server.php

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<?php

/**
 * OpenID server protocol and logic.
 * 
 * Overview
 *
 * An OpenID server must perform three tasks:
 *
 *  1. Examine the incoming request to determine its nature and validity.
 *  2. Make a decision about how to respond to this request.
 *  3. Format the response according to the protocol.
 * 
 * The first and last of these tasks may performed by the {@link
 * Auth_OpenID_Server::decodeRequest()} and {@link
 * Auth_OpenID_Server::encodeResponse} methods.  Who gets to do the
 * intermediate task -- deciding how to respond to the request -- will
 * depend on what type of request it is.
 *
 * If it's a request to authenticate a user (a 'checkid_setup' or
 * 'checkid_immediate' request), you need to decide if you will assert
 * that this user may claim the identity in question.  Exactly how you
 * do that is a matter of application policy, but it generally
 * involves making sure the user has an account with your system and
 * is logged in, checking to see if that identity is hers to claim,
 * and verifying with the user that she does consent to releasing that
 * information to the party making the request.
 *
 * Examine the properties of the {@link Auth_OpenID_CheckIDRequest}
 * object, and if and when you've come to a decision, form a response
 * by calling {@link Auth_OpenID_CheckIDRequest::answer()}.
 *
 * Other types of requests relate to establishing associations between
 * client and server and verifing the authenticity of previous
 * communications.  {@link Auth_OpenID_Server} contains all the logic
 * and data necessary to respond to such requests; just pass it to
 * {@link Auth_OpenID_Server::handleRequest()}.
 *
 * OpenID Extensions
 * 
 * Do you want to provide other information for your users in addition
 * to authentication?  Version 1.2 of the OpenID protocol allows
 * consumers to add extensions to their requests.  For example, with
 * sites using the Simple Registration
 * Extension
 * (http://www.openidenabled.com/openid/simple-registration-extension/),
 * a user can agree to have their nickname and e-mail address sent to
 * a site when they sign up.
 *
 * Since extensions do not change the way OpenID authentication works,
 * code to handle extension requests may be completely separate from
 * the {@link Auth_OpenID_Request} class here.  But you'll likely want
 * data sent back by your extension to be signed.  {@link
 * Auth_OpenID_ServerResponse} provides methods with which you can add
 * data to it which can be signed with the other data in the OpenID
 * signature.
 *
 * For example:
 *
 * <pre>  // when request is a checkid_* request
 *  $response = $request->answer(true);
 *  // this will a signed 'openid.sreg.timezone' parameter to the response
 *  response.addField('sreg', 'timezone', 'America/Los_Angeles')</pre>
 *
 * Stores
 *
 * The OpenID server needs to maintain state between requests in order
 * to function.  Its mechanism for doing this is called a store.  The
 * store interface is defined in Interface.php.  Additionally, several
 * concrete store implementations are provided, so that most sites
 * won't need to implement a custom store.  For a store backed by flat
 * files on disk, see {@link Auth_OpenID_FileStore}.  For stores based
 * on MySQL, SQLite, or PostgreSQL, see the {@link
 * Auth_OpenID_SQLStore} subclasses.
 *
 * Upgrading
 *
 * The keys by which a server looks up associations in its store have
 * changed in version 1.2 of this library.  If your store has entries
 * created from version 1.0 code, you should empty it.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: See the COPYING file included in this distribution.
 *
 * @package OpenID
 * @author JanRain, Inc. <[e-mail]>
 * @copyright 2005 Janrain, Inc.
 * @license http://www.gnu.org/copyleft/lesser.html LGPL
 */

/**
 * Required imports
 */
require_once "Auth/OpenID.php";
require_once "Auth/OpenID/Association.php";
require_once "Auth/OpenID/CryptUtil.php";
require_once "Auth/OpenID/BigMath.php";
require_once "Auth/OpenID/DiffieHellman.php";
require_once "Auth/OpenID/KVForm.php";
require_once "Auth/OpenID/TrustRoot.php";
require_once "Auth/OpenID/ServerRequest.php";
require_once "Auth/OpenID/Message.php";
require_once "Auth/OpenID/Nonce.php";

define('AUTH_OPENID_HTTP_OK', 200);
define('AUTH_OPENID_HTTP_REDIRECT', 302);
define('AUTH_OPENID_HTTP_ERROR', 400);

/**
 * @access private
 */
global $_Auth_OpenID_Request_Modes;
$_Auth_OpenID_Request_Modes = array('checkid_setup',
                                    'checkid_immediate');

/**
 * @access private
 */
define('Auth_OpenID_ENCODE_KVFORM', 'kfvorm');

/**
 * @access private
 */
define('Auth_OpenID_ENCODE_URL', 'URL/redirect');

/**
 * @access private
 */
define('Auth_OpenID_ENCODE_HTML_FORM', 'HTML form');

/**
 * @access private
 */
function Auth_OpenID_isError($obj, $cls = 'Auth_OpenID_ServerError')
{
    return is_a($obj, $cls);
}

/**
 * An error class which gets instantiated and returned whenever an
 * OpenID protocol error occurs.  Be prepared to use this in place of
 * an ordinary server response.
 *
 * @package OpenID
 */
class Auth_OpenID_ServerError {
    /**
     * @access private
     */
    function Auth_OpenID_ServerError($message = null, $text = null,
                                     $reference = null, $contact = null)
    {
        $this->message = $message;
        $this->text = $text;
        $this->contact = $contact;
        $this->reference = $reference;
    }

    function getReturnTo()
    {
        if ($this->message &&
            $this->message->hasKey(Auth_OpenID_OPENID_NS, 'return_to')) {
            return $this->message->getArg(Auth_OpenID_OPENID_NS,
                                          'return_to');
        } else {
            return false;
        }
    }

    /**
     * Returns the return_to URL for the request which caused this
     * error.
     */
    function hasReturnTo()
    {
        return $this->getReturnTo() !== false;
    }

    /**
     * Encodes this error's response as a URL suitable for
     * redirection.  If the response has no return_to, another
     * Auth_OpenID_ServerError is returned.
     */
    function encodeToURL()
    {
        if (!$this->message) {
            return null;
        }

        $msg = $this->toMessage();
        return $msg->toURL($this->getReturnTo());
    }

    /**
     * Encodes the response to key-value form.  This is a
     * machine-readable format used to respond to messages which came
     * directly from the consumer and not through the user-agent.  See
     * the OpenID specification.
     */
    function encodeToKVForm()
    {
        return Auth_OpenID_KVForm::fromArray(
                                      array('mode' => 'error',
                                            'error' => $this->toString()));
    }

    function toFormMarkup()
    {
        $msg = $this->toMessage();
        return $msg->toFormMarkup($this->getReturnTo());
    }

    function toMessage()
    {
        // Generate a Message object for sending to the relying party,
        // after encoding.
        $namespace = $this->message->getOpenIDNamespace();
        $reply = new Auth_OpenID_Message($namespace);
        $reply->setArg(Auth_OpenID_OPENID_NS, 'mode', 'error');
        $reply->setArg(Auth_OpenID_OPENID_NS, 'error', $this->toString());

        if ($this->contact !== null) {
            $reply->setArg(Auth_OpenID_OPENID_NS, 'contact', $this->contact);
        }

        if ($this->reference !== null) {
            $reply->setArg(Auth_OpenID_OPENID_NS, 'reference',
                           $this->reference);
        }

        return $reply;
    }

    /**
     * Returns one of Auth_OpenID_ENCODE_URL,
     * Auth_OpenID_ENCODE_KVFORM, or null, depending on the type of
     * encoding expected for this error's payload.
     */
    function whichEncoding()
    {
        global $_Auth_OpenID_Request_Modes;

        if ($this->hasReturnTo()) {
            if ($this->message->isOpenID2() &&
                (strlen($this->encodeToURL()) >
                   Auth_OpenID_OPENID1_URL_LIMIT)) {
                return Auth_OpenID_ENCODE_HTML_FORM;
            } else {
                return Auth_OpenID_ENCODE_URL;
            }
        }

        if (!$this->message) {
            return null;
        }

        $mode = $this->message->getArg(Auth_OpenID_OPENID_NS,
                                       'mode');

        if ($mode) {
            if (!in_array($mode, $_Auth_OpenID_Request_Modes)) {
                return Auth_OpenID_ENCODE_KVFORM;
            }
        }
        return null;
    }

    /**
     * Returns this error message.
     */
    function toString()
    {
        if ($this->text) {
            return $this->text;
        } else {
            return get_class($this) . " error";
        }
    }
}

/**
 * Error returned by the server code when a return_to is absent from a
 * request.
 *
 * @package OpenID
 */
class Auth_OpenID_NoReturnToError extends Auth_OpenID_ServerError {
    function Auth_OpenID_NoReturnToError($message = null,
                                         $text = "No return_to URL available")
    {
        parent::Auth_OpenID_ServerError($message, $text);
    }

    function toString()
    {
        return "No return_to available";
    }
}

/**
 * An error indicating that the return_to URL is malformed.
 *
 * @package OpenID
 */
class Auth_OpenID_MalformedReturnURL extends Auth_OpenID_ServerError {
    function Auth_OpenID_MalformedReturnURL($message, $return_to)
    {
        $this->return_to = $return_to;
        parent::Auth_OpenID_ServerError($message, "malformed return_to URL");
    }
}

/**
 * This error is returned when the trust_root value is malformed.
 *
 * @package OpenID
 */
class Auth_OpenID_MalformedTrustRoot extends Auth_OpenID_ServerError {
    function Auth_OpenID_MalformedTrustRoot($message = null,
                                            $text = "Malformed trust root")
    {
        parent::Auth_OpenID_ServerError($message, $text);
    }

    function toString()
    {
        return "Malformed trust root";
    }
}

/**
 * The base class for all server request classes.
 *
 * @package OpenID
 */
class Auth_OpenID_Request {
    var $mode = null;
}

/**
 * A request to verify the validity of a previous response.
 *
 * @package OpenID
 */
class Auth_OpenID_CheckAuthRequest extends Auth_OpenID_Request {
    var $mode = "check_authentication";
    var $invalidate_handle = null;

    function Auth_OpenID_CheckAuthRequest($assoc_handle, $signed,
                                          $invalidate_handle = null)
    {
        $this->assoc_handle = $assoc_handle;
        $this->signed = $signed;
        if ($invalidate_handle !== null) {
            $this->invalidate_handle = $invalidate_handle;
        }
        $this->namespace = Auth_OpenID_OPENID2_NS;
        $this->message = null;
    }

    function fromMessage($message, $server=null)
    {
        $required_keys = array('assoc_handle', 'sig', 'signed');

        foreach ($required_keys as $k) {
            if (!$message->getArg(Auth_OpenID_OPENID_NS, $k)) {
                return new Auth_OpenID_ServerError($message,
                    sprintf("%s request missing required parameter %s from \
                            query", "check_authentication", $k));
            }
        }

        $assoc_handle = $message->getArg(Auth_OpenID_OPENID_NS, 'assoc_handle');
        $sig = $message->getArg(Auth_OpenID_OPENID_NS, 'sig');

        $signed_list = $message->getArg(Auth_OpenID_OPENID_NS, 'signed');
        $signed_list = explode(",", $signed_list);

        $signed = $message;
        if ($signed->hasKey(Auth_OpenID_OPENID_NS, 'mode')) {
            $signed->setArg(Auth_OpenID_OPENID_NS, 'mode', 'id_res');
        }

        $result = new Auth_OpenID_CheckAuthRequest($assoc_handle, $signed);
        $result->message = $message;
        $result->sig = $sig;
        $result->invalidate_handle = $message->getArg(Auth_OpenID_OPENID_NS,
                                                      'invalidate_handle');
        return $result;
    }

    function answer(&$signatory)
    {
        $is_valid = $signatory->verify($this->assoc_handle, $this->signed);

        // Now invalidate that assoc_handle so it this checkAuth
        // message cannot be replayed.
        $signatory->invalidate($this->assoc_handle, true);
        $response = new Auth_OpenID_ServerResponse($this);

        $response->fields->setArg(Auth_OpenID_OPENID_NS,
                                  'is_valid',
                                  ($is_valid ? "true" : "false"));

        if ($this->invalidate_handle) {
            $assoc = $signatory->getAssociation($this->invalidate_handle,
                                                false);
            if (!$assoc) {
                $response->fields->setArg(Auth_OpenID_OPENID_NS,
                                          'invalidate_handle',
                                          $this->invalidate_handle);
            }
        }
        return $response;
    }
}

/**
 * A class implementing plaintext server sessions.
 *
 * @package OpenID
 */
class Auth_OpenID_PlainTextServerSession {
    /**