722 lines
24 KiB
PHP
Executable File
722 lines
24 KiB
PHP
Executable File
<?php
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/**
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* Smarty plugin
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*
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* @package Smarty
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* @subpackage Security
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* @author Uwe Tews
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*/
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/**
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* FIXME: Smarty_Security API
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* - getter and setter instead of public properties would allow cultivating an internal cache properly
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* - current implementation of isTrustedResourceDir() assumes that Smarty::$template_dir and Smarty::$config_dir
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* are immutable the cache is killed every time either of the variables change. That means that two distinct
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* Smarty objects with differing
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* $template_dir or $config_dir should NOT share the same Smarty_Security instance,
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* as this would lead to (severe) performance penalty! how should this be handled?
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*/
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/**
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* This class does contain the security settings
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*/
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class Smarty_Security
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{
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/**
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* This determines how Smarty handles "<?php ... ?>" tags in templates.
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* possible values:
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* <ul>
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* <li>Smarty::PHP_PASSTHRU -> echo PHP tags as they are</li>
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* <li>Smarty::PHP_QUOTE -> escape tags as entities</li>
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* <li>Smarty::PHP_REMOVE -> remove php tags</li>
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* <li>Smarty::PHP_ALLOW -> execute php tags</li>
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* </ul>
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*
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* @var integer
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*/
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public $php_handling = Smarty::PHP_PASSTHRU;
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/**
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* This is the list of template directories that are considered secure.
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* $template_dir is in this list implicitly.
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*
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* @var array
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*/
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public $secure_dir = array();
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/**
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* This is an array of directories where trusted php scripts reside.
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* {@link $security} is disabled during their inclusion/execution.
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*
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* @var array
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*/
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public $trusted_dir = array();
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/**
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* List of regular expressions (PCRE) that include trusted URIs
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*
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* @var array
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*/
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public $trusted_uri = array();
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/**
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* List of trusted constants names
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*
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* @var array
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*/
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public $trusted_constants = array();
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/**
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* This is an array of trusted static classes.
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* If empty access to all static classes is allowed.
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* If set to 'none' none is allowed.
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*
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* @var array
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*/
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public $static_classes = array();
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/**
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* This is an nested array of trusted classes and static methods.
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* If empty access to all static classes and methods is allowed.
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* Format:
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* array (
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* 'class_1' => array('method_1', 'method_2'), // allowed methods listed
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* 'class_2' => array(), // all methods of class allowed
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* )
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* If set to null none is allowed.
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*
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* @var array
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*/
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public $trusted_static_methods = array();
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/**
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* This is an array of trusted static properties.
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* If empty access to all static classes and properties is allowed.
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* Format:
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* array (
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* 'class_1' => array('prop_1', 'prop_2'), // allowed properties listed
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* 'class_2' => array(), // all properties of class allowed
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* )
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* If set to null none is allowed.
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*
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* @var array
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*/
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public $trusted_static_properties = array();
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/**
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* This is an array of trusted PHP functions.
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* If empty all functions are allowed.
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* To disable all PHP functions set $php_functions = null.
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*
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* @var array
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*/
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public $php_functions = array('isset', 'empty', 'count', 'sizeof', 'in_array', 'is_array', 'time',);
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/**
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* This is an array of trusted PHP modifiers.
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* If empty all modifiers are allowed.
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* To disable all modifier set $php_modifiers = null.
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*
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* @var array
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*/
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public $php_modifiers = array('escape', 'count', 'nl2br',);
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/**
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* This is an array of allowed tags.
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* If empty no restriction by allowed_tags.
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*
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* @var array
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*/
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public $allowed_tags = array();
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/**
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* This is an array of disabled tags.
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* If empty no restriction by disabled_tags.
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*
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* @var array
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*/
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public $disabled_tags = array();
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/**
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* This is an array of allowed modifier plugins.
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* If empty no restriction by allowed_modifiers.
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*
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* @var array
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*/
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public $allowed_modifiers = array();
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/**
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* This is an array of disabled modifier plugins.
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* If empty no restriction by disabled_modifiers.
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*
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* @var array
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*/
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public $disabled_modifiers = array();
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/**
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* This is an array of disabled special $smarty variables.
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*
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* @var array
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*/
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public $disabled_special_smarty_vars = array();
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/**
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* This is an array of trusted streams.
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* If empty all streams are allowed.
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* To disable all streams set $streams = null.
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*
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* @var array
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*/
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public $streams = array('file');
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/**
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* + flag if constants can be accessed from template
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*
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* @var boolean
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*/
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public $allow_constants = true;
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/**
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* + flag if super globals can be accessed from template
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*
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* @var boolean
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*/
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public $allow_super_globals = true;
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/**
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* max template nesting level
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*
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* @var int
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*/
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public $max_template_nesting = 0;
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/**
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* current template nesting level
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*
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* @var int
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*/
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private $_current_template_nesting = 0;
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/**
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* Cache for $resource_dir lookup
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*
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* @var array
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*/
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protected $_resource_dir = array();
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/**
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* Cache for $template_dir lookup
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*
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* @var array
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*/
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protected $_template_dir = array();
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/**
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* Cache for $config_dir lookup
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*
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* @var array
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*/
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protected $_config_dir = array();
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/**
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* Cache for $secure_dir lookup
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*
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* @var array
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*/
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protected $_secure_dir = array();
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/**
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* Cache for $php_resource_dir lookup
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*
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* @var array
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*/
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protected $_php_resource_dir = null;
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/**
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* Cache for $trusted_dir lookup
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*
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* @var array
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*/
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protected $_trusted_dir = null;
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/**
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* Cache for include path status
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*
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* @var bool
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*/
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protected $_include_path_status = false;
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/**
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* Cache for $_include_array lookup
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*
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* @var array
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*/
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protected $_include_dir = array();
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/**
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* @param Smarty $smarty
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*/
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public function __construct($smarty)
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{
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$this->smarty = $smarty;
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}
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/**
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* Check if PHP function is trusted.
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*
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* @param string $function_name
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* @param object $compiler compiler object
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*
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* @return boolean true if function is trusted
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*/
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public function isTrustedPhpFunction($function_name, $compiler)
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{
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if (isset($this->php_functions)
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&& (empty($this->php_functions) || in_array($function_name, $this->php_functions))
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) {
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return true;
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}
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$compiler->trigger_template_error("PHP function '{$function_name}' not allowed by security setting");
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if static class is trusted.
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*
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* @param string $class_name
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* @param object $compiler compiler object
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*
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* @return boolean true if class is trusted
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*/
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public function isTrustedStaticClass($class_name, $compiler)
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{
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if (isset($this->static_classes)
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&& (empty($this->static_classes) || in_array($class_name, $this->static_classes))
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) {
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return true;
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}
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$compiler->trigger_template_error("access to static class '{$class_name}' not allowed by security setting");
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if static class method/property is trusted.
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*
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* @param string $class_name
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* @param string $params
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* @param object $compiler compiler object
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*
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* @return boolean true if class method is trusted
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*/
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public function isTrustedStaticClassAccess($class_name, $params, $compiler)
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{
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if (!isset($params[ 2 ])) {
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// fall back
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return $this->isTrustedStaticClass($class_name, $compiler);
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}
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if ($params[ 2 ] === 'method') {
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$allowed = $this->trusted_static_methods;
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$name = substr($params[ 0 ], 0, strpos($params[ 0 ], '('));
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} else {
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$allowed = $this->trusted_static_properties;
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// strip '$'
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$name = substr($params[ 0 ], 1);
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}
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if (isset($allowed)) {
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if (empty($allowed)) {
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// fall back
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return $this->isTrustedStaticClass($class_name, $compiler);
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}
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if (isset($allowed[ $class_name ])
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&& (empty($allowed[ $class_name ]) || in_array($name, $allowed[ $class_name ]))
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) {
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return true;
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}
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}
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$compiler->trigger_template_error("access to static class '{$class_name}' {$params[2]} '{$name}' not allowed by security setting");
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if PHP modifier is trusted.
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*
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* @param string $modifier_name
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* @param object $compiler compiler object
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*
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* @return boolean true if modifier is trusted
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*/
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public function isTrustedPhpModifier($modifier_name, $compiler)
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{
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if (isset($this->php_modifiers)
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&& (empty($this->php_modifiers) || in_array($modifier_name, $this->php_modifiers))
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) {
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return true;
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}
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$compiler->trigger_template_error("modifier '{$modifier_name}' not allowed by security setting");
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if tag is trusted.
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*
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* @param string $tag_name
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* @param object $compiler compiler object
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*
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* @return boolean true if tag is trusted
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*/
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public function isTrustedTag($tag_name, $compiler)
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{
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// check for internal always required tags
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if (in_array(
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$tag_name,
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array(
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'assign', 'call', 'private_filter', 'private_block_plugin', 'private_function_plugin',
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'private_object_block_function', 'private_object_function', 'private_registered_function',
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'private_registered_block', 'private_special_variable', 'private_print_expression',
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'private_modifier'
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)
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)
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) {
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return true;
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}
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// check security settings
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if (empty($this->allowed_tags)) {
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if (empty($this->disabled_tags) || !in_array($tag_name, $this->disabled_tags)) {
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return true;
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} else {
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$compiler->trigger_template_error("tag '{$tag_name}' disabled by security setting", null, true);
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}
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} elseif (in_array($tag_name, $this->allowed_tags) && !in_array($tag_name, $this->disabled_tags)) {
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return true;
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} else {
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$compiler->trigger_template_error("tag '{$tag_name}' not allowed by security setting", null, true);
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}
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if special $smarty variable is trusted.
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*
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* @param string $var_name
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* @param object $compiler compiler object
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*
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* @return boolean true if tag is trusted
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*/
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public function isTrustedSpecialSmartyVar($var_name, $compiler)
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{
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if (!in_array($var_name, $this->disabled_special_smarty_vars)) {
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return true;
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} else {
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$compiler->trigger_template_error(
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"special variable '\$smarty.{$var_name}' not allowed by security setting",
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null,
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true
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);
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}
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if modifier plugin is trusted.
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*
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* @param string $modifier_name
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* @param object $compiler compiler object
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*
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* @return boolean true if tag is trusted
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*/
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public function isTrustedModifier($modifier_name, $compiler)
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{
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// check for internal always allowed modifier
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if (in_array($modifier_name, array('default'))) {
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return true;
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}
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// check security settings
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if (empty($this->allowed_modifiers)) {
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if (empty($this->disabled_modifiers) || !in_array($modifier_name, $this->disabled_modifiers)) {
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return true;
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} else {
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$compiler->trigger_template_error(
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"modifier '{$modifier_name}' disabled by security setting",
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null,
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true
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);
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}
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} elseif (in_array($modifier_name, $this->allowed_modifiers)
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&& !in_array($modifier_name, $this->disabled_modifiers)
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) {
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return true;
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} else {
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$compiler->trigger_template_error(
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"modifier '{$modifier_name}' not allowed by security setting",
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null,
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true
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);
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}
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return false; // should not, but who knows what happens to the compiler in the future?
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}
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/**
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* Check if constants are enabled or trusted
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*
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* @param string $const constant name
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* @param object $compiler compiler object
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*
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* @return bool
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*/
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public function isTrustedConstant($const, $compiler)
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{
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if (in_array($const, array('true', 'false', 'null'))) {
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return true;
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}
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if (!empty($this->trusted_constants)) {
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if (!in_array(strtolower($const), $this->trusted_constants)) {
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$compiler->trigger_template_error("Security: access to constant '{$const}' not permitted");
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return false;
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}
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return true;
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}
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if ($this->allow_constants) {
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return true;
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}
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$compiler->trigger_template_error("Security: access to constants not permitted");
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return false;
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}
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/**
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* Check if stream is trusted.
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*
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* @param string $stream_name
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*
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* @return boolean true if stream is trusted
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* @throws SmartyException if stream is not trusted
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*/
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public function isTrustedStream($stream_name)
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{
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if (isset($this->streams) && (empty($this->streams) || in_array($stream_name, $this->streams))) {
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return true;
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}
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throw new SmartyException("stream '{$stream_name}' not allowed by security setting");
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}
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/**
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* Check if directory of file resource is trusted.
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*
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* @param string $filepath
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* @param null|bool $isConfig
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*
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* @return bool true if directory is trusted
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* @throws \SmartyException if directory is not trusted
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*/
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public function isTrustedResourceDir($filepath, $isConfig = null)
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{
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if ($this->_include_path_status !== $this->smarty->use_include_path) {
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$_dir =
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$this->smarty->use_include_path ? $this->smarty->ext->_getIncludePath->getIncludePathDirs($this->smarty) : array();
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if ($this->_include_dir !== $_dir) {
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$this->_updateResourceDir($this->_include_dir, $_dir);
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$this->_include_dir = $_dir;
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}
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$this->_include_path_status = $this->smarty->use_include_path;
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}
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$_dir = $this->smarty->getTemplateDir();
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if ($this->_template_dir !== $_dir) {
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$this->_updateResourceDir($this->_template_dir, $_dir);
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$this->_template_dir = $_dir;
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}
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$_dir = $this->smarty->getConfigDir();
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if ($this->_config_dir !== $_dir) {
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$this->_updateResourceDir($this->_config_dir, $_dir);
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$this->_config_dir = $_dir;
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}
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if ($this->_secure_dir !== $this->secure_dir) {
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$this->secure_dir = (array)$this->secure_dir;
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foreach ($this->secure_dir as $k => $d) {
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$this->secure_dir[ $k ] = $this->smarty->_realpath($d . DIRECTORY_SEPARATOR, true);
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}
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$this->_updateResourceDir($this->_secure_dir, $this->secure_dir);
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$this->_secure_dir = $this->secure_dir;
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}
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$addPath = $this->_checkDir($filepath, $this->_resource_dir);
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if ($addPath !== false) {
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$this->_resource_dir = array_merge($this->_resource_dir, $addPath);
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}
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return true;
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}
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/**
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* Check if URI (e.g. {fetch} or {html_image}) is trusted
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* To simplify things, isTrustedUri() resolves all input to "{$PROTOCOL}://{$HOSTNAME}".
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* So "http://username:password@hello.world.example.org:8080/some-path?some=query-string"
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* is reduced to "http://hello.world.example.org" prior to applying the patters from {@link $trusted_uri}.
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*
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* @param string $uri
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*
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* @return boolean true if URI is trusted
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* @throws SmartyException if URI is not trusted
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* @uses $trusted_uri for list of patterns to match against $uri
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*/
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public function isTrustedUri($uri)
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{
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$_uri = parse_url($uri);
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if (!empty($_uri[ 'scheme' ]) && !empty($_uri[ 'host' ])) {
|
|
$_uri = $_uri[ 'scheme' ] . '://' . $_uri[ 'host' ];
|
|
foreach ($this->trusted_uri as $pattern) {
|
|
if (preg_match($pattern, $_uri)) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
throw new SmartyException("URI '{$uri}' not allowed by security setting");
|
|
}
|
|
|
|
/**
|
|
* Check if directory of file resource is trusted.
|
|
*
|
|
* @param string $filepath
|
|
*
|
|
* @return boolean true if directory is trusted
|
|
* @throws SmartyException if PHP directory is not trusted
|
|
*/
|
|
public function isTrustedPHPDir($filepath)
|
|
{
|
|
if (empty($this->trusted_dir)) {
|
|
throw new SmartyException("directory '{$filepath}' not allowed by security setting (no trusted_dir specified)");
|
|
}
|
|
// check if index is outdated
|
|
if (!$this->_trusted_dir || $this->_trusted_dir !== $this->trusted_dir) {
|
|
$this->_php_resource_dir = array();
|
|
$this->_trusted_dir = $this->trusted_dir;
|
|
foreach ((array)$this->trusted_dir as $directory) {
|
|
$directory = $this->smarty->_realpath($directory . '/', true);
|
|
$this->_php_resource_dir[ $directory ] = true;
|
|
}
|
|
}
|
|
$addPath = $this->_checkDir($filepath, $this->_php_resource_dir);
|
|
if ($addPath !== false) {
|
|
$this->_php_resource_dir = array_merge($this->_php_resource_dir, $addPath);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Remove old directories and its sub folders, add new directories
|
|
*
|
|
* @param array $oldDir
|
|
* @param array $newDir
|
|
*/
|
|
private function _updateResourceDir($oldDir, $newDir)
|
|
{
|
|
foreach ($oldDir as $directory) {
|
|
// $directory = $this->smarty->_realpath($directory, true);
|
|
$length = strlen($directory);
|
|
foreach ($this->_resource_dir as $dir) {
|
|
if (substr($dir, 0, $length) === $directory) {
|
|
unset($this->_resource_dir[ $dir ]);
|
|
}
|
|
}
|
|
}
|
|
foreach ($newDir as $directory) {
|
|
// $directory = $this->smarty->_realpath($directory, true);
|
|
$this->_resource_dir[ $directory ] = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if file is inside a valid directory
|
|
*
|
|
* @param string $filepath
|
|
* @param array $dirs valid directories
|
|
*
|
|
* @return array|bool
|
|
* @throws \SmartyException
|
|
*/
|
|
private function _checkDir($filepath, $dirs)
|
|
{
|
|
$directory = dirname($this->smarty->_realpath($filepath, true)) . DIRECTORY_SEPARATOR;
|
|
$_directory = array();
|
|
if (!preg_match('#[\\\\/][.][.][\\\\/]#', $directory)) {
|
|
while (true) {
|
|
// test if the directory is trusted
|
|
if (isset($dirs[ $directory ])) {
|
|
return $_directory;
|
|
}
|
|
// abort if we've reached root
|
|
if (!preg_match('#[\\\\/][^\\\\/]+[\\\\/]$#', $directory)) {
|
|
// give up
|
|
break;
|
|
}
|
|
// remember the directory to add it to _resource_dir in case we're successful
|
|
$_directory[ $directory ] = true;
|
|
// bubble up one level
|
|
$directory = preg_replace('#[\\\\/][^\\\\/]+[\\\\/]$#', DIRECTORY_SEPARATOR, $directory);
|
|
}
|
|
}
|
|
// give up
|
|
throw new SmartyException(sprintf('Smarty Security: not trusted file path \'%s\' ', $filepath));
|
|
}
|
|
|
|
/**
|
|
* Loads security class and enables security
|
|
*
|
|
* @param \Smarty $smarty
|
|
* @param string|Smarty_Security $security_class if a string is used, it must be class-name
|
|
*
|
|
* @return \Smarty current Smarty instance for chaining
|
|
* @throws \SmartyException when an invalid class name is provided
|
|
*/
|
|
public static function enableSecurity(Smarty $smarty, $security_class)
|
|
{
|
|
if ($security_class instanceof Smarty_Security) {
|
|
$smarty->security_policy = $security_class;
|
|
return $smarty;
|
|
} elseif (is_object($security_class)) {
|
|
throw new SmartyException("Class '" . get_class($security_class) . "' must extend Smarty_Security.");
|
|
}
|
|
if ($security_class === null) {
|
|
$security_class = $smarty->security_class;
|
|
}
|
|
if (!class_exists($security_class)) {
|
|
throw new SmartyException("Security class '$security_class' is not defined");
|
|
} elseif ($security_class !== 'Smarty_Security' && !is_subclass_of($security_class, 'Smarty_Security')) {
|
|
throw new SmartyException("Class '$security_class' must extend Smarty_Security.");
|
|
} else {
|
|
$smarty->security_policy = new $security_class($smarty);
|
|
}
|
|
return $smarty;
|
|
}
|
|
|
|
/**
|
|
* Start template processing
|
|
*
|
|
* @param $template
|
|
*
|
|
* @throws SmartyException
|
|
*/
|
|
public function startTemplate($template)
|
|
{
|
|
if ($this->max_template_nesting > 0 && $this->_current_template_nesting++ >= $this->max_template_nesting) {
|
|
throw new SmartyException("maximum template nesting level of '{$this->max_template_nesting}' exceeded when calling '{$template->template_resource}'");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Exit template processing
|
|
*/
|
|
public function endTemplate()
|
|
{
|
|
if ($this->max_template_nesting > 0) {
|
|
$this->_current_template_nesting--;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Register callback functions call at start/end of template rendering
|
|
*
|
|
* @param \Smarty_Internal_Template $template
|
|
*/
|
|
public function registerCallBacks(Smarty_Internal_Template $template)
|
|
{
|
|
$template->startRenderCallbacks[] = array($this, 'startTemplate');
|
|
$template->endRenderCallbacks[] = array($this, 'endTemplate');
|
|
}
|
|
}
|