acl.php

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<?php
/* SVN FILE: $Id: acl.php 7805 2008-10-30 17:30:26Z AD7six $ */
/**
 * Access Control List factory class.
 *
 * Permissions system.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework (http://www.cakephp.org)
 * Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright     Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 * @link          http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs.controller.components
 * @since         CakePHP(tm) v 0.10.0.1076
 * @version       $Revision: 7805 $
 * @modifiedby    $LastChangedBy: AD7six $
 * @lastmodified  $Date: 2008-10-30 13:30:26 -0400 (Thu, 30 Oct 2008) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Access Control List factory class.
 *
 * Looks for ACL implementation class in core config, and returns an instance of that class.
 *
 * @package       cake
 * @subpackage    cake.cake.libs.controller.components
 */
class AclComponent extends Object {
/**
 * Instance of an ACL class
 *
 * @var object
 * @access protected
 */
    var $_Instance = null;
/**
 * Constructor. Will return an instance of the correct ACL class.
 *
 */
    function __construct() {
        $name = Inflector::camelize(strtolower(Configure::read('Acl.classname')));
        if (!class_exists($name)) {
            if (App::import('Component', $name)) {
                if (strpos($name, '.') !== false) {
                    list($plugin, $name) = explode('.', $name);
                }
                $name .= 'Component';
            } else {
                trigger_error(sprintf(__('Could not find %s.', true), $name), E_USER_WARNING);
            }
        }
        $this->_Instance =& new $name();
        $this->_Instance->initialize($this);
    }
/**
 * Startup is not used
 *
 * @param object $controller Controller using this component
 * @return boolean Proceed with component usage (true), or fail (false)
 * @access public
 */
    function startup(&$controller) {
        return true;
    }
/**
 * Empty class defintion, to be overridden in subclasses.
 *
 * @access protected
 */
    function _initACL() {
    }
/**
 * Pass-thru function for ACL check instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function check($aro, $aco, $action = "*") {
        return $this->_Instance->check($aro, $aco, $action);
    }
/**
 * Pass-thru function for ACL allow instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function allow($aro, $aco, $action = "*") {
        return $this->_Instance->allow($aro, $aco, $action);
    }
/**
 * Pass-thru function for ACL deny instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function deny($aro, $aco, $action = "*") {
        return $this->_Instance->deny($aro, $aco, $action);
    }
/**
 * Pass-thru function for ACL inherit instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function inherit($aro, $aco, $action = "*") {
        return $this->_Instance->inherit($aro, $aco, $action);
    }
/**
 * Pass-thru function for ACL grant instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function grant($aro, $aco, $action = "*") {
        return $this->_Instance->grant($aro, $aco, $action);
    }
/**
 * Pass-thru function for ACL grant instance.
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function revoke($aro, $aco, $action = "*") {
        return $this->_Instance->revoke($aro, $aco, $action);
    }
}
/**
 * Access Control List abstract class. Not to be instantiated.
 * Subclasses of this class are used by AclComponent to perform ACL checks in Cake.
 *
 * @package       cake
 * @subpackage    cake.cake.libs.controller.components
 * @abstract
 */
class AclBase extends Object {
/**
 * This class should never be instantiated, just subclassed.
 *
 */
    function __construct() {
        if (strcasecmp(get_class($this), "AclBase") == 0 || !is_subclass_of($this, "AclBase")) {
            trigger_error(__("[acl_base] The AclBase class constructor has been called, or the class was instantiated. This class must remain abstract. Please refer to the Cake docs for ACL configuration.", true), E_USER_ERROR);
            return NULL;
        }
    }
/**
 * Empty method to be overridden in subclasses
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @access public
 */
    function check($aro, $aco, $action = "*") {
    }
/**
 * Empty method to be overridden in subclasses
 *
 * @param object $component Component
 * @access public
 */
    function initialize(&$component) {
    }
}
/**
 * In this file you can extend the AclBase.
 *
 * @package       cake
 * @subpackage    cake.cake.libs.model
 */
class DbAcl extends AclBase {
/**
 * Constructor
 *
 */
    function __construct() {
        parent::__construct();
        if (!class_exists('AclNode')) {
            uses('model' . DS . 'db_acl');
        }
        $this->Aro =& ClassRegistry::init(array('class' => 'Aro', 'alias' => 'Aro'));
        $this->Aco =& ClassRegistry::init(array('class' => 'Aco', 'alias' => 'Aco'));
    }
/**
 * Enter description here...
 *
 * @param object $component
 * @return void
 * @access public
 */
    function initialize(&$component) {
        $component->Aro = $this->Aro;
        $component->Aco = $this->Aco;
    }
/**
 * Checks if the given $aro has access to action $action in $aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $action Action (defaults to *)
 * @return boolean Success (true if ARO has access to action in ACO, false otherwise)
 * @access public
 */
    function check($aro, $aco, $action = "*") {
        if ($aro == null || $aco == null) {
            return false;
        }

        $permKeys = $this->_getAcoKeys($this->Aro->Permission->schema());
        $aroPath = $this->Aro->node($aro);
        $acoPath = $this->Aco->node($aco);

        if (empty($aroPath) || empty($acoPath)) {
            trigger_error("DbAcl::check() - Failed ARO/ACO node lookup in permissions check.  Node references:\nAro: " . print_r($aro, true) . "\nAco: " . print_r($aco, true), E_USER_WARNING);
            return false;
        }

        if ($acoPath == null || $acoPath == array()) {
            trigger_error("DbAcl::check() - Failed ACO node lookup in permissions check.  Node references:\nAro: " . print_r($aro, true) . "\nAco: " . print_r($aco, true), E_USER_WARNING);
            return false;
        }

        $aroNode = $aroPath[0];
        $acoNode = $acoPath[0];

        if ($action != '*' && !in_array('_' . $action, $permKeys)) {
            trigger_error(sprintf(__("ACO permissions key %s does not exist in DbAcl::check()", true), $action), E_USER_NOTICE);
            return false;
        }

        $inherited = array();
        $acoIDs = Set::extract($acoPath, '{n}.' . $this->Aco->alias . '.id');

        $count = count($aroPath);
        for ($i = 0 ; $i < $count; $i++) {
            $permAlias = $this->Aro->Permission->alias;

            $perms = $this->Aro->Permission->find('all', array(
                'conditions' => array(
                    "{$permAlias}.aro_id" => $aroPath[$i][$this->Aro->alias]['id'],
                    "{$permAlias}.aco_id" => $acoIDs
                ),
                'order' => array($this->Aco->alias . '.lft' => 'desc'),
                'recursive' => 0
            ));

            if (empty($perms)) {
                continue;
            } else {
                $perms = Set::extract($perms, '{n}.' . $this->Aro->Permission->alias);
                foreach ($perms as $perm) {
                    if ($action == '*') {

                        foreach ($permKeys as $key) {
                            if (!empty($perm)) {
                                if ($perm[$key] == -1) {
                                    return false;
                                } elseif ($perm[$key] == 1) {
                                    $inherited[$key] = 1;
                                }
                            }
                        }

                        if (count($inherited) === count($permKeys)) {
                            return true;
                        }
                    } else {
                        switch ($perm['_' . $action]) {
                            case -1:
                                return false;
                            case 0:
                                continue;
                            break;
                            case 1:
                                return true;
                            break;
                        }
                    }
                }
            }
        }
        return false;
    }
/**
 * Allow $aro to have access to action $actions in $aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $actions Action (defaults to *)
 * @param integer $value Value to indicate access type (1 to give access, -1 to deny, 0 to inherit)
 * @return boolean Success
 * @access public
 */
    function allow($aro, $aco, $actions = "*", $value = 1) {
        $perms = $this->getAclLink($aro, $aco);
        $permKeys = $this->_getAcoKeys($this->Aro->Permission->schema());
        $save = array();

        if ($perms == false) {
            trigger_error(__('DbAcl::allow() - Invalid node', true), E_USER_WARNING);
            return false;
        }
        if (isset($perms[0])) {
            $save = $perms[0][$this->Aro->Permission->alias];
        }

        if ($actions == "*") {
            $permKeys = $this->_getAcoKeys($this->Aro->Permission->schema());
            $save = array_combine($permKeys, array_pad(array(), count($permKeys), $value));
        } else {
            if (!is_array($actions)) {
                $actions = array('_' . $actions);
            }
            if (is_array($actions)) {
                foreach ($actions as $action) {
                    if ($action{0} != '_') {
                        $action = '_' . $action;
                    }
                    if (in_array($action, $permKeys)) {
                        $save[$action] = $value;
                    }
                }
            }
        }
        list($save['aro_id'], $save['aco_id']) = array($perms['aro'], $perms['aco']);

        if ($perms['link'] != null && count($perms['link']) > 0) {
            $save['id'] = $perms['link'][0][$this->Aro->Permission->alias]['id'];
        } else {
            unset($save['id']);
            $this->Aro->Permission->id = null;
        }
        return ($this->Aro->Permission->save($save) !== false);
    }
/**
 * Deny access for $aro to action $action in $aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $actions Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function deny($aro, $aco, $action = "*") {
        return $this->allow($aro, $aco, $action, -1);
    }
/**
 * Let access for $aro to action $action in $aco be inherited
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $actions Action (defaults to *)
 * @return boolean Success
 * @access public
 */
    function inherit($aro, $aco, $action = "*") {
        return $this->allow($aro, $aco, $action, 0);
    }
/**
 * Allow $aro to have access to action $actions in $aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $actions Action (defaults to *)
 * @return boolean Success
 * @see allow()
 * @access public
 */
    function grant($aro, $aco, $action = "*") {
        return $this->allow($aro, $aco, $action);
    }
/**
 * Deny access for $aro to action $action in $aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $actions Action (defaults to *)
 * @return boolean Success
 * @see deny()
 * @access public
 */
    function revoke($aro, $aco, $action = "*") {
        return $this->deny($aro, $aco, $action);
    }
/**
 * Get an array of access-control links between the given Aro and Aco
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @return array Indexed array with: 'aro', 'aco' and 'link'
 * @access public
 */
    function getAclLink($aro, $aco) {
        $obj = array();
        $obj['Aro'] = $this->Aro->node($aro);
        $obj['Aco'] = $this->Aco->node($aco);

        if (empty($obj['Aro']) || empty($obj['Aco'])) {
            return false;
        }

        return array(
            'aro' => Set::extract($obj, 'Aro.0.'.$this->Aro->alias.'.id'),
            'aco'  => Set::extract($obj, 'Aco.0.'.$this->Aco->alias.'.id'),
            'link' => $this->Aro->Permission->find('all', array('conditions' => array(
                $this->Aro->Permission->alias . '.aro_id' => Set::extract($obj, 'Aro.0.'.$this->Aro->alias.'.id'),
                $this->Aro->Permission->alias . '.aco_id' => Set::extract($obj, 'Aco.0.'.$this->Aco->alias.'.id')
            )))
        );
    }
/**
 * Get the keys used in an ACO
 *
 * @param array $keys Permission model info
 * @return array ACO keys
 * @access protected
 */
    function _getAcoKeys($keys) {
        $newKeys = array();
        $keys = array_keys($keys);
        foreach ($keys as $key) {
            if (!in_array($key, array('id', 'aro_id', 'aco_id'))) {
                $newKeys[] = $key;
            }
        }
        return $newKeys;
    }
}
/**
 * In this file you can extend the AclBase.
 *
 * @package       cake
 * @subpackage    cake.cake.libs.model.iniacl
 */
class IniAcl extends AclBase {
/**
 * Array with configuration, parsed from ini file
 *
 * @var array
 * @access public
 */
    var $config = null;
/**
 * The constructor must be overridden, as AclBase is abstract.
 *
 */
    function __construct() {
    }
/**
 * Main ACL check function. Checks to see if the ARO (access request object) has access to the ACO (access control object).
 * Looks at the acl.ini.php file for permissions (see instructions in /config/acl.ini.php).
 *
 * @param string $aro ARO
 * @param string $aco ACO
 * @param string $aco_action Action
 * @return boolean Success
 * @access public
 */
    function check($aro, $aco, $aco_action = null) {
        if ($this->config == null) {
            $this->config = $this->readConfigFile(CONFIGS . 'acl.ini.php');
        }
        $aclConfig = $this->config;

        if (isset($aclConfig[$aro]['deny'])) {
            $userDenies = $this->arrayTrim(explode(",", $aclConfig[$aro]['deny']));

            if (array_search($aco, $userDenies)) {
                return false;
            }
        }

        if (isset($aclConfig[$aro]['allow'])) {
            $userAllows = $this->arrayTrim(explode(",", $aclConfig[$aro]['allow']));

            if (array_search($aco, $userAllows)) {
                return true;
            }
        }

        if (isset($aclConfig[$aro]['groups'])) {
            $userGroups = $this->arrayTrim(explode(",", $aclConfig[$aro]['groups']));

            foreach ($userGroups as $group) {
                if (array_key_exists($group, $aclConfig)) {
                    if (isset($aclConfig[$group]['deny'])) {
                        $groupDenies=$this->arrayTrim(explode(",", $aclConfig[$group]['deny']));

                        if (array_search($aco, $groupDenies)) {
                            return false;
                        }
                    }

                    if (isset($aclConfig[$group]['allow'])) {
                        $groupAllows = $this->arrayTrim(explode(",", $aclConfig[$group]['allow']));

                        if (array_search($aco, $groupAllows)) {
                            return true;
                        }
                    }
                }
            }
        }
        return false;
    }
/**
 * Parses an INI file and returns an array that reflects the INI file's section structure. Double-quote friendly.
 *
 * @param string $fileName File
 * @return array INI section structure
 * @access public
 */
    function readConfigFile($fileName) {
        $fileLineArray = file($fileName);

        foreach ($fileLineArray as $fileLine) {
            $dataLine = trim($fileLine);
            $firstChar = substr($dataLine, 0, 1);

            if ($firstChar != ';' && $dataLine != '') {
                if ($firstChar == '[' && substr($dataLine, -1, 1) == ']') {
                    $sectionName = preg_replace('/[\[\]]/', '', $dataLine);
                } else {
                    $delimiter = strpos($dataLine, '=');

                    if ($delimiter > 0) {
                        $key = strtolower(trim(substr($dataLine, 0, $delimiter)));
                        $value = trim(substr($dataLine, $delimiter + 1));

                        if (substr($value, 0, 1) == '"' && substr($value, -1) == '"') {
                            $value = substr($value, 1, -1);
                        }

                        $iniSetting[$sectionName][$key]=stripcslashes($value);
                    } else {
                        if (!isset($sectionName)) {
                            $sectionName = '';
                        }

                        $iniSetting[$sectionName][strtolower(trim($dataLine))]='';
                    }
                }
            }
        }

        return $iniSetting;
    }
/**
 * Removes trailing spaces on all array elements (to prepare for searching)
 *
 * @param array $array Array to trim
 * @return array Trimmed array
 * @access public
 */
    function arrayTrim($array) {
        foreach ($array as $key => $value) {
            $array[$key] = trim($value);
        }
        array_unshift($array, "");
        return $array;
    }
}
?>

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