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470 lines
18 KiB
470 lines
18 KiB
<?php
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/* For licensing terms, see /license.txt */
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/**
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* OpenID login method
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*
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* The OpenID login method relies on authentication servers providing a public
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* URL that can confirm the identity of a person, thus avoiding the spread
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* use of password transmissions over non-secure lines (for Dokeos, it is a
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* good way of avoiding password theft)
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* @package chamilo.auth.openid
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*/
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/**
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* Initialisation
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*/
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require_once api_get_path(CONFIGURATION_PATH) . 'auth.conf.php';
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require_once 'openid.lib.php';
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require_once 'xrds.lib.php';
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function openid_form()
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{
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$form = new FormValidator(
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'openid_login',
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'post',
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null,
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null,
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array('class' => 'form-vertical form_login')
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);
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$form -> addElement('text', 'openid_url', array(get_lang('OpenIDURL'), Display::url(get_lang('OpenIDWhatIs'), 'main/auth/openid/whatis.php')), array('class' => 'openid_input'));
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$form -> addElement('button', 'submit', get_lang('Login'));
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return $form->return_form();
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}
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/**
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* The initial step of OpenID authentication responsible for the following:
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* - Perform discovery on the claimed OpenID.
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* - If possible, create an association with the Provider's endpoint.
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* - Create the authentication request.
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* - Perform the appropriate redirect.
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*
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* @param $claimed_id The OpenID to authenticate
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* @param $return_to The endpoint to return to from the OpenID Provider
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*/
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function openid_begin($claimed_id, $return_to = '', $form_values = array()) {
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$claimed_id = _openid_normalize($claimed_id);
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$services = openid_discovery($claimed_id);
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if (count($services) == 0) {
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echo 'Sorry, that is not a valid OpenID. Please ensure you have spelled your ID correctly.';
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return;
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}
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$op_endpoint = $services[0]['uri'];
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// Store the discovered endpoint in the session (so we don't have to rediscover).
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$_SESSION['openid_op_endpoint'] = $op_endpoint;
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// Store the claimed_id in the session (for handling delegation).
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$_SESSION['openid_claimed_id'] = $claimed_id;
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// Store the login form values so we can pass them to
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// user_exteral_login later.
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$_SESSION['openid_user_login_values'] = $form_values;
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// If bcmath is present, then create an association
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$assoc_handle = '';
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if (function_exists('bcadd')) {
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$assoc_handle = openid_association($op_endpoint);
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}
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// Now that there is an association created, move on
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// to request authentication from the IdP
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$identity = (!empty($services[0]['delegate'])) ? $services[0]['delegate'] : $claimed_id;
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if (isset($services[0]['types']) && is_array($services[0]['types']) && in_array(OPENID_NS_2_0 . '/server', $services[0]['types'])) {
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$identity = 'http://openid.net/identifier_select/2.0';
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}
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$authn_request = openid_authentication_request($claimed_id, $identity, $return_to, $assoc_handle, $services[0]['version']);
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if ($services[0]['version'] == 2) {
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echo openid_redirect($op_endpoint, $authn_request);
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} else {
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echo openid_redirect_http($op_endpoint, $authn_request);
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}
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}
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/**
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* Completes OpenID authentication by validating returned data from the OpenID
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* Provider.
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*
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* @param $response Array of returned from the OpenID provider (typically $_REQUEST).
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*
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* @return $response Response values for further processing with
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* $response['status'] set to one of 'success', 'failed' or 'cancel'.
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*/
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function openid_complete($response) {
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// Default to failed response
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$response['status'] = 'failed';
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if (isset($_SESSION['openid_op_endpoint']) && isset($_SESSION['openid_claimed_id'])) {
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_openid_fix_post($response);
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$op_endpoint = $_SESSION['openid_op_endpoint'];
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$claimed_id = $_SESSION['openid_claimed_id'];
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unset($_SESSION['openid_op_endpoint']);
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unset($_SESSION['openid_claimed_id']);
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if (isset($response['openid.mode'])) {
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if ($response['openid.mode'] == 'cancel') {
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$response['status'] = 'cancel';
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} else {
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if (openid_verify_assertion($op_endpoint, $response)) {
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$response['openid.identity'] = $claimed_id;
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$response['status'] = 'success';
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}
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}
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}
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}
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return $response;
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}
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/**
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* Perform discovery on a claimed ID to determine the OpenID provider endpoint.
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*
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* @param $claimed_id The OpenID URL to perform discovery on.
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*
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* @return Array of services discovered (including OpenID version, endpoint
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* URI, etc).
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*/
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function openid_discovery($claimed_id)
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{
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$services = array();
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$xrds_url = $claimed_id;
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if (_openid_is_xri($claimed_id)) {
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$xrds_url = 'http://xri.net/' . $claimed_id;
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}
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$url = @parse_url($xrds_url);
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if ($url['scheme'] == 'http' || $url['scheme'] == 'https') {
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// For regular URLs, try Yadis resolution first, then HTML-based discovery
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$headers = array('Accept' => 'application/xrds+xml');
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//TODO
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$result = openid_http_request($xrds_url, $headers);
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if (!isset($result->error)) {
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if (isset($result->headers['Content-Type']) && preg_match("/application\/xrds\+xml/", $result->headers['Content-Type'])) {
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// Parse XML document to find URL
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$services = xrds_parse($result->data);
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} else {
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$xrds_url = NULL;
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if (isset($result->headers['X-XRDS-Location'])) {
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$xrds_url = $result->headers['X-XRDS-Location'];
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} else {
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// Look for meta http-equiv link in HTML head
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$xrds_url = _openid_meta_httpequiv('X-XRDS-Location', $result->data);
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}
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if (!empty($xrds_url)) {
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$headers = array('Accept' => 'application/xrds+xml');
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//TODO
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$xrds_result = openid_http_request($xrds_url, $headers);
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if (!isset($xrds_result->error)) {
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$services = xrds_parse($xrds_result->data);
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}
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}
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}
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// Check for HTML delegation
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if (count($services) == 0) {
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// Look for 2.0 links
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$uri = _openid_link_href('openid2.provider', $result->data);
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$delegate = _openid_link_href('openid2.local_id', $result->data);
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$version = 2;
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// 1.0 links
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if (empty($uri)) {
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$uri = _openid_link_href('openid.server', $result->data);
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$delegate = _openid_link_href('openid.delegate', $result->data);
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$version = 1;
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}
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if (!empty($uri)) {
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$services[] = array('uri' => $uri, 'delegate' => $delegate, 'version' => $version);
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}
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}
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}
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}
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return $services;
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}
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/**
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* Attempt to create a shared secret with the OpenID Provider.
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*
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* @param $op_endpoint URL of the OpenID Provider endpoint.
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*
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* @return $assoc_handle The association handle.
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*/
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function openid_association($op_endpoint) {
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//@todo Remove Old Associations:
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$openid_association = Database::get_main_table(TABLE_MAIN_OPENID_ASSOCIATION);
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$sql = "DELETE FROM $openid_association
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WHERE created + expires_in < '" . api_get_utc_datetime() . "'";
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Database::query($sql);
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// Check to see if we have an association for this IdP already
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$op_endpoint = Database::escape_string($op_endpoint);
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$sql = "SELECT assoc_handle
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FROM $openid_association
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WHERE idp_endpoint_uri = '$op_endpoint'";
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$assoc_handle = Database::query($sql);
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if (Database::num_rows($assoc_handle) <= 1) {
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$mod = OPENID_DH_DEFAULT_MOD;
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$gen = OPENID_DH_DEFAULT_GEN;
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$r = _openid_dh_rand($mod);
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$private = bcadd($r, 1);
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$public = bcpowmod($gen, $private, $mod);
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// If there is no existing association, then request one
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$assoc_request = openid_association_request($public);
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$assoc_message = _openid_encode_message(_openid_create_message($assoc_request));
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$assoc_headers = array('Content-Type' => 'application/x-www-form-urlencoded; charset=utf-8');
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//TODO
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$assoc_result = openid_http_request($op_endpoint, $assoc_headers, 'POST', $assoc_message);
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if (isset($assoc_result->error)) {
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return FALSE;
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}
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$assoc_response = _openid_parse_message($assoc_result->data);
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if (isset($assoc_response['mode']) && $assoc_response['mode'] == 'error') {
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return FALSE;
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}
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if ($assoc_response['session_type'] == 'DH-SHA1') {
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$spub = _openid_dh_base64_to_long($assoc_response['dh_server_public']);
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$enc_mac_key = base64_decode($assoc_response['enc_mac_key']);
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$shared = bcpowmod($spub, $private, $mod);
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$assoc_response['mac_key'] = base64_encode(_openid_dh_xorsecret($shared, $enc_mac_key));
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}
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//TODO
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$openid_association = Database::get_main_table(TABLE_MAIN_OPENID_ASSOCIATION);
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Database::query(sprintf("INSERT INTO $openid_association (idp_endpoint_uri, session_type, assoc_handle, assoc_type, expires_in, mac_key, created) VALUES('%s', '%s', '%s', '%s', %d, '%s', %d)", $op_endpoint, $assoc_response['session_type'], $assoc_response['assoc_handle'], $assoc_response['assoc_type'], $assoc_response['expires_in'], $assoc_response['mac_key'], api_get_utc_datetime()));
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$assoc_handle = $assoc_response['assoc_handle'];
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}
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return $assoc_handle;
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}
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/**
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* ?
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*/
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function openid_association_request($public) {
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$request = array(
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'openid.ns' => OPENID_NS_2_0,
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'openid.mode' => 'associate',
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'openid.session_type' => 'DH-SHA1',
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'openid.assoc_type' => 'HMAC-SHA1'
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);
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if ($request['openid.session_type'] == 'DH-SHA1' || $request['openid.session_type'] == 'DH-SHA256') {
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$cpub = _openid_dh_long_to_base64($public);
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$request['openid.dh_consumer_public'] = $cpub;
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}
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return $request;
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}
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/**
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*
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*/
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function openid_authentication_request($claimed_id, $identity, $return_to = '', $assoc_handle = '', $version = 2) {
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$realm = ($return_to) ? $return_to : api_get_self();
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$ns = ($version == 2) ? OPENID_NS_2_0 : OPENID_NS_1_0;
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$request = array(
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'openid.ns' => $ns,
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'openid.mode' => 'checkid_setup',
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'openid.identity' => $identity,
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'openid.claimed_id' => $claimed_id,
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'openid.assoc_handle' => $assoc_handle,
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'openid.return_to' => $return_to,
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);
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if ($version == 2) {
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$request['openid.realm'] = $realm;
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} else {
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$request['openid.trust_root'] = $realm;
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}
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// Simple Registration - we don't ask lastname and firstname because the only
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// available similar data is "fullname" and we would have to guess where to split
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$request['openid.sreg.required'] = 'nickname,email';
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$request['openid.ns.sreg'] = "http://openid.net/extensions/sreg/1.1";
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//$request = array_merge($request, module_invoke_all('openid', 'request', $request));
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//$request = array_merge($request);
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return $request;
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}
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/**
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* Attempt to verify the response received from the OpenID Provider.
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*
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* @param $op_endpoint The OpenID Provider URL.
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* @param $response Array of repsonse values from the provider.
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*
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* @return boolean
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*/
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function openid_verify_assertion($op_endpoint, $response) {
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$valid = FALSE;
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//TODO
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$openid_association = Database::get_main_table(TABLE_MAIN_OPENID_ASSOCIATION);
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$sql = sprintf("SELECT * FROM $openid_association WHERE assoc_handle = '%s'", $response['openid.assoc_handle']);
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$res = Database::query($sql);
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$association = Database::fetch_object($res);
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if ($association && isset($association->session_type)) {
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$keys_to_sign = explode(',', $response['openid.signed']);
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$self_sig = _openid_signature($association, $response, $keys_to_sign);
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if ($self_sig == $response['openid.sig']) {
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$valid = TRUE;
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} else {
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$valid = FALSE;
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}
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} else {
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$request = $response;
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$request['openid.mode'] = 'check_authentication';
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$message = _openid_create_message($request);
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$headers = array('Content-Type' => 'application/x-www-form-urlencoded; charset=utf-8');
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$result = openid_http_request($op_endpoint, $headers, 'POST', _openid_encode_message($message));
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if (!isset($result->error)) {
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$response = _openid_parse_message($result->data);
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if (strtolower(trim($response['is_valid'])) == 'true') {
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$valid = TRUE;
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} else {
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$valid = FALSE;
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}
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}
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}
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return $valid;
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}
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/**
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* Make a HTTP request - This function has been copied straight over from Drupal 6 code (drupal_http_request)
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* @param string $data
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*/
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function openid_http_request($url, $headers = array(), $method = 'GET', $data = NULL, $retry = 3) {
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$result = new stdClass();
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// Parse the URL and make sure we can handle the schema.
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$uri = parse_url($url);
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switch ($uri['scheme']) {
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case 'http':
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$port = isset($uri['port']) ? $uri['port'] : 80;
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$host = $uri['host'] . ($port != 80 ? ':' . $port : '');
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$fp = @fsockopen($uri['host'], $port, $errno, $errstr, 15);
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break;
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case 'https':
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// Note: Only works for PHP 4.3 compiled with OpenSSL.
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$port = isset($uri['port']) ? $uri['port'] : 443;
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$host = $uri['host'] . ($port != 443 ? ':' . $port : '');
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$fp = @fsockopen('ssl://' . $uri['host'], $port, $errno, $errstr, 20);
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break;
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default:
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$result->error = 'invalid schema ' . $uri['scheme'];
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return $result;
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}
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// Make sure the socket opened properly.
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if (!$fp) {
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// When a network error occurs, we make sure that it is a negative number so
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// it can clash with the HTTP status codes.
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$result->code = -$errno;
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$result->error = trim($errstr);
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return $result;
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}
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// Construct the path to act on.
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$path = isset($uri['path']) ? $uri['path'] : '/';
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if (isset($uri['query'])) {
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$path .= '?' . $uri['query'];
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}
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// Create HTTP request.
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$defaults = array(
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// RFC 2616: "non-standard ports MUST, default ports MAY be included".
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// We don't add the port to prevent from breaking rewrite rules checking the
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// host that do not take into account the port number.
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'Host' => "Host: $host",
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'User-Agent' => 'User-Agent: Chamilo (+http://www.chamilo.org/)',
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'Content-Length' => 'Content-Length: ' . strlen($data)
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);
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// If the server url has a user then attempt to use basic authentication
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if (isset($uri['user'])) {
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$defaults['Authorization'] = 'Authorization: Basic ' . base64_encode($uri['user'] . (!empty($uri['pass']) ? ":" . $uri['pass'] : ''));
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}
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foreach ($headers as $header => $value) {
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$defaults[$header] = $header . ': ' . $value;
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}
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$request = $method . ' ' . $path . " HTTP/1.0\r\n";
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$request .= implode("\r\n", $defaults);
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$request .= "\r\n\r\n";
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if ($data) {
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$request .= $data . "\r\n";
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}
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$result->request = $request;
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fwrite($fp, $request);
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// Fetch response.
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$response = '';
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while (!feof($fp) && $chunk = fread($fp, 1024)) {
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$response .= $chunk;
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}
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fclose($fp);
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// Parse response.
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list($split, $result->data) = explode("\r\n\r\n", $response, 2);
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$split = preg_split("/\r\n|\n|\r/", $split);
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list($protocol, $code, $text) = explode(' ', trim(array_shift($split)), 3);
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$result->headers = array();
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// Parse headers.
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while ($line = trim(array_shift($split))) {
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list($header, $value) = explode(':', $line, 2);
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if (isset($result->headers[$header]) && $header == 'Set-Cookie') {
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// RFC 2109: the Set-Cookie response header comprises the token Set-
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// Cookie:, followed by a comma-separated list of one or more cookies.
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$result->headers[$header] .= ',' . trim($value);
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} else {
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$result->headers[$header] = trim($value);
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}
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}
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$responses = array(
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100 => 'Continue', 101 => 'Switching Protocols',
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200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content',
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300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect',
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400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Time-out', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Large', 415 => 'Unsupported Media Type', 416 => 'Requested range not satisfiable', 417 => 'Expectation Failed',
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500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Time-out', 505 => 'HTTP Version not supported'
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);
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// RFC 2616 states that all unknown HTTP codes must be treated the same as the
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// base code in their class.
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if (!isset($responses[$code])) {
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$code = floor($code / 100) * 100;
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}
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switch ($code) {
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case 200: // OK
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case 304: // Not modified
|
|
break;
|
|
case 301: // Moved permanently
|
|
case 302: // Moved temporarily
|
|
case 307: // Moved temporarily
|
|
$location = $result->headers['Location'];
|
|
|
|
if ($retry) {
|
|
$result = openid_http_request($result->headers['Location'], $headers, $method, $data, --$retry);
|
|
$result->redirect_code = $result->code;
|
|
}
|
|
$result->redirect_url = $location;
|
|
|
|
break;
|
|
default:
|
|
$result->error = $text;
|
|
}
|
|
|
|
$result->code = $code;
|
|
return $result;
|
|
}
|
|
|