333 lines
8.9 KiB
PHP
333 lines
8.9 KiB
PHP
<?php
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/**
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* Statify Blacklist: StatifyBlacklist class
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*
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* This file contains the plugin's base class.
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*
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* @package Statify_Blacklist
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* @since 1.0.0
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*/
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// Quit.
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defined( 'ABSPATH' ) OR exit;
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/**
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* Statify Blacklist.
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*
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* @since 1.0.0
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*/
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class StatifyBlacklist {
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/**
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* Plugin major version.
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*
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* @since 1.4.0
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* @var int VERSION_MAIN
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*/
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const VERSION_MAIN = 1.4;
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/**
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* Plugin options.
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*
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* @since 1.0.0
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* @var array $_options
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*/
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public static $_options;
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/**
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* Multisite Status.
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*
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* @since 1.0.0
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* @var bool $multisite
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*/
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public static $multisite;
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/**
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* Class self initialize.
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*
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* @since 1.0.0
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*/
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public static function instance() {
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new self();
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}
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/**
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* Class constructor.
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*
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* @since 1.0.0
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*/
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public function __construct() {
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// Skip on autosave or AJAX.
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if ( ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) OR ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
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return;
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}
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// Plugin options.
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self::update_options();
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// Get multisite status.
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self::$multisite = ( is_multisite() && array_key_exists( STATIFYBLACKLIST_BASE, (array) get_site_option( 'active_sitewide_plugins' ) ) );
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// Add Filter to statify hook if enabled.
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if ( 0 !== self::$_options['referer']['active'] ) {
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add_filter( 'statify__skip_tracking', array( 'StatifyBlacklist', 'apply_blacklist_filter' ) );
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}
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// Admin only filters.
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if ( is_admin() ) {
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// Load Textdomain (only needed for backend.
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load_plugin_textdomain( 'statifyblacklist', false, STATIFYBLACKLIST_DIR . '/lang/' );
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// Add actions.
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add_action( 'wpmu_new_blog', array( 'StatifyBlacklist_Install', 'init_site' ) );
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add_action( 'delete_blog', array( 'StatifyBlacklist_System', 'init_site' ) );
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add_filter( 'plugin_row_meta', array( 'StatifyBlacklist_Admin', 'plugin_meta_link' ), 10, 2 );
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if ( is_multisite() ) {
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add_action( 'network_admin_menu', array( 'StatifyBlacklist_Admin', '_add_menu_page' ) );
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add_filter(
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'network_admin_plugin_action_links', array(
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'StatifyBlacklist_Admin',
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'plugin_actions_links'
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), 10, 2
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);
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} else {
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add_action( 'admin_menu', array( 'StatifyBlacklist_Admin', '_add_menu_page' ) );
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add_filter( 'plugin_action_links', array( 'StatifyBlacklist_Admin', 'plugin_actions_links' ), 10, 2 );
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}
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}
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// CronJob to clean up database.
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if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
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if ( 1 === self::$_options['referer']['cron'] || 1 === self::$_options['target']['cron'] ) {
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add_action( 'statify_cleanup', array( 'StatifyBlacklist_Admin', 'cleanup_database' ) );
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}
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}
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}
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/**
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* Update options.
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*
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* @since 1.0.0
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* @since 1.2.1 update_options($options = null) Parameter with default value introduced.
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*
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* @param array $options Optional. New options to save.
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*
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*/
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public static function update_options( $options = null ) {
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self::$_options = wp_parse_args(
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get_option( 'statify-blacklist' ),
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self::defaultOptions()
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);
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}
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/**
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* Create default plugin configuration.
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*
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* @since 1.4.0
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*
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* @return array The options array.
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*/
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protected static function defaultOptions() {
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return array(
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'referer' => array(
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'active' => 0,
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'cron' => 0,
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'regexp' => 0,
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'blacklist' => array()
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),
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'target' => array(
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'active' => 0,
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'cron' => 0,
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'regexp' => 0,
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'blacklist' => array()
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),
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'ip' => array(
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'active' => 0,
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'blacklist' => array()
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),
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'version' => self::VERSION_MAIN
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);
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}
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/**
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* Apply the blacklist filter if active
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*
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* @since 1.0.0
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*
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* @return bool TRUE if referer matches blacklist.
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*/
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public static function apply_blacklist_filter() {
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// Referer blacklist.
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if ( isset( self::$_options['referer']['active'] ) && 0 !== self::$_options['referer']['active'] ) {
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// Regular Expression filtering since 1.3.0.
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if ( isset( self::$_options['referer']['regexp'] ) && self::$_options['referer']['regexp'] > 0 ) {
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// Get full referer string.
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$referer = ( isset( $_SERVER['HTTP_REFERER'] ) ? $_SERVER['HTTP_REFERER'] : '' );
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// Merge given regular expressions into one.
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$regexp = '/' . implode( "|", array_keys( self::$_options['referer']['blacklist'] ) ) . '/';
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if ( 2 === self::$_options['referer']['regexp'] ) {
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$regexp .= 'i';
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}
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// Check blacklist (return NULL to continue filtering).
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return ( 1 === preg_match( $regexp, $referer ) ) ? true : null;
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} else {
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// Extract relevant domain parts.
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$referer = strtolower( ( isset( $_SERVER['HTTP_REFERER'] ) ? parse_url( $_SERVER['HTTP_REFERER'], PHP_URL_HOST ) : '' ) );
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// Get blacklist.
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$blacklist = self::$_options['referer']['blacklist'];
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// Check blacklist.
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if ( isset( $blacklist[$referer] ) ) {
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return true;
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}
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}
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}
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// Target blacklist (since 1.4.0)
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if ( isset( self::$_options['target']['active'] ) && 0 !== self::$_options['target']['active'] ) {
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// Regular Expression filtering since 1.3.0.
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if ( isset( self::$_options['target']['regexp'] ) && 0 < self::$_options['target']['regexp'] ) {
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// Get full referer string.
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$target = ( isset( $_SERVER['REQUEST_URI'] ) ? wp_unslash( $_SERVER['REQUEST_URI'] ) : '/' );
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// Merge given regular expressions into one
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$regexp = '/' . implode( "|", array_keys( self::$_options['target']['blacklist'] ) ) . '/';
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if ( 2 === self::$_options['target']['regexp'] ) {
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$regexp .= 'i';
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}
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// Check blacklist (return NULL to continue filtering).
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return ( 1 === preg_match( $regexp, $target ) ) ? true : null;
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} else {
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// Extract target page.
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$target = ( isset( $_SERVER['REQUEST_URI'] ) ? wp_unslash( $_SERVER['REQUEST_URI'] ) : '/' );
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// Get blacklist.
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$blacklist = self::$_options['target']['blacklist'];
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// Check blacklist.
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if ( isset( $blacklist[$target] ) ) {
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return true;
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}
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}
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}
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// IP blacklist (since 1.4.0).
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if ( isset ( self::$_options['ip']['active'] ) && 0 !== self::$_options['ip']['active'] ) {
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if ( false !== ( $ip = self::getIP() ) ) {
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foreach ( self::$_options['ip']['blacklist'] as $net ) {
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if ( self::cidrMatch( $ip, $net ) ) {
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return true;
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}
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}
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}
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}
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// Skip and continue (return NULL), if all blacklists are inactive.
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return null;
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}
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/**
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* Helper method to determine the client's IP address.
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*
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* If a proxy is used, the X-Real-IP or X-Forwarded-For header is checked, otherwise the default remote address.
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* For performance reasons only the most common flags are checked. This might be even reduce by user configuration.
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* Maybe some community feedback will ease the decision on that.
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*
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* @return string|bool the client's IP address or FALSE, if none could be determined.
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*/
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private static function getIP() {
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foreach (
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array(
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// 'HTTP_CLIENT_IP',
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'HTTP_X_REAL_IP',
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'HTTP_X_FORWARDED_FOR',
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// 'HTTP_X_FORWARDED',
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// 'HTTP_X_CLUSTER_CLIENT_IP',
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// 'HTTP_FORWARDED_FOR',
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// 'HTTP_FORWARDED',
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'REMOTE_ADDR'
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) as $k
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) {
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if ( isset( $_SERVER[$k] ) ) {
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foreach ( explode( ',', $_SERVER[$k] ) as $ip ) {
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if ( false !== filter_var( $ip, FILTER_VALIDATE_IP ) ) {
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return $ip;
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}
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}
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}
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}
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return false;
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}
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/**
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* Helper function to check if an IP address matches a given subnet.
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*
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* @param string $ip IP address to check.
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* @param string $net IP address or subnet in CIDR notation.
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*
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* @return bool TRUE, if the given IP addresses matches the given subnet.
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*/
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private static function cidrMatch( $ip, $net ) {
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if ( substr_count( $net, ':' ) > 1 ) { // Check for IPv6.
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if ( ! ( ( extension_loaded( 'sockets' ) && defined( 'AF_INET6' ) ) || @inet_pton( '::1' ) ) ) {
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return false;
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}
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if ( false !== strpos( $net, '/' ) ) { // Parse CIDR subnet.
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list( $base, $mask ) = explode( '/', $net, 2 );
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if ( $mask < 1 || $mask > 128 ) {
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return false;
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}
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} else {
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$base = $net;
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$mask = 128;
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}
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$bytesAddr = unpack( 'n*', @inet_pton( $base ) );
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$bytesTest = unpack( 'n*', @inet_pton( $ip ) );
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if ( ! $bytesAddr || ! $bytesTest ) {
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return false;
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}
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for ( $i = 1, $ceil = ceil( $mask / 16 ); $i <= $ceil; ++ $i ) {
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$left = $mask - 16 * ( $i - 1 );
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$left = ( $left <= 16 ) ? $left : 16;
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$maskB = ~( 0xffff >> $left ) & 0xffff;
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if ( ( $bytesAddr[$i] & $maskB ) !== ( $bytesTest[$i] & $maskB ) ) {
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return false;
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}
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}
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return true;
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} else { // Check for IPv4.
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if ( ! filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 ) ) {
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return false;
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}
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if ( false !== strpos( $net, '/' ) ) { // Parse CIDR subnet.
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list( $base, $mask ) = explode( '/', $net, 2 );
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if ( $mask === '0' ) {
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return filter_var( $base, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 );
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}
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if ( $mask < 0 || $mask > 32 ) {
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return false;
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}
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} else { // Use single address.
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$base = $net;
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$mask = 32;
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}
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return ( 0 === substr_compare( sprintf( '%032b', ip2long( $ip ) ), sprintf( '%032b', ip2long( $base ) ), 0, $mask ) );
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}
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}
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}
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