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<?php
/**
* Smarty plugin
*
* @package Smarty
* @subpackage Security
* @author Uwe Tews
*/
/**
* This class does contain the security settings
*/
class Smarty_Security {
/**
* This determines how Smarty handles "<?php ... ?>" tags in templates.
* possible values:
* <ul>
* <li>Smarty::PHP_PASSTHRU -> echo PHP tags as they are</li>
* <li>Smarty::PHP_QUOTE -> escape tags as entities</li>
* <li>Smarty::PHP_REMOVE -> remove php tags</li>
* <li>Smarty::PHP_ALLOW -> execute php tags</li>
* </ul>
*
* @var integer
*/
public $php_handling = Smarty::PHP_PASSTHRU;
/**
* This is the list of template directories that are considered secure.
* $template_dir is in this list implicitly.
*
* @var array
*/
public $secure_dir = array();
/**
* This is an array of directories where trusted php scripts reside.
* {@link $security} is disabled during their inclusion/execution.
*
* @var array
*/
public $trusted_dir = array();
/**
* This is an array of trusted static classes.
*
* If empty access to all static classes is allowed.
* If set to 'none' none is allowed.
* @var array
*/
public $static_classes = array();
/**
* This is an array of trusted PHP functions.
*
* If empty all functions are allowed.
* To disable all PHP functions set $php_functions = null.
* @var array
*/
public $php_functions = array('isset', 'empty',
'count', 'sizeof','in_array', 'is_array','time','nl2br');
/**
* This is an array of trusted PHP modifers.
*
* If empty all modifiers are allowed.
* To disable all modifier set $modifiers = null.
* @var array
*/
public $php_modifiers = array('escape','count');
/**
* This is an array of trusted streams.
*
* If empty all streams are allowed.
* To disable all streams set $streams = null.
* @var array
*/
public $streams = array('file');
/**
* + flag if constants can be accessed from template
*/
public $allow_constants = true;
/**
* + flag if super globals can be accessed from template
*/
public $allow_super_globals = true;
/**
* + flag if the {php} and {include_php} tag can be executed
*/
public $allow_php_tag = false;
public function __construct($smarty)
{
$this->smarty = $smarty;
}
/**
* Check if PHP function is trusted.
*
* @param string $function_name
* @param object $compiler compiler object
* @return boolean true if function is trusted
*/
function isTrustedPhpFunction($function_name, $compiler)
{
if (isset($this->php_functions) && (empty($this->php_functions) || in_array($function_name, $this->php_functions))) {
return true;
} else {
$compiler->trigger_template_error ("PHP function '{$function_name}' not allowed by security setting");
return false;
}
}
/**
* Check if static class is trusted.
*
* @param string $class_name
* @param object $compiler compiler object
* @return boolean true if class is trusted
*/
function isTrustedStaticClass($class_name, $compiler)
{
if (isset($this->static_classes) && (empty($this->static_classes) || in_array($class_name, $this->static_classes))) {
return true;
} else {
$compiler->trigger_template_error ("access to static class '{$class_name}' not allowed by security setting");
return false;
}
}
/**
* Check if modifier is trusted.
*
* @param string $modifier_name
* @param object $compiler compiler object
* @return boolean true if modifier is trusted
*/
function isTrustedModifier($modifier_name, $compiler)
{
if (isset($this->php_modifiers) && (empty($this->php_modifiers) || in_array($modifier_name, $this->php_modifiers))) {
return true;
} else {
$compiler->trigger_template_error ("modifier '{$modifier_name}' not allowed by security setting");
return false;
}
}
/**
* Check if stream is trusted.
*
* @param string $stream_name
* @param object $compiler compiler object
* @return boolean true if stream is trusted
*/
function isTrustedStream($stream_name)
{
if (isset($this->streams) && (empty($this->streams) || in_array($stream_name, $this->streams))) {
return true;
} else {
throw new SmartyException ("stream '{$stream_name}' not allowed by security setting");
return false;
}
}
/**
* Check if directory of file resource is trusted.
*
* @param string $filepath
* @param object $compiler compiler object
* @return boolean true if directory is trusted
*/
function isTrustedResourceDir($filepath)
{
$_rp = realpath($filepath);
if (isset($this->smarty->template_dir)) {
foreach ((array)$this->smarty->template_dir as $curr_dir) {
if (($_cd = realpath($curr_dir)) !== false &&
strncmp($_rp, $_cd, strlen($_cd)) == 0 &&
(strlen($_rp) == strlen($_cd) || substr($_rp, strlen($_cd), 1) == DS)) {
return true;
}
}
}
if (!empty($this->smarty->security_policy->secure_dir)) {
foreach ((array)$this->smarty->security_policy->secure_dir as $curr_dir) {
if (($_cd = realpath($curr_dir)) !== false) {
if ($_cd == $_rp) {
return true;
} elseif (strncmp($_rp, $_cd, strlen($_cd)) == 0 &&
(strlen($_rp) == strlen($_cd) || substr($_rp, strlen($_cd), 1) == DS)) {
return true;
}
}
}
}
throw new SmartyException ("directory '{$_rp}' not allowed by security setting");
return false;
}
/**
* Check if directory of file resource is trusted.
*
* @param string $filepath
* @param object $compiler compiler object
* @return boolean true if directory is trusted
*/
function isTrustedPHPDir($filepath)
{
$_rp = realpath($filepath);
if (!empty($this->trusted_dir)) {
foreach ((array)$this->trusted_dir as $curr_dir) {
if (($_cd = realpath($curr_dir)) !== false) {
if ($_cd == $_rp) {
return true;
} elseif (strncmp($_rp, $_cd, strlen($_cd)) == 0 &&
substr($_rp, strlen($_cd), 1) == DS) {
return true;
}
}
}
}
throw new SmartyException ("directory '{$_rp}' not allowed by security setting");
return false;
}
}
?>