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<?php
/**
* abook_ldap_server.php
*
* Address book backend for LDAP server
*
* LDAP filtering code by Tim Bell
* <bhat at users.sourceforge.net> (#539534)
* ADS limit_scope code by Michael Brown
* <mcb30 at users.sourceforge.net> (#1035454)
* StartTLS code by John Lane
* <starfry at users.sourceforge.net> (#1197703)
*
* @copyright © 1999-2006 The SquirrelMail Project Team
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
* @version $Id: abook_ldap_server.php,v 1.39 2006/01/23 18:39:32 tokul Exp $
* @package squirrelmail
* @subpackage addressbook
*/
/**
* Address book backend for LDAP server
*
* An array with the following elements must be passed to
* the class constructor (elements marked ? are optional)
*
* Main settings:
* <pre>
* host => LDAP server hostname/IP-address
* base => LDAP server root (base dn). Empty string allowed.
* ? port => LDAP server TCP port number (default: 389)
* ? charset => LDAP server charset (default: utf-8)
* ? name => Name for LDAP server (default "LDAP: hostname")
* Used to tag the result data
* ? maxrows => Maximum # of rows in search result
* ? timeout => Timeout for LDAP operations (in seconds, default: 30)
* Might not work for all LDAP libraries or servers.
* ? binddn => LDAP Bind DN.
* ? bindpw => LDAP Bind Password.
* ? protocol => LDAP Bind protocol.
* </pre>
* Advanced settings:
* <pre>
* ? filter => Filter expression to limit ldap searches
* ? limit_scope => Limits scope to base DN (Specific to Win2k3 ADS).
* ? listing => Controls listing of LDAP directory.
* ? search_tree => Controls subtree or one level search.
* ? starttls => Controls use of StartTLS on LDAP connections
* </pre>
* NOTE. This class should not be used directly. Use the
* "AddressBook" class instead.
* @package squirrelmail
* @subpackage addressbook
*/
class abook_ldap_server extends addressbook_backend {
/**
* @var string backend type
*/
var $btype = 'remote';
/**
* @var string backend name
*/
var $bname = 'ldap_server';
/* Parameters changed by class */
/**
* @var string displayed name
*/
var $sname = 'LDAP'; /* Service name */
/**
* @var string LDAP server name or address or url
*/
var $server = '';
/**
* @var integer LDAP server port
*/
var $port = 389;
/**
* @var string LDAP base DN
*/
var $basedn = '';
/**
* @var string charset used for entries in LDAP server
*/
var $charset = 'utf-8';
/**
* @var object PHP LDAP link ID
*/
var $linkid = false;
/**
* @var bool True if LDAP server is bound
*/
var $bound = false;
/**
* @var integer max rows in result
*/
var $maxrows = 250;
/**
* @var string ldap filter
* @since 1.5.1
*/
var $filter = '';
/**
* @var integer timeout of LDAP operations (in seconds)
*/
var $timeout = 30;
/**
* @var string DN to bind to (non-anonymous bind)
* @since 1.5.0 and 1.4.3
*/
var $binddn = '';
/**
* @var string password to bind with (non-anonymous bind)
* @since 1.5.0 and 1.4.3
*/
var $bindpw = '';
/**
* @var integer protocol used to connect to ldap server
* @since 1.5.0 and 1.4.3
*/
var $protocol = '';
/**
* @var boolean limits scope to base dn
* @since 1.5.1
*/
var $limit_scope = false;
/**
* @var boolean controls listing of directory
* @since 1.5.1
*/
var $listing = false;
/**
* @var boolean controls ldap search type.
* only first level entries are displayed if set to false
* @since 1.5.1
*/
var $search_tree = true;
/**
* @var boolean controls use of StartTLS on ldap
* connections. Requires php 4.2+ and protocol >= 3
* @since 1.5.1
*/
var $starttls = false;
/**
* Constructor. Connects to database
* @param array connection options
*/
function abook_ldap_server($param) {
if(!function_exists('ldap_connect')) {
$this->set_error(_("PHP install does not have LDAP support."));
return;
}
if(is_array($param)) {
$this->server = $param['host'];
$this->basedn = $param['base'];
if(!empty($param['port']))
$this->port = $param['port'];
if(!empty($param['charset']))
$this->charset = strtolower($param['charset']);
if(isset($param['maxrows']))
$this->maxrows = $param['maxrows'];
if(isset($param['timeout']))
$this->timeout = $param['timeout'];
if(isset($param['binddn']))
$this->binddn = $param['binddn'];
if(isset($param['bindpw']))
$this->bindpw = $param['bindpw'];
if(isset($param['protocol']))
$this->protocol = (int) $param['protocol'];
if(isset($param['filter']))
$this->filter = trim($param['filter']);
if(isset($param['limit_scope']))
$this->limit_scope = (bool) $param['limit_scope'];
if(isset($param['listing']))
$this->listing = (bool) $param['listing'];
if(isset($param['search_tree']))
$this->search_tree = (bool) $param['search_tree'];
if(isset($param['starttls']))
$this->starttls = (bool) $param['starttls'];
if(empty($param['name'])) {
$this->sname = 'LDAP: ' . $param['host'];
} else {
$this->sname = $param['name'];
}
/*
* don't open LDAP server on addressbook_init(),
* open ldap connection only on search. Speeds up
* addressbook_init() call.
*/
// $this->open(true);
} else {
$this->set_error('Invalid argument to constructor');
}
}
/**
* Open the LDAP server.
* @param bool $new is it a new connection
* @return bool
*/
function open($new = false) {
$this->error = '';
/* Connection is already open */
if($this->linkid != false && !$new) {
return true;
}
$this->linkid = @ldap_connect($this->server, $this->port);
/**
* check if connection was successful
* It does not work with OpenLDAP 2.x libraries. Connect error will be
* displayed only on ldap command that tries to make connection
* (ldap_start_tls or ldap_bind).
*/
if(!$this->linkid) {
return $this->set_error($this->ldap_error('ldap_connect failed'));
}
if(!empty($this->protocol)) {
// make sure that ldap_set_option() is available before using it
if(! function_exists('ldap_set_option') ||
!@ldap_set_option($this->linkid, LDAP_OPT_PROTOCOL_VERSION, $this->protocol)) {
return $this->set_error('unable to set ldap protocol number');
}
}
/**
* http://www.php.net/ldap-start-tls
* Check if v3 or newer protocol is used,
* check if ldap_start_tls function is available.
* Silently ignore setting, if these requirements are not satisfied.
* Break with error message if somebody tries to start TLS on
* ldaps or socket connection.
*/
if($this->starttls &&
!empty($this->protocol) && $this->protocol >= 3 &&
function_exists('ldap_start_tls') ) {
// make sure that $this->server is not ldaps:// or ldapi:// URL.
if (preg_match("/^ldap[si]:\/\/.+/i",$this->server)) {
return $this->set_error("you can't enable starttls on ldaps and ldapi connections.");
}
// try starting tls
if (! @ldap_start_tls($this->linkid)) {
// set error if call fails
return $this->set_error($this->ldap_error('ldap_start_tls failed'));
}
}
if(!empty($this->limit_scope) && $this->limit_scope) {
if(empty($this->protocol) || intval($this->protocol) < 3) {
return $this->set_error('limit_scope requires protocol >= 3');
}
// See http://msdn.microsoft.com/library/en-us/ldap/ldap/ldap_server_domain_scope_oid.asp
$ctrl = array ( "oid" => "1.2.840.113556.1.4.1339", "iscritical" => TRUE );
/*
* Option is set only during connection.
* It does not cause immediate errors with OpenLDAP 2.x libraries.
*/
if(! function_exists('ldap_set_option') ||
!@ldap_set_option($this->linkid, LDAP_OPT_SERVER_CONTROLS, array($ctrl))) {
return $this->set_error($this->ldap_error('limit domain scope failed'));
}
}
// authenticated bind
if(!empty($this->binddn)) {
if(!@ldap_bind($this->linkid, $this->binddn, $this->bindpw)) {
return $this->set_error($this->ldap_error('authenticated ldap_bind failed'));
}
} else {
// anonymous bind
if(!@ldap_bind($this->linkid)) {
return $this->set_error($this->ldap_error('anonymous ldap_bind failed'));
}
}
$this->bound = true;
return true;
}
/**
* Encode string to the charset used by this LDAP server
* @param string string that has to be encoded
* @return string encoded string
*/
function charset_encode($str) {
global $default_charset;
if($this->charset != $default_charset) {
return charset_convert($default_charset,$str,$this->charset,false);
} else {
return $str;
}
}
/**
* Decode from charset used by this LDAP server to charset used by translation
*
* Uses SquirrelMail charset_decode functions
* @param string string that has to be decoded
* @return string decoded string
*/
function charset_decode($str) {
global $default_charset;
if ($this->charset != $default_charset) {
return charset_convert($this->charset,$str,$default_charset,false);
} else {
return $str;
}
}
/**
* Sanitizes ldap search strings.
* See rfc2254
* @link http://www.faqs.org/rfcs/rfc2254.html
* @since 1.5.1 and 1.4.5
* @param string $string
* @return string sanitized string
*/
function ldapspecialchars($string) {
$sanitized=array('\\' => '\5c',
'*' => '\2a',
'(' => '\28',
')' => '\29',
"\x00" => '\00');
return str_replace(array_keys($sanitized),array_values($sanitized),$string);
}
/**
* Search LDAP server.
*
* Warning: You must make sure that ldap query is correctly formated and
* sanitize use of special ldap keywords.
* @param string $expression ldap query
* @return array search results (false on error)
* @since 1.5.1
*/
function ldap_search($expression) {
/* Make sure connection is there */
if(!$this->open()) {
return false;
}
if ($this->search_tree) {
// ldap_search - search subtree
$sret = @ldap_search($this->linkid, $this->basedn, $expression,
array('dn', 'o', 'ou', 'sn', 'givenname', 'cn', 'mail'),
0, $this->maxrows, $this->timeout);
} else {
// ldap_list - search one level
$sret = @ldap_list($this->linkid, $this->basedn, $expression,
array('dn', 'o', 'ou', 'sn', 'givenname', 'cn', 'mail'),
0, $this->maxrows, $this->timeout);
}
/* Return error if search failed */
if(!$sret) {
return $this->set_error($this->ldap_error('ldap_search failed'));
}
if(@ldap_count_entries($this->linkid, $sret) <= 0) {
return array();
}
/* Get results */
$ret = array();
$returned_rows = 0;
$res = @ldap_get_entries($this->linkid, $sret);
for($i = 0 ; $i < $res['count'] ; $i++) {
$row = $res[$i];
/* Extract data common for all e-mail addresses
* of an object. Use only the first name */
$nickname = $this->charset_decode($row['dn']);
/**
* calculate length of basedn and remove it from nickname
* ignore whitespaces between RDNs
* Nicknames are shorter and still unique
*/
$basedn_len=strlen(preg_replace('/,\s*/',',',trim($this->basedn)));
$nickname=substr(preg_replace('/,\s*/',',',$nickname),0,(-1 - $basedn_len));
$fullname = $this->charset_decode($row['cn'][0]);
if(!empty($row['ou'][0])) {
$label = $this->charset_decode($row['ou'][0]);
}
else if(!empty($row['o'][0])) {
$label = $this->charset_decode($row['o'][0]);
} else {
$label = '';
}
if(empty($row['givenname'][0])) {
$firstname = '';
} else {
$firstname = $this->charset_decode($row['givenname'][0]);
}
if(empty($row['sn'][0])) {
$surname = '';
} else {
$surname = $this->charset_decode($row['sn'][0]);
}
/* Add one row to result for each e-mail address */
if(isset($row['mail']['count'])) {
for($j = 0 ; $j < $row['mail']['count'] ; $j++) {
array_push($ret, array('nickname' => $nickname,
'name' => $fullname,
'firstname' => $firstname,
'lastname' => $surname,
'email' => $row['mail'][$j],
'label' => $label,
'backend' => $this->bnum,
'source' => &$this->sname));
// Limit number of hits
$returned_rows++;
if(($returned_rows >= $this->maxrows) &&
($this->maxrows > 0) ) {
ldap_free_result($sret);
return $ret;
}
} // for($j ...)
} // isset($row['mail']['count'])
}
ldap_free_result($sret);
return $ret;
}
/**
* Get error from LDAP resource if possible
*
* Should get error from server using the ldap_errno() and ldap_err2str() functions
* @param string $sError error message used when ldap error functions
* and connection resource are unavailable
* @return string error message
* @since 1.5.1
*/
function ldap_error($sError) {
// it is possible that function_exists() tests are not needed
if(function_exists('ldap_err2str') &&
function_exists('ldap_errno') &&
is_resource($this->linkid)) {
return ldap_err2str(ldap_errno($this->linkid));
// return ldap_error($this->linkid);
} else {
return $sError;
}
}
/* ========================== Public ======================== */
/**
* Search the LDAP server
* @param string $expr search expression
* @return array search results
*/
function search($expr) {
/* To be replaced by advanded search expression parsing */
if(is_array($expr)) return false;
// don't allow wide search when listing is disabled.
if ($expr=='*' && ! $this->listing) {
return array();
} elseif ($expr=='*') {
// allow use of wildcard when listing is enabled.
$expression = '(cn=*)';
} else {
/* Convert search from user's charset to the one used in ldap */
$expr = $this->charset_encode($expr);
/* sanitize search string */
$expr = $this->ldapspecialchars($expr);
/* Search for same string in cn, main and sn */
$expression = '(|(cn=*'.$expr.'*)(mail=*'.$expr.'*)(sn=*'.$expr.'*))';
/* Undo sanitizing of * symbol */
$expression = str_replace('\2a','*',$expression);
}
/* Add search filtering */
if ($this->filter!='')
$expression = '(&' . $this->filter . $expression . ')';
/* Use internal search function and return search results */
return $this->ldap_search($expression);
}
/**
* List all entries present in LDAP server
*
* maxrows setting might limit list of returned entries.
* Careful with this -- it could get quite large for big sites.
* @return array all entries in ldap server
*/
function list_addr() {
if (! $this->listing)
return array();
/* set wide search expression */
$expression = '(cn=*)';
/* add filtering */
if ($this->filter!='')
$expression = '(&' . $this->filter . $expression .')';
/* use internal search function and return search results */
return $this->ldap_search($expression);
}
}
?>
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