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<?php
// $Id: openid.inc,v 1.8 2008/01/30 22:11:22 goba Exp $
/**
* @file
* OpenID utility functions.
*/
// Diffie-Hellman Key Exchange Default Value.
define('OPENID_DH_DEFAULT_MOD', '155172898181473697471232257763715539915724801'.
'966915404479707795314057629378541917580651227423698188993727816152646631'.
'438561595825688188889951272158842675419950341258706556549803580104870537'.
'681476726513255747040765857479291291572334510643245094715007229621094194'.
'349783925984760375594985848253359305585439638443');
// Constants for Diffie-Hellman key exchange computations.
define('OPENID_DH_DEFAULT_GEN', '2');
define('OPENID_SHA1_BLOCKSIZE', 64);
define('OPENID_RAND_SOURCE', '/dev/urandom');
// OpenID namespace URLs
define('OPENID_NS_2_0', 'http://specs.openid.net/auth/2.0');
define('OPENID_NS_1_1', 'http://openid.net/signon/1.1');
define('OPENID_NS_1_0', 'http://openid.net/signon/1.0');
/**
* Performs an HTTP 302 redirect (for the 1.x protocol).
*/
function openid_redirect_http($url, $message) {
$query = array();
foreach ($message as $key => $val) {
$query[] = $key .'='. urlencode($val);
}
$sep = (strpos($url, '?') === FALSE) ? '?' : '&';
header('Location: '. $url . $sep . implode('&', $query), TRUE, 302);
exit;
}
/**
* Creates a js auto-submit redirect for (for the 2.x protocol)
*/
function openid_redirect($url, $message) {
$output = '<html><head><title>'. t('OpenID redirect') ."</title></head>\n<body>";
$output .= drupal_get_form('openid_redirect_form', $url, $message);
$output .= '<script type="text/javascript">document.getElementById("openid-redirect-form").submit();</script>';
$output .= "</body></html>\n";
print $output;
exit;
}
function openid_redirect_form(&$form_state, $url, $message) {
$form = array();
$form['#action'] = $url;
$form['#method'] = "post";
foreach ($message as $key => $value) {
$form[$key] = array(
'#type' => 'hidden',
'#name' => $key,
'#value' => $value,
);
}
$form['submit'] = array(
'#type' => 'submit',
'#prefix' => '<noscript>',
'#suffix' => '</noscript>',
'#value' => t('Send'),
);
return $form;
}
/**
* Determine if the given identifier is an XRI ID.
*/
function _openid_is_xri($identifier) {
$firstchar = substr($identifier, 0, 1);
if ($firstchar == "@" || $firstchar == "=")
return TRUE;
if (stristr($identifier, 'xri://') !== FALSE) {
return TRUE;
}
return FALSE;
}
/**
* Normalize the given identifier as per spec.
*/
function _openid_normalize($identifier) {
if (_openid_is_xri($identifier)) {
return _openid_normalize_xri($identifier);
}
else {
return _openid_normalize_url($identifier);
}
}
function _openid_normalize_xri($xri) {
$normalized_xri = $xri;
if (stristr($xri, 'xri://') !== FALSE) {
$normalized_xri = substr($xri, 6);
}
return $normalized_xri;
}
function _openid_normalize_url($url) {
$normalized_url = $url;
if (stristr($url, '://') === FALSE) {
$normalized_url = 'http://'. $url;
}
if (substr_count($normalized_url, '/') < 3) {
$normalized_url .= '/';
}
return $normalized_url;
}
/**
* Create a serialized message packet as per spec: $key:$value\n .
*/
function _openid_create_message($data) {
$serialized = '';
foreach ($data as $key => $value) {
if ((strpos($key, ':') !== FALSE) || (strpos($key, "\n") !== FALSE) || (strpos($value, "\n") !== FALSE)) {
return null;
}
$serialized .= "$key:$value\n";
}
return $serialized;
}
/**
* Encode a message from _openid_create_message for HTTP Post
*/
function _openid_encode_message($message) {
$encoded_message = '';
$items = explode("\n", $message);
foreach ($items as $item) {
$parts = explode(':', $item, 2);
if (count($parts) == 2) {
if ($encoded_message != '') {
$encoded_message .= '&';
}
$encoded_message .= rawurlencode(trim($parts[0])) .'='. rawurlencode(trim($parts[1]));
}
}
return $encoded_message;
}
/**
* Convert a direct communication message
* into an associative array.
*/
function _openid_parse_message($message) {
$parsed_message = array();
$items = explode("\n", $message);
foreach ($items as $item) {
$parts = explode(':', $item, 2);
if (count($parts) == 2) {
$parsed_message[$parts[0]] = $parts[1];
}
}
return $parsed_message;
}
/**
* Return a nonce value - formatted per OpenID spec.
*/
function _openid_nonce() {
// YYYY-MM-DDThh:mm:ssTZD UTC, plus some optional extra unique chars
return gmstrftime('%Y-%m-%dT%H:%M:%S%Z') .
chr(mt_rand(0, 25) + 65) .
chr(mt_rand(0, 25) + 65) .
chr(mt_rand(0, 25) + 65) .
chr(mt_rand(0, 25) + 65);
}
/**
* Pull the href attribute out of an html link element.
*/
function _openid_link_href($rel, $html) {
$rel = preg_quote($rel);
preg_match('|<link\s+rel=["\'](.*)'. $rel .'(.*)["\'](.*)/?>|iUs', $html, $matches);
if (isset($matches[3])) {
preg_match('|href=["\']([^"]+)["\']|iU', $matches[3], $href);
return trim($href[1]);
}
return FALSE;
}
/**
* Pull the http-equiv attribute out of an html meta element
*/
function _openid_meta_httpequiv($equiv, $html) {
preg_match('|<meta\s+http-equiv=["\']'. $equiv .'["\'](.*)/?>|iUs', $html, $matches);
if (isset($matches[1])) {
preg_match('|content=["\']([^"]+)["\']|iUs', $matches[1], $content);
if (isset($content[1])) {
return $content[1];
}
}
return FALSE;
}
/**
* Sign certain keys in a message
* @param $association - object loaded from openid_association or openid_server_association table
* - important fields are ->assoc_type and ->mac_key
* @param $message_array - array of entire message about to be sent
* @param $keys_to_sign - keys in the message to include in signature (without
* 'openid.' appended)
*/
function _openid_signature($association, $message_array, $keys_to_sign) {
$signature = '';
$sign_data = array();
foreach ($keys_to_sign as $key) {
if (isset($message_array['openid.'. $key])) {
$sign_data[$key] = $message_array['openid.'. $key];
}
}
$message = _openid_create_message($sign_data);
$secret = base64_decode($association->mac_key);
$signature = _openid_hmac($secret, $message);
return base64_encode($signature);
}
function _openid_hmac($key, $text) {
if (strlen($key) > OPENID_SHA1_BLOCKSIZE) {
$key = _openid_sha1($key, true);
}
$key = str_pad($key, OPENID_SHA1_BLOCKSIZE, chr(0x00));
$ipad = str_repeat(chr(0x36), OPENID_SHA1_BLOCKSIZE);
$opad = str_repeat(chr(0x5c), OPENID_SHA1_BLOCKSIZE);
$hash1 = _openid_sha1(($key ^ $ipad) . $text, true);
$hmac = _openid_sha1(($key ^ $opad) . $hash1, true);
return $hmac;
}
function _openid_sha1($text) {
$hex = sha1($text);
$raw = '';
for ($i = 0; $i < 40; $i += 2) {
$hexcode = substr($hex, $i, 2);
$charcode = (int)base_convert($hexcode, 16, 10);
$raw .= chr($charcode);
}
return $raw;
}
function _openid_dh_base64_to_long($str) {
$b64 = base64_decode($str);
return _openid_dh_binary_to_long($b64);
}
function _openid_dh_long_to_base64($str) {
return base64_encode(_openid_dh_long_to_binary($str));
}
function _openid_dh_binary_to_long($str) {
$bytes = array_merge(unpack('C*', $str));
$n = 0;
foreach ($bytes as $byte) {
$n = bcmul($n, pow(2, 8));
$n = bcadd($n, $byte);
}
return $n;
}
function _openid_dh_long_to_binary($long) {
$cmp = bccomp($long, 0);
if ($cmp < 0) {
return FALSE;
}
if ($cmp == 0) {
return "\x00";
}
$bytes = array();
while (bccomp($long, 0) > 0) {
array_unshift($bytes, bcmod($long, 256));
$long = bcdiv($long, pow(2, 8));
}
if ($bytes && ($bytes[0] > 127)) {
array_unshift($bytes, 0);
}
$string = '';
foreach ($bytes as $byte) {
$string .= pack('C', $byte);
}
return $string;
}
function _openid_dh_xorsecret($shared, $secret) {
$dh_shared_str = _openid_dh_long_to_binary($shared);
$sha1_dh_shared = _openid_sha1($dh_shared_str);
$xsecret = "";
for ($i = 0; $i < strlen($secret); $i++) {
$xsecret .= chr(ord($secret[$i]) ^ ord($sha1_dh_shared[$i]));
}
return $xsecret;
}
function _openid_dh_rand($stop) {
static $duplicate_cache = array();
// Used as the key for the duplicate cache
$rbytes = _openid_dh_long_to_binary($stop);
if (array_key_exists($rbytes, $duplicate_cache)) {
list($duplicate, $nbytes) = $duplicate_cache[$rbytes];
}
else {
if ($rbytes[0] == "\x00") {
$nbytes = strlen($rbytes) - 1;
}
else {
$nbytes = strlen($rbytes);
}
$mxrand = bcpow(256, $nbytes);
// If we get a number less than this, then it is in the
// duplicated range.
$duplicate = bcmod($mxrand, $stop);
if (count($duplicate_cache) > 10) {
$duplicate_cache = array();
}
$duplicate_cache[$rbytes] = array($duplicate, $nbytes);
}
do {
$bytes = "\x00". _openid_get_bytes($nbytes);
$n = _openid_dh_binary_to_long($bytes);
// Keep looping if this value is in the low duplicated range.
} while (bccomp($n, $duplicate) < 0);
return bcmod($n, $stop);
}
function _openid_get_bytes($num_bytes) {
static $f = null;
$bytes = '';
if (!isset($f)) {
$f = @fopen(OPENID_RAND_SOURCE, "r");
}
if (!$f) {
// pseudorandom used
$bytes = '';
for ($i = 0; $i < $num_bytes; $i += 4) {
$bytes .= pack('L', mt_rand());
}
$bytes = substr($bytes, 0, $num_bytes);
}
else {
$bytes = fread($f, $num_bytes);
}
return $bytes;
}
function _openid_response($str = NULL) {
$data = array();
if (isset($_SERVER['REQUEST_METHOD'])) {
$data = _openid_get_params($_SERVER['QUERY_STRING']);
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$str = file_get_contents('php://input');
$post = array();
if ($str !== false) {
$post = _openid_get_params($str);
}
$data = array_merge($data, $post);
}
}
return $data;
}
function _openid_get_params($str) {
$chunks = explode("&", $str);
$data = array();
foreach ($chunks as $chunk) {
$parts = explode("=", $chunk, 2);
if (count($parts) == 2) {
list($k, $v) = $parts;
$data[$k] = urldecode($v);
}
}
return $data;
}
/**
* Provide bcpowmod support for PHP4.
*/
if (!function_exists('bcpowmod')) {
function bcpowmod($base, $exp, $mod) {
$square = bcmod($base, $mod);
$result = 1;
while (bccomp($exp, 0) > 0) {
if (bcmod($exp, 2)) {
$result = bcmod(bcmul($result, $square), $mod);
}
$square = bcmod(bcmul($square, $square), $mod);
$exp = bcdiv($exp, 2);
}
return $result;
}
}
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