idsrules hash.
 678 #
 679 sub readrulesfile ($) {
 680         my $rulefile = shift;
 681
 682         # Open rule file and read in contents
 683         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
 684
 685         # Store file content in an array.
 686         my @lines = <RULEFILE>;
 687
 688         # Close file.
 689         close(RULEFILE);
 690
 691         # Loop over rule file contents
 692         foreach my $line (@lines) {
 693                 # Remove whitespaces.
 694                 chomp $line;
 695
 696                 # Skip blank  lines.
 697                 next if ($line =~ /^\s*$/);
 698
 699                 # Local vars.
 700                 my $sid;
 701                 my $msg;
 702
 703                 # Gather rule sid and message from the ruleline.
 704                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 705                         $msg = $1;
 706                         $sid = $2;
 707
 708                         # Check if a rule has been found.
 709                         if ($sid && $msg) {
 710                                 # Add rule to the idsrules hash.
 711                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
 712
 713                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 714                                 if ($line =~ /^\#/) {
 715                                         # If yes, the rule is disabled.
 716                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
 717                                 } else {
 718                                         # Otherwise the rule is enabled.
 719                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
 720                                 }
 721                         }
 722                 }
 723         }
 724 }
 725
 726 # Function to get the used memory of a given process-id.
 727 sub get_memory_usage($) {
 728         my $pid = @_;
 729
 730         my $memory=0;
 731
 732         # Try to open statm file for the given process-id on the pseudo
 733         # file system proc.
 734         if (open(FILE, "/proc/$pid/statm")) {
 735                 # Read file content.
 736                 my $temp = <FILE>;
 737
 738                 # Splitt file content and store in an array.
 739                 my @memory = split(/ /,$temp);
 740
 741                 # Close file handle.
 742                 close(FILE);
 743
 744                 # Calculate memory usage.
 745                 $memory+=$memory[0];
 746
 747                 # Return memory usage.
 748                 return $memory;
 749         }
 750
 751         # If the file could not be open, return nothing.
 752         return;
 753 }
 754