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refactored bcrypt hashing engine.

This commit is contained in:
Taylor Otwell 2011-10-08 22:41:52 -05:00
parent 92ecae3db9
commit bcb6f189f7
9 changed files with 103 additions and 306 deletions
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2
application/config/aliases.php
View File

@ -31,7 +31,7 @@
'Eloquent' => 'Laravel\\Database\\Eloquent\\Model',
'File' => 'Laravel\\File',
'Form' => 'Laravel\\Form',
'Hasher' => 'Laravel\\Facades\\Hasher',
'Hasher' => 'Laravel\\Security\\Hasher',
'HTML' => 'Laravel\\HTML',
'Inflector' => 'Laravel\\Inflector',
'Input' => 'Laravel\\Input',

10
laravel/bootstrap/core.php
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@ -87,4 +87,12 @@
/**
* Define a few convenient global functions.
*/
require 'functions'.EXT;
function e($value)
{
return HTML::entities($value);
}
function __($key, $replacements = array(), $language = null)
{
return Lang::line($key, $replacements, $language);
}

16
laravel/bootstrap/functions.php
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@ -1,16 +0,0 @@
<?php
function fe($function)
{
return function_exists($function);
}
function e($value)
{
return HTML::entities($value);
}
function __($key, $replacements = array(), $language = null)
{
return Lang::line($key, $replacements, $language);
}

5
laravel/config/container.php
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@ -2,11 +2,6 @@
return array(
'laravel.hasher' => array('singleton' => true, 'resolver' => function($c)
{
return new Security\Hashing\Bcrypt(8, false);
}),
/*
|--------------------------------------------------------------------------
| Laravel Routing Components

4
laravel/container.php
View File

@ -135,13 +135,13 @@ public function instance($name, $instance)
*
* <code>
* // Resolve the "laravel.router" class from the container
* $input = IoC::container()->core('input');
* $input = IoC::container()->core('router');
*
* // Equivalent resolution using the "resolve" method
* $input = IoC::container()->resolve('laravel.router');
*
* // Pass an array of parameters to the resolver
* $input = IoC::container()->core('input', array('test'));
* $input = IoC::container()->core('router', array('test'));
* </code>
*
* @param string $name

64
laravel/security/hasher.php Normal file
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@ -0,0 +1,64 @@
<?php namespace Laravel\Security; use Laravel\Str;
class Hasher {
/**
* Hash a password using the Bcrypt hashing scheme.
*
* Bcrypt provides a future-proof hashing algorithm by allowing the number of "rounds"
* to be increased, thus increasing the time is takes to generate the hashed value.
* The longer is takes to generate the hash, the more impractical a rainbow table
* attack against the hashes becomes.
*
* <code>
* // Create a Bcrypt hash of a value
* $hash = Hasher::hash('secret');
*
* // Use a specified number of iterations when creating the hash
* $hash = Hasher::hash('secret', 12);
* </code>
*
* @param string $value
* @param int $rounds
* @return string
*/
public static function hash($value, $rounds = 8)
{
return crypt($value, '$2a$'.str_pad($rounds, 2, '0', STR_PAD_LEFT).'$'.static::salt());
}
/**
* Determine if an unhashed value matches a given Bcrypt hash.
*
* Since the number of rounds is included in the Bcrypt hash, it is not
* necessary to specify the rounds when calling this method.
*
* @param string $value
* @param string $hash
* @return bool
*/
public static function check($value, $hash)
{
return crypt($value, $hash) === $hash;
}
/**
* Get a salt for use during Bcrypt hashing.
*
* @return string
*/
protected static function salt()
{
// If OpenSSL is installed, we will use it to gather random bytes for generating
// the salt value. Otherwise, we will use the Str::random method. Bcrypt expects
// the salt to be a 22 character alpha-numeric string. The salt may also contain
// dots, plus signs, and forward slashes.
if (function_exists('openssl_random_pseudo_bytes'))
{
return substr(strtr(base64_encode(openssl_random_pseudo_bytes(16)), '+', '.'), 0 , 22);
}
return substr(str_replace('+', '.', base64_encode(Str::random(40))), 0, 22);
}
}

254
laravel/security/hashing/bcrypt.php
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@ -1,254 +0,0 @@
<?php namespace Laravel\Security\Hashing;
//
// Portable PHP password hashing framework.
//
// Version 0.3 / genuine.
//
// Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
// the public domain. Revised in subsequent years, still public domain.
//
// There's absolutely no warranty.
//
// The homepage URL for this framework is:
//
// http://www.openwall.com/phpass/
//
// Please be sure to update the Version line if you edit this file in any way.
// It is suggested that you leave the main version number intact, but indicate
// your project name (after the slash) and add your own revision information.
//
// Please do not change the "private" password hashing method implemented in
// here, thereby making your hashes incompatible. However, if you must, please
// change the hash type identifier (the "$P$") to something different.
//
// Obviously, since this code is in the public domain, the above are not
// requirements (there can be none), but merely suggestions.
//
class Bcrypt implements Engine {
var $itoa64;
var $iteration_count_log2;
var $portable_hashes;
var $random_state;
public function __construct($iteration_count_log2, $portable_hashes)
{
$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)
$iteration_count_log2 = 8;
$this->iteration_count_log2 = $iteration_count_log2;
$this->portable_hashes = $portable_hashes;
$this->random_state = microtime();
if (function_exists('getmypid'))
$this->random_state .= getmypid();
}
protected function get_random_bytes($count)
{
$output = '';
if (is_readable('/dev/urandom') &&
($fh = @fopen('/dev/urandom', 'rb'))) {
$output = fread($fh, $count);
fclose($fh);
}
if (strlen($output) < $count) {
$output = '';
for ($i = 0; $i < $count; $i += 16) {
$this->random_state =
md5(microtime() . $this->random_state);
$output .=
pack('H*', md5($this->random_state));
}
$output = substr($output, 0, $count);
}
return $output;
}
protected function encode64($input, $count)
{
$output = '';
$i = 0;
do {
$value = ord($input[$i++]);
$output .= $this->itoa64[$value & 0x3f];
if ($i < $count)
$value |= ord($input[$i]) << 8;
$output .= $this->itoa64[($value >> 6) & 0x3f];
if ($i++ >= $count)
break;
if ($i < $count)
$value |= ord($input[$i]) << 16;
$output .= $this->itoa64[($value >> 12) & 0x3f];
if ($i++ >= $count)
break;
$output .= $this->itoa64[($value >> 18) & 0x3f];
} while ($i < $count);
return $output;
}
protected function gensalt_private($input)
{
$output = '$P$';
$output .= $this->itoa64[min($this->iteration_count_log2 +
((PHP_VERSION >= '5') ? 5 : 3), 30)];
$output .= $this->encode64($input, 6);
return $output;
}
protected function crypt_private($password, $setting)
{
$output = '*0';
if (substr($setting, 0, 2) == $output)
$output = '*1';
$id = substr($setting, 0, 3);
# We use "$P$", phpBB3 uses "$H$" for the same thing
if ($id != '$P$' && $id != '$H$')
return $output;
$count_log2 = strpos($this->itoa64, $setting[3]);
if ($count_log2 < 7 || $count_log2 > 30)
return $output;
$count = 1 << $count_log2;
$salt = substr($setting, 4, 8);
if (strlen($salt) != 8)
return $output;
// We're kind of forced to use MD5 here since it's the only
// cryptographic primitive available in all versions of PHP
// currently in use. To implement our own low-level crypto
// in PHP would result in much worse performance and
// consequently in lower iteration counts and hashes that are
// quicker to crack (by non-PHP code).
if (PHP_VERSION >= '5') {
$hash = md5($salt . $password, TRUE);
do {
$hash = md5($hash . $password, TRUE);
} while (--$count);
} else {
$hash = pack('H*', md5($salt . $password));
do {
$hash = pack('H*', md5($hash . $password));
} while (--$count);
}
$output = substr($setting, 0, 12);
$output .= $this->encode64($hash, 16);
return $output;
}
protected function gensalt_extended($input)
{
$count_log2 = min($this->iteration_count_log2 + 8, 24);
// This should be odd to not reveal weak DES keys, and the
// maximum valid value is (2**24 - 1) which is odd anyway.
$count = (1 << $count_log2) - 1;
$output = '_';
$output .= $this->itoa64[$count & 0x3f];
$output .= $this->itoa64[($count >> 6) & 0x3f];
$output .= $this->itoa64[($count >> 12) & 0x3f];
$output .= $this->itoa64[($count >> 18) & 0x3f];
$output .= $this->encode64($input, 3);
return $output;
}
protected function gensalt_blowfish($input)
{
// This one needs to use a different order of characters and a
// different encoding scheme from the one in encode64() above.
// We care because the last character in our encoded string will
// only represent 2 bits. While two known implementations of
// bcrypt will happily accept and correct a salt string which
// has the 4 unused bits set to non-zero, we do not want to take
// chances and we also do not want to waste an additional byte
// of entropy.
$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
$output = '$2a$';
$output .= chr(ord('0') + $this->iteration_count_log2 / 10);
$output .= chr(ord('0') + $this->iteration_count_log2 % 10);
$output .= '$';
$i = 0;
do {
$c1 = ord($input[$i++]);
$output .= $itoa64[$c1 >> 2];
$c1 = ($c1 & 0x03) << 4;
if ($i >= 16) {
$output .= $itoa64[$c1];
break;
}
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 4;
$output .= $itoa64[$c1];
$c1 = ($c2 & 0x0f) << 2;
$c2 = ord($input[$i++]);
$c1 |= $c2 >> 6;
$output .= $itoa64[$c1];
$output .= $itoa64[$c2 & 0x3f];
} while (1);
return $output;
}
public function hash($password)
{
$random = '';
if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
$random = $this->get_random_bytes(16);
$hash =
crypt($password, $this->gensalt_blowfish($random));
if (strlen($hash) == 60)
return $hash;
}
if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {
if (strlen($random) < 3)
$random = $this->get_random_bytes(3);
$hash =
crypt($password, $this->gensalt_extended($random));
if (strlen($hash) == 20)
return $hash;
}
if (strlen($random) < 6)
$random = $this->get_random_bytes(6);
$hash =
$this->crypt_private($password,
$this->gensalt_private($random));
if (strlen($hash) == 34)
return $hash;
// Returning '*' on error is safe here, but would _not_ be safe
// in a crypt(3)-like function used _both_ for generating new
// hashes and for validating passwords against existing hashes.
return '*';
}
public function check($password, $stored_hash)
{
$hash = $this->crypt_private($password, $stored_hash);
if ($hash[0] == '*')
$hash = crypt($password, $stored_hash);
return $hash == $stored_hash;
}
}
?>

22
laravel/security/hashing/engine.php
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@ -1,22 +0,0 @@
<?php namespace Laravel\Security\Hashing;
interface Engine {
/**
* Perform a one-way hash on a string.
*
* @param string $value
* @return string
*/
public function hash($value);
/**
* Determine if an unhashed value matches a given hash.
*
* @param string $value
* @param string $hash
* @return bool
*/
public function check($value, $hash);
}

32
laravel/str.php
View File

@ -18,7 +18,12 @@ class Str {
*/
public static function lower($value)
{
return (fe('mb_strtolower')) ? mb_strtolower($value, Config::get('application.encoding')) : strtolower($value);
if (function_exists('mb_strtolower'))
{
return mb_strtolower($value, Config::get('application.encoding'));
}
return strtolower($value);
}
/**
@ -37,7 +42,12 @@ public static function lower($value)
*/
public static function upper($value)
{
return (fe('mb_strtoupper')) ? mb_strtoupper($value, Config::get('application.encoding')) : strtoupper($value);
if (function_exists('mb_strtoupper'))
{
return mb_strtoupper($value, Config::get('application.encoding'));
}
return strtoupper($value);
}
/**
@ -56,7 +66,12 @@ public static function upper($value)
*/
public static function title($value)
{
return (fe('mb_convert_case')) ? mb_convert_case($value, MB_CASE_TITLE, Config::get('application.encoding')) : ucwords(strtolower($value));
if (function_exists('mb_convert_case'))
{
return mb_convert_case($value, MB_CASE_TITLE, Config::get('application.encoding'));
}
return ucwords(strtolower($value));
}
/**
@ -75,7 +90,12 @@ public static function title($value)
*/
public static function length($value)
{
return (fe('mb_strlen')) ? mb_strlen($value, Config::get('application.encoding')) : strlen($value);
if (function_exists('mb_strlen'))
{
return mb_strlen($value, Config::get('application.encoding'));
}
return strlen($value);
}
/**
@ -91,7 +111,9 @@ public static function length($value)
*/
public static function ascii($value)
{
$value = preg_replace(array_keys($foreign = Config::get('ascii')), array_values($foreign), $value);
$foreign = Config::get('ascii');
$value = preg_replace(array_keys($foreign), array_values($foreign), $value);
return preg_replace('/[^\x09\x0A\x0D\x20-\x7E]/', '', $value);
}