unix.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * File::Passwd::Unix
 * 
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to [e-mail] so we can mail you a copy immediately.
 *
 * @category   FileFormats
 * @package    File_Passwd
 * @author     Michael Wallner <[e-mail]>
 * @copyright  2003-2005 Michael Wallner
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    CVS: $Id: Unix.php,v 1.17 2005/03/30 18:33:33 mike Exp $
 * @link       http://pear.php.net/package/File_Passwd
 */

/**
* Requires File::Passwd::Common
*/
require_once 'File/Passwd/Common.php';

/**
* Manipulate standard Unix passwd files.
* 
* <kbd><u>Usage Example:</u></kbd>
* <code>
*   $passwd = &File_Passwd::factory('Unix');
*   $passwd->setFile('/my/passwd/file');
*   $passwd->load();
*   $passwd->addUser('mike', 'secret');
*   $passwd->save();
* </code>
* 
* 
* <kbd><u>Output of listUser()</u></kbd>
* # using the 'name map':
* <pre>
*      array
*       + user  => array
*                   + pass  => crypted_passwd or 'x' if shadowed
*                   + uid   => user id
*                   + gid   => group id
*                   + gecos => comments
*                   + home  => home directory
*                   + shell => standard shell
* </pre>
* # without 'name map':
* <pre>
*      array
*       + user  => array
*                   + 0  => crypted_passwd
*                   + 1  => ...
*                   + 2  => ...
* </pre>
* 
* @author   Michael Wallner <[e-mail]>
* @package  File_Passwd
* @version  $Revision: 1.17 $
* @access   public
*/
class File_Passwd_Unix extends File_Passwd_Common
{
    /**
    * A 'name map' wich refer to the extra properties
    *
    * @var array
    * @access private
    */
    var $_map = array('uid', 'gid', 'gecos', 'home', 'shell');
    
    /**
    * Whether to use the 'name map' or not
    *
    * @var boolean
    * @access private
    */
    var $_usemap = true;
    
    /**
    * Whether the passwords of this passwd file are shadowed in another file
    *
    * @var boolean
    * @access private
    */
    var $_shadowed = false;
    
    /**
    * Encryption mode, either md5 or des
    *
    * @var string
    * @access private
    */
    var $_mode = 'des';
    
    /**
    * Supported encryption modes
    * 
    * @var array
    * @access private
    */
    var $_modes = array('md5' => 'md5', 'des' => 'des');
    
    /**
    * Constructor
    *
    * @access public
    * @param  string    $file   path to passwd file
    */
    function File_Passwd_Unix($file = 'passwd')
    {
        parent::__construct($file);
    }
    
    /**
    * Fast authentication of a certain user
    * 
    * Returns a PEAR_Error if:
    *   o file doesn't exist
    *   o file couldn't be opened in read mode
    *   o file couldn't be locked exclusively
    *   o file couldn't be unlocked (only if auth fails)
    *   o file couldn't be closed (only if auth fails)
    *   o invalid encryption mode <var>$mode</var> was provided
    *
    * @static   call this method statically for a reasonable fast authentication
    * @access   public
    * @return   mixed   true if authenticated, false if not or PEAR_Error
    * @param    string  $file   path to passwd file
    * @param    string  $user   user to authenticate
    * @param    string  $pass   plaintext password
    * @param    string  $mode   encryption mode to use (des or md5)
    */
    function staticAuth($file, $user, $pass, $mode)
    {
        $line = File_Passwd_Common::_auth($file, $user);
        if (!$line || PEAR::isError($line)) {
            return $line;
        }
        list(,$real)= explode(':', $line);
        $crypted    = File_Passwd_Unix::_genPass($pass, $real, $mode);
        if (PEAR::isError($crypted)) {
            return $crypted;
        }
        return ($crypted === $real);
    }
    
    /**
    * Apply changes an rewrite passwd file
    *
    * Returns a PEAR_Error if:
    *   o directory in which the file should reside couldn't be created
    *   o file couldn't be opened in write mode
    *   o file couldn't be locked exclusively
    *   o file couldn't be unlocked
    *   o file couldn't be closed
    * 
    * @throws PEAR_Error
    * @access public
    * @return mixed true on success or PEAR_Error
    */
    function save()
    {
        $content = '';
        foreach ($this->_users as $user => $array){
            $pass   = array_shift($array);
            $extra  = implode(':', $array);
            $content .= $user . ':' . $pass;
            if (!empty($extra)) {
                $content .= ':' . $extra;
            }
            $content .= "\n";
        }
        return $this->_save($content);
    }
    
    /**
    * Parse the Unix password file
    *
    * Returns a PEAR_Error if passwd file has invalid format.
    * 
    * @throws PEAR_Error
    * @access public
    * @return mixed true on success or PEAR_Error
    */
    function parse()
    {
        $this->_users = array();
        foreach ($this->_contents as $line){
            $parts = explode(':', $line);
            if (count($parts) < 2) {
                return PEAR::raiseError(
                    FILE_PASSWD_E_INVALID_FORMAT_STR,
                    FILE_PASSWD_E_INVALID_FORMAT
                );
            }
            $user = array_shift($parts);
            $pass = array_shift($parts);
            if ($pass == 'x') {
                $this->_shadowed = true;
            }
            $values = array();
            if ($this->_usemap) {
                $values['pass'] = $pass;
                foreach ($parts as $i => $value){
                    if (isset($this->_map[$i])) {
                        $values[$this->_map[$i]] = $value;
                    } else {
                        $values[$i+1] = $value;
                    }
                }
            } else {
                $values = array_merge(array($pass), $parts);
            }
            $this->_users[$user] = $values;
            
        }
        $this->_contents = array();
        return true;
    }
    
    /**
    * Set the encryption mode
    * 
    * Supported encryption modes are des and md5.
    * 
    * Returns a PEAR_Error if supplied encryption mode is not supported.
    *
    * @see      setMode()
    * @see      listModes()
    * 
    * @throws   PEAR_Error
    * @access   public
    * @return   mixed   true on succes or PEAR_Error
    * @param    string  $mode   encryption mode to use; either md5 or des
    */
    function setMode($mode)
    {
        $mode = strToLower($mode);
        if (!isset($this->_modes[$mode])) {
            return PEAR::raiseError(
                sprintf(FILE_PASSWD_E_INVALID_ENC_MODE_STR, $mode),
                FILE_PASSWD_E_INVALID_ENC_MODE
            );
        }
        $this->_mode = $mode;
        return true;
    }
    
    /** 
    * Get supported encryption modes
    *
    * <pre>
    *   array
    *    + md5
    *    + des
    * </pre>
    * 
    * @see      setMode()
    * @see      getMode()
    * 
    * @access   public
    * @return   array
    */
    function listModes()
    {
        return $this->_modes;
    }

    /**
    * Get actual encryption mode
    *
    * @see      listModes()
    * @see      setMode()
    * 
    * @access   public
    * @return   string
    */
    function getMode()
    {
        return $this->_mode;
    }
    
    /**
    * Whether to use the 'name map' of the extra properties or not
    * 
    * Default Unix passwd files look like:
    * <pre>
    * user:password:user_id:group_id:gecos:home_dir:shell
    * </pre>
    * 
    * The default 'name map' for properties except user and password looks like:
    *   o uid
    *   o gid
    *   o gecos
    *   o home
    *   o shell
    * 
    * If you want to change the naming of the standard map use 
    * File_Passwd_Unix::setMap(array()).
    *
    * @see      setMap()
    * @see      getMap()
    * 
    * @access   public
    * @return   boolean always true if you set a value (true/false) OR
    *                   the actual value if called without param
    * 
    * @param    boolean $bool   whether to use the 'name map' or not
    */
    function useMap($bool = null)
    {
        if (is_null($bool)) {
            return $this->_usemap;
        }
        $this->_usemap = (bool) $bool;
        return true;
    }
    
    /**
    * Set the 'name map' to use with the extra properties of the user
    * 
    * This map is used for naming the associative array of the extra properties.
    *