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<?php
final class ITSEC_Network_Brute_Force_Utilities {
private static $network_endpoint = 'https://ipcheck-api.ithemes.com/';
/**
* Check visitor IP to see if it is banned by IPCheck.
*
* @param string $ip
*
* @return bool true if banned, false otherwise.
*/
public static function is_ip_banned( $ip = '' ) {
if ( ! $ip ) {
$ip = ITSEC_Lib::get_ip();
}
require_once( ITSEC_Core::get_core_dir() . '/lib/class-itsec-lib-ip-tools.php' );
if ( ! ITSEC_Lib_IP_Tools::validate( $ip ) || ITSEC_Lib::is_ip_whitelisted( $ip ) ) {
return false;
}
return self::get_server_response( 'check-ip', $ip );
}
/**
* Report visitor IP for blacklistable-offense to IPCheck.
*
* @param string $ip
*
* @return bool true if banned, false otherwise.
*/
public static function report_ip( $ip = '' ) {
if ( ! $ip ) {
$ip = ITSEC_Lib::get_ip();
}
require_once( ITSEC_Core::get_core_dir() . '/lib/class-itsec-lib-ip-tools.php' );
if ( ! ITSEC_Lib_IP_Tools::validate( $ip ) || ITSEC_Lib::is_ip_whitelisted( $ip ) ) {
return false;
}
return self::get_server_response( 'report-ip', $ip );
}
private static function get_server_response( $action, $ip ) {
$api_key = ITSEC_Modules::get_setting( 'network-brute-force', 'api_key' );
$api_secret = ITSEC_Modules::get_setting( 'network-brute-force', 'api_secret' );
if ( ! $api_key || ! $api_secret ) {
return false;
}
$cache = self::get_cache( $ip );
if ( 'check-ip' === $action ) {
if ( $cache['cache_ttl'] >= ITSEC_Core::get_current_time_gmt() ) {
return $cache['block'];
}
} elseif ( 'report-ip' === $action ) {
if ( $cache['report_ttl'] >= ITSEC_Core::get_current_time_gmt() ) {
return $cache['block'];
}
}
$args = json_encode( array(
'apikey' => $api_key,
'behavior' => 'brute-force-login',
'ip' => $ip,
'site' => home_url( '', 'http' ),
'timestamp' => ITSEC_Core::get_current_time_gmt(),
'login' => array(
'details' => ITSEC_Lib::get_login_details(),
'agent' => isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : '',
),
) );
$response = self::call_api( $action, array(), array(
'method' => 'POST',
'body' => array(
'request' => $args,
'signature' => self::hmac_sha1( $api_secret, $action . $args ),
),
) );
if ( is_wp_error( $response ) || ! isset( $response['body'] ) ) {
return false;
}
$response = json_decode( $response['body'], true );
if ( ! is_array( $response ) || empty( $response['success'] ) ) {
return false;
}
self::set_cache( $ip, $response );
$cache_seconds = isset( $response['cache_ttl'] ) ? absint( $response['cache_ttl'] ) : 3600;
if ( ! empty( $response['block'] ) ) {
$data = array(
'expires' => date( 'Y-m-d H:i:s', ITSEC_Core::get_current_time() + $cache_seconds ),
'expires_gmt' => date( 'Y-m-d H:i:s', ITSEC_Core::get_current_time_gmt() + $cache_seconds ),
'type' => 'host',
);
ITSEC_Log::add_action( 'ipcheck', 'ip-blocked', $data );
return true;
}
return false;
}
private static function set_cache( $ip, $response ) {
$cache = self::get_cache( $ip );
$time = ITSEC_Core::get_current_time_gmt();
if ( isset( $response['block'] ) ) {
$cache['block'] = (boolean) $response['block'];
}
if ( isset( $response['cache_ttl'] ) ) {
$cache['cache_ttl'] = intval( $response['cache_ttl'] ) + $time;
} elseif ( 0 === $cache['cache_ttl'] ) {
$cache['cache_ttl'] = $time + HOUR_IN_SECONDS;
}
if ( isset( $response['report_ttl'] ) ) {
$cache['report_ttl'] = intval( $response['report_ttl'] ) + $time;
}
$transient_time = max( $cache['cache_ttl'], $cache['report_ttl'] ) - $time;
set_site_transient( "itsec_ipcheck_$ip", $cache, $transient_time );
}
private static function get_cache( $ip ) {
$cache = get_site_transient( "itsec_ipcheck_$ip" );
$defaults = array(
'block' => false,
'cache_ttl' => 0,
'report_ttl' => 0,
);
if ( ! is_array( $cache ) ) {
return $defaults;
}
return array_merge( $defaults, $cache );
}
/**
* Calculates the HMAC of a string using SHA1.
*
* there is a native PHP hmac function, but we use this one for
* the widest compatibility with older PHP versions
*
* @param string $key the shared secret key used to generate the mac
* @param string $data data to be signed
*
*
* @return string base64 encoded hmac
*/
private static function hmac_sha1( $key, $data ) {
if ( strlen( $key ) > 64 ) {
$key = pack( 'H*', sha1( $key ) );
}
$key = str_pad( $key, 64, chr( 0x00 ) );
$ipad = str_repeat( chr( 0x36 ), 64 );
$opad = str_repeat( chr( 0x5c ), 64 );
$hmac = pack( 'H*', sha1( ( $key ^ $opad ) . pack( 'H*', sha1( ( $key ^ $ipad ) . $data ) ) ) );
return base64_encode( $hmac );
}
/**
* Retrieve an API key from the IPCheck server
*
* @since 4.5
*
* @param string $email the email address to associate with the key
* @param bool $optin true to optin to mailing list else false
*
* @return string|WP_Error The API key or a WP_Error object.
*/
public static function get_api_key( $email, $optin ) {
$email = sanitize_text_field( trim( $email ) );
if ( ! is_email( $email ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-get-api-key-bad-email', sprintf( __( 'The supplied email address (%s) is invalid. A valid email address is required in order to sign up for the Network Bruteforce Protection by iThemes.', 'better-wp-security' ), $email ) );
}
$response = self::call_api( 'request-key', array(
'email' => $email,
'optin' => $optin,
) );
if ( is_wp_error( $response ) ) {
return $response;
}
if ( ! isset( $response['body'] ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-get-api-key-failed-get-request', __( 'An unknown error prevented the API key request from succeeding. This problem could be due to a server configuration or plugin compatibility issue. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
$body = json_decode( $response['body'], true );
if ( ! is_array( $body ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-get-api-key-bad-response', __( 'An unknown error prevented the API key request from succeeding. The request for an API key returned an unrecognized response. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
if ( isset( $body['error']['message'] ) ) {
return new WP_Error(
'itsec-network-brute-force-utilities-get-api-key-' . ( isset( $body['error']['type'] ) ? $body['error']['type'] : 'unknown' ),
sprintf( __( 'There was an error returned from the Network Brute Force Protection API: %1$s', 'better-wp-security' ), $body['error']['message'] )
);
}
$key = trim( sanitize_text_field( $body['apikey'] ) );
if ( empty( $key ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-get-api-key-bad-response', __( 'An unknown error prevented the API key request from succeeding. The request for an API key returned an empty key. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
return $key;
}
/**
* Activate an IPCheck API Key
*
* @since 4.5
*
* @param string $api_key the API key to activate
*
* @return string|WP_Error IPCheck activation secret or a WP_Error object.
*/
public static function activate_api_key( $api_key ) {
$api_key = sanitize_text_field( trim( $api_key ) );
if ( empty( $api_key ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-activate-api-key-empty-key', __( 'An unknown error prevented the API key secret request from succeeding. The request for an API key submitted an empty key. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
$response = self::call_api( 'activate-key', array(
'apikey' => $api_key,
'site' => home_url( '', 'http' ),
) );
if ( is_wp_error( $response ) ) {
return $response;
}
if ( ! isset( $response['body'] ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-activate-api-key-failed-get-request', __( 'An unknown error prevented the API key secret request from succeeding. This problem could be due to a server configuration or plugin compatibility issue. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
$body = json_decode( $response['body'], true );
if ( ! is_array( $body ) || ! isset( $body['secret'] ) ) {
// If this is an error with a message, show that to the user
if ( ! empty( $body['error'] ) && ! empty( $body['error']['message'] ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-activate-api-key-error-response', sprintf( __( 'There was an error returned from the Network Brute Force Protection API: %1$s', 'better-wp-security' ), $body['error']['message'] ) );
}
return new WP_Error( 'itsec-network-brute-force-utilities-activate-api-key-bad-response', __( 'An unknown error prevented the API key secret request from succeeding. The request for an API key secret returned an unrecognized response. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
$secret = trim( sanitize_text_field( $body['secret'] ) );
if ( empty( $secret ) ) {
return new WP_Error( 'itsec-network-brute-force-utilities-activate-api-key-bad-response', __( 'An unknown error prevented the API key secrete request from succeeding. The request for an API key secret returned an empty key secret. Please wait a few minutes and try again.', 'better-wp-security' ) );
}
return $secret;
}
private static function call_api( $action, $query = array(), $args = array() ) {
$url = self::$network_endpoint;
$url = add_query_arg( 'action', $action, $url );
if ( $query ) {
$url = add_query_arg( $query, $url );
}
if ( ! isset( $args['user-agent'] ) ) {
if ( ITSEC_Core::is_pro() ) {
$args['user-agent'] = 'iThemes Security Pro/';
} else {
$args['user-agent'] = 'iThemes Security/';
}
$args['user-agent'] .= ITSEC_Core::get_plugin_version() . '-' . ITSEC_Core::get_plugin_build() . '; WordPress/' . get_bloginfo( 'version' );
}
$url = apply_filters( 'itsec_ipcheck_api_request_url', $url, $action, $query, $args );
$args = apply_filters( 'itsec_ipcheck_api_request_args', $args, $url, $action, $query );
return wp_remote_request( $url, $args );
}
}
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