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| <?php |
| /** |
| * Functions for dealing with OpenID trust roots |
| * |
| * PHP versions 4 and 5 |
| * |
| * LICENSE: See the COPYING file included in this distribution. |
| * |
| * @package OpenID |
| * @author JanRain, Inc. <openid@janrain.com> |
| * @copyright 2005 Janrain, Inc. |
| * @license http://www.gnu.org/copyleft/lesser.html LGPL |
| */ |
| |
| /** |
| * A regular expression that matches a domain ending in a top-level domains. |
| * Used in checking trust roots for sanity. |
| * |
| * @access private |
| */ |
| define('Auth_OpenID___TLDs', |
| '/\.(com|edu|gov|int|mil|net|org|biz|info|name|museum|coop|aero|ac|' . |
| 'ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|az|ba|bb|bd|be|bf|bg|' . |
| 'bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|' . |
| 'cm|cn|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|' . |
| 'fi|fj|fk|fm|fo|fr|ga|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|' . |
| 'gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|' . |
| 'ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|' . |
| 'ma|mc|md|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|' . |
| 'nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|' . |
| 'ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|' . |
| 'so|sr|st|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|' . |
| 'ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)$/'); |
| |
| /** |
| * A wrapper for trust-root related functions |
| */ |
| class Auth_OpenID_TrustRoot { |
| /** |
| * Parse a URL into its trust_root parts. |
| * |
| * @static |
| * |
| * @access private |
| * |
| * @param string $trust_root The url to parse |
| * |
| * @return mixed $parsed Either an associative array of trust root |
| * parts or false if parsing failed. |
| */ |
| function _parse($trust_root) |
| { |
| $parts = @parse_url($trust_root); |
| if ($parts === false) { |
| return false; |
| } |
| $required_parts = array('scheme', 'host'); |
| $forbidden_parts = array('user', 'pass', 'fragment'); |
| $keys = array_keys($parts); |
| if (array_intersect($keys, $required_parts) != $required_parts) { |
| return false; |
| } |
| |
| if (array_intersect($keys, $forbidden_parts) != array()) { |
| return false; |
| } |
| |
| // Return false if the original trust root value has more than |
| // one port specification. |
| if (preg_match("/:\/\/[^:]+(:\d+){2,}(\/|$)/", $trust_root)) { |
| return false; |
| } |
| |
| $scheme = strtolower($parts['scheme']); |
| $allowed_schemes = array('http', 'https'); |
| if (!in_array($scheme, $allowed_schemes)) { |
| return false; |
| } |
| $parts['scheme'] = $scheme; |
| |
| $host = strtolower($parts['host']); |
| $hostparts = explode('*', $host); |
| switch (count($hostparts)) { |
| case 1: |
| $parts['wildcard'] = false; |
| break; |
| case 2: |
| if ($hostparts[0] || |
| ($hostparts[1] && substr($hostparts[1], 0, 1) != '.')) { |
| return false; |
| } |
| $host = $hostparts[1]; |
| $parts['wildcard'] = true; |
| break; |
| default: |
| return false; |
| } |
| if (strpos($host, ':') !== false) { |
| return false; |
| } |
| |
| $parts['host'] = $host; |
| |
| if (isset($parts['path'])) { |
| $path = strtolower($parts['path']); |
| if (substr($path, -1) != '/') { |
| $path .= '/'; |
| } |
| } else { |
| $path = '/'; |
| } |
| $parts['path'] = $path; |
| if (!isset($parts['port'])) { |
| $parts['port'] = false; |
| } |
| return $parts; |
| } |
| |
| /** |
| * Is this trust root sane? |
| * |
| * A trust root is sane if it is syntactically valid and it has a |
| * reasonable domain name. Specifically, the domain name must be |
| * more than one level below a standard TLD or more than two |
| * levels below a two-letter tld. |
| * |
| * For example, '*.com' is not a sane trust root, but '*.foo.com' |
| * is. '*.co.uk' is not sane, but '*.bbc.co.uk' is. |
| * |
| * This check is not always correct, but it attempts to err on the |
| * side of marking sane trust roots insane instead of marking |
| * insane trust roots sane. For example, 'kink.fm' is marked as |
| * insane even though it "should" (for some meaning of should) be |
| * marked sane. |
| * |
| * This function should be used when creating OpenID servers to |
| * alert the users of the server when a consumer attempts to get |
| * the user to accept a suspicious trust root. |
| * |
| * @static |
| * @param string $trust_root The trust root to check |
| * @return bool $sanity Whether the trust root looks OK |
| */ |
| function isSane($trust_root) |
| { |
| $parts = Auth_OpenID_TrustRoot::_parse($trust_root); |
| if ($parts === false) { |
| return false; |
| } |
| |
| // Localhost is a special case |
| if ($parts['host'] == 'localhost') { |
| return true; |
| } |
| |
| // Get the top-level domain of the host. If it is not a valid TLD, |
| // it's not sane. |
| preg_match(Auth_OpenID___TLDs, $parts['host'], $matches); |
| if (!$matches) { |
| return false; |
| } |
| $tld = $matches[1]; |
| |
| // Require at least two levels of specificity for non-country |
| // tlds and three levels for country tlds. |
| $elements = explode('.', $parts['host']); |
| $n = count($elements); |
| if ($parts['wildcard']) { |
| $n -= 1; |
| } |
| if (strlen($tld) == 2) { |
| $n -= 1; |
| } |
| if ($n <= 1) { |
| return false; |
| } |
| return true; |
| } |
| |
| /** |
| * Does this URL match the given trust root? |
| * |
| * Return whether the URL falls under the given trust root. This |
| * does not check whether the trust root is sane. If the URL or |
| * trust root do not parse, this function will return false. |
| * |
| * @param string $trust_root The trust root to match against |
| * |
| * @param string $url The URL to check |
| * |
| * @return bool $matches Whether the URL matches against the |
| * trust root |
| */ |
| function match($trust_root, $url) |
| { |
| $trust_root_parsed = Auth_OpenID_TrustRoot::_parse($trust_root); |
| $url_parsed = Auth_OpenID_TrustRoot::_parse($url); |
| if (!$trust_root_parsed || !$url_parsed) { |
| return false; |
| } |
| |
| // Check hosts matching |
| if ($url_parsed['wildcard']) { |
| return false; |
| } |
| if ($trust_root_parsed['wildcard']) { |
| $host_tail = $trust_root_parsed['host']; |
| $host = $url_parsed['host']; |
| if ($host_tail && |
| substr($host, -(strlen($host_tail))) != $host_tail && |
| substr($host_tail, 1) != $host) { |
| return false; |
| } |
| } else { |
| if ($trust_root_parsed['host'] != $url_parsed['host']) { |
| return false; |
| } |
| } |
| |
| // Check path and query matching |
| $base_path = $trust_root_parsed['path']; |
| $path = $url_parsed['path']; |
| if (!isset($trust_root_parsed['query'])) { |
| if (substr($path, 0, strlen($base_path)) != $base_path) { |
| return false; |
| } |
| } else { |
| $base_query = $trust_root_parsed['query']; |
| $query = @$url_parsed['query']; |
| $qplus = substr($query, 0, strlen($base_query) + 1); |
| $bqplus = $base_query . '&'; |
| if ($base_path != $path || |
| ($base_query != $query && $qplus != $bqplus)) { |
| return false; |
| } |
| } |
| |
| // The port and scheme need to match exactly |
| return ($trust_root_parsed['scheme'] == $url_parsed['scheme'] && |
| $url_parsed['port'] === $trust_root_parsed['port']); |
| } |
| } |
| ?> |