WordPress 4.5
[autoinstalls/wordpress.git] / wp-includes / random_compat / random.php
index d1f7555afaf8d00e4b01b8a3d45b48204e155e25..595115e5d934f8921252a549249651f14281b47b 100644 (file)
@@ -1,22 +1,25 @@
 <?php
 /**
- * Random_* Compatibility Library 
+ * Random_* Compatibility Library
  * for using the new PHP 7 random_* API in PHP 5 projects
- * 
+ *
+ * @version 1.2.1
+ * @released 2016-02-29
+ *
  * 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
 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]));
+    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_CREATE_IV)
+         *   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
-            require_once $RandomCompatDIR.'/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';
+            }
         }
-        if (
-            !function_exists('random_bytes') && 
-            DIRECTORY_SEPARATOR === '/' &&
-            @is_readable('/dev/urandom')
-        ) {
+
+        /**
+         * Reading directly from /dev/urandom:
+         */
+        if (DIRECTORY_SEPARATOR === '/') {
             // DIRECTORY_SEPARATOR === '/' on Unix-like OSes -- this is a fast
             // way to exclude Windows.
-            // 
-            // 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';
+            $RandomCompatUrandom = true;
+            $RandomCompat_basedir = ini_get('open_basedir');
+
+            if (!empty($RandomCompat_basedir)) {
+                $RandomCompat_open_basedir = explode(
+                    PATH_SEPARATOR,
+                    strtolower($RandomCompat_basedir)
+                );
+                $RandomCompatUrandom = in_array(
+                    '/dev',
+                    $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;
+            $RandomCompatUrandom = null;
         }
+
+        /**
+         * mcrypt_create_iv()
+         */
         if (
-            !function_exists('random_bytes') &&
-            PHP_VERSION_ID >= 50307 &&
+            !function_exists('random_bytes')
+            &&
+            PHP_VERSION_ID >= 50307
+            &&
             extension_loaded('mcrypt')
         ) {
-            // See random_bytes_mcrypt.php
-            require_once $RandomCompatDIR.'/random_bytes_mcrypt.php';
+            // 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';
+            }
         }
+
         if (
-            !function_exists('random_bytes') && 
-            extension_loaded('com_dotnet') &&
+            !function_exists('random_bytes')
+            &&
+            extension_loaded('com_dotnet')
+            &&
             class_exists('COM')
         ) {
-            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';
+            $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.
                 }
-            } catch (com_exception $e) {
-                // Don't try to use it.
             }
+            $RandomCompat_disabled_classes = null;
             $RandomCompatCOMtest = null;
         }
+
+        /**
+         * openssl_random_pseudo_bytes()
+         */
         if (
-            !function_exists('random_bytes') && 
-            extension_loaded('openssl') &&
             (
                 // Unix-like with PHP >= 5.3.0 or
                 (
-                    DIRECTORY_SEPARATOR === '/' &&
+                    DIRECTORY_SEPARATOR === '/'
+                    &&
                     PHP_VERSION_ID >= 50300
-                ) ||
+                )
+                ||
                 // Windows with PHP >= 5.4.1
                 PHP_VERSION_ID >= 50401
             )
+            &&
+            !function_exists('random_bytes')
+            &&
+            extension_loaded('openssl')
         ) {
             // See random_bytes_openssl.php
             require_once $RandomCompatDIR.'/random_bytes_openssl.php';
         }
+
+        /**
+         * throw new Exception
+         */
         if (!function_exists('random_bytes')) {
             /**
              * We don't have any more options, so let's throw an exception right now
              * and hope the developer won't let it fail silently.
              */
-            function random_bytes()
+            function random_bytes($length)
             {
                 throw new Exception(
                     'There is no suitable CSPRNG installed on your system'
@@ -130,8 +208,10 @@ if (PHP_VERSION_ID < 70000) {
             }
         }
     }
+
     if (!function_exists('random_int')) {
         require_once $RandomCompatDIR.'/random_int.php';
     }
+
     $RandomCompatDIR = null;
 }