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Edit File: class-certificate.php

<?php

defined('ABSPATH') or die("you do not have access to this page!");

if ( ! class_exists( 'rsssl_certificate' ) ) {
    class rsssl_certificate
    {
        private static $_this;

function __construct()
        {

if (isset(self::$_this))
                wp_die(sprintf(__('%s is a singleton class and you cannot create a second instance.', 'really-simple-ssl'), get_class($this)));

self::$_this = $this;

}

static function this()
        {
            return self::$_this;
        }

/**
         *
         * @since 3.0
         *
         * Check if the certificate is valid
         *
         * @return bool
         *
         */

public function is_valid()
        {

//Get current domain
            $domain = site_url();
            //Parse to strip off any /subfolder/
            $parse = parse_url($domain);
            $domain = $parse['host'];

if (function_exists('stream_context_get_params')) {
                //get certificate info
                $certinfo = $this->get_certinfo($domain);

if (!$certinfo) return false;

//Check if domain is valid
                $domain_valid = $this->is_domain_valid($certinfo, $domain);
                //Check if date is valid
                $date_valid = $this->is_date_valid($certinfo);
                //Domain and date valid? Return true
                if ($domain_valid && $date_valid) {
                    return true;
                }
            }
            return false;
        }

/**
        *
        * Check common name(s) and alternative name(s) on certificate and match them to the site_url ($domain)
        *
        * @since 3.0
        *
        * @access public
        *
        * @return bool
        *
        */

public function is_domain_valid($certinfo, $domain)
        {

//Get both the common name(s) and the alternative names from the certificate
            $certificate_common_names = isset($certinfo['subject']['CN']) ? $certinfo['subject']['CN'] : false;
            $certificate_alternative_names = isset($certinfo['extensions']['subjectAltName']) ? $certinfo['extensions']['subjectAltName'] : false;

//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 (($pos_cn !== false) || ($pos_an !== false)) 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;

//Get current date
            $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 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;

//A wildcard certificate is indicated by *, using this as our wildcard indicator
            $wildcard_indicator = "*";

//Check if the common name(s) contain an *
            $pos = strpos($certificate_common_name, $wildcard_indicator);

//If so, return true
            if ($pos !== false) return true;

return false;

}

/**
         *
         * Get the certificate info
         *
         * @since 3.0
         *
         * @access public
         *
         */

public function get_certinfo($url)
        {

$certinfo = get_transient('rsssl_certinfo');
            if (!$certinfo || RSSSL()->really_simple_ssl->is_settings_page()) {
                $url = 'https://'.$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, 30, STREAM_CLIENT_CONNECT, $get);
                        restore_error_handler();

if ($errno == 0 && $read) {

$cert = stream_context_get_params($read);
                            $certinfo = openssl_x509_parse($cert['options']['ssl']['peer_certificate']);
                        }
                    }
                }

set_transient('rsssl_certinfo', $certinfo, DAY_IN_SECONDS);
            }

if ($certinfo==='not-valid') return false;

if (!empty($certinfo)) return $certinfo;

return false;
        }

/**
         *
         * Catch errors
         *
         * @since 3.0
         *
         * @access public
         *
         */

public function custom_error_handling($errno, $errstr, $errfile, $errline, array $errcontext) {
            return true;
        }

//class closure
    }
}

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