317 lines
8.6 KiB
PHP
317 lines
8.6 KiB
PHP
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<?php
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/**
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* These functions are shared by the Protect module and its related json-endpoints
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*/
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/**
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* Returns an array of IP objects that will never be blocked by the Protect module
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*
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* The array is segmented into a local whitelist which applies only to the current site
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* and a global whitelist which, for multisite installs, applies to the entire networko
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*
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* @return array
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*/
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function jetpack_protect_format_whitelist() {
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$local_whitelist = jetpack_protect_get_local_whitelist();
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$formatted = array (
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'local' => array (),
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);
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foreach ( $local_whitelist as $item ) {
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if ( $item->range ) {
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$formatted['local'][] = $item->range_low . ' - ' . $item->range_high;
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} else {
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$formatted['local'][] = $item->ip_address;
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}
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}
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if ( is_multisite() && current_user_can( 'manage_network' ) ) {
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$formatted['global'] = array ();
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$global_whitelist = jetpack_protect_get_global_whitelist();
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if ( false === $global_whitelist ) {
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// if the global whitelist has never been set, check for a legacy option set prior to 3.6
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$global_whitelist = get_site_option( 'jetpack_protect_whitelist', array () );
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}
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foreach ( $global_whitelist as $item ) {
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if ( $item->range ) {
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$formatted['global'][] = $item->range_low . ' - ' . $item->range_high;
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} else {
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$formatted['global'][] = $item->ip_address;
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}
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}
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}
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return $formatted;
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}
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/**
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* Gets the local Protect whitelist
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*
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* The 'local' part of the whitelist only really applies to multisite installs,
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* which can have a network wide whitelist, as well as a local list that applies
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* only to the current site. On single site installs, there will only be a local
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* whitelist.
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*
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* @return array A list of IP Address objects or an empty array
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*/
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function jetpack_protect_get_local_whitelist() {
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$whitelist = Jetpack_Options::get_option( 'protect_whitelist' );
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if ( false === $whitelist ) {
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// The local whitelist has never been set
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if ( is_multisite() ) {
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// On a multisite, we can check for a legacy site_option that existed prior to v 3.6, or default to an empty array
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$whitelist = get_site_option( 'jetpack_protect_whitelist', array () );
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} else {
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// On a single site, we can just use an empty array
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$whitelist = array ();
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}
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}
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return $whitelist;
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}
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/**
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* Get the global, network-wide whitelist
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*
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* It will revert to the legacy site_option if jetpack_protect_global_whitelist has never been set
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*
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* @return array
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*/
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function jetpack_protect_get_global_whitelist() {
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$whitelist = get_site_option( 'jetpack_protect_global_whitelist' );
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if ( false === $whitelist ) {
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// The global whitelist has never been set. Check for legacy site_option, or default to an empty array
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$whitelist = get_site_option( 'jetpack_protect_whitelist', array () );
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}
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return $whitelist;
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}
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function jetpack_protect_save_whitelist( $whitelist, $global = false ) {
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$whitelist_error = false;
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$new_items = array ();
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if ( ! is_array( $whitelist ) ) {
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return new WP_Error( 'invalid_parameters', __( 'Expecting an array', 'jetpack' ) );
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}
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if ( $global && ! is_multisite() ) {
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return new WP_Error( 'invalid_parameters', __( 'Cannot use global flag on non-multisites', 'jetpack' ) );
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}
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if ( $global && ! current_user_can( 'manage_network' ) ) {
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return new WP_Error( 'permission_denied', __( 'Only super admins can edit the global whitelist', 'jetpack' ) );
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}
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// validate each item
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foreach ( $whitelist as $item ) {
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$item = trim( $item );
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if ( empty( $item ) ) {
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continue;
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}
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$range = false;
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if ( strpos( $item, '-' ) ) {
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$item = explode( '-', $item );
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$range = true;
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}
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$new_item = new stdClass();
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$new_item->range = $range;
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if ( ! empty( $range ) ) {
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$low = trim( $item[0] );
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$high = trim( $item[1] );
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if ( ! filter_var( $low, FILTER_VALIDATE_IP ) || ! filter_var( $high, FILTER_VALIDATE_IP ) ) {
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$whitelist_error = true;
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break;
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}
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if ( ! jetpack_convert_ip_address( $low ) || ! jetpack_convert_ip_address( $high ) ) {
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$whitelist_error = true;
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break;
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}
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$new_item->range_low = $low;
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$new_item->range_high = $high;
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} else {
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if ( ! filter_var( $item, FILTER_VALIDATE_IP ) ) {
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$whitelist_error = true;
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break;
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}
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if ( ! jetpack_convert_ip_address( $item ) ) {
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$whitelist_error = true;
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break;
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}
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$new_item->ip_address = $item;
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}
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$new_items[] = $new_item;
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} // end item loop
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if ( ! empty( $whitelist_error ) ) {
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return new WP_Error( 'invalid_ip', __( 'One of your IP addresses was not valid.', 'jetpack' ) );
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}
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if ( $global ) {
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update_site_option( 'jetpack_protect_global_whitelist', $new_items );
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// once a user has saved their global whitelist, we can permanently remove the legacy option
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delete_site_option( 'jetpack_protect_whitelist' );
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} else {
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Jetpack_Options::update_option( 'protect_whitelist', $new_items );
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}
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return true;
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}
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function jetpack_protect_get_ip() {
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$trusted_header_data = get_site_option( 'trusted_ip_header' );
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if ( isset( $trusted_header_data->trusted_header ) && isset( $_SERVER[ $trusted_header_data->trusted_header ] ) ) {
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$ip = $_SERVER[ $trusted_header_data->trusted_header ];
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$segments = $trusted_header_data->segments;
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$reverse_order = $trusted_header_data->reverse;
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} else {
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$ip = $_SERVER['REMOTE_ADDR'];
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}
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$ips = explode( ',', $ip );
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if ( ! isset( $segments ) || ! $segments ) {
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$segments = 1;
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}
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if ( isset( $reverse_order ) && $reverse_order ) {
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$ips = array_reverse( $ips );
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}
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$ip_count = count( $ips );
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if ( 1 == $ip_count ) {
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return jetpack_clean_ip( $ips[0] );
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} elseif ( $ip_count >= $segments ) {
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$the_one = $ip_count - $segments;
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return jetpack_clean_ip( $ips[ $the_one ] );
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} else {
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return jetpack_clean_ip( $_SERVER['REMOTE_ADDR'] );
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}
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}
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function jetpack_clean_ip( $ip ) {
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$ip = trim( $ip );
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// Check for IPv4 IP cast as IPv6
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if ( preg_match( '/^::ffff:(\d+\.\d+\.\d+\.\d+)$/', $ip, $matches ) ) {
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$ip = $matches[1];
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}
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return $ip;
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}
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/**
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* Checks an IP to see if it is within a private range
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*
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* @param int $ip
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*
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* @return bool
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*/
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function jetpack_protect_ip_is_private( $ip ) {
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// we are dealing with ipv6, so we can simply rely on filter_var
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if ( false === strpos( $ip, '.' ) ) {
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return ! filter_var( $ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE );
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}
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// we are dealing with ipv4
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$private_ip4_addresses = array (
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'10.0.0.0|10.255.255.255', // single class A network
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'172.16.0.0|172.31.255.255', // 16 contiguous class B network
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'192.168.0.0|192.168.255.255', // 256 contiguous class C network
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'169.254.0.0|169.254.255.255', // Link-local address also referred to as Automatic Private IP Addressing
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'127.0.0.0|127.255.255.255' // localhost
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);
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$long_ip = ip2long( $ip );
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if ( -1 != $long_ip ) {
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foreach ( $private_ip4_addresses as $pri_addr ) {
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list ( $start, $end ) = explode( '|', $pri_addr );
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if ( $long_ip >= ip2long( $start ) && $long_ip <= ip2long( $end ) ) {
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return true;
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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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* Uses inet_pton if available to convert an IP address to a binary string.
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* If inet_pton is not available, ip2long will convert the address to an integer.
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* Returns false if an invalid IP address is given.
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*
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* NOTE: ip2long will return false for any ipv6 address. servers that do not support
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* inet_pton will not support ipv6
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*
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* @param $ip
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*
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* @return int|string|bool
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*/
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function jetpack_convert_ip_address( $ip ) {
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if ( function_exists( 'inet_pton' ) ) {
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return inet_pton( $ip );
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}
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return ip2long( $ip );
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}
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/**
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* Checks that a given IP address is within a given low - high range.
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* Servers that support inet_pton will use that function to convert the ip to number,
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* while other servers will use ip2long.
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*
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* NOTE: servers that do not support inet_pton cannot support ipv6.
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*
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* @param $ip
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* @param $range_low
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* @param $range_high
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*
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* @return bool
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*/
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function jetpack_protect_ip_address_is_in_range( $ip, $range_low, $range_high ) {
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// inet_pton will give us binary string of an ipv4 or ipv6
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// we can then use strcmp to see if the address is in range
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if ( function_exists( 'inet_pton' ) ) {
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$ip_num = inet_pton( $ip );
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$ip_low = inet_pton( $range_low );
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$ip_high = inet_pton( $range_high );
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if ( $ip_num && $ip_low && $ip_high && strcmp( $ip_num, $ip_low ) >= 0 && strcmp( $ip_num, $ip_high ) <= 0 ) {
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return true;
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}
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// ip2long will give us an integer of an ipv4 address only. it will produce FALSE for ipv6
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} else {
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$ip_num = ip2long( $ip );
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$ip_low = ip2long( $range_low );
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$ip_high = ip2long( $range_high );
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if ( $ip_num && $ip_low && $ip_high && $ip_num >= $ip_low && $ip_num <= $ip_high ) {
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return true;
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}
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}
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return false;
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}
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