mirror of
https://github.com/EGroupware/egroupware.git
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678 lines
24 KiB
PHP
678 lines
24 KiB
PHP
<?php
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/**
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* eGroupWare API - Authentication baseclass
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*
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* @link http://www.egroupware.org
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* @author Ralf Becker <ralfbecker@outdoor-training.de>
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* @author Miles Lott <milos@groupwhere.org>
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* @copyright 2004 by Miles Lott <milos@groupwhere.org>
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* @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License
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* @package api
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* @subpackage authentication
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* @version $Id$
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*/
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// allow to set an application depending authentication type (eg. for syncml, groupdav, ...)
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if (isset($GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']]) &&
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$GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']])
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{
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$GLOBALS['egw_info']['server']['auth_type'] = $GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']];
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}
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if(empty($GLOBALS['egw_info']['server']['auth_type']))
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{
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$GLOBALS['egw_info']['server']['auth_type'] = 'sql';
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}
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//error_log('using auth_type='.$GLOBALS['egw_info']['server']['auth_type'].', currentapp='.$GLOBALS['egw_info']['flags']['currentapp']);
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/**
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* eGroupWare API - Authentication baseclass, password auth and crypt functions
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*
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* Many functions based on code from Frank Thomas <frank@thomas-alfeld.de>
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* which can be seen at http://www.thomas-alfeld.de/frank/
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*
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* Other functions from class.common.inc.php originally from phpGroupWare
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*/
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class auth
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{
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static $error;
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/**
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* Holds instance of backend
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*
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* @var auth_backend
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*/
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private $backend;
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function __construct()
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{
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$backend_class = 'auth_'.$GLOBALS['egw_info']['server']['auth_type'];
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$this->backend = new $backend_class;
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if (!($this->backend instanceof auth_backend))
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{
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throw new egw_exception_assertion_failed("Auth backend class $backend_class is NO auth_backend!");
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}
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}
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/**
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* check_password_age
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* check if users are supposed to change their password every x sdays, then check if password is of old age
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* or the devil-admin reset the users password and forced the user to change his password on next login.
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*
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* @param string $app to know where you are/ or where you want to go
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* @param string $class to know where you are/ or where you want to go
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* @param string $method to know where you are/ or where you want to go
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* @return boolean true if check determined, that you passed the test, otherwise void, as we get redirected
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*/
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static function check_password_age($app='', $class='', $method='')
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{
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// dont check anything for anonymous sessions/ users that are flagged as anonymous
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if (is_object($GLOBALS['egw']->session) && $GLOBALS['egw']->session->session_flags == 'A') return true;
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// some statics (and initialisation to make information and timecalculation a) more readable in conditions b) persistent per request
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// if user has to be warned about an upcomming passwordchange, remember for the session, that he was informed
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static $UserKnowsAboutPwdChange;
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if (is_null($UserKnowsAboutPwdChange)) $UserKnowsAboutPwdChange =& egw_cache::getSession('phpgwapi','auth_UserKnowsAboutPwdChange');
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// retrieve the timestamp regarding the last change of the password from auth system and store it with the session
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static $alpwchange_val;
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static $pwdTsChecked;
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if (is_null($pwdTsChecked) && is_null($alpwchange_val))
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{
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$alpwchange_val =& egw_cache::getSession('phpgwapi','auth_alpwchange_val'); // set that one with the session stored value
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// initalize statics - better readability of conditions
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if (is_null($alpwchange_val))
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{
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$backend_class = 'auth_'.$GLOBALS['egw_info']['server']['auth_type'];
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$backend = new $backend_class;
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// this may change behavior, as it should detect forced PasswordChanges from your Authentication System too.
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// on the other side, if your auth system does not require an forcedPasswordChange, you will not be asked.
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if (method_exists($backend,'getLastPwdChange'))
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{
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$alpwchange_val = $backend->getLastPwdChange($GLOBALS['egw_info']['user']['account_lid']);
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$pwdTsChecked = true;
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}
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// if your authsystem does not provide that information, its likely, that you cannot change your password there,
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// thus checking for expiration, is not needed
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if ($alpwchange_val === false)
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{
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$alpwchange_val = null;
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}
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//error_log(__METHOD__.__LINE__.'#'.$alpwchange_val.'# is null:'.is_null($alpwchange_val).'# is empty:'.empty($alpwchange_val).'# is set:'.isset($alpwchange_val));
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}
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}
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static $passwordAgeBorder;
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static $daysLeftUntilChangeReq;
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// some debug output and develop options to move the horizons and warn levels around
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//$GLOBALS['egw_info']['server']['change_pwd_every_x_days'] =35;
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//$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change']=5;
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//echo egw_time::to('now','ts').'<br>';
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//echo "User changed password at:".egw_time::to($GLOBALS['egw_info']['user'][$alpwchange]).'<br>';
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//echo "User password is ".((egw_time::to('now','ts')-$GLOBALS['egw_info']['user'][$alpwchange])/86400)." days old<br>";
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//echo "Users must change passwords every ".$GLOBALS['egw_info']['server']['change_pwd_every_x_days'].' days ('.($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400).') seconds.<br>';
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//error_log(__METHOD__.__LINE__.'#'.$alpwchange_val.'# is null:'.is_null($alpwchange_val).'# is empty:'.empty($alpwchange_val).'# is set:'.isset($alpwchange_val));
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//echo egw_time::to('now','ts')-($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400).'<br>';
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// if neither timestamp isset return true, nothing to do (exept this means the password is too old)
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if (is_null($alpwchange_val) &&
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empty($GLOBALS['egw_info']['server']['change_pwd_every_x_days'])
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) return true;
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if (is_null($passwordAgeBorder) && $GLOBALS['egw_info']['server']['change_pwd_every_x_days'])
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{
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$passwordAgeBorder = (egw_time::to('now','ts')-($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400));
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}
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if (is_null($daysLeftUntilChangeReq) && $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'])
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{
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// maxage - passwordage = days left until change is required
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$daysLeftUntilChangeReq = ($GLOBALS['egw_info']['server']['change_pwd_every_x_days'] - ((egw_time::to('now','ts')-($alpwchange_val?$alpwchange_val:0))/86400));
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}
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//echo "Warn about the upcomming change ".$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'].' days before that time is reached<br>';
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//$result = $GLOBALS['egw_info']['server']['change_pwd_every_x_days'] - $daysLeftUntilChangeReq;
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//echo $GLOBALS['egw_info']['server']['change_pwd_every_x_days'].' - '.$daysLeftUntilChangeReq.'='. $result.'<br>';
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if (!($app == 'preferences' && $class == 'uipassword' && $method=='change') &&
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(
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($GLOBALS['egw_info']['server']['change_pwd_every_x_days'] &&
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($GLOBALS['egw_info']['user']['apps']['preferences'] || $GLOBALS['egw_info']['user']['apps']['password']) &&
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(
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($passwordAgeBorder > $alpwchange_val) ||
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(
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$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] &&
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$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] > $daysLeftUntilChangeReq
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)
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)
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) || $alpwchange_val==0
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)
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)
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{
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if ($GLOBALS['egw']->acl->check('nopasswordchange', 1, 'preferences')) return true; // user has no rights to change password
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if ($UserKnowsAboutPwdChange === true && !($passwordAgeBorder > $alpwchange_val || $alpwchange_val==0)) return true; // user has already been informed about the upcomming password expiration
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if (!is_null($alpwchange_val))
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{
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if ($alpwchange_val == 0)
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{
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$message = lang('an admin required that you must change your password upon login.');
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}
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elseif (($passwordAgeBorder < $alpwchange_val) ||
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(
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$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] &&
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$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] > $daysLeftUntilChangeReq &&
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$daysLeftUntilChangeReq > 0
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)
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)
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{
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$UserKnowsAboutPwdChange = true;
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$message = lang('your password is about to expire in %1 days, you may change your password now',round($daysLeftUntilChangeReq));
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}
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elseif ($passwordAgeBorder > $alpwchange_val && $alpwchange_val > 0)
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{
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error_log(__METHOD__.' Password of '.$GLOBALS['egw_info']['user']['account_lid'].' ('.$GLOBALS['egw_info']['user']['account_fullname'].') is of old age.'.array2string(array(
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'ts'=> $alpwchange_val,
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'date'=>egw_time::to($alpwchange_val))));
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$message = lang('it has been more then %1 days since you changed your password',$GLOBALS['egw_info']['server']['change_pwd_every_x_days']);
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}
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if ($GLOBALS['egw_info']['user']['apps']['password']) egw::redirect_link('/preferences/password.php',array('message'=>$message));
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egw::redirect_link('/index.php',array('menuaction'=>'preferences.uipassword.change','message'=>$message));
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}
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}
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return true;
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}
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/**
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* fetch the last pwd change for the user
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*
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* @param string $username username of account to authenticate
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* @return mixed false or shadowlastchange*24*3600
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*/
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function getLastPwdChange($username)
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{
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if (method_exists($this->backend,'getLastPwdChange')) return $this->backend->getLastPwdChange($username);
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return false;
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}
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/**
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* changes account_lastpwd_change in ldap datababse
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*
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* @param int $account_id account id of user whose passwd should be changed
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* @param string $passwd must be cleartext, usually not used, but may be used to authenticate as user to do the change -> ldap
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* @param int $lastpwdchange must be a unixtimestamp
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* @return boolean true if account_lastpwd_change successful changed, false otherwise
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*/
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function setLastPwdChange($account_id=0, $passwd=NULL, $lastpwdchange=NULL)
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{
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if (method_exists($this->backend,'setLastPwdChange')) return $this->backend->setLastPwdChange($account_id, $passwd, $lastpwdchange);
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return false;
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}
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/**
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* password authentication against password stored in sql datababse
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*
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* @param string $username username of account to authenticate
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* @param string $passwd corresponding password
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* @param string $passwd_type='text' 'text' for cleartext passwords (default)
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* @return boolean true if successful authenticated, false otherwise
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*/
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function authenticate($username, $passwd, $passwd_type='text')
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{
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return $this->backend->authenticate($username, $passwd, $passwd_type);
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}
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/**
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* changes password in sql datababse
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*
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* @param string $old_passwd must be cleartext
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* @param string $new_passwd must be cleartext
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* @param int $account_id account id of user whose passwd should be changed
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* @return boolean true if password successful changed, false otherwise
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*/
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function change_password($old_passwd, $new_passwd, $account_id=0)
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{
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return $this->backend->change_password($old_passwd, $new_passwd, $account_id);
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}
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/**
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* return a random string of letters [0-9a-zA-Z] of size $size
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*
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* @param $size int-size of random string to return
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*/
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static function randomstring($size)
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{
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static $random_char = array(
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'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f',
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'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
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'w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L',
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'M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
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);
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$s = '';
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for ($i=0; $i<$size; $i++)
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{
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$s .= $random_char[mt_rand(1,61)];
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}
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return $s;
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}
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/**
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* encrypt password
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*
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* uses the encryption type set in setup and calls the appropriate encryption functions
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*
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* @param $password password to encrypt
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*/
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static function encrypt_password($password,$sql=False)
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{
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if($sql)
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{
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return self::encrypt_sql($password);
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}
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return self::encrypt_ldap($password);
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}
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/**
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* compares an encrypted password
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*
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* encryption type set in setup and calls the appropriate encryption functions
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*
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* @param string $cleartext cleartext password
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* @param string $encrypted encrypted password, can have a {hash} prefix, which overrides $type
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* @param string $type_i type of encryption
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* @param string $username used as optional key of encryption for md5_hmac
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* @param string &$type=null on return detected type of hash
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* @return boolean
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*/
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static function compare_password($cleartext, $encrypted, $type_in, $username='', &$type=null)
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{
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// allow to specify the hash type to prefix the hash, to easy migrate passwords from ldap
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$type = $type_in;
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$saved_enc = $encrypted;
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if (preg_match('/^\\{([a-z_5]+)\\}(.+)$/i',$encrypted,$matches))
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{
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$type = strtolower($matches[1]);
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$encrypted = $matches[2];
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switch($type) // some hashs are specially "packed" in ldap
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{
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case 'md5':
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$encrypted = implode('',unpack('H*',base64_decode($encrypted)));
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break;
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case 'plain':
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case 'crypt':
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// nothing to do
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break;
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default:
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$encrypted = $saved_enc;
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break;
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}
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}
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elseif($encrypted[0] == '$')
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{
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$type = 'crypt';
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}
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switch($type)
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{
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case 'plain':
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$ret = $cleartext === $encrypted;
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break;
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case 'smd5':
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$ret = self::smd5_compare($cleartext,$encrypted);
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break;
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case 'sha':
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$ret = self::sha_compare($cleartext,$encrypted);
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break;
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case 'ssha':
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$ret = self::ssha_compare($cleartext,$encrypted);
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break;
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case 'crypt':
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case 'des':
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case 'md5_crypt':
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case 'blowish_crypt': // was for some time a typo in setup
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case 'blowfish_crypt':
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case 'ext_crypt':
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case 'sha256_crypt':
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case 'sha512_crypt':
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$ret = self::crypt_compare($cleartext, $encrypted, $type);
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break;
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case 'md5_hmac':
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$ret = self::md5_hmac_compare($cleartext,$encrypted,$username);
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break;
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default:
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$type = 'md5';
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// fall through
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case 'md5':
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$ret = md5($cleartext) === $encrypted;
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break;
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}
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//error_log(__METHOD__."('$cleartext', '$encrypted', '$type_in', '$username') type='$type' returning ".array2string($ret));
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return $ret;
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}
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/**
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* Parameters used for crypt: const name, salt prefix, len of random salt, postfix
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*
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* @var array
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*/
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static $crypt_params = array( //
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'crypt' => array('CRYPT_STD_DES', '', 2, ''),
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'ext_crypt' => array('CRYPT_EXT_DES', '_J9..', 4, ''),
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'md5_crypt' => array('CRYPT_MD5', '$1$', 8, '$'),
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//'old_blowfish_crypt' => array('CRYPT_BLOWFISH', '$2$', 13, ''), // old blowfish hash not in line with php.net docu, but could be in use
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'blowfish_crypt' => array('CRYPT_BLOWFISH', '$2a$12$', 22, ''), // $2a$12$ = 2^12 = 4096 rounds
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'sha256_crypt' => array('CRYPT_SHA256', '$5$', 16, '$'), // no "round=N$" --> default of 5000 rounds
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'sha512_crypt' => array('CRYPT_SHA512', '$6$', 16, '$'), // no "round=N$" --> default of 5000 rounds
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);
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/**
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* compare crypted passwords for authentication whether des,ext_des,md5, or blowfish crypt
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*
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* @param string $form_val user input value for comparison
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* @param string $db_val stored value / hash (from database)
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* @param string &$type detected crypt type on return
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* @return boolean True on successful comparison
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*/
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static function crypt_compare($form_val, $db_val, &$type)
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{
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// detect type of hash by salt part of $db_val
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list($first, $dollar, $salt, $salt2) = explode('$', $db_val);
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foreach(self::$crypt_params as $type => $params)
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{
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list(,$prefix, $random, $postfix) = $params;
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list(,$d) = explode('$', $prefix);
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if ($dollar === $d || !$dollar && ($first[0] === $prefix[0] || $first[0] !== '_' && !$prefix))
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{
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$len = !$postfix ? strlen($prefix)+$random : strlen($prefix.$salt.$postfix);
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// sha(256|512) might contain options, explicit $rounds=N$ prefix in salt
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if (($type == 'sha256_crypt' || $type == 'sha512_crypt') && substr($salt, 0, 7) === 'rounds=')
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{
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$len += strlen($salt2)+1;
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}
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break;
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}
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}
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$salt = substr($db_val, 0, $len);
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$new_hash = crypt($form_val, $salt);
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//error_log(__METHOD__."('$form_val', '$db_val') type=$type --> len=$len --> salt='$salt' --> new_hash='$new_hash' returning ".array2string($db_val === $new_hash));
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return $db_val === $new_hash;
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}
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/**
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* encrypt password for ldap
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*
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* uses the encryption type set in setup and calls the appropriate encryption functions
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*
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* @param $password password to encrypt
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* @param $type=null default to $GLOBALS['egw_info']['server']['ldap_encryption_type']
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* @return string
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*/
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static function encrypt_ldap($password, $type=null)
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{
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if (is_null($type)) $type = $GLOBALS['egw_info']['server']['ldap_encryption_type'];
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$salt = '';
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switch(strtolower($type))
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{
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default: // eg. setup >> config never saved
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case 'des':
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case 'blowish_crypt': // was for some time a typo in setup
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$type = $type == 'blowish_crypt' ? 'blowfish_crypt' : 'crypt';
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// fall through
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case 'crypt':
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case 'sha256_crypt':
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case 'sha512_crypt':
|
|
case 'blowfish_crypt':
|
|
case 'md5_crypt':
|
|
case 'ext_crypt':
|
|
list($const, $prefix, $len, $postfix) = self::$crypt_params[$type];
|
|
if(defined($const) && constant($const) == 1)
|
|
{
|
|
$salt = $prefix.self::randomstring($len).$postfix;
|
|
$e_password = '{crypt}'.crypt($password, $salt);
|
|
break;
|
|
}
|
|
self::$error = 'no '.str_replace('_', ' ', $type);
|
|
$e_password = false;
|
|
break;
|
|
case 'md5':
|
|
/* New method taken from the openldap-software list as recommended by
|
|
* Kervin L. Pierre" <kervin@blueprint-tech.com>
|
|
*/
|
|
$e_password = '{md5}' . base64_encode(pack("H*",md5($password)));
|
|
break;
|
|
case 'smd5':
|
|
$salt = self::randomstring(16);
|
|
$hash = md5($password . $salt, true);
|
|
$e_password = '{SMD5}' . base64_encode($hash . $salt);
|
|
break;
|
|
case 'sha':
|
|
$e_password = '{SHA}' . base64_encode(sha1($password,true));
|
|
break;
|
|
case 'ssha':
|
|
$salt = self::randomstring(16);
|
|
$hash = sha1($password . $salt, true);
|
|
$e_password = '{SSHA}' . base64_encode($hash . $salt);
|
|
break;
|
|
case 'plain':
|
|
// if plain no type is prepended
|
|
$e_password = $password;
|
|
break;
|
|
}
|
|
//error_log(__METHOD__."('$password', ".array2string($type).") returning ".array2string($e_password).(self::$error ? ' error='.self::$error : ''));
|
|
return $e_password;
|
|
}
|
|
|
|
/**
|
|
* Create a password for storage in the accounts table
|
|
*
|
|
* @param string $password
|
|
* @return string hash
|
|
*/
|
|
static function encrypt_sql($password)
|
|
{
|
|
/* Grab configured type, or default to md5() (old method) */
|
|
$type = @$GLOBALS['egw_info']['server']['sql_encryption_type'] ?
|
|
strtolower($GLOBALS['egw_info']['server']['sql_encryption_type']) : 'md5';
|
|
|
|
switch($type)
|
|
{
|
|
case 'plain':
|
|
// since md5 is the default, type plain must be prepended, for eGroupware to understand
|
|
$e_password = '{PLAIN}'.$password;
|
|
break;
|
|
|
|
case 'md5':
|
|
/* This is the old standard for password storage in SQL */
|
|
$e_password = md5($password);
|
|
break;
|
|
|
|
// all other types are identical to ldap, so no need to doublicate the code here
|
|
case 'des':
|
|
case 'blowish_crypt': // was for some time a typo in setup
|
|
case 'crypt':
|
|
case 'sha256_crypt':
|
|
case 'sha512_crypt':
|
|
case 'blowfish_crypt':
|
|
case 'md5_crypt':
|
|
case 'ext_crypt':
|
|
case 'smd5':
|
|
case 'sha':
|
|
case 'ssha':
|
|
$e_password = self::encrypt_ldap($password, $type);
|
|
break;
|
|
|
|
default:
|
|
self::$error = 'no valid encryption available';
|
|
$e_password = false;
|
|
break;
|
|
}
|
|
//error_log(__METHOD__."('$password') using '$type' returning ".array2string($e_password).(self::$error ? ' error='.self::$error : ''));
|
|
return $e_password;
|
|
}
|
|
|
|
/**
|
|
* Checks if a given password is "safe"
|
|
*
|
|
* @param string $login
|
|
* @abstract atm a simple check in length, #digits, #uppercase and #lowercase
|
|
* could be made more safe using e.g. pecl library cracklib
|
|
* but as pecl dosn't run on any platform and isn't GPL'd
|
|
* i haven't implemented it yet
|
|
* Windows compatible check is: 7 char lenth, 1 Up, 1 Low, 1 Num and 1 Special
|
|
* @author cornelius weiss <egw at von-und-zu-weiss.de>
|
|
* @return mixed false if password is considered "safe" or a string $message if "unsafe"
|
|
*/
|
|
static function crackcheck($passwd,$reqstrength=5)
|
|
{
|
|
if (!preg_match('/.{'. ($noc=7). ',}/',$passwd))
|
|
{
|
|
$message[] = lang('Password must have at least %1 characters',$noc). '<br>';
|
|
}
|
|
else
|
|
{
|
|
$strength++;
|
|
}
|
|
if(!preg_match('/(.*\d.*){'. ($non=1). ',}/',$passwd))
|
|
{
|
|
$message[] = lang('Password must contain at least %1 numbers',$non). '<br>';
|
|
}
|
|
else
|
|
{
|
|
$strength++;
|
|
}
|
|
if(!preg_match('/(.*[[:upper:]].*){'. ($nou=1). ',}/',$passwd))
|
|
{
|
|
$message[] = lang('Password must contain at least %1 uppercase letters',$nou). '<br>';
|
|
}
|
|
else
|
|
{
|
|
$strength++;
|
|
}
|
|
if(!preg_match('/(.*[[:lower:]].*){'. ($nol=1). ',}/',$passwd))
|
|
{
|
|
$message[] = lang('Password must contain at least %1 lowercase letters',$nol). '<br>';
|
|
}
|
|
else
|
|
{
|
|
$strength++;
|
|
}
|
|
if(!preg_match('/(.*[\\!"#$%&\'()*+,-.\/:;<=>?@\[\]\^_ {|}~`].*){'. ($nol=1). ',}/',$passwd))
|
|
{
|
|
$message[] = lang('Password must contain at least %1 special characters',$nol). '<br>';
|
|
}
|
|
else
|
|
{
|
|
$strength++;
|
|
}
|
|
if (count($message)>0 && $reqstrength>$strength)
|
|
{
|
|
$outmessage = lang('Your Password does not meet the required strength.<br> You must meet %1 criteria. You met only %2 criteria. <br>Your Password failed the following criteria:',$reqstrength,$strength);
|
|
$outmessage .= '<br>'.implode(' ',$message);
|
|
}
|
|
else
|
|
{
|
|
$outmessage =false;
|
|
}
|
|
return $outmessage ? $outmessage : false;
|
|
}
|
|
|
|
/**
|
|
* compare SMD5-encrypted passwords for authentication
|
|
*
|
|
* @param string $form_val user input value for comparison
|
|
* @param string $db_val stored value (from database)
|
|
* @return boolean True on successful comparison
|
|
*/
|
|
static function smd5_compare($form_val,$db_val)
|
|
{
|
|
/* Start with the first char after {SMD5} */
|
|
$hash = base64_decode(substr($db_val,6));
|
|
|
|
/* SMD5 hashes are 16 bytes long */
|
|
$orig_hash = cut_bytes($hash, 0, 16); // binary string need to use cut_bytes, not mb_substr(,,'utf-8')!
|
|
$salt = cut_bytes($hash, 16);
|
|
|
|
$new_hash = md5($form_val . $salt,true);
|
|
//echo '<br> DB: ' . base64_encode($orig_hash) . '<br>FORM: ' . base64_encode($new_hash);
|
|
|
|
return strcmp($orig_hash,$new_hash) == 0;
|
|
}
|
|
|
|
/**
|
|
* compare SHA-encrypted passwords for authentication
|
|
*
|
|
* @param string $form_val user input value for comparison
|
|
* @param string $db_val stored value (from database)
|
|
* @return boolean True on successful comparison
|
|
*/
|
|
static function sha_compare($form_val,$db_val)
|
|
{
|
|
/* Start with the first char after {SHA} */
|
|
$hash = base64_decode(substr($db_val,5));
|
|
$new_hash = sha1($form_val,true);
|
|
//echo '<br> DB: ' . base64_encode($orig_hash) . '<br>FORM: ' . base64_encode($new_hash);
|
|
|
|
return strcmp($hash,$new_hash) == 0;
|
|
}
|
|
|
|
/**
|
|
* compare SSHA-encrypted passwords for authentication
|
|
*
|
|
* @param string $form_val user input value for comparison
|
|
* @param string $db_val stored value (from database)
|
|
* @return boolean True on successful comparison
|
|
*/
|
|
static function ssha_compare($form_val,$db_val)
|
|
{
|
|
/* Start with the first char after {SSHA} */
|
|
$hash = base64_decode(substr($db_val, 6));
|
|
|
|
// SHA-1 hashes are 160 bits long
|
|
$orig_hash = cut_bytes($hash, 0, 20); // binary string need to use cut_bytes, not mb_substr(,,'utf-8')!
|
|
$salt = cut_bytes($hash, 20);
|
|
$new_hash = sha1($form_val . $salt,true);
|
|
|
|
//error_log(__METHOD__."('$form_val', '$db_val') hash='$hash', orig_hash='$orig_hash', salt='$salt', new_hash='$new_hash' returning ".array2string(strcmp($orig_hash,$new_hash) == 0));
|
|
return strcmp($orig_hash,$new_hash) == 0;
|
|
}
|
|
|
|
/**
|
|
* compare md5_hmac-encrypted passwords for authentication (see RFC2104)
|
|
*
|
|
* @param string $form_val user input value for comparison
|
|
* @param string $db_val stored value (from database)
|
|
* @param string $key key for md5_hmac-encryption (username for imported smf users)
|
|
* @return boolean True on successful comparison
|
|
*/
|
|
static function md5_hmac_compare($form_val,$db_val,$key)
|
|
{
|
|
$key = str_pad(strlen($key) <= 64 ? $key : pack('H*', md5($key)), 64, chr(0x00));
|
|
$md5_hmac = md5(($key ^ str_repeat(chr(0x5c), 64)) . pack('H*', md5(($key ^ str_repeat(chr(0x36), 64)). $form_val)));
|
|
|
|
return strcmp($md5_hmac,$db_val) == 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Interface for authentication backend
|
|
*/
|
|
interface auth_backend
|
|
{
|
|
/**
|
|
* password authentication against password stored in sql datababse
|
|
*
|
|
* @param string $username username of account to authenticate
|
|
* @param string $passwd corresponding password
|
|
* @param string $passwd_type='text' 'text' for cleartext passwords (default)
|
|
* @return boolean true if successful authenticated, false otherwise
|
|
*/
|
|
function authenticate($username, $passwd, $passwd_type='text');
|
|
|
|
/**
|
|
* changes password in sql datababse
|
|
*
|
|
* @param string $old_passwd must be cleartext
|
|
* @param string $new_passwd must be cleartext
|
|
* @param int $account_id account id of user whose passwd should be changed
|
|
* @return boolean true if password successful changed, false otherwise
|
|
*/
|
|
function change_password($old_passwd, $new_passwd, $account_id=0);
|
|
}
|