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<?php
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// $Id: openid.inc,v 1.16 2007/06/05 15:54:58 walkah Exp $
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/**
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* @file
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* OpenID utility functions.
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*/
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// Diffie-Hellman Key Exchange Default Value.
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define('OPENID_DH_DEFAULT_MOD', '155172898181473697471232257763715539915724801'.
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'966915404479707795314057629378541917580651227423698188993727816152646631'.
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'438561595825688188889951272158842675419950341258706556549803580104870537'.
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'681476726513255747040765857479291291572334510643245094715007229621094194'.
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'349783925984760375594985848253359305585439638443');
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// Constants for Diffie-Hellman key exchange computations.
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define('OPENID_DH_DEFAULT_GEN', '2');
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define('OPENID_SHA1_BLOCKSIZE', 64);
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define('OPENID_RAND_SOURCE', '/dev/urandom');
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// OpenID namespace URLs
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define('OPENID_NS_2_0', 'http://specs.openid.net/auth/2.0');
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define('OPENID_NS_1_1', 'http://openid.net/signon/1.1');
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define('OPENID_NS_1_0', 'http://openid.net/signon/1.0');
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/**
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* Performs an HTTP 302 redirect (for the 1.x protocol).
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*/
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function openid_redirect_http($url, $message) {
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$query = array();
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foreach ($message as $key => $val) {
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$query[] = $key .'='. urlencode($val);
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}
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$sep = (strpos($url, '?') === FALSE) ? '?' : '&';
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header('Location: ' . $url . $sep . implode('&', $query), TRUE, 302);
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exit;
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}
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/**
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* Creates a js auto-submit redirect for (for the 2.x protocol)
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*/
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function openid_redirect($url, $message) {
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$output = '<html><head><title>'.t('OpenID redirect'). "</title></head>\n<body>";
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$output .= drupal_get_form('openid_redirect_form', $url, $message);
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$output .= '<script type="text/javascript">document.getElementById("openid-redirect-form").submit();</script>';
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$output .= "</body></html>\n";
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print $output;
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exit;
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}
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function openid_redirect_form(&$form_state, $url, $message) {
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$form = array();
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$form['#action'] = $url;
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$form['#method'] = "post";
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foreach ($message as $key => $value) {
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$form[$key] = array(
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'#type' => 'hidden',
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'#name' => $key,
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'#value' => $value,
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);
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}
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$form['submit'] = array(
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'#type' => 'submit',
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'#prefix' => '<noscript>',
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'#suffix' => '</noscript>',
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'#value' => t('Send'),
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);
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return $form;
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}
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/**
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* Determine if the given identifier is an XRI ID.
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*/
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function _openid_is_xri($identifier) {
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$firstchar = substr($identifier, 0, 1);
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if ($firstchar == "@" || $firstchar == "=")
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return TRUE;
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if (stristr($identifier, 'xri://') !== FALSE) {
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return TRUE;
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}
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return FALSE;
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}
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/**
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* Normalize the given identifer as per spec.
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*/
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function _openid_normalize($identifier) {
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if (_openid_is_xri($identifier)) {
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return _openid_normalize_xri($identifier);
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}
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else {
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return _openid_normalize_url($identifier);
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}
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}
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function _openid_normalize_xri($xri) {
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$normalized_xri = $xri;
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if (stristr($xri, 'xri://') !== FALSE) {
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$normalized_xri = substr($xri, 6);
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}
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return $normalized_xri;
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}
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function _openid_normalize_url($url) {
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$normalized_url = $url;
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if (stristr($url, '://') === FALSE) {
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$normalized_url = 'http://' . $url;
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}
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if (substr_count($normalized_url, '/') < 3) {
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$normalized_url .= '/';
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}
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return $normalized_url;
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}
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/**
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* Create a serialized message packet as per spec: $key:$value\n .
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*/
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function _openid_create_message($data) {
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$serialized = '';
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foreach ($data as $key => $value) {
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if ((strpos($key, ':') !== FALSE) || (strpos($key, "\n") !== FALSE) || (strpos($value, "\n") !== FALSE)) {
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return null;
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}
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$serialized .= "$key:$value\n";
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}
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return $serialized;
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}
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/**
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* Encode a message from _openid_create_message for HTTP Post
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*/
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function _openid_encode_message($message) {
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$encoded_message = '';
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$items = explode("\n", $message);
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foreach ($items as $item) {
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$parts = explode(':', $item, 2);
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if (count($parts) == 2) {
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if ($encoded_message != '') {
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$encoded_message .= '&';
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}
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$encoded_message .= rawurlencode(trim($parts[0])) . '=' . rawurlencode(trim($parts[1]));
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}
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}
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return $encoded_message;
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}
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/**
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* Convert a direct communication message
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* into an associative array.
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*/
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function _openid_parse_message($message) {
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$parsed_message = array();
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$items = explode("\n", $message);
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foreach ($items as $item) {
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$parts = explode(':', $item, 2);
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if (count($parts) == 2) {
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$parsed_message[$parts[0]] = $parts[1];
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}
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}
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return $parsed_message;
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}
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/**
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* Return a nonce value - formatted per OpenID spec.
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*/
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function _openid_nonce() {
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// YYYY-MM-DDThh:mm:ssTZD UTC, plus some optional extra unique chars
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return gmstrftime('%Y-%m-%dT%H:%M:%S%Z') .
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chr(mt_rand(0, 25) + 65) .
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chr(mt_rand(0, 25) + 65) .
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chr(mt_rand(0, 25) + 65) .
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chr(mt_rand(0, 25) + 65);
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}
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/**
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* Pull the href attribute out of an html link element.
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*/
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function _openid_link_href($rel, $html) {
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$rel = preg_quote($rel);
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preg_match('|<link\s+rel=["\'](.*)'. $rel .'(.*)["\'](.*)/?>|iU', $html, $matches);
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if (isset($matches[3])) {
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preg_match('|href=["\']([^"]+)["\']|iU', $matches[0], $href);
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return trim($href[1]);
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}
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return FALSE;
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}
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/**
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* Pull the http-equiv attribute out of an html meta element
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*/
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function _openid_meta_httpequiv($equiv, $html) {
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preg_match('|<meta\s+http-equiv=["\']' . $equiv . '["\'](.*)/?>|iU', $html, $matches);
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if (isset($matches[1])) {
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preg_match('|content=["\']([^"]+)["\']|iU', $matches[1], $content);
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return $content[1];
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}
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return FALSE;
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}
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/**
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* Sign certain keys in a message
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* @param $association - object loaded from openid_association or openid_server_association table
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* - important fields are ->assoc_type and ->mac_key
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* @param $message_array - array of entire message about to be sent
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* @param $keys_to_sign - keys in the message to include in signature (without
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* 'openid.' appended)
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*/
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function _openid_signature($association, $message_array, $keys_to_sign) {
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$signature = '';
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$sign_data = array();
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foreach ($keys_to_sign as $key) {
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if (isset($message_array['openid.' . $key])) {
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$sign_data[$key] = $message_array['openid.' . $key];
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}
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}
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$message = _openid_create_message($sign_data);
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$secret = base64_decode($association->mac_key);
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$signature = _openid_hmac($secret, $message);
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return base64_encode($signature);
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}
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function _openid_hmac($key, $text) {
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if (strlen($key) > OPENID_SHA1_BLOCKSIZE) {
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$key = _openid_sha1($key, true);
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}
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$key = str_pad($key, OPENID_SHA1_BLOCKSIZE, chr(0x00));
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$ipad = str_repeat(chr(0x36), OPENID_SHA1_BLOCKSIZE);
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$opad = str_repeat(chr(0x5c), OPENID_SHA1_BLOCKSIZE);
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$hash1 = _openid_sha1(($key ^ $ipad) . $text, true);
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$hmac = _openid_sha1(($key ^ $opad) . $hash1, true);
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return $hmac;
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}
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function _openid_sha1($text) {
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$hex = sha1($text);
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$raw = '';
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for ($i = 0; $i < 40; $i += 2) {
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$hexcode = substr($hex, $i, 2);
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$charcode = (int)base_convert($hexcode, 16, 10);
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$raw .= chr($charcode);
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}
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return $raw;
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}
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function _openid_dh_base64_to_long($str) {
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$b64 = base64_decode($str);
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return _openid_dh_binary_to_long($b64);
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}
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function _openid_dh_long_to_base64($str) {
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return base64_encode(_openid_dh_long_to_binary($str));
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}
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function _openid_dh_binary_to_long($str) {
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$bytes = array_merge(unpack('C*', $str));
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$n = 0;
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foreach ($bytes as $byte) {
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$n = bcmul($n, pow(2, 8));
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$n = bcadd($n, $byte);
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}
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return $n;
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}
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function _openid_dh_long_to_binary($long) {
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$cmp = bccomp($long, 0);
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if ($cmp < 0) {
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return FALSE;
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}
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if ($cmp == 0) {
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return "\x00";
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}
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$bytes = array();
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while (bccomp($long, 0) > 0) {
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array_unshift($bytes, bcmod($long, 256));
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$long = bcdiv($long, pow(2, 8));
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}
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if ($bytes && ($bytes[0] > 127)) {
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array_unshift($bytes, 0);
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}
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$string = '';
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foreach ($bytes as $byte) {
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$string .= pack('C', $byte);
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}
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return $string;
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}
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function _openid_dh_xorsecret($shared, $secret) {
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$dh_shared_str = _openid_dh_long_to_binary($shared);
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$sha1_dh_shared = _openid_sha1($dh_shared_str);
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$xsecret = "";
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for ($i = 0; $i < strlen($secret); $i++) {
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$xsecret .= chr(ord($secret[$i]) ^ ord($sha1_dh_shared[$i]));
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}
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return $xsecret;
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}
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function _openid_dh_rand($stop) {
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static $duplicate_cache = array();
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// Used as the key for the duplicate cache
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$rbytes = _openid_dh_long_to_binary($stop);
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if (array_key_exists($rbytes, $duplicate_cache)) {
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list($duplicate, $nbytes) = $duplicate_cache[$rbytes];
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}
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else {
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if ($rbytes[0] == "\x00") {
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$nbytes = strlen($rbytes) - 1;
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}
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else {
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$nbytes = strlen($rbytes);
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}
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$mxrand = bcpow(256, $nbytes);
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// If we get a number less than this, then it is in the
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// duplicated range.
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$duplicate = bcmod($mxrand, $stop);
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if (count($duplicate_cache) > 10) {
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$duplicate_cache = array();
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}
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$duplicate_cache[$rbytes] = array($duplicate, $nbytes);
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}
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do {
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$bytes = "\x00" . _openid_get_bytes($nbytes);
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$n = _openid_dh_binary_to_long($bytes);
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// Keep looping if this value is in the low duplicated range.
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} while (bccomp($n, $duplicate) < 0);
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return bcmod($n, $stop);
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}
|
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|
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function _openid_get_bytes($num_bytes) {
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static $f = null;
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$bytes = '';
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| 368 |
if (!isset($f)) {
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$f = @fopen(OPENID_RAND_SOURCE, "r");
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}
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| 371 |
if (!isset($f)) {
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| 372 |
// pseudorandom used
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| 373 |
$bytes = '';
|
| 374 |
for ($i = 0; $i < $num_bytes; $i += 4) {
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| 375 |
$bytes .= pack('L', mt_rand());
|
| 376 |
}
|
| 377 |
$bytes = substr($bytes, 0, $num_bytes);
|
| 378 |
}
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else {
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| 380 |
$bytes = fread($f, $num_bytes);
|
| 381 |
}
|
| 382 |
return $bytes;
|
| 383 |
}
|
| 384 |
|
| 385 |
/**
|
| 386 |
* Fix PHP's habit of replacing '.' by '_' in posted data.
|
| 387 |
*/
|
| 388 |
function _openid_fix_post(&$post) {
|
| 389 |
$extensions = module_invoke_all('openid', 'extension');
|
| 390 |
foreach ($post as $key => $value) {
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| 391 |
if (strpos($key, 'openid_') === 0) {
|
| 392 |
$fixed_key = str_replace('openid_', 'openid.', $key);
|
| 393 |
$fixed_key = str_replace('openid.ns_', 'openid.ns.', $fixed_key);
|
| 394 |
$fixed_key = str_replace('openid.sreg_', 'openid.sreg.', $fixed_key);
|
| 395 |
foreach ($extensions as $ext) {
|
| 396 |
$fixed_key = str_replace('openid.'.$ext.'_', 'openid.'.$ext.'.', $fixed_key);
|
| 397 |
}
|
| 398 |
unset($post[$key]);
|
| 399 |
$post[$fixed_key] = $value;
|
| 400 |
}
|
| 401 |
}
|
| 402 |
}
|
| 403 |
|
| 404 |
/**
|
| 405 |
* Provide bcpowmod support for PHP4.
|
| 406 |
*/
|
| 407 |
if (!function_exists('bcpowmod')) {
|
| 408 |
function bcpowmod($base, $exp, $mod) {
|
| 409 |
$square = bcmod($base, $mod);
|
| 410 |
$result = 1;
|
| 411 |
while (bccomp($exp, 0) > 0) {
|
| 412 |
if (bcmod($exp, 2)) {
|
| 413 |
$result = bcmod(bcmul($result, $square), $mod);
|
| 414 |
}
|
| 415 |
$square = bcmod(bcmul($square, $square), $mod);
|
| 416 |
$exp = bcdiv($exp, 2);
|
| 417 |
}
|
| 418 |
return $result;
|
| 419 |
}
|
| 420 |
}
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