require "${General::swroot}/network-functions.pl";
require "${General::swroot}/suricata/ruleset-sources";
+# Load perl module to deal with Archives.
+use Archive::Tar;
+
+# Load perl module to deal with files and path.
+use File::Basename;
+
+# Load module to move files.
+use File::Copy;
+
+# Load module to recursely remove files and a folder.
+use File::Path qw(rmtree);
+
+# Load module to get file stats.
+use File::stat;
+
+# Load module to deal with temporary files.
+use File::Temp;
+
+# Load module to deal with the date formats used by the HTTP protocol.
+use HTTP::Date;
+
+# Load the libwwwperl User Agent module.
+use LWP::UserAgent;
+
+# Load function from posix module to format time strings.
+use POSIX qw (strftime);
+
+# Load module to talk to the kernel log daemon.
+use Sys::Syslog qw(:DEFAULT setlogsock);
+
# 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 main file for providers ruleset inclusion exists.
+our $suricata_used_rulesfiles_file = "$settingsdir/suricata-used-rulesfiles.yaml";
# File where the addresses of the homenet are stored.
our $homenet_file = "$settingsdir/suricata-homenet.yaml";
# File where the HTTP ports definition is stored.
our $http_ports_file = "$settingsdir/suricata-http-ports.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";
-# DEPRECATED - File which stores the configured rules-settings.
-our $rules_settings_file = "$settingsdir/rules-settings";
-
# File which stores the used and configured ruleset providers.
our $providers_settings_file = "$settingsdir/providers-settings";
# File which stores the configured settings for whitelisted addresses.
our $ignored_file = "$settingsdir/ignored";
-# DEPRECATED - Location and name of the tarball which contains the ruleset.
-our $rulestarball = "/var/tmp/idsrules.tar.gz";
+# File which stores HTTP Etags for providers which supports them
+# for cache management.
+our $etags_file = "$settingsdir/etags";
# Location where the downloaded rulesets are stored.
-our $dl_rules_path = "/var/tmp";
+our $dl_rules_path = "/var/cache/suricata";
# File to store any errors, which also will be read and displayed by the wui.
our $storederrorfile = "/tmp/ids_storederror";
# Location where the rulefiles are stored.
our $rulespath = "/var/lib/suricata";
+# Location where the default rulefils are stored.
+our $default_rulespath = "/usr/share/suricata/rules";
+
+# Location where the addition config files are stored.
+our $configspath = "/usr/share/suricata";
+
# Location of the classification file.
-our $classification_file = "$rulespath/classification.config";
+our $classification_file = "$configspath/classification.config";
# Location of the sid to msg mappings file.
our $sid_msg_file = "$rulespath/sid-msg.map";
# Prefix for each downloaded ruleset.
my $dl_rulesfile_prefix = "idsrules";
+# Temporary directory to download the rules files.
+my $tmp_dl_directory = "/var/tmp";
+
# Temporary directory where the rulesets will be extracted.
my $tmp_directory = "/tmp/ids_tmp";
-# Array with allowed commands of suricatactrl.
-my @suricatactrl_cmds = ( 'start', 'stop', 'restart', 'reload', 'fix-rules-dir', 'cron' );
+# Temporary directory where the extracted rules files will be stored.
+my $tmp_rules_directory = "$tmp_directory/rules";
-# Array with supported cron intervals.
-my @cron_intervals = ('off', 'daily', 'weekly' );
+# Temporary directory where the extracted additional config files will be stored.
+my $tmp_conf_directory = "$tmp_directory/conf";
+
+# Array with allowed commands of suricatactrl.
+my @suricatactrl_cmds = ( 'start', 'stop', 'restart', 'reload', 'fix-rules-dir' );
# Array which contains the HTTP ports, which statically will be declared as HTTP_PORTS in the
# http_ports_file.
my @http_ports = ('80', '81');
+# Array which contains a list of rulefiles which always will be included if they exist.
+my @static_included_rulefiles = ('local.rules', 'whitelist.rules');
+
+# Array which contains a list of allways enabled application layer protocols.
+my @static_enabled_app_layer_protos = ('app-layer', 'decoder', 'files', 'stream');
+
# Hash which allows to convert the download type (dl_type) to a file suffix.
my %dl_type_to_suffix = (
"archive" => ".tar.gz",
"plain" => ".rules",
);
+# Hash to translate an application layer protocol to the application name.
+my %tr_app_layer_proto = (
+ "ikev2" => "ipsec",
+ "krb5" => "kerberos",
+);
+
#
## 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 "$suricata_used_rulesfiles_file") { &create_empty_file($suricata_used_rulesfiles_file); }
unless (-f "$ids_settings_file") { &create_empty_file($ids_settings_file); }
unless (-f "$providers_settings_file") { &create_empty_file($providers_settings_file); }
- unless (-f "$ignored_file") { &create_empty_file($ignored_file); }
unless (-f "$whitelist_file" ) { &create_empty_file($whitelist_file); }
}
return sort(@providers);
}
+#
+## Function to get a list of all enabled ruleset providers.
+##
+## They will be returned as an array.
+#
+sub get_enabled_providers () {
+ my %used_providers = ();
+
+ # Array to store the enabled providers.
+ my @enabled_providers = ();
+
+ # Read-in the providers config file.
+ &General::readhasharray("$providers_settings_file", \%used_providers);
+
+ # Loop through the hash of used_providers.
+ foreach my $id (keys %used_providers) {
+ # Skip disabled providers.
+ next unless ($used_providers{$id}[3] eq "enabled");
+
+ # Grab the provider handle.
+ my $provider = "$used_providers{$id}[0]";
+
+ # Add the provider to the array of enabled providers.
+ push(@enabled_providers, $provider);
+ }
+
+ # Return the array.
+ return @enabled_providers;
+}
+
+#
+## Function to get a hash of provider handles and their configured modes (IDS/IPS).
+#
+sub get_providers_mode () {
+ my %used_providers = ();
+
+ # Hash to store the providers and their configured modes.
+ my %providers_mode = ();
+
+ # Read-in the providers config file.
+ &General::readhasharray("$providers_settings_file", \%used_providers);
+
+ # Loop through the hash of used_providers.
+ foreach my $id (keys %used_providers) {
+ # Skip disabled providers.
+ next unless ($used_providers{$id}[3] eq "enabled");
+
+ # Grab the provider handle.
+ my $provider = "$used_providers{$id}[0]";
+
+ # Grab the provider mode.
+ my $mode = "$used_providers{$id}[4]";
+
+ # Fall back to IDS if no mode could be obtained.
+ unless($mode) {
+ $mode = "IDS";
+ }
+
+ # Add details to provider_modes hash.
+ $providers_mode{$provider} = $mode;
+ }
+
+ # Return the hash.
+ return %providers_mode;
+}
+
#
## Function for checking if at least 300MB of free disk space are available
## on the "/var" partition.
# Check if the available disk space is more than 300MB.
if ($available < 300) {
- # Log error to syslog.
- &_log_to_syslog("Not enough free disk space on /var. Only $available MB from 300 MB available.");
-
- # Exit function and return "1" - False.
- return 1;
+ # Exit function and return the available disk space.
+ return $available;
}
}
}
}
#
-## This function is responsible for downloading the configured IDS rulesets or if no one is specified
-## all configured rulesets will be downloaded.
+## This function is responsible for downloading the ruleset for a given provider.
##
-## * At first it gathers all configured ruleset providers, initialize the downloader and sets an
-## upstream proxy if configured.
-## * After that, the given ruleset or in case all rulesets should be downloaded, it will determine wether it
-## is enabled or not.
+## * At first it initialize the downloader and sets an upstream proxy if configured.
## * The next step will be to generate the final download url, by obtaining the URL for the desired
-## ruleset, add the settings for the upstream proxy.
-## * Finally the function will grab all the rules files or tarballs from the servers.
+## ruleset and add the settings for the upstream proxy.
+## * Finally the function will grab the rule file or tarball from the server.
+## It tries to reduce the amount of download by using the "If-Modified-Since" HTTP header.
+#
+## Return codes:
+##
+## * "no url" - If no download URL could be gathered for the provider.
+## * "not modified" - In case the already stored rules file is up to date.
+## * "incomplete download" - When the remote file size differs from the downloaded file size.
+## * "$error" - The error message generated from the LWP::User Agent module.
#
sub downloadruleset ($) {
my ($provider) = @_;
- # If no provider is given default to "all".
- $provider //= 'all';
-
- # Hash to store the providers and access id's, for which rules should be downloaded.
- my %sheduled_providers = ();
-
- # Get used provider settings.
- my %used_providers = ();
- &General::readhasharray("$providers_settings_file", \%used_providers);
-
- # Check if a ruleset has been configured.
- unless(%used_providers) {
- # Log that no ruleset has been configured and abort.
- &_log_to_syslog("No ruleset provider has been configured.");
-
- # Return "1".
- return 1;
- }
+ # The amount of download attempts before giving up and
+ # logging an error.
+ my $max_dl_attempts = 3;
# Read proxysettings.
my %proxysettings=();
&General::readhash("${General::swroot}/proxy/settings", \%proxysettings);
- # Load required perl module to handle the download.
- use LWP::UserAgent;
-
# Init the download module.
- my $downloader = LWP::UserAgent->new;
+ #
+ # Request SSL hostname verification and specify path
+ # to the CA file.
+ my $downloader = LWP::UserAgent->new(
+ ssl_opts => {
+ SSL_ca_file => '/etc/ssl/cert.pem',
+ verify_hostname => 1,
+ }
+ );
# Set timeout to 10 seconds.
$downloader->timeout(10);
$downloader->proxy(['http', 'https'], $proxy_url);
}
- # Loop through the hash of configured providers.
- foreach my $id ( keys %used_providers ) {
- # Skip providers which are not enabled.
- next if ($used_providers{$id}[3] ne "enabled");
-
- # Obtain the provider handle.
- my $provider_handle = $used_providers{$id}[0];
-
- # Handle update off all providers.
- if (($provider eq "all") || ($provider_handle eq "$provider")) {
- # Add provider handle and it's id to the hash of sheduled providers.
- $sheduled_providers{$provider_handle} = $id;
- }
- }
-
- # Loop through the hash of sheduled providers.
- foreach my $provider ( keys %sheduled_providers) {
- # Grab the download url for the provider.
- my $url = $IDS::Ruleset::Providers{$provider}{'dl_url'};
+ # Grab the download url for the provider.
+ my $url = $IDS::Ruleset::Providers{$provider}{'dl_url'};
- # Check if the provider requires a subscription.
- if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
- # Grab the previously stored access id for the provider from hash.
- my $id = $sheduled_providers{$provider};
+ # Check if the provider requires a subscription.
+ if ($IDS::Ruleset::Providers{$provider}{'requires_subscription'} eq "True") {
+ # Grab the subscription code.
+ my $subscription_code = &get_subscription_code($provider);
- # Grab the subscription code.
- my $subscription_code = $used_providers{$id}[1];
+ # Add the subscription code to the download url.
+ $url =~ s/\<subscription_code\>/$subscription_code/g;
- # Add the subscription code to the download url.
- $url =~ s/\<subscription_code\>/$subscription_code/g;
+ }
- }
+ # Abort and return "no url", if no url could be determined for the provider.
+ return "no url" unless ($url);
- # Abort if no url could be determined for the provider.
- unless ($url) {
- # Log error and abort.
- &_log_to_syslog("Unable to gather a download URL for the selected ruleset provider.");
- return 1;
- }
+ # Pass the requested URL to the downloader.
+ my $request = HTTP::Request->new(GET => $url);
- # Variable to store the filesize of the remote object.
- my $remote_filesize;
+ # Generate temporary file name, located in the tempoary download directory and with a suffix of ".tmp".
+ # The downloaded file will be stored there until some sanity checks are performed.
+ my $tmp = File::Temp->new( SUFFIX => ".tmp", DIR => "$tmp_dl_directory/", UNLINK => 0 );
+ my $tmpfile = $tmp->filename();
- # The sourcfire (snort rules) does not allow to send "HEAD" requests, so skip this check
- # for this webserver.
- #
- # Check if the ruleset source contains "snort.org".
- unless ($url =~ /\.snort\.org/) {
- # Pass the requrested url to the downloader.
- my $request = HTTP::Request->new(HEAD => $url);
+ # Call function to get the final path and filename for the downloaded file.
+ my $dl_rulesfile = &_get_dl_rulesfile($provider);
- # Accept the html header.
- $request->header('Accept' => 'text/html');
+ # Check if the rulesfile already exits, because it has been downloaded in the past.
+ #
+ # In this case we are requesting the server if the remote file has been changed or not.
+ # This will be done by sending the modification time in a special HTTP header.
+ if (-f $dl_rulesfile) {
+ # Call stat on the file.
+ my $stat = stat($dl_rulesfile);
- # Perform the request and fetch the html header.
- my $response = $downloader->request($request);
+ # Omit the mtime of the existing file.
+ my $mtime = $stat->mtime;
- # Check if there was any error.
- unless ($response->is_success) {
- # Obtain error.
- my $error = $response->status_line();
+ # Convert the timestamp into right format.
+ my $http_date = time2str($mtime);
- # Log error message.
- &_log_to_syslog("Unable to download the ruleset. \($error\)");
+ # Add the If-Modified-Since header to the request to ask the server if the
+ # file has been modified.
+ $request->header( 'If-Modified-Since' => "$http_date" );
+ }
- # Return "1" - false.
- return 1;
- }
+ # Read-in Etags file for known Etags if the file is present.
+ my %etags = ();
+ &General::readhash("$etags_file", \%etags) if (-f $etags_file);
- # Assign the fetched header object.
- my $header = $response->headers();
+ # Check if an Etag for the current provider is stored.
+ if ($etags{$provider}) {
+ # Grab the stored tag.
+ my $etag = $etags{$provider};
- # Grab the remote file size from the object and store it in the
- # variable.
- $remote_filesize = $header->content_length;
- }
+ # Add an "If-None-Match header to the request to ask the server if the
+ # file has been modified.
+ $request->header( 'If-None-Match' => $etag );
+ }
- # Load perl module to deal with temporary files.
- use File::Temp;
+ my $dl_attempt = 1;
+ my $response;
- # Generate temporary file name, located in "/var/tmp" and with a suffix of ".tmp".
- my $tmp = File::Temp->new( SUFFIX => ".tmp", DIR => "/var/tmp/", UNLINK => 0 );
- my $tmpfile = $tmp->filename();
+ # Download and retry on failure.
+ while ($dl_attempt <= $max_dl_attempts) {
+ # Perform the request and save the output into the tmpfile.
+ $response = $downloader->request($request, $tmpfile);
- # Pass the requested url to the downloader.
- my $request = HTTP::Request->new(GET => $url);
+ # Check if the download was successfull.
+ if($response->is_success) {
+ # Break loop.
+ last;
- # Perform the request and save the output into the tmpfile.
- my $response = $downloader->request($request, $tmpfile);
+ # Check if the server responds with 304 (Not Modified).
+ } elsif ($response->code == 304) {
+ # Return "not modified".
+ return "not modified";
- # Check if there was any error.
- unless ($response->is_success) {
+ # Check if we ran out of download re-tries.
+ } elsif ($dl_attempt eq $max_dl_attempts) {
# Obtain error.
my $error = $response->content;
- # Log error message.
- &_log_to_syslog("Unable to download the ruleset. \($error\)");
-
- # Return "1" - false.
- return 1;
+ # Return the error message from response..
+ return "$error";
}
- # 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 = $stat->size;
+ # Remove temporary file, if one exists.
+ unlink("$tmpfile") if (-e "$tmpfile");
- # Check if both file sizes match.
- if (($remote_filesize) && ($remote_filesize ne $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");
+ # Increase download attempt counter.
+ $dl_attempt++;
+ }
- # Return "1" - false.
- return 1;
- }
+ # Obtain the connection headers.
+ my $headers = $response->headers;
- # Genarate and assign file name and path to store the downloaded rules file.
- my $dl_rulesfile = &_get_dl_rulesfile($provider);
+ # Get the timestamp from header, when the file has been modified the
+ # last time.
+ my $last_modified = $headers->last_modified;
- # Check if a file name could be obtained.
- unless ($dl_rulesfile) {
- # Log error message.
- &_log_to_syslog("Unable to store the downloaded rules file. ");
+ # Get the remote size of the downloaded file.
+ my $remote_filesize = $headers->content_length;
- # Delete downloaded temporary file.
- unlink("$tmpfile");
+ # Grab the Etag from response it the server provides one.
+ if ($response->header('Etag')) {
+ # Add the Etag to the etags hash.
+ $etags{$provider} = $response->header('Etag');
- # Return "1" - false.
- }
+ # Write the etags file.
+ &General::writehash($etags_file, \%etags);
+ }
- # Load file copy module, which contains the move() function.
- use File::Copy;
+ # Perform stat on the tmpfile.
+ my $stat = stat($tmpfile);
- # Overwrite the may existing rulefile or tarball with the downloaded one.
- move("$tmpfile", "$dl_rulesfile");
+ # Grab the local filesize of the downloaded tarball.
+ my $local_filesize = $stat->size;
+ # Check if both file sizes match.
+ if (($remote_filesize) && ($remote_filesize ne $local_filesize)) {
# Delete temporary file.
unlink("$tmpfile");
- # Set correct ownership for the tarball.
- set_ownership("$dl_rulesfile");
+ # Return "1" - false.
+ return "incomplete download";
}
+ # Overwrite the may existing rulefile or tarball with the downloaded one.
+ move("$tmpfile", "$dl_rulesfile");
+
+ # Check if we got a last-modified value from the server.
+ if ($last_modified) {
+ # Assign the last-modified timestamp as mtime to the
+ # rules file.
+ utime(time(), "$last_modified", "$dl_rulesfile");
+ }
+
+ # Delete temporary file.
+ unlink("$tmpfile");
+
+ # Set correct ownership for the tarball.
+ set_ownership("$dl_rulesfile");
+
# If we got here, everything worked fine. Return nothing.
return;
}
#
## Function to extract a given ruleset.
+##
+## In case the ruleset provider offers a plain file, it simply will
+## be copied.
#
sub extractruleset ($) {
my ($provider) = @_;
- # Load perl module to deal with archives.
- use Archive::Tar;
-
- # Load perl module to deal with files and path.
- use File::Basename;
+ # Disable chown functionality when uncompressing files.
+ $Archive::Tar::CHOWN = "0";
# Get full path and downloaded rulesfile for the given provider.
my $tarball = &_get_dl_rulesfile($provider);
# Check if the file exists.
unless (-f $tarball) {
- &_log_to_syslog("Could not extract ruleset file: $tarball");
+ &_log_to_syslog("Could not find ruleset file: $tarball");
# Return nothing.
return;
}
- # Destination directories, where the files will be extracted.
- my $rules_destdir = "$tmp_directory/rules";
- my $conf_destdir = "$tmp_directory/conf";
-
# Check if the temporary directories exist, otherwise create them.
mkdir("$tmp_directory") unless (-d "$tmp_directory");
- mkdir("$rules_destdir") unless (-d "$rules_destdir");
- mkdir("$conf_destdir") unless (-d "$conf_destdir");
-
- # Initialize the tar module.
- my $tar = Archive::Tar->new($tarball);
-
- # Get the filelist inside the tarball.
- my @packed_files = $tar->list_files;
-
- # Loop through the filelist.
- foreach my $packed_file (@packed_files) {
- my $destination;
-
- # Splitt the packed file into chunks.
- my $file = fileparse($packed_file);
-
- # Handle msg-id.map file.
- if ("$file" eq "sid-msg.map") {
- # Set extract destination to temporary config_dir.
- $destination = "$conf_destdir/$provider\-sid-msg.map";
- # Handle classification.conf
- } elsif ("$file" eq "classification.config") {
- # Set extract destination to temporary config_dir.
- $destination = "$conf_destdir/$provider\-classification.config";
- # Handle rules files.
- } elsif ($file =~ m/\.rules$/) {
- my $rulesfilename;
-
- # Splitt the filename into chunks.
- my @filename = split("-", $file);
-
- # Reverse the array.
- @filename = reverse(@filename);
-
- # Get the amount of elements in the array.
- my $elements = @filename;
-
- # Remove last element of the hash.
- # It contains the vendor name, which will be replaced.
- if ($elements >= 3) {
+ mkdir("$tmp_rules_directory") unless (-d "$tmp_rules_directory");
+ mkdir("$tmp_conf_directory") unless (-d "$tmp_conf_directory");
+
+ # Omit the type (dl_type) of the stored ruleset.
+ my $type = $IDS::Ruleset::Providers{$provider}{'dl_type'};
+
+ # Handle the different ruleset types.
+ if ($type eq "plain") {
+ # Generate destination filename an full path.
+ my $destination = "$tmp_rules_directory/$provider\-ruleset.rules";
+
+ # Copy the file into the temporary rules directory.
+ copy($tarball, $destination);
+
+ } elsif ( $type eq "archive") {
+ # Initialize the tar module.
+ my $tar = Archive::Tar->new($tarball);
+
+ # Get the filelist inside the tarball.
+ my @packed_files = $tar->list_files;
+
+ # Loop through the filelist.
+ foreach my $packed_file (@packed_files) {
+ my $destination;
+
+ # Splitt the packed file into chunks.
+ my $file = fileparse($packed_file);
+
+ # Handle msg-id.map file.
+ if ("$file" eq "sid-msg.map") {
+ # Set extract destination to temporary config_dir.
+ $destination = "$tmp_conf_directory/$provider\-sid-msg.map";
+
+ # Handle classification.conf
+ } elsif ("$file" eq "classification.config") {
+ # Set extract destination to temporary config_dir.
+ $destination = "$tmp_conf_directory/$provider\-classification.config";
+
+ # Handle rules files.
+ } elsif ($file =~ m/\.rules$/) {
+ # Skip rule files which are not located in the rules directory or archive root.
+ next unless(($packed_file =~ /^rules\//) || ($packed_file !~ /\//));
+
+ # Skip deleted.rules.
+ #
+ # Mostly they have been taken out for correctness or performance reasons and therfore
+ # it is not a great idea to enable any of them.
+ next if($file =~ m/deleted.rules$/);
+
+ my $rulesfilename;
+
+ # Splitt the filename into chunks.
+ my @filename = split("-", $file);
+
+ # Reverse the array.
+ @filename = reverse(@filename);
+
+ # Get the amount of elements in the array.
+ my $elements = @filename;
+
+ # Remove last element of the hash.
+ # It contains the vendor name, which will be replaced.
+ if ($elements >= 3) {
# Remove last element from hash.
- pop(@filename);
- }
+ pop(@filename);
+ }
- # Check if the last element of the filename does not
- # contain the providers name.
- if ($filename[-1] ne "$provider") {
- # Add provider name as last element.
- push(@filename, $provider);
+ # Check if the last element of the filename does not
+ # contain the providers name.
+ if ($filename[-1] ne "$provider") {
+ # Add provider name as last element.
+ push(@filename, $provider);
+ }
+
+ # Reverse the array back.
+ @filename = reverse(@filename);
+
+ # Generate the name for the rulesfile.
+ $rulesfilename = join("-", @filename);
+
+ # Set extract destination to temporaray rules_dir.
+ $destination = "$tmp_rules_directory/$rulesfilename";
+ } else {
+ # Skip all other files.
+ next;
}
- # Reverse the array back.
- @filename = reverse(@filename);
+ # Check if the destination file exists.
+ unless(-e "$destination") {
+ # Extract the file to the temporary directory.
+ $tar->extract_file("$packed_file", "$destination");
+ } else {
+ # Generate temporary file name, located in the temporary rules directory and a suffix of ".tmp".
+ my $tmp = File::Temp->new( SUFFIX => ".tmp", DIR => "$tmp_rules_directory", UNLINK => 0 );
+ my $tmpfile = $tmp->filename();
+
+ # Extract the file to the new temporary file name.
+ $tar->extract_file("$packed_file", "$tmpfile");
+
+ # Open the the existing file.
+ open(DESTFILE, ">>", "$destination") or die "Could not open $destination. $!\n";
+ open(TMPFILE, "<", "$tmpfile") or die "Could not open $tmpfile. $!\n";
+
+ # Loop through the content of the temporary file.
+ while (<TMPFILE>) {
+ # Append the content line by line to the destination file.
+ print DESTFILE "$_";
+ }
- # Generate the name for the rulesfile.
- $rulesfilename = join("-", @filename);
+ # Close the file handles.
+ close(TMPFILE);
+ close(DESTFILE);
- # Set extract destination to temporaray rules_dir.
- $destination = "$rules_destdir/$rulesfilename";
- } else {
- # Skip all other files.
- next;
+ # Remove the temporary file.
+ unlink("$tmpfile");
+ }
}
-
- # Extract the file to the temporary directory.
- $tar->extract_file("$packed_file", "$destination");
}
}
#
-## A tiny wrapper function to call the oinkmaster script.
+## A wrapper function to call the oinkmaster script, setup the rules structues and
+## call the functions to merge the additional config files. (classification, sid-msg, etc.).
#
sub oinkmaster () {
# Check if the files in rulesdir have the correct permissions.
&_check_rulesdir_permissions();
- # Cleanup the rules directory before filling it with the new rulest.
+ # Cleanup the rules directory before filling it with the new rulests.
&_cleanup_rulesdir();
- # Load perl module to talk to the kernel syslog.
- use Sys::Syslog qw(:DEFAULT setlogsock);
+ # Get all enabled providers.
+ my @enabled_providers = &get_enabled_providers();
- # Establish the connection to the syslog service.
- openlog('oinkmaster', 'cons,pid', 'user');
+ # Loop through the array of enabled providers.
+ foreach my $provider (@enabled_providers) {
+ # Call the extractruleset function.
+ &extractruleset($provider);
+ }
+
+ # Call function to process the ruleset and do all modifications.
+ &process_ruleset(@enabled_providers);
+
+ # Call function to merge the classification files.
+ &merge_classifications(@enabled_providers);
+
+ # Call function to merge the sid to message mapping files.
+ &merge_sid_msg(@enabled_providers);
+
+ # Cleanup temporary directory.
+ &cleanup_tmp_directory();
+}
+
+#
+## Function to alter the ruleset.
+#
+sub process_ruleset(@) {
+ my (@providers) = @_;
+
+ # Hash to store the configured provider modes.
+ my %providers_mode = &get_providers_mode();
- # Call oinkmaster to generate ruleset.
- open(OINKMASTER, "/usr/local/bin/oinkmaster.pl -s -u file://$rulestarball -C $settingsdir/oinkmaster.conf -o $rulespath 2>&1 |") or die "Could not execute oinkmaster $!\n";
+ # Array to store the extracted rulefile from the temporary rules directory.
+ my @extracted_rulefiles;
- # Log output of oinkmaster to syslog.
- while(<OINKMASTER>) {
- # The syslog function works best with an array based input,
- # so generate one before passing the message details to syslog.
- my @syslog = ("INFO", "$_");
+ # Get names of the extracted raw rulefiles.
+ opendir(DIR, $tmp_rules_directory) or die "Could not read from $tmp_rules_directory. $!\n";
+ while (my $file = readdir(DIR)) {
+ # Ignore single and double dotted files.
+ next if $file =~ /^\.\.?$/;
- # Send the log message.
- syslog(@syslog);
+ # Add file to the array of extracted files.
+ push(@extracted_rulefiles, $file);
}
- # Close the pipe to oinkmaster process.
- close(OINKMASTER);
+ # Close directory handle.
+ closedir(DIR);
- # Close the log handle.
- closelog();
+ # Loop through the array of providers.
+ foreach my $provider (@providers) {
+ # Hash to store the obtained SIDs and REV of each provider.
+ my %rules = ();
+
+ # Hash which holds modifications to apply to the rules.
+ my %modifications = ();
+
+ # Loop through the array of extraced rulefiles.
+ foreach my $file (@extracted_rulefiles) {
+ # Skip file if it does not belong to the current processed provider.
+ next unless ($file =~ m/^$provider/);
+
+ # Open the rulefile.
+ open(FILE, "$tmp_rules_directory/$file") or die "Could not read $tmp_rules_directory/$file. $!\n";
+
+ # Loop through the file content.
+ while (my $line = <FILE>) {
+ # Skip blank lines.
+ next if ($line =~ /^\s*$/);
+
+ # Call function to get the sid and rev of the rule.
+ my ($sid, $rev) = &_get_sid_and_rev($line);
+
+ # Skip rule if a sid with a higher rev already has added to the rules hash.
+ next if ($rev le $rules{$sid});
+
+ # Add the new or rule with higher rev to the hash of rules.
+ $rules{$sid} = $rev;
+ }
+
+ # Close file handle.
+ close(FILE);
+ }
+
+ # Get filename which contains the ruleset modifications for this provider.
+ my $modification_file = &get_provider_ruleset_modifications_file($provider);
+
+ # Read file which holds the modifications of the ruleset for the current provider.
+ &General::readhash($modification_file, \%modifications) if (-f $modification_file);
+
+ # Loop again through the array of extracted rulesfiles.
+ foreach my $file (@extracted_rulefiles) {
+ # Skip the file if it does not belong to the current provider.
+ next unless ($file =~ m/^$provider/);
+
+ # Open the rulefile for writing.
+ open(RULEFILE, ">", "$rulespath/$file") or die "Could not write to file $rulespath/$file. $!\n";
+
+ # Open the rulefile for reading.
+ open(TMP_RULEFILE, "$tmp_rules_directory/$file") or die "Could not read $tmp_rules_directory/$file. $!\n";
+
+ # Loop through the raw temporary rulefile.
+ while (my $line = <TMP_RULEFILE>) {
+ # Get the sid and rev of the rule.
+ my ($sid, $rev) = &_get_sid_and_rev($line);
+
+ # Check if the current rule is obsoleted by a newer one.
+ #
+ # In this case the rev number in the rules hash is higher than the current one.
+ next if ($rev lt $rules{$sid});
+
+ # Check if the rule should be enabled or disabled.
+ if ($modifications{$sid} eq "enabled") {
+ # Drop the # at the start of the line.
+ $line =~ s/^\#//;
+ } elsif ($modifications{$sid} eq "disabled") {
+ # Add a # at the start of the line to disable the rule.
+ $line = "#$line" unless ($line =~ /^#/);
+ }
+
+ # Check if the Provider is set so IPS mode.
+ if ($providers_mode{$provider} eq "IPS") {
+ # Replacements for sourcefire rules.
+ $line =~ s/^#\s*(?:alert|drop)(.+policy balanced-ips alert)/alert${1}/;
+ $line =~ s/^#\s*(?:alert|drop)(.+policy balanced-ips drop)/drop${1}/;
+
+ # Replacements for generic rules.
+ $line =~ s/^(#?)\s*(?:alert|drop)/${1}drop/;
+ $line =~ s/^(#?)\s*drop(.+flowbits:noalert;)/${1}alert${2}/;
+ }
+
+ # Write line / rule to the target rule file.
+ print RULEFILE "$line";
+ }
+
+ # Close filehandles.
+ close(RULEFILE);
+ close(TMP_RULEFILE);
+ }
+ }
}
#
# Loop through the given array of providers.
foreach my $provider (@providers) {
# Generate full path to classification file.
- my $classification_file = "$tmp_directory/conf/$provider\-classification.config";
+ my $classification_file = "$tmp_conf_directory/$provider\-classification.config";
# Skip provider if no classification file exists.
next unless (-f "$classification_file");
# Loop through the array of given providers.
foreach my $provider (@providers) {
# Generate full path and filename.
- my $sid_msg_file = "$tmp_directory/conf/$provider\-sid-msg.map";
+ my $sid_msg_file = "$tmp_conf_directory/$provider\-sid-msg.map";
# Skip provider if no sid to msg mapping file for this provider exists.
next unless (-f $sid_msg_file);
close(FILE);
}
+#
+## A very tiny function to move an extracted ruleset from the temporary directory into
+## the rules directory.
+#
+sub move_tmp_ruleset() {
+ # Do a directory listing of the temporary directory.
+ opendir DH, $tmp_rules_directory;
+
+ # Loop over all files.
+ while(my $file = readdir DH) {
+ # Move them to the rules directory.
+ move "$tmp_rules_directory/$file" , "$rulespath/$file";
+ }
+
+ # Close directory handle.
+ closedir DH;
+}
+
+#
+## Function to cleanup the temporary IDS directroy.
+#
+sub cleanup_tmp_directory () {
+
+ # Delete temporary directory and all containing files.
+ rmtree([ "$tmp_directory" ]);
+}
+
#
## Function to do all the logging stuff if the downloading or updating of the ruleset fails.
#
sub _log_to_syslog ($) {
my ($message) = @_;
- # Load perl module to talk to the kernel syslog.
- use Sys::Syslog qw(:DEFAULT setlogsock);
-
# The syslog function works best with an array based input,
# so generate one before passing the message details to syslog.
my @syslog = ("ERR", "<ERROR> $message");
return $rulesfile;
}
+#
+## Private function to obtain the sid and rev of a rule.
+#
+## Returns an array with the sid as first and the rev as second value.
+#
+sub _get_sid_and_rev ($) {
+ my ($line) = @_;
+
+ my @ret;
+
+ # Use regex to obtain the sid and rev.
+ if ($line =~ m/.*sid:\s*(.*?);.*rev:\s*(.*?);/) {
+ # Add the sid and rev to the array.
+ push(@ret, $1);
+ push(@ret, $2);
+ }
+
+ # Return the array.
+ return @ret;
+}
+
+#
+## Tiny function to delete the stored ruleset file or tarball for a given provider.
+#
+sub drop_dl_rulesfile ($) {
+ my ($provider) = @_;
+
+ # Gather the full path and name of the stored rulesfile.
+ my $rulesfile = &_get_dl_rulesfile($provider);
+
+ # Check if the given rulesfile exists.
+ if (-f $rulesfile) {
+ # Delete the stored rulesfile.
+ unlink($rulesfile) or die "Could not delete $rulesfile. $!\n";
+ }
+}
+
#
## Function to check if the IDS is running.
#
# Skip current command unless the given one has been found.
next unless($cmd eq $option);
- # Check if the given command is "cron".
- if ($option eq "cron") {
- # Check if an interval has been given.
- if ($interval) {
- # Check if the given interval is valid.
- foreach my $element (@cron_intervals) {
- # Skip current element until the given one has been found.
- next unless($element eq $interval);
-
- # Call the suricatactrl binary and pass the "cron" command
- # with the requrested interval.
- &General::system("$suricatactrl", "$option", "$interval");
-
- # Return "1" - True.
- return 1;
- }
- }
+ # Call the suricatactrl binary and pass the requrested
+ # option to it.
+ &General::system("$suricatactrl", "$option");
- # If we got here, the given interval is not supported or none has been given. - Return nothing.
- return;
- } else {
- # Call the suricatactrl binary and pass the requrested
- # option to it.
- &General::system("$suricatactrl", "$option");
-
- # Return "1" - True.
- return 1;
- }
+ # Return "1" - True.
+ return 1;
}
# Command not found - return nothing.
# We only want files.
next unless (-f "$rulespath/$file");
- # Skip element if it has config as file extension.
- next if ($file =~ m/\.config$/);
-
# Skip rules file for whitelisted hosts.
next if ("$rulespath/$file" eq $whitelist_file);
}
#
-## Function to generate and write the file for used rulefiles.
+## Function to write the file that contains the rulefiles which are loaded by suricaa.
+##
+## This function requires an array of used provider handles.
#
-sub write_used_rulefiles_file(@) {
- my @files = @_;
+sub write_used_rulefiles_file (@) {
+ my (@providers) = @_;
+
+ # Get the enabled application layer protocols.
+ my @enabled_app_layer_protos = &get_suricata_enabled_app_layer_protos();
- # Open file for used rulefiles.
- open (FILE, ">$used_rulefiles_file") or die "Could not write to $used_rulefiles_file. $!\n";
+ # Open the file.
+ open (FILE, ">", $suricata_used_rulesfiles_file) or die "Could not write to $suricata_used_rulesfiles_file. $!\n";
- # Write yaml header to the file.
print FILE "%YAML 1.1\n";
print FILE "---\n\n";
- # Write header to file.
+ # Write notice about autogenerated 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 static included rulesfiles.
+ foreach my $file (@static_included_rulefiles) {
+ # Check if the file exists.
+ if (-f "$rulespath/$file") {
+ # Write the rulesfile name to the file.
+ print FILE " - $rulespath/$file\n";
+ }
+ }
+
+ print FILE "\n#Default rules for used application layer protocols.\n";
+ foreach my $enabled_app_layer_proto (@enabled_app_layer_protos) {
+ # Check if the current processed app layer proto needs to be translated
+ # into an application name.
+ if (exists($tr_app_layer_proto{$enabled_app_layer_proto})) {
+ # Obtain the translated application name for this protocol.
+ $enabled_app_layer_proto = $tr_app_layer_proto{$enabled_app_layer_proto};
+ }
+
+ # Generate filename.
+ my $rulesfile = "$default_rulespath/$enabled_app_layer_proto\.rules";
+
+ # Check if such a file exists.
+ if (-f "$rulesfile") {
+ # Write the rulesfile name to the file.
+ print FILE " - $rulesfile\n";
+ }
+
+ # Generate filename with "events" in filename.
+ $rulesfile = "$default_rulespath/$enabled_app_layer_proto\-events.rules";
+
+ # Check if this file exists.
+ if (-f "$rulesfile" ) {
+ # Write the rulesfile name to the file.
+ print FILE " - $rulesfile\n";
+ }
+ }
+
+ # Loop through the array of enabled providers.
+ foreach my $provider (@providers) {
+ # Get the used rulefile for this provider.
+ my @used_rulesfiles = &get_provider_used_rulesfiles($provider);
+
+ # Check if there are
+ if(@used_rulesfiles) {
+ # Add notice to the file.
+ print FILE "\n#Used Rulesfiles for provider $provider.\n";
+
+ # Loop through the array of used rulefiles.
+ foreach my $enabled_rulesfile (@used_rulesfiles) {
+ # Generate name and full path to the rulesfile.
+ my $rulesfile = "$rulespath/$enabled_rulesfile";
- # 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";
+ # Write the ruelsfile name to the file.
+ print FILE " - $rulesfile\n";
+ }
}
}
- # Close file after writing.
+ # Close the file handle
close(FILE);
}
#
-## Function to generate and write the file for modify the ruleset.
+## Tiny function to generate the full path and name for the file which stores the used rulefiles of a given provider.
#
-sub write_modify_sids_file() {
- # Get configured settings.
- my %idssettings=();
- my %rulessettings=();
- &General::readhash("$ids_settings_file", \%idssettings);
- &General::readhash("$rules_settings_file", \%rulessettings);
+sub get_provider_used_rulesfiles_file ($) {
+ my ($provider) = @_;
- # Gather the configured ruleset.
- my $ruleset = $rulessettings{'RULES'};
+ my $filename = "$settingsdir/$provider\-used\-rulesfiles";
- # Open modify sid's file for writing.
- open(FILE, ">$modify_sids_file") or die "Could not write to $modify_sids_file. $!\n";
+ # Return the gernerated file.
+ return $filename;
+}
- # Write file header.
- print FILE "#Autogenerated file. Any custom changes will be overwritten!\n";
+#
+## Tiny function to generate the full path and name for the file which stores the modifications of a ruleset.
+#
+sub get_provider_ruleset_modifications_file($) {
+ my ($provider) = @_;
- # Check if the traffic only should be monitored.
- unless($idssettings{'MONITOR_TRAFFIC_ONLY'} eq 'on') {
- # Suricata is in IPS mode, which means that the rule actions have to be changed
- # from 'alert' to 'drop', however not all rules should be changed. Some rules
- # exist purely to set a flowbit which is used to convey other information, such
- # as a specific type of file being downloaded, to other rulewhich then check for
- # malware in that file. Rules which fall into the first category should stay as
- # alert since not all flows of that type contain malware.
-
- if($ruleset eq 'registered' or $ruleset eq 'subscripted' or $ruleset eq 'community') {
- # These types of rulesfiles contain meta-data which gives the action that should
- # be used when in IPS mode. Do the following:
- #
- # 1. Disable all rules and set the action to 'drop'
- # 2. Set the action back to 'alert' if the rule contains 'flowbits:noalert;'
- # This should give rules not in the policy a reasonable default if the user
- # manually enables them.
- # 3. Enable rules and set actions according to the meta-data strings.
-
- my $policy = 'balanced'; # Placeholder to allow policy to be changed.
-
- print FILE <<END;
-modifysid * "^#?(?:alert|drop)" | "#drop"
-modifysid * "^#drop(.+flowbits:noalert;)" | "#alert\${1}"
-modifysid * "^#(?:alert|drop)(.+policy $policy-ips alert)" | "alert\${1}"
-modifysid * "^#(?:alert|drop)(.+policy $policy-ips drop)" | "drop\${1}"
-END
- } else {
- # These rulefiles don't have the metadata, so set rules to 'drop' unless they
- # contain the string 'flowbits:noalert;'.
- print FILE <<END;
-modifysid * "^(#?)(?:alert|drop)" | "\${1}drop"
-modifysid * "^(#?)drop(.+flowbits:noalert;)" | "\${1}alert\${2}"
-END
+ my $filename = "$settingsdir/$provider\-modifications";
+
+ # Return the filename.
+ return $filename;
+}
+
+#
+## Function to get the subscription code of a configured provider.
+#
+sub get_subscription_code($) {
+ my ($provider) = @_;
+
+ my %configured_providers = ();
+
+ # Read-in providers settings file.
+ &General::readhasharray($providers_settings_file, \%configured_providers);
+
+ # Loop through the hash of configured providers.
+ foreach my $id (keys %configured_providers) {
+ # Assign nice human-readable values to the data fields.
+ my $provider_handle = $configured_providers{$id}[0];
+ my $subscription_code = $configured_providers{$id}[1];
+
+ # Check if the current processed provider is the requested one.
+ if ($provider_handle eq $provider) {
+ # Return the obtained subscription code.
+ return $subscription_code;
}
}
- # Close file handle.
- close(FILE);
+ # No subscription code found - return nothing.
+ return;
+}
+
+#
+## Function to get the ruleset date for a given provider.
+##
+## The function simply return the creation date in a human read-able format
+## of the stored providers rulesfile.
+#
+sub get_ruleset_date($) {
+ my ($provider) = @_;
+ my $date;
+ my $mtime;
+
+ # Get the stored rulesfile for this provider.
+ my $stored_rulesfile = &_get_dl_rulesfile($provider);
+
+ # Check if we got a file.
+ if (-f $stored_rulesfile) {
+ # Call stat on the rulestarball.
+ my $stat = stat("$stored_rulesfile");
+
+ # Get timestamp the file creation.
+ $mtime = $stat->mtime;
+ }
+
+ # Check if the timestamp has not been grabbed.
+ unless ($mtime) {
+ # Return N/A for Not available.
+ return "N/A";
+ }
+
+ # Convert into human read-able format.
+ $date = strftime('%Y-%m-%d %H:%M:%S', localtime($mtime));
+
+ # Return the date.
+ return $date;
}
#
}
}
+#
+## Function to get the enabled application layer protocols.
+#
+sub get_suricata_enabled_app_layer_protos() {
+ # Array to store and return the enabled app layer protos.
+ my @enabled_app_layer_protos = ();
+
+ # Execute piped suricata command and return the list of
+ # enabled application layer protocols.
+ open(SURICATA, "suricata --list-app-layer-protos |") or die "Could not execute program: $!";
+
+ # Grab and store the list of enabled application layer protocols.
+ my @output = <SURICATA>;
+
+ # Close pipe.
+ close(SURICATA);
+
+ # Merge allways enabled static application layers protocols array.
+ @enabled_app_layer_protos = @static_enabled_app_layer_protos;
+
+ # Loop through the array which contains the output of suricata.
+ foreach my $line (@output) {
+ # Skip header line which starts with "===".
+ next if ($line =~ /^\s*=/);
+
+ # Skip info or warning lines.
+ next if ($line =~ /\s*--/);
+
+ # Remove newlines.
+ chomp($line);
+
+ # Add enabled app layer proto to the array.
+ push(@enabled_app_layer_protos, $line);
+ }
+
+ # Sort the array.
+ @enabled_app_layer_protos = sort(@enabled_app_layer_protos);
+
+ # Return the array.
+ return @enabled_app_layer_protos;
+}
+
#
## Function to generate the rules file with whitelisted addresses.
#
# Check if the address/network is valid.
if ((&General::validip($address)) || (&General::validipandmask($address))) {
# Write rule line to the file to pass any traffic from this IP
- print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; sid:$sid\;)\n";
+ print FILE "pass ip $address any -> any any (msg:\"pass all traffic from/to $address\"\; bypass; sid:$sid\;)\n";
# Increment sid.
$sid++;
return;
}
+#
+## Function to get the used rules files of a given provider.
+#
+sub get_provider_used_rulesfiles($) {
+ my ($provider) = @_;
+
+ # Hash to store the used rulefiles of the provider.
+ my %provider_rulefiles = ();
+
+ # Array to store the used rulefiles.
+ my @used_rulesfiles = ();
+
+ # Get the filename which contains the used rulefiles for this provider.
+ my $used_rulesfiles_file = &get_provider_used_rulesfiles_file($provider);
+
+ # Read-in file, if it exists.
+ &General::readhash("$used_rulesfiles_file", \%provider_rulefiles) if (-f $used_rulesfiles_file);
+
+ # Loop through the hash of rulefiles which does the provider offer.
+ foreach my $rulefile (keys %provider_rulefiles) {
+ # Skip disabled rulefiles.
+ next unless($provider_rulefiles{$rulefile} eq "enabled");
+
+ # The General::readhash function does not allow dots as
+ # key value and limits the key "string" to the part before
+ # the dot, in case it contains one.
+ #
+ # So add the file extension for the rules file manually again.
+ $rulefile = "$rulefile.rules";
+
+ # Add the enabled rulefile to the array of enabled rulefiles.
+ push(@used_rulesfiles, $rulefile);
+ }
+
+ # Return the array of used rulesfiles.
+ return @used_rulesfiles;
+}
+
#
## Function to write the lock file for locking the WUI, while
## the autoupdate script runs.
projects / people / pmueller / ipfire-2.x.git / blobdiff