Verify SSL certificate on PHP 5.5 and older

 uphpCAS.php

@@ -101,6 +101,27 @@
            ),
        );
        
        if(version_compare(PHP_VERSION, '5.6', '<')) {
            $cafiles = array(
                '/etc/ssl/certs/ca-certificates.crt',
                '/etc/ssl/certs/ca-bundle.crt',
                '/etc/pki/tls/certs/ca-bundle.crt',
            );
            $cafile = NULL;
            foreach($cafiles as $file) {
                if(is_file($file)) {
                    $cafile = $file;
                    break;
                }
            }
			
            $url = parse_url($this->serverUrl);
            $context['ssl']['cafile'] = $cafile;
            $context['ssl']['ciphers'] = 'ECDH:DH:AES:CAMELLIA:!SSLv2:!aNULL'
                    .':!eNULL:!EXPORT:!DES:!3DES:!MD5:!RC4:!ADH:!PSK:!SRP';
            $context['ssl']['CN_match'] = $url['host'];
        }
		
        $data = file_get_contents($this->serverUrl
                    .'/serviceValidate?service='.urlencode($this->serviceUrl)
                    .'&ticket='.urlencode($ticket),