280 lines
10 KiB
PHP
280 lines
10 KiB
PHP
|
<?php
|
||
|
|
/**
|
||
|
|
* A Compatibility library with PHP 5.5's simplified password hashing API.
|
||
|
|
*
|
||
|
|
* @author Anthony Ferrara <ircmaxell@php.net>
|
||
|
|
* @license http://www.opensource.org/licenses/mit-license.html MIT License
|
||
|
|
* @copyright 2012 The Authors
|
||
|
|
*/
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
if (!defined('PASSWORD_DEFAULT')) {
|
||
|
|
|
||
|
|
define('PASSWORD_BCRYPT', 1);
|
||
|
|
define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Hash the password using the specified algorithm
|
||
|
|
*
|
||
|
|
* @param string $password The password to hash
|
||
|
|
* @param int $algo The algorithm to use (Defined by PASSWORD_* constants)
|
||
|
|
* @param array $options The options for the algorithm to use
|
||
|
|
*
|
||
|
|
* @return string|false The hashed password, or false on error.
|
||
|
|
*/
|
||
|
|
function password_hash($password, $algo, array $options = array()) {
|
||
|
|
if (!function_exists('crypt')) {
|
||
|
|
trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
if (!is_string($password)) {
|
||
|
|
trigger_error("password_hash(): Password must be a string", E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
if (!is_int($algo)) {
|
||
|
|
trigger_error("password_hash() expects parameter 2 to be long, " . gettype($algo) . " given", E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
$resultLength = 0;
|
||
|
|
switch ($algo) {
|
||
|
|
case PASSWORD_BCRYPT:
|
||
|
|
// Note that this is a C constant, but not exposed to PHP, so we don't define it here.
|
||
|
|
$cost = 10;
|
||
|
|
if (isset($options['cost'])) {
|
||
|
|
$cost = $options['cost'];
|
||
|
|
if ($cost < 4 || $cost > 31) {
|
||
|
|
trigger_error(sprintf("password_hash(): Invalid bcrypt cost parameter specified: %d", $cost), E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// The length of salt to generate
|
||
|
|
$raw_salt_len = 16;
|
||
|
|
// The length required in the final serialization
|
||
|
|
$required_salt_len = 22;
|
||
|
|
$hash_format = sprintf("$2y$%02d$", $cost);
|
||
|
|
// The expected length of the final crypt() output
|
||
|
|
$resultLength = 60;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
trigger_error(sprintf("password_hash(): Unknown password hashing algorithm: %s", $algo), E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
$salt_requires_encoding = false;
|
||
|
|
if (isset($options['salt'])) {
|
||
|
|
switch (gettype($options['salt'])) {
|
||
|
|
case 'NULL':
|
||
|
|
case 'boolean':
|
||
|
|
case 'integer':
|
||
|
|
case 'double':
|
||
|
|
case 'string':
|
||
|
|
$salt = (string) $options['salt'];
|
||
|
|
break;
|
||
|
|
case 'object':
|
||
|
|
if (method_exists($options['salt'], '__tostring')) {
|
||
|
|
$salt = (string) $options['salt'];
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case 'array':
|
||
|
|
case 'resource':
|
||
|
|
default:
|
||
|
|
trigger_error('password_hash(): Non-string salt parameter supplied', E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
if (PasswordCompat\binary\_strlen($salt) < $required_salt_len) {
|
||
|
|
trigger_error(sprintf("password_hash(): Provided salt is too short: %d expecting %d", PasswordCompat\binary\_strlen($salt), $required_salt_len), E_USER_WARNING);
|
||
|
|
return null;
|
||
|
|
} elseif (0 == preg_match('#^[a-zA-Z0-9./]+$#D', $salt)) {
|
||
|
|
$salt_requires_encoding = true;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
$buffer = '';
|
||
|
|
$buffer_valid = false;
|
||
|
|
if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) {
|
||
|
|
$buffer = mcrypt_create_iv($raw_salt_len, MCRYPT_DEV_URANDOM);
|
||
|
|
if ($buffer) {
|
||
|
|
$buffer_valid = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) {
|
||
|
|
$buffer = openssl_random_pseudo_bytes($raw_salt_len);
|
||
|
|
if ($buffer) {
|
||
|
|
$buffer_valid = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$buffer_valid && @is_readable('/dev/urandom')) {
|
||
|
|
$f = fopen('/dev/urandom', 'r');
|
||
|
|
$read = PasswordCompat\binary\_strlen($buffer);
|
||
|
|
while ($read < $raw_salt_len) {
|
||
|
|
$buffer .= fread($f, $raw_salt_len - $read);
|
||
|
|
$read = PasswordCompat\binary\_strlen($buffer);
|
||
|
|
}
|
||
|
|
fclose($f);
|
||
|
|
if ($read >= $raw_salt_len) {
|
||
|
|
$buffer_valid = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!$buffer_valid || PasswordCompat\binary\_strlen($buffer) < $raw_salt_len) {
|
||
|
|
$bl = PasswordCompat\binary\_strlen($buffer);
|
||
|
|
for ($i = 0; $i < $raw_salt_len; $i++) {
|
||
|
|
if ($i < $bl) {
|
||
|
|
$buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255));
|
||
|
|
} else {
|
||
|
|
$buffer .= chr(mt_rand(0, 255));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$salt = $buffer;
|
||
|
|
$salt_requires_encoding = true;
|
||
|
|
}
|
||
|
|
if ($salt_requires_encoding) {
|
||
|
|
// encode string with the Base64 variant used by crypt
|
||
|
|
$base64_digits =
|
||
|
|
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
|
||
|
|
$bcrypt64_digits =
|
||
|
|
'./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
|
||
|
|
|
||
|
|
$base64_string = base64_encode($salt);
|
||
|
|
$salt = strtr(rtrim($base64_string, '='), $base64_digits, $bcrypt64_digits);
|
||
|
|
}
|
||
|
|
$salt = PasswordCompat\binary\_substr($salt, 0, $required_salt_len);
|
||
|
|
|
||
|
|
$hash = $hash_format . $salt;
|
||
|
|
|
||
|
|
$ret = crypt($password, $hash);
|
||
|
|
|
||
|
|
if (!is_string($ret) || PasswordCompat\binary\_strlen($ret) != $resultLength) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return $ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get information about the password hash. Returns an array of the information
|
||
|
|
* that was used to generate the password hash.
|
||
|
|
*
|
||
|
|
* array(
|
||
|
|
* 'algo' => 1,
|
||
|
|
* 'algoName' => 'bcrypt',
|
||
|
|
* 'options' => array(
|
||
|
|
* 'cost' => 10,
|
||
|
|
* ),
|
||
|
|
* )
|
||
|
|
*
|
||
|
|
* @param string $hash The password hash to extract info from
|
||
|
|
*
|
||
|
|
* @return array The array of information about the hash.
|
||
|
|
*/
|
||
|
|
function password_get_info($hash) {
|
||
|
|
$return = array(
|
||
|
|
'algo' => 0,
|
||
|
|
'algoName' => 'unknown',
|
||
|
|
'options' => array(),
|
||
|
|
);
|
||
|
|
if (PasswordCompat\binary\_substr($hash, 0, 4) == '$2y$' && PasswordCompat\binary\_strlen($hash) == 60) {
|
||
|
|
$return['algo'] = PASSWORD_BCRYPT;
|
||
|
|
$return['algoName'] = 'bcrypt';
|
||
|
|
list($cost) = sscanf($hash, "$2y$%d$");
|
||
|
|
$return['options']['cost'] = $cost;
|
||
|
|
}
|
||
|
|
return $return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determine if the password hash needs to be rehashed according to the options provided
|
||
|
|
*
|
||
|
|
* If the answer is true, after validating the password using password_verify, rehash it.
|
||
|
|
*
|
||
|
|
* @param string $hash The hash to test
|
||
|
|
* @param int $algo The algorithm used for new password hashes
|
||
|
|
* @param array $options The options array passed to password_hash
|
||
|
|
*
|
||
|
|
* @return boolean True if the password needs to be rehashed.
|
||
|
|
*/
|
||
|
|
function password_needs_rehash($hash, $algo, array $options = array()) {
|
||
|
|
$info = password_get_info($hash);
|
||
|
|
if ($info['algo'] != $algo) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
switch ($algo) {
|
||
|
|
case PASSWORD_BCRYPT:
|
||
|
|
$cost = isset($options['cost']) ? $options['cost'] : 10;
|
||
|
|
if ($cost != $info['options']['cost']) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Verify a password against a hash using a timing attack resistant approach
|
||
|
|
*
|
||
|
|
* @param string $password The password to verify
|
||
|
|
* @param string $hash The hash to verify against
|
||
|
|
*
|
||
|
|
* @return boolean If the password matches the hash
|
||
|
|
*/
|
||
|
|
function password_verify($password, $hash) {
|
||
|
|
if (!function_exists('crypt')) {
|
||
|
|
trigger_error("Crypt must be loaded for password_verify to function", E_USER_WARNING);
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
$ret = crypt($password, $hash);
|
||
|
|
if (!is_string($ret) || PasswordCompat\binary\_strlen($ret) != PasswordCompat\binary\_strlen($hash) || PasswordCompat\binary\_strlen($ret) <= 13) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
$status = 0;
|
||
|
|
for ($i = 0; $i < PasswordCompat\binary\_strlen($ret); $i++) {
|
||
|
|
$status |= (ord($ret[$i]) ^ ord($hash[$i]));
|
||
|
|
}
|
||
|
|
|
||
|
|
return $status === 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
namespace PasswordCompat\binary {
|
||
|
|
/**
|
||
|
|
* Count the number of bytes in a string
|
||
|
|
*
|
||
|
|
* We cannot simply use strlen() for this, because it might be overwritten by the mbstring extension.
|
||
|
|
* In this case, strlen() will count the number of *characters* based on the internal encoding. A
|
||
|
|
* sequence of bytes might be regarded as a single multibyte character.
|
||
|
|
*
|
||
|
|
* @param string $binary_string The input string
|
||
|
|
*
|
||
|
|
* @internal
|
||
|
|
* @return int The number of bytes
|
||
|
|
*/
|
||
|
|
function _strlen($binary_string) {
|
||
|
|
if (function_exists('mb_strlen')) {
|
||
|
|
return mb_strlen($binary_string, '8bit');
|
||
|
|
}
|
||
|
|
return strlen($binary_string);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get a substring based on byte limits
|
||
|
|
*
|
||
|
|
* @see _strlen()
|
||
|
|
*
|
||
|
|
* @param string $binary_string The input string
|
||
|
|
* @param int $start
|
||
|
|
* @param int $length
|
||
|
|
*
|
||
|
|
* @internal
|
||
|
|
* @return string The substring
|
||
|
|
*/
|
||
|
|
function _substr($binary_string, $start, $length) {
|
||
|
|
if (function_exists('mb_substr')) {
|
||
|
|
return mb_substr($binary_string, $start, $length, '8bit');
|
||
|
|
}
|
||
|
|
return substr($binary_string, $start, $length);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|