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egroupware/phpgwapi/inc/class.auth.inc.php

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<?php
/**
* eGroupWare API - Authentication baseclass
*
* @link http://www.egroupware.org
* @author Miles Lott <milos@groupwhere.org>
* @copyright 2004 by Miles Lott <milos@groupwhere.org>
* @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License
* @package api
* @subpackage authentication
* @version $Id$
*/
if(empty($GLOBALS['egw_info']['server']['auth_type']))
{
$GLOBALS['egw_info']['server']['auth_type'] = 'sql';
}
include(EGW_API_INC.'/class.auth_'.$GLOBALS['egw_info']['server']['auth_type'].'.inc.php');
/**
* eGroupWare API - Authentication baseclass, password auth and crypt functions
*
* Many functions based on code from Frank Thomas <frank@thomas-alfeld.de>
* which can be seen at http://www.thomas-alfeld.de/frank/
*
* Other functions from class.common.inc.php originally from phpGroupWare
*/
class auth extends auth_
{
static $error;
/**
* 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 $password password to encrypt
*/
function encrypt_password($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 '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':
if(!function_exists('mhash'))
{
return False;
}
$salt = self::randomstring(8);
$hash = mhash(MHASH_MD5, $password . $salt);
$e_password = '{SMD5}' . base64_encode($hash . $salt);
break;
case 'sha':
if(!function_exists('mhash'))
{
return False;
}
$e_password = '{SHA}' . base64_encode(mhash(MHASH_SHA1, $password));
break;
case 'ssha':
if(!function_exists('mhash'))
{
return False;
}
$salt = self::randomstring(8);
$hash = mhash(MHASH_SHA1, $password . $salt);
$e_password = '{SSHA}' . base64_encode($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':
if(!function_exists('mhash'))
{
return False;
}
$salt = self::randomstring(8);
$hash = mhash(MHASH_MD5, $password . $salt);
return '{SMD5}' . base64_encode($hash . $salt);
case 'sha':
if(!function_exists('mhash'))
{
self::$error = 'no sha';
return False;
}
return '{SHA}' . base64_encode(mhash(MHASH_SHA1,$password));
case 'ssha':
if(!function_exists('mhash'))
{
self::$error = 'no ssha';
return False;
}
$salt = self::randomstring(8);
$hash = mhash(MHASH_SHA1, $password . $salt);
return '{SSHA}' . base64_encode($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 <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)
{
if (!preg_match('/.{'. ($noc=7). ',}/',$passwd))
{
$message = lang('Password must have at least %1 characters',$noc). '<br>';
}
if(!preg_match('/(.*\d.*){'. ($non=1). ',}/',$passwd))
{
$message .= lang('Password must contain at least %1 numbers',$non). '<br>';
}
if(!preg_match('/(.*[[:upper:]].*){'. ($nou=1). ',}/',$passwd))
{
$message .= lang('Password must contain at least %1 uppercase letters',$nou). '<br>';
}
if(!preg_match('/(.*[[:lower:]].*){'. ($nol=1). ',}/',$passwd))
{
$message .= lang('Password must contain at least %1 lowercase letters',$nol). '<br>';
}
if(!preg_match('/(.*[\\!"#$%&\'()*+,-.\/:;<=>?@\[\]\^_ {|}~`].*){'. ($nol=1). ',}/',$passwd))
{
$message .= lang('Password must contain at least %1 special characters',$nol). '<br>';
}
return $message ? $message : 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);
$new_hash = mhash(MHASH_MD5,$form_val . $salt);
//echo '<br> DB: ' . base64_encode($orig_hash) . '<br>FORM: ' . base64_encode($new_hash);
if(strcmp($orig_hash,$new_hash) == 0)
{
return True;
}
return False;
}
/**
* 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));
$new_hash = mhash(MHASH_SHA1,$form_val);
//echo '<br> DB: ' . base64_encode($orig_hash) . '<br>FORM: ' . base64_encode($new_hash);
if(strcmp($hash,$new_hash) == 0)
{
return True;
}
return False;
}
/**
* 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 = mhash(MHASH_SHA1, $form_val . $salt);
if(strcmp($orig_hash,$new_hash) == 0)
{
return True;
}
return False;
}
/**
* 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, $salt);
if(strcmp($db_val,$new_hash) == 0)
{
return True;
}
return False;
}
/**
* 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)). $form_val)));
if(strcmp($md5_hmac,$db_val) == 0)
{
return True;
}
return False;
}
}
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