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<?php
/**
* LDAP authentication backend
*
* tested with openldap 2.x on Debian only
*
* PHPs LDAP extension is needed
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
*/
//check for LDAP extension on load
if(!function_exists('ldap_connect'))
msg("LDAP extension not found",-1);
/**
* Connect to the LDAP server
*
* Holds the connection in global scope for multiple use
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function auth_ldap_connect(){
global $LDAP_CONNECTION;
global $conf;
$cnf = $conf['auth']['ldap'];
if(!$LDAP_CONNECTION){
$LDAP_CONNECTION = @ldap_connect($cnf['server']);
if(!$LDAP_CONNECTION){
msg("LDAP: couldn't connect to LDAP server",-1);
return false;
}
if($cnf['version']){
if(!@ldap_set_option($LDAP_CONNECTION,
LDAP_OPT_PROTOCOL_VERSION,
$cnf['version'])){
msg('Setting LDAP Protocol version '.$cnf['version'].' failed',-1);
if($cnf['debug'])
msg('LDAP errstr: '.htmlspecialchars(ldap_error($LDAP_CONNECTION)),0);
}
}
}
return $LDAP_CONNECTION;
}
/**
* Check user+password [required auth function]
*
* Checks if the given user exists and the given
* plaintext password is correct by trying to bind
* to the LDAP server
*
* @author Andreas Gohr <andi@splitbrain.org>
* @return bool
*/
function auth_checkPass($user,$pass){
global $conf;
$cnf = $conf['auth']['ldap'];
//connect to LDAP Server
$conn = auth_ldap_connect();
if(!$conn) return false;
//get dn for given user
$info = auth_getUserData($user);
$dn = $info['dn'];
if(!$dn) return false;
//try to bind with dn
if(@ldap_bind($conn,$dn,$pass)){
if($cnf['debug']) msg('LDAP errstr: '.htmlspecialchars(ldap_error($conn)),0);
return true;
}
return false;
}
/**
* Return user info [required auth function]
*
* Returns info about the given user needs to contain
* at least these fields:
*
* name string full name of the user
* mail string email addres of the user
* grps array list of groups the user is in
*
* This LDAP specific function returns the following
* addional fields:
*
* dn string distinguished name (DN)
* uid string Posix User ID
*
* @author Andreas Gohr <andi@splitbrain.org>
* @author Trouble
* @author Dan Allen <dan.j.allen@gmail.com>
*/
function auth_getUserData($user){
global $conf;
$cnf = $conf['auth']['ldap'];
//connect to LDAP Server
$conn = auth_ldap_connect();
if(!$conn) return false;
//anonymous bind to lookup userdata
if(!@ldap_bind($conn)){
msg("LDAP: can not bind anonymously",-1);
if($cnf['debug']) msg('LDAP errstr: '.htmlspecialchars(ldap_error($conn)),0);
return false;
}
//get info for given user
$filter = str_replace('%u',$user,$cnf['userfilter']);
$base = str_replace('%u',$user,$cnf['usertree']);
$sr = ldap_search($conn, $base, $filter);;
$result = ldap_get_entries($conn, $sr);
if($result['count'] != 1){
return false; //user not found
}
//general user info
$info['dn'] = $result[0]['dn'];
$info['mail']= $result[0]['mail'][0];
$info['name']= $result[0]['cn'][0];
$info['uid'] = $result[0]['uid'][0];
//primary group id
$gid = $result[0]['gidnumber'][0];
//get groups for given user if grouptree is given
if ($cnf['grouptree'] != '') {
$filter = str_replace('%i', $info['uid'], $cnf['groupfilter']);
$filter = str_replace('%u', $info['name'], $filter);
$filter = str_replace('%g', $gid, $filter);
$sr = @ldap_search($conn, $cnf['grouptree'], $filter);
if(!$sr){
msg("LDAP: Reading group memberships failed",-1);
if($cnf['debug']) msg('LDAP errstr: '.htmlspecialchars(ldap_error($conn)),0);
return false;
}
$result = ldap_get_entries($conn, $sr);
foreach($result as $grp){
if(!empty($grp['cn'][0]))
$info['grps'][] = $grp['cn'][0];
}
}else{
//if no groups are available in LDAP always return the default group
$info['grps'][] = $conf['defaultgroup'];
}
return $info;
}
/**
* Create a new User [required auth function]
*
* Not implemented
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function auth_createUser($user,$name,$mail){
msg("Sorry. Creating users is not supported by the LDAP backend",-1);
return null;
}
?>
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