. * Copyright (C) 2003-2004 Manuel Kasper . * Copyright (C) 2006 Scott Ullrich * Copyright (C) 2009 Robert Zelaya Sr. Developer * Copyright (C) 2012 Ermal Luci * All rights reserved. * * Adapted for Suricata by: * Copyright (C) 2014 Bill Meeks * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ require_once("pfsense-utils.inc"); require_once("config.inc"); require_once("functions.inc"); require_once("services.inc"); require_once("service-utils.inc"); require_once("pkg-utils.inc"); require_once("filter.inc"); global $g, $config; if (!is_array($config['installedpackages']['suricata'])) $config['installedpackages']['suricata'] = array(); /* Get installed package version for display */ $suricata_package_version = "Suricata {$config['installedpackages']['package'][get_pkg_id("suricata")]['version']}"; // Define the installed package version define('SURICATA_PKG_VER', $suricata_package_version); // Define the name of the pf table used for IP blocks define('SURICATA_PF_TABLE', 'snort2c'); // Create some other useful defines $pf_version=substr(trim(file_get_contents("/etc/version")),0,3); if ($pf_version >= 2.2) define('SURICATADIR', '/usr/pbi/suricata-' . php_uname("m") . '/local/etc/suricata/'); else define('SURICATADIR', '/usr/pbi/suricata-' . php_uname("m") . '/etc/suricata/'); define('SURICATALOGDIR', '/var/log/suricata/'); define('RULES_UPD_LOGFILE', SURICATALOGDIR . 'suricata_rules_update.log'); define('ENFORCING_RULES_FILENAME', 'suricata.rules'); define('FLOWBITS_FILENAME', 'flowbit-required.rules'); // Rule set download filenames and prefixes define('ET_DNLD_FILENAME', 'emerging.rules.tar.gz'); define('ETPRO_DNLD_FILENAME', 'etpro.rules.tar.gz'); define('VRT_DNLD_FILENAME', 'snortrules-snapshot-edge.tar.gz'); define('GPLV2_DNLD_FILENAME', 'community-rules.tar.gz'); define('VRT_FILE_PREFIX', 'snort_'); define('GPL_FILE_PREFIX', 'GPLv2_'); define('ET_OPEN_FILE_PREFIX', 'emerging-'); define('ET_PRO_FILE_PREFIX', 'etpro-'); function suricata_generate_id() { global $config; $suricatacfg = $config['installedpackages']['suricata']['rule']; while (true) { $suricata_uuid = mt_rand(1, 65535); foreach ($suricatacfg as $value) { if ($value['uuid'] == $suricata_uuid) continue 2; } break; } return $suricata_uuid; } function suricata_is_running($suricata_uuid, $if_real, $type = 'suricata') { global $g; return isvalidpid("{$g['varrun_path']}/{$type}_{$if_real}{$suricata_uuid}.pid"); } function suricata_barnyard_stop($suricatacfg, $if_real) { global $g; $suricata_uuid = $suricatacfg['uuid']; if (isvalidpid("{$g['varrun_path']}/barnyard2_{$if_real}{$suricata_uuid}.pid")) { log_error("[Suricata] Barnyard2 STOP for {$suricatacfg['descr']}({$if_real})..."); killbypid("{$g['varrun_path']}/barnyard2_{$if_real}{$suricata_uuid}.pid"); } } function suricata_stop($suricatacfg, $if_real) { global $g; $suricata_uuid = $suricatacfg['uuid']; if (isvalidpid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid")) { log_error("[Suricata] Suricata STOP for {$suricatacfg['descr']}({$if_real})..."); killbypid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid"); sleep(1); // For some reason Suricata seems to need a double TERM signal to actually shutdown if (isvalidpid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid")) killbypid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid"); } // Stop Barnyard2 on the interface if running suricata_barnyard_stop($suricatacfg, $if_real); } function suricata_barnyard_start($suricatacfg, $if_real) { global $g; $suricata_uuid = $suricatacfg['uuid']; $suricatadir = SURICATADIR . "suricata_{$suricata_uuid}_{$if_real}"; $suricatalogdir = SURICATALOGDIR . "suricata_{$if_real}{$suricata_uuid}"; if ($suricatacfg['barnyard_enable'] == 'on') { log_error("[Suricata] Barnyard2 START for {$suricatacfg['descr']}({$if_real})..."); mwexec_bg("/usr/local/bin/barnyard2 -r {$suricata_uuid} -f unified2.alert --pid-path {$g['varrun_path']} --nolock-pidfile -c {$suricatadir}/barnyard2.conf -d {$suricatalogdir} -D -q"); } } function suricata_start($suricatacfg, $if_real) { global $g; $suricatadir = SURICATADIR; $suricata_uuid = $suricatacfg['uuid']; if ($suricatacfg['enable'] == 'on') { log_error("[Suricata] Suricata START for {$suricatacfg['descr']}({$if_real})..."); mwexec_bg("/usr/local/bin/suricata -i {$if_real} -D -c {$suricatadir}suricata_{$suricata_uuid}_{$if_real}/suricata.yaml --pidfile {$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid"); } else return; // Start Barnyard2 if enabled on the interface suricata_barnyard_start($suricatacfg, $if_real); } function suricata_reload_config($suricatacfg, $signal="USR2") { /**************************************************************/ /* This function sends the passed SIGNAL to the Suricata */ /* instance on the passed interface to cause Suricata to */ /* reload and parse the running configuration without */ /* impacting packet processing. It also executes the reload */ /* as a background process and returns control immediately */ /* to the caller. */ /* */ /* $signal = USR2 (default) parses and reloads config. */ /**************************************************************/ global $g; $suricatadir = SURICATADIR; $suricata_uuid = $suricatacfg['uuid']; $if_real = get_real_interface($suricatacfg['interface']); /******************************************************/ /* Only send the SIGUSR2 if Suricata is running and */ /* we can find a valid PID for the process. */ /******************************************************/ if (isvalidpid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid")) { log_error("[Suricata] Suricata LIVE RULE RELOAD initiated for {$suricatacfg['descr']} ({$if_real})..."); // sigkillbypid("{$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid", $signal); mwexec_bg("/bin/pkill -{$signal} -F {$g['varrun_path']}/suricata_{$if_real}{$suricata_uuid}.pid"); } } function suricata_barnyard_reload_config($suricatacfg, $signal="HUP") { /**************************************************************/ /* This function sends the passed SIGNAL to the Barnyard2 */ /* instance on the passed interface to cause Barnyard to */ /* reload and parse the running configuration without */ /* impacting packet processing. It also executes the reload */ /* as a background process and returns control immediately */ /* to the caller. */ /* */ /* $signal = HUP (default) parses and reloads config. */ /**************************************************************/ global $g; $suricatadir = SURICATADIR; $suricata_uuid = $suricatacfg['uuid']; $if_real = get_real_interface($suricatacfg['interface']); /******************************************************/ /* Only send the SIGHUP if Barnyard2 is running and */ /* we can find a valid PID for the process. */ /******************************************************/ if (isvalidpid("{$g['varrun_path']}/barnyard2_{$if_real}{$suricata_uuid}.pid")) { log_error("[Suricata] Barnyard2 CONFIG RELOAD initiated for {$suricatacfg['descr']} ({$if_real})..."); // sigkillbypid("{$g['varrun_path']}/barnyard2_{$if_real}{$suricata_uuid}.pid", $signal); mwexec_bg("/bin/pkill -{$signal} -F {$g['varrun_path']}/barnyard2_{$if_real}{$suricata_uuid}.pid"); } } function suricata_get_blocked_ips() { $suri_pf_table = SURICATA_PF_TABLE; $blocked_ips = ""; exec("/sbin/pfctl -t {$suri_pf_table} -T show", $blocked_ips); $blocked_ips_array = array(); if (!empty($blocked_ips)) { if (is_array($blocked_ips)) { foreach ($blocked_ips as $blocked_ip) { if (empty($blocked_ip)) continue; $blocked_ips_array[] = trim($blocked_ip, " \n\t"); } } } return $blocked_ips_array; } /* func builds custom Pass Lists */ function suricata_find_list($find_name, $type = 'passlist') { global $config; $suricataglob = $config['installedpackages']['suricata']; if (!is_array($suricataglob[$type])) return ""; if (!is_array($suricataglob[$type]['item'])) return ""; foreach ($suricataglob[$type]['item'] as $value) { if ($value['name'] == $find_name) return $value; } return array(); } function suricata_build_list($suricatacfg, $listname = "", $passlist = false) { /***********************************************************/ /* The default is to build a HOME_NET variable unless */ /* '$passlist' is set to 'true' when calling. */ /***********************************************************/ global $config, $g, $aliastable, $filterdns; $home_net = array(); if ($listname == 'default' || empty($listname)) { $localnet = 'yes'; $wanip = 'yes'; $wangw = 'yes'; $wandns = 'yes'; $vips = 'yes'; $vpns = 'yes'; } else { $list = suricata_find_list($listname); if (empty($list)) return $list; $localnet = $list['localnets']; $wanip = $list['wanips']; $wangw = $list['wangateips']; $wandns = $list['wandnsips']; $vips = $list['vips']; $vpns = $list['vpnips']; if (!empty($list['address']) && is_alias($list['address'])) $home_net = explode(" ", trim(filter_expand_alias($list['address']))); } // Always add loopback to HOME_NET and passlist (ftphelper) if (!in_array("127.0.0.1", $home_net)) $home_net[] = "127.0.0.1"; /********************************************************************/ /* Always put the interface running Suricata in HOME_NET and */ /* whitelist unless it's the WAN. WAN options are handled further */ /* down. If the user specifically chose not to include LOCAL_NETS */ /* in the PASS LIST, then do not include the Suricata interface */ /* subnet in the PASS LIST. We do include the actual LAN interface */ /* IP for Suricata, though, to prevent locking out the firewall. */ /********************************************************************/ $suricataip = get_interface_ip($suricatacfg['interface']); if (!$whitelist || $localnet == 'yes' || empty($localnet)) { if (is_ipaddr($suricataip)) { if ($suricatacfg['interface'] <> "wan") { $sn = get_interface_subnet($suricatacfg['interface']); $ip = gen_subnet($suricataip, $sn) . "/{$sn}"; if (!in_array($ip, $home_net)) $home_net[] = $ip; } } } else { if (is_ipaddr($suricataip)) { if (!in_array($suricataip, $home_net)) $home_net[] = $suricataip; } } $suricataip = get_interface_ipv6($suricatacfg['interface']); if (!$whitelist || $localnet == 'yes' || empty($localnet)) { if (is_ipaddrv6($suricataip)) { if ($suricatacfg['interface'] <> "wan") { $sn = get_interface_subnetv6($suricatacfg['interface']); $ip = gen_subnetv6($suricataip, $sn). "/{$sn}"; if (!in_array($ip, $home_net)) $home_net[] = $ip; } } } else { if (is_ipaddrv6($suricataip)) { if (!in_array($suricataip, $home_net)) $home_net[] = $suricataip; } } if (!$whitelist || $localnet == 'yes' || empty($localnet)) { /*************************************************************************/ /* Iterate through the interface list and write out pass list items and */ /* also compile a HOME_NET list of all local interfaces for suricata. */ /* Skip the WAN interface as we do not typically want that whole subnet */ /* whitelisted (just the i/f IP itself which was handled earlier). */ /*************************************************************************/ $int_array = get_configured_interface_list(); foreach ($int_array as $int) { if ($int == "wan") continue; $subnet = get_interface_ip($int); if (is_ipaddr($subnet)) { $sn = get_interface_subnet($int); $ip = gen_subnet($subnet, $sn) . "/{$sn}"; if (!in_array($ip, $home_net)) $home_net[] = $ip; } if ($int == "wan") continue; $subnet = get_interface_ipv6($int); if (is_ipaddrv6($subnet)) { $sn = get_interface_subnetv6($int); $ip = gen_subnetv6($subnet, $sn). "/{$sn}"; if (!in_array($ip, $home_net)) $home_net[] = $ip; } } } if ($wanip == 'yes') { $ip = get_interface_ip("wan"); if (is_ipaddr($ip)) { if (!in_array($ip, $home_net)) $home_net[] = $ip; } $ip = get_interface_ipv6("wan"); if (is_ipaddrv6($ip)) { if (!in_array($ip, $home_net)) $home_net[] = $ip; } } if ($wangw == 'yes') { // Grab the default gateway if set $default_gw = exec("/sbin/route -n get default |grep 'gateway:' | /usr/bin/awk '{ print $2 }'"); if (is_ipaddr($default_gw) && !in_array($default_gw, $home_net)) $home_net[] = $default_gw; if (is_ipaddrv6($default_gw) && !in_array($default_gw, $home_net)) $home_net[] = $default_gw; // Get any other interface gateway and put in $HOME_NET if not there already $gw = get_interface_gateway($suricatacfg['interface']); if (is_ipaddr($gw) && !in_array($gw, $home_net)) $home_net[] = $gw; $gw = get_interface_gateway_v6($suricatacfg['interface']); if (is_ipaddrv6($gw) && !in_array($gw, $home_net)) $home_net[] = $gw; } if ($wandns == 'yes') { // Add DNS server for WAN interface to whitelist $dns_servers = get_dns_servers(); foreach ($dns_servers as $dns) { if ($dns && !in_array($dns, $home_net)) $home_net[] = $dns; } } if($vips == 'yes') { // iterate all vips and add to passlist if (is_array($config['virtualip']) && is_array($config['virtualip']['vip'])) { foreach($config['virtualip']['vip'] as $vip) { if ($vip['subnet'] && $vip['mode'] != 'proxyarp') { if (!in_array("{$vip['subnet']}/{$vip['subnet_bits']}", $home_net)) $home_net[] = "{$vip['subnet']}/{$vip['subnet_bits']}"; } } } } // grab a list of vpns and whitelist if user desires if ($vpns == 'yes') { $vpns_list = filter_get_vpns_list(); if (!empty($vpns_list)) { // Convert the returned space-delimited string to an array // and then add each VPN address to our HOME_NET array. $vpns = explode(" ", $vpns_list); foreach ($vpns as $vpn) $home_net[] = trim($vpn); unset($vpns, $vpns_list); } } $valresult = array(); foreach ($home_net as $vald) { if (empty($vald)) continue; $vald = trim($vald); if (empty($valresult[$vald])) $valresult[$vald] = $vald; } // Release memory no longer required unset($home_net); // Sort the list and return it natsort($valresult); return $valresult; } function suricata_rules_up_install_cron($should_install=true) { global $config, $g; $command = "/usr/bin/nice -n20 /usr/local/bin/php -f /usr/local/www/suricata/suricata_check_for_rule_updates.php"; // Get auto-rule update parameter from configuration $suricata_rules_up_info_ck = $config['installedpackages']['suricata']['config'][0]['autoruleupdate']; // See if a customized start time has been set for rule file updates if (!empty($config['installedpackages']['suricata']['config'][0]['autoruleupdatetime'])) $suricata_rules_upd_time = $config['installedpackages']['suricata']['config'][0]['autoruleupdatetime']; else $suricata_rules_upd_time = "00:03"; if ($suricata_rules_up_info_ck == "6h_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $hour = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_hr = strval($hour); for ($i=0; $i<3; $i++) { $hour += 6; if ($hour > 24) $hour -= 24; $suricata_rules_up_hr .= "," . strval($hour); } $suricata_rules_up_mday = "*"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } if ($suricata_rules_up_info_ck == "12h_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $hour = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_hr = strval($hour) . ","; $hour += 12; if ($hour > 24) $hour -= 24; $suricata_rules_up_hr .= strval($hour); $suricata_rules_up_mday = "*"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } if ($suricata_rules_up_info_ck == "1d_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $suricata_rules_up_hr = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_mday = "*/1"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } if ($suricata_rules_up_info_ck == "4d_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $suricata_rules_up_hr = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_mday = "*/4"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } if ($suricata_rules_up_info_ck == "7d_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $suricata_rules_up_hr = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_mday = "*/7"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } if ($suricata_rules_up_info_ck == "28d_up") { $suricata_rules_up_min = intval(substr($suricata_rules_upd_time, -2)); $suricata_rules_up_hr = intval(substr($suricata_rules_upd_time, 0, 2)); $suricata_rules_up_mday = "*/28"; $suricata_rules_up_month = "*"; $suricata_rules_up_wday = "*"; } // System call to manage the cron job. install_cron_job($command, $should_install, $suricata_rules_up_min, $suricata_rules_up_hr, $suricata_rules_up_mday, $suricata_rules_up_month, $suricata_rules_up_wday, "root"); } function suricata_loglimit_install_cron($should_install=true) { install_cron_job("/usr/bin/nice -n20 /usr/local/bin/php -f /usr/local/pkg/suricata/suricata_check_cron_misc.inc", $should_install, "*/5"); } function suricata_rm_blocked_install_cron($should_install) { global $config, $g; $suri_pf_table = SURICATA_PF_TABLE; $suricata_rm_blocked_info_ck = $config['installedpackages']['suricata']['config'][0]['rm_blocked']; if ($suricata_rm_blocked_info_ck == "15m_b") { $suricata_rm_blocked_min = "*/1"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "900"; } if ($suricata_rm_blocked_info_ck == "30m_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "1800"; } if ($suricata_rm_blocked_info_ck == "1h_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "3600"; } if ($suricata_rm_blocked_info_ck == "3h_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "10800"; } if ($suricata_rm_blocked_info_ck == "6h_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "21600"; } if ($suricata_rm_blocked_info_ck == "12h_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "43200"; } if ($suricata_rm_blocked_info_ck == "1d_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "86400"; } if ($suricata_rm_blocked_info_ck == "4d_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "345600"; } if ($suricata_rm_blocked_info_ck == "7d_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "604800"; } if ($suricata_rm_blocked_info_ck == "28d_b") { $suricata_rm_blocked_min = "*/5"; $suricata_rm_blocked_hr = "*"; $suricata_rm_blocked_mday = "*"; $suricata_rm_blocked_month = "*"; $suricata_rm_blocked_wday = "*"; $suricata_rm_blocked_expire = "2419200"; } // First, remove any existing cron task for "rm_blocked" hosts install_cron_job("pfctl -t {$suri_pf_table} -T expire" , false); // Now add or update the cron task for "rm_blocked" hosts // if enabled. if ($should_install) { $command = "/usr/bin/nice -n20 /sbin/pfctl -t {$suri_pf_table} -T expire {$suricata_rm_blocked_expire}"; install_cron_job($command, $should_install, $suricata_rm_blocked_min, $suricata_rm_blocked_hr, $suricata_rm_blocked_mday, $suricata_rm_blocked_month, $suricata_rm_blocked_wday, "root"); } } function sync_suricata_package_config() { global $config, $g; $suricatadir = SURICATADIR; $rcdir = RCFILEPREFIX; conf_mount_rw(); // Do not start config build if there are no Suricata-configured interfaces if (!is_array($config['installedpackages']['suricata']) || !is_array($config['installedpackages']['suricata']['rule'])) { @unlink("{$rcdir}/suricata.sh"); conf_mount_ro(); return; } $suricataconf = $config['installedpackages']['suricata']['rule']; foreach ($suricataconf as $value) { $if_real = get_real_interface($value['interface']); // create a suricata.yaml file for interface suricata_generate_yaml($value); // create barnyard2.conf file for interface if ($value['barnyard_enable'] == 'on') suricata_generate_barnyard2_conf($value, $if_real); } // create suricata bootup file suricata.sh suricata_create_rc(); $suricataglob = $config['installedpackages']['suricata']['config'][0]; // setup the log directory size check job if enabled suricata_loglimit_install_cron(true); // setup the suricata rules update job if enabled suricata_rules_up_install_cron($config['installedpackages']['suricata']['config'][0]['autoruleupdate'] != "never_up" ? true : false); // set the suricata blocked hosts time suricata_rm_blocked_install_cron($config['installedpackages']['suricata']['config'][0]['rm_blocked'] != "never_b" ? true : false); write_config(); configure_cron(); // Do not attempt package sync if reinstalling package or booting // if (!$g['suricata_postinstall'] && !$g['booting']) // suricata_sync_on_changes(); conf_mount_ro(); } function suricata_load_suppress_sigs($suricatacfg, $track_by=false) { global $config; /**********************************************************/ /* This function loads the GEN_ID and SIG_ID for all the */ /* suppressed alert entries from the Suppression List of */ /* the passed Suricata interface. The results are */ /* returned in an array with GEN_ID and SIG_ID as the */ /* primary keys. Any "track by_src" or "track by_dst" */ /* entries in the Suppression List are tacked on as */ /* additional keys in the array along with the IP address */ /* in either IPv4 or IPv6 format when $track_by is passed */ /* as true. */ /* */ /* Sample returned array: */ /* $suppress[1][2069] = "suppress" */ /* $suppress[1][2070]['by_src']['10.1.1.5'] = "suppress" */ /* $suppress[1][2070]['by_dst']['10.1.1.6'] = "suppress" */ /* */ /**********************************************************/ $suppress = array(); if (!is_array($config['installedpackages']['suricata'])) return; if (!is_array($config['installedpackages']['suricata']['suppress'])) return; if (!is_array($config['installedpackages']['suricata']['suppress']['item'])) return; $a_suppress = $config['installedpackages']['suricata']['suppress']['item']; foreach ($a_suppress as $a_id => $alist) { if ($alist['name'] == $suricatacfg['suppresslistname']) { if (!empty($alist['suppresspassthru'])) { $tmplist = str_replace("\r", "", base64_decode($alist['suppresspassthru'])); $tmp = explode("\n", $tmplist); foreach ($tmp as $line) { // Skip any blank lines if (trim($line, " \n") == "") continue; // Skip any comment lines if (preg_match('/^\s*#/', $line)) continue; /* See if entry suppresses GID:SID for all hosts */ if (preg_match('/\s*suppress\s*gen_id\b\s*(\d+),\s*sig_id\b\s*(\d+)\s*$/i', $line, $matches)) { $genid = $matches[1]; $sigid = $matches[2]; if (!empty($genid) && !empty($sigid)) { if (!is_array($suppress[$genid])) $suppress[$genid] = array(); if (!is_array($suppress[$genid][$sigid])) $suppress[$genid][$sigid] = array(); $suppress[$genid][$sigid] = "suppress"; } } /* Get "track by IP" entries if requested */ if ($track_by) { /* See if entry suppresses only by SRC or DST IPv4 address */ if (preg_match('/\s*suppress\s*gen_id\b\s*(\d+),\s*sig_id\b\s*(\d+),\s*track\s*(by_src|by_dst),\s*ip\s*(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s*$/i', $line, $matches)) { $genid = $matches[1]; $sigid = $matches[2]; $whichip = trim($matches[3]); $ip = $matches[4]; if (!empty($genid) && !empty($sigid) && !empty($whichip) && !empty($ip)) { if (!is_array($suppress[$genid])) $suppress[$genid] = array(); if (!is_array($suppress[$genid][$sigid])) $suppress[$genid][$sigid] = array(); if (!is_array($suppress[$genid][$sigid][$whichip])) $suppress[$genid][$sigid][$whichip] = array(); if (!is_array($suppress[$genid][$sigid][$whichip][$ip])) $suppress[$genid][$sigid][$whichip][$ip] = array(); $suppress[$genid][$sigid][$whichip][$ip] = "suppress"; } } /* See if entry suppresses only by SRC or DST IPv6 address */ if (preg_match('/\s*suppress\s*gen_id\b\s*(\d+),\s*sig_id\b\s*(\d+),\s*track\s*(by_src|by_dst),\s*ip\s*([0-9a-f\.:]+)\s*$/i', $line, $matches)) { $genid = $matches[1]; $sigid = $matches[2]; $whichip = trim($matches[3]); $ip = trim($matches[4]); if (!empty($genid) && !empty($sigid) && !empty($whichip) && !empty($ip)) { if (!is_array($suppress[$genid])) $suppress[$genid] = array(); if (!is_array($suppress[$genid][$sigid])) $suppress[$genid][$sigid] = array(); if (!is_array($suppress[$genid][$sigid][$whichip])) $suppress[$genid][$sigid][$whichip] = array(); if (!is_array($suppress[$genid][$sigid][$whichip][$ip])) $suppress[$genid][$sigid][$whichip][$ip] = array(); $suppress[$genid][$sigid][$whichip][$ip] = "suppress"; } } } } unset($tmp); } break; } } unset($alist); return $suppress; } function suricata_post_delete_logs($suricata_uuid = 0) { /***********************************************/ /* This function cleans up related log files */ /* for the passed instance. These include */ /* Barnyard2 unified2 logs and pcap logs. */ /***********************************************/ global $config, $g; // do nothing if no Suricata interfaces active if (!is_array($config['installedpackages']['suricata']['rule'])) return; foreach ($config['installedpackages']['suricata']['rule'] as $value) { if ($value['uuid'] != $suricata_uuid) continue; $if_real = get_real_interface($value['interface']); $suricata_log_dir = SURICATALOGDIR . "suricata_{$if_real}{$suricata_uuid}"; if ($if_real != '') { /* Clean-up Barnyard2 files if any exist */ $filelist = glob("{$suricata_log_dir}/unified2.alert.*"); // Keep most recent file unset($filelist[count($filelist) - 1]); foreach ($filelist as $file) @unlink($file); /* Clean-up Barnyard2 archived files if any exist */ $filelist = glob("{$suricata_log_dir}/barnyard2/archive/unified2.alert.*"); foreach ($filelist as $file) @unlink($file); /* Clean-up packet capture files if any exist */ $filelist = glob("{$suricata_log_dir}/log.pcap.*"); // Keep most recent file unset($filelist[count($filelist) - 1]); foreach ($filelist as $file) @unlink($file); unset($filelist); } } } /* This returns size of passed directory or file in 1024-byte blocks */ function suricata_Getdirsize($node) { if(!is_readable($node)) return false; $blah = exec( "/usr/bin/du -kdc $node" ); return substr( $blah, 0, strpos($blah, 9) ); } function suricata_build_sid_msg_map($rules_path, $sid_file) { /*************************************************************/ /* This function reads all the rules file in the passed */ /* $rules_path variable and produces a properly formatted */ /* sid-msg.map v2 file for use by Suricata and barnyard2. */ /* */ /* This function produces the new v2 format sid-msg.map */ /* with the field layout as follows: */ /* */ /* GID || SID || REV || CLASSTYPE || PRI || MSG || REF ... */ /* */ /* On Entry: $rules_path --> array or directory of files */ /* or a single file containing */ /* the rules to read. */ /* $sid_file --> the complete destination path */ /* and filename for the output */ /* sid-msg.map file. */ /*************************************************************/ $sidMap = array(); $rule_files = array(); // First check if we were passed a directory, a single file // or an array of filenames to read. Set our $rule_files // variable accordingly. If we can't figure it out, return // and don't write a sid-msg.map file. if (is_string($rules_path)) { if (is_dir($rules_path)) $rule_files = glob($rules_path . "*.rules"); elseif (is_file($rules_path)) $rule_files = (array)$rules_path; } elseif (is_array($rules_path)) $rule_files = $rules_path; else return; // Read the rule files into an array, then iterate the list foreach ($rule_files as $file) { // Don't process files with "deleted" in the filename if (stristr($file, "deleted")) continue; // Read the file into an array, skipping missing files. if (!file_exists($file)) continue; $rules_array = file($file, FILE_SKIP_EMPTY_LINES); $record = ""; $b_Multiline = false; // Read and process each line from the rules in the current file foreach ($rules_array as $rule) { // Skip any non-rule lines unless we're in multiline mode. if (!preg_match('/^\s*#*\s*(alert|drop|pass)/i', $rule) && !$b_Multiline) continue; // Test for a multi-line rule, and reassemble the // pieces back into a single line. if (preg_match('/\\\\s*[\n]$/m', $rule)) { $rule = substr($rule, 0, strrpos($rule, '\\')); $record .= $rule; $b_Multiline = true; continue; } // If the last segment of a multiline rule, then // append it onto the previous parts to form a // single-line rule for further processing below. elseif (!preg_match('/\\\\s*[\n]$/m', $rule) && $b_Multiline) { $record .= $rule; $rule = $record; } $b_Multiline = false; $record = ""; // Parse the rule to find sid and any references. $gid = '1'; // default to 1 for regular rules $sid = ''; $rev = ''; $classtype = 'NOCLASS'; // required default for v2 format $priority = '0'; // required default for v2 format $msg = ''; $matches = ''; $sidEntry = ''; if (preg_match('/\bmsg\s*:\s*"(.+?)"\s*;/i', $rule, $matches)) $msg = trim($matches[1]); if (preg_match('/\bsid\s*:\s*(\d+)\s*;/i', $rule, $matches)) $sid = trim($matches[1]); if (preg_match('/\bgid\s*:\s*(\d+)\s*;/i', $rule, $matches)) $gid = trim($matches[1]); if (preg_match('/\brev\s*:\s*([^\;]+)/i', $rule, $matches)) $rev = trim($matches[1]); if (preg_match('/\bclasstype\s*:\s*([^\;]+)/i', $rule, $matches)) $classtype = trim($matches[1]); if (preg_match('/\bpriority\s*:\s*([^\;]+)/i', $rule, $matches)) $priority = trim($matches[1]); if (!empty($gid) && !empty($sid) && !empty($msg)) { $sidEntry = $gid . ' || ' . $sid . ' || ' . $rev . ' || ' . $classtype . ' || '; $sidEntry .= $priority . ' || ' . $msg; preg_match_all('/\breference\s*:\s*([^\;]+)/i', $rule, $matches); foreach ($matches[1] as $ref) $sidEntry .= " || " . trim($ref); $sidEntry .= "\n"; $sidMap[] = $sidEntry; } } } // Sort the generated sid-msg map natcasesort($sidMap); // Now print the result to the supplied file @file_put_contents($sid_file, "#v2\n# sid-msg.map file auto-generated by Suricata.\n\n"); @file_put_contents($sid_file, array_values($sidMap), FILE_APPEND); } function suricata_merge_reference_configs($cfg_in, $cfg_out) { /***********************************************************/ /* This function takes a list of "reference.config" files */ /* in the $cfg_in array and merges them into a single */ /* file specified by $cfg_out. The merging is done so */ /* no duplication of lines occurs in the output file. */ /***********************************************************/ $outMap = array(); foreach ($cfg_in as $file) { if (!file_exists($file)) continue; $in = file($file, FILE_SKIP_EMPTY_LINES); foreach ($in as $line) { /* Skip comment lines */ if (preg_match('/^\s*#/', $line)) continue; if (preg_match('/(\:)\s*(\w+)\s*(.*)/', $line, $matches)) { if (!empty($matches[2]) && !empty($matches[3])) { $matches[2] = trim($matches[2]); if (!array_key_exists($matches[2], $outMap)) { if (!is_array($outMap[$matches[2]])) $outMap[$matches[2]] = array(); $outMap[$matches[2]] = trim($matches[3]); } } } } } // Sort the new reference map. uksort($outMap,'strnatcasecmp'); // Do NOT write an empty references.config file, just // exit instead. if (empty($outMap)) return false; // Format and write it to the supplied output file. $format = "config reference: %-12s %s\n"; foreach ($outMap as $key=>$value) $outMap[$key] = sprintf($format, $key, $value); @file_put_contents($cfg_out, array_values($outMap)); return true; } function suricata_merge_classification_configs($cfg_in, $cfg_out) { /************************************************************/ /* This function takes a list of "classification.config" */ /* files in the $cfg_in array and merges them into a */ /* single file specified by $cfg_out. The merging is done */ /* so no duplication of lines occurs in the output file. */ /************************************************************/ $outMap = array(); foreach ($cfg_in as $file) { if (!file_exists($file)) continue; $in = file($file, FILE_SKIP_EMPTY_LINES); foreach ($in as $line) { if (preg_match('/(.*:)(\s*.*),(.*),(.*)/', $line, $matches)) { /* Skip comment lines */ if (preg_match('/^\s*#/', $line)) continue; if (!empty($matches[2]) && !empty($matches[3]) && !empty($matches[4])) { $matches[2] = trim($matches[2]); if (!array_key_exists($matches[2], $outMap)) { if (!is_array($outMap[$matches[2]])) $outMap[$matches[2]] = array(); $outMap[$matches[2]] = trim($matches[3]) . "," . trim($matches[4]); } } } } } // Sort the new classification map. uksort($outMap,'strnatcasecmp'); // Do NOT write an empty classification.config file, just // exit instead. if (empty($outMap)) return false; // Format and write it to the supplied output file. $format = "config classification: %s,%s\n"; foreach ($outMap as $key=>$value) $outMap[$key] = sprintf($format, $key, $value); @file_put_contents($cfg_out, array_values($outMap)); return true; } function suricata_load_rules_map($rules_path) { /***************************************************************/ /* This function loads and returns an array with all the rules */ /* found in the *.rules files in the passed rules path. */ /* */ /* $rules_path can be: */ /* a directory (assumed to contain *.rules files) */ /* a filename (identifying a specific *.rules file) */ /* an array of filenames (identifying *.rules files) */ /***************************************************************/ $map_ref = array(); $rule_files = array(); if (empty($rules_path)) return $map_ref; /*************************************************************** * Read all the rules into the map array. * The structure of the map array is: * * map[gid][sid]['rule']['category']['disabled']['flowbits'] * * where: * gid = Generator ID from rule, or 1 if general text * rule * sid = Signature ID from rule * rule = Complete rule text * category = File name of file containing the rule * action = alert, drop, reject or pass * disabled = 1 if rule is disabled (commented out), 0 if * rule is enabled * flowbits = Array of applicable flowbits if rule contains * flowbits options ***************************************************************/ // First check if we were passed a directory, a single file // or an array of filenames to read. Set our $rule_files // variable accordingly. If we can't figure it out, return // an empty rules map array. if (is_string($rules_path)) { if (is_dir($rules_path)) $rule_files = glob($rules_path . "*.rules"); elseif (is_file($rules_path)) $rule_files = (array)$rules_path; } elseif (is_array($rules_path)) $rule_files = $rules_path; else return $map_ref; // Read the rule files into an array, then iterate the list // to process the rules from the files one-by-one. foreach ($rule_files as $file) { // Don't process files with "deleted" in the filename. if (stristr($file, "deleted")) continue; // Read the file contents into an array, skipping // missing files. if (!file_exists($file)) continue; $rules_array = file($file, FILE_SKIP_EMPTY_LINES); $record = ""; $b_Multiline = false; // Read and process each line from the rules in the // current file into an array. foreach ($rules_array as $rule) { // Skip any lines that may be just spaces. if (trim($rule, " \n") == "") continue; // Skip any non-rule lines unless we're in // multiline mode. if (!preg_match('/^\s*#*\s*(alert|drop|pass|reject)/i', $rule) && !$b_Multiline) continue; // Test for a multi-line rule; loop and reassemble // the pieces back into a single line. if (preg_match('/\\\\s*[\n]$/m', $rule)) { $rule = substr($rule, 0, strrpos($rule, '\\')); $record .= $rule; $b_Multiline = true; continue; } // If the last segment of a multiline rule, then // append it onto the previous parts to form a // single-line rule for further processing below. elseif (!preg_match('/\\\\s*[\n]$/m', $rule) && $b_Multiline) { $record .= $rule; $rule = $record; } // We have an actual single-line rule, or else a // re-assembled multiline rule that is now a // single-line rule, so store it in our rules map. // Get and test the SID. If we don't find one, // ignore and skip this rule as it is invalid. $sid = suricata_get_sid($rule); if (empty($sid)) { $b_Multiline = false; $record = ""; continue; } $gid = suricata_get_gid($rule); if (!is_array($map_ref[$gid])) $map_ref[$gid] = array(); if (!is_array($map_ref[$gid][$sid])) $map_ref[$gid][$sid] = array(); $map_ref[$gid][$sid]['rule'] = $rule; $map_ref[$gid][$sid]['category'] = basename($file, ".rules"); // Grab the rule action $matches = array(); if (preg_match('/^\s*#*\s*(alert|drop|pass|reject)/i', $rule, $matches)) $map_ref[$gid][$sid]['action'] = $matches[1]; else $map_ref[$gid][$sid]['action'] = ""; // Determine if default state is "disabled" if (preg_match('/^\s*\#+/', $rule)) $map_ref[$gid][$sid]['disabled'] = 1; else $map_ref[$gid][$sid]['disabled'] = 0; // Grab any associated flowbits from the rule. $map_ref[$gid][$sid]['flowbits'] = suricata_get_flowbits($rule); // Reset our local flag and record variables // for the next rule in the set. $b_Multiline = false; $record = ""; } // Zero out our processing array and get the next file. unset($rules_array); } return $map_ref; } function suricata_get_gid($rule) { /****************************************************************/ /* If a gid is defined, then return it, else default to "1" for */ /* general text rules match. */ /****************************************************************/ if (preg_match('/\bgid\s*:\s*(\d+)\s*;/i', $rule, $matches)) return trim($matches[1]); else return "1"; } function suricata_get_sid($rule) { /***************************************************************/ /* If a sid is defined, then return it, else default to an */ /* empty value. */ /***************************************************************/ if (preg_match('/\bsid\s*:\s*(\d+)\s*;/i', $rule, $matches)) return trim($matches[1]); else return ""; } function suricata_get_msg($rule) { /**************************************************************/ /* Return the MSG section of the passed rule as a string. */ /**************************************************************/ $msg = ""; if (preg_match('/\bmsg\s*:\s*"(.+?)"\s*;/i', $rule, $matches)) $msg = trim($matches[1]); return $msg; } function suricata_get_flowbits($rule) { /*************************************************************/ /* This will pull out "flowbits:" options from the rule text */ /* and return them in an array (minus the "flowbits:" part). */ /*************************************************************/ $flowbits = array(); // Grab any "flowbits:set, setx, unset, isset or toggle" options first. // Examine flowbits targets for logical operators to capture all targets. if (preg_match_all('/flowbits\b\s*:\s*(set|setx|unset|toggle|isset|isnotset)\s*,([^;]+)/i', $rule, $matches)) { $i = -1; while (++$i < count($matches[1])) { $action = trim($matches[1][$i]); $target = preg_split('/[&|]/', $matches[2][$i]); foreach ($target as $t) $flowbits[] = "{$action}," . trim($t); } } // Include the "flowbits:noalert or reset" options, if present. if (preg_match_all('/flowbits\b\s*:\s*(noalert|reset)\b/i', $rule, $matches)) { $i = -1; while (++$i < count($matches[1])) { $flowbits[] = trim($matches[1][$i]); } } return $flowbits; } function suricata_get_checked_flowbits($rules_map) { /*************************************************************/ /* This function checks all the currently enabled rules to */ /* find any checked flowbits, and returns the checked */ /* flowbit names in an array. */ /*************************************************************/ $checked_flowbits = array(); foreach ($rules_map as $rulem) { if (!is_array($rulem)) continue; foreach ($rulem as $rulem2) { if (!is_array($rulem2)) continue; if ($rulem2['disabled'] == 1) continue; if (empty($rulem2['flowbits'])) continue; if (!is_array($rulem2['flowbits'])) continue; foreach ($rulem2['flowbits'] as $flowbit) { if (empty($flowbit)) continue; // If no comma in flowbits option, then skip it. $pos = strpos($flowbit, ","); if ($pos === false) continue; $action = substr(strtolower($flowbit), 0, $pos); if ($action == "isset" || $action == "isnotset") { $target = preg_split('/[&|]/', substr($flowbit, $pos + 1)); foreach ($target as $t) if (!empty($t) && !isset($checked_flowbits[$t])) { if (!is_array($checked_flowbits[$t])) $checked_flowbits[$t] = array(); $checked_flowbits[$t] = $action; } } } } } unset($rulem, $rulem2); return $checked_flowbits; } function suricata_get_set_flowbits($rules_map) { /*********************************************************/ /* This function checks all the currently enabled rules */ /* to find any set flowbits, and returns the flowbit */ /* names in an array. */ /*********************************************************/ $set_flowbits = array(); foreach ($rules_map as $rulem) { if (!is_array($rulem)) continue; foreach ($rulem as $rulem2) { if ($rulem2['disabled'] == 1) continue; if (empty($rulem2['flowbits'])) continue; if (!is_array($rulem2['flowbits'])) continue; foreach ($rulem2['flowbits'] as $flowbit) { if (empty($flowbit)) continue; /* If no comma in flowbits option, then skip it. */ $pos = strpos($flowbit, ","); if ($pos === false) continue; $action = substr(strtolower($flowbit), 0, $pos); if ($action == "set" || $action == "toggle" || $action == "setx") { $target = preg_split('/[&|]/', substr($flowbit, $pos + 1)); foreach ($target as $t) if (!empty($t) && !isset($set_flowbits[$t])) { if (!is_array($set_flowbits[$t])) $set_flowbits[$t] = array(); $set_flowbits[$t] = $action; } } } } } unset($rulem, $rulem2); return $set_flowbits; } function suricata_find_flowbit_required_rules($rules, $unchecked_flowbits) { /********************************************************/ /* This function finds all rules that must be enabled */ /* in order to satisfy the "checked flowbits" used by */ /* the currently enabled rules. It returns the list */ /* of required rules in an array. */ /********************************************************/ $required_flowbits_rules = array(); foreach ($rules as $k1 => $rule) { if (!is_array($rule)) continue; foreach ($rule as $k2 => $rule2) { if (empty($rule2['flowbits'])) continue; if (!is_array($rule2['flowbits'])) continue; foreach ($rule2['flowbits'] as $flowbit) { if (empty($flowbit)) continue; $action = substr($flowbit, 0, strpos($flowbit, ",")); if (!strcasecmp(substr($action, 0, 3), "set")) { $tmp = substr($flowbit, strpos($flowbit, ",") +1 ); if (!empty($tmp) && isset($unchecked_flowbits[$tmp])) { if (!is_array($required_flowbits_rules[$k1])) $required_flowbits_rules[$k1] = array(); if (!is_array($required_flowbits_rules[$k1][$k2])) $required_flowbits_rules[$k1][$k2] = array(); $required_flowbits_rules[$k1][$k2]['category'] = $rule2['category']; if ($rule2['disabled'] == 0) // If not disabled, just return the rule text "as is" $required_flowbits_rules[$k1][$k2]['rule'] = ltrim($rule2['rule']); else { // If rule is disabled, remove leading '#' to enable it $required_flowbits_rules[$k1][$k2]['rule'] = ltrim(substr($rule2['rule'], strpos($rule2['rule'], "#") + 1)); $required_flowbits_rules[$k1][$k2]['disabled'] = 0; } } } } } } unset($rule, $rule2); return $required_flowbits_rules; } function suricata_resolve_flowbits($rules, $active_rules) { /******************************************************/ /* This function auto-resolves flowbit requirements */ /* by finding all checked flowbits in the currently */ /* enabled rules, and then making sure all the "set" */ /* flowbit rules for those "checked" flowbits are */ /* enabled. For any that are not enabled, they are */ /* copied to an array, enabled, and returned. */ /* */ /* $active_rules --> Rules Map array containing */ /* the current rules for the */ /* interface to resolve flowbit */ /* dependencies for. */ /* */ /* $rules --> Rules Map array containing */ /* all the available rules. */ /******************************************************/ $suricatadir = SURICATADIR; // Check $rules array to be sure it is filled. if (empty($rules)) { log_error(gettext("[Suricata] WARNING: Flowbit resolution not done - no rules in {$suricatadir}rules/ ...")); return array(); } // First, find all the "checked" and "set" flowbits. $checked_flowbits = suricata_get_checked_flowbits($active_rules); $set_flowbits = suricata_get_set_flowbits($active_rules); // Next find any "checked" flowbits without matching // "set" flowbit rules in the enabled rule set. $delta_flowbits = array_diff_key($checked_flowbits, $set_flowbits); // Cleanup and release the memory we no longer need. unset($checked_flowbits); unset($set_flowbits); // Now find all the needed "set flowbit" rules from // the master list of all rules. $required_rules = suricata_find_flowbit_required_rules($rules, $delta_flowbits); // Cleanup and release memory we no longer need. unset($delta_flowbits); return $required_rules; } function suricata_write_flowbit_rules_file($flowbit_rules, $rule_file) { /************************************************/ /* This function takes an array of rules in the */ /* rules_map format and writes them to the file */ /* given. */ /* */ /* $flowbit_rules --> array of flowbit-required */ /* rules. */ /* */ /* $rule_file --> filename to write the */ /* flowbit-required rules */ /* to. */ /************************************************/ $flowbit_rules_file = FLOWBITS_FILENAME; // See if we were passed a directory or full // filename to write the rules to, and adjust // the destination argument accordingly. if (is_dir($rule_file)) $rule_file = rtrim($rule_file, '/')."/{$flowbit_rules_file}"; if (empty($flowbit_rules)) { @file_put_contents($rule_file, ""); return; } $fp = fopen($rule_file, "w"); if ($fp) { @fwrite($fp, "# These rules set flowbits checked by your other enabled rules. If the\n"); @fwrite($fp, "# dependent flowbits are not set, then some of your chosen rules may\n"); @fwrite($fp, "# not fire. Enabling all rules that set these dependent flowbits ensures\n"); @fwrite($fp, "# your chosen rules fire as intended.\n#\n"); @fwrite($fp, "# If you wish to prevent alerts from any of these rules, add the GID:SID\n"); @fwrite($fp, "# of the rule to the Suppression List for the interface.\n"); foreach ($flowbit_rules as $k1 => $rule) { foreach ($rule as $k2 => $rule2) { @fwrite($fp, "\n# Category: {$rule2['category']}"); @fwrite($fp, " GID:{$k1} SID:{$k2}\n"); @fwrite($fp, $rule2['rule']); } } fclose($fp); } } function suricata_load_vrt_policy($policy, $all_rules=null) { /************************************************/ /* This function returns an array of all rules */ /* marked with the passed in $policy metadata. */ /* */ /* $policy --> desired VRT security policy */ /* 1. connectivity */ /* 2. balanced */ /* 3. security */ /* */ /* $all_rules --> optional Rules Map array of */ /* rules to scan for policy. */ /* If not provided, then an */ /* array will be created. */ /************************************************/ $suricatadir = SURICATADIR; $vrt_policy_rules = array(); // Load a map of all the VRT rules if we were // not passed a pre-loaded one to use. if (is_null($all_rules)) { /* Since only Snort VRT rules have IPS Policy metadata, */ /* limit our search to just those files. */ $suricata_file_pattern = VRT_FILE_PREFIX . "*.rules"; $suricata_vrt_files = glob("{$suricatadir}rules/{$suricata_file_pattern}"); $all_rules = suricata_load_rules_map($suricata_vrt_files); } // Now walk the rules list and find all those that are // defined as active for the chosen security policy. foreach ($all_rules as $k1 => $arulem) { foreach ($arulem as $k2 => $arulem2) { if (strripos($arulem2['rule'], "policy {$policy}-ips") !== false) { if (!preg_match('/flowbits\s*:\s*noalert/i', $arulem2['rule'])) { if (!is_array($vrt_policy_rules[$k1])) $vrt_policy_rules[$k1] = array(); if (!is_array($vrt_policy_rules[$k1][$k2])) $vrt_policy_rules[$k1][$k2] = array(); $vrt_policy_rules[$k1][$k2] = $arulem2; // Enable the policy rule if disabled if ($arulem2['disabled'] == 1) { $vrt_policy_rules[$k1][$k2]['rule'] = ltrim(substr($arulem2['rule'], strpos($arulem2['rule'], "#") + 1)); $vrt_policy_rules[$k1][$k2]['disabled'] = 0; } } } } } // Release memory we no longer need. unset($arulem, $arulem2); // Return all the rules that match the policy. return $vrt_policy_rules; } function suricata_load_sid_mods($sids) { /*****************************************/ /* This function parses the string of */ /* SID values in $sids and returns an */ /* array with the SID as the key and */ /* value. The SID values in $sids are */ /* assumed to be delimited by "||". */ /* */ /* $sids ==> string of SID values from */ /* saved config file. */ /* */ /* Returns ==> a multidimensional array */ /* with GID and SID as the */ /* keys ($result[GID][SID]) */ /*****************************************/ $result = array(); if (empty($sids)) return $result; $tmp = explode("||", $sids); foreach ($tmp as $v) { if (preg_match('/(\d+)\s*:\s*(\d+)/', $v, $match)) { if (!is_array($result[$match[1]])) $result[$match[1]] = array(); $result[$match[1]][$match[2]] = "{$match[1]}:{$match[2]}"; } } unset($tmp); return $result; } function suricata_modify_sids(&$rule_map, $suricatacfg) { /*****************************************/ /* This function modifies the rules in */ /* the passed rules_map array based on */ /* values in the enablesid/disablesid */ /* configuration parameters. */ /* */ /* $rule_map = array of current rules */ /* $suricatacfg = config settings */ /*****************************************/ if (!isset($suricatacfg['rule_sid_on']) && !isset($suricatacfg['rule_sid_off'])) return; // Load up our enablesid and disablesid // arrays with lists of modified SIDs. $enablesid = suricata_load_sid_mods($suricatacfg['rule_sid_on'], "enablesid"); $disablesid = suricata_load_sid_mods($suricatacfg['rule_sid_off'], "disablesid"); /* Turn on any rules that need to be */ /* forced "on" with enablesid mods. */ if (!empty($enablesid)) { foreach ($rule_map as $k1 => $rulem) { foreach ($rulem as $k2 => $v) { if (isset($enablesid[$k1][$k2]) && $v['disabled'] == 1) { $rule_map[$k1][$k2]['rule'] = ltrim($v['rule'], " \t#"); $rule_map[$k1][$k2]['disabled'] = 0; } } } } /* Turn off any rules that need to be */ /* forced "off" with disablesid mods. */ if (!empty($disablesid)) { foreach ($rule_map as $k1 => $rulem) { foreach ($rulem as $k2 => $v) { if (isset($disablesid[$k1][$k2]) && $v['disabled'] == 0) { $rule_map[$k1][$k2]['rule'] = "# " . $v['rule']; $rule_map[$k1][$k2]['disabled'] = 1; } } } } unset($enablesid, $disablesid); } function suricata_prepare_rule_files($suricatacfg, $suricatacfgdir) { /***********************************************************/ /* This function builds a new set of enforcing rules for */ /* Suricata and writes them to disk. */ /* */ /* $suricatacfg --> pointer to applicable section of */ /* config.xml containing settings for */ /* the interface. */ /* */ /* $suricatacfgdir --> pointer to physical directory on */ /* disk where Suricata configuration is */ /* to be written. */ /***********************************************************/ global $rebuild_rules; $suricatadir = SURICATADIR; $flowbit_rules_file = FLOWBITS_FILENAME; $suricata_enforcing_rules_file = ENFORCING_RULES_FILENAME; $no_rules_defined = true; // If there is no reason to rebuild the rules, exit to save time. if (!$rebuild_rules) return; // Log a message for rules rebuild in progress log_error(gettext("[Suricata] Updating rules configuration for: " . convert_friendly_interface_to_friendly_descr($suricatacfg['interface']) . " ...")); // Only rebuild rules if some are selected or an IPS Policy is enabled if (!empty($suricatacfg['rulesets']) || $suricatacfg['ips_policy_enable'] == 'on') { $enabled_rules = array(); $enabled_files = array(); $all_rules = array(); $no_rules_defined = false; // Load up all the rules into a Rules Map array. $all_rules = suricata_load_rules_map("{$suricatadir}rules/"); // Create an array with the filenames of the enabled // rule category files if we have any. if (!empty($suricatacfg['rulesets'])) { foreach (explode("||", $suricatacfg['rulesets']) as $file){ $category = basename($file, ".rules"); if (!is_array($enabled_files[$category])) $enabled_files[$category] = array(); $enabled_files[$category] = $file; } /****************************************************/ /* Walk the ALL_RULES map array and copy the rules */ /* matching our selected file categories to the */ /* ENABLED_RULES map array. */ /****************************************************/ foreach ($all_rules as $k1 => $rulem) { foreach ($rulem as $k2 => $v) { if (isset($enabled_files[$v['category']])) { if (!is_array($enabled_rules[$k1])) $enabled_rules[$k1] = array(); if (!is_array($enabled_rules[$k1][$k2])) $enabled_rules[$k1][$k2] = array(); $enabled_rules[$k1][$k2]['rule'] = $v['rule']; $enabled_rules[$k1][$k2]['category'] = $v['category']; $enabled_rules[$k1][$k2]['disabled'] = $v['disabled']; $enabled_rules[$k1][$k2]['flowbits'] = $v['flowbits']; } } } // Release memory we no longer need. unset($enabled_files, $rulem, $v); } // Check if a pre-defined Snort VRT policy is selected. If so, // add all the VRT policy rules to our enforcing rule set. if (!empty($suricatacfg['ips_policy'])) { $policy_rules = suricata_load_vrt_policy($suricatacfg['ips_policy'], $all_rules); foreach ($policy_rules as $k1 => $policy) { foreach ($policy as $k2 => $p) { if (!is_array($enabled_rules[$k1])) $enabled_rules[$k1] = array(); if (!is_array($enabled_rules[$k1][$k2])) $enabled_rules[$k1][$k2] = array(); $enabled_rules[$k1][$k2]['rule'] = $p['rule']; $enabled_rules[$k1][$k2]['category'] = $p['category']; $enabled_rules[$k1][$k2]['disabled'] = $p['disabled']; $enabled_rules[$k1][$k2]['flowbits'] = $p['flowbits']; } } unset($policy_rules, $policy, $p); } // Process any enablesid or disablesid modifications for the selected rules. suricata_modify_sids($enabled_rules, $suricatacfg); // Write the enforcing rules file to the Suricata interface's "rules" directory. suricata_write_enforcing_rules_file($enabled_rules, "{$suricatacfgdir}/rules/{$suricata_enforcing_rules_file}"); // If auto-flowbit resolution is enabled, generate the dependent flowbits rules file. if ($suricatacfg['autoflowbitrules'] == 'on') { log_error('[Suricata] Enabling any flowbit-required rules for: ' . convert_friendly_interface_to_friendly_descr($suricatacfg['interface']) . '...'); $fbits = suricata_resolve_flowbits($all_rules, $enabled_rules); // Check for and disable any flowbit-required rules the user has // manually forced to a disabled state. suricata_modify_sids($fbits, $suricatacfg); suricata_write_flowbit_rules_file($fbits, "{$suricatacfgdir}/rules/{$flowbit_rules_file}"); unset($fbits); } else // Just put an empty file to always have the file present suricata_write_flowbit_rules_file(array(), "{$suricatacfgdir}/rules/{$flowbit_rules_file}"); } else { suricata_write_enforcing_rules_file(array(), "{$suricatacfgdir}/rules/{$suricata_enforcing_rules_file}"); suricata_write_flowbit_rules_file(array(), "{$suricatacfgdir}/rules/{$flowbit_rules_file}"); } if (!empty($suricatacfg['customrules'])) { @file_put_contents("{$suricatacfgdir}/rules/custom.rules", base64_decode($suricatacfg['customrules'])); $no_rules_defined = false; } else @file_put_contents("{$suricatacfgdir}/rules/custom.rules", ""); // Log a warning if the interface has no rules defined or enabled if ($no_rules_defined) log_error(gettext("[Suricata] Warning - no text rules selected for: " . convert_friendly_interface_to_friendly_descr($suricatacfg['interface']) . " ...")); // Build a new sid-msg.map file from the enabled // rules and copy it to the interface directory. log_error(gettext("[Suricata] Building new sig-msg.map file for " . convert_friendly_interface_to_friendly_descr($suricatacfg['interface']) . "...")); suricata_build_sid_msg_map("{$suricatacfgdir}/rules/", "{$suricatacfgdir}/sid-msg.map"); } function suricata_write_enforcing_rules_file($rule_map, $rule_path) { /************************************************/ /* This function takes a rules map array of */ /* the rules chosen for the active rule set */ /* and writes them out to the passed path. */ /* */ /* $rule_map --> Rules Map array of rules to */ /* write to disk. */ /* */ /* $rule_path --> filename or directory where */ /* rules file will be written. */ /************************************************/ $rule_file = "/" . ENFORCING_RULES_FILENAME; // See if we were passed a directory or full // filename to write the rules to, and adjust // the destination argument accordingly. if (is_dir($rule_path)) $rule_file = rtrim($rule_path, '/').$rule_file; else $rule_file = $rule_path; // If the $rule_map array is empty, then exit. if (empty($rule_map)) { file_put_contents($rule_file, ""); return; } $fp = fopen($rule_file, "w"); if ($fp) { @fwrite($fp, "# These rules are your current set of enforced rules for the protected\n"); @fwrite($fp, "# interface. This list was compiled from the categories selected on the\n"); @fwrite($fp, "# CATEGORIES tab of the Suricata configuration for the interface and/or any\n"); @fwrite($fp, "# chosen Snort VRT pre-defined IPS Policy.\n#\n"); @fwrite($fp, "# Any enablesid or disablesid customizations you made have been applied\n"); @fwrite($fp, "# to the rules in this file.\n\n"); foreach ($rule_map as $rulem) { foreach ($rulem as $rulem2) { /* No reason to write disabled rules to enforcing file, so skip them. */ if ($rulem2['disabled'] == 1) continue; @fwrite($fp, $rulem2['rule']); } } fclose($fp); } } function suricata_create_rc() { /************************************************************/ /* This function builds the /usr/local/etc/rc.d/suricata.sh */ /* shell script for starting and stopping Suricata. The */ /* script is rebuilt on each package sync operation and */ /* after any changes to suricata.conf saved in the GUI. */ /************************************************************/ global $config, $g; $suricatadir = SURICATADIR; $suricatalogdir = SURICATALOGDIR; $rcdir = RCFILEPREFIX; // If no interfaces are configured for Suricata, exit if (!is_array($config['installedpackages']['suricata']['rule'])) return; $suricataconf = $config['installedpackages']['suricata']['rule']; if (empty($suricataconf)) return; // At least one interface is configured, so OK $start_suricata_iface_start = array(); $start_suricata_iface_stop = array(); // Loop thru each configured interface and build // the shell script. foreach ($suricataconf as $value) { // Skip disabled Suricata interfaces if ($value['enable'] <> 'on') continue; $suricata_uuid = $value['uuid']; $if_real = get_real_interface($value['interface']); $start_barnyard = <</dev/null; do sleep 1 time=\$((time+1)) if [ \$time -gt \$timeout ]; then break fi done if [ -f /var/run/barnyard2_{$if_real}{$suricata_uuid}.pid ]; then /bin/rm /var/run/barnyard2_{$if_real}{$suricata_uuid}.pid fi else pid=`/bin/pgrep -fn "barnyard2 -r {$suricata_uuid} "` if [ ! -z \$pid ]; then /bin/pkill -TERM -fn "barnyard2 -r {$suricata_uuid} " time=0 timeout=30 while /bin/kill -TERM \$pid 2>/dev/null; do sleep 1 time=\$((time+1)) if [ \$time -gt \$timeout ]; then break fi done fi fi EOE; if ($value['barnyard_enable'] == 'on') $start_barnyard2 = $start_barnyard; else $start_barnyard2 = $stop_barnyard2; $start_suricata_iface_start[] = <</dev/null; do sleep 1 time=\$((time+1)) if [ \$time -gt \$timeout ]; then break fi done if [ -f /var/run/suricata_{$if_real}{$suricata_uuid}.pid ]; then /bin/rm /var/run/suricata_{$if_real}{$suricata_uuid}.pid fi else pid=`/bin/pgrep -fn "suricata -i {$if_real} "` if [ ! -z \$pid ]; then /usr/bin/logger -p daemon.info -i -t SuricataStartup "Suricata STOP for {$value['descr']}({$suricata_uuid}_{$if_real})..." /bin/pkill -TERM -fn "suricata -i {$if_real} " time=0 timeout=30 while /bin/kill -TERM \$pid 2>/dev/null; do sleep 1 time=\$((time+1)) if [ \$time -gt \$timeout ]; then break fi done fi fi sleep 2 {$stop_barnyard2} EOE; } $rc_start = implode("\n", $start_suricata_iface_start); $rc_stop = implode("\n", $start_suricata_iface_stop); $suricata_sh_text = << 0) $suricatabarnyardlog_output_plugins .= " sensor_name={$suricatacfg['barnyard_sensor_name']}"; if ($suricatacfg['barnyard_disable_sig_ref_tbl'] == 'on') $suricatabarnyardlog_output_plugins .= " disable_signature_reference_table"; $suricatabarnyardlog_output_plugins .= "\n\n"; } if ($suricatacfg['barnyard_syslog_enable'] == 'on') { $suricatabarnyardlog_output_plugins .= "# syslog_full: log to a syslog receiver\n"; $suricatabarnyardlog_output_plugins .= "output alert_syslog_full: sensor_name {$suricatabarnyardlog_hostname_info_chk}, "; if ($suricatacfg['barnyard_syslog_local'] == 'on') $suricatabarnyardlog_output_plugins .= "local, log_facility LOG_AUTH, log_priority LOG_INFO\n\n"; else { $suricatabarnyardlog_output_plugins .= "server {$suricatacfg['barnyard_syslog_rhost']}, protocol {$suricatacfg['barnyard_syslog_proto']}, "; $suricatabarnyardlog_output_plugins .= "port {$suricatacfg['barnyard_syslog_dport']}, operation_mode {$suricatacfg['barnyard_syslog_opmode']}, "; $suricatabarnyardlog_output_plugins .= "log_facility {$suricatacfg['barnyard_syslog_facility']}, log_priority {$suricatacfg['barnyard_syslog_priority']}\n\n"; } } if ($suricatacfg['barnyard_bro_ids_enable'] == 'on') { $suricatabarnyardlog_output_plugins .= "# alert_bro: log to a Bro-IDS receiver\n"; $suricatabarnyardlog_output_plugins .= "output alert_bro: {$suricatacfg['barnyard_bro_ids_rhost']}:{$suricatacfg['barnyard_bro_ids_dport']}\n"; } // Trim leading and trailing newlines and spaces $suricatabarnyardlog_output_plugins = rtrim($suricatabarnyardlog_output_plugins, "\n"); // User pass-through arguments $suricatabarnyardlog_config_pass_thru = str_replace("\r", "", base64_decode($suricatacfg['barnconfigpassthru'])); // Create the conf file as a text string $barnyard2_conf_text = << Suricata instance info in */ /* the config.xml master config */ /* file. */ /************************************************************/ global $config, $g; $suricatadir = SURICATADIR; $suricatalogdir = SURICATALOGDIR; $flowbit_rules_file = FLOWBITS_FILENAME; $suricata_enforcing_rules_file = ENFORCING_RULES_FILENAME; $if_real = get_real_interface($suricatacfg['interface']); $suricata_uuid = $suricatacfg['uuid']; $suricatacfgdir = "{$suricatadir}suricata_{$suricata_uuid}_{$if_real}"; conf_mount_rw(); if (!is_array($config['installedpackages']['suricata']['rule'])) return; // Pull in the PHP code that generates the suricata.yaml file // variables that will be substitued further down below. include("/usr/local/www/suricata/suricata_generate_yaml.php"); // Pull in the boilerplate template for the suricata.yaml // configuration file. The contents of the template along // with substituted variables is stored in $suricata_conf_text // (which is defined in the included file). include("/usr/local/pkg/suricata/suricata_yaml_template.inc"); // Now write out the conf file using $suricata_conf_text contents @file_put_contents("{$suricatacfgdir}/suricata.yaml", $suricata_conf_text); unset($suricata_conf_text); conf_mount_ro(); } ?>