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- <?php
- /**
- * DooDigestAuth class file.
- *
- * @author Leng Sheng Hong <darkredz@gmail.com>
- * @link http://www.doophp.com/
- * @copyright Copyright © 2009 Leng Sheng Hong
- * @license http://www.doophp.com/license
- */
- /**
- * Handles HTTP digest authentication
- *
- * <p>HTTP digest authentication can be used with the URI router.
- * HTTP digest is much more recommended over the use of HTTP Basic auth which doesn't provide any encryption.
- * If you are running PHP on Apache in CGI/FastCGI mode, you would need to
- * add the following line to your .htaccess for digest auth to work correctly.</p>
- * <code>RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]</code>
- *
- * <p>This class is tested under Apache 2.2 and Cherokee web server. It should work in both mod_php and cgi mode.</p>
- *
- * @author Leng Sheng Hong <darkredz@gmail.com>
- * @version $Id: DooDigestAuth.php 1000 2009-07-7 18:27:22
- * @package doo.auth
- * @since 1.0
- */
- class DooDigestAuth{
- /**
- * Authenticate against a list of username and passwords.
- *
- * <p>HTTP Digest Authentication doesn't work with PHP in CGI mode,
- * you have to add this into your .htaccess <code>RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]</code></p>
- *
- * @param string $realm Name of the authentication session
- * @param array $users An assoc array of username and password: array('uname1'=>'pwd1', 'uname2'=>'pwd2')
- * @param string $fail_msg Message to be displayed if the User cancel the login
- * @param string $fail_url URL to be redirect if the User cancel the login
- * @return string The username if login success.
- */
- public static function http_auth($realm, $users, $fail_msg=NULL, $fail_url=NULL){
- $realm = "Restricted area - $realm";
- //user => password
- //$users = array('admin' => '1234', 'guest' => 'guest');
- if(!empty($_SERVER['REDIRECT_HTTP_AUTHORIZATION']) && strpos($_SERVER['REDIRECT_HTTP_AUTHORIZATION'], 'Digest')===0){
- $_SERVER['PHP_AUTH_DIGEST'] = $_SERVER['REDIRECT_HTTP_AUTHORIZATION'];
- }
- if (empty($_SERVER['PHP_AUTH_DIGEST'])) {
- header('WWW-Authenticate: Digest realm="'.$realm.
- '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
- header('HTTP/1.1 401 Unauthorized');
- if($fail_msg!=NULL)
- die($fail_msg);
- if($fail_url!=NULL)
- die("<script>window.location.href = '$fail_url'</script>");
- exit;
- }
- // analyze the PHP_AUTH_DIGEST variable
- if (!($data = self::http_digest_parse($_SERVER['PHP_AUTH_DIGEST'])) || !isset($users[$data['username']])){
- header('WWW-Authenticate: Digest realm="'.$realm.
- '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
- header('HTTP/1.1 401 Unauthorized');
- if($fail_msg!=NULL)
- die($fail_msg);
- if($fail_url!=NULL)
- die("<script>window.location.href = '$fail_url'</script>");
- exit;
- }
- // generate the valid response
- $A1 = md5($data['username'] . ':' . $realm . ':' . $users[$data['username']]);
- $A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
- $valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);
- if ($data['response'] != $valid_response){
- header('HTTP/1.1 401 Unauthorized');
- header('WWW-Authenticate: Digest realm="'.$realm.
- '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
- if($fail_msg!=NULL)
- die($fail_msg);
- if($fail_url!=NULL)
- die("<script>window.location.href = '$fail_url'</script>");
- exit;
- }
- // ok, valid username & password
- return $data['username'];
- }
- /**
- * Method to parse the http auth header, works with IE.
- *
- * Internet Explorer returns a qop="xxxxxxxxxxx" in the header instead of qop=xxxxxxxxxxx as most browsers do.
- *
- * @param string $txt header string to parse
- * @return array An assoc array of the digest auth session
- */
- private static function http_digest_parse($txt)
- {
- $res = preg_match("/username=\"([^\"]+)\"/i", $txt, $match);
- $data['username'] = (isset($match[1]))?$match[1]:null;
- $res = preg_match('/nonce=\"([^\"]+)\"/i', $txt, $match);
- $data['nonce'] = $match[1];
- $res = preg_match('/nc=([0-9]+)/i', $txt, $match);
- $data['nc'] = $match[1];
- $res = preg_match('/cnonce=\"([^\"]+)\"/i', $txt, $match);
- $data['cnonce'] = $match[1];
- $res = preg_match('/qop=([^,]+)/i', $txt, $match);
- $data['qop'] = str_replace('"','',$match[1]);
- $res = preg_match('/uri=\"([^\"]+)\"/i', $txt, $match);
- $data['uri'] = $match[1];
- $res = preg_match('/response=\"([^\"]+)\"/i', $txt, $match);
- $data['response'] = $match[1];
- return $data;
- }
- }
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