--- /dev/null
+<?php
+
+/**
+ * This module documents the main interface with the OpenID consumer
+ * library. The only part of the library which has to be used and
+ * isn't documented in full here is the store required to create an
+ * Auth_OpenID_Consumer instance. More on the abstract store type and
+ * concrete implementations of it that are provided in the
+ * documentation for the Auth_OpenID_Consumer constructor.
+ *
+ * OVERVIEW
+ *
+ * The OpenID identity verification process most commonly uses the
+ * following steps, as visible to the user of this library:
+ *
+ * 1. The user enters their OpenID into a field on the consumer's
+ * site, and hits a login button.
+ * 2. The consumer site discovers the user's OpenID server using the
+ * YADIS protocol.
+ * 3. The consumer site sends the browser a redirect to the identity
+ * server. This is the authentication request as described in
+ * the OpenID specification.
+ * 4. The identity server's site sends the browser a redirect back
+ * to the consumer site. This redirect contains the server's
+ * response to the authentication request.
+ *
+ * The most important part of the flow to note is the consumer's site
+ * must handle two separate HTTP requests in order to perform the full
+ * identity check.
+ *
+ * LIBRARY DESIGN
+ *
+ * This consumer library is designed with that flow in mind. The goal
+ * is to make it as easy as possible to perform the above steps
+ * securely.
+ *
+ * At a high level, there are two important parts in the consumer
+ * library. The first important part is this module, which contains
+ * the interface to actually use this library. The second is the
+ * Auth_OpenID_Interface class, which describes the interface to use
+ * if you need to create a custom method for storing the state this
+ * library needs to maintain between requests.
+ *
+ * In general, the second part is less important for users of the
+ * library to know about, as several implementations are provided
+ * which cover a wide variety of situations in which consumers may use
+ * the library.
+ *
+ * This module contains a class, Auth_OpenID_Consumer, with methods
+ * corresponding to the actions necessary in each of steps 2, 3, and 4
+ * described in the overview. Use of this library should be as easy
+ * as creating an Auth_OpenID_Consumer instance and calling the
+ * methods appropriate for the action the site wants to take.
+ *
+ * STORES AND DUMB MODE
+ *
+ * OpenID is a protocol that works best when the consumer site is able
+ * to store some state. This is the normal mode of operation for the
+ * protocol, and is sometimes referred to as smart mode. There is
+ * also a fallback mode, known as dumb mode, which is available when
+ * the consumer site is not able to store state. This mode should be
+ * avoided when possible, as it leaves the implementation more
+ * vulnerable to replay attacks.
+ *
+ * The mode the library works in for normal operation is determined by
+ * the store that it is given. The store is an abstraction that
+ * handles the data that the consumer needs to manage between http
+ * requests in order to operate efficiently and securely.
+ *
+ * Several store implementation are provided, and the interface is
+ * fully documented so that custom stores can be used as well. See
+ * the documentation for the Auth_OpenID_Consumer class for more
+ * information on the interface for stores. The implementations that
+ * are provided allow the consumer site to store the necessary data in
+ * several different ways, including several SQL databases and normal
+ * files on disk.
+ *
+ * There is an additional concrete store provided that puts the system
+ * in dumb mode. This is not recommended, as it removes the library's
+ * ability to stop replay attacks reliably. It still uses time-based
+ * checking to make replay attacks only possible within a small
+ * window, but they remain possible within that window. This store
+ * should only be used if the consumer site has no way to retain data
+ * between requests at all.
+ *
+ * IMMEDIATE MODE
+ *
+ * In the flow described above, the user may need to confirm to the
+ * lidentity server that it's ok to authorize his or her identity.
+ * The server may draw pages asking for information from the user
+ * before it redirects the browser back to the consumer's site. This
+ * is generally transparent to the consumer site, so it is typically
+ * ignored as an implementation detail.
+ *
+ * There can be times, however, where the consumer site wants to get a
+ * response immediately. When this is the case, the consumer can put
+ * the library in immediate mode. In immediate mode, there is an
+ * extra response possible from the server, which is essentially the
+ * server reporting that it doesn't have enough information to answer
+ * the question yet.
+ *
+ * USING THIS LIBRARY
+ *
+ * Integrating this library into an application is usually a
+ * relatively straightforward process. The process should basically
+ * follow this plan:
+ *
+ * Add an OpenID login field somewhere on your site. When an OpenID
+ * is entered in that field and the form is submitted, it should make
+ * a request to the your site which includes that OpenID URL.
+ *
+ * First, the application should instantiate the Auth_OpenID_Consumer
+ * class using the store of choice (Auth_OpenID_FileStore or one of
+ * the SQL-based stores). If the application has a custom
+ * session-management implementation, an object implementing the
+ * {@link Auth_Yadis_PHPSession} interface should be passed as the
+ * second parameter. Otherwise, the default uses $_SESSION.
+ *
+ * Next, the application should call the Auth_OpenID_Consumer object's
+ * 'begin' method. This method takes the OpenID URL. The 'begin'
+ * method returns an Auth_OpenID_AuthRequest object.
+ *
+ * Next, the application should call the 'redirectURL' method of the
+ * Auth_OpenID_AuthRequest object. The 'return_to' URL parameter is
+ * the URL that the OpenID server will send the user back to after
+ * attempting to verify his or her identity. The 'trust_root' is the
+ * URL (or URL pattern) that identifies your web site to the user when
+ * he or she is authorizing it. Send a redirect to the resulting URL
+ * to the user's browser.
+ *
+ * That's the first half of the authentication process. The second
+ * half of the process is done after the user's ID server sends the
+ * user's browser a redirect back to your site to complete their
+ * login.
+ *
+ * When that happens, the user will contact your site at the URL given
+ * as the 'return_to' URL to the Auth_OpenID_AuthRequest::redirectURL
+ * call made above. The request will have several query parameters
+ * added to the URL by the identity server as the information
+ * necessary to finish the request.
+ *
+ * Lastly, instantiate an Auth_OpenID_Consumer instance as above and
+ * call its 'complete' method, passing in all the received query
+ * arguments.
+ *
+ * There are multiple possible return types possible from that
+ * method. These indicate the whether or not the login was successful,
+ * and include any additional information appropriate for their type.
+ *
+ * PHP versions 4 and 5
+ *
+ * LICENSE: See the COPYING file included in this distribution.
+ *
+ * @package OpenID
+ * @author JanRain, Inc. <openid@janrain.com>
+ * @copyright 2005-2008 Janrain, Inc.
+ * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
+ */
+
+/**
+ * Require utility classes and functions for the consumer.
+ */
+require_once "Auth/OpenID.php";
+require_once "Auth/OpenID/Message.php";
+require_once "Auth/OpenID/HMAC.php";
+require_once "Auth/OpenID/Association.php";
+require_once "Auth/OpenID/CryptUtil.php";
+require_once "Auth/OpenID/DiffieHellman.php";
+require_once "Auth/OpenID/KVForm.php";
+require_once "Auth/OpenID/Nonce.php";
+require_once "Auth/OpenID/Discover.php";
+require_once "Auth/OpenID/URINorm.php";
+require_once "Auth/Yadis/Manager.php";
+require_once "Auth/Yadis/XRI.php";
+
+/**
+ * This is the status code returned when the complete method returns
+ * successfully.
+ */
+define('Auth_OpenID_SUCCESS', 'success');
+
+/**
+ * Status to indicate cancellation of OpenID authentication.
+ */
+define('Auth_OpenID_CANCEL', 'cancel');
+
+/**
+ * This is the status code completeAuth returns when the value it
+ * received indicated an invalid login.
+ */
+define('Auth_OpenID_FAILURE', 'failure');
+
+/**
+ * This is the status code completeAuth returns when the
+ * {@link Auth_OpenID_Consumer} instance is in immediate mode, and the
+ * identity server sends back a URL to send the user to to complete his
+ * or her login.
+ */
+define('Auth_OpenID_SETUP_NEEDED', 'setup needed');
+
+/**
+ * This is the status code beginAuth returns when the page fetched
+ * from the entered OpenID URL doesn't contain the necessary link tags
+ * to function as an identity page.
+ */
+define('Auth_OpenID_PARSE_ERROR', 'parse error');
+
+/**
+ * An OpenID consumer implementation that performs discovery and does
+ * session management. See the Consumer.php file documentation for
+ * more information.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_Consumer {
+
+ /**
+ * @access private
+ */
+ var $discoverMethod = 'Auth_OpenID_discover';
+
+ /**
+ * @access private
+ */
+ var $session_key_prefix = "_openid_consumer_";
+
+ /**
+ * @access private
+ */
+ var $_token_suffix = "last_token";
+
+ /**
+ * Initialize a Consumer instance.
+ *
+ * You should create a new instance of the Consumer object with
+ * every HTTP request that handles OpenID transactions.
+ *
+ * @param Auth_OpenID_OpenIDStore $store This must be an object
+ * that implements the interface in {@link
+ * Auth_OpenID_OpenIDStore}. Several concrete implementations are
+ * provided, to cover most common use cases. For stores backed by
+ * MySQL, PostgreSQL, or SQLite, see the {@link
+ * Auth_OpenID_SQLStore} class and its sublcasses. For a
+ * filesystem-backed store, see the {@link Auth_OpenID_FileStore}
+ * module. As a last resort, if it isn't possible for the server
+ * to store state at all, an instance of {@link
+ * Auth_OpenID_DumbStore} can be used.
+ *
+ * @param mixed $session An object which implements the interface
+ * of the {@link Auth_Yadis_PHPSession} class. Particularly, this
+ * object is expected to have these methods: get($key), set($key),
+ * $value), and del($key). This defaults to a session object
+ * which wraps PHP's native session machinery. You should only
+ * need to pass something here if you have your own sessioning
+ * implementation.
+ *
+ * @param str $consumer_cls The name of the class to instantiate
+ * when creating the internal consumer object. This is used for
+ * testing.
+ */
+ function Auth_OpenID_Consumer($store, $session = null,
+ $consumer_cls = null)
+ {
+ if ($session === null) {
+ $session = new Auth_Yadis_PHPSession();
+ }
+
+ $this->session = $session;
+
+ if ($consumer_cls !== null) {
+ $this->consumer = new $consumer_cls($store);
+ } else {
+ $this->consumer = new Auth_OpenID_GenericConsumer($store);
+ }
+
+ $this->_token_key = $this->session_key_prefix . $this->_token_suffix;
+ }
+
+ /**
+ * Used in testing to define the discovery mechanism.
+ *
+ * @access private
+ */
+ function getDiscoveryObject($session, $openid_url,
+ $session_key_prefix)
+ {
+ return new Auth_Yadis_Discovery($session, $openid_url,
+ $session_key_prefix);
+ }
+
+ /**
+ * Start the OpenID authentication process. See steps 1-2 in the
+ * overview at the top of this file.
+ *
+ * @param string $user_url Identity URL given by the user. This
+ * method performs a textual transformation of the URL to try and
+ * make sure it is normalized. For example, a user_url of
+ * example.com will be normalized to http://example.com/
+ * normalizing and resolving any redirects the server might issue.
+ *
+ * @param bool $anonymous True if the OpenID request is to be sent
+ * to the server without any identifier information. Use this
+ * when you want to transport data but don't want to do OpenID
+ * authentication with identifiers.
+ *
+ * @return Auth_OpenID_AuthRequest $auth_request An object
+ * containing the discovered information will be returned, with a
+ * method for building a redirect URL to the server, as described
+ * in step 3 of the overview. This object may also be used to add
+ * extension arguments to the request, using its 'addExtensionArg'
+ * method.
+ */
+ function begin($user_url, $anonymous=false)
+ {
+ $openid_url = $user_url;
+
+ $disco = $this->getDiscoveryObject($this->session,
+ $openid_url,
+ $this->session_key_prefix);
+
+ // Set the 'stale' attribute of the manager. If discovery
+ // fails in a fatal way, the stale flag will cause the manager
+ // to be cleaned up next time discovery is attempted.
+
+ $m = $disco->getManager();
+ $loader = new Auth_Yadis_ManagerLoader();
+
+ if ($m) {
+ if ($m->stale) {
+ $disco->destroyManager();
+ } else {
+ $m->stale = true;
+ $disco->session->set($disco->session_key,
+ serialize($loader->toSession($m)));
+ }
+ }
+
+ $endpoint = $disco->getNextService($this->discoverMethod,
+ $this->consumer->fetcher);
+
+ // Reset the 'stale' attribute of the manager.
+ $m = $disco->getManager();
+ if ($m) {
+ $m->stale = false;
+ $disco->session->set($disco->session_key,
+ serialize($loader->toSession($m)));
+ }
+
+ if ($endpoint === null) {
+ return null;
+ } else {
+ return $this->beginWithoutDiscovery($endpoint,
+ $anonymous);
+ }
+ }
+
+ /**
+ * Start OpenID verification without doing OpenID server
+ * discovery. This method is used internally by Consumer.begin
+ * after discovery is performed, and exists to provide an
+ * interface for library users needing to perform their own
+ * discovery.
+ *
+ * @param Auth_OpenID_ServiceEndpoint $endpoint an OpenID service
+ * endpoint descriptor.
+ *
+ * @param bool anonymous Set to true if you want to perform OpenID
+ * without identifiers.
+ *
+ * @return Auth_OpenID_AuthRequest $auth_request An OpenID
+ * authentication request object.
+ */
+ function beginWithoutDiscovery($endpoint, $anonymous=false)
+ {
+ $loader = new Auth_OpenID_ServiceEndpointLoader();
+ $auth_req = $this->consumer->begin($endpoint);
+ $this->session->set($this->_token_key,
+ $loader->toSession($auth_req->endpoint));
+ if (!$auth_req->setAnonymous($anonymous)) {
+ return new Auth_OpenID_FailureResponse(null,
+ "OpenID 1 requests MUST include the identifier " .
+ "in the request.");
+ }
+ return $auth_req;
+ }
+
+ /**
+ * Called to interpret the server's response to an OpenID
+ * request. It is called in step 4 of the flow described in the
+ * consumer overview.
+ *
+ * @param string $current_url The URL used to invoke the application.
+ * Extract the URL from your application's web
+ * request framework and specify it here to have it checked
+ * against the openid.current_url value in the response. If
+ * the current_url URL check fails, the status of the
+ * completion will be FAILURE.
+ *
+ * @param array $query An array of the query parameters (key =>
+ * value pairs) for this HTTP request. Defaults to null. If
+ * null, the GET or POST data are automatically gotten from the
+ * PHP environment. It is only useful to override $query for
+ * testing.
+ *
+ * @return Auth_OpenID_ConsumerResponse $response A instance of an
+ * Auth_OpenID_ConsumerResponse subclass. The type of response is
+ * indicated by the status attribute, which will be one of
+ * SUCCESS, CANCEL, FAILURE, or SETUP_NEEDED.
+ */
+ function complete($current_url, $query=null)
+ {
+ if ($current_url && !is_string($current_url)) {
+ // This is ugly, but we need to complain loudly when
+ // someone uses the API incorrectly.
+ trigger_error("current_url must be a string; see NEWS file " .
+ "for upgrading notes.",
+ E_USER_ERROR);
+ }
+
+ if ($query === null) {
+ $query = Auth_OpenID::getQuery();
+ }
+
+ $loader = new Auth_OpenID_ServiceEndpointLoader();
+ $endpoint_data = $this->session->get($this->_token_key);
+ $endpoint =
+ $loader->fromSession($endpoint_data);
+
+ $message = Auth_OpenID_Message::fromPostArgs($query);
+ $response = $this->consumer->complete($message, $endpoint,
+ $current_url);
+ $this->session->del($this->_token_key);
+
+ if (in_array($response->status, array(Auth_OpenID_SUCCESS,
+ Auth_OpenID_CANCEL))) {
+ if ($response->identity_url !== null) {
+ $disco = $this->getDiscoveryObject($this->session,
+ $response->identity_url,
+ $this->session_key_prefix);
+ $disco->cleanup(true);
+ }
+ }
+
+ return $response;
+ }
+}
+
+/**
+ * A class implementing HMAC/DH-SHA1 consumer sessions.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_DiffieHellmanSHA1ConsumerSession {
+ var $session_type = 'DH-SHA1';
+ var $hash_func = 'Auth_OpenID_SHA1';
+ var $secret_size = 20;
+ var $allowed_assoc_types = array('HMAC-SHA1');
+
+ function Auth_OpenID_DiffieHellmanSHA1ConsumerSession($dh = null)
+ {
+ if ($dh === null) {
+ $dh = new Auth_OpenID_DiffieHellman();
+ }
+
+ $this->dh = $dh;
+ }
+
+ function getRequest()
+ {
+ $math = Auth_OpenID_getMathLib();
+
+ $cpub = $math->longToBase64($this->dh->public);
+
+ $args = array('dh_consumer_public' => $cpub);
+
+ if (!$this->dh->usingDefaultValues()) {
+ $args = array_merge($args, array(
+ 'dh_modulus' =>
+ $math->longToBase64($this->dh->mod),
+ 'dh_gen' =>
+ $math->longToBase64($this->dh->gen)));
+ }
+
+ return $args;
+ }
+
+ function extractSecret($response)
+ {
+ if (!$response->hasKey(Auth_OpenID_OPENID_NS,
+ 'dh_server_public')) {
+ return null;
+ }
+
+ if (!$response->hasKey(Auth_OpenID_OPENID_NS,
+ 'enc_mac_key')) {
+ return null;
+ }
+
+ $math = Auth_OpenID_getMathLib();
+
+ $spub = $math->base64ToLong($response->getArg(Auth_OpenID_OPENID_NS,
+ 'dh_server_public'));
+ $enc_mac_key = base64_decode($response->getArg(Auth_OpenID_OPENID_NS,
+ 'enc_mac_key'));
+
+ return $this->dh->xorSecret($spub, $enc_mac_key, $this->hash_func);
+ }
+}
+
+/**
+ * A class implementing HMAC/DH-SHA256 consumer sessions.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_DiffieHellmanSHA256ConsumerSession extends
+ Auth_OpenID_DiffieHellmanSHA1ConsumerSession {
+ var $session_type = 'DH-SHA256';
+ var $hash_func = 'Auth_OpenID_SHA256';
+ var $secret_size = 32;
+ var $allowed_assoc_types = array('HMAC-SHA256');
+}
+
+/**
+ * A class implementing plaintext consumer sessions.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_PlainTextConsumerSession {
+ var $session_type = 'no-encryption';
+ var $allowed_assoc_types = array('HMAC-SHA1', 'HMAC-SHA256');
+
+ function getRequest()
+ {
+ return array();
+ }
+
+ function extractSecret($response)
+ {
+ if (!$response->hasKey(Auth_OpenID_OPENID_NS, 'mac_key')) {
+ return null;
+ }
+
+ return base64_decode($response->getArg(Auth_OpenID_OPENID_NS,
+ 'mac_key'));
+ }
+}
+
+/**
+ * Returns available session types.
+ */
+function Auth_OpenID_getAvailableSessionTypes()
+{
+ $types = array(
+ 'no-encryption' => 'Auth_OpenID_PlainTextConsumerSession',
+ 'DH-SHA1' => 'Auth_OpenID_DiffieHellmanSHA1ConsumerSession',
+ 'DH-SHA256' => 'Auth_OpenID_DiffieHellmanSHA256ConsumerSession');
+
+ return $types;
+}
+
+/**
+ * This class is the interface to the OpenID consumer logic.
+ * Instances of it maintain no per-request state, so they can be
+ * reused (or even used by multiple threads concurrently) as needed.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_GenericConsumer {
+ /**
+ * @access private
+ */
+ var $discoverMethod = 'Auth_OpenID_discover';
+
+ /**
+ * This consumer's store object.
+ */
+ var $store;
+
+ /**
+ * @access private
+ */
+ var $_use_assocs;
+
+ /**
+ * @access private
+ */
+ var $openid1_nonce_query_arg_name = 'janrain_nonce';
+
+ /**
+ * Another query parameter that gets added to the return_to for
+ * OpenID 1; if the user's session state is lost, use this claimed
+ * identifier to do discovery when verifying the response.
+ */
+ var $openid1_return_to_identifier_name = 'openid1_claimed_id';
+
+ /**
+ * This method initializes a new {@link Auth_OpenID_Consumer}
+ * instance to access the library.
+ *
+ * @param Auth_OpenID_OpenIDStore $store This must be an object
+ * that implements the interface in {@link Auth_OpenID_OpenIDStore}.
+ * Several concrete implementations are provided, to cover most common use
+ * cases. For stores backed by MySQL, PostgreSQL, or SQLite, see
+ * the {@link Auth_OpenID_SQLStore} class and its sublcasses. For a
+ * filesystem-backed store, see the {@link Auth_OpenID_FileStore} module.
+ * As a last resort, if it isn't possible for the server to store
+ * state at all, an instance of {@link Auth_OpenID_DumbStore} can be used.
+ *
+ * @param bool $immediate This is an optional boolean value. It
+ * controls whether the library uses immediate mode, as explained
+ * in the module description. The default value is False, which
+ * disables immediate mode.
+ */
+ function Auth_OpenID_GenericConsumer($store)
+ {
+ $this->store = $store;
+ $this->negotiator = Auth_OpenID_getDefaultNegotiator();
+ $this->_use_assocs = (is_null($this->store) ? false : true);
+
+ $this->fetcher = Auth_Yadis_Yadis::getHTTPFetcher();
+
+ $this->session_types = Auth_OpenID_getAvailableSessionTypes();
+ }
+
+ /**
+ * Called to begin OpenID authentication using the specified
+ * {@link Auth_OpenID_ServiceEndpoint}.
+ *
+ * @access private
+ */
+ function begin($service_endpoint)
+ {
+ $assoc = $this->_getAssociation($service_endpoint);
+ $r = new Auth_OpenID_AuthRequest($service_endpoint, $assoc);
+ $r->return_to_args[$this->openid1_nonce_query_arg_name] =
+ Auth_OpenID_mkNonce();
+
+ if ($r->message->isOpenID1()) {
+ $r->return_to_args[$this->openid1_return_to_identifier_name] =
+ $r->endpoint->claimed_id;
+ }
+
+ return $r;
+ }
+
+ /**
+ * Given an {@link Auth_OpenID_Message}, {@link
+ * Auth_OpenID_ServiceEndpoint} and optional return_to URL,
+ * complete OpenID authentication.
+ *
+ * @access private
+ */
+ function complete($message, $endpoint, $return_to)
+ {
+ $mode = $message->getArg(Auth_OpenID_OPENID_NS, 'mode',
+ '<no mode set>');
+
+ $mode_methods = array(
+ 'cancel' => '_complete_cancel',
+ 'error' => '_complete_error',
+ 'setup_needed' => '_complete_setup_needed',
+ 'id_res' => '_complete_id_res',
+ );
+
+ $method = Auth_OpenID::arrayGet($mode_methods, $mode,
+ '_completeInvalid');
+
+ return call_user_func_array(array($this, $method),
+ array($message, $endpoint, $return_to));
+ }
+
+ /**
+ * @access private
+ */
+ function _completeInvalid($message, $endpoint, $unused)
+ {
+ $mode = $message->getArg(Auth_OpenID_OPENID_NS, 'mode',
+ '<No mode set>');
+
+ return new Auth_OpenID_FailureResponse($endpoint,
+ sprintf("Invalid openid.mode '%s'", $mode));
+ }
+
+ /**
+ * @access private
+ */
+ function _complete_cancel($message, $endpoint, $unused)
+ {
+ return new Auth_OpenID_CancelResponse($endpoint);
+ }
+
+ /**
+ * @access private
+ */
+ function _complete_error($message, $endpoint, $unused)
+ {
+ $error = $message->getArg(Auth_OpenID_OPENID_NS, 'error');
+ $contact = $message->getArg(Auth_OpenID_OPENID_NS, 'contact');
+ $reference = $message->getArg(Auth_OpenID_OPENID_NS, 'reference');
+
+ return new Auth_OpenID_FailureResponse($endpoint, $error,
+ $contact, $reference);
+ }
+
+ /**
+ * @access private
+ */
+ function _complete_setup_needed($message, $endpoint, $unused)
+ {
+ if (!$message->isOpenID2()) {
+ return $this->_completeInvalid($message, $endpoint);
+ }
+
+ $user_setup_url = $message->getArg(Auth_OpenID_OPENID2_NS,
+ 'user_setup_url');
+ return new Auth_OpenID_SetupNeededResponse($endpoint, $user_setup_url);
+ }
+
+ /**
+ * @access private
+ */
+ function _complete_id_res($message, $endpoint, $return_to)
+ {
+ $user_setup_url = $message->getArg(Auth_OpenID_OPENID1_NS,
+ 'user_setup_url');
+
+ if ($this->_checkSetupNeeded($message)) {
+ return new Auth_OpenID_SetupNeededResponse(
+ $endpoint, $user_setup_url);
+ } else {
+ return $this->_doIdRes($message, $endpoint, $return_to);
+ }
+ }
+
+ /**
+ * @access private
+ */
+ function _checkSetupNeeded($message)
+ {
+ // In OpenID 1, we check to see if this is a cancel from
+ // immediate mode by the presence of the user_setup_url
+ // parameter.
+ if ($message->isOpenID1()) {
+ $user_setup_url = $message->getArg(Auth_OpenID_OPENID1_NS,
+ 'user_setup_url');
+ if ($user_setup_url !== null) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * @access private
+ */
+ function _doIdRes($message, $endpoint, $return_to)
+ {
+ // Checks for presence of appropriate fields (and checks
+ // signed list fields)
+ $result = $this->_idResCheckForFields($message);
+
+ if (Auth_OpenID::isFailure($result)) {
+ return $result;
+ }
+
+ if (!$this->_checkReturnTo($message, $return_to)) {
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf("return_to does not match return URL. Expected %s, got %s",
+ $return_to,
+ $message->getArg(Auth_OpenID_OPENID_NS, 'return_to')));
+ }
+
+ // Verify discovery information:
+ $result = $this->_verifyDiscoveryResults($message, $endpoint);
+
+ if (Auth_OpenID::isFailure($result)) {
+ return $result;
+ }
+
+ $endpoint = $result;
+
+ $result = $this->_idResCheckSignature($message,
+ $endpoint->server_url);
+
+ if (Auth_OpenID::isFailure($result)) {
+ return $result;
+ }
+
+ $result = $this->_idResCheckNonce($message, $endpoint);
+
+ if (Auth_OpenID::isFailure($result)) {
+ return $result;
+ }
+
+ $signed_list_str = $message->getArg(Auth_OpenID_OPENID_NS, 'signed',
+ Auth_OpenID_NO_DEFAULT);
+ if (Auth_OpenID::isFailure($signed_list_str)) {
+ return $signed_list_str;
+ }
+ $signed_list = explode(',', $signed_list_str);
+
+ $signed_fields = Auth_OpenID::addPrefix($signed_list, "openid.");
+
+ return new Auth_OpenID_SuccessResponse($endpoint, $message,
+ $signed_fields);
+
+ }
+
+ /**
+ * @access private
+ */
+ function _checkReturnTo($message, $return_to)
+ {
+ // Check an OpenID message and its openid.return_to value
+ // against a return_to URL from an application. Return True
+ // on success, False on failure.
+
+ // Check the openid.return_to args against args in the
+ // original message.
+ $result = Auth_OpenID_GenericConsumer::_verifyReturnToArgs(
+ $message->toPostArgs());
+ if (Auth_OpenID::isFailure($result)) {
+ return false;
+ }
+
+ // Check the return_to base URL against the one in the
+ // message.
+ $msg_return_to = $message->getArg(Auth_OpenID_OPENID_NS,
+ 'return_to');
+ if (Auth_OpenID::isFailure($return_to)) {
+ // XXX log me
+ return false;
+ }
+
+ $return_to_parts = parse_url(Auth_OpenID_urinorm($return_to));
+ $msg_return_to_parts = parse_url(Auth_OpenID_urinorm($msg_return_to));
+
+ // If port is absent from both, add it so it's equal in the
+ // check below.
+ if ((!array_key_exists('port', $return_to_parts)) &&
+ (!array_key_exists('port', $msg_return_to_parts))) {
+ $return_to_parts['port'] = null;
+ $msg_return_to_parts['port'] = null;
+ }
+
+ // If path is absent from both, add it so it's equal in the
+ // check below.
+ if ((!array_key_exists('path', $return_to_parts)) &&
+ (!array_key_exists('path', $msg_return_to_parts))) {
+ $return_to_parts['path'] = null;
+ $msg_return_to_parts['path'] = null;
+ }
+
+ // The URL scheme, authority, and path MUST be the same
+ // between the two URLs.
+ foreach (array('scheme', 'host', 'port', 'path') as $component) {
+ // If the url component is absent in either URL, fail.
+ // There should always be a scheme, host, port, and path.
+ if (!array_key_exists($component, $return_to_parts)) {
+ return false;
+ }
+
+ if (!array_key_exists($component, $msg_return_to_parts)) {
+ return false;
+ }
+
+ if (Auth_OpenID::arrayGet($return_to_parts, $component) !==
+ Auth_OpenID::arrayGet($msg_return_to_parts, $component)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyReturnToArgs($query)
+ {
+ // Verify that the arguments in the return_to URL are present in this
+ // response.
+
+ $message = Auth_OpenID_Message::fromPostArgs($query);
+ $return_to = $message->getArg(Auth_OpenID_OPENID_NS, 'return_to');
+
+ if (Auth_OpenID::isFailure($return_to)) {
+ return $return_to;
+ }
+ // XXX: this should be checked by _idResCheckForFields
+ if (!$return_to) {
+ return new Auth_OpenID_FailureResponse(null,
+ "Response has no return_to");
+ }
+
+ $parsed_url = parse_url($return_to);
+
+ $q = array();
+ if (array_key_exists('query', $parsed_url)) {
+ $rt_query = $parsed_url['query'];
+ $q = Auth_OpenID::parse_str($rt_query);
+ }
+
+ foreach ($q as $rt_key => $rt_value) {
+ if (!array_key_exists($rt_key, $query)) {
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf("return_to parameter %s absent from query", $rt_key));
+ } else {
+ $value = $query[$rt_key];
+ if ($rt_value != $value) {
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf("parameter %s value %s does not match " .
+ "return_to value %s", $rt_key,
+ $value, $rt_value));
+ }
+ }
+ }
+
+ // Make sure all non-OpenID arguments in the response are also
+ // in the signed return_to.
+ $bare_args = $message->getArgs(Auth_OpenID_BARE_NS);
+ foreach ($bare_args as $key => $value) {
+ if (Auth_OpenID::arrayGet($q, $key) != $value) {
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf("Parameter %s = %s not in return_to URL",
+ $key, $value));
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * @access private
+ */
+ function _idResCheckSignature($message, $server_url)
+ {
+ $assoc_handle = $message->getArg(Auth_OpenID_OPENID_NS,
+ 'assoc_handle');
+ if (Auth_OpenID::isFailure($assoc_handle)) {
+ return $assoc_handle;
+ }
+
+ $assoc = $this->store->getAssociation($server_url, $assoc_handle);
+
+ if ($assoc) {
+ if ($assoc->getExpiresIn() <= 0) {
+ // XXX: It might be a good idea sometimes to re-start
+ // the authentication with a new association. Doing it
+ // automatically opens the possibility for
+ // denial-of-service by a server that just returns
+ // expired associations (or really short-lived
+ // associations)
+ return new Auth_OpenID_FailureResponse(null,
+ 'Association with ' . $server_url . ' expired');
+ }
+
+ if (!$assoc->checkMessageSignature($message)) {
+ // If we get a "bad signature" here, it means that the association
+ // is unrecoverabley corrupted in some way. Any futher attempts
+ // to login with this association is likely to fail. Drop it.
+ $this->store->removeAssociation($server_url, $assoc_handle);
+ return new Auth_OpenID_FailureResponse(null,
+ "Bad signature");
+ }
+ } else {
+ // It's not an association we know about. Stateless mode
+ // is our only possible path for recovery. XXX - async
+ // framework will not want to block on this call to
+ // _checkAuth.
+ if (!$this->_checkAuth($message, $server_url)) {
+ return new Auth_OpenID_FailureResponse(null,
+ "Server denied check_authentication");
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyDiscoveryResults($message, $endpoint=null)
+ {
+ if ($message->getOpenIDNamespace() == Auth_OpenID_OPENID2_NS) {
+ return $this->_verifyDiscoveryResultsOpenID2($message,
+ $endpoint);
+ } else {
+ return $this->_verifyDiscoveryResultsOpenID1($message,
+ $endpoint);
+ }
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyDiscoveryResultsOpenID1($message, $endpoint)
+ {
+ $claimed_id = $message->getArg(Auth_OpenID_BARE_NS,
+ $this->openid1_return_to_identifier_name);
+
+ if (($endpoint === null) && ($claimed_id === null)) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ 'When using OpenID 1, the claimed ID must be supplied, ' .
+ 'either by passing it through as a return_to parameter ' .
+ 'or by using a session, and supplied to the GenericConsumer ' .
+ 'as the argument to complete()');
+ } else if (($endpoint !== null) && ($claimed_id === null)) {
+ $claimed_id = $endpoint->claimed_id;
+ }
+
+ $to_match = new Auth_OpenID_ServiceEndpoint();
+ $to_match->type_uris = array(Auth_OpenID_TYPE_1_1);
+ $to_match->local_id = $message->getArg(Auth_OpenID_OPENID1_NS,
+ 'identity');
+
+ // Restore delegate information from the initiation phase
+ $to_match->claimed_id = $claimed_id;
+
+ if ($to_match->local_id === null) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "Missing required field openid.identity");
+ }
+
+ $to_match_1_0 = $to_match->copy();
+ $to_match_1_0->type_uris = array(Auth_OpenID_TYPE_1_0);
+
+ if ($endpoint !== null) {
+ $result = $this->_verifyDiscoverySingle($endpoint, $to_match);
+
+ if (is_a($result, 'Auth_OpenID_TypeURIMismatch')) {
+ $result = $this->_verifyDiscoverySingle($endpoint,
+ $to_match_1_0);
+ }
+
+ if (Auth_OpenID::isFailure($result)) {
+ // oidutil.log("Error attempting to use stored
+ // discovery information: " + str(e))
+ // oidutil.log("Attempting discovery to
+ // verify endpoint")
+ } else {
+ return $endpoint;
+ }
+ }
+
+ // Endpoint is either bad (failed verification) or None
+ return $this->_discoverAndVerify($to_match->claimed_id,
+ array($to_match, $to_match_1_0));
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyDiscoverySingle($endpoint, $to_match)
+ {
+ // Every type URI that's in the to_match endpoint has to be
+ // present in the discovered endpoint.
+ foreach ($to_match->type_uris as $type_uri) {
+ if (!$endpoint->usesExtension($type_uri)) {
+ return new Auth_OpenID_TypeURIMismatch($endpoint,
+ "Required type ".$type_uri." not present");
+ }
+ }
+
+ // Fragments do not influence discovery, so we can't compare a
+ // claimed identifier with a fragment to discovered
+ // information.
+ list($defragged_claimed_id, $_) =
+ Auth_OpenID::urldefrag($to_match->claimed_id);
+
+ if ($defragged_claimed_id != $endpoint->claimed_id) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ sprintf('Claimed ID does not match (different subjects!), ' .
+ 'Expected %s, got %s', $defragged_claimed_id,
+ $endpoint->claimed_id));
+ }
+
+ if ($to_match->getLocalID() != $endpoint->getLocalID()) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ sprintf('local_id mismatch. Expected %s, got %s',
+ $to_match->getLocalID(), $endpoint->getLocalID()));
+ }
+
+ // If the server URL is None, this must be an OpenID 1
+ // response, because op_endpoint is a required parameter in
+ // OpenID 2. In that case, we don't actually care what the
+ // discovered server_url is, because signature checking or
+ // check_auth should take care of that check for us.
+ if ($to_match->server_url === null) {
+ if ($to_match->preferredNamespace() != Auth_OpenID_OPENID1_NS) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "Preferred namespace mismatch (bug)");
+ }
+ } else if ($to_match->server_url != $endpoint->server_url) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ sprintf('OP Endpoint mismatch. Expected %s, got %s',
+ $to_match->server_url, $endpoint->server_url));
+ }
+
+ return null;
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyDiscoveryResultsOpenID2($message, $endpoint)
+ {
+ $to_match = new Auth_OpenID_ServiceEndpoint();
+ $to_match->type_uris = array(Auth_OpenID_TYPE_2_0);
+ $to_match->claimed_id = $message->getArg(Auth_OpenID_OPENID2_NS,
+ 'claimed_id');
+
+ $to_match->local_id = $message->getArg(Auth_OpenID_OPENID2_NS,
+ 'identity');
+
+ $to_match->server_url = $message->getArg(Auth_OpenID_OPENID2_NS,
+ 'op_endpoint');
+
+ if ($to_match->server_url === null) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "OP Endpoint URL missing");
+ }
+
+ // claimed_id and identifier must both be present or both be
+ // absent
+ if (($to_match->claimed_id === null) &&
+ ($to_match->local_id !== null)) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ 'openid.identity is present without openid.claimed_id');
+ }
+
+ if (($to_match->claimed_id !== null) &&
+ ($to_match->local_id === null)) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ 'openid.claimed_id is present without openid.identity');
+ }
+
+ if ($to_match->claimed_id === null) {
+ // This is a response without identifiers, so there's
+ // really no checking that we can do, so return an
+ // endpoint that's for the specified `openid.op_endpoint'
+ return Auth_OpenID_ServiceEndpoint::fromOPEndpointURL(
+ $to_match->server_url);
+ }
+
+ if (!$endpoint) {
+ // The claimed ID doesn't match, so we have to do
+ // discovery again. This covers not using sessions, OP
+ // identifier endpoints and responses that didn't match
+ // the original request.
+ // oidutil.log('No pre-discovered information supplied.')
+ return $this->_discoverAndVerify($to_match->claimed_id,
+ array($to_match));
+ } else {
+
+ // The claimed ID matches, so we use the endpoint that we
+ // discovered in initiation. This should be the most
+ // common case.
+ $result = $this->_verifyDiscoverySingle($endpoint, $to_match);
+
+ if (Auth_OpenID::isFailure($result)) {
+ $endpoint = $this->_discoverAndVerify($to_match->claimed_id,
+ array($to_match));
+ if (Auth_OpenID::isFailure($endpoint)) {
+ return $endpoint;
+ }
+ }
+ }
+
+ // The endpoint we return should have the claimed ID from the
+ // message we just verified, fragment and all.
+ if ($endpoint->claimed_id != $to_match->claimed_id) {
+ $endpoint->claimed_id = $to_match->claimed_id;
+ }
+
+ return $endpoint;
+ }
+
+ /**
+ * @access private
+ */
+ function _discoverAndVerify($claimed_id, $to_match_endpoints)
+ {
+ // oidutil.log('Performing discovery on %s' % (claimed_id,))
+ list($unused, $services) = call_user_func($this->discoverMethod,
+ $claimed_id,
+ $this->fetcher);
+
+ if (!$services) {
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf("No OpenID information found at %s",
+ $claimed_id));
+ }
+
+ return $this->_verifyDiscoveryServices($claimed_id, $services,
+ $to_match_endpoints);
+ }
+
+ /**
+ * @access private
+ */
+ function _verifyDiscoveryServices($claimed_id,
+ $services, $to_match_endpoints)
+ {
+ // Search the services resulting from discovery to find one
+ // that matches the information from the assertion
+
+ foreach ($services as $endpoint) {
+ foreach ($to_match_endpoints as $to_match_endpoint) {
+ $result = $this->_verifyDiscoverySingle($endpoint,
+ $to_match_endpoint);
+
+ if (!Auth_OpenID::isFailure($result)) {
+ // It matches, so discover verification has
+ // succeeded. Return this endpoint.
+ return $endpoint;
+ }
+ }
+ }
+
+ return new Auth_OpenID_FailureResponse(null,
+ sprintf('No matching endpoint found after discovering %s: %s',
+ $claimed_id, $result->message));
+ }
+
+ /**
+ * Extract the nonce from an OpenID 1 response. Return the nonce
+ * from the BARE_NS since we independently check the return_to
+ * arguments are the same as those in the response message.
+ *
+ * See the openid1_nonce_query_arg_name class variable
+ *
+ * @returns $nonce The nonce as a string or null
+ *
+ * @access private
+ */
+ function _idResGetNonceOpenID1($message, $endpoint)
+ {
+ return $message->getArg(Auth_OpenID_BARE_NS,
+ $this->openid1_nonce_query_arg_name);
+ }
+
+ /**
+ * @access private
+ */
+ function _idResCheckNonce($message, $endpoint)
+ {
+ if ($message->isOpenID1()) {
+ // This indicates that the nonce was generated by the consumer
+ $nonce = $this->_idResGetNonceOpenID1($message, $endpoint);
+ $server_url = '';
+ } else {
+ $nonce = $message->getArg(Auth_OpenID_OPENID2_NS,
+ 'response_nonce');
+
+ $server_url = $endpoint->server_url;
+ }
+
+ if ($nonce === null) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "Nonce missing from response");
+ }
+
+ $parts = Auth_OpenID_splitNonce($nonce);
+
+ if ($parts === null) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "Malformed nonce in response");
+ }
+
+ list($timestamp, $salt) = $parts;
+
+ if (!$this->store->useNonce($server_url, $timestamp, $salt)) {
+ return new Auth_OpenID_FailureResponse($endpoint,
+ "Nonce already used or out of range");
+ }
+
+ return null;
+ }
+
+ /**
+ * @access private
+ */
+ function _idResCheckForFields($message)
+ {
+ $basic_fields = array('return_to', 'assoc_handle', 'sig', 'signed');
+ $basic_sig_fields = array('return_to', 'identity');
+
+ $require_fields = array(
+ Auth_OpenID_OPENID2_NS => array_merge($basic_fields,
+ array('op_endpoint')),
+
+ Auth_OpenID_OPENID1_NS => array_merge($basic_fields,
+ array('identity'))
+ );
+
+ $require_sigs = array(
+ Auth_OpenID_OPENID2_NS => array_merge($basic_sig_fields,
+ array('response_nonce',
+ 'claimed_id',
+ 'assoc_handle',
+ 'op_endpoint')),
+ Auth_OpenID_OPENID1_NS => array_merge($basic_sig_fields,
+ array('nonce'))
+ );
+
+ foreach ($require_fields[$message->getOpenIDNamespace()] as $field) {
+ if (!$message->hasKey(Auth_OpenID_OPENID_NS, $field)) {
+ return new Auth_OpenID_FailureResponse(null,
+ "Missing required field '".$field."'");
+ }
+ }
+
+ $signed_list_str = $message->getArg(Auth_OpenID_OPENID_NS,
+ 'signed',
+ Auth_OpenID_NO_DEFAULT);
+ if (Auth_OpenID::isFailure($signed_list_str)) {
+ return $signed_list_str;
+ }
+ $signed_list = explode(',', $signed_list_str);
+
+ foreach ($require_sigs[$message->getOpenIDNamespace()] as $field) {
+ // Field is present and not in signed list
+ if ($message->hasKey(Auth_OpenID_OPENID_NS, $field) &&
+ (!in_array($field, $signed_list))) {
+ return new Auth_OpenID_FailureResponse(null,
+ "'".$field."' not signed");
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * @access private
+ */
+ function _checkAuth($message, $server_url)
+ {
+ $request = $this->_createCheckAuthRequest($message);
+ if ($request === null) {
+ return false;
+ }
+
+ $resp_message = $this->_makeKVPost($request, $server_url);
+ if (($resp_message === null) ||
+ (is_a($resp_message, 'Auth_OpenID_ServerErrorContainer'))) {
+ return false;
+ }
+
+ return $this->_processCheckAuthResponse($resp_message, $server_url);
+ }
+
+ /**
+ * @access private
+ */
+ function _createCheckAuthRequest($message)
+ {
+ $signed = $message->getArg(Auth_OpenID_OPENID_NS, 'signed');
+ if ($signed) {
+ foreach (explode(',', $signed) as $k) {
+ $value = $message->getAliasedArg($k);
+ if ($value === null) {
+ return null;
+ }
+ }
+ }
+ $ca_message = $message->copy();
+ $ca_message->setArg(Auth_OpenID_OPENID_NS, 'mode',
+ 'check_authentication');
+ return $ca_message;
+ }
+
+ /**
+ * @access private
+ */
+ function _processCheckAuthResponse($response, $server_url)
+ {
+ $is_valid = $response->getArg(Auth_OpenID_OPENID_NS, 'is_valid',
+ 'false');
+
+ $invalidate_handle = $response->getArg(Auth_OpenID_OPENID_NS,
+ 'invalidate_handle');
+
+ if ($invalidate_handle !== null) {
+ $this->store->removeAssociation($server_url,
+ $invalidate_handle);
+ }
+
+ if ($is_valid == 'true') {
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Adapt a POST response to a Message.
+ *
+ * @param $response Result of a POST to an OpenID endpoint.
+ *
+ * @access private
+ */
+ static function _httpResponseToMessage($response, $server_url)
+ {
+ // Should this function be named Message.fromHTTPResponse instead?
+ $response_message = Auth_OpenID_Message::fromKVForm($response->body);
+
+ if ($response->status == 400) {
+ return Auth_OpenID_ServerErrorContainer::fromMessage(
+ $response_message);
+ } else if ($response->status != 200 and $response->status != 206) {
+ return null;
+ }
+
+ return $response_message;
+ }
+
+ /**
+ * @access private
+ */
+ function _makeKVPost($message, $server_url)
+ {
+ $body = $message->toURLEncoded();
+ $resp = $this->fetcher->post($server_url, $body);
+
+ if ($resp === null) {
+ return null;
+ }
+
+ return $this->_httpResponseToMessage($resp, $server_url);
+ }
+
+ /**
+ * @access private
+ */
+ function _getAssociation($endpoint)
+ {
+ if (!$this->_use_assocs) {
+ return null;
+ }
+
+ $assoc = $this->store->getAssociation($endpoint->server_url);
+
+ if (($assoc === null) ||
+ ($assoc->getExpiresIn() <= 0)) {
+
+ $assoc = $this->_negotiateAssociation($endpoint);
+
+ if ($assoc !== null) {
+ $this->store->storeAssociation($endpoint->server_url,
+ $assoc);
+ }
+ }
+
+ return $assoc;
+ }
+
+ /**
+ * Handle ServerErrors resulting from association requests.
+ *
+ * @return $result If server replied with an C{unsupported-type}
+ * error, return a tuple of supported C{association_type},
+ * C{session_type}. Otherwise logs the error and returns null.
+ *
+ * @access private
+ */
+ function _extractSupportedAssociationType($server_error, $endpoint,
+ $assoc_type)
+ {
+ // Any error message whose code is not 'unsupported-type'
+ // should be considered a total failure.
+ if (($server_error->error_code != 'unsupported-type') ||
+ ($server_error->message->isOpenID1())) {
+ return null;
+ }
+
+ // The server didn't like the association/session type that we
+ // sent, and it sent us back a message that might tell us how
+ // to handle it.
+
+ // Extract the session_type and assoc_type from the error
+ // message
+ $assoc_type = $server_error->message->getArg(Auth_OpenID_OPENID_NS,
+ 'assoc_type');
+
+ $session_type = $server_error->message->getArg(Auth_OpenID_OPENID_NS,
+ 'session_type');
+
+ if (($assoc_type === null) || ($session_type === null)) {
+ return null;
+ } else if (!$this->negotiator->isAllowed($assoc_type,
+ $session_type)) {
+ return null;
+ } else {
+ return array($assoc_type, $session_type);
+ }
+ }
+
+ /**
+ * @access private
+ */
+ function _negotiateAssociation($endpoint)
+ {
+ // Get our preferred session/association type from the negotiatior.
+ list($assoc_type, $session_type) = $this->negotiator->getAllowedType();
+
+ $assoc = $this->_requestAssociation(
+ $endpoint, $assoc_type, $session_type);
+
+ if (Auth_OpenID::isFailure($assoc)) {
+ return null;
+ }
+
+ if (is_a($assoc, 'Auth_OpenID_ServerErrorContainer')) {
+ $why = $assoc;
+
+ $supportedTypes = $this->_extractSupportedAssociationType(
+ $why, $endpoint, $assoc_type);
+
+ if ($supportedTypes !== null) {
+ list($assoc_type, $session_type) = $supportedTypes;
+
+ // Attempt to create an association from the assoc_type
+ // and session_type that the server told us it
+ // supported.
+ $assoc = $this->_requestAssociation(
+ $endpoint, $assoc_type, $session_type);
+
+ if (is_a($assoc, 'Auth_OpenID_ServerErrorContainer')) {
+ // Do not keep trying, since it rejected the
+ // association type that it told us to use.
+ // oidutil.log('Server %s refused its suggested association
+ // 'type: session_type=%s, assoc_type=%s'
+ // % (endpoint.server_url, session_type,
+ // assoc_type))
+ return null;
+ } else {
+ return $assoc;
+ }
+ } else {
+ return null;
+ }
+ } else {
+ return $assoc;
+ }
+ }
+
+ /**
+ * @access private
+ */
+ function _requestAssociation($endpoint, $assoc_type, $session_type)
+ {
+ list($assoc_session, $args) = $this->_createAssociateRequest(
+ $endpoint, $assoc_type, $session_type);
+
+ $response_message = $this->_makeKVPost($args, $endpoint->server_url);
+
+ if ($response_message === null) {
+ // oidutil.log('openid.associate request failed: %s' % (why[0],))
+ return null;
+ } else if (is_a($response_message,
+ 'Auth_OpenID_ServerErrorContainer')) {
+ return $response_message;
+ }
+
+ return $this->_extractAssociation($response_message, $assoc_session);
+ }
+
+ /**
+ * @access private
+ */
+ function _extractAssociation($assoc_response, $assoc_session)
+ {
+ // Extract the common fields from the response, raising an
+ // exception if they are not found
+ $assoc_type = $assoc_response->getArg(
+ Auth_OpenID_OPENID_NS, 'assoc_type',
+ Auth_OpenID_NO_DEFAULT);
+
+ if (Auth_OpenID::isFailure($assoc_type)) {
+ return $assoc_type;
+ }
+
+ $assoc_handle = $assoc_response->getArg(
+ Auth_OpenID_OPENID_NS, 'assoc_handle',
+ Auth_OpenID_NO_DEFAULT);
+
+ if (Auth_OpenID::isFailure($assoc_handle)) {
+ return $assoc_handle;
+ }
+
+ // expires_in is a base-10 string. The Python parsing will
+ // accept literals that have whitespace around them and will
+ // accept negative values. Neither of these are really in-spec,
+ // but we think it's OK to accept them.
+ $expires_in_str = $assoc_response->getArg(
+ Auth_OpenID_OPENID_NS, 'expires_in',
+ Auth_OpenID_NO_DEFAULT);
+
+ if (Auth_OpenID::isFailure($expires_in_str)) {
+ return $expires_in_str;
+ }
+
+ $expires_in = Auth_OpenID::intval($expires_in_str);
+ if ($expires_in === false) {
+
+ $err = sprintf("Could not parse expires_in from association ".
+ "response %s", print_r($assoc_response, true));
+ return new Auth_OpenID_FailureResponse(null, $err);
+ }
+
+ // OpenID 1 has funny association session behaviour.
+ if ($assoc_response->isOpenID1()) {
+ $session_type = $this->_getOpenID1SessionType($assoc_response);
+ } else {
+ $session_type = $assoc_response->getArg(
+ Auth_OpenID_OPENID2_NS, 'session_type',
+ Auth_OpenID_NO_DEFAULT);
+
+ if (Auth_OpenID::isFailure($session_type)) {
+ return $session_type;
+ }
+ }
+
+ // Session type mismatch
+ if ($assoc_session->session_type != $session_type) {
+ if ($assoc_response->isOpenID1() &&
+ ($session_type == 'no-encryption')) {
+ // In OpenID 1, any association request can result in
+ // a 'no-encryption' association response. Setting
+ // assoc_session to a new no-encryption session should
+ // make the rest of this function work properly for
+ // that case.
+ $assoc_session = new Auth_OpenID_PlainTextConsumerSession();
+ } else {
+ // Any other mismatch, regardless of protocol version
+ // results in the failure of the association session
+ // altogether.
+ return null;
+ }
+ }
+
+ // Make sure assoc_type is valid for session_type
+ if (!in_array($assoc_type, $assoc_session->allowed_assoc_types)) {
+ return null;
+ }
+
+ // Delegate to the association session to extract the secret
+ // from the response, however is appropriate for that session
+ // type.
+ $secret = $assoc_session->extractSecret($assoc_response);
+
+ if ($secret === null) {
+ return null;
+ }
+
+ return Auth_OpenID_Association::fromExpiresIn(
+ $expires_in, $assoc_handle, $secret, $assoc_type);
+ }
+
+ /**
+ * @access private
+ */
+ function _createAssociateRequest($endpoint, $assoc_type, $session_type)
+ {
+ if (array_key_exists($session_type, $this->session_types)) {
+ $session_type_class = $this->session_types[$session_type];
+
+ if (is_callable($session_type_class)) {
+ $assoc_session = $session_type_class();
+ } else {
+ $assoc_session = new $session_type_class();
+ }
+ } else {
+ return null;
+ }
+
+ $args = array(
+ 'mode' => 'associate',
+ 'assoc_type' => $assoc_type);
+
+ if (!$endpoint->compatibilityMode()) {
+ $args['ns'] = Auth_OpenID_OPENID2_NS;
+ }
+
+ // Leave out the session type if we're in compatibility mode
+ // *and* it's no-encryption.
+ if ((!$endpoint->compatibilityMode()) ||
+ ($assoc_session->session_type != 'no-encryption')) {
+ $args['session_type'] = $assoc_session->session_type;
+ }
+
+ $args = array_merge($args, $assoc_session->getRequest());
+ $message = Auth_OpenID_Message::fromOpenIDArgs($args);
+ return array($assoc_session, $message);
+ }
+
+ /**
+ * Given an association response message, extract the OpenID 1.X
+ * session type.
+ *
+ * This function mostly takes care of the 'no-encryption' default
+ * behavior in OpenID 1.
+ *
+ * If the association type is plain-text, this function will
+ * return 'no-encryption'
+ *
+ * @access private
+ * @return $typ The association type for this message
+ */
+ function _getOpenID1SessionType($assoc_response)
+ {
+ // If it's an OpenID 1 message, allow session_type to default
+ // to None (which signifies "no-encryption")
+ $session_type = $assoc_response->getArg(Auth_OpenID_OPENID1_NS,
+ 'session_type');
+
+ // Handle the differences between no-encryption association
+ // respones in OpenID 1 and 2:
+
+ // no-encryption is not really a valid session type for OpenID
+ // 1, but we'll accept it anyway, while issuing a warning.
+ if ($session_type == 'no-encryption') {
+ // oidutil.log('WARNING: OpenID server sent "no-encryption"'
+ // 'for OpenID 1.X')
+ } else if (($session_type == '') || ($session_type === null)) {
+ // Missing or empty session type is the way to flag a
+ // 'no-encryption' response. Change the session type to
+ // 'no-encryption' so that it can be handled in the same
+ // way as OpenID 2 'no-encryption' respones.
+ $session_type = 'no-encryption';
+ }
+
+ return $session_type;
+ }
+}
+
+/**
+ * This class represents an authentication request from a consumer to
+ * an OpenID server.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_AuthRequest {
+
+ /**
+ * Initialize an authentication request with the specified token,
+ * association, and endpoint.
+ *
+ * Users of this library should not create instances of this
+ * class. Instances of this class are created by the library when
+ * needed.
+ */
+ function Auth_OpenID_AuthRequest($endpoint, $assoc)
+ {
+ $this->assoc = $assoc;
+ $this->endpoint = $endpoint;
+ $this->return_to_args = array();
+ $this->message = new Auth_OpenID_Message(
+ $endpoint->preferredNamespace());
+ $this->_anonymous = false;
+ }
+
+ /**
+ * Add an extension to this checkid request.
+ *
+ * $extension_request: An object that implements the extension
+ * request interface for adding arguments to an OpenID message.
+ */
+ function addExtension($extension_request)
+ {
+ $extension_request->toMessage($this->message);
+ }
+
+ /**
+ * Add an extension argument to this OpenID authentication
+ * request.
+ *
+ * Use caution when adding arguments, because they will be
+ * URL-escaped and appended to the redirect URL, which can easily
+ * get quite long.
+ *
+ * @param string $namespace The namespace for the extension. For
+ * example, the simple registration extension uses the namespace
+ * 'sreg'.
+ *
+ * @param string $key The key within the extension namespace. For
+ * example, the nickname field in the simple registration
+ * extension's key is 'nickname'.
+ *
+ * @param string $value The value to provide to the server for
+ * this argument.
+ */
+ function addExtensionArg($namespace, $key, $value)
+ {
+ return $this->message->setArg($namespace, $key, $value);
+ }
+
+ /**
+ * Set whether this request should be made anonymously. If a
+ * request is anonymous, the identifier will not be sent in the
+ * request. This is only useful if you are making another kind of
+ * request with an extension in this request.
+ *
+ * Anonymous requests are not allowed when the request is made
+ * with OpenID 1.
+ */
+ function setAnonymous($is_anonymous)
+ {
+ if ($is_anonymous && $this->message->isOpenID1()) {
+ return false;
+ } else {
+ $this->_anonymous = $is_anonymous;
+ return true;
+ }
+ }
+
+ /**
+ * Produce a {@link Auth_OpenID_Message} representing this
+ * request.
+ *
+ * @param string $realm The URL (or URL pattern) that identifies
+ * your web site to the user when she is authorizing it.
+ *
+ * @param string $return_to The URL that the OpenID provider will
+ * send the user back to after attempting to verify her identity.
+ *
+ * Not specifying a return_to URL means that the user will not be
+ * returned to the site issuing the request upon its completion.
+ *
+ * @param bool $immediate If true, the OpenID provider is to send
+ * back a response immediately, useful for behind-the-scenes
+ * authentication attempts. Otherwise the OpenID provider may
+ * engage the user before providing a response. This is the
+ * default case, as the user may need to provide credentials or
+ * approve the request before a positive response can be sent.
+ */
+ function getMessage($realm, $return_to=null, $immediate=false)
+ {
+ if ($return_to) {
+ $return_to = Auth_OpenID::appendArgs($return_to,
+ $this->return_to_args);
+ } else if ($immediate) {
+ // raise ValueError(
+ // '"return_to" is mandatory when
+ //using "checkid_immediate"')
+ return new Auth_OpenID_FailureResponse(null,
+ "'return_to' is mandatory when using checkid_immediate");
+ } else if ($this->message->isOpenID1()) {
+ // raise ValueError('"return_to" is
+ // mandatory for OpenID 1 requests')
+ return new Auth_OpenID_FailureResponse(null,
+ "'return_to' is mandatory for OpenID 1 requests");
+ } else if ($this->return_to_args) {
+ // raise ValueError('extra "return_to" arguments
+ // were specified, but no return_to was specified')
+ return new Auth_OpenID_FailureResponse(null,
+ "extra 'return_to' arguments where specified, " .
+ "but no return_to was specified");
+ }
+
+ if ($immediate) {
+ $mode = 'checkid_immediate';
+ } else {
+ $mode = 'checkid_setup';
+ }
+
+ $message = $this->message->copy();
+ if ($message->isOpenID1()) {
+ $realm_key = 'trust_root';
+ } else {
+ $realm_key = 'realm';
+ }
+
+ $message->updateArgs(Auth_OpenID_OPENID_NS,
+ array(
+ $realm_key => $realm,
+ 'mode' => $mode,
+ 'return_to' => $return_to));
+
+ if (!$this->_anonymous) {
+ if ($this->endpoint->isOPIdentifier()) {
+ // This will never happen when we're in compatibility
+ // mode, as long as isOPIdentifier() returns False
+ // whenever preferredNamespace() returns OPENID1_NS.
+ $claimed_id = $request_identity =
+ Auth_OpenID_IDENTIFIER_SELECT;
+ } else {
+ $request_identity = $this->endpoint->getLocalID();
+ $claimed_id = $this->endpoint->claimed_id;
+ }
+
+ // This is true for both OpenID 1 and 2
+ $message->setArg(Auth_OpenID_OPENID_NS, 'identity',
+ $request_identity);
+
+ if ($message->isOpenID2()) {
+ $message->setArg(Auth_OpenID_OPENID2_NS, 'claimed_id',
+ $claimed_id);
+ }
+ }
+
+ if ($this->assoc) {
+ $message->setArg(Auth_OpenID_OPENID_NS, 'assoc_handle',
+ $this->assoc->handle);
+ }
+
+ return $message;
+ }
+
+ function redirectURL($realm, $return_to = null,
+ $immediate = false)
+ {
+ $message = $this->getMessage($realm, $return_to, $immediate);
+
+ if (Auth_OpenID::isFailure($message)) {
+ return $message;
+ }
+
+ return $message->toURL($this->endpoint->server_url);
+ }
+
+ /**
+ * Get html for a form to submit this request to the IDP.
+ *
+ * form_tag_attrs: An array of attributes to be added to the form
+ * tag. 'accept-charset' and 'enctype' have defaults that can be
+ * overridden. If a value is supplied for 'action' or 'method', it
+ * will be replaced.
+ */
+ function formMarkup($realm, $return_to=null, $immediate=false,
+ $form_tag_attrs=null)
+ {
+ $message = $this->getMessage($realm, $return_to, $immediate);
+
+ if (Auth_OpenID::isFailure($message)) {
+ return $message;
+ }
+
+ return $message->toFormMarkup($this->endpoint->server_url,
+ $form_tag_attrs);
+ }
+
+ /**
+ * Get a complete html document that will autosubmit the request
+ * to the IDP.
+ *
+ * Wraps formMarkup. See the documentation for that function.
+ */
+ function htmlMarkup($realm, $return_to=null, $immediate=false,
+ $form_tag_attrs=null)
+ {
+ $form = $this->formMarkup($realm, $return_to, $immediate,
+ $form_tag_attrs);
+
+ if (Auth_OpenID::isFailure($form)) {
+ return $form;
+ }
+ return Auth_OpenID::autoSubmitHTML($form);
+ }
+
+ function shouldSendRedirect()
+ {
+ return $this->endpoint->compatibilityMode();
+ }
+}
+
+/**
+ * The base class for responses from the Auth_OpenID_Consumer.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_ConsumerResponse {
+ var $status = null;
+
+ function setEndpoint($endpoint)
+ {
+ $this->endpoint = $endpoint;
+ if ($endpoint === null) {
+ $this->identity_url = null;
+ } else {
+ $this->identity_url = $endpoint->claimed_id;
+ }
+ }
+
+ /**
+ * Return the display identifier for this response.
+ *
+ * The display identifier is related to the Claimed Identifier, but the
+ * two are not always identical. The display identifier is something the
+ * user should recognize as what they entered, whereas the response's
+ * claimed identifier (in the identity_url attribute) may have extra
+ * information for better persistence.
+ *
+ * URLs will be stripped of their fragments for display. XRIs will
+ * display the human-readable identifier (i-name) instead of the
+ * persistent identifier (i-number).
+ *
+ * Use the display identifier in your user interface. Use
+ * identity_url for querying your database or authorization server.
+ *
+ */
+ function getDisplayIdentifier()
+ {
+ if ($this->endpoint !== null) {
+ return $this->endpoint->getDisplayIdentifier();
+ }
+ return null;
+ }
+}
+
+/**
+ * A response with a status of Auth_OpenID_SUCCESS. Indicates that
+ * this request is a successful acknowledgement from the OpenID server
+ * that the supplied URL is, indeed controlled by the requesting
+ * agent. This has three relevant attributes:
+ *
+ * claimed_id - The identity URL that has been authenticated
+ *
+ * signed_args - The arguments in the server's response that were
+ * signed and verified.
+ *
+ * status - Auth_OpenID_SUCCESS.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_SuccessResponse extends Auth_OpenID_ConsumerResponse {
+ var $status = Auth_OpenID_SUCCESS;
+
+ /**
+ * @access private
+ */
+ function Auth_OpenID_SuccessResponse($endpoint, $message, $signed_args=null)
+ {
+ $this->endpoint = $endpoint;
+ $this->identity_url = $endpoint->claimed_id;
+ $this->signed_args = $signed_args;
+ $this->message = $message;
+
+ if ($this->signed_args === null) {
+ $this->signed_args = array();
+ }
+ }
+
+ /**
+ * Extract signed extension data from the server's response.
+ *
+ * @param string $prefix The extension namespace from which to
+ * extract the extension data.
+ */
+ function extensionResponse($namespace_uri, $require_signed)
+ {
+ if ($require_signed) {
+ return $this->getSignedNS($namespace_uri);
+ } else {
+ return $this->message->getArgs($namespace_uri);
+ }
+ }
+
+ function isOpenID1()
+ {
+ return $this->message->isOpenID1();
+ }
+
+ function isSigned($ns_uri, $ns_key)
+ {
+ // Return whether a particular key is signed, regardless of
+ // its namespace alias
+ return in_array($this->message->getKey($ns_uri, $ns_key),
+ $this->signed_args);
+ }
+
+ function getSigned($ns_uri, $ns_key, $default = null)
+ {
+ // Return the specified signed field if available, otherwise
+ // return default
+ if ($this->isSigned($ns_uri, $ns_key)) {
+ return $this->message->getArg($ns_uri, $ns_key, $default);
+ } else {
+ return $default;
+ }
+ }
+
+ function getSignedNS($ns_uri)
+ {
+ $args = array();
+
+ $msg_args = $this->message->getArgs($ns_uri);
+ if (Auth_OpenID::isFailure($msg_args)) {
+ return null;
+ }
+
+ foreach ($msg_args as $key => $value) {
+ if (!$this->isSigned($ns_uri, $key)) {
+ unset($msg_args[$key]);
+ }
+ }
+
+ return $msg_args;
+ }
+
+ /**
+ * Get the openid.return_to argument from this response.
+ *
+ * This is useful for verifying that this request was initiated by
+ * this consumer.
+ *
+ * @return string $return_to The return_to URL supplied to the
+ * server on the initial request, or null if the response did not
+ * contain an 'openid.return_to' argument.
+ */
+ function getReturnTo()
+ {
+ return $this->getSigned(Auth_OpenID_OPENID_NS, 'return_to');
+ }
+}
+
+/**
+ * A response with a status of Auth_OpenID_FAILURE. Indicates that the
+ * OpenID protocol has failed. This could be locally or remotely
+ * triggered. This has three relevant attributes:
+ *
+ * claimed_id - The identity URL for which authentication was
+ * attempted, if it can be determined. Otherwise, null.
+ *
+ * message - A message indicating why the request failed, if one is
+ * supplied. Otherwise, null.
+ *
+ * status - Auth_OpenID_FAILURE.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_FailureResponse extends Auth_OpenID_ConsumerResponse {
+ var $status = Auth_OpenID_FAILURE;
+
+ function Auth_OpenID_FailureResponse($endpoint, $message = null,
+ $contact = null, $reference = null)
+ {
+ $this->setEndpoint($endpoint);
+ $this->message = $message;
+ $this->contact = $contact;
+ $this->reference = $reference;
+ }
+}
+
+/**
+ * A specific, internal failure used to detect type URI mismatch.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_TypeURIMismatch extends Auth_OpenID_FailureResponse {
+}
+
+/**
+ * Exception that is raised when the server returns a 400 response
+ * code to a direct request.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_ServerErrorContainer {
+ function Auth_OpenID_ServerErrorContainer($error_text,
+ $error_code,
+ $message)
+ {
+ $this->error_text = $error_text;
+ $this->error_code = $error_code;
+ $this->message = $message;
+ }
+
+ /**
+ * @access private
+ */
+ static function fromMessage($message)
+ {
+ $error_text = $message->getArg(
+ Auth_OpenID_OPENID_NS, 'error', '<no error message supplied>');
+ $error_code = $message->getArg(Auth_OpenID_OPENID_NS, 'error_code');
+ return new Auth_OpenID_ServerErrorContainer($error_text,
+ $error_code,
+ $message);
+ }
+}
+
+/**
+ * A response with a status of Auth_OpenID_CANCEL. Indicates that the
+ * user cancelled the OpenID authentication request. This has two
+ * relevant attributes:
+ *
+ * claimed_id - The identity URL for which authentication was
+ * attempted, if it can be determined. Otherwise, null.
+ *
+ * status - Auth_OpenID_SUCCESS.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_CancelResponse extends Auth_OpenID_ConsumerResponse {
+ var $status = Auth_OpenID_CANCEL;
+
+ function Auth_OpenID_CancelResponse($endpoint)
+ {
+ $this->setEndpoint($endpoint);
+ }
+}
+
+/**
+ * A response with a status of Auth_OpenID_SETUP_NEEDED. Indicates
+ * that the request was in immediate mode, and the server is unable to
+ * authenticate the user without further interaction.
+ *
+ * claimed_id - The identity URL for which authentication was
+ * attempted.
+ *
+ * setup_url - A URL that can be used to send the user to the server
+ * to set up for authentication. The user should be redirected in to
+ * the setup_url, either in the current window or in a new browser
+ * window. Null in OpenID 2.
+ *
+ * status - Auth_OpenID_SETUP_NEEDED.
+ *
+ * @package OpenID
+ */
+class Auth_OpenID_SetupNeededResponse extends Auth_OpenID_ConsumerResponse {
+ var $status = Auth_OpenID_SETUP_NEEDED;
+
+ function Auth_OpenID_SetupNeededResponse($endpoint,
+ $setup_url = null)
+ {
+ $this->setEndpoint($endpoint);
+ $this->setup_url = $setup_url;
+ }
+}
+
+
projects / living-lab-site.git / blobdiff