LDAPAccountManager/lam/lib/ldap.inc

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<?php
/*
$Id$
This code is part of LDAP Account Manager (http://www.sourceforge.net/projects/lam)
Copyright (C) 2003 Roland Gruber
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
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/**
* ldap.inc provides basic functions to connect to the OpenLDAP server.
*
* @package LDAP
* @author Roland Gruber
*/
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/** Access to configuration data */
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include_once("config.inc");
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/** Encryption functions */
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include_once("blowfish.inc");
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/**
* Converts a HEX string to a binary value
*
* @param string $value HEX string
* @return binary result binary
*/
function hex2bin($value) {
return pack("H*", $value);
}
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/**
* Returns the hash value of a plain text password
* the hash algorithm depends on the configuration file
*
* @param string $password the password string
* @param boolean $enabled marks the hash as enabled/disabled (e.g. by prefixing "!")
* @return string the password hash
*/
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function pwd_hash($password, $enabled=true) {
// check for empty password
if (! $password || ($password == "")) {
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return "";
}
// calculate new random number
$_SESSION['ldap']->new_rand();
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// hash password with algorithm from config file
$hash = "";
switch ($_SESSION['config']->get_pwdhash()) {
case 'CRYPT':
$hash = "{CRYPT}" . crypt($password);
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break;
case 'MD5':
$hash = "{MD5}" . base64_encode(hex2bin(md5($password)));
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break;
case 'SMD5':
$salt0 = substr(pack("h*", md5($_SESSION['ldap']->rand)), 0, 8);
$salt = substr(pack("H*", md5($salt0 . $password)), 0, 4);
$hash = "{SMD5}" . base64_encode(hex2bin(md5($password . $salt)) . $salt);
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break;
case 'SHA':
// PHP 4.3+ can use sha1() function
if (function_exists(sha1)) {
$hash = "{SHA}" . base64_encode(hex2bin(sha1($password)));
}
// otherwise use MHash
elseif (function_exists(mHash)) {
$hash = "{SHA}" . base64_encode(mHash(MHASH_SHA1, $password));
}
// if SHA1 is not possible use crypt()
else {
$hash = "{CRYPT}" . crypt($password);
}
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break;
case 'SSHA':
// PHP 4.3+ can use sha1() function
if (function_exists(sha1)) {
$salt0 = substr(pack("h*", md5($_SESSION['ldap']->rand)), 0, 8);
$salt = substr(pack("H*", sha1($salt0 . $password)), 0, 4);
$hash = "{SSHA}" . base64_encode(hex2bin(sha1($password . $salt)) . $salt);
}
// otherwise use MHash
elseif (function_exists(mHash)) {
$salt = mhash_keygen_s2k(MHASH_SHA1, $password, substr(pack("h*", md5($_SESSION['ldap']->rand)), 0, 8), 4);
$hash = base64_encode(mHash(MHASH_SHA1, $password . $salt) . $salt);
$hash = "{SSHA}" . $hash;
}
// if SSHA is not possible use crypt()
else {
$hash = "{CRYPT}" . crypt($password);
}
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break;
case 'PLAIN':
$hash = $password;
break;
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// use SSHA if the setting is invalid
default:
// PHP 4.3+ can use sha1() function
if (function_exists(sha1)) {
$salt0 = substr(pack("h*", md5($_SESSION['ldap']->rand)), 0, 8);
$salt = substr(pack("H*", sha1($salt0 . $password)), 0, 4);
$hash = "{SSHA}" . base64_encode(hex2bin(sha1($password . $salt)) . $salt);
}
// otherwise use MHash
elseif (function_exists(mHash)) {
$salt = mhash_keygen_s2k(MHASH_SHA1, $password, substr(pack("h*", md5($_SESSION['ldap']->rand)), 0, 8), 4);
$hash = base64_encode(mHash(MHASH_SHA1, $password . $salt) . $salt);
$hash = "{SSHA}" . $hash;
}
// if SSHA is not possible use crypt()
else {
$hash = "{CRYPT}" . crypt($password);
}
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break;
}
// enable/disable password
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if (! $enabled) return pwd_disable($hash);
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else return $hash;
}
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/**
* Marks an password hash as enabled and returns the new hash string
*
* @param string $hash hash value to enable
* @return string enabled password hash
*/
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function pwd_enable($hash) {
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// check if password is disabled (old wrong LAM method)
if ((substr($hash, 0, 2) == "!{") || ((substr($hash, 0, 2) == "*{"))) {
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return substr($hash, 1, strlen($hash));
}
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// check for "!" or "*" at beginning of password hash
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else {
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if (substr($hash, 0, 1) == "{") {
$pos = strpos($hash, "}");
if ((substr($hash, $pos + 1, 1) == "!") || (substr($hash, $pos + 1, 1) == "*")) {
// enable hash
return substr($hash, 0, $pos + 1) . substr($hash, $pos + 2, strlen($hash));
}
else return $hash; // not disabled
}
else return $hash; // password is plain text
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}
}
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/**
* Marks an password hash as disabled and returns the new hash string
*
* @param string $hash hash value to disable
* @return string disabled hash value
*/
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function pwd_disable($hash) {
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// check if password is disabled (old wrong LAM method)
if ((substr($hash, 0, 2) == "!{") || ((substr($hash, 0, 2) == "*{"))) {
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return $hash;
}
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// check for "!" or "*" at beginning of password hash
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else {
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if (substr($hash, 0, 1) == "{") {
$pos = strpos($hash, "}");
if ((substr($hash, $pos + 1, 1) == "!") || (substr($hash, $pos + 1, 1) == "*")) {
// hash already disabled
return $hash;
}
else return substr($hash, 0, $pos + 1) . "!" . substr($hash, $pos + 1, strlen($hash)); // not disabled
}
else return $hash; // password is plain text
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}
}
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/**
* Checks if a password hash is enabled/disabled
*
* @param string $hash password hash to check
* @return boolean true if the password is marked as enabled
*/
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function pwd_is_enabled($hash) {
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// disabled passwords have a "!" or "*" at the beginning (old wrong LAM method)
if ((substr($hash, 0, 2) == "!{") || ((substr($hash, 0, 2) == "*{"))) return false;
if (substr($hash, 0, 1) == "{") {
$pos = strrpos($hash, "}");
// check if hash starts with "!" or "*"
if ((substr($hash, $pos + 1, 1) == "!") || (substr($hash, $pos + 1, 1) == "*")) return false;
else return true;
}
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else return true;
}
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/**
* Ldap manages connection to LDAP and includes several helper functions.
*
* @package LDAP
*/
class Ldap{
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/** Object of Config to access preferences */
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var $conf;
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/** Server handle */
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var $server;
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/** LDAP username used for bind */
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var $username;
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/** LDAP password used for bind */
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var $password;
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/** Array with all objectClass strings from the LDAP server */
var $objectClasses;
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// Capabilities of the LDAP server
/** Host attribute in inetOrgPerson */
var $supports_unix_hosts = false;
/** ObjectClass sambaAccount */
var $supports_samba2_schema = false;
/** ObjectClass sambaSamAccount */
var $supports_samba3_schema = false;
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/** Random number (changes on every page request) */
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var $rand;
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/**
* @param object $config an object of class Config
*/
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function Ldap($config) {
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setlanguage();
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if (is_object($config)) $this->conf = $config;
else return false;
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mt_srand((double)microtime()*1000000);
$this->rand = mt_rand();
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return true;
}
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/**
* Connects to the server using the given username and password
*
* @param string $user user name
* @param string $passwd password
* @return mixed if connect succeeds the server handle is returned, else false
*/
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function connect($user, $passwd) {
// close any prior connection
@$this->close();
// do not allow anonymous bind
if ((!$user)||($user == "")||(!$passwd)) {
return false;
}
// save password und username encrypted
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$this->encrypt_login($user, $passwd);
$this->server = @ldap_connect($this->conf->get_ServerURL());
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if ($this->server) {
// use LDAPv3
ldap_set_option($this->server, LDAP_OPT_PROTOCOL_VERSION, 3);
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// start TLS if possible
if (function_exists('ldap_start_tls')) {
@ldap_start_tls($this->server);
// connect without TLS if it failed
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if (ldap_errno($this->server) != 0) {
@ldap_close($this->server);
$this->server = @ldap_connect($this->conf->get_ServerURL());
ldap_set_option($this->server, LDAP_OPT_PROTOCOL_VERSION, 3);
}
}
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$bind = @ldap_bind($this->server, $user, $passwd);
if ($bind) {
// read objectClasses from server and update capabilities if needed
if (! $this->objectClasses) {
$this->updateClasses();
$this->updateCapabilities();
}
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// return success number
return ldap_errno($this->server);
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}
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// return error number
else return ldap_errno($this->server);
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}
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else return false;
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}
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/** Closes connection to server */
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function close() {
@ldap_close($this->server);
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}
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/**
* Searches LDAP for a specific user name and returns its DN entry
*
* @param string $name user name
* @return string DN
*/
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function search_username($name) {
$filter = "(uid=$name)";
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$attrs = array();
$sr = @ldap_search($this->server, $this->conf->get_UserSuffix(), $filter, $attrs);
if ($sr) {
$info = ldap_get_entries($this->server, $sr);
// return only first DN entry
$ret = $info[0]["dn"];
ldap_free_result($sr);
return $ret;
}
}
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/**
* Returns an array with all organizational units under the given suffix
*
* @param string $suffix search suffix
* @return array DNs of organizational units
*/
function search_units($suffix) {
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$ret = array();
$sr = @ldap_search($this->server(), $suffix, "objectClass=organizationalunit", array("DN"));
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if ($sr) {
$units = ldap_get_entries($this->server, $sr);
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// extract Dns
for ($i = 0; $i < sizeof($units); $i++) {
if ($units[$i]['dn']) $ret[] = $units[$i]['dn'];
}
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}
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// add root suffix if needed
$found = false;
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for ($i = 0; $i < sizeof($ret); $i++) { // search suffix case-intensitive
if (strtolower($suffix) == strtolower($ret[$i])) {
$found = true;
break;
}
}
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if (!$found) {
$ret[] = $suffix;
}
usort($ret, array($this,"cmp_array"));
return $ret;
}
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/**
* Returns an array with all Samba 3 domain entries under the given suffix
*
* @param string $suffix search suffix
* @return array list of samba3domain objects
*/
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function search_domains($suffix) {
$ret = array();
$attr = array("DN", "sambaDomainName", "sambaSID", "sambaNextRid", "sambaNextGroupRid",
"sambaNextUserRid", "sambaAlgorithmicRidBase");
$sr = @ldap_search($this->server(), $suffix, "objectClass=sambaDomain", $attr);
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if ($sr) {
$units = ldap_get_entries($this->server, $sr);
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// delete count entry
array_shift($units);
// extract attributes
for ($i = 0; $i < sizeof($units); $i++) {
$ret[$i] = new samba3domain();
$ret[$i]->dn = $units[$i]['dn'];
$ret[$i]->name = $units[$i]['sambadomainname'][0];
$ret[$i]->SID = $units[$i]['sambasid'][0];
$ret[$i]->nextRID = $units[$i]['sambanextrid'][0];
$ret[$i]->nextGroupRID = $units[$i]['sambanextgrouprid'][0];
$ret[$i]->nextUserRID = $units[$i]['sambanextuserrid'][0];
if (isset($units[$i]['sambaalgorithmicridbase'][0])) $ret[$i]->RIDbase = $units[$i]['sambaalgorithmicridbase'][0];
}
// sort array by domain name
usort($ret, array($this,"cmp_domain"));
}
return $ret;
}
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/** Reads the array of objectClasses from the LDAP server */
function updateClasses() {
// read from default cn
$sr = @ldap_read($this->server, 'cn=subschema', '(objectClass=*)', array('objectclasses'));
// if default was not correct check different cn
if (!$sr) $sr = @ldap_read($this->server, 'cn=schema', '(objectClass=*)', array('objectclasses'));
if ($sr) {
// get search result and save it
$info = @ldap_get_entries($this->server,$sr);
if ($info) {
$this->objectClasses = $info[0]['objectclasses'];
array_shift($this->objectClasses);
return true;
}
}
// if search failed save empty result
$this->objectClasses = array();
}
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/** Updates the capabilities values (var $supports_*) */
function updateCapabilities() {
for ($i = 0; $i < sizeof($this->objectClasses); $i++) {
$line = $this->objectClasses[$i];
// search keywords
if (strpos($line, "NAME 'inetOrgPerson'") && strpos($line, " host ")) $this->supports_unix_hosts = true;
if (strpos($line, "NAME 'sambaAccount'")) $this->supports_samba2_schema = true;
if (strpos($line, "NAME 'sambaSamAccount'")) $this->supports_samba3_schema = true;
}
}
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/**
* Returns the LDAP connection handle
*
* @return object connection handle
*/
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function server() {
return $this->server;
}
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/** Closes connection to LDAP server before serialization */
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function __sleep() {
$this->close();
// define which attributes to save
return array("conf", "username", "password", "ldapUserAttributes", "ldapGroupAttributes",
"ldapHostAttributes", "objectClasses", "supports_unix_hosts", "supports_samba2_schema",
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"supports_samba3_schema", "rand");
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}
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/** Reconnects to LDAP server when deserialized */
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function __wakeup() {
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$data = $this->decrypt_login();
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$this->connect($data[0], $data[1]);
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// change random number
mt_srand($this->rand + (microtime() * 1000000));
$this->rand = mt_rand();
// delete PDF files which are older than 10 min
if (isset($_SESSION['lampath'])) {
$relpath = $_SESSION['lampath'] . 'tmp/';
$time = time();
$dir = @opendir($relpath);
while ($file = @readdir($dir)) {
if (substr($file, -4) == '.pdf') {
$path = $relpath . $file;
if ($time - filemtime($path) > 600) {
@unlink($path);
}
}
}
@closedir($h);
}
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}
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/** Calculates a new value for rand */
function new_rand() {
// change random number
mt_srand($this->rand + (microtime() * 1000000));
$this->rand = mt_rand();
}
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/**
* Encrypts a string
*
* @param string $data string to encrypt
* @return object encrypted string
*/
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function encrypt($data) {
// use MCrypt if available
if (function_exists(mcrypt_create_iv)) {
// read key and iv from cookie
$iv = base64_decode($_COOKIE["IV"]);
$key = base64_decode($_COOKIE["Key"]);
// encrypt string
return mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_ECB, $iv);
}
// use Blowfish if MCrypt is not available
else {
// read key and iv from cookie
$iv = base64_decode($_COOKIE["IV"]);
$key = base64_decode($_COOKIE["Key"]);
$b_key = $iv . $key;
// encrypt string
$b_fish = new Cipher_blowfish();
return $b_fish->encrypt($data, $b_key);
}
}
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/**
* Decrypts a string
*
* @param object $data string to decrypt
* @return string decrypted string
*/
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function decrypt($data) {
// use MCrypt if available
if (function_exists(mcrypt_create_iv)) {
// read key and iv from cookie
$iv = base64_decode($_COOKIE["IV"]);
$key = base64_decode($_COOKIE["Key"]);
// decrypt string
$ret = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_ECB, $iv);
$ret = str_replace(chr(00), "", $ret);
return $ret;
}
// use Blowfish if MCrypt is not available
else {
// read key and iv from cookie
$iv = base64_decode($_COOKIE["IV"]);
$key = base64_decode($_COOKIE["Key"]);
$b_key = $iv . $key;
// decrypt string
$b_fish = new Cipher_blowfish();
return $b_fish->decrypt($data, $b_key);
}
}
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/**
* Encrypts username and password
*
* @param string $username LDAP user name
* @param string $password LDAP password
*/
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function encrypt_login($username, $password) {
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// encrypt username and password
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$this->username = base64_encode($this->encrypt($username));
$this->password = base64_encode($this->encrypt($password));
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}
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/**
* Decrypts username and password
*
* @return array array(user name, password)
*/
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function decrypt_login() {
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// decrypt username and password
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$username = $this->decrypt(base64_decode($this->username));
$password = $this->decrypt(base64_decode($this->password));
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$ret = array($username, $password);
return $ret;
}
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/** Closes connection to LDAP server and deletes encrypted username/password */
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function destroy() {
$this->close();
$this->username="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
$this->password="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
}
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/**
* Helper function to sort the unit DNs
*
* @param string $a first argument to compare
* @param string $b second argument to compare
* @return integer 0 if equal, 1 if $a is greater, -1 if $b is greater
*/
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function cmp_array($a, $b) {
// split DNs
$array_a = explode(",", $a);
$array_b = explode(",", $b);
$len_a = sizeof($array_a);
$len_b = sizeof($array_b);
// check how many parts to compare
$len = min($len_a, $len_b);
// compare from last part on
for ($i = 0; $i < $len; $i++) {
// get parts to compare
$part_a = strtolower($array_a[$len_a - $i - 1]);
$part_b = strtolower($array_b[$len_b - $i - 1]);
// compare parts
if ($part_a == $part_b) { // part is identical
if ($i == ($len - 1)) {
if ($len_a > $len_b) return 1;
elseif ($len_a < $len_b) return -1;
else return 0; // DNs are identical
}
}
elseif ($part_a == max($part_a, $part_b)) return 1;
else return -1;
}
}
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/**
* Helper function to sort the domains
*
* @param string $a first argument to compare
* @param string $b second argument to compare
* @return integer 0 if equal, 1 if $a is greater, -1 if $b is greater
*/
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function cmp_domain($a, $b) {
if ($a->name == $b->name) return 0;
elseif ($a->name == max($a->name, $b->name)) return 1;
else return -1;
}
}
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/**
* Represents a Samba 3 domain entry
*
* @package LDAP
*/
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class samba3domain {
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/** DN */
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var $dn;
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/** Domain name */
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var $name;
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/** Domain SID */
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var $SID;
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/** Next RID */
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var $nextRID;
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/** Next user RID */
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var $nextUserRID;
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/** Next group RID */
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var $nextGroupRID;
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/** RID base to calculate RIDs, default 1000 */
var $RIDbase = 1000;
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}
?>