# Location where all config and settings files are stored.
our $settingsdir = "${General::swroot}/suricata";
+# File where the used rulefiles are stored.
+our $used_rulefiles_file = "$settingsdir/suricata-used-rulefiles.yaml";
+
+# File where the addresses of the homenet are stored.
+our $homenet_file = "$settingsdir/suricata-homenet.yaml";
+
+# File which contains the enabled sids.
+our $enabled_sids_file = "$settingsdir/oinkmaster-enabled-sids.conf";
+
+# File which contains the disabled sids.
+our $disabled_sids_file = "$settingsdir/oinkmaster-disabled-sids.conf";
+
+# File which contains wheater the rules should be changed.
+our $modify_sids_file = "$settingsdir/oinkmaster-modify-sids.conf";
+
+# File which stores the configured IPS settings.
+our $ids_settings_file = "$settingsdir/settings";
+
+# File which stores the configured rules-settings.
+our $rules_settings_file = "$settingsdir/rules-settings";
+
+# File which stores the configured settings for whitelisted addresses.
+our $ignored_file = "$settingsdir/ignored";
+
# Location and name of the tarball which contains the ruleset.
our $rulestarball = "/var/tmp/idsrules.tar.gz";
# Location where the rulefiles are stored.
our $rulespath = "/var/lib/suricata";
+# File which contains the rules to whitelist addresses on suricata.
+our $whitelist_file = "$rulespath/whitelist.rules";
+
# File which contains a list of all supported ruleset sources.
# (Sourcefire, Emergingthreads, etc..)
our $rulesetsourcesfile = "$settingsdir/ruleset-sources";
# Array with supported cron intervals.
my @cron_intervals = ('off', 'daily', 'weekly' );
+#
+## Function to check and create all IDS related files, if the does not exist.
+#
+sub check_and_create_filelayout() {
+ # Check if the files exist and if not, create them.
+ unless (-f "$enabled_sids_file") { &create_empty_file($enabled_sids_file); }
+ unless (-f "$disabled_sids_file") { &create_empty_file($disabled_sids_file); }
+ unless (-f "$modify_sids_file") { &create_empty_file($modify_sids_file); }
+ unless (-f "$used_rulefiles_file") { &create_empty_file($used_rulefiles_file); }
+ unless (-f "$ids_settings_file") { &create_empty_file($ids_settings_file); }
+ unless (-f "$rules_settings_file") { &create_empty_file($rules_settings_file); }
+ unless (-f "$ignored_file") { &create_empty_file($ignored_file); }
+ unless (-f "$whitelist_file" ) { &create_empty_file($whitelist_file); }
+}
+
#
## Function for checking if at least 300MB of free disk space are available
## on the "/var" partition.
return 1;
}
+ # Pass the requrested url to the downloader.
+ my $request = HTTP::Request->new(HEAD => $url);
+
+ # Accept the html header.
+ $request->header('Accept' => 'text/html');
+
+ # Perform the request and fetch the html header.
+ my $response = $downloader->request($request);
+
+ # Check if there was any error.
+ unless ($response->is_success) {
+ # Obtain error.
+ my $error = $response->content;
+
+ # Log error message.
+ &_log_to_syslog("Unable to download the ruleset. \($error\)");
+
+ # Return "1" - false.
+ return 1;
+ }
+
+ # Assign the fetched header object.
+ my $header = $response->headers;
+
+ # Grab the remote file size from the object and store it in the
+ # variable.
+ my $remote_filesize = $header->content_length;
+
+ # Load perl module to deal with temporary files.
+ use File::Temp;
+
+ # Generate temporay file name, located in "/var/tmp" and with a suffix of ".tar.gz".
+ my $tmp = File::Temp->new( SUFFIX => ".tar.gz", DIR => "/var/tmp/", UNLINK => 0 );
+ my $tmpfile = $tmp->filename();
+
# Pass the requested url to the downloader.
my $request = HTTP::Request->new(GET => $url);
- # Perform the request and save the output into the "$rulestarball" file.
- my $response = $downloader->request($request, $rulestarball);
+ # Perform the request and save the output into the tmpfile.
+ my $response = $downloader->request($request, $tmpfile);
# Check if there was any error.
unless ($response->is_success) {
return 1;
}
+ # Load perl stat module.
+ use File::stat;
+
+ # Perform stat on the tmpfile.
+ my $stat = stat($tmpfile);
+
+ # Grab the local filesize of the downloaded tarball.
+ my $local_filesize = $stat->size;
+
+ # Check if both file sizes match.
+ unless ($remote_filesize eq $local_filesize) {
+ # Log error message.
+ &_log_to_syslog("Unable to completely download the ruleset. ");
+ &_log_to_syslog("Only got $local_filesize Bytes instead of $remote_filesize Bytes. ");
+
+ # Delete temporary file.
+ unlink("$tmpfile");
+
+ # Return "1" - false.
+ return 1;
+ }
+
+ # Load file copy module, which contains the move() function.
+ use File::Copy;
+
+ # Overwrite existing rules tarball with the new downloaded one.
+ move("$tmpfile", "$rulestarball");
+
# If we got here, everything worked fine. Return nothing.
return;
}
## the IDS rules, before extracting and modifing the new ruleset.
#
sub _cleanup_rulesdir() {
- # Loop through the rules-directory.
- while ($item = glob($rulespath/*)) {
- # Skip element if it is a directory.
- next if -d $item;
+ # Open rules directory and do a directory listing.
+ opendir(DIR, $rulespath) or die $!;
- # Delete the current processed item, if not, exit this function
+ # Loop through the direcory.
+ while (my $file = readdir(DIR)) {
+ # We only want files.
+ next unless (-f "$rulespath/$file");
+
+ # Skip element if it has config as file extension.
+ next if ($file =~ m/\.config$/);
+
+ # Delete the current processed file, if not, exit this function
# and return an error message.
- unlink($item) or return "Could not delete $item. $!\n";
+ unlink("$rulespath/$file") or return "Could not delete $rulespath/$file. $!\n";
}
- # Return noting;
+ # Return nothing;
return;
}
+#
+## Function to generate the file which contains the home net information.
+#
+sub generate_home_net_file() {
+ my %netsettings;
+
+ # Read-in network settings.
+ &General::readhash("${General::swroot}/ethernet/settings", \%netsettings);
+
+ # Get available network zones.
+ my @network_zones = &get_available_network_zones();
+
+ # Temporary array to store network address and prefix of the configured
+ # networks.
+ my @networks;
+
+ # Loop through the array of available network zones.
+ foreach my $zone (@network_zones) {
+ # Skip the red network - It never can be part to the home_net!
+ next if($zone eq "red");
+
+ # Convert current zone name into upper case.
+ $zone = uc($zone);
+
+ # Generate key to access the required data from the netsettings hash.
+ my $zone_netaddress = $zone . "_NETADDRESS";
+ my $zone_netmask = $zone . "_NETMASK";
+
+ # Obtain the settings from the netsettings hash.
+ my $netaddress = $netsettings{$zone_netaddress};
+ my $netmask = $netsettings{$zone_netmask};
+
+ # Convert the subnetmask into prefix notation.
+ my $prefix = &Network::convert_netmask2prefix($netmask);
+
+ # Generate full network string.
+ my $network = join("/", $netaddress,$prefix);
+
+ # Check if the network is valid.
+ if(&Network::check_subnet($network)) {
+ # Add the generated network to the array of networks.
+ push(@networks, $network);
+ }
+ }
+
+ # Format home net declaration.
+ my $line = "\"\[";
+
+ # Loop through the array of networks.
+ foreach my $network (@networks) {
+ # Add the network to the line.
+ $line = "$line" . "$network";
+
+ # Check if the current network was the last in the array.
+ if ($network eq $networks[-1]) {
+ # Close the line.
+ $line = "$line" . "\]\"";
+ } else {
+ # Add "," for the next network.
+ $line = "$line" . "\,";
+ }
+ }
+
+ # Open file to store the addresses of the home net.
+ open(FILE, ">$homenet_file") or die "Could not open $homenet_file. $!\n";
+
+ # Print yaml header.
+ print FILE "%YAML 1.1\n";
+ print FILE "---\n\n";
+
+ # Print notice about autogenerated file.
+ print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
+
+ # Print the generated and required HOME_NET declaration to the file.
+ print FILE "HOME_NET:\t$line\n";
+
+ # Close file handle.
+ close(FILE);
+}
+
+#
+## Function to generate and write the file for used rulefiles.
+#
+sub write_used_rulefiles_file(@) {
+ my @files = @_;
+
+ # Open file for used rulefiles.
+ open (FILE, ">$used_rulefiles_file") or die "Could not write to $used_rulefiles_file. $!\n";
+
+ # Write yaml header to the file.
+ print FILE "%YAML 1.1\n";
+ print FILE "---\n\n";
+
+ # Write header to file.
+ print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
+
+ # Allways use the whitelist.
+ print FILE " - whitelist.rules\n";
+
+ # Loop through the array of given files.
+ foreach my $file (@files) {
+ # Check if the given filename exists and write it to the file of used rulefiles.
+ if(-f "$rulespath/$file") {
+ print FILE " - $file\n";
+ }
+ }
+
+ # Close file after writing.
+ close(FILE);
+}
+
+#
+## Function to generate and write the file for modify the ruleset.
+#
+sub write_modify_sids_file($) {
+ my ($ruleaction) = @_;
+
+ # Open modify sid's file for writing.
+ open(FILE, ">$IDS::modify_sids_file") or die "Could not write to $IDS::modify_sids_file. $!\n";
+
+ # Write file header.
+ print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
+
+ # Check if the traffic only should be monitored.
+ unless($ruleaction eq "alert") {
+ # Tell oinkmaster to switch all rules from alert to drop.
+ print FILE "modifysid \* \"alert\" \| \"drop\"\n";
+ }
+
+ # Close file handle.
+ close(FILE);
+}
+
1;
projects / ipfire-2.x.git / blobdiff