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254 lines
10 KiB
PHP
254 lines
10 KiB
PHP
<?php
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/**
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* eGroupWare API: Basic and Digest Auth
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*
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* For Apache FCGI you need the following rewrite rule:
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*
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* RewriteEngine on
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* RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]
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*
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* Otherwise authentication request will be send over and over again, as password is NOT available to PHP!
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* (This makes authentication details available in PHP as $_SERVER['REDIRECT_HTTP_AUTHORIZATION']
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage auth
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2010 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* Class to authenticate via basic or digest auth
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*
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* The more secure digest auth requires:
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* a) cleartext passwords in SQL table
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* b) md5 hashes of username, realm, password stored somewhere (NOT yet implemented)
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* Otherwise digest auth is not possible and therefore not offered to the client.
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*
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* Usage example:
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*
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* $GLOBALS['egw_info']['flags'] = array(
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* 'noheader' => True,
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* 'currentapp' => 'someapp',
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* 'no_exception_handler' => 'basic_auth', // we use a basic auth exception handler (sends exception message as basic auth realm)
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* 'autocreate_session_callback' => array('egw_digest_auth','autocreate_session_callback'),
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* 'auth_realm' => 'EGroupware',
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* );
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* include(dirname(__FILE__).'/header.inc.php');
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*
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* @link http://www.php.net/manual/en/features.http-auth.php
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* @ToDo check if we have to check if returned nonce matches our challange (not done in above link, but why would it be there)
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* @link http://en.wikipedia.org/wiki/Digest_access_authentication
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* @link http://tools.ietf.org/html/rfc2617
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*
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* Commented out is accept-charset parameter from (seems not supported by any client I tested with)
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* @link https://tools.ietf.org/id/draft-reschke-basicauth-enc-06.html
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*
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* Implemented support for clients sending credentials in in iso-8859-1 instead of our utf-8:
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* - Firefox 19.0
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* - Thunderbird 17.0.3 with Lightning 1.8
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* - IE 8
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* - Netdrive
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* (Chrome 24 or Safari 6 sends credentials in charset of webpage.)
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*/
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class egw_digest_auth
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{
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/**
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* Log to error_log:
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* 0 = dont
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* 1 = no cleartext passwords
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* 2 = all
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*/
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const ERROR_LOG = 0;
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/**
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* Callback to be used to create session via header include authenticated via basic or digest auth
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*
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* @param array $account NOT used!
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* @return string valid session-id or does NOT return at all!
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*/
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static public function autocreate_session_callback(&$account)
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{
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unset($account); // not used, but required by function signature
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if (self::ERROR_LOG)
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{
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$pw = self::ERROR_LOG > 1 ? $_SERVER['PHP_AUTH_PW'] : '**********';
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error_log(__METHOD__.'() PHP_AUTH_USER='.array2string($_SERVER['PHP_AUTH_USER']).', PHP_AUTH_PW='.array2string($pw).', PHP_AUTH_DIGEST='.array2string($_SERVER['PHP_AUTH_DIGEST']));
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}
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$realm = $GLOBALS['egw_info']['flags']['auth_realm'];
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if (empty($realm)) $realm = 'EGroupware';
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$username = $_SERVER['PHP_AUTH_USER']; $password = $_SERVER['PHP_AUTH_PW'];
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// Support for basic auth when using PHP CGI (what about digest auth?)
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if (!isset($username) && !empty($_SERVER['REDIRECT_HTTP_AUTHORIZATION']) && strpos($_SERVER['REDIRECT_HTTP_AUTHORIZATION'],'Basic ') === 0)
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{
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$hash = base64_decode(substr($_SERVER['REDIRECT_HTTP_AUTHORIZATION'],6));
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if (strpos($hash, ':') !== false)
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{
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list($username, $password) = explode(':', $hash, 2);
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}
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}
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elseif (isset($_SERVER['PHP_AUTH_DIGEST']) && !self::is_valid($realm,$_SERVER['PHP_AUTH_DIGEST'],$username,$password))
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{
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unset($password);
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}
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// if given password contains non-ascii chars AND we can not authenticate with it
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if (isset($username) && isset($password) &&
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(preg_match('/[^\x20-\x7F]/', $password) || strpos($password, '\\x') !== false) &&
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!$GLOBALS['egw']->auth->authenticate($username, $password, 'text'))
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{
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// replace \x encoded non-ascii chars in password, as they are used eg. by Thunderbird for German umlauts
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if (strpos($password, '\\x') !== false)
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{
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$password = preg_replace_callback('/\\\\x([0-9A-F]{2})/i', function($matches){
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return chr(hexdec($matches[1]));
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}, $password);
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}
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// try translating the password from iso-8859-1 to utf-8
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$password = translation::convert($password, 'iso-8859-1');
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//error_log(__METHOD__."() Fixed non-ascii password of user '$username' from '$_SERVER[PHP_AUTH_PW]' to '$password'");
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}
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// create session without session cookie (session->create(..., true), as we use pseudo sessionid from credentials
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if (!isset($username) || !($sessionid = $GLOBALS['egw']->session->create($username, $password, 'text', true)))
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{
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// if the session class gives a reason why the login failed --> append it to the REALM
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if ($GLOBALS['egw']->session->reason) $realm .= ': '.$GLOBALS['egw']->session->reason;
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header('WWW-Authenticate: Basic realm="'.$realm.'"');// draft-reschke-basicauth-enc-06 adds, accept-charset="'.translation::charset().'"');
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self::digest_header($realm);
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header('HTTP/1.1 401 Unauthorized');
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header('X-WebDAV-Status: 401 Unauthorized', true);
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echo "<html>\n<head>\n<title>401 Unauthorized</title>\n<body>\nAuthorization failed.\n</body>\n</html>\n";
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exit;
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}
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return $sessionid;
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}
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/**
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* Check if digest auth is available for a given realm (and user): do we use cleartext passwords
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*
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* If no user is given, check is NOT authoretive, as we can only check if cleartext passwords are generally used
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*
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* @param string $realm
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* @param string $username =null username or null to only check if we auth agains sql and use plaintext passwords
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* @param string &$user_pw =null stored cleartext password, if $username given AND function returns true
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* @return boolean true if digest auth is available, false otherwise
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*/
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static public function digest_auth_available($realm,$username=null,&$user_pw=null)
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{
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// we currently require plaintext passwords!
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if (!($GLOBALS['egw_info']['server']['auth_type'] == 'sql' && $GLOBALS['egw_info']['server']['sql_encryption_type'] == 'plain') ||
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$GLOBALS['egw_info']['server']['auth_type'] == 'ldap' && $GLOBALS['egw_info']['server']['ldap_encryption_type'] == 'plain')
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{
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if (self::ERROR_LOG) error_log(__METHOD__."('$username') return false (no plaintext passwords used)");
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return false; // no plain-text passwords used
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}
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// check for specific user, if given
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if (!is_null($username) && !(($user_pw = $GLOBALS['egw']->accounts->id2name($username,'account_pwd','u')) ||
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$GLOBALS['egw_info']['server']['auth_type'] == 'sql' && substr($user_pw,0,7) != '{PLAIN}'))
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{
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unset($user_pw);
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if (self::ERROR_LOG) error_log(__METHOD__."('$realm','$username') return false (unknown user or NO plaintext password for user)");
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return false; // user does NOT exist, or has no plaintext passwords (ldap server requires real root_dn or special ACL!)
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}
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if (substr($user_pw,0,7) == '{PLAIN}') $user_pw = substr($user_pw,7);
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if (self::ERROR_LOG)
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{
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$pw = self::ERROR_LOG > 1 ? $user_pw : '**********';
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error_log(__METHOD__."('$realm','$username','$pw') return true");
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}
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return true;
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}
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/**
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* Send header offering digest auth, if it's generally available
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*
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* @param string $realm
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* @param string &$nonce=null on return
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*/
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static public function digest_header($realm,&$nonce=null)
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{
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if (self::digest_auth_available($realm))
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{
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$nonce = uniqid();
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header('WWW-Authenticate: Digest realm="'.$realm.'",qop="auth",nonce="'.$nonce.'",opaque="'.md5($realm).'"');
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if (self::ERROR_LOG) error_log(__METHOD__."() offering digest auth for realm '$realm' using nonce='$nonce'");
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}
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}
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/**
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* Check digest
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*
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* @param string $realm
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* @param string $auth_digest =null default to $_SERVER['PHP_AUTH_DIGEST']
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* @param string &$username on return username
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* @param string &$password on return cleartext password
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* @return boolean true if digest is correct, false otherwise
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*/
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static public function is_valid($realm,$auth_digest=null,&$username=null,&$password=null)
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{
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if (is_null($auth_digest)) $auth_digest = $_SERVER['PHP_AUTH_DIGEST'];
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$data = self::parse_digest($auth_digest);
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if (!$data || !($A1 = self::get_digest_A1($realm,$username=$data['username'],$password=null)))
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{
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error_log(__METHOD__."('$realm','$auth_digest','$username') returning FALSE");
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return false;
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}
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$A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
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$valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);
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if (self::ERROR_LOG) error_log(__METHOD__."('$realm','$auth_digest','$username') response='$data[response]', valid_response='$valid_response' returning ".array2string($data['response'] === $valid_response));
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return $data['response'] === $valid_response;
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}
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/**
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* Calculate the A1 digest hash
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*
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* @param string $realm
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* @param string $username
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* @param string &$password=null password to use or if null, on return stored password
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* @return string|boolean false if $password not given and can NOT be read
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*/
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static private function get_digest_A1($realm,$username,&$password=null)
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{
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$user_pw = null;
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if (empty($username) || empty($realm) || !self::digest_auth_available($realm,$username,$user_pw))
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{
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return false;
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}
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if (is_null($password)) $password = $user_pw;
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$A1 = md5($username . ':' . $realm . ':' . $password);
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if (self::ERROR_LOG > 1) error_log(__METHOD__."('$realm','$username','$password') returning ".array2string($A1));
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return $A1;
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}
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/**
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* Parse the http auth header
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*/
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static public function parse_digest($txt)
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{
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// protect against missing data
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$needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
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$data = array();
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$keys = implode('|', array_keys($needed_parts));
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$matches = null;
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preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]+?)\2|([^\s,]+))@', $txt, $matches, PREG_SET_ORDER);
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foreach ($matches as $m)
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{
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$data[$m[1]] = $m[3] ? $m[3] : $m[4];
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unset($needed_parts[$m[1]]);
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}
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//error_log(__METHOD__."('$txt') returning ".array2string($needed_parts ? false : $data));
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return $needed_parts ? false : $data;
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}
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}
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