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polyfill-unserialize/src/DisallowedClassesSubstitutor.php 0000604 00000012233 15245755132 0020131 0 ustar 00 <?php namespace Brumann\Polyfill; /** * Worker implementation for identifying and skipping false-positives * not to be substituted - like nested serializations in string literals. * * @internal This class should only be used by \Brumann\Polyfill\Unserialize */ final class DisallowedClassesSubstitutor { const PATTERN_STRING = '#s:(\d+):(")#'; const PATTERN_OBJECT = '#(^|;)O:\d+:"([^"]*)":(\d+):\{#'; /** * @var string */ private $serialized; /** * @var string[] */ private $allowedClasses; /** * Each array item consists of `[<offset-start>, <offset-end>]` and * marks start and end positions of items to be ignored. * * @var array[] */ private $ignoreItems = array(); /** * @param string $serialized * @param string[] $allowedClasses */ public function __construct($serialized, array $allowedClasses) { $this->serialized = $serialized; $this->allowedClasses = $allowedClasses; $this->buildIgnoreItems(); $this->substituteObjects(); } /** * @return string */ public function getSubstitutedSerialized() { return $this->serialized; } /** * Identifies items to be ignored - like nested serializations in string literals. */ private function buildIgnoreItems() { $offset = 0; while (preg_match(self::PATTERN_STRING, $this->serialized, $matches, PREG_OFFSET_CAPTURE, $offset)) { $length = (int)$matches[1][0]; // given length in serialized data (e.g. `s:123:"` --> 123) $start = $matches[2][1]; // offset position of quote character $end = $start + $length + 1; $offset = $end + 1; // serialized string nested in outer serialized string if ($this->ignore($start, $end)) { continue; } $this->ignoreItems[] = array($start, $end); } } /** * Substitutes disallowed object class names and respects items to be ignored. */ private function substituteObjects() { $offset = 0; while (preg_match(self::PATTERN_OBJECT, $this->serialized, $matches, PREG_OFFSET_CAPTURE, $offset)) { $completeMatch = (string)$matches[0][0]; $completeLength = strlen($completeMatch); $start = $matches[0][1]; $end = $start + $completeLength; $leftBorder = (string)$matches[1][0]; $className = (string)$matches[2][0]; $objectSize = (int)$matches[3][0]; $offset = $end + 1; // class name is actually allowed - skip this item if (in_array($className, $this->allowedClasses, true)) { continue; } // serialized object nested in outer serialized string if ($this->ignore($start, $end)) { continue; } $incompleteItem = $this->sanitizeItem($className, $leftBorder, $objectSize); $incompleteItemLength = strlen($incompleteItem); $offset = $start + $incompleteItemLength + 1; $this->replace($incompleteItem, $start, $end); $this->shift($end, $incompleteItemLength - $completeLength); } } /** * Replaces sanitized object class names in serialized data. * * @param string $replacement Sanitized object data * @param int $start Start offset in serialized data * @param int $end End offset in serialized data */ private function replace($replacement, $start, $end) { $this->serialized = substr($this->serialized, 0, $start) . $replacement . substr($this->serialized, $end); } /** * Whether given offset positions should be ignored. * * @param int $start * @param int $end * @return bool */ private function ignore($start, $end) { foreach ($this->ignoreItems as $ignoreItem) { if ($ignoreItem[0] <= $start && $ignoreItem[1] >= $end) { return true; } } return false; } /** * Shifts offset positions of ignore items by `$size`. * This is necessary whenever object class names have been * substituted which have a different length than before. * * @param int $offset * @param int $size */ private function shift($offset, $size) { foreach ($this->ignoreItems as &$ignoreItem) { // only focus on items starting after given offset if ($ignoreItem[0] < $offset) { continue; } $ignoreItem[0] += $size; $ignoreItem[1] += $size; } } /** * Sanitizes object class item. * * @param string $className * @param int $leftBorder * @param int $objectSize * @return string */ private function sanitizeItem($className, $leftBorder, $objectSize) { return sprintf( '%sO:22:"__PHP_Incomplete_Class":%d:{s:27:"__PHP_Incomplete_Class_Name";%s', $leftBorder, $objectSize + 1, // size of object + 1 for added string \serialize($className) ); } } polyfill-unserialize/src/Unserialize.php 0000604 00000002254 15245755132 0014530 0 ustar 00 <?php namespace Brumann\Polyfill; final class Unserialize { /** * @see https://secure.php.net/manual/en/function.unserialize.php * * @param string $serialized Serialized data * @param array $options Associative array containing options * * @return mixed */ public static function unserialize($serialized, array $options = array()) { if (PHP_VERSION_ID >= 70000) { return \unserialize($serialized, $options); } if (!array_key_exists('allowed_classes', $options) || true === $options['allowed_classes']) { return \unserialize($serialized); } $allowedClasses = $options['allowed_classes']; if (false === $allowedClasses) { $allowedClasses = array(); } if (!is_array($allowedClasses)) { $allowedClasses = array(); trigger_error( 'unserialize(): allowed_classes option should be array or boolean', E_USER_WARNING ); } $worker = new DisallowedClassesSubstitutor($serialized, $allowedClasses); return \unserialize($worker->getSubstitutedSerialized()); } } polyfill-unserialize/LICENSE 0000604 00000002063 15245755132 0011741 0 ustar 00 MIT License Copyright (c) 2016-2019 Denis Brumann Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. polyfill-unserialize/composer.json 0000604 00000001144 15245755132 0013455 0 ustar 00 { "name": "brumann/polyfill-unserialize", "description": "Backports unserialize options introduced in PHP 7.0 to older PHP versions.", "type": "library", "license": "MIT", "authors": [ { "name": "Denis Brumann", "email": "denis.brumann@sensiolabs.de" } ], "autoload": { "psr-4": { "Brumann\\Polyfill\\": "src/" } }, "autoload-dev": { "psr-4": { "Tests\\Brumann\\Polyfill\\": "tests/" } }, "minimum-stability": "stable", "require": { "php": "^5.3|^7.0" } }
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