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<?php
/**
* The Auth_passwd:: class provides a passwd-file implementation of
* the Horde authentication system.
*
* Optional parameters:<pre>
* 'filename' The passwd file to use.
* DEFAULT: /etc/passwd
* 'lock' Should we lock the passwd file? (boolean)
* DEFAULT: false</pre>
*
*
* $Horde: framework/Auth/Auth/passwd.php,v 1.16.10.11 2006/08/14 02:48:48 chuck Exp $
*
* Copyright 1997-2006 Rasmus Lerdorf <rasmus@php.net>
* Copyright 2002-2006 Chuck Hagenbuch <chuck@horde.org>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Rasmus Lerdorf <rasmus@php.net>
* @author Chuck Hagenbuch <chuck@horde.org>
* @since Horde 1.3
* @package Horde_Auth
*/
class Auth_passwd extends Auth {
/**
* An array of capabilities, so that the driver can report which
* operations it supports and which it doesn't.
*
* @var array
*/
var $capabilities = array('add' => false,
'update' => false,
'resetpassword' => false,
'remove' => false,
'list' => true,
'transparent' => false);
/**
* Passwd file.
*
* @var string
*/
var $_filename = '/etc/passwd';
/**
* Hash list of users.
*
* @var array
*/
var $_users;
/**
* Filehandle for lockfile.
*
* @var integer
*/
var $_fplock;
/**
* Locking state.
*
* @var boolean
*/
var $_locked;
/**
* List of users that should be excluded from being listed/handled
* in any way by this driver.
*
* @var array
*/
var $_exclude = array('root', 'daemon', 'bin', 'sys', 'sync', 'games',
'man', 'lp', 'mail', 'news', 'uucp', 'proxy',
'postgres', 'www-data', 'backup', 'operator',
'list', 'irc', 'gnats', 'nobody', 'identd',
'sshd', 'gdm', 'postfix', 'mysql', 'cyrus', 'ftp');
/**
* Constructs a new Passwd authentication object.
*
* @param array $params A hash containing connection parameters.
*/
function Auth_passwd($params = array())
{
$this->_params = $params;
if (!empty($params['filename'])) {
$this->_filename = $params['filename'];
}
$this->_fplock = fopen(Horde::getTempDir() . '/passwd.lock', 'w');
if (!empty($params['lock'])) {
flock($this->_fplock, LOCK_EX);
$this->_locked = true;
}
$fp = fopen($this->_filename, 'r');
if (!$fp) {
return PEAR::raiseError("Couldn't open '" . $this->_filename . "'.");
}
while (!feof($fp)) {
$line = fgets($fp, 128);
if (!empty($line)) {
list($user, $pass, $uid, $gid, $info, $home, $shell) = explode(':', $line);
if (strlen($user) &&
!in_array($user, $this->_exclude)) {
$this->_users[$user]['password'] = $pass;
$this->_users[$user]['uid'] = $uid;
$this->_users[$user]['gid'] = $gid;
$this->_users[$user]['info'] = $info;
$this->_users[$user]['home'] = $home;
$this->_users[$user]['shell'] = $shell;
}
}
}
fclose($fp);
}
/**
* Find out if a set of login credentials are valid.
*
* @access private
*
* @param string $userId The userId to check.
* @param array $credentials An array of login credentials. For MCAL,
* this must contain a password entry.
*
* @return boolean Whether or not the credentials are valid.
*/
function _authenticate($userId, $credentials)
{
if (empty($credentials['password'])) {
Horde::fatal(_("No password provided for PASSWD authentication."), __FILE__, __LINE__);
}
if (isset($this->_users[$userId])) {
if ($this->_users[$userId]['password'] == crypt($credentials['password'], substr($this->_users[$userId]['password'], 0, 2))) return true;
}
return false;
}
/**
* List all users in the system.
*
* @return mixed The array of userIds, or a PEAR_Error object on failure.
*/
function listUsers()
{
return array_keys($this->_users);
}
/**
* Adds a user.
*
* @param string $user New user ID.
* @param string $pass Password for new user.
* @param string $cvsuser CVS user id (needed for pserver passwd files).
*
* @return boolean Returns true or PEAR_Error if the user already
* exists.
*/
function addUser($user, $pass, $cvsuser = '')
{
if (!isset($this->_users[$user]) && $this->_locked) {
$this->_users[$user] = crypt($pass);
$this->_cvs[$user] = $cvsuser;
return true;
} else {
return PEAR::raiseError("Couldn't add user '$user', because the user already exists.");
}
}
/**
* Modifies a user.
*
* @param string $user User ID.
* @param string $pass Password for new user.
* @param string $cvsuser CVS user id (needed for pserver passwd files).
*
* @return boolean Returns true or PEAR_Error if the user doesn't
* exists.
*/
function modUser($user, $pass, $cvsuser = '')
{
if (isset($this->_users[$user]) && $this->_locked) {
$this->_users[$user] = crypt($pass);
$this->_cvs[$user] = $cvsuser;
return true;
} else {
return PEAR::raiseError("Couldn't modify user '$user', because the user doesn't exist.");
}
}
/**
* Deletes a user.
*
* @param string $user User ID.
*
* @return boolean Returns true or PEAR_Error if the user doesn't exist.
*/
function delUser($user)
{
if (isset($this->_users[$user]) && $this->_locked) {
unset($this->_users[$user]);
unset($this->_cvs[$user]);
} else {
return PEAR::raiseError("Couldn't delete user '$user', because the user doesn't exist.");
}
}
/**
* Writes changes to passwd file and unlocks it. Takes no arguments and
* has no defined return value.
*/
function close()
{
if ($this->_locked) {
foreach ($this->_users as $user => $pass) {
if ($this->_users[$user]) {
fputs($this->_fplock, "$user:$pass:" . $this->_users[$user] . "\n");
} else {
fputs($this->_fplock, "$user:$pass\n");
}
}
rename($this->_lockfile, $this->_filename);
flock($this->_fplock, LOCK_UN);
$this->_locked = false;
fclose($this->_fplock);
}
}
}
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