227 lines
7.8 KiB
PHP
227 lines
7.8 KiB
PHP
<?php
|
|
/**
|
|
* Random_* Compatibility Library
|
|
* for using the new PHP 7 random_* API in PHP 5 projects
|
|
*
|
|
* @version 2.0.17
|
|
* @released 2018-07-04
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
if (!defined('PHP_VERSION_ID')) {
|
|
// This constant was introduced in PHP 5.2.7
|
|
$RandomCompatversion = array_map('intval', explode('.', PHP_VERSION));
|
|
define(
|
|
'PHP_VERSION_ID',
|
|
$RandomCompatversion[0] * 10000
|
|
+ $RandomCompatversion[1] * 100
|
|
+ $RandomCompatversion[2]
|
|
);
|
|
$RandomCompatversion = null;
|
|
}
|
|
|
|
/**
|
|
* PHP 7.0.0 and newer have these functions natively.
|
|
*/
|
|
if (PHP_VERSION_ID >= 70000) {
|
|
return;
|
|
}
|
|
|
|
if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
|
|
define('RANDOM_COMPAT_READ_BUFFER', 8);
|
|
}
|
|
|
|
$RandomCompatDIR = dirname(__FILE__);
|
|
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'byte_safe_strings.php';
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'cast_to_int.php';
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'error_polyfill.php';
|
|
|
|
if (!is_callable('random_bytes')) {
|
|
/**
|
|
* PHP 5.2.0 - 5.6.x way to implement random_bytes()
|
|
*
|
|
* We use conditional statements here to define the function in accordance
|
|
* to the operating environment. It's a micro-optimization.
|
|
*
|
|
* In order of preference:
|
|
* 1. Use libsodium if available.
|
|
* 2. fread() /dev/urandom if available (never on Windows)
|
|
* 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM)
|
|
* 4. COM('CAPICOM.Utilities.1')->GetRandom()
|
|
*
|
|
* See RATIONALE.md for our reasoning behind this particular order
|
|
*/
|
|
if (extension_loaded('libsodium')) {
|
|
// See random_bytes_libsodium.php
|
|
if (PHP_VERSION_ID >= 50300 && is_callable('\\Sodium\\randombytes_buf')) {
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_libsodium.php';
|
|
} elseif (method_exists('Sodium', 'randombytes_buf')) {
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_libsodium_legacy.php';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reading directly from /dev/urandom:
|
|
*/
|
|
if (DIRECTORY_SEPARATOR === '/') {
|
|
// DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast
|
|
// way to exclude Windows.
|
|
$RandomCompatUrandom = true;
|
|
$RandomCompat_basedir = ini_get('open_basedir');
|
|
|
|
if (!empty($RandomCompat_basedir)) {
|
|
$RandomCompat_open_basedir = explode(
|
|
PATH_SEPARATOR,
|
|
strtolower($RandomCompat_basedir)
|
|
);
|
|
$RandomCompatUrandom = (array() !== array_intersect(
|
|
array('/dev', '/dev/', '/dev/urandom'),
|
|
$RandomCompat_open_basedir
|
|
));
|
|
$RandomCompat_open_basedir = null;
|
|
}
|
|
|
|
if (
|
|
!is_callable('random_bytes')
|
|
&&
|
|
$RandomCompatUrandom
|
|
&&
|
|
@is_readable('/dev/urandom')
|
|
) {
|
|
// Error suppression on is_readable() in case of an open_basedir
|
|
// or safe_mode failure. All we care about is whether or not we
|
|
// can read it at this point. If the PHP environment is going to
|
|
// panic over trying to see if the file can be read in the first
|
|
// place, that is not helpful to us here.
|
|
|
|
// See random_bytes_dev_urandom.php
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_dev_urandom.php';
|
|
}
|
|
// Unset variables after use
|
|
$RandomCompat_basedir = null;
|
|
} else {
|
|
$RandomCompatUrandom = false;
|
|
}
|
|
|
|
/**
|
|
* mcrypt_create_iv()
|
|
*
|
|
* We only want to use mcypt_create_iv() if:
|
|
*
|
|
* - random_bytes() hasn't already been defined
|
|
* - the mcrypt extensions is loaded
|
|
* - One of these two conditions is true:
|
|
* - We're on Windows (DIRECTORY_SEPARATOR !== '/')
|
|
* - We're not on Windows and /dev/urandom is readabale
|
|
* (i.e. we're not in a chroot jail)
|
|
* - Special case:
|
|
* - If we're not on Windows, but the PHP version is between
|
|
* 5.6.10 and 5.6.12, we don't want to use mcrypt. It will
|
|
* hang indefinitely. This is bad.
|
|
* - If we're on Windows, we want to use PHP >= 5.3.7 or else
|
|
* we get insufficient entropy errors.
|
|
*/
|
|
if (
|
|
!is_callable('random_bytes')
|
|
&&
|
|
// Windows on PHP < 5.3.7 is broken, but non-Windows is not known to be.
|
|
(DIRECTORY_SEPARATOR === '/' || PHP_VERSION_ID >= 50307)
|
|
&&
|
|
// Prevent this code from hanging indefinitely on non-Windows;
|
|
// see https://bugs.php.net/bug.php?id=69833
|
|
(
|
|
DIRECTORY_SEPARATOR !== '/' ||
|
|
(PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613)
|
|
)
|
|
&&
|
|
extension_loaded('mcrypt')
|
|
) {
|
|
// See random_bytes_mcrypt.php
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_mcrypt.php';
|
|
}
|
|
$RandomCompatUrandom = null;
|
|
|
|
/**
|
|
* This is a Windows-specific fallback, for when the mcrypt extension
|
|
* isn't loaded.
|
|
*/
|
|
if (
|
|
!is_callable('random_bytes')
|
|
&&
|
|
extension_loaded('com_dotnet')
|
|
&&
|
|
class_exists('COM')
|
|
) {
|
|
$RandomCompat_disabled_classes = preg_split(
|
|
'#\s*,\s*#',
|
|
strtolower(ini_get('disable_classes'))
|
|
);
|
|
|
|
if (!in_array('com', $RandomCompat_disabled_classes)) {
|
|
try {
|
|
$RandomCompatCOMtest = new COM('CAPICOM.Utilities.1');
|
|
/** @psalm-suppress TypeDoesNotContainType */
|
|
if (is_callable(array($RandomCompatCOMtest, 'GetRandom'))) {
|
|
// See random_bytes_com_dotnet.php
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_bytes_com_dotnet.php';
|
|
}
|
|
} catch (com_exception $e) {
|
|
// Don't try to use it.
|
|
}
|
|
}
|
|
$RandomCompat_disabled_classes = null;
|
|
$RandomCompatCOMtest = null;
|
|
}
|
|
|
|
/**
|
|
* throw new Exception
|
|
*/
|
|
if (!is_callable('random_bytes')) {
|
|
/**
|
|
* We don't have any more options, so let's throw an exception right now
|
|
* and hope the developer won't let it fail silently.
|
|
*
|
|
* @param mixed $length
|
|
* @psalm-suppress InvalidReturnType
|
|
* @throws Exception
|
|
* @return string
|
|
*/
|
|
function random_bytes($length)
|
|
{
|
|
unset($length); // Suppress "variable not used" warnings.
|
|
throw new Exception(
|
|
'There is no suitable CSPRNG installed on your system'
|
|
);
|
|
return '';
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!is_callable('random_int')) {
|
|
require_once $RandomCompatDIR.DIRECTORY_SEPARATOR.'random_int.php';
|
|
}
|
|
|
|
$RandomCompatDIR = null;
|