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| Current File : /home1/savoy/www/wp-content/plugins/wordfence/lib/wordfenceURLHoover.php |
<?php
require_once(dirname(__FILE__) . '/wfAPI.php');
require_once(dirname(__FILE__) . '/wfArray.php');
class wordfenceURLHoover {
private $debug = false;
public $errorMsg = false;
private $hostsToAdd = false;
private $table = '';
private $apiKey = false;
private $wordpressVersion = false;
private $useDB = true;
private $hostKeys = array();
private $hostList = array();
public $currentHooverID = false;
private $_foundSome = false;
private $_excludedHosts = array();
private $api = false;
private $db = false;
public static function standardExcludedHosts() {
static $standardExcludedHosts = null;
if ($standardExcludedHosts !== null) {
return $standardExcludedHosts;
}
global $wpdb;
$excludedHosts = array();
if (is_multisite()) {
$blogIDs = $wpdb->get_col("SELECT blog_id FROM {$wpdb->blogs}"); //Can't use wp_get_sites or get_sites because they return empty at 10k sites
foreach ($blogIDs as $id) {
$homeURL = get_home_url($id);
$host = parse_url($homeURL, PHP_URL_HOST);
if ($host) {
$excludedHosts[$host] = 1;
}
$siteURL = get_site_url($id);
$host = parse_url($siteURL, PHP_URL_HOST);
if ($host) {
$excludedHosts[$host] = 1;
}
}
}
else {
$homeURL = wfUtils::wpHomeURL();
$host = parse_url($homeURL, PHP_URL_HOST);
if ($host) {
$excludedHosts[$host] = 1;
}
$siteURL = wfUtils::wpSiteURL();
$host = parse_url($siteURL, PHP_URL_HOST);
if ($host) {
$excludedHosts[$host] = 1;
}
}
$standardExcludedHosts = array_keys($excludedHosts);
return $standardExcludedHosts;
}
public function __sleep() {
$this->writeHosts();
return array('debug', 'errorMsg', 'table', 'apiKey', 'wordpressVersion');
}
public function __wakeup() {
$this->hostsToAdd = new wfArray(array('owner', 'host', 'path', 'hostKey'));
$this->api = new wfAPI($this->apiKey, $this->wordpressVersion);
$this->db = new wfDB();
}
public function __construct($apiKey, $wordpressVersion, $db = false, $continuation = false) {
$this->hostsToAdd = new wfArray(array('owner', 'host', 'path', 'hostKey'));
$this->apiKey = $apiKey;
$this->wordpressVersion = $wordpressVersion;
$this->api = new wfAPI($apiKey, $wordpressVersion);
if($db){
$this->db = $db;
} else {
$this->db = new wfDB();
}
global $wpdb;
if(isset($wpdb)){
$this->table = wfDB::networkTable('wfHoover');
} else {
$this->table = 'wp_wfHoover';
}
if (!$continuation) {
$this->cleanup();
}
}
public function cleanup() {
$this->db->truncate($this->table);
}
public function hoover($id, $data, $excludedHosts = array()) {
$this->currentHooverID = $id;
$this->_foundSome = 0;
$this->_excludedHosts = $excludedHosts;
@preg_replace_callback('_((?:(?://)(?:\S+(?::\S*)?@)?(?:(?:(?:[a-z\xa1-\xff0-9.-]+)(?:\.(?:(?:xn--[a-z\xa1-\xff0-9-]+)|[a-z\xa1-\xff]{2,}))))(?::\d{2,5})?)(?:/[a-z0-9\-\_\.~\!\*\(\);\:@&\=\+\$,\?#\[\]%]*)*)_iS', array($this, 'captureURL'), $data);
$this->writeHosts();
return $this->_foundSome;
}
private function dbg($msg) {
if ($this->debug) { wordfence::status(4, 'info', $msg); }
}
public function captureURL($matches) {
$id = $this->currentHooverID;
$url = 'http:' . $matches[0];
if (!filter_var($url, FILTER_VALIDATE_URL)) {
return;
}
$components = parse_url($url);
if (preg_match('/\.(xn--(?:[a-z0-9-]*)[a-z0-9]+|[a-z\xa1-\xff0-9]{2,})$/i', $components['host'], $tld)) {
$tld = strtolower($tld[1]);
if (strpos(wfConfig::get('tldlist', ''), '|' . $tld . '|') === false) {
return;
}
}
else {
return;
}
foreach ($this->_excludedHosts as $h) {
if (strcasecmp($h, $components['host']) === 0) {
return;
}
}
$this->_foundSome++;
$host = (isset($components['host']) ? $components['host'] : '');
$path = (isset($components['path']) && !empty($components['path']) ? $components['path'] : '/');
$hashes = $this->_generateHashes($url);
foreach ($hashes as $h) {
$this->hostsToAdd->push(array('owner' => $id, 'host' => $host, 'path' => $path, 'hostKey' => wfUtils::substr($h, 0, 4)));
}
if($this->hostsToAdd->size() > 1000){ $this->writeHosts(); }
}
private function writeHosts() {
if ($this->hostsToAdd->size() < 1) { return; }
if ($this->useDB) {
$sql = "INSERT INTO " . $this->table . " (owner, host, path, hostKey) VALUES ";
while ($elem = $this->hostsToAdd->shift()) {
//This may be an issue for hyperDB or other abstraction layers, but leaving it for now.
$sql .= sprintf("('%s', '%s', '%s', '%s'),",
$this->db->realEscape($elem['owner']),
$this->db->realEscape($elem['host']),
$this->db->realEscape($elem['path']),
$this->db->realEscape($elem['hostKey'])
);
}
$sql = rtrim($sql, ',');
$this->db->queryWrite($sql);
$this->hostsToAdd->collectGarbage();
}
else {
while ($elem = $this->hostsToAdd->shift()) {
$keys = str_split($elem['hostKey'], 4);
foreach ($keys as $k) {
$this->hostKeys[] = $k;
}
$this->hostList[] = array(
'owner' => $elem['owner'],
'host' => $elem['host'],
'path' => $elem['path'],
'hostKey' => $elem['hostKey']
);
}
$this->hostsToAdd->collectGarbage();
}
}
public function getBaddies() {
wordfence::status(4, 'info', __("Gathering host keys.", 'wordfence'));
$allHostKeys = '';
if ($this->useDB) {
global $wpdb;
$dbh = $wpdb->dbh;
$useMySQLi = wfUtils::useMySQLi();
if ($useMySQLi) { //If direct-access MySQLi is available, we use it to minimize the memory footprint instead of letting it fetch everything into an array first
wordfence::status(4, 'info', __("Using MySQLi directly.", 'wordfence'));
$result = $dbh->query("SELECT DISTINCT hostKey FROM {$this->table} ORDER BY hostKey ASC LIMIT 100000"); /* We limit to 100,000 prefixes since more than that cannot be reliably checked within the default max_execution_time */
if (!is_object($result)) {
$this->errorMsg = "Unable to query database";
$this->dbg($this->errorMsg);
return false;
}
while ($row = $result->fetch_assoc()) {
$allHostKeys .= $row['hostKey'];
}
}
else {
$q1 = $this->db->querySelect("SELECT DISTINCT hostKey FROM {$this->table} ORDER BY hostKey ASC LIMIT 100000"); /* We limit to 100,000 prefixes since more than that cannot be reliably checked within the default max_execution_time */
foreach ($q1 as $hRec) {
$allHostKeys .= $hRec['hostKey'];
}
}
}
else {
$allHostKeys = implode('', array_values(array_unique($this->hostKeys)));
}
/**
* Check hash prefixes first. Each one is a 4-byte binary prefix of a SHA-256 hash of the URL. The response will
* be a binary list of 4-byte indices; The full URL for each index should be sent in the secondary query to
* find the true good/bad status.
*/
$allCount = wfUtils::strlen($allHostKeys) / 4;
if ($allCount > 0) {
if ($this->debug) {
$this->dbg("Checking {$allCount} hostkeys");
for ($i = 0; $i < $allCount; $i++) {
$key = wfUtils::substr($allHostKeys, $i * 4, 4);
$this->dbg("Checking hostkey: " . bin2hex($key));
}
}
wordfence::status(2, 'info', sprintf(/* translators: Number of domains. */ __("Checking %d host keys against Wordfence scanning servers.", 'wordfence'), $allCount));
$resp = $this->api->binCall('check_host_keys', $allHostKeys);
wordfence::status(2, 'info', __("Done host key check.", 'wordfence'));
$this->dbg("Done host key check");
$badHostKeys = '';
if ($resp['code'] >= 200 && $resp['code'] <= 299) {
$this->dbg("Host key response: " . bin2hex($resp['data']));
$dataLen = wfUtils::strlen($resp['data']);
if ($dataLen > 0 && $dataLen % 2 == 0) {
$this->dbg("Checking response indexes");
for ($i = 0; $i < $dataLen; $i += 2) {
$idx = wfUtils::array_first(unpack('n', wfUtils::substr($resp['data'], $i, 2)));
$this->dbg("Checking index {$idx}");
if ($idx < $allCount) {
$prefix = wfUtils::substr($allHostKeys, $idx * 4, 4);
$badHostKeys .= $prefix;
$this->dbg("Got bad hostkey for record: " . bin2hex($prefix));
}
else {
$this->dbg("Bad allHostKeys index: {$idx}");
$this->errorMsg = "Bad allHostKeys index: {$idx}";
return false;
}
}
}
else if ($dataLen > 0) {
$this->errorMsg = "Invalid data length received from Wordfence server: " . $dataLen;
$this->dbg($this->errorMsg);
return false;
}
}
else {
$this->errorMsg = "Wordfence server responded with an error. HTTP code " . $resp['code'] . " and data: " . $resp['data'];
return false;
}
$badCount = wfUtils::strlen($badHostKeys) / 4;
if ($badCount > 0) {
$urlsToCheck = array();
$totalURLs = 0;
//Reconcile flagged prefixes with their corresponding URLs
for ($i = 0; $i < $badCount; $i++) {
$prefix = wfUtils::substr($badHostKeys, $i * 4, 4);
if ($this->useDB) {
/**
* Putting a 10000 limit in here for sites that have a huge number of items with the same URL
* that repeats. This is an edge case. But if the URLs are malicious then presumably the admin
* will fix the malicious URLs and on subsequent scans the items (owners) that are above the
* 10000 limit will appear.
*/
$q1 = $this->db->querySelect("SELECT DISTINCT owner, host, path FROM {$this->table} WHERE hostKey = %s LIMIT 10000", $prefix);
foreach ($q1 as $rec) {
$url = 'http://' . $rec['host'] . $rec['path'];
if (!isset($urlsToCheck[$rec['owner']])) {
$urlsToCheck[$rec['owner']] = array();
}
if (!in_array($url, $urlsToCheck[$rec['owner']])) {
$urlsToCheck[$rec['owner']][] = $url;
$totalURLs++;
}
}
}
else {
foreach ($this->hostList as $rec) {
$pos = wfUtils::strpos($rec['hostKey'], $prefix);
if ($pos !== false && $pos % 4 == 0) {
$url = 'http://' . $rec['host'] . $rec['path'];
if (!isset($urlsToCheck[$rec['owner']])) {
$urlsToCheck[$rec['owner']] = array();
}
if (!in_array($url, $urlsToCheck[$rec['owner']])) {
$urlsToCheck[$rec['owner']][] = $url;
$totalURLs++;
}
}
}
}
if ($totalURLs > 10000) { break; }
}
if (count($urlsToCheck) > 0) {
wordfence::status(2, 'info', sprintf(
/* translators: 1. Number of URLs. 2. Number of files. */
__('Checking %1$d URLs from %2$d sources.', 'wordfence'),
$totalURLs,
sizeof($urlsToCheck)
));
$badURLs = $this->api->call('check_bad_urls', array(), array('toCheck' => json_encode($urlsToCheck)));
wordfence::status(2, 'info', __("Done URL check.", 'wordfence'));
$this->dbg("Done URL check");
if (is_array($badURLs) && count($badURLs) > 0) {
$finalResults = array();
foreach ($badURLs as $file => $badSiteList) {
if (!isset($finalResults[$file])) {
$finalResults[$file] = array();
}
foreach ($badSiteList as $badSite) {
$finalResults[$file][] = array(
'URL' => $badSite[0],
'badList' => $badSite[1]
);
}
}
$this->dbg("Confirmed " . count($badURLs) . " bad URLs");
return $finalResults;
}
}
}
}
return array();
}
protected function _generateHashes($url) {
//The GSB specification requires generating and sending hash prefixes for a number of additional similar URLs. See: https://developers.google.com/safe-browsing/v4/urls-hashing#suffixprefix-expressions
$canonicalURL = $this->_canonicalizeURL($url);
//Extract the scheme
$scheme = 'http';
if (preg_match('~^([a-z]+[a-z0-9+\.\-]*)://(.*)$~i', $canonicalURL, $matches)) {
$scheme = strtolower($matches[1]);
$canonicalURL = $matches[2];
}
//Separate URL and query string
$query = '';
if (preg_match('/^([^?]+)(\??.*)/', $canonicalURL, $matches)) {
$canonicalURL = $matches[1];
$query = $matches[2];
}
//Separate host and path
$path = '';
preg_match('~^(.*?)(?:(/.*)|$)~', $canonicalURL, $matches);
$host = $matches[1];
if (isset($matches[2])) {
$path = $matches[2];
}
//Clean host
$host = $this->_normalizeHost($host);
//Generate hosts list
$hosts = array();
if (filter_var(trim($host, '[]'), FILTER_VALIDATE_IP)) {
$hosts[] = $host;
}
else {
$hostComponents = explode('.', $host);
$numComponents = count($hostComponents) - 7;
if ($numComponents < 1) {
$numComponents = 1;
}
$hosts[] = $host;
for ($i = $numComponents; $i < count($hostComponents) - 1; $i++) {
$hosts[] = implode('.', array_slice($hostComponents, $i));
}
}
//Generate paths list
$paths = array('/');
$pathComponents = array_filter(explode('/', $path));
$numComponents = min(count($pathComponents), 4);
for ($i = 1; $i < $numComponents; $i++) {
$paths[] = '/' . implode('/', array_slice($pathComponents, 0, $i)) . '/';
}
if ($path != '/') {
$paths[] = $path;
}
if (strlen($query) > 0) {
$paths[] = $path . '?' . $query;
}
$paths = array_reverse($paths); //So we start at the most specific and move to most generic
//Generate hashes
$hashes = array();
foreach ($hosts as $h) {
$hashes[$h] = hash('sha256', $h, true); //WFSB compatibility -- it uses hashes without the path
foreach ($paths as $p) {
$key = $h . $p;
$hashes[$key] = hash('sha256', $key, true);
break; //We no longer have any use for the extra path variants, so just include the primary one and exit the loop after
}
}
return $hashes;
}
protected function _canonicalizeURL($url) { //Based on https://developers.google.com/safe-browsing/v4/urls-hashing#canonicalization and Google's reference implementation https://github.com/google/safebrowsing/blob/master/urls.go
//Strip fragment
$url = $this->_array_first(explode('#', $url));
//Trim space
$url = trim($url);
//Remove tabs, CR, LF
$url = preg_replace('/[\t\n\r]/', '', $url);
//Normalize escapes
$url = $this->_normalizeEscape($url);
if ($url === false) { return false; }
//Extract the scheme
$scheme = 'http';
if (preg_match('~^([a-z]+[a-z0-9+\.\-]*)://(.*)$~i', $url, $matches)) {
$scheme = strtolower($matches[1]);
$url = $matches[2];
}
//Separate URL and query string
$query = '';
if (preg_match('/^([^?]+)(\??.*)/', $url, $matches)) {
$url = $matches[1];
$query = $matches[2];
}
$endsWithSlash = substr($url, -1) == '/';
//Separate host and path
$path = '';
preg_match('~^(.*?)(?:(/.*)|$)~', $url, $matches);
$host = $matches[1];
if (isset($matches[2])) {
$path = $matches[2];
}
//Clean host
$host = $this->_normalizeHost($host);
if ($host === false) { return false; }
//Clean path
$path = preg_replace('~//+~', '/', $path); //Multiple slashes -> single slash
$path = preg_replace('~(?:^|/)\.(?:$|/)~', '/', $path); //. path components removed
while (preg_match('~/(?!\.\./)[^/]+/\.\.(?:$|/)~', $path)) { //Resolve ..
$path = preg_replace('~/(?!\.\./)[^/]+/\.\.(?:$|/)~', '/', $path, 1);
}
$path = preg_replace('~(?:^|/)\.\.(?:$|/)~', '/', $path); //Eliminate .. at the beginning
$path = trim($path, '.');
$path = preg_replace('/\.\.+/', '.', $path);
if ($path == '.' || $path == '') {
$path = '/';
}
else if ($endsWithSlash && substr($path, -1) != '/') {
$path .= '/';
}
return $scheme . '://' . $host . $path . $query;
}
protected function _normalizeEscape($url) {
$maxDepth = 1024;
$i = 0;
while (preg_match('/%([0-9a-f]{2})/i', $url)) {
$url = preg_replace_callback('/%([0-9a-f]{2})/i', array($this, '_hex2binCallback'), $url);
$i++;
if ($i > $maxDepth) {
return false;
}
}
return preg_replace_callback('/[\x00-\x20\x7f-\xff#%]/', array($this, '_bin2hexCallback'), $url);
}
protected function _hex2binCallback($matches) {
return wfUtils::hex2bin($matches[1]);
}
protected function _bin2hexCallback($matches) {
return '%' . bin2hex($matches[0]);
}
protected function _normalizeHost($host) {
//Strip username:password
$host = $this->_array_last(explode('@', $host));
//IPv6 literal
if (substr($host, 0, 1) == '[') {
if (strpos($host, ']') === false) { //No closing bracket
return false;
}
}
//Strip port
$host = preg_replace('/:\d+$/', '', $host);
//Unicode to IDNA
$u = rawurldecode($host);
if (preg_match('/[\x81-\xff]/', $u)) { //0x80 is technically Unicode, but the GSB canonicalization doesn't consider it one
if (function_exists('idn_to_ascii')) { //Some PHP versions don't have this and we don't have a polyfill
$host = idn_to_ascii($u);
}
}
//Remove extra dots
$host = trim($host, '.');
$host = preg_replace('/\.\.+/', '.', $host);
//Canonicalize IP addresses
if ($iphost = $this->_parseIP($host)) {
return $iphost;
}
return strtolower($host);
}
protected function _parseIP($host) {
// The Windows resolver allows a 4-part dotted decimal IP address to have a
// space followed by any old rubbish, so long as the total length of the
// string doesn't get above 15 characters. So, "10.192.95.89 xy" is
// resolved to 10.192.95.89. If the string length is greater than 15
// characters, e.g. "10.192.95.89 xy.wildcard.example.com", it will be
// resolved through DNS.
if (strlen($host) <= 15) {
$host = $this->_array_first(explode(' ', $host));
}
if (!preg_match('/^((?:0x[0-9a-f]+|[0-9\.])+)$/i', $host)) {
return false;
}
$parts = explode('.', $host);
if (count($parts) > 4) {
return false;
}
$strings = array();
foreach ($parts as $i => $p) {
if ($i == count($parts) - 1) {
$strings[] = $this->_canonicalNum($p, 5 - count($parts));
}
else {
$strings[] = $this->_canonicalNum($p, 1);
}
if ($strings[$i] == '') {
return '';
}
}
return implode('.', $strings);
}
protected function _canonicalNum($part, $n) {
if ($n <= 0 || $n > 4) {
return '';
}
if (preg_match('/^0x(\d+)$/i', $part, $matches)) { //hex
$part = hexdec($matches[1]);
}
else if (preg_match('/^0(\d+)$/i', $part, $matches)) { //octal
$part = octdec($matches[1]);
}
else {
$part = (int) $part;
}
$strings = array_fill(0, $n, '');
for ($i = $n - 1; $i >= 0; $i--) {
$strings[$i] = (string) ($part & 0xff);
$part = $part >> 8;
}
return implode('.', $strings);
}
protected function _array_first($array) {
if (empty($array)) {
return null;
}
return $array[0];
}
protected function _array_last($array) {
if (empty($array)) {
return null;
}
return $array[count($array) - 1];
}
}