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harden ldap auth, by removing \000 bytes, causing passwords to be not empty by php, but empty to c libaries

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This commit is contained in:
Ralf Becker 2015-02-17 22:26:09 +00:00
parent 0fbe4b7ae7
commit ec03148f1a
2 changed files with 29 additions and 22 deletions
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6
phpgwapi/inc/class.auth_ads.inc.php
View File

@ -30,17 +30,19 @@ class auth_ads implements auth_backend
* password authentication * password authentication
* *
* @param string $username username of account to authenticate * @param string $username username of account to authenticate
* @param string $passwd corresponding password * @param string $_passwd corresponding password
* @param string $passwd_type ='text' 'text' for cleartext passwords (default) * @param string $passwd_type ='text' 'text' for cleartext passwords (default)
* @return boolean true if successful authenticated, false otherwise * @return boolean true if successful authenticated, false otherwise
*/ */
function authenticate($username, $passwd, $passwd_type='text') function authenticate($username, $_passwd, $passwd_type='text')
{ {
unset($passwd_type); // not used by required in function signature unset($passwd_type); // not used by required in function signature
if (preg_match('/[()|&=*,<>!~]/',$username)) if (preg_match('/[()|&=*,<>!~]/',$username))
{ {
return False; return False;
} }
// harden ldap auth, by removing \000 bytes, causing passwords to be not empty by php, but empty to c libaries
$passwd = str_replace("\000", '', $_passwd);
$adldap = accounts_ads::get_adldap(); $adldap = accounts_ads::get_adldap();
// bind with username@ads_domain, only if a non-empty password given, in case anonymous search is enabled // bind with username@ads_domain, only if a non-empty password given, in case anonymous search is enabled

39
phpgwapi/inc/class.auth_ldap.inc.php
View File

@ -35,15 +35,18 @@ class auth_ldap implements auth_backend
/** /**
* authentication against LDAP * authentication against LDAP
* *
* @param string $username username of account to authenticate * @param string $_username username of account to authenticate
* @param string $passwd corresponding password * @param string $_passwd corresponding password
* @return boolean true if successful authenticated, false otherwise * @return boolean true if successful authenticated, false otherwise
*/ */
function authenticate($username, $passwd, $passwd_type='text') function authenticate($_username, $_passwd, $passwd_type='text')
{ {
unset($passwd_type); // not used by required by function signature
// allow non-ascii in username & password // allow non-ascii in username & password
$username = translation::convert($username,translation::charset(),'utf-8'); $username = translation::convert($_username,translation::charset(),'utf-8');
$passwd = translation::convert($passwd,translation::charset(),'utf-8'); // harden ldap auth, by removing \000 bytes, causing passwords to be not empty by php, but empty to c libaries
$passwd = str_replace("\000", '', translation::convert($_passwd,translation::charset(),'utf-8'));
if(!$ldap = common::ldapConnect()) if(!$ldap = common::ldapConnect())
{ {
@ -59,8 +62,8 @@ class auth_ldap implements auth_backend
/* find the dn for this uid, the uid is not always in the dn */ /* find the dn for this uid, the uid is not always in the dn */
$attributes = array('uid','dn','givenName','sn','mail','uidNumber','shadowExpire','homeDirectory'); $attributes = array('uid','dn','givenName','sn','mail','uidNumber','shadowExpire','homeDirectory');
$filter = $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)'; $filter = str_replace(array('%user','%domain'),array(ldap::quote($username),$GLOBALS['egw_info']['user']['domain']),
$filter = str_replace(array('%user','%domain'),array(ldap::quote($username),$GLOBALS['egw_info']['user']['domain']),$filter); $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)');
if ($GLOBALS['egw_info']['server']['account_repository'] == 'ldap') if ($GLOBALS['egw_info']['server']['account_repository'] == 'ldap')
{ {
@ -133,6 +136,7 @@ class auth_ldap implements auth_backend
elseif ($GLOBALS['egw_info']['server']['pwd_migration_allowed'] && elseif ($GLOBALS['egw_info']['server']['pwd_migration_allowed'] &&
!empty($GLOBALS['egw_info']['server']['pwd_migration_types'])) !empty($GLOBALS['egw_info']['server']['pwd_migration_types']))
{ {
$matches = null;
// try to query password from ldap server (might fail because of ACL) and check if we need to migrate the hash // try to query password from ldap server (might fail because of ACL) and check if we need to migrate the hash
if (($sri = ldap_search($ldap, $userDN,"(objectclass=*)", array('userPassword'))) && if (($sri = ldap_search($ldap, $userDN,"(objectclass=*)", array('userPassword'))) &&
($values = ldap_get_entries($ldap, $sri)) && isset($values[0]['userpassword'][0]) && ($values = ldap_get_entries($ldap, $sri)) && isset($values[0]['userpassword'][0]) &&
@ -147,7 +151,7 @@ class auth_ldap implements auth_backend
return $ret; return $ret;
} }
} }
if ($this->debug) error_log(__METHOD__."('$username','$password') dn not found or password wrong!"); if ($this->debug) error_log(__METHOD__."('$_username', '$_passwd') dn not found or password wrong!");
// dn not found or password wrong // dn not found or password wrong
return False; return False;
} }
@ -155,13 +159,13 @@ class auth_ldap implements auth_backend
/** /**
* fetch the last pwd change for the user * fetch the last pwd change for the user
* *
* @param string $username username of account to authenticate * @param string $_username username of account to authenticate
* @return mixed false or shadowlastchange*24*3600 * @return mixed false or shadowlastchange*24*3600
*/ */
function getLastPwdChange($username) function getLastPwdChange($_username)
{ {
// allow non-ascii in username & password // allow non-ascii in username & password
$username = translation::convert($username,translation::charset(),'utf-8'); $username = translation::convert($_username,translation::charset(),'utf-8');
if(!$ldap = common::ldapConnect()) if(!$ldap = common::ldapConnect())
{ {
@ -177,8 +181,8 @@ class auth_ldap implements auth_backend
/* find the dn for this uid, the uid is not always in the dn */ /* find the dn for this uid, the uid is not always in the dn */
$attributes = array('uid','dn','shadowexpire','shadowlastchange'); $attributes = array('uid','dn','shadowexpire','shadowlastchange');
$filter = $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)'; $filter = str_replace(array('%user','%domain'),array(ldap::quote($username),$GLOBALS['egw_info']['user']['domain']),
$filter = str_replace(array('%user','%domain'),array(ldap::quote($username),$GLOBALS['egw_info']['user']['domain']),$filter); $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)');
if ($GLOBALS['egw_info']['server']['account_repository'] == 'ldap') if ($GLOBALS['egw_info']['server']['account_repository'] == 'ldap')
{ {
@ -237,8 +241,8 @@ class auth_ldap implements auth_backend
} }
//echo "<p>auth_ldap::change_password('$old_passwd','$new_passwd',$account_id) username='$username'</p>\n"; //echo "<p>auth_ldap::change_password('$old_passwd','$new_passwd',$account_id) username='$username'</p>\n";
$filter = $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)'; $filter = str_replace(array('%user','%domain'),array($username,$GLOBALS['egw_info']['user']['domain']),
$filter = str_replace(array('%user','%domain'),array($username,$GLOBALS['egw_info']['user']['domain']),$filter); $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)');
$ds = common::ldapConnect(); $ds = common::ldapConnect();
$sri = ldap_search($ds, $GLOBALS['egw_info']['server']['ldap_context'], $filter); $sri = ldap_search($ds, $GLOBALS['egw_info']['server']['ldap_context'], $filter);
@ -286,8 +290,8 @@ class auth_ldap implements auth_backend
} }
if ($this->debug) error_log(__METHOD__."('$old_passwd','$new_passwd',$account_id, $update_lastchange) username='$username'"); if ($this->debug) error_log(__METHOD__."('$old_passwd','$new_passwd',$account_id, $update_lastchange) username='$username'");
$filter = $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)'; $filter = str_replace(array('%user','%domain'),array($username,$GLOBALS['egw_info']['user']['domain']),
$filter = str_replace(array('%user','%domain'),array($username,$GLOBALS['egw_info']['user']['domain']),$filter); $GLOBALS['egw_info']['server']['ldap_search_filter'] ? $GLOBALS['egw_info']['server']['ldap_search_filter'] : '(uid=%user)');
$ds = $ds_admin = common::ldapConnect(); $ds = $ds_admin = common::ldapConnect();
$sri = ldap_search($ds, $GLOBALS['egw_info']['server']['ldap_context'], $filter); $sri = ldap_search($ds, $GLOBALS['egw_info']['server']['ldap_context'], $filter);
@ -308,6 +312,7 @@ class auth_ldap implements auth_backend
$ds = $user_ds->ldapConnect('',$dn,$old_passwd); $ds = $user_ds->ldapConnect('',$dn,$old_passwd);
} }
catch (egw_exception_no_permission $e) { catch (egw_exception_no_permission $e) {
unset($e);
return false; // wrong old user password return false; // wrong old user password
} }
} }