* @author Miles Lott * @copyright 2004 by Miles Lott * @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License * @package api * @subpackage authentication * @version $Id$ */ // allow to set an application depending authentication type (eg. for syncml, groupdav, ...) if (isset($GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']]) && $GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']]) { $GLOBALS['egw_info']['server']['auth_type'] = $GLOBALS['egw_info']['server']['auth_type_'.$GLOBALS['egw_info']['flags']['currentapp']]; } if(empty($GLOBALS['egw_info']['server']['auth_type'])) { $GLOBALS['egw_info']['server']['auth_type'] = 'sql'; } //error_log('using auth_type='.$GLOBALS['egw_info']['server']['auth_type'].', currentapp='.$GLOBALS['egw_info']['flags']['currentapp']); /** * eGroupWare API - Authentication baseclass, password auth and crypt functions * * Many functions based on code from Frank Thomas * which can be seen at http://www.thomas-alfeld.de/frank/ * * Other functions from class.common.inc.php originally from phpGroupWare */ class auth { static $error; /** * Holds instance of backend * * @var auth_backend */ private $backend; function __construct() { $backend_class = 'auth_'.$GLOBALS['egw_info']['server']['auth_type']; $this->backend = new $backend_class; if (!is_a($this->backend,'auth_backend')) { throw new egw_exception_assertion_failed("Auth backend class $backend_class is NO auth_backend!"); } } /** * check_password_age * check if users are supposed to change their password every x sdays, then check if password is of old age * or the devil-admin reset the users password and forced the user to change his password on next login. * * @param string $app to know where you are/ or where you want to go * @param string $class to know where you are/ or where you want to go * @param string $method to know where you are/ or where you want to go * @return boolean true if check determined, that you passed the test, otherwise void, as we get redirected */ static function check_password_age($app='', $class='', $method='') { // dont check anything for anonymous sessions/ users that are flagged as anonymous if (is_object($GLOBALS['egw']->session) && $GLOBALS['egw']->session->session_flags == 'A') return true; static $UserKnowsAboutPwdChange; if (is_null($UserKnowsAboutPwdChange)) $UserKnowsAboutPwdChange =& egw_cache::getSession('auth_UserKnowsAboutPwdChange','phpgwapi'); // some statics to make information and timecalculation a) more readable in conditions b) persistent per request static $alpwchange_val; static $passwordAgeBorder; static $daysLeftUntilChangeReq; // current style name for account last password change timestamp $alpwchange='account_lastpwd_change'; // some debug output and develop options to move the horizons and warn levels around //$GLOBALS['egw_info']['server']['change_pwd_every_x_days'] =35; //$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change']=5; //echo egw_time::to('now','ts').'
'; //echo "User changed password at:".egw_time::to($GLOBALS['egw_info']['user'][$alpwchange]).'
'; //echo "User password is ".((egw_time::to('now','ts')-$GLOBALS['egw_info']['user'][$alpwchange])/86400)." days old
"; //echo "Users must change passwords every ".$GLOBALS['egw_info']['server']['change_pwd_every_x_days'].' days ('.($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400).') seconds.
'; //echo egw_time::to('now','ts')-($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400).'
'; // if neither timestamp isset return true, nothing to do (exept this means the password is too old) if (!isset($GLOBALS['egw_info']['user']['account_lastpasswd_change']) && !isset($GLOBALS['egw_info']['user'][$alpwchange]) && empty($GLOBALS['egw_info']['server']['change_pwd_every_x_days']) ) return true; if ($GLOBALS['egw_info']['user']['account_lastpasswd_change'] && !$GLOBALS['egw_info']['user'][$alpwchange]) { // use old style names, as the current one seems not to be set. $alpwchange = 'account_lastpasswd_change'; } // initalize statics - better readability of conditions if (is_null($alpwchange_val)) { $backend_class = 'auth_'.$GLOBALS['egw_info']['server']['auth_type']; $backend = new $backend_class; // this may change behavior, as it should detect forced PasswordChanges from your Authentication System too. // on the other side, if your auth system does not require an forcedPasswordChange, you will not be asked. if (method_exists($backend,'getLastPwdChange')) $alpwchange_val = $backend->getLastPwdChange($GLOBALS['egw_info']['user']['account_lid']); if (is_null($alpwchange_val) || $alpwchange_val === false) $alpwchange_val = $GLOBALS['egw_info']['user'][$alpwchange]; } if (is_null($passwordAgeBorder) && $GLOBALS['egw_info']['server']['change_pwd_every_x_days']) { $passwordAgeBorder = (egw_time::to('now','ts')-($GLOBALS['egw_info']['server']['change_pwd_every_x_days']*86400)); } if (is_null($daysLeftUntilChangeReq) && $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change']) { // maxage - passwordage = days left until change is required $daysLeftUntilChangeReq = ($GLOBALS['egw_info']['server']['change_pwd_every_x_days'] - ((egw_time::to('now','ts')-$alpwchange_val)/86400)); } //echo "Warn about the upcomming change ".$GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'].' days before that time is reached
'; //$result = $GLOBALS['egw_info']['server']['change_pwd_every_x_days'] - $daysLeftUntilChangeReq; //echo $GLOBALS['egw_info']['server']['change_pwd_every_x_days'].' - '.$daysLeftUntilChangeReq.'='. $result.'
'; if (!($app == 'preferences' && $class == 'uipassword' && $method=='change') && ( ($GLOBALS['egw_info']['server']['change_pwd_every_x_days'] && ($GLOBALS['egw_info']['user']['apps']['preferences'] || $GLOBALS['egw_info']['user']['apps']['password']) && ( ($passwordAgeBorder > $alpwchange_val) || ( $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] && $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] > $daysLeftUntilChangeReq ) ) ) || $alpwchange_val==0 ) ) { if ($GLOBALS['egw']->acl->check('nopasswordchange', 1, 'preferences')) return true; // user has no rights to change password if ($UserKnowsAboutPwdChange === true && !($passwordAgeBorder > $alpwchange_val || $alpwchange_val==0)) return true; // user has already been informed about the upcomming password expiration if ($alpwchange_val == 0) { $message = lang('an admin required that you must change your password upon login.'); } elseif (($passwordAgeBorder < $alpwchange_val) || ( $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] && $GLOBALS['egw_info']['server']['warn_about_upcoming_pwd_change'] > $daysLeftUntilChangeReq && $daysLeftUntilChangeReq > 0 ) ) { $UserKnowsAboutPwdChange = true; $message = lang('your password is about to expire in %1 days, you may change your password now',round($daysLeftUntilChangeReq)); } elseif ($passwordAgeBorder > $alpwchange_val && $alpwchange_val > 0) { error_log(__METHOD__.' Password of '.$GLOBALS['egw_info']['user']['account_lid'].' ('.$GLOBALS['egw_info']['user']['account_fullname'].') is of old age.'.array2string(array( 'ts'=>$GLOBALS['egw_info']['user']['account_lastpwd_change'], 'date'=>egw_time::to($GLOBALS['egw_info']['user']['account_lastpwd_change'])))); $message = lang('it has been more then %1 days since you changed your password',$GLOBALS['egw_info']['server']['change_pwd_every_x_days']); } if ($GLOBALS['egw_info']['user']['apps']['password']) egw::redirect_link('/preferences/password.php',array('message'=>$message)); egw::redirect_link('/index.php',array('menuaction'=>'preferences.uipassword.change','message'=>$message)); } return true; } /** * 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') { return $this->backend->authenticate($username, $passwd, $passwd_type); } /** * 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) { return $this->backend->change_password($old_passwd, $new_passwd, $account_id); } /** * return a random string of size $size * * @param $size int-size of random string to return */ static function randomstring($size) { $s = ''; $random_char = array( '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f', 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', 'w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L', 'M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' ); for ($i=0; $i<$size; $i++) { $s .= $random_char[mt_rand(1,61)]; } return $s; } /** * encrypt password * * uses the encryption type set in setup and calls the appropriate encryption functions * * @param $password password to encrypt */ static function encrypt_password($password,$sql=False) { if($sql) { return self::encrypt_sql($password); } return self::encrypt_ldap($password); } /** * compares an encrypted password * * encryption type set in setup and calls the appropriate encryption functions * * @param $cleartext cleartext password * @param $encrypted encrypted password, can have a {hash} prefix, which overrides $type * @param $type type of encryption * @param $username used as optional key of encryption for md5_hmac */ static function compare_password($cleartext,$encrypted,$type,$username='') { // allow to specify the hash type to prefix the hash, to easy migrate passwords from ldap $saved_enc = $encrypted; if (preg_match('/^\\{([a-z_5]+)\\}(.+)$/i',$encrypted,$matches)) { $type = strtolower($matches[1]); $encrypted = $matches[2]; switch($type) // some hashs are specially "packed" in ldap { case 'md5': $encrypted = implode('',unpack('H*',base64_decode($encrypted))); break; case 'plain': case 'crypt': // nothing to do break; default: $encrypted = $saved_enc; // ToDo: the others ... } } switch($type) { case 'plain': if(strcmp($cleartext,$encrypted) == 0) { return True; } return False; case 'smd5': return self::smd5_compare($cleartext,$encrypted); case 'sha': return self::sha_compare($cleartext,$encrypted); case 'ssha': return self::ssha_compare($cleartext,$encrypted); case 'crypt': case 'md5_crypt': case 'blowfish_crypt': case 'ext_crypt': return self::crypt_compare($cleartext,$encrypted,$type); case 'md5_hmac': return self::md5_hmac_compare($cleartext,$encrypted,$username); case 'md5': default: return strcmp(md5($cleartext),$encrypted) == 0 ? true : false; } } /** * encrypt password for ldap * * uses the encryption type set in setup and calls the appropriate encryption functions * * @param $password password to encrypt */ static function encrypt_ldap($password) { $type = strtolower($GLOBALS['egw_info']['server']['ldap_encryption_type']); $salt = ''; switch($type) { default: // eg. setup >> config never saved case 'des': $salt = self::randomstring(2); $_password = crypt($password, $salt); $e_password = '{crypt}'.$_password; break; case 'blowfish_crypt': if(@defined('CRYPT_BLOWFISH') && CRYPT_BLOWFISH == 1) { $salt = '$2$' . self::randomstring(13); $e_password = '{crypt}'.crypt($password,$salt); break; } self::$error = 'no blowfish crypt'; break; case 'md5_crypt': if(@defined('CRYPT_MD5') && CRYPT_MD5 == 1) { $salt = '$1$' . self::randomstring(9); $e_password = '{crypt}'.crypt($password,$salt); break; } self::$error = 'no md5 crypt'; break; case 'ext_crypt': if(@defined('CRYPT_EXT_DES') && CRYPT_EXT_DES == 1) { $salt = self::randomstring(9); $e_password = '{crypt}'.crypt($password,$salt); break; } self::$error = 'no ext crypt'; break; case 'md5': /* New method taken from the openldap-software list as recommended by * Kervin L. Pierre" */ $e_password = '{md5}' . base64_encode(pack("H*",md5($password))); break; case 'smd5': $salt = self::randomstring(8); $hash = md5($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(8); $hash = sha1($password . $salt,true); $e_password = '{SSHA}' . base64_encode($hash . $salt); break; case 'plain': // if plain no type is prepended $e_password =$password; break; } return $e_password; } /** * Create an ldap hash from an sql hash * * @param string $hash */ static function hash_sql2ldap($hash) { switch(strtolower($GLOBALS['egw_info']['server']['sql_encryption_type'])) { case '': // not set sql_encryption_type case 'md5': $hash = '{md5}' . base64_encode(pack("H*",$hash)); break; case 'crypt': $hash = '{crypt}' . $hash; break; case 'plain': $saved_h = $hash; if (preg_match('/^\\{([a-z_5]+)\\}(.+)$/i',$hash,$matches)) { $hash= $matches[2]; } else { $hash = $saved_h; } break; } return $hash; } /** * 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 return '{PLAIN}'.$password; case 'crypt': if(@defined('CRYPT_STD_DES') && CRYPT_STD_DES == 1) { $salt = self::randomstring(2); return crypt($password,$salt); } self::$error = 'no std crypt'; break; case 'blowfish_crypt': if(@defined('CRYPT_BLOWFISH') && CRYPT_BLOWFISH == 1) { $salt = '$2$' . self::randomstring(13); return crypt($password,$salt); } self::$error = 'no blowfish crypt'; break; case 'md5_crypt': if(@defined('CRYPT_MD5') && CRYPT_MD5 == 1) { $salt = '$1$' . self::randomstring(9); return crypt($password,$salt); } self::$error = 'no md5 crypt'; break; case 'ext_crypt': if(@defined('CRYPT_EXT_DES') && CRYPT_EXT_DES == 1) { $salt = self::randomstring(9); return crypt($password,$salt); } self::$error = 'no ext crypt'; break; case 'smd5': $salt = self::randomstring(8); $hash = md5($password . $salt,true); return '{SMD5}' . base64_encode($hash . $salt); case 'sha': return '{SHA}' . base64_encode(sha1($password,true)); case 'ssha': $salt = self::randomstring(8); $hash = sha1($password . $salt,true); return '{SSHA}' . base64_encode($hash . $salt); case 'md5': default: /* This is the old standard for password storage in SQL */ return md5($password); } if (!self::$error) { self::$error = 'no valid encryption available'; } return False; } /** * 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 * @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). '
'; } else { $strength++; } if(!preg_match('/(.*\d.*){'. ($non=1). ',}/',$passwd)) { $message[] = lang('Password must contain at least %1 numbers',$non). '
'; } else { $strength++; } if(!preg_match('/(.*[[:upper:]].*){'. ($nou=1). ',}/',$passwd)) { $message[] = lang('Password must contain at least %1 uppercase letters',$nou). '
'; } else { $strength++; } if(!preg_match('/(.*[[:lower:]].*){'. ($nol=1). ',}/',$passwd)) { $message[] = lang('Password must contain at least %1 lowercase letters',$nol). '
'; } else { $strength++; } if(!preg_match('/(.*[\\!"#$%&\'()*+,-.\/:;<=>?@\[\]\^_ {|}~`].*){'. ($nol=1). ',}/',$passwd)) { $message[] = lang('Password must contain at least %1 special characters',$nol). '
'; } else { $strength++; } if (count($message)>0 && $reqstrength>$strength) { $outmessage = lang('Your Password does not meet the required strength.
You must meet %1 criteria. You met only %2 criteria.
Your Password failed the following criteria:',$reqstrength,$strength); $outmessage .= '
'.implode(' ',$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 */ $orig_hash = substr($hash, 0, 16); $salt = substr($hash, 16); $new_hash = md5($form_val . $salt,true); //echo '
DB: ' . base64_encode($orig_hash) . '
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 '
DB: ' . base64_encode($orig_hash) . '
FORM: ' . base64_encode($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 $orig_hash = substr($hash, 0, 20); $salt = substr($hash, 20); $new_hash = sha1($form_val . $salt,true); return strcmp($orig_hash,$new_hash) == 0; } /** * compare crypted passwords for authentication whether des,ext_des,md5, or blowfish crypt * * @param string $form_val user input value for comparison * @param string $db_val stored value (from database) * @param string $type crypt() type * @return boolean True on successful comparison */ static function crypt_compare($form_val,$db_val,$type) { $saltlen = array( 'blowfish_crypt' => 16, 'md5_crypt' => 12, 'ext_crypt' => 9, 'crypt' => 2 ); // PHP's crypt(): salt + hash // notice: "The encryption type is triggered by the salt argument." $salt = substr($db_val, 0, (int)$saltlen[$type]); $new_hash = crypt($form_val, $salt); return strcmp($db_val,$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); }