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         # Reload page.
 259         &reload();
 260
 261 # Download new ruleset.
 262 } elsif ($cgiparams{'RULESET'} eq $Lang::tr{'download new ruleset'}) {
 263         # Check if the red device is active.
 264         unless (-e "${General::swroot}/red/active") {
 265                 $errormessage = $Lang::tr{'could not download latest updates'};
 266         }
 267
 268         # Check if enought free disk space is availabe.
 269         if(&IDS::checkdiskspace()) {
 270                 $errormessage = "$Lang::tr{'not enough disk space'}";
 271         }
 272
 273         # Check if any errors happend.
 274         unless ($errormessage) {
 275                 # Lock the webpage and print notice about downloading
 276                 # a new ruleset.
 277                 &working_notice("$Lang::tr{'snort working'}");
 278
 279                 # Call subfunction to download the ruleset.
 280                 if(&IDS::downloadruleset()) {
 281                         $errormessage = $Lang::tr{'could not download latest updates'};
 282
 283                         # Call function to store the errormessage.
 284                         &IDS::_store_error_message($errormessage);
 285
 286                         # Preform a reload of the page.
 287                         &reload();
 288                 } else {
 289                         # Call subfunction to launch oinkmaster.
 290                         &IDS::oinkmaster();
 291
 292                         # Perform a reload of the page.
 293                         &reload();
 294                 }
 295         }
 296 # Save snort settings.
 297 } elsif ($cgiparams{'IDS'} eq $Lang::tr{'save'}) {
 298         # Prevent form name from been stored in conf file.
 299         delete $cgiparams{'IDS'};
 300
 301         # Check if an oinkcode has been provided.
 302         if ($cgiparams{'OINKCODE'}) {
 303                 # Check if the oinkcode contains unallowed chars.
 304                 unless ($cgiparams{'OINKCODE'} =~ /^[a-z0-9]+$/) {
 305                         $errormessage = $Lang::tr{'invalid input for oink code'};
 306                 }
 307         }
 308
 309         # Go on if there are no error messages.
 310         if (!$errormessage) {
 311                 # Store settings into settings file.
 312                 &General::writehash("$IDS::settingsdir/settings", \%cgiparams);
 313         }
 314
 315         # Generate file to store the home net.
 316         &generate_home_net_file();
 317 }
 318
 319 # Read-in idssettings
 320 &General::readhash("$IDS::settingsdir/settings", \%idssettings);
 321
 322 $checked{'ENABLE_IDS'}{'off'} = '';
 323 $checked{'ENABLE_IDS'}{'on'} = '';
 324 $checked{'ENABLE_IDS'}{$idssettings{'ENABLE_IDS'}} = "checked='checked'";
 325 $selected{'RULES'}{'nothing'} = '';
 326 $selected{'RULES'}{'community'} = '';
 327 $selected{'RULES'}{'emerging'} = '';
 328 $selected{'RULES'}{'registered'} = '';
 329 $selected{'RULES'}{'subscripted'} = '';
 330 $selected{'RULES'}{$idssettings{'RULES'}} = "selected='selected'";
 331
 332 &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 333
 334 ### Java Script ###
 335 print <<END
 336 <script>
 337         // Tiny java script function to show/hide the rules
 338         // of a given category.
 339         function showhide(tblname) {
 340                 \$("#" + tblname).toggle();
 341         }
 342 </script>
 343 END
 344 ;
 345
 346 &Header::openbigbox('100%', 'left', '', $errormessage);
 347
 348 if ($errormessage) {
 349         &Header::openbox('100%', 'left', $Lang::tr{'error messages'});
 350         print "<class name='base'>$errormessage\n";
 351         print "&nbsp;</class>\n";
 352         &Header::closebox();
 353 }
 354
 355 # Draw current state of the IDS
 356 &Header::openbox('100%', 'left', $Lang::tr{'intrusion detection system'});
 357
 358 # Check if the IDS is running and obtain the process-id.
 359 my $pid = &IDS::ids_is_running();
 360
 361 # Display some useful information, if suricata daemon is running.
 362 if ($pid) {
 363         # Gather used memory.
 364         my $memory = &get_memory_usage($pid);
 365
 366         print <<END;
 367                 <table width='95%' cellspacing='0' class='tbl'>
 368                         <tr>
 369                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 370                         </tr>
 371
 372                         <tr>
 373                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 374                                 <td align='center' colspan='2' width='75%' bgcolor='${Header::colourgreen}'><font color='white'><strong>$Lang::tr{'running'}</strong></font></td>
 375                         </tr>
 376
 377                         <tr>
 378                                 <td class='base'></td>
 379                                 <td bgcolor='$color{'color20'}' align='center'><strong>PID</strong></td>
 380                                 <td bgcolor='$color{'color20'}' align='center'><strong>$Lang::tr{'memory'}</strong></td>
 381                         </tr>
 382
 383                         <tr>
 384                                 <td class='base'></td>
 385                                 <td bgcolor='$color{'color22'}' align='center'>$pid</td>
 386                                 <td bgcolor='$color{'color22'}' align='center'>$memory KB</td>
 387                         </tr>
 388                 </table>
 389 END
 390 } else {
 391         # Otherwise display a hint that the service is not launched.
 392         print <<END;
 393                 <table width='95%' cellspacing='0' class='tbl'>
 394                         <tr>
 395                                 <th bgcolor='$color{'color20'}' colspan='3' align='left'><strong>$Lang::tr{'intrusion detection'}</strong></th>
 396                         </tr>
 397
 398                         <tr>
 399                                 <td class='base'>$Lang::tr{'guardian daemon'}</td>
 400                                 <td align='center' width='75%' bgcolor='${Header::colourred}'><font color='white'><strong>$Lang::tr{'stopped'}</strong></font></td>
 401                         </tr>
 402                 </table>
 403 END
 404 }
 405 &Header::closebox();
 406
 407 # Draw elements for IDS configuration.
 408 &Header::openbox('100%', 'center', $Lang::tr{'settings'});
 409
 410 my $rulesdate;
 411
 412 # Check if a ruleset allready has been downloaded.
 413 if ( -f "$IDS::rulestarball"){
 414         # Call stat on the filename to obtain detailed information.
 415         my @Info = stat("$IDS::rulestarball");
 416
 417         # Grab details about the creation time.
 418         $rulesdate = localtime($Info[9]);
 419 }
 420
 421 print <<END
 422 <form method='post' action='$ENV{'SCRIPT_NAME'}'>
 423         <table width='100%' border='0'>
 424                 <tr>
 425                         <td class='base' width='25%'>
 426                                 <input type='checkbox' name='ENABLE_IDS' $checked{'ENABLE_IDS'}{'on'}>$Lang::tr{'ids activate'} $Lang::tr{'intrusion detection system'}
 427                         </td>
 428
 429                         <td class='base' width='25%'>
 430                                 &nbsp
 431                         </td>
 432                 </tr>
 433
 434                 <tr>
 435                         <td colspan='2'><br><br>
 436                 </tr>
 437
 438                 <tr>
 439                         <td class='base' width='25%'>
 440                                 <b>$Lang::tr{'ids analyze incomming traffic'}</b>
 441                         </td>
 442
 443                         <td class='base' width='25%'>
 444                                 <b>$Lang::tr{'ids analyze routing traffic'}</b>
 445                         </td>
 446                 </tr>
 447 END
 448 ;
 449
 450 # Loop through the array of available networks and print config options.
 451 foreach my $zone (@network_zones) {
 452         my $checked_input;
 453         my $checked_forward;
 454
 455         # Convert current zone name to upper case.
 456         my $zone_upper = uc($zone);
 457
 458         # Grab checkbox status from settings hash.
 459         if ($idssettings{"ENABLE_IDS_INPUT_$zone_upper"} eq "on") {
 460                 $checked_input = "checked = 'checked'";
 461         }
 462
 463         # Do the same for the forward setting.
 464         if ($idssettings{"ENABLE_IDS_FORWARD_$zone_upper"} eq "on") {
 465                 $checked_forward = "checked = 'checked'";
 466         }
 467
 468         print "<tr>\n";
 469         print "<td class='base' width='25%'>\n";
 470         print "<input type='checkbox' name='ENABLE_IDS_INPUT_$zone_upper' $checked_input>$Lang::tr{'ids active on'} $Lang::tr{$zone}\n";
 471         print "</td>\n";
 472
 473         print "<td class='base' width='25%'>\n";
 474         print "<input type='checkbox' name='ENABLE_IDS_FORWARD_$zone_upper' $checked_forward>$Lang::tr{'ids active on'} $Lang::tr{$zone}\n";
 475         print "</td>\n";
 476         print "</tr>\n";
 477 }
 478
 479 print <<END
 480                 </tr>
 481
 482                 <tr>
 483                         <td colspan='4'><br><br></td>
 484                 </tr>
 485
 486                 <tr>
 487                         <td colspan='4'><b>$Lang::tr{'ids rules update'}</b></td>
 488                 </tr>
 489
 490                 <tr>
 491                         <td colspan='4'><select name='RULES'>
 492                                 <option value='nothing' $selected{'RULES'}{'nothing'} >$Lang::tr{'no'}</option>
 493                                 <option value='emerging' $selected{'RULES'}{'emerging'} >$Lang::tr{'emerging rules'}</option>
 494                                 <option value='community' $selected{'RULES'}{'community'} >$Lang::tr{'community rules'}</option>
 495                                 <option value='registered' $selected{'RULES'}{'registered'} >$Lang::tr{'registered user rules'}</option>
 496                                 <option value='subscripted' $selected{'RULES'}{'subscripted'} >$Lang::tr{'subscripted user rules'}</option>
 497                         </select>
 498                         </td>
 499                 </tr>
 500
 501                 <tr>
 502                         <td colspan='4'>
 503                                 <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>
 504                                 <br>$Lang::tr{'ids rules license2'} <a href='https://www.snort.org/account/oinkcode' target='_blank'>Get an Oinkcode</a>, $Lang::tr{'ids rules license3'}</br>
 505                         </td>
 506                 </tr>
 507
 508                 <tr>
 509                         <td colspan='4' nowrap='nowrap'>Oinkcode:&nbsp;<input type='text' size='40' name='OINKCODE' value='$idssettings{'OINKCODE'}'></td>
 510                 </tr>
 511
 512                 <tr>
 513                         <td colspan='4' align='left'><br>
 514                                 <input type='submit' name='RULESET' value='$Lang::tr{'download new ruleset'}'>&nbsp;$Lang::tr{'updates installed'}: $rulesdate
 515                         </td>
 516
 517                 </tr>
 518         </table>
 519
 520         <br><br>
 521
 522         <table width='100%'>
 523                 <tr>
 524                         <td align='right'><input type='submit' name='IDS' value='$Lang::tr{'save'}' /></td>
 525                 </tr>
 526         </table>
 527 </form>
 528 END
 529 ;
 530
 531 &Header::closebox();
 532
 533 &Header::openbox('100%', 'LEFT', $Lang::tr{'intrusion detection system rules'});
 534         print"<form method='POST' action='$ENV{'SCRIPT_NAME'}'>\n";
 535
 536         # Output display table for rule files
 537         print "<table width='100%'>\n";
 538
 539         # Local variable required for java script to show/hide
 540         # rules of a rulefile.
 541         my $rulesetcount = 1;
 542
 543         # Loop over each rule file
 544         foreach my $rulefile (sort keys(%idsrules)) {
 545                 my $rulechecked = '';
 546
 547                 # Check if rule file is enabled
 548                 if ($idsrules{$rulefile}{'Rulefile'}{'State'} eq 'on') {
 549                         $rulechecked = 'CHECKED';
 550                 }
 551
 552                 # Table and rows for the rule files.
 553                 print"<tr>\n";
 554                 print"<td class='base' width='5%'>\n";
 555                 print"<input type='checkbox' name='$rulefile' $rulechecked>\n";
 556                 print"</td>\n";
 557                 print"<td class='base' width='90%'><b>$rulefile</b></td>\n";
 558                 print"<td class='base' width='5%' align='right'>\n";
 559                 print"<a href=\"javascript:showhide('ruleset$rulesetcount')\">SHOW</a>\n";
 560                 print"</td>\n";
 561                 print"</tr>\n";
 562
 563                 # Rows which will be hidden per default and will contain the single rules.
 564                 print"<tr  style='display:none' id='ruleset$rulesetcount'>\n";
 565                 print"<td colspan='3'>\n";
 566
 567                 # Local vars
 568                 my $lines;
 569                 my $rows;
 570                 my $col;
 571
 572                 # New table for the single rules.
 573                 print "<table width='100%'>\n";
 574
 575                 # Loop over rule file rules
 576                 foreach my $sid (sort {$a <=> $b} keys(%{$idsrules{$rulefile}})) {
 577                         # Local vars
 578                         my $ruledefchecked = '';
 579
 580                         # Skip rulefile itself.
 581                         next if ($sid eq "Rulefile");
 582
 583                         # If 2 rules have been displayed, start a new row
 584                         if (($lines % 2) == 0) {
 585                                 print "</tr><tr>\n";
 586
 587                                 # Increase rows by once.
 588                                 $rows++;
 589                         }
 590
 591                         # Colour lines.
 592                         if ($rows % 2) {
 593                                 $col="bgcolor='$color{'color20'}'";
 594                         } else {
 595                                 $col="bgcolor='$color{'color22'}'";
 596                         }
 597
 598                         # Set rule state
 599                         if ($idsrules{$rulefile}{$sid}{'State'} eq 'on') {
 600                                 $ruledefchecked = 'CHECKED';
 601                         }
 602
 603                         # Create rule checkbox and display rule description
 604                         print "<td class='base' width='5%' align='right' $col>\n";
 605                         print "<input type='checkbox' NAME='$sid' $ruledefchecked>\n";
 606                         print "</td>\n";
 607                         print "<td class='base' width='45%' $col>$idsrules{$rulefile}{$sid}{'Description'}</td>";
 608
 609                         # Increment rule count
 610                         $lines++;
 611                 }
 612
 613                 # If do not have a second rule for row, create empty cell
 614                 if (($lines % 2) != 0) {
 615                         print "<td class='base'></td>";
 616                 }
 617
 618                 # Close display table
 619                 print "</tr></table></td></tr>";
 620
 621                 # Finished whith the rule file, increase count.
 622                 $rulesetcount++;
 623         }
 624
 625         # Close display table
 626         print "</table>";
 627
 628 print <<END
 629 <table width='100%'>
 630 <tr>
 631         <td width='100%' align='right'><input type='submit' name='RULESET' value='$Lang::tr{'update'}'>
 632                 &nbsp; <!-- space for future online help link -->
 633         </td>
 634 </tr>
 635 </table>
 636 </form>
 637 END
 638 ;
 639 &Header::closebox();
 640 &Header::closebigbox();
 641 &Header::closepage();
 642
 643 #
 644 ## A function to display a notice, to lock the webpage and
 645 ## tell the user which action currently will be performed.
 646 #
 647 sub working_notice ($) {
 648         my ($message) = @_;
 649
 650         &Header::openpage($Lang::tr{'intrusion detection system'}, 1, '');
 651         &Header::openbigbox('100%', 'left', '', $errormessage);
 652         &Header::openbox( 'Waiting', 1,);
 653                 print <<END;
 654                         <table>
 655                                 <tr>
 656                                         <td><img src='/images/indicator.gif' alt='$Lang::tr{'aktiv'}' /></td>
 657                                         <td>$message</td>
 658                                 </tr>
 659                         </table>
 660 END
 661         &Header::closebox();
 662         &Header::closebigbox();
 663         &Header::closepage();
 664 }
 665
 666 #
 667 ## A tiny function to perform a reload of the webpage after one second.
 668 #
 669 sub reload () {
 670         print "<meta http-equiv='refresh' content='1'>\n";
 671
 672         # Stop the script.
 673         exit;
 674 }
 675
 676 #
 677 ## Private function to read-in and parse rules of a given rulefile.
 678 #
 679 ## The given file will be read, parsed and all valid rules will be stored by ID,
 680 ## message/description and it's state in the idsrules hash.
 681 #
 682 sub readrulesfile ($) {
 683         my $rulefile = shift;
 684
 685         # Open rule file and read in contents
 686         open(RULEFILE, "$IDS::rulespath/$rulefile") or die "Unable to read $rulefile!";
 687
 688         # Store file content in an array.
 689         my @lines = <RULEFILE>;
 690
 691         # Close file.
 692         close(RULEFILE);
 693
 694         # Loop over rule file contents
 695         foreach my $line (@lines) {
 696                 # Remove whitespaces.
 697                 chomp $line;
 698
 699                 # Skip blank  lines.
 700                 next if ($line =~ /^\s*$/);
 701
 702                 # Local vars.
 703                 my $sid;
 704                 my $msg;
 705
 706                 # Gather rule sid and message from the ruleline.
 707                 if ($line =~ m/.*msg:\"(.*?)\"\; .* sid:(.*?); /) {
 708                         $msg = $1;
 709                         $sid = $2;
 710
 711                         # Check if a rule has been found.
 712                         if ($sid && $msg) {
 713                                 # Add rule to the idsrules hash.
 714                                 $idsrules{$rulefile}{$sid}{'Description'} = $msg;
 715
 716                                 # Grab status of the rule. Check if ruleline starts with a "dash".
 717                                 if ($line =~ /^\#/) {
 718                                         # If yes, the rule is disabled.
 719                                         $idsrules{$rulefile}{$sid}{'State'} = "off";
 720                                 } else {
 721                                         # Otherwise the rule is enabled.
 722                                         $idsrules{$rulefile}{$sid}{'State'} = "on";
 723                                 }
 724                         }
 725                 }
 726         }
 727 }
 728
 729 #
 730 ## Function to get the used memory of a given process-id.
 731 #
 732 sub get_memory_usage($) {
 733         my $pid = @_;
 734
 735         my $memory=0;
 736
 737         # Try to open statm file for the given process-id on the pseudo
 738         # file system proc.
 739         if (open(FILE, "/proc/$pid/statm")) {
 740                 # Read file content.
 741                 my $temp = <FILE>;
 742
 743                 # Splitt file content and store in an array.
 744                 my @memory = split(/ /,$temp);
 745
 746                 # Close file handle.
 747                 close(FILE);
 748
 749                 # Calculate memory usage.
 750                 $memory+=$memory[0];
 751
 752                 # Return memory usage.
 753                 return $memory;
 754         }
 755
 756         # If the file could not be open, return nothing.
 757         return;
 758 }
 759
 760 #
 761 ## Function to generate the file which contains the home net information.
 762 #
 763 sub generate_home_net_file() {
 764         my %netsettings;
 765
 766         # Read-in network settings.
 767         &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
 768
 769         # Get available network zones.
 770         my @network_zones = &IDS::get_available_network_zones();
 771
 772         # Temporary array to store network address and prefix of the configured
 773         # networks.
 774         my @networks;
 775
 776         # Loop through the array of available network zones.
 777         foreach my $zone (@network_zones) {
 778                 # Skip the red network - It never can be part to the home_net!
 779                 next if($zone eq "red");
 780
 781                 # Convert current zone name into upper case.
 782                 $zone = uc($zone);
 783
 784                 # Generate key to access the required data from the netsettings hash.
 785                 my $zone_netaddress = $zone . "_NETADDRESS";
 786                 my $zone_netmask = $zone . "_NETMASK";
 787
 788                 # Obtain the settings from the netsettings hash.
 789                 my $netaddress = $netsettings{$zone_netaddress};
 790                 my $netmask = $netsettings{$zone_netmask};
 791
 792                 # Convert the subnetmask into prefix notation.
 793                 my $prefix = &Network::convert_netmask2prefix($netmask);
 794
 795                 # Generate full network string.
 796                 my $network = join("/", $netaddress,$prefix);
 797
 798                 # Check if the network is valid.
 799                 if(&Network::check_subnet($network)) {
 800                         # Add the generated network to the array of networks.
 801                         push(@networks, $network);
 802                 }
 803         }
 804
 805         # Format home net declaration.
 806         my $line = "\"\[";
 807
 808         # Loop through the array of networks.
 809         foreach my $network (@networks) {
 810                 # Add the network to the line.
 811                 $line = "$line" . "$network";
 812
 813                 # Check if the current network was the last in the array.
 814                 if ($network eq $networks[-1]) {
 815                         # Close the line.
 816                         $line = "$line" . "\]\"";
 817                 } else {
 818                         # Add "," for the next network.
 819                         $line = "$line" . "\,";
 820                 }
 821         }
 822
 823         # Open file to store the addresses of the home net.
 824         open(FILE, ">$idshomenetfile") or die "Could not open $idshomenetfile. $!\n";
 825
 826         # Print yaml header.
 827         print FILE "%YAML 1.1\n";
 828         print FILE "---\n\n";
 829
 830         # Print notice about autogenerated file.
 831         print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
 832
 833         # Print the generated and required HOME_NET declaration to the file.
 834         print FILE "HOME_NET:\t$line\n";
 835
 836         # Close file handle.
 837         close(FILE);
 838
 839 }