<?php defined( 'ABSPATH' ) or die();
if ( ! class_exists( 'rsssl_certificate' ) ) {
class rsssl_certificate {
private static $_this;
public function __construct() {
if ( isset( self::$_this ) ) {
wp_die( 'you cannot create a second instance.' );
}
self::$_this = $this;
}
public static function this() {
return self::$_this;
}
/**
*
* @since 3.0
*
* Check if the certificate is valid
*
* @return bool
*
*/
public function is_valid(): bool {
$domain = $this->get_domain();
if ( ! $domain || ! function_exists( 'stream_context_get_params' ) ) {
set_transient( 'rsssl_certinfo', 'no-response', DAY_IN_SECONDS );
} else {
$certinfo = $this->get_certinfo( $domain );
if ( ! $certinfo ) {
return false;
}
$domain_valid = $this->is_domain_valid( $certinfo, $domain );
$date_valid = $this->is_date_valid( $certinfo );
if ( $domain_valid && $date_valid ) {
return true;
}
}
return false;
}
/**
* get domain
* @return string
*/
public function get_domain() {
$domain = site_url();
//Parse to strip off any /subfolder/
$parse = parse_url( $domain );
return isset( $parse['host'] ) ? $parse['host'] : false;
}
/**
*
* Check common name(s) and alternative name(s) on certificate and match them to the site_url ($domain)
*
* @since 3.0
*
* @access public
* @param $certinfo
* @param $domain
* @return bool
*
*/
public function is_domain_valid( $certinfo, $domain ): bool {
//first check standard situation
//Get both the common name(s) and the alternative names from the certificate
$certificate_common_names = isset( $certinfo['subject']['CN'] ) ? $certinfo['subject']['CN'] : '';
$certificate_alternative_names = isset( $certinfo['extensions']['subjectAltName'] ) ? $certinfo['extensions']['subjectAltName'] : '';
//Check if the domain is found in either the certificate common name(s) (CN) or alternative name(s) (AN)
$pos_cn = strpos( $certificate_common_names, $domain );
$pos_an = strpos( $certificate_alternative_names, $domain );
//If the domain is found, return true
if ( false !== $pos_cn || false !== $pos_an ) {
return true;
}
//if nothing found, we check for wildcard
//strip of asterisk, and check if the wildcard domain is part of current domain
$cert_domains = array();
if ( $this->is_wildcard() ) {
$certificate_alternative_names = explode( ', ', $certificate_alternative_names );
$cert_domains[] = trim( str_replace( '*', '', $certificate_common_names ) );
foreach ( $certificate_alternative_names as $subject_alt_name ) {
$cert_domains[] = trim( str_replace( '*', '', $subject_alt_name ) );
}
foreach ( $cert_domains as $cert_domain ) {
//If the wildcard domain is found, return true
if ( ( strpos( $domain, $cert_domain ) !== false ) ) {
return true;
}
}
}
return false;
}
/**
* Check if detection failed
* @return bool
*/
public function detection_failed() {
$certinfo = get_transient( 'rsssl_certinfo' );
if ( $certinfo && 'no-response' === $certinfo ) {
return true;
}
return false;
}
/**
*
* Check if the date is valid by looking at the validFrom and validTo times
*
* @since 3.0
*
* @access public
*
* @return bool
*
*/
public function is_date_valid( $certinfo ) {
//Get the start date and end date from the certificate
$start_date = isset( $certinfo['validFrom_time_t'] ) ? $certinfo['validFrom_time_t'] : false;
$end_date = isset( $certinfo['validTo_time_t'] ) ? $certinfo['validTo_time_t'] : false;
$current_date = time();
//Check if the current date is between the start date and end date. If so, return true
if ( $current_date > $start_date && ( $current_date < $end_date ) ) {
return true;
}
return false;
}
/**
* Check if the certificate is valid, but about to expire.
* @return bool
*/
public function about_to_expire() {
//if not valid, it's already expired
if ( ! $this->is_valid() ) {
return true;
}
//we have now renewed the cert info transient
$certinfo = get_transient( 'rsssl_certinfo' );
$end_date = isset( $certinfo['validTo_time_t'] ) ? $certinfo['validTo_time_t'] : false;
$expiry_days_time = strtotime( '+' . rsssl_le_manual_generation_renewal_check . ' days' );
if ( $expiry_days_time < $end_date ) {
return false;
} else {
return true;
}
}
/**
*
* Check if the certificate is a wildcard certificate
* Function is used in class-multisite.php to determine whether to show a notice for multisite subfolder installations without a wildcard certificate
*
* @since 3.0
*
* @access public
*
* @return bool
*
*/
public function is_wildcard() {
$domain = network_site_url();
$certinfo = $this->get_certinfo( $domain );
//Get the certificate common name
$certificate_common_name = isset( $certinfo['subject']['CN'] ) ? $certinfo['subject']['CN'] : false;
$subject_alt_names = isset( $certinfo['extensions']['subjectAltName'] ) ? explode( ', ', $certinfo['extensions']['subjectAltName'] ) : false;
//Check if the common name(s) contain an *
if ( strpos( $certificate_common_name, '*' ) ) {
return true;
}
if ( is_array( $subject_alt_names ) ) {
foreach ( $subject_alt_names as $subject_alt_name ) {
if ( strpos( $subject_alt_name, '*' ) !== false ) {
return true;
}
}
}
return false;
}
/**
*
* Get the certificate info
*
* @since 3.0
* @param string $url
* @return string|bool
* @access public
*
*/
public function get_certinfo( $url ) {
$certinfo = get_transient( 'rsssl_certinfo' );
//if the last check resulted in a "no response", we skip this check for a day.
if ( 'no-response' === $certinfo ) {
return false;
}
if ( ! $certinfo || RSSSL()->admin->is_settings_page() ) {
$url = 'https://' . str_replace( array( 'https://', 'http://' ), '', $url );
$original_parse = parse_url( $url, PHP_URL_HOST );
if ( $original_parse ) {
$get = stream_context_create( array( 'ssl' => array( 'capture_peer_cert' => true ) ) );
if ( $get ) {
set_error_handler( array( $this, 'custom_error_handling' ) );
$read = stream_socket_client( 'ssl://' . $original_parse . ':443', $errno, $errstr, 5, STREAM_CLIENT_CONNECT, $get );
restore_error_handler();
if ( ! $read ) {
$certinfo = 'no-response';
}
if ( 0 === $errno && $read ) {
$cert = stream_context_get_params( $read );
if ( isset( $cert['options']['ssl']['peer_certificate'] ) ) {
$certinfo = openssl_x509_parse( $cert['options']['ssl']['peer_certificate'] );
} else {
$certinfo = 'no-response';
}
}
}
}
set_transient( 'rsssl_certinfo', $certinfo, DAY_IN_SECONDS );
}
if ( 'not-valid' === $certinfo ) {
return false;
}
if ( ! empty( $certinfo ) ) {
return $certinfo;
}
return false;
}
/**
* Catch errors
*
* @since 3.0
*
* @access public
* @param $errno
* @param $errstr
* @param $errfile
* @param $errline
* @param array $errcontext
*
* @return bool
*/
public function custom_error_handling( $errno, $errstr, $errfile, $errline, $errcontext = array() ) {
return true;
}
//class closure
}
}
