561 lines
15 KiB
PHP
561 lines
15 KiB
PHP
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<?php
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/**
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* Smarty plugin
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*
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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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namespace Smarty;
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use Smarty\Exception;
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/**
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* This class does contain the security settings
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*/
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#[\AllowDynamicProperties]
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class Security {
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = [];
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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 = ['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 = [];
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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 = [];
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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 = [];
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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 = [];
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/**
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* @param Smarty $smarty
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*/
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public function __construct(Smarty $smarty) {
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$this->smarty = $smarty;
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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, $compiler) {
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if (isset($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, $compiler) {
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if (!isset($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 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, $compiler) {
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$tag_name = strtolower($tag_name);
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// check for internal always required tags
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if (in_array($tag_name, ['assign', 'call'])) {
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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, $compiler) {
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if (!in_array($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, $compiler) {
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// check for internal always allowed modifier
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if (in_array($modifier_name, ['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, $compiler) {
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if (in_array($const, ['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 $stream_name
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*
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* @return boolean true if stream is trusted
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* @throws Exception if stream is not trusted
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*/
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public function isTrustedStream($stream_name) {
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if (isset($this->streams) && (empty($this->streams) || in_array($stream_name, $this->streams))) {
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return true;
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}
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throw new Exception("stream '{$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 $isConfig
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*
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* @return bool true if directory is trusted
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* @throws \Smarty\Exception if directory is not trusted
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*/
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public function isTrustedResourceDir($filepath, $isConfig = null) {
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$_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);
|
||
|
|
}
|
||
|
|
$this->_updateResourceDir($this->_secure_dir, $this->secure_dir);
|
||
|
|
$this->_secure_dir = $this->secure_dir;
|
||
|
|
}
|
||
|
|
$addPath = $this->_checkDir($filepath, $this->_resource_dir);
|
||
|
|
if ($addPath !== false) {
|
||
|
|
$this->_resource_dir = array_merge($this->_resource_dir, $addPath);
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Check if URI (e.g. {fetch} or {html_image}) is trusted
|
||
|
|
* To simplify things, isTrustedUri() resolves all input to "{$PROTOCOL}://{$HOSTNAME}".
|
||
|
|
* So "http://username:password@hello.world.example.org:8080/some-path?some=query-string"
|
||
|
|
* is reduced to "http://hello.world.example.org" prior to applying the patters from {@link $trusted_uri}.
|
||
|
|
*
|
||
|
|
* @param string $uri
|
||
|
|
*
|
||
|
|
* @return boolean true if URI is trusted
|
||
|
|
* @throws Exception if URI is not trusted
|
||
|
|
* @uses $trusted_uri for list of patterns to match against $uri
|
||
|
|
*/
|
||
|
|
public function isTrustedUri($uri) {
|
||
|
|
$_uri = parse_url($uri);
|
||
|
|
if (!empty($_uri['scheme']) && !empty($_uri['host'])) {
|
||
|
|
$_uri = $_uri['scheme'] . '://' . $_uri['host'];
|
||
|
|
foreach ($this->trusted_uri as $pattern) {
|
||
|
|
if (preg_match($pattern, $_uri)) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
throw new Exception("URI '{$uri}' not allowed by security setting");
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 $dirs valid directories
|
||
|
|
*
|
||
|
|
* @return array|bool
|
||
|
|
* @throws \Smarty\Exception
|
||
|
|
*/
|
||
|
|
private function _checkDir($filepath, $dirs) {
|
||
|
|
$directory = dirname($this->smarty->_realpath($filepath, true)) . DIRECTORY_SEPARATOR;
|
||
|
|
$_directory = [];
|
||
|
|
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 Exception(sprintf('Smarty Security: not trusted file path \'%s\' ', $filepath));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Loads security class and enables security
|
||
|
|
*
|
||
|
|
* @param \Smarty $smarty
|
||
|
|
* @param string|Security $security_class if a string is used, it must be class-name
|
||
|
|
*
|
||
|
|
* @return \Smarty current Smarty instance for chaining
|
||
|
|
* @throws \Smarty\Exception when an invalid class name is provided
|
||
|
|
*/
|
||
|
|
public static function enableSecurity(Smarty $smarty, $security_class) {
|
||
|
|
if ($security_class instanceof Security) {
|
||
|
|
$smarty->security_policy = $security_class;
|
||
|
|
return $smarty;
|
||
|
|
} elseif (is_object($security_class)) {
|
||
|
|
throw new Exception("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 Exception("Security class '$security_class' is not defined");
|
||
|
|
} elseif ($security_class !== Security::class && !is_subclass_of($security_class, Security::class)) {
|
||
|
|
throw new Exception("Class '$security_class' must extend " . Security::class . ".");
|
||
|
|
} else {
|
||
|
|
$smarty->security_policy = new $security_class($smarty);
|
||
|
|
}
|
||
|
|
return $smarty;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Start template processing
|
||
|
|
*
|
||
|
|
* @param $template
|
||
|
|
*
|
||
|
|
* @throws Exception
|
||
|
|
*/
|
||
|
|
public function startTemplate($template) {
|
||
|
|
if ($this->max_template_nesting > 0 && $this->_current_template_nesting++ >= $this->max_template_nesting) {
|
||
|
|
throw new Exception("maximum template nesting level of '{$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\Template $template
|
||
|
|
*/
|
||
|
|
public function registerCallBacks(Template $template) {
|
||
|
|
$template->startRenderCallbacks[] = [$this, 'startTemplate'];
|
||
|
|
$template->endRenderCallbacks[] = [$this, 'endTemplate'];
|
||
|
|
}
|
||
|
|
}
|