mirror of https://github.com/friendica/friendica
481 lines
16 KiB
PHP
481 lines
16 KiB
PHP
<?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 are immutable
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* the cache is killed every time either of the variables change. That means that two distinct 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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* 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 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(
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'isset', 'empty',
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'count', 'sizeof',
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'in_array', 'is_array',
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'time',
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'nl2br',
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);
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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 $modifiers = null.
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*
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* @var array
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*/
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public $php_modifiers = array(
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'escape',
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'count'
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);
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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 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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* 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 = null;
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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 = null;
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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 = null;
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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 = null;
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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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* @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 $compiler compiler object
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*
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* @return boolean true if function is trusted
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* @throws SmartyCompilerException if php function is not trusted
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*/
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public function isTrustedPhpFunction($function_name, $compiler)
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{
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if (isset($this->php_functions) && (empty($this->php_functions) || in_array($function_name, $this->php_functions))) {
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return true;
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}
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$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 $compiler compiler object
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*
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* @return boolean true if class is trusted
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* @throws SmartyCompilerException if static class is not trusted
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*/
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public function isTrustedStaticClass($class_name, $compiler)
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{
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if (isset($this->static_classes) && (empty($this->static_classes) || in_array($class_name, $this->static_classes))) {
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return true;
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}
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$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 PHP modifier is trusted.
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*
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* @param string $modifier_name
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* @param object $compiler compiler object
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*
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* @return boolean true if modifier is trusted
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* @throws SmartyCompilerException if modifier is not trusted
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*/
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public function isTrustedPhpModifier($modifier_name, $compiler)
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{
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if (isset($this->php_modifiers) && (empty($this->php_modifiers) || in_array($modifier_name, $this->php_modifiers))) {
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return true;
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}
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$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 $compiler compiler object
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*
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* @return boolean true if tag is trusted
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* @throws SmartyCompilerException if modifier is not trusted
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*/
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public function isTrustedTag($tag_name, $compiler)
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{
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// check for internal always required tags
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if (in_array($tag_name, array('assign', 'call', 'private_filter', 'private_block_plugin', 'private_function_plugin', 'private_object_block_function',
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'private_object_function', 'private_registered_function', 'private_registered_block', 'private_special_variable', 'private_print_expression', 'private_modifier'))
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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", $compiler->lex->taglineno);
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}
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} elseif (in_array($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", $compiler->lex->taglineno);
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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 $compiler compiler object
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*
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* @return boolean true if tag is trusted
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* @throws SmartyCompilerException if modifier is not trusted
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*/
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public function isTrustedModifier($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("modifier '{$modifier_name}' disabled by security setting", $compiler->lex->taglineno);
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}
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} elseif (in_array($modifier_name, $this->allowed_modifiers) && !in_array($modifier_name, $this->disabled_modifiers)) {
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return true;
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} else {
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$compiler->trigger_template_error("modifier '{$modifier_name}' not allowed by security setting", $compiler->lex->taglineno);
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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 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 $filepath
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*
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* @return boolean true if directory is trusted
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* @throws SmartyException if directory is not trusted
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*/
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public function isTrustedResourceDir($filepath)
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{
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$_template = false;
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$_config = false;
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$_secure = false;
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$_template_dir = $this->smarty->getTemplateDir();
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$_config_dir = $this->smarty->getConfigDir();
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// check if index is outdated
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if ((!$this->_template_dir || $this->_template_dir !== $_template_dir)
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|| (!$this->_config_dir || $this->_config_dir !== $_config_dir)
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|| (!empty($this->secure_dir) && (!$this->_secure_dir || $this->_secure_dir !== $this->secure_dir))
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) {
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$this->_resource_dir = array();
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$_template = true;
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$_config = true;
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$_secure = !empty($this->secure_dir);
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}
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// rebuild template dir index
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if ($_template) {
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$this->_template_dir = $_template_dir;
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foreach ($_template_dir as $directory) {
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$directory = realpath($directory);
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$this->_resource_dir[$directory] = true;
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}
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}
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// rebuild config dir index
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if ($_config) {
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$this->_config_dir = $_config_dir;
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foreach ($_config_dir as $directory) {
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$directory = realpath($directory);
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$this->_resource_dir[$directory] = true;
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}
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}
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// rebuild secure dir index
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if ($_secure) {
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$this->_secure_dir = $this->secure_dir;
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foreach ((array) $this->secure_dir as $directory) {
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$directory = realpath($directory);
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$this->_resource_dir[$directory] = true;
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}
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}
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$_filepath = realpath($filepath);
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$directory = dirname($_filepath);
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$_directory = array();
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while (true) {
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// remember the directory to add it to _resource_dir in case we're successful
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$_directory[$directory] = true;
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// test if the directory is trusted
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if (isset($this->_resource_dir[$directory])) {
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// merge sub directories of current $directory into _resource_dir to speed up subsequent lookup
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$this->_resource_dir = array_merge($this->_resource_dir, $_directory);
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return true;
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}
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// abort if we've reached root
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if (($pos = strrpos($directory, DS)) === false || !isset($directory[1])) {
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break;
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}
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// bubble up one level
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$directory = substr($directory, 0, $pos);
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}
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// give up
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throw new SmartyException("directory '{$_filepath}' not allowed by security setting");
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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'])) {
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$_uri = $_uri['scheme'] . '://' . $_uri['host'];
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foreach ($this->trusted_uri as $pattern) {
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if (preg_match($pattern, $_uri)) {
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return true;
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}
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}
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}
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throw new SmartyException("URI '{$uri}' 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 $filepath
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*
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* @return boolean true if directory is trusted
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* @throws SmartyException if PHP directory is not trusted
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*/
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public function isTrustedPHPDir($filepath)
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{
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if (empty($this->trusted_dir)) {
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throw new SmartyException("directory '{$filepath}' not allowed by security setting (no trusted_dir specified)");
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}
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// check if index is outdated
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if (!$this->_trusted_dir || $this->_trusted_dir !== $this->trusted_dir) {
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$this->_php_resource_dir = array();
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$this->_trusted_dir = $this->trusted_dir;
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foreach ((array) $this->trusted_dir as $directory) {
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$directory = realpath($directory);
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$this->_php_resource_dir[$directory] = true;
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}
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}
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$_filepath = realpath($filepath);
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$directory = dirname($_filepath);
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$_directory = array();
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while (true) {
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// remember the directory to add it to _resource_dir in case we're successful
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$_directory[] = $directory;
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// test if the directory is trusted
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if (isset($this->_php_resource_dir[$directory])) {
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// merge sub directories of current $directory into _resource_dir to speed up subsequent lookup
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$this->_php_resource_dir = array_merge($this->_php_resource_dir, $_directory);
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return true;
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}
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// abort if we've reached root
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if (($pos = strrpos($directory, DS)) === false || !isset($directory[2])) {
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break;
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}
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// bubble up one level
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$directory = substr($directory, 0, $pos);
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}
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throw new SmartyException("directory '{$_filepath}' not allowed by security setting");
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}
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}
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