PHP Classes

File: Smarty/libs/sysplugins/smarty_security.php

Recommend this page to a friend!
  Classes of Isaac Trenado Mx   FDSSmarty   Smarty/libs/sysplugins/smarty_security.php   Download  
File: Smarty/libs/sysplugins/smarty_security.php
Role: Auxiliary script
Content type: text/plain
Description: Auxiliary script
Class: FDSSmarty
Load and display views using Smarty
Author: By
Last change:
Date: 8 years ago
Size: 16,210 bytes
 

Contents

Class file image Download
<?php /** * Smarty plugin * * @package Smarty * @subpackage Security * @author Uwe Tews */ /* * FIXME: Smarty_Security API * - getter and setter instead of public properties would allow cultivating an internal cache properly * - current implementation of isTrustedResourceDir() assumes that Smarty::$template_dir and Smarty::$config_dir are immutable * the cache is killed every time either of the variables change. That means that two distinct Smarty objects with differing * $template_dir or $config_dir should NOT share the same Smarty_Security instance, * as this would lead to (severe) performance penalty! how should this be handled? */ /** * 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(); /** * List of regular expressions (PCRE) that include trusted URIs * * @var array */ public $trusted_uri = 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 modifiers. * * 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 allowed tags. * * If empty no restriction by allowed_tags. * @var array */ public $allowed_tags = array(); /** * This is an array of disabled tags. * * If empty no restriction by disabled_tags. * @var array */ public $disabled_tags = array(); /** * This is an array of allowed modifier plugins. * * If empty no restriction by allowed_modifiers. * @var array */ public $allowed_modifiers = array(); /** * This is an array of disabled modifier plugins. * * If empty no restriction by disabled_modifiers. * @var array */ public $disabled_modifiers = array(); /** * 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 * @var boolean */ public $allow_constants = true; /** * + flag if super globals can be accessed from template * @var boolean */ public $allow_super_globals = true; /** * Cache for $resource_dir lookups * @var array */ protected $_resource_dir = null; /** * Cache for $template_dir lookups * @var array */ protected $_template_dir = null; /** * Cache for $config_dir lookups * @var array */ protected $_config_dir = null; /** * Cache for $secure_dir lookups * @var array */ protected $_secure_dir = null; /** * Cache for $php_resource_dir lookups * @var array */ protected $_php_resource_dir = null; /** * Cache for $trusted_dir lookups * @var array */ protected $_trusted_dir = null; /** * @param Smarty $smarty */ public function __construct($smarty) { $this->smarty = $smarty; } /** * Check if PHP function is trusted. * * @param string $function_name * @param object $compiler compiler object * @return boolean true if function is trusted * @throws SmartyCompilerException if php function is not trusted */ public function isTrustedPhpFunction($function_name, $compiler) { if (isset($this->php_functions) && (empty($this->php_functions) || in_array($function_name, $this->php_functions))) { return true; } $compiler->trigger_template_error("PHP function '{$function_name}' not allowed by security setting"); return false; // should not, but who knows what happens to the compiler in the future? } /** * Check if static class is trusted. * * @param string $class_name * @param object $compiler compiler object * @return boolean true if class is trusted * @throws SmartyCompilerException if static class is not trusted */ public function isTrustedStaticClass($class_name, $compiler) { if (isset($this->static_classes) && (empty($this->static_classes) || in_array($class_name, $this->static_classes))) { return true; } $compiler->trigger_template_error("access to static class '{$class_name}' not allowed by security setting"); return false; // should not, but who knows what happens to the compiler in the future? } /** * Check if PHP modifier is trusted. * * @param string $modifier_name * @param object $compiler compiler object * @return boolean true if modifier is trusted * @throws SmartyCompilerException if modifier is not trusted */ public function isTrustedPhpModifier($modifier_name, $compiler) { if (isset($this->php_modifiers) && (empty($this->php_modifiers) || in_array($modifier_name, $this->php_modifiers))) { return true; } $compiler->trigger_template_error("modifier '{$modifier_name}' not allowed by security setting"); return false; // should not, but who knows what happens to the compiler in the future? } /** * Check if tag is trusted. * * @param string $tag_name * @param object $compiler compiler object * @return boolean true if tag is trusted * @throws SmartyCompilerException if modifier is not trusted */ public function isTrustedTag($tag_name, $compiler) { // check for internal always required tags if (in_array($tag_name, array('assign', 'call', 'private_filter', 'private_block_plugin', 'private_function_plugin', 'private_object_block_function', 'private_object_function', 'private_registered_function', 'private_registered_block', 'private_special_variable', 'private_print_expression', 'private_modifier'))) { return true; } // check security settings if (empty($this->allowed_tags)) { if (empty($this->disabled_tags) || !in_array($tag_name, $this->disabled_tags)) { return true; } else { $compiler->trigger_template_error("tag '{$tag_name}' disabled by security setting", $compiler->lex->taglineno); } } elseif (in_array($tag_name, $this->allowed_tags) && !in_array($tag_name, $this->disabled_tags)) { return true; } else { $compiler->trigger_template_error("tag '{$tag_name}' not allowed by security setting", $compiler->lex->taglineno); } return false; // should not, but who knows what happens to the compiler in the future? } /** * Check if modifier plugin is trusted. * * @param string $modifier_name * @param object $compiler compiler object * @return boolean true if tag is trusted * @throws SmartyCompilerException if modifier is not trusted */ public function isTrustedModifier($modifier_name, $compiler) { // check for internal always allowed modifier if (in_array($modifier_name, array('default'))) { return true; } // check security settings if (empty($this->allowed_modifiers)) { if (empty($this->disabled_modifiers) || !in_array($modifier_name, $this->disabled_modifiers)) { return true; } else { $compiler->trigger_template_error("modifier '{$modifier_name}' disabled by security setting", $compiler->lex->taglineno); } } elseif (in_array($modifier_name, $this->allowed_modifiers) && !in_array($modifier_name, $this->disabled_modifiers)) { return true; } else { $compiler->trigger_template_error("modifier '{$modifier_name}' not allowed by security setting", $compiler->lex->taglineno); } return false; // should not, but who knows what happens to the compiler in the future? } /** * Check if stream is trusted. * * @param string $stream_name * @return boolean true if stream is trusted * @throws SmartyException if stream is not trusted */ public function isTrustedStream($stream_name) { if (isset($this->streams) && (empty($this->streams) || in_array($stream_name, $this->streams))) { return true; } throw new SmartyException("stream '{$stream_name}' not allowed by security setting"); } /** * Check if directory of file resource is trusted. * * @param string $filepath * @return boolean true if directory is trusted * @throws SmartyException if directory is not trusted */ public function isTrustedResourceDir($filepath) { $_template = false; $_config = false; $_secure = false; $_template_dir = $this->smarty->getTemplateDir(); $_config_dir = $this->smarty->getConfigDir(); // check if index is outdated if ((!$this->_template_dir || $this->_template_dir !== $_template_dir) || (!$this->_config_dir || $this->_config_dir !== $_config_dir) || (!empty($this->secure_dir) && (!$this->_secure_dir || $this->_secure_dir !== $this->secure_dir)) ) { $this->_resource_dir = array(); $_template = true; $_config = true; $_secure = !empty($this->secure_dir); } // rebuild template dir index if ($_template) { $this->_template_dir = $_template_dir; foreach ($_template_dir as $directory) { $directory = realpath($directory); $this->_resource_dir[$directory] = true; } } // rebuild config dir index if ($_config) { $this->_config_dir = $_config_dir; foreach ($_config_dir as $directory) { $directory = realpath($directory); $this->_resource_dir[$directory] = true; } } // rebuild secure dir index if ($_secure) { $this->_secure_dir = $this->secure_dir; foreach ((array) $this->secure_dir as $directory) { $directory = realpath($directory); $this->_resource_dir[$directory] = true; } } $_filepath = realpath($filepath); $directory = dirname($_filepath); $_directory = array(); while (true) { // remember the directory to add it to _resource_dir in case we're successful $_directory[$directory] = true; // test if the directory is trusted if (isset($this->_resource_dir[$directory])) { // merge sub directories of current $directory into _resource_dir to speed up subsequent lookups $this->_resource_dir = array_merge($this->_resource_dir, $_directory); return true; } // abort if we've reached root if (($pos = strrpos($directory, DS)) === false || !isset($directory[1])) { break; } // bubble up one level $directory = substr($directory, 0, $pos); } // give up throw new SmartyException("directory '{$_filepath}' not allowed by security setting"); } /** * 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 SmartyException 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, $_uri)) { return true; } } } throw new SmartyException("URI '{$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) { $directory = realpath($directory); $this->_php_resource_dir[$directory] = true; } } $_filepath = realpath($filepath); $directory = dirname($_filepath); $_directory = array(); while (true) { // remember the directory to add it to _resource_dir in case we're successful $_directory[] = $directory; // test if the directory is trusted if (isset($this->_php_resource_dir[$directory])) { // merge sub directories of current $directory into _resource_dir to speed up subsequent lookups $this->_php_resource_dir = array_merge($this->_php_resource_dir, $_directory); return true; } // abort if we've reached root if (($pos = strrpos($directory, DS)) === false || !isset($directory[2])) { break; } // bubble up one level $directory = substr($directory, 0, $pos); } throw new SmartyException("directory '{$_filepath}' not allowed by security setting"); } }