aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorplegall <plg@piwigo.org>2016-04-26 11:07:44 +0200
committerplegall <plg@piwigo.org>2016-04-26 11:07:44 +0200
commitf51ee90c66527fd7ff634f3e8d414cb670da068d (patch)
tree2550f0753f14ed594dbf99cb65675fa02b49fe21
parenta3c46de7511cb5b66f59375d225b1f0fb66ae988 (diff)
bug #470, use a dedicated lib to generate random bytes
-rw-r--r--include/functions_session.inc.php37
-rw-r--r--include/random_compat/byte_safe_strings.php181
-rw-r--r--include/random_compat/cast_to_int.php71
-rw-r--r--include/random_compat/error_polyfill.php42
-rw-r--r--include/random_compat/random.php197
-rw-r--r--include/random_compat/random_bytes_com_dotnet.php81
-rw-r--r--include/random_compat/random_bytes_dev_urandom.php148
-rw-r--r--include/random_compat/random_bytes_libsodium.php86
-rw-r--r--include/random_compat/random_bytes_libsodium_legacy.php86
-rw-r--r--include/random_compat/random_bytes_mcrypt.php76
-rw-r--r--include/random_compat/random_int.php191
11 files changed, 1170 insertions, 26 deletions
diff --git a/include/functions_session.inc.php b/include/functions_session.inc.php
index fe43bc570..0829bcfda 100644
--- a/include/functions_session.inc.php
+++ b/include/functions_session.inc.php
@@ -62,32 +62,17 @@ if (isset($conf['session_save_handler'])
*/
function generate_key($size)
{
- if (
- is_callable('openssl_random_pseudo_bytes')
- and !(version_compare(PHP_VERSION, '5.3.4') < 0 and defined('PHP_WINDOWS_VERSION_MAJOR'))
- )
- {
- return substr(
- str_replace(
- array('+', '/'),
- '',
- base64_encode(openssl_random_pseudo_bytes($size+10))
- ),
- 0,
- $size
- );
- }
- else
- {
- $alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
- $l = strlen($alphabet)-1;
- $key = '';
- for ($i=0; $i<$size; $i++)
- {
- $key.= $alphabet[mt_rand(0, $l)];
- }
- return $key;
- }
+ include_once(PHPWG_ROOT_PATH.'include/random_compat/random.php');
+
+ return substr(
+ str_replace(
+ array('+', '/'),
+ '',
+ base64_encode(random_bytes($size+10))
+ ),
+ 0,
+ $size
+ );
}
/**
diff --git a/include/random_compat/byte_safe_strings.php b/include/random_compat/byte_safe_strings.php
new file mode 100644
index 000000000..dec5d3062
--- /dev/null
+++ b/include/random_compat/byte_safe_strings.php
@@ -0,0 +1,181 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 (!function_exists('RandomCompat_strlen')) {
+ if (
+ defined('MB_OVERLOAD_STRING') &&
+ ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
+ ) {
+ /**
+ * strlen() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version uses mb_strlen() in '8bit' mode to treat strings as raw
+ * binary rather than UTF-8, ISO-8859-1, etc
+ *
+ * @param string $binary_string
+ *
+ * @throws TypeError
+ *
+ * @return int
+ */
+ function RandomCompat_strlen($binary_string)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_strlen() expects a string'
+ );
+ }
+
+ return mb_strlen($binary_string, '8bit');
+ }
+
+ } else {
+ /**
+ * strlen() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version just used the default strlen()
+ *
+ * @param string $binary_string
+ *
+ * @throws TypeError
+ *
+ * @return int
+ */
+ function RandomCompat_strlen($binary_string)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_strlen() expects a string'
+ );
+ }
+ return strlen($binary_string);
+ }
+ }
+}
+
+if (!function_exists('RandomCompat_substr')) {
+
+ if (
+ defined('MB_OVERLOAD_STRING')
+ &&
+ ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING
+ ) {
+ /**
+ * substr() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version uses mb_substr() in '8bit' mode to treat strings as raw
+ * binary rather than UTF-8, ISO-8859-1, etc
+ *
+ * @param string $binary_string
+ * @param int $start
+ * @param int $length (optional)
+ *
+ * @throws TypeError
+ *
+ * @return string
+ */
+ function RandomCompat_substr($binary_string, $start, $length = null)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): First argument should be a string'
+ );
+ }
+
+ if (!is_int($start)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Second argument should be an integer'
+ );
+ }
+
+ if ($length === null) {
+ /**
+ * mb_substr($str, 0, NULL, '8bit') returns an empty string on
+ * PHP 5.3, so we have to find the length ourselves.
+ */
+ $length = RandomCompat_strlen($length) - $start;
+ } elseif (!is_int($length)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Third argument should be an integer, or omitted'
+ );
+ }
+
+ // Consistency with PHP's behavior
+ if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
+ return '';
+ }
+ if ($start > RandomCompat_strlen($binary_string)) {
+ return false;
+ }
+
+ return mb_substr($binary_string, $start, $length, '8bit');
+ }
+
+ } else {
+
+ /**
+ * substr() implementation that isn't brittle to mbstring.func_overload
+ *
+ * This version just uses the default substr()
+ *
+ * @param string $binary_string
+ * @param int $start
+ * @param int $length (optional)
+ *
+ * @throws TypeError
+ *
+ * @return string
+ */
+ function RandomCompat_substr($binary_string, $start, $length = null)
+ {
+ if (!is_string($binary_string)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): First argument should be a string'
+ );
+ }
+
+ if (!is_int($start)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Second argument should be an integer'
+ );
+ }
+
+ if ($length !== null) {
+ if (!is_int($length)) {
+ throw new TypeError(
+ 'RandomCompat_substr(): Third argument should be an integer, or omitted'
+ );
+ }
+
+ return substr($binary_string, $start, $length);
+ }
+
+ return substr($binary_string, $start);
+ }
+ }
+}
diff --git a/include/random_compat/cast_to_int.php b/include/random_compat/cast_to_int.php
new file mode 100644
index 000000000..f441c5d98
--- /dev/null
+++ b/include/random_compat/cast_to_int.php
@@ -0,0 +1,71 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 (!function_exists('RandomCompat_intval')) {
+
+ /**
+ * Cast to an integer if we can, safely.
+ *
+ * If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
+ * (non-inclusive), it will sanely cast it to an int. If you it's equal to
+ * ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
+ * lose precision, so the <= and => operators might accidentally let a float
+ * through.
+ *
+ * @param int|float $number The number we want to convert to an int
+ * @param boolean $fail_open Set to true to not throw an exception
+ *
+ * @return int (or float if $fail_open)
+ *
+ * @throws TypeError
+ */
+ function RandomCompat_intval($number, $fail_open = false)
+ {
+ if (is_numeric($number)) {
+ $number += 0;
+ }
+
+ if (
+ is_float($number)
+ &&
+ $number > ~PHP_INT_MAX
+ &&
+ $number < PHP_INT_MAX
+ ) {
+ $number = (int) $number;
+ }
+
+ if (is_int($number) || $fail_open) {
+ return $number;
+ }
+
+ throw new TypeError(
+ 'Expected an integer.'
+ );
+ }
+}
diff --git a/include/random_compat/error_polyfill.php b/include/random_compat/error_polyfill.php
new file mode 100644
index 000000000..57cfefdcd
--- /dev/null
+++ b/include/random_compat/error_polyfill.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 (!class_exists('Error', false)) {
+ // We can't really avoid making this extend Exception in PHP 5.
+ class Error extends Exception
+ {
+
+ }
+}
+
+if (!class_exists('TypeError', false)) {
+ class TypeError extends Error
+ {
+
+ }
+}
diff --git a/include/random_compat/random.php b/include/random_compat/random.php
new file mode 100644
index 000000000..a8802597d
--- /dev/null
+++ b/include/random_compat/random.php
@@ -0,0 +1,197 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * @version 2.0.2
+ * @released 2016-04-03
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 = explode('.', PHP_VERSION);
+ define(
+ 'PHP_VERSION_ID',
+ $RandomCompatversion[0] * 10000
+ + $RandomCompatversion[1] * 100
+ + $RandomCompatversion[2]
+ );
+ $RandomCompatversion = null;
+}
+
+if (PHP_VERSION_ID < 70000) {
+
+ if (!defined('RANDOM_COMPAT_READ_BUFFER')) {
+ define('RANDOM_COMPAT_READ_BUFFER', 8);
+ }
+
+ $RandomCompatDIR = dirname(__FILE__);
+
+ require_once $RandomCompatDIR.'/byte_safe_strings.php';
+ require_once $RandomCompatDIR.'/cast_to_int.php';
+ require_once $RandomCompatDIR.'/error_polyfill.php';
+
+ if (!function_exists('random_bytes')) {
+ /**
+ * PHP 5.2.0 - 5.6.x way to implement random_bytes()
+ *
+ * We use conditional statements here to define the function in accordance
+ * to the operating environment. It's a micro-optimization.
+ *
+ * In order of preference:
+ * 1. Use libsodium if available.
+ * 2. fread() /dev/urandom if available (never on Windows)
+ * 3. mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM)
+ * 4. COM('CAPICOM.Utilities.1')->GetRandom()
+ * 5. openssl_random_pseudo_bytes() (absolute last resort)
+ *
+ * See ERRATA.md for our reasoning behind this particular order
+ */
+ if (extension_loaded('libsodium')) {
+ // See random_bytes_libsodium.php
+ if (PHP_VERSION_ID >= 50300 && function_exists('\\Sodium\\randombytes_buf')) {
+ require_once $RandomCompatDIR.'/random_bytes_libsodium.php';
+ } elseif (method_exists('Sodium', 'randombytes_buf')) {
+ require_once $RandomCompatDIR.'/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 (
+ !function_exists('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.'/random_bytes_dev_urandom.php';
+ }
+ // Unset variables after use
+ $RandomCompat_basedir = null;
+ } else {
+ $RandomCompatUrandom = false;
+ }
+
+ /**
+ * mcrypt_create_iv()
+ */
+ if (
+ !function_exists('random_bytes')
+ &&
+ PHP_VERSION_ID >= 50307
+ &&
+ extension_loaded('mcrypt')
+ &&
+ (DIRECTORY_SEPARATOR !== '/' || $RandomCompatUrandom)
+ ) {
+ // Prevent this code from hanging indefinitely on non-Windows;
+ // see https://bugs.php.net/bug.php?id=69833
+ if (
+ DIRECTORY_SEPARATOR !== '/' ||
+ (PHP_VERSION_ID <= 50609 || PHP_VERSION_ID >= 50613)
+ ) {
+ // See random_bytes_mcrypt.php
+ require_once $RandomCompatDIR.'/random_bytes_mcrypt.php';
+ }
+ }
+ $RandomCompatUrandom = null;
+
+ if (
+ !function_exists('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 {
+ $RandomCompatCOMtest = new COM('CAPICOM.Utilities.1');
+ if (method_exists($RandomCompatCOMtest, 'GetRandom')) {
+ // See random_bytes_com_dotnet.php
+ require_once $RandomCompatDIR.'/random_bytes_com_dotnet.php';
+ }
+ } catch (com_exception $e) {
+ // Don't try to use it.
+ }
+ }
+ $RandomCompat_disabled_classes = null;
+ $RandomCompatCOMtest = null;
+ }
+
+ /**
+ * throw new Exception
+ */
+ if (!function_exists('random_bytes')) {
+ /**
+ * We don't have any more options, so let's throw an exception right now
+ * and hope the developer won't let it fail silently.
+ */
+ function random_bytes($length)
+ {
+ throw new Exception(
+ 'There is no suitable CSPRNG installed on your system'
+ );
+ }
+ }
+ }
+
+ if (!function_exists('random_int')) {
+ require_once $RandomCompatDIR.'/random_int.php';
+ }
+
+ $RandomCompatDIR = null;
+}
diff --git a/include/random_compat/random_bytes_com_dotnet.php b/include/random_compat/random_bytes_com_dotnet.php
new file mode 100644
index 000000000..342282549
--- /dev/null
+++ b/include/random_compat/random_bytes_com_dotnet.php
@@ -0,0 +1,81 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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.
+ */
+
+/**
+ * Windows with PHP < 5.3.0 will not have the function
+ * openssl_random_pseudo_bytes() available, so let's use
+ * CAPICOM to work around this deficiency.
+ *
+ * @param int $bytes
+ *
+ * @throws Exception
+ *
+ * @return string
+ */
+function random_bytes($bytes)
+{
+ try {
+ $bytes = RandomCompat_intval($bytes);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_bytes(): $bytes must be an integer'
+ );
+ }
+
+ if ($bytes < 1) {
+ throw new Error(
+ 'Length must be greater than 0'
+ );
+ }
+
+ $buf = '';
+ $util = new COM('CAPICOM.Utilities.1');
+ $execCount = 0;
+
+ /**
+ * Let's not let it loop forever. If we run N times and fail to
+ * get N bytes of random data, then CAPICOM has failed us.
+ */
+ do {
+ $buf .= base64_decode($util->GetRandom($bytes, 0));
+ if (RandomCompat_strlen($buf) >= $bytes) {
+ /**
+ * Return our random entropy buffer here:
+ */
+ return RandomCompat_substr($buf, 0, $bytes);
+ }
+ ++$execCount;
+ } while ($execCount < $bytes);
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Could not gather sufficient random data'
+ );
+}
diff --git a/include/random_compat/random_bytes_dev_urandom.php b/include/random_compat/random_bytes_dev_urandom.php
new file mode 100644
index 000000000..db93b0757
--- /dev/null
+++ b/include/random_compat/random_bytes_dev_urandom.php
@@ -0,0 +1,148 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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('RANDOM_COMPAT_READ_BUFFER')) {
+ define('RANDOM_COMPAT_READ_BUFFER', 8);
+}
+
+/**
+ * Unless open_basedir is enabled, use /dev/urandom for
+ * random numbers in accordance with best practices
+ *
+ * Why we use /dev/urandom and not /dev/random
+ * @ref http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers
+ *
+ * @param int $bytes
+ *
+ * @throws Exception
+ *
+ * @return string
+ */
+function random_bytes($bytes)
+{
+ static $fp = null;
+ /**
+ * This block should only be run once
+ */
+ if (empty($fp)) {
+ /**
+ * We use /dev/urandom if it is a char device.
+ * We never fall back to /dev/random
+ */
+ $fp = fopen('/dev/urandom', 'rb');
+ if (!empty($fp)) {
+ $st = fstat($fp);
+ if (($st['mode'] & 0170000) !== 020000) {
+ fclose($fp);
+ $fp = false;
+ }
+ }
+
+ if (!empty($fp)) {
+ /**
+ * stream_set_read_buffer() does not exist in HHVM
+ *
+ * If we don't set the stream's read buffer to 0, PHP will
+ * internally buffer 8192 bytes, which can waste entropy
+ *
+ * stream_set_read_buffer returns 0 on success
+ */
+ if (function_exists('stream_set_read_buffer')) {
+ stream_set_read_buffer($fp, RANDOM_COMPAT_READ_BUFFER);
+ }
+ if (function_exists('stream_set_chunk_size')) {
+ stream_set_chunk_size($fp, RANDOM_COMPAT_READ_BUFFER);
+ }
+ }
+ }
+
+ try {
+ $bytes = RandomCompat_intval($bytes);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_bytes(): $bytes must be an integer'
+ );
+ }
+
+ if ($bytes < 1) {
+ throw new Error(
+ 'Length must be greater than 0'
+ );
+ }
+
+ /**
+ * This if() block only runs if we managed to open a file handle
+ *
+ * It does not belong in an else {} block, because the above
+ * if (empty($fp)) line is logic that should only be run once per
+ * page load.
+ */
+ if (!empty($fp)) {
+ $remaining = $bytes;
+ $buf = '';
+
+ /**
+ * We use fread() in a loop to protect against partial reads
+ */
+ do {
+ $read = fread($fp, $remaining);
+ if ($read === false) {
+ /**
+ * We cannot safely read from the file. Exit the
+ * do-while loop and trigger the exception condition
+ */
+ $buf = false;
+ break;
+ }
+ /**
+ * Decrease the number of bytes returned from remaining
+ */
+ $remaining -= RandomCompat_strlen($read);
+ $buf .= $read;
+ } while ($remaining > 0);
+
+ /**
+ * Is our result valid?
+ */
+ if ($buf !== false) {
+ if (RandomCompat_strlen($buf) === $bytes) {
+ /**
+ * Return our random entropy buffer here:
+ */
+ return $buf;
+ }
+ }
+ }
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Error reading from source device'
+ );
+}
diff --git a/include/random_compat/random_bytes_libsodium.php b/include/random_compat/random_bytes_libsodium.php
new file mode 100644
index 000000000..f802d4e12
--- /dev/null
+++ b/include/random_compat/random_bytes_libsodium.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 the libsodium PHP extension is loaded, we'll use it above any other
+ * solution.
+ *
+ * libsodium-php project:
+ * @ref https://github.com/jedisct1/libsodium-php
+ *
+ * @param int $bytes
+ *
+ * @throws Exception
+ *
+ * @return string
+ */
+function random_bytes($bytes)
+{
+ try {
+ $bytes = RandomCompat_intval($bytes);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_bytes(): $bytes must be an integer'
+ );
+ }
+
+ if ($bytes < 1) {
+ throw new Error(
+ 'Length must be greater than 0'
+ );
+ }
+
+ /**
+ * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
+ * generated in one invocation.
+ */
+ if ($bytes > 2147483647) {
+ $buf = '';
+ for ($i = 0; $i < $bytes; $i += 1073741824) {
+ $n = ($bytes - $i) > 1073741824
+ ? 1073741824
+ : $bytes - $i;
+ $buf .= \Sodium\randombytes_buf($n);
+ }
+ } else {
+ $buf = \Sodium\randombytes_buf($bytes);
+ }
+
+ if ($buf !== false) {
+ if (RandomCompat_strlen($buf) === $bytes) {
+ return $buf;
+ }
+ }
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Could not gather sufficient random data'
+ );
+}
diff --git a/include/random_compat/random_bytes_libsodium_legacy.php b/include/random_compat/random_bytes_libsodium_legacy.php
new file mode 100644
index 000000000..44fddbf6f
--- /dev/null
+++ b/include/random_compat/random_bytes_libsodium_legacy.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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 the libsodium PHP extension is loaded, we'll use it above any other
+ * solution.
+ *
+ * libsodium-php project:
+ * @ref https://github.com/jedisct1/libsodium-php
+ *
+ * @param int $bytes
+ *
+ * @throws Exception
+ *
+ * @return string
+ */
+function random_bytes($bytes)
+{
+ try {
+ $bytes = RandomCompat_intval($bytes);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_bytes(): $bytes must be an integer'
+ );
+ }
+
+ if ($bytes < 1) {
+ throw new Error(
+ 'Length must be greater than 0'
+ );
+ }
+
+ /**
+ * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
+ * generated in one invocation.
+ */
+ if ($bytes > 2147483647) {
+ $buf = '';
+ for ($i = 0; $i < $bytes; $i += 1073741824) {
+ $n = ($bytes - $i) > 1073741824
+ ? 1073741824
+ : $bytes - $i;
+ $buf .= Sodium::randombytes_buf($n);
+ }
+ } else {
+ $buf = Sodium::randombytes_buf($bytes);
+ }
+
+ if ($buf !== false) {
+ if (RandomCompat_strlen($buf) === $bytes) {
+ return $buf;
+ }
+ }
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Could not gather sufficient random data'
+ );
+}
diff --git a/include/random_compat/random_bytes_mcrypt.php b/include/random_compat/random_bytes_mcrypt.php
new file mode 100644
index 000000000..7ac9d9105
--- /dev/null
+++ b/include/random_compat/random_bytes_mcrypt.php
@@ -0,0 +1,76 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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.
+ */
+
+
+/**
+ * Powered by ext/mcrypt (and thankfully NOT libmcrypt)
+ *
+ * @ref https://bugs.php.net/bug.php?id=55169
+ * @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
+ *
+ * @param int $bytes
+ *
+ * @throws Exception
+ *
+ * @return string
+ */
+function random_bytes($bytes)
+{
+ try {
+ $bytes = RandomCompat_intval($bytes);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_bytes(): $bytes must be an integer'
+ );
+ }
+
+ if ($bytes < 1) {
+ throw new Error(
+ 'Length must be greater than 0'
+ );
+ }
+
+ $buf = @mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM);
+ if (
+ $buf !== false
+ &&
+ RandomCompat_strlen($buf) === $bytes
+ ) {
+ /**
+ * Return our random entropy buffer here:
+ */
+ return $buf;
+ }
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Could not gather sufficient random data'
+ );
+}
diff --git a/include/random_compat/random_int.php b/include/random_compat/random_int.php
new file mode 100644
index 000000000..fd3ef87a2
--- /dev/null
+++ b/include/random_compat/random_int.php
@@ -0,0 +1,191 @@
+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 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.
+ */
+
+/**
+ * Fetch a random integer between $min and $max inclusive
+ *
+ * @param int $min
+ * @param int $max
+ *
+ * @throws Exception
+ *
+ * @return int
+ */
+function random_int($min, $max)
+{
+ /**
+ * Type and input logic checks
+ *
+ * If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
+ * (non-inclusive), it will sanely cast it to an int. If you it's equal to
+ * ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
+ * lose precision, so the <= and => operators might accidentally let a float
+ * through.
+ */
+
+ try {
+ $min = RandomCompat_intval($min);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_int(): $min must be an integer'
+ );
+ }
+
+ try {
+ $max = RandomCompat_intval($max);
+ } catch (TypeError $ex) {
+ throw new TypeError(
+ 'random_int(): $max must be an integer'
+ );
+ }
+
+ /**
+ * Now that we've verified our weak typing system has given us an integer,
+ * let's validate the logic then we can move forward with generating random
+ * integers along a given range.
+ */
+ if ($min > $max) {
+ throw new Error(
+ 'Minimum value must be less than or equal to the maximum value'
+ );
+ }
+
+ if ($max === $min) {
+ return $min;
+ }
+
+ /**
+ * Initialize variables to 0
+ *
+ * We want to store:
+ * $bytes => the number of random bytes we need
+ * $mask => an integer bitmask (for use with the &) operator
+ * so we can minimize the number of discards
+ */
+ $attempts = $bits = $bytes = $mask = $valueShift = 0;
+
+ /**
+ * At this point, $range is a positive number greater than 0. It might
+ * overflow, however, if $max - $min > PHP_INT_MAX. PHP will cast it to
+ * a float and we will lose some precision.
+ */
+ $range = $max - $min;
+
+ /**
+ * Test for integer overflow:
+ */
+ if (!is_int($range)) {
+
+ /**
+ * Still safely calculate wider ranges.
+ * Provided by @CodesInChaos, @oittaa
+ *
+ * @ref https://gist.github.com/CodesInChaos/03f9ea0b58e8b2b8d435
+ *
+ * We use ~0 as a mask in this case because it generates all 1s
+ *
+ * @ref https://eval.in/400356 (32-bit)
+ * @ref http://3v4l.org/XX9r5 (64-bit)
+ */
+ $bytes = PHP_INT_SIZE;
+ $mask = ~0;
+
+ } else {
+
+ /**
+ * $bits is effectively ceil(log($range, 2)) without dealing with
+ * type juggling
+ */
+ while ($range > 0) {
+ if ($bits % 8 === 0) {
+ ++$bytes;
+ }
+ ++$bits;
+ $range >>= 1;
+ $mask = $mask << 1 | 1;
+ }
+ $valueShift = $min;
+ }
+
+ /**
+ * Now that we have our parameters set up, let's begin generating
+ * random integers until one falls between $min and $max
+ */
+ do {
+ /**
+ * The rejection probability is at most 0.5, so this corresponds
+ * to a failure probability of 2^-128 for a working RNG
+ */
+ if ($attempts > 128) {
+ throw new Exception(
+ 'random_int: RNG is broken - too many rejections'
+ );
+ }
+
+ /**
+ * Let's grab the necessary number of random bytes
+ */
+ $randomByteString = random_bytes($bytes);
+ if ($randomByteString === false) {
+ throw new Exception(
+ 'Random number generator failure'
+ );
+ }
+
+ /**
+ * Let's turn $randomByteString into an integer
+ *
+ * This uses bitwise operators (<< and |) to build an integer
+ * out of the values extracted from ord()
+ *
+ * Example: [9F] | [6D] | [32] | [0C] =>
+ * 159 + 27904 + 3276800 + 201326592 =>
+ * 204631455
+ */
+ $val = 0;
+ for ($i = 0; $i < $bytes; ++$i) {
+ $val |= ord($randomByteString[$i]) << ($i * 8);
+ }
+
+ /**
+ * Apply mask
+ */
+ $val &= $mask;
+ $val += $valueShift;
+
+ ++$attempts;
+ /**
+ * If $val overflows to a floating point number,
+ * ... or is larger than $max,
+ * ... or smaller than $min,
+ * then try again.
+ */
+ } while (!is_int($val) || $val > $max || $val < $min);
+
+ return (int) $val;
+}