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223 lines
7.5 KiB
223 lines
7.5 KiB
<?php |
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/** |
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* Random_* Compatibility Library |
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* for using the new PHP 7 random_* API in PHP 5 projects |
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* |
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* @version 2.0.10 |
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* @released 2017-03-13 |
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* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2015 - 2017 Paragon Initiative Enterprises |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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if (!defined('PHP_VERSION_ID')) { |
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// This constant was introduced in PHP 5.2.7 |
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$RandomCompatversion = array_map('intval', explode('.', PHP_VERSION)); |
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define( |
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'PHP_VERSION_ID', |
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$RandomCompatversion[0] * 10000 |
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+ $RandomCompatversion[1] * 100 |
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+ $RandomCompatversion[2] |
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); |
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$RandomCompatversion = null; |
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} |
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/** |
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* PHP 7.0.0 and newer have these functions natively. |
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*/ |
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if (PHP_VERSION_ID >= 70000) { |
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return; |
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} |
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if (!defined('RANDOM_COMPAT_READ_BUFFER')) { |
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define('RANDOM_COMPAT_READ_BUFFER', 8); |
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} |
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$RandomCompatDIR = dirname(__FILE__); |
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require_once $RandomCompatDIR . '/byte_safe_strings.php'; |
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require_once $RandomCompatDIR . '/cast_to_int.php'; |
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require_once $RandomCompatDIR . '/error_polyfill.php'; |
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if (!is_callable('random_bytes')) { |
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/** |
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* PHP 5.2.0 - 5.6.x way to implement random_bytes() |
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* |
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* We use conditional statements here to define the function in accordance |
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* to the operating environment. It's a micro-optimization. |
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* |
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* In order of preference: |
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* 1. Use libsodium if available. |
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* 2. fread() /dev/urandom if available (never on Windows) |
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* 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM) |
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* 4. COM('CAPICOM.Utilities.1')->GetRandom() |
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* |
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* See RATIONALE.md for our reasoning behind this particular order |
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*/ |
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if (extension_loaded('libsodium')) { |
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// See random_bytes_libsodium.php |
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if (PHP_VERSION_ID >= 50300 && is_callable('\\Sodium\\randombytes_buf')) { |
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require_once $RandomCompatDIR . '/random_bytes_libsodium.php'; |
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} elseif (method_exists('Sodium', 'randombytes_buf')) { |
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require_once $RandomCompatDIR . '/random_bytes_libsodium_legacy.php'; |
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} |
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} |
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/** |
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* Reading directly from /dev/urandom: |
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*/ |
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if (DIRECTORY_SEPARATOR === '/') { |
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// DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast |
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// way to exclude Windows. |
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$RandomCompatUrandom = true; |
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$RandomCompat_basedir = ini_get('open_basedir'); |
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if (!empty($RandomCompat_basedir)) { |
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$RandomCompat_open_basedir = explode( |
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PATH_SEPARATOR, |
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strtolower($RandomCompat_basedir) |
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); |
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$RandomCompatUrandom = (array() !== array_intersect( |
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array('/dev', '/dev/', '/dev/urandom'), |
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$RandomCompat_open_basedir |
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)); |
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$RandomCompat_open_basedir = null; |
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} |
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if ( |
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!is_callable('random_bytes') |
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&& |
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$RandomCompatUrandom |
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&& |
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@is_readable('/dev/urandom') |
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) { |
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// Error suppression on is_readable() in case of an open_basedir |
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// or safe_mode failure. All we care about is whether or not we |
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// can read it at this point. If the PHP environment is going to |
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// panic over trying to see if the file can be read in the first |
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// place, that is not helpful to us here. |
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// See random_bytes_dev_urandom.php |
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require_once $RandomCompatDIR . '/random_bytes_dev_urandom.php'; |
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} |
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// Unset variables after use |
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$RandomCompat_basedir = null; |
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} else { |
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$RandomCompatUrandom = false; |
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} |
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/** |
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* mcrypt_create_iv() |
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* |
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* We only want to use mcypt_create_iv() if: |
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* |
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* - random_bytes() hasn't already been defined |
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* - the mcrypt extensions is loaded |
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* - One of these two conditions is true: |
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* - We're on Windows (DIRECTORY_SEPARATOR !== '/') |
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* - We're not on Windows and /dev/urandom is readabale |
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* (i.e. we're not in a chroot jail) |
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* - Special case: |
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* - If we're not on Windows, but the PHP version is between |
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* 5.6.10 and 5.6.12, we don't want to use mcrypt. It will |
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* hang indefinitely. This is bad. |
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* - If we're on Windows, we want to use PHP >= 5.3.7 or else |
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* we get insufficient entropy errors. |
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*/ |
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if ( |
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!is_callable('random_bytes') |
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&& |
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// Windows on PHP < 5.3.7 is broken, but non-Windows is not known to be. |
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(DIRECTORY_SEPARATOR === '/' || PHP_VERSION_ID >= 50307) |
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&& |
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// Prevent this code from hanging indefinitely on non-Windows; |
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// see https://bugs.php.net/bug.php?id=69833 |
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( |
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DIRECTORY_SEPARATOR !== '/' || |
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(PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613) |
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) |
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&& |
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extension_loaded('mcrypt') |
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) { |
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// See random_bytes_mcrypt.php |
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require_once $RandomCompatDIR . '/random_bytes_mcrypt.php'; |
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} |
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$RandomCompatUrandom = null; |
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/** |
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* This is a Windows-specific fallback, for when the mcrypt extension |
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* isn't loaded. |
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*/ |
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if ( |
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!is_callable('random_bytes') |
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&& |
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extension_loaded('com_dotnet') |
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&& |
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class_exists('COM') |
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) { |
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$RandomCompat_disabled_classes = preg_split( |
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'#\s*,\s*#', |
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strtolower(ini_get('disable_classes')) |
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); |
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if (!in_array('com', $RandomCompat_disabled_classes)) { |
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try { |
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$RandomCompatCOMtest = new COM('CAPICOM.Utilities.1'); |
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if (method_exists($RandomCompatCOMtest, 'GetRandom')) { |
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// See random_bytes_com_dotnet.php |
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require_once $RandomCompatDIR . '/random_bytes_com_dotnet.php'; |
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} |
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} catch (com_exception $e) { |
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// Don't try to use it. |
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} |
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} |
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$RandomCompat_disabled_classes = null; |
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$RandomCompatCOMtest = null; |
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} |
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/** |
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* throw new Exception |
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*/ |
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if (!is_callable('random_bytes')) { |
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/** |
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* We don't have any more options, so let's throw an exception right now |
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* and hope the developer won't let it fail silently. |
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* |
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* @param mixed $length |
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* @return void |
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* @throws Exception |
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*/ |
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function random_bytes($length) |
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{ |
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unset($length); // Suppress "variable not used" warnings. |
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throw new Exception( |
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'There is no suitable CSPRNG installed on your system' |
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); |
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} |
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} |
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} |
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if (!is_callable('random_int')) { |
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require_once $RandomCompatDIR . '/random_int.php'; |
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} |
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$RandomCompatDIR = null;
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