WpOrg\Requests

Ssl::verify_certificate() │ public static │ WP 1.0

Verify the certificate against common name and subject alternative names

Unfortunately, PHP doesn't check the certificate against the alternative names, leading things like 'https://www.github.com/' to be invalid.

Method of the class: Ssl{}

No Hooks.

Return

true|false.

Usage

$result = Ssl::verify_certificate( $host, $cert );
$host(string|Stringable) (required)
Host name to verify against
$cert(array) (required)
Certificate data from openssl_x509_parse()

Ssl::verify_certificate() code WP 6.6.2

wp-includes/Requests/src/Ssl.php 
public static function verify_certificate($host, $cert) {
	if (InputValidator::is_string_or_stringable($host) === false) {
		throw InvalidArgument::create(1, '$host', 'string|Stringable', gettype($host));
	}

	if (InputValidator::has_array_access($cert) === false) {
		throw InvalidArgument::create(2, '$cert', 'array|ArrayAccess', gettype($cert));
	}

	$has_dns_alt = false;

	// Check the subjectAltName
	if (!empty($cert['extensions']['subjectAltName'])) {
		$altnames = explode(',', $cert['extensions']['subjectAltName']);
		foreach ($altnames as $altname) {
			$altname = trim($altname);
			if (strpos($altname, 'DNS:') !== 0) {
				continue;
			}

			$has_dns_alt = true;

			// Strip the 'DNS:' prefix and trim whitespace
			$altname = trim(substr($altname, 4));

			// Check for a match
			if (self::match_domain($host, $altname) === true) {
				return true;
			}
		}

		if ($has_dns_alt === true) {
			return false;
		}
	}

	// Fall back to checking the common name if we didn't get any dNSName
	// alt names, as per RFC2818
	if (!empty($cert['subject']['CN'])) {
		// Check for a match
		return (self::match_domain($host, $cert['subject']['CN']) === true);
	}

	return false;
}