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snort.inc
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snort.inc
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<?php
/*
* snort.inc
*
* part of pfSense (https://www.pfsense.org)
* Copyright (c) 2006-2024 Rubicon Communications, LLC (Netgate)
* Copyright (c) 2009-2010 Robert Zelaya
* Copyright (c) 2013-2024 Bill Meeks
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
require_once("pfsense-utils.inc");
require_once("config.inc");
require_once("functions.inc");
require_once("service-utils.inc"); // Need this to get RCFILEPREFIX definition
require_once("pkg-utils.inc");
require_once("filter.inc");
require_once("xmlrpc_client.inc");
require("/usr/local/pkg/snort/snort_defs.inc");
// Snort GUI needs at least 512 MB to manipulate large rules arrays
ini_set("memory_limit", config_get_path('system/php_memory_limit', '512') . "M");
// Explicitly declare this as global so it works through function call includes
global $g, $rebuild_rules;
/* Rebuild Rules Flag -- if "true", rebuild enforcing rules and flowbit-rules files */
$rebuild_rules = false;
function snort_is_single_addr_alias($alias) {
/***************************************************/
/* This function evaluates the passed Alias to */
/* determine if it represents a single IP address, */
/* or a network in CIDR form, and returns TRUE if */
/* the condition is met, and FALSE if not. */
/* */
/* On Entry: $alias ==> Alias to be evaluated */
/* Returns: TRUE if Alias represents a single */
/* IP address or network, and FALSE */
/* if not. */
/***************************************************/
/* If spaces in expanded Alias, it's not a single entity */
if (strpos(trim(filter_expand_alias($alias)), " ") !== false)
return false;
else
return true;
}
function snort_expand_port_range($ports, $delim = ',') {
/**************************************************/
/* This function examines the passed ports string */
/* and expands any embedded port ranges into the */
/* individual ports separated by the specified */
/* delimiter. A port range is indicated by a */
/* colon in the string. */
/* */
/* On Entry: $ports ==> string to be evaluated */
/* with {$delim} separating */
/* the port values. */
/* Returns: string with any encountered port */
/* ranges expanded and the values */
/* delimited by {$delim}. */
/**************************************************/
$value = "";
// Split the incoming string on the specified delimiter
$tmp = explode($delim, $ports);
// Look for any included port range and expand it
foreach ($tmp as $val) {
if (is_portrange($val)) {
$start = strtok($val, ":");
$end = strtok(":");
if ($end !== false) {
$val = $start . $delim;
for ($i = intval($start) + 1; $i < intval($end); $i++)
$val .= strval($i) . $delim;
$val .= $end;
}
}
$value .= $val . $delim;
}
// Remove any trailing delimiter in return value
return trim($value, $delim);
}
function snort_get_blocked_ips() {
$blocked_ips = array();
exec('/sbin/pfctl -t snort2c -T show', $blocked_ips);
$blocked_ips_array = array();
if (!empty($blocked_ips)) {
$blocked_ips_array = array();
if (is_array($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;
}
function snort_generate_id() {
while (true) {
$snort_uuid = mt_rand(1, 65535);
foreach (config_get_path('installedpackages/snortglobal/rule', []) as $value) {
if ($value['uuid'] == $snort_uuid)
continue 2;
}
break;
}
return $snort_uuid;
}
function snort_load_suppress_sigs($snortcfg, $track_by=false) {
/**********************************************************/
/* This function loads the GEN_ID and SIG_ID for all the */
/* suppressed alert entries from the Suppression List of */
/* the passed Snort 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();
foreach (config_get_path('installedpackages/snortglobal/suppress/item', []) as $a_id => $alist) {
if ($alist['name'] == $snortcfg['suppresslistname']) {
if (!empty($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;
}
}
return $suppress;
}
/* func finds custom lists by name and type (defaults to 'whitelist') */
function snort_find_list($find_name, $type = 'whitelist') {
foreach (config_get_path("installedpackages/snortglobal/{$type}/item", []) as $value) {
if ($value['name'] == $find_name)
return $value;
}
return array();
}
/* func builds custom whitelists and the HOME_NET variable */
function snort_build_list($snortcfg, $listname = "", $whitelist = false, $externallist = false) {
/***********************************************************/
/* The default is to build a HOME_NET variable unless */
/* '$whitelist' or '$externallist is set to TRUE when */
/* calling. */
/* */
/* When '$whitelist' is TRUE, a Pass List is built. */
/* When '$externalist' is TRUE, the EXTERNAL_NET variable */
/* is built. */
/***********************************************************/
global $g, $aliastable, $filterdns;
$home_net = array();
// If passed an empty interface config array, then
// exit returning an empty list array. This is an
// unexpected condition.
if (empty($snortcfg))
return $home_net;
if (!$externallist && ($listname == 'default' || empty($listname))) {
$localnet = 'yes'; $wanip = 'yes'; $wangw = 'yes'; $wandns = 'yes'; $vips = 'yes'; $vpns = 'yes';
}
else {
$list = snort_find_list($listname);
if (empty($list))
return $list;
$localnet = $list['localnets'];
$wanip = 'yes';
$wangw = $list['wangateips'];
$wandns = $list['wandnsips'];
$vips = $list['vips'];
$vpns = $list['vpnips'];
// Process any custom IPs or aliases defined for the list.
// We allow dynamically updated aliases only for a Pass
// List. So for Pass Lists, we test for null strings from
// filter_expand_alias() and assume the passed alias is a
// FQDN or other dynamically updated alias.
if (array_get_path($list, 'address/item')) {
foreach ($list['address']['item'] as $addr) {
if (!$whitelist) {
if (is_alias($addr) && (alias_get_type($addr) == "host" || alias_get_type($addr) == "network")) {
$home_net = array_merge($home_net, explode(" ", trim(filter_expand_alias($addr))));
} elseif (is_ipaddr($addr) || is_subnet($addr)) {
$home_net[] = $addr;
}
} elseif ($whitelist) {
if (is_alias($addr) && (alias_get_type($addr) == "host" || alias_get_type($addr) == "network")) {
$tmp = trim(filter_expand_alias($addr));
if ($tmp <> "") {
$home_net = array_merge($home_net, explode(" ", $tmp));
} else {
$home_net[] = $addr;
}
} elseif (is_ipaddr($addr) || is_subnet($addr)) {
$home_net[] = $addr;
}
}
}
}
}
/* Always add loopback addresses to HOME_NET and whitelist */
if (!$externallist) {
if (!in_array("127.0.0.1", $home_net))
$home_net[] = "127.0.0.1";
if (!in_array("::1", $home_net))
$home_net[] = "::1";
}
/********************************************************************/
/* Always put the interface running Snort 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 */
/* WHITELIST, then do not include the Snort interface subnet in the */
/* WHITELIST. We do include the actual LAN interface IP for Snort, */
/* though, to prevent locking out the firewall itself. */
/********************************************************************/
$snortip = get_interface_ip($snortcfg['interface']);
if (($externallist && $localnet == 'yes') || (!$externallist && $whitelist && ($localnet == 'yes' || empty($localnet)))) {
if (is_ipaddr($snortip)) {
if ($snortcfg['interface'] <> "wan") {
if ($sn = get_interface_subnet($snortcfg['interface'])) {
$ip = gen_subnet($snortip, $sn) . "/{$sn}";
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
}
}
}
elseif (!$externallist && $localnet != 'yes') {
if (is_ipaddrv4($snortip)) {
if (!in_array($snortip, $home_net))
$home_net[] = $snortip;
}
}
// Grab the IPv6 address if we have one assigned
$snortip = get_interface_ipv6($snortcfg['interface']);
// Trim off the interface designation (e.g., %em1) if present
if (strpos($snortip, "%") !== FALSE)
$snortip = substr($snortip, 0, strpos($snortip, "%"));
if (($externallist && $localnet == 'yes') || ($whitelist && ($localnet == 'yes' || empty($localnet))) || (!$externallist && !$whitelist && ($localnet == 'yes' || empty($localnet)))) {
if (is_ipaddrv6($snortip)) {
if ($snortcfg['interface'] <> "wan") {
if ($sn = get_interface_subnetv6($snortcfg['interface'])) {
$ip = gen_subnetv6($snortip, $sn). "/{$sn}";
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
}
}
}
elseif (!$externallist && $localnet != 'yes') {
if (is_ipaddrv6($snortip)) {
if (!in_array($snortip, $home_net))
$home_net[] = $snortip;
}
}
// Add link-local address if user included locally-attached networks
$snortip = get_interface_linklocal($snortcfg['interface']);
if (!empty($snortip) && $localnet == 'yes') {
// Trim off the interface designation (e.g., %em1) if present
if (strpos($snortip, "%") !== FALSE)
$snortip = substr($snortip, 0, strpos($snortip, "%"));
if (!in_array($snortip, $home_net))
$home_net[] = $snortip;
}
if (($externallist && $localnet == 'yes') || ($whitelist && ($localnet == 'yes' || empty($localnet))) || (!$externallist && !$whitelist && ($localnet == 'yes' || empty($localnet)))) {
/*************************************************************************/
/* Iterate through the interface list and write out whitelist items and */
/* also compile a HOME_NET list of all the local interfaces for snort. */
/* 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_ipaddrv4($subnet)) {
if ($sn = get_interface_subnet($int)) {
$ip = gen_subnet($subnet, $sn) . "/{$sn}";
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
}
$subnet = get_interface_ipv6($int);
// Trim off the interface designation (e.g., %em1) if present
if (strpos($subnet, "%") !== FALSE)
$subnet = substr($subnet, 0, strpos($subnet, "%"));
if (is_ipaddrv6($subnet)) {
if ($sn = get_interface_subnetv6($int)) {
$ip = gen_subnetv6($subnet, $sn). "/{$sn}";
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
}
// Add link-local address
$snortip = get_interface_linklocal($int);
if (!empty($snortip)) {
// Trim off the interface designation (e.g., %em1) if present
if (strpos($snortip, "%") !== FALSE)
$snortip = substr($snortip, 0, strpos($snortip, "%"));
if (!in_array($snortip, $home_net))
$home_net[] = $snortip;
}
}
}
if ($wanip == 'yes') {
$ip = get_interface_ip("wan");
if (is_ipaddrv4($ip)) {
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
$ip = get_interface_ipv6("wan");
// Trim off the interface designation (e.g., %em1) if present
if (strpos($ip, "%") !== FALSE)
$ip = substr($ip, 0, strpos($ip, "%"));
if (is_ipaddrv6($ip)) {
if (!in_array($ip, $home_net))
$home_net[] = $ip;
}
// Explicitly grab the WAN Link-Local address
$snortip = get_interface_linklocal("wan");
if (!empty($snortip)) {
// Trim off the interface designation (e.g., %em1) if present
if (strpos($snortip, "%") !== FALSE)
$snortip = substr($snortip, 0, strpos($snortip, "%"));
if (!in_array($snortip, $home_net))
$home_net[] = $snortip;
}
}
if ($wangw == 'yes') {
/* Grab the default gateway if set */
$default_gw = exec("/sbin/route -n get default |grep 'gateway:' | /usr/bin/awk '{ print $2 }'");
if (is_ipaddrv4($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 */
$gw = get_interface_gateway($snortcfg['interface']);
if (is_ipaddrv4($gw) && !in_array($gw, $home_net))
$home_net[] = $gw;
$gw = get_interface_gateway_v6($snortcfg['interface']);
// Trim off the interface designation (e.g., %em1) if present
if (strpos($gw, "%") !== FALSE)
$gw = substr($gw, 0, strpos($gw, "%"));
if (is_ipaddrv6($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 whitelist */
foreach(config_get_path('virtualip/vip', []) as $vip) {
if ($vip['subnet']) {
if (!in_array("{$vip['subnet']}/{$vip['subnet_bits']}", $home_net))
$home_net[] = "{$vip['subnet']}/{$vip['subnet_bits']}";
}
}
}
// Grab a list of vpns enabled - these come back as CIDR mask networks
if ($vpns == 'yes') {
$vpns_list = snort_get_vpns_list();
if (!empty($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);
}
}
// Validate the HOME_NET entries
$valresult = array();
foreach ($home_net as $vald) {
if (empty($vald) || (!is_subnet($vald) && !is_ipaddr($vald) && !is_alias($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 $valresult;
}
/* Checks to see if service is running by looking for PID filename matching the UUID */
function snort_is_running($uuid) {
global $g;
return isvalidpid("{$g['varrun_path']}/snort_{$uuid}.pid");
}
function snort_stop($snortcfg, $if_real) {
global $g;
$snort_uuid = $snortcfg['uuid'];
if (isvalidpid("{$g['varrun_path']}/snort_{$snort_uuid}.pid")) {
syslog(LOG_NOTICE, "[Snort] Snort STOP for " . convert_real_interface_to_friendly_descr($if_real) . "({$if_real})...");
killbypid("{$g['varrun_path']}/snort_{$snort_uuid}.pid");
// Now wait up to 10 seconds for Snort to actually stop and clear its PID file
$count = 0;
do {
if (!isvalidpid("{$g['varrun_path']}/snort_{$snort_uuid}.pid"))
break;
sleep(1);
$count++;
} while ($count < 10);
}
unlink_if_exists("{$g['varrun_path']}/snort_{$snort_uuid}.pid");
}
function snort_start($snortcfg, $if_real, $background=FALSE) {
global $g;
$snortdir = SNORTDIR;
$snortlogdir = SNORTLOGDIR;
$snort_uuid = $snortcfg['uuid'];
$snortbindir = SNORT_BINDIR;
if (config_get_path('installedpackages/snortglobal/verbose_logging') == "on")
$quiet = "";
else
$quiet = "-q --suppress-config-log";
// If Snort is already running on this interface, stop it before restarting
if (snort_is_running($snort_uuid)) {
snort_stop($snortcfg, $if_real);
}
if ($snortcfg['enable'] == 'on' && $if_real <> "" && !isvalidpid("{$g['varrun_path']}/snort_{$snort_uuid}.pid")) {
// Adjust the interface specification and DAQ type according to operating mode
if ($snortcfg['ips_mode'] == "ips_mode_inline" && $snortcfg['blockoffenders7'] == "on") {
$iface = $if_real . "^:" . $if_real;
$daq_type = "-Q --daq netmap";
}
else {
$iface = $if_real;
$daq_type = "--daq pcap --daq-mode passive --treat-drop-as-alert";
}
syslog(LOG_NOTICE, "[Snort] Snort START for " . convert_real_interface_to_friendly_descr($if_real) . "({$if_real})...");
if ($background)
mwexec_bg("{$snortbindir}snort -R _{$snort_uuid} -M -D {$quiet} {$daq_type} -l {$snortlogdir}/snort_{$if_real}{$snort_uuid} --pid-path {$g['varrun_path']} --nolock-pidfile --no-interface-pidfile -G {$snort_uuid} -c {$snortdir}/snort_{$snort_uuid}_{$if_real}/snort.conf -i {$iface}");
else
mwexec("{$snortbindir}snort -R _{$snort_uuid} -M -D {$quiet} {$daq_type} -l {$snortlogdir}/snort_{$if_real}{$snort_uuid} --pid-path {$g['varrun_path']} --nolock-pidfile --no-interface-pidfile -G {$snort_uuid} -c {$snortdir}/snort_{$snort_uuid}_{$if_real}/snort.conf -i {$iface}");
}
}
function snort_start_all_interfaces($background=FALSE) {
/*************************************************************/
/* This function starts all configured and enabled Snort */
/* interfaces. */
/*************************************************************/
foreach (config_get_path('installedpackages/snortglobal/rule', []) as $snortcfg) {
if ($snortcfg['enable'] != 'on' || get_real_interface($snortcfg['interface']) == "")
continue;
snort_start($snortcfg, get_real_interface($snortcfg['interface']), $background);
}
}
function snort_stop_all_interfaces() {
/*************************************************************/
/* This function stops all configured Snort interfaces. */
/*************************************************************/
foreach (config_get_path('installedpackages/snortglobal/rule', []) as $snortcfg) {
snort_stop($snortcfg, get_real_interface($snortcfg['interface']));
}
}
function snort_restart_all_interfaces() {
/*************************************************************/
/* This function stops all configured Snort interfaces and */
/* restarts enabled Snort interfaces. */
/*************************************************************/
snort_stop_all_interfaces();
sleep(2);
snort_start_all_interfaces(TRUE);
}
function snort_reload_config($snortcfg, $signal="SIGHUP") {
/*************************************************************/
/* This function sends the passed SIGNAL to the Snort */
/* instance on the passed interface to cause Snort to */
/* reload and parse the running configuration without */
/* stopping packet processing. It also executes the */
/* the reload as a background process and returns control */
/* immediately to the caller. */
/* */
/* $signal = SIGHUP (default) parses and reloads config. */
/* SIGURG updates Host Attribute Table. */
/*************************************************************/
global $g;
$snortdir = SNORTDIR;
$snort_uuid = $snortcfg['uuid'];
$if_real = get_real_interface($snortcfg['interface']);
/******************************************************/
/* Only send the SIGHUP if Snort is running and we */
/* can find a valid PID for the process. */
/******************************************************/
if (isvalidpid("{$g['varrun_path']}/snort_{$snort_uuid}.pid")) {
syslog(LOG_NOTICE, "[Snort] Snort RELOAD CONFIG for " . convert_real_interface_to_friendly_descr($if_real) . "({$if_real})...");
mwexec_bg("/bin/pkill -{$signal} -F {$g['varrun_path']}/snort_{$snort_uuid}.pid");
}
}
/*
this code block is for deleting logs while keeping the newest file,
snort is linked to these files while running, do not take the easy way out
by touch and rm, snort will lose sync and not log.
*/
function snort_post_delete_logs($snort_uuid = 0) {
global $g;
foreach (config_get_path('installedpackages/snortglobal/rule', []) as $value) {
if ($value['uuid'] != $snort_uuid)
continue;
$if_real = get_real_interface($value['interface']);
$snort_log_dir = SNORTLOGDIR . "/snort_{$if_real}{$snort_uuid}";
if ($if_real != '') {
/* Clean-up rotated unified2 log files if any exist */
$filelist = glob("{$snort_log_dir}/*{$snort_uuid}_{$if_real}.u2.*");
/* Skip the most recently rotated log */
unset($filelist[count($filelist) - 1]);
foreach ($filelist as $file)
@unlink($file);
/* Clean-up packet capture files if any exist */
unlink_if_exists("{$snort_log_dir}/snort.log.*");
/* Clean-up stats file if enabled */
if ($value['perform_stat'] == 'on')
@file_put_contents("{$snort_log_dir}/{$if_real}.stats", "");
}
}
}
/* This returns size of passed directory or file in 1024-byte blocks */
function snort_Getdirsize($node) {
if(!is_readable($node))
return false;
$blah = exec( "/usr/bin/du -kdc $node" );
return substr( $blah, 0, strpos($blah, chr(9)) );
}
function snort_cron_job_exists($crontask, $match_time=FALSE, $minute="0", $hour="*", $monthday="*", $month="*", $weekday="*", $who="root") {
/************************************************************
* This function iterates the cron[] array in the config *
* to determine if the passed $crontask entry exists. It *
* returns TRUE if the $crontask already exists, or FALSE *
* if there is no match. *
* *
* The $match_time flag, when set, causes a test of the *
* configured task execution times along with the task *
* when checking for a match. *
* *
* We use this to prevent unneccessary config writes if *
* the $crontask already exists. *
************************************************************/
global $g;
foreach(config_get_path('cron/item', []) as $item) {
if(strpos($item['command'], $crontask) !== FALSE) {
if ($match_time) {
if ($item['minute'] != $minute)
return FALSE;
if ($item['hour'] != $hour)
return FALSE;
if ($item['mday'] != $monthday)
return FALSE;
if ($item['month'] != $month)
return FALSE;
if ($item['wday'] != $weekday)
return FALSE;
if ($item['who'] != $who)
return FALSE;
}
return TRUE;
}
}
return FALSE;
}
function snort_snortloglimit_install_cron($should_install=TRUE) {
// See if simply removing existing "loglimit" job for Snort
if ($should_install == FALSE) {
if (snort_cron_job_exists("snort/snort_check_cron_misc.inc", FALSE))
install_cron_job("snort_check_cron_misc.inc", false);
return;
}
// If there are no changes in the cron job command string from the existing job, then exit.
if ($should_install && snort_cron_job_exists("/usr/local/pkg/snort/snort_check_cron_misc.inc", TRUE, "*/5"))
return;
// Else install the new or updated cron job by removing the
// existing job first, then installing the new or updated job.
install_cron_job("snort_check_cron_misc.inc", false);
install_cron_job("/usr/bin/nice -n20 /usr/local/bin/php -f /usr/local/pkg/snort/snort_check_cron_misc.inc", $should_install, "*/5");
}
function snort_rm_blocked_install_cron($should_install) {
global $g;
// See if simply removing existing "expiretable" job for Snort
if ($should_install == FALSE) {
if (snort_cron_job_exists("snort2c", FALSE))
install_cron_job("snort2c", false);
return;
}
// Grab the configured interval from our configuration
$snort_rm_blocked_info_ck = config_get_path('installedpackages/snortglobal/rm_blocked');
if ($snort_rm_blocked_info_ck == "15m_b") {
$snort_rm_blocked_min = "*/2";
$snort_rm_blocked_hr = "*";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "900";
}
if ($snort_rm_blocked_info_ck == "30m_b") {
$snort_rm_blocked_min = "*/5";
$snort_rm_blocked_hr = "*";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "1800";
}
if ($snort_rm_blocked_info_ck == "1h_b") {
$snort_rm_blocked_min = "*/5";
$snort_rm_blocked_hr = "*";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "3600";
}
if ($snort_rm_blocked_info_ck == "3h_b") {
$snort_rm_blocked_min = "*/15";
$snort_rm_blocked_hr = "*";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "10800";
}
if ($snort_rm_blocked_info_ck == "6h_b") {
$snort_rm_blocked_min = "*/30";
$snort_rm_blocked_hr = "*";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "21600";
}
if ($snort_rm_blocked_info_ck == "12h_b") {
$snort_rm_blocked_min = "2";
$snort_rm_blocked_hr = "*/1";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "43200";
}
if ($snort_rm_blocked_info_ck == "1d_b") {
$snort_rm_blocked_min = "2";
$snort_rm_blocked_hr = "*/2";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "86400";
}
if ($snort_rm_blocked_info_ck == "4d_b") {
$snort_rm_blocked_min = "2";
$snort_rm_blocked_hr = "*/8";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "345600";
}
if ($snort_rm_blocked_info_ck == "7d_b") {
$snort_rm_blocked_min = "2";
$snort_rm_blocked_hr = "*/14";
$snort_rm_blocked_mday = "*";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "604800";
}
if ($snort_rm_blocked_info_ck == "28d_b") {
$snort_rm_blocked_min = "2";
$snort_rm_blocked_hr = "0";
$snort_rm_blocked_mday = "*/2";
$snort_rm_blocked_month = "*";
$snort_rm_blocked_wday = "*";
$snort_rm_blocked_expire = "2419200";
}
// Construct the basic cron command task
$command = "/usr/bin/nice -n20 /sbin/pfctl -q -t snort2c -T expire {$snort_rm_blocked_expire}";
// If there are no changes in the cron job command string from the existing job, then exit.
if (snort_cron_job_exists($command, TRUE, $snort_rm_blocked_min, $snort_rm_blocked_hr, $snort_rm_blocked_mday, $snort_rm_blocked_month, $snort_rm_blocked_wday, "root"))
return;
// Else install the new or updated cron job
if ($should_install) {
// Remove the existing job first, then install the new or updated job
install_cron_job("snort2c", false);
install_cron_job($command, true, $snort_rm_blocked_min, $snort_rm_blocked_hr, $snort_rm_blocked_mday, $snort_rm_blocked_month, $snort_rm_blocked_wday, "root");
}
}
/* func to install snort update */
function snort_rules_up_install_cron($should_install) {
global $g;
// If called with FALSE as argument, then we're removing
// the existing job.
if ($should_install == FALSE) {
if (snort_cron_job_exists("snort_check_for_rule_updates.php", FALSE))
install_cron_job("snort_check_for_rule_updates.php", false);
return;
}
// Grab the configured update interval from our configuration
$snort_rules_up_info_ck = config_get_path('installedpackages/snortglobal/autorulesupdate7');
/* See if a customized start time has been set for rule file updates */
if (!empty(config_get_path('installedpackages/snortglobal/rule_update_starttime')))
$snort_rules_upd_time = config_get_path('installedpackages/snortglobal/rule_update_starttime');
else
$snort_rules_upd_time = "00:" . str_pad(strval(random_int(0,59)), 2, "00", STR_PAD_LEFT);
if ($snort_rules_up_info_ck == "6h_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$hour = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_hr = strval($hour);
for ($i=0; $i<3; $i++) {
$hour += 6;
if ($hour > 23)
$hour -= 24;
$snort_rules_up_hr .= "," . strval($hour);
}
$snort_rules_up_mday = "*";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
if ($snort_rules_up_info_ck == "12h_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$hour = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_hr = strval($hour) . ",";
$hour += 12;
if ($hour > 23)
$hour -= 24;
$snort_rules_up_hr .= strval($hour);
$snort_rules_up_mday = "*";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
if ($snort_rules_up_info_ck == "1d_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$snort_rules_up_hr = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_mday = "*/1";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
if ($snort_rules_up_info_ck == "4d_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$snort_rules_up_hr = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_mday = "*/4";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
if ($snort_rules_up_info_ck == "7d_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$snort_rules_up_hr = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_mday = "*/7";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
if ($snort_rules_up_info_ck == "28d_up") {
$snort_rules_up_min = intval(substr($snort_rules_upd_time, -2));
$snort_rules_up_hr = intval(substr($snort_rules_upd_time, 0, 2));
$snort_rules_up_mday = "*/28";
$snort_rules_up_month = "*";
$snort_rules_up_wday = "*";
}
// Construct the basic cron command task
$command = "/usr/bin/nice -n20 /usr/local/bin/php -f /usr/local/pkg/snort/snort_check_for_rule_updates.php";
// If there are no changes in the cron job command string from the existing job, then exit
if (snort_cron_job_exists($command, TRUE, $snort_rules_up_min, $snort_rules_up_hr, $snort_rules_up_mday, $snort_rules_up_month, $snort_rules_up_wday, "root"))
return;
// Else install the new or updated cron job
if ($should_install) {
// Remove the existing job first, then install the new or updated job
install_cron_job("snort_check_for_rule_updates.php", false);
install_cron_job($command, $should_install, $snort_rules_up_min, $snort_rules_up_hr, $snort_rules_up_mday, $snort_rules_up_month, $snort_rules_up_wday, "root");
}
}
/* Only run when all ifaces needed to sync */
function sync_snort_package_config() {
global $g;
global $rebuild_rules;
$snortdir = SNORTDIR;
$rcdir = RCFILEPREFIX;
/* Create required log and db directories in /var on each sync, in case /var is in RAM. */
safe_mkdir(SNORTLOGDIR);
safe_mkdir(SNORT_IPREP_PATH);
safe_mkdir(SNORT_SID_MODS_PATH);
safe_mkdir(SNORT_APPID_ODP_PATH);
/* Iterate configured interfaces and generate a snort.conf for each */
foreach (config_get_path('installedpackages/snortglobal/rule', []) as $value) {
/* Skip configuration of any disabled instance or */
/* an instance whose assigned physical interface */
/* has been removed. */
if (($value['enable'] != 'on') || (get_real_interface($value['interface']) == ""))
continue;
/* create a snort.conf file for interface */
snort_generate_conf($value);
}
/* create snort bootup file snort.sh */
snort_create_rc();
snort_snortloglimit_install_cron(true);
/* set the snort block hosts time IMPORTANT */
snort_rm_blocked_install_cron(config_get_path('installedpackages/snortglobal/rm_blocked') != "never_b" ? true : false);
/* set the snort rules update time */
snort_rules_up_install_cron(config_get_path('installedpackages/snortglobal/autorulesupdate7') != "never_up" ? true : false);
/* Do not attempt package sync if reinstalling package or booting */
if (!$g['snort_postinstall'] && !$g['booting'])
snort_sync_on_changes();
}
function snort_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 Snort. */
/* */
/* 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 */