How to Authenticate Requests to a WS-Security Protected Web Service Using PHP?

Connecting to a WS-Security protected Web Service with PHP

When attempting to connect to a web service that requires password protection and uses HTTPS, you may encounter authentication issues. This is because the PHP script initiates a request as soon as the service is defined, potentially before any authentication can be established.

Setting Authentication

To resolve this issue, you need to extend the SoapHeader class to create a Wsse compliant authentication. The following code demonstrates this:

class WsseAuthHeader extends SoapHeader {

    private $wss_ns = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd';

    function __construct($user, $pass, $ns = null) {
        if ($ns) {
            $this->wss_ns = $ns;
        }

        $auth = new stdClass();
        $auth->Username = new SoapVar($user, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);
        $auth->Password = new SoapVar($pass, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);

        $username_token = new stdClass();
        $username_token->UsernameToken = new SoapVar($auth, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns);

        $security_sv = new SoapVar(
            new SoapVar($username_token, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns),
            SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'Security', $this->wss_ns);
        parent::__construct($this->wss_ns, 'Security', $security_sv, true);
    }
}

Authenticating the Request

Once you have extended the SoapHeader, you can use it to authenticate the request:

$wsse_header = new WsseAuthHeader($username, $password);
$x = new SoapClient('{...}', array("trace" => 1, "exception" => 0));
$x->__setSoapHeaders(array($wsse_header));

Using Nonce and Timestamp

If you need to use WS-Security with a nonce and timestamp, you can use the updated version provided by Peter:

class WsseAuthHeader extends SoapHeader
{
    private $wss_ns = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd';
    private $wsu_ns = 'http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd';

    function __construct($user, $pass)
    {
        $created    = gmdate('Y-m-d\TH:i:s\Z');
        $nonce      = mt_rand();
        $passdigest = base64_encode(pack('H*', sha1(pack('H*', $nonce) . pack('a*', $created) . pack('a*', $pass))));

        $auth           = new stdClass();
        $auth->Username = new SoapVar($user, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);
        $auth->Password = new SoapVar($pass, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);
        $auth->Nonce    = new SoapVar($passdigest, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wss_ns);
        $auth->Created  = new SoapVar($created, XSD_STRING, NULL, $this->wss_ns, NULL, $this->wsu_ns);

        $username_token                = new stdClass();
        $username_token->UsernameToken = new SoapVar($auth, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns);

        $security_sv = new SoapVar(
            new SoapVar($username_token, SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'UsernameToken', $this->wss_ns),
            SOAP_ENC_OBJECT, NULL, $this->wss_ns, 'Security', $this->wss_ns);
        parent::__construct($this->wss_ns, 'Security', $security_sv, true);
    }
}

By utilizing these techniques, you can successfully connect to and authenticate requests to a WS-Security protected web service using PHP.

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