Klimov Paul
10 years ago
3 changed files with 0 additions and 443 deletions
@ -1,368 +0,0 @@
|
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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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|
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namespace yii\helpers; |
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|
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use Yii; |
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use yii\base\Exception; |
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use yii\base\InvalidConfigException; |
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use yii\base\InvalidParamException; |
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|
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/** |
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* BaseSecurity provides concrete implementation for [[Security]]. |
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* |
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* Do not use BaseSecurity. Use [[Security]] instead. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @author Tom Worster <fsb@thefsb.org> |
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* @since 2.0 |
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*/ |
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class BaseSecurity |
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{ |
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/** |
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* Uses AES, block size is 128-bit (16 bytes). |
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*/ |
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const CRYPT_BLOCK_SIZE = 16; |
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/** |
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* Uses AES-192, key size is 192-bit (24 bytes). |
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*/ |
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const CRYPT_KEY_SIZE = 24; |
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|
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/** |
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* Uses SHA-256. |
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*/ |
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const DERIVATION_HASH = 'sha256'; |
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|
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/** |
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* Uses 1000 iterations. |
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*/ |
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const DERIVATION_ITERATIONS = 1000; |
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/** |
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* Encrypts data. |
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* @param string $data data to be encrypted. |
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* @param string $password the encryption password |
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* @return string the encrypted data |
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* @throws Exception if PHP Mcrypt extension is not loaded or failed to be initialized |
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* @see decrypt() |
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*/ |
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public static function encrypt($data, $password) |
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{ |
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$module = static::openCryptModule(); |
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$data = static::addPadding($data); |
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$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($module), MCRYPT_RAND); |
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$key = static::deriveKey($password, $iv); |
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mcrypt_generic_init($module, $key, $iv); |
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$encrypted = $iv . mcrypt_generic($module, $data); |
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mcrypt_generic_deinit($module); |
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mcrypt_module_close($module); |
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return $encrypted; |
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} |
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/** |
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* Decrypts data |
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* @param string $data data to be decrypted. |
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* @param string $password the decryption password |
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* @return string the decrypted data |
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* @throws Exception if PHP Mcrypt extension is not loaded or failed to be initialized |
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* @see encrypt() |
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*/ |
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public static function decrypt($data, $password) |
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{ |
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if ($data === null) { |
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return null; |
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} |
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$module = static::openCryptModule(); |
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$ivSize = mcrypt_enc_get_iv_size($module); |
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$iv = StringHelper::byteSubstr($data, 0, $ivSize); |
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$key = static::deriveKey($password, $iv); |
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mcrypt_generic_init($module, $key, $iv); |
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$decrypted = mdecrypt_generic($module, StringHelper::byteSubstr($data, $ivSize, StringHelper::byteLength($data))); |
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mcrypt_generic_deinit($module); |
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mcrypt_module_close($module); |
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return static::stripPadding($decrypted); |
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} |
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/** |
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* Adds a padding to the given data (PKCS #7). |
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* @param string $data the data to pad |
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* @return string the padded data |
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*/ |
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protected static function addPadding($data) |
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{ |
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$pad = self::CRYPT_BLOCK_SIZE - (StringHelper::byteLength($data) % self::CRYPT_BLOCK_SIZE); |
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return $data . str_repeat(chr($pad), $pad); |
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} |
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/** |
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* Strips the padding from the given data. |
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* @param string $data the data to trim |
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* @return string the trimmed data |
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*/ |
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protected static function stripPadding($data) |
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{ |
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$end = StringHelper::byteSubstr($data, -1, null); |
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$last = ord($end); |
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$n = StringHelper::byteLength($data) - $last; |
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if (StringHelper::byteSubstr($data, $n, null) == str_repeat($end, $last)) { |
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return StringHelper::byteSubstr($data, 0, $n); |
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} |
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return false; |
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} |
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/** |
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* Derives a key from the given password (PBKDF2). |
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* @param string $password the source password |
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* @param string $salt the random salt |
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* @return string the derived key |
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*/ |
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protected static function deriveKey($password, $salt) |
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{ |
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if (function_exists('hash_pbkdf2')) { |
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return hash_pbkdf2(self::DERIVATION_HASH, $password, $salt, self::DERIVATION_ITERATIONS, self::CRYPT_KEY_SIZE, true); |
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} |
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$hmac = hash_hmac(self::DERIVATION_HASH, $salt . pack('N', 1), $password, true); |
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$xorsum = $hmac; |
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for ($i = 1; $i < self::DERIVATION_ITERATIONS; $i++) { |
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$hmac = hash_hmac(self::DERIVATION_HASH, $hmac, $password, true); |
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$xorsum ^= $hmac; |
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} |
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return substr($xorsum, 0, self::CRYPT_KEY_SIZE); |
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} |
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/** |
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* Prefixes data with a keyed hash value so that it can later be detected if it is tampered. |
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* @param string $data the data to be protected |
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* @param string $key the secret key to be used for generating hash |
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* @param string $algorithm the hashing algorithm (e.g. "md5", "sha1", "sha256", etc.). Call PHP "hash_algos()" |
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* function to see the supported hashing algorithms on your system. |
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* @return string the data prefixed with the keyed hash |
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* @see validateData() |
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* @see getSecretKey() |
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*/ |
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public static function hashData($data, $key, $algorithm = 'sha256') |
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{ |
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return hash_hmac($algorithm, $data, $key) . $data; |
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} |
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/** |
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* Validates if the given data is tampered. |
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* @param string $data the data to be validated. The data must be previously |
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* generated by [[hashData()]]. |
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* @param string $key the secret key that was previously used to generate the hash for the data in [[hashData()]]. |
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* @param string $algorithm the hashing algorithm (e.g. "md5", "sha1", "sha256", etc.). Call PHP "hash_algos()" |
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* function to see the supported hashing algorithms on your system. This must be the same |
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* as the value passed to [[hashData()]] when generating the hash for the data. |
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* @return string the real data with the hash stripped off. False if the data is tampered. |
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* @see hashData() |
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*/ |
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public static function validateData($data, $key, $algorithm = 'sha256') |
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{ |
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$hashSize = StringHelper::byteLength(hash_hmac($algorithm, 'test', $key)); |
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$n = StringHelper::byteLength($data); |
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if ($n >= $hashSize) { |
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$hash = StringHelper::byteSubstr($data, 0, $hashSize); |
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$data2 = StringHelper::byteSubstr($data, $hashSize, $n - $hashSize); |
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return $hash === hash_hmac($algorithm, $data2, $key) ? $data2 : false; |
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} else { |
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return false; |
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} |
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} |
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/** |
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* Returns a secret key associated with the specified name. |
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* If the secret key does not exist, a random key will be generated |
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* and saved in the file "keys.json" under the application's runtime directory |
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* so that the same secret key can be returned in future requests. |
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* @param string $name the name that is associated with the secret key |
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* @param integer $length the length of the key that should be generated if not exists |
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* @return string the secret key associated with the specified name |
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*/ |
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public static function getSecretKey($name, $length = 32) |
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{ |
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static $keys; |
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$keyFile = Yii::$app->getRuntimePath() . '/keys.json'; |
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if ($keys === null) { |
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$keys = []; |
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if (is_file($keyFile)) { |
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$keys = json_decode(file_get_contents($keyFile), true); |
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} |
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} |
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if (!isset($keys[$name])) { |
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$keys[$name] = static::generateRandomKey($length); |
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file_put_contents($keyFile, json_encode($keys)); |
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} |
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return $keys[$name]; |
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} |
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/** |
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* Generates a random key. The key may contain uppercase and lowercase latin letters, digits, underscore, dash and dot. |
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* @param integer $length the length of the key that should be generated |
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* @return string the generated random key |
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*/ |
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public static function generateRandomKey($length = 32) |
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{ |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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$key = strtr(base64_encode(openssl_random_pseudo_bytes($length, $strong)), '+/=', '_-.'); |
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if ($strong) { |
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return substr($key, 0, $length); |
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} |
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} |
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$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-.'; |
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return substr(str_shuffle(str_repeat($chars, 5)), 0, $length); |
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} |
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/** |
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* Opens the mcrypt module. |
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* @return resource the mcrypt module handle. |
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* @throws InvalidConfigException if mcrypt extension is not installed |
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* @throws Exception if mcrypt initialization fails |
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*/ |
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protected static function openCryptModule() |
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{ |
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if (!extension_loaded('mcrypt')) { |
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throw new InvalidConfigException('The mcrypt PHP extension is not installed.'); |
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} |
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// AES uses a 128-bit block size |
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$module = @mcrypt_module_open('rijndael-128', '', 'cbc', ''); |
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if ($module === false) { |
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throw new Exception('Failed to initialize the mcrypt module.'); |
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} |
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return $module; |
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} |
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/** |
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* Generates a secure hash from a password and a random salt. |
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* |
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* The generated hash can be stored in database (e.g. `CHAR(64) CHARACTER SET latin1` on MySQL). |
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* Later when a password needs to be validated, the hash can be fetched and passed |
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* to [[validatePassword()]]. For example, |
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* |
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* ~~~ |
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* // generates the hash (usually done during user registration or when the password is changed) |
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* $hash = Security::generatePasswordHash($password); |
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* // ...save $hash in database... |
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* |
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* // during login, validate if the password entered is correct using $hash fetched from database |
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* if (Security::validatePassword($password, $hash) { |
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* // password is good |
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* } else { |
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* // password is bad |
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* } |
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* ~~~ |
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* |
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* @param string $password The password to be hashed. |
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* @param integer $cost Cost parameter used by the Blowfish hash algorithm. |
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* The higher the value of cost, |
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* the longer it takes to generate the hash and to verify a password against it. Higher cost |
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* therefore slows down a brute-force attack. For best protection against brute for attacks, |
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* set it to the highest value that is tolerable on production servers. The time taken to |
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* compute the hash doubles for every increment by one of $cost. So, for example, if the |
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* hash takes 1 second to compute when $cost is 14 then then the compute time varies as |
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* 2^($cost - 14) seconds. |
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* @throws Exception on bad password parameter or cost parameter |
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* @return string The password hash string, ASCII and not longer than 64 characters. |
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* @see validatePassword() |
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*/ |
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public static function generatePasswordHash($password, $cost = 13) |
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{ |
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$salt = static::generateSalt($cost); |
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$hash = crypt($password, $salt); |
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if (!is_string($hash) || strlen($hash) < 32) { |
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throw new Exception('Unknown error occurred while generating hash.'); |
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} |
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return $hash; |
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} |
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/** |
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* Verifies a password against a hash. |
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* @param string $password The password to verify. |
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* @param string $hash The hash to verify the password against. |
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* @return boolean whether the password is correct. |
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* @throws InvalidParamException on bad password or hash parameters or if crypt() with Blowfish hash is not available. |
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* @see generatePasswordHash() |
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*/ |
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public static function validatePassword($password, $hash) |
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{ |
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if (!is_string($password) || $password === '') { |
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throw new InvalidParamException('Password must be a string and cannot be empty.'); |
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} |
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if (!preg_match('/^\$2[axy]\$(\d\d)\$[\.\/0-9A-Za-z]{22}/', $hash, $matches) || $matches[1] < 4 || $matches[1] > 30) { |
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throw new InvalidParamException('Hash is invalid.'); |
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} |
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$test = crypt($password, $hash); |
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$n = strlen($test); |
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if ($n < 32 || $n !== strlen($hash)) { |
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return false; |
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} |
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|
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// Use a for-loop to compare two strings to prevent timing attacks. See: |
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// http://codereview.stackexchange.com/questions/13512 |
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$check = 0; |
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for ($i = 0; $i < $n; ++$i) { |
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$check |= (ord($test[$i]) ^ ord($hash[$i])); |
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} |
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return $check === 0; |
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} |
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/** |
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* Generates a salt that can be used to generate a password hash. |
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* |
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* The PHP [crypt()](http://php.net/manual/en/function.crypt.php) built-in function |
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* requires, for the Blowfish hash algorithm, a salt string in a specific format: |
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* "$2a$", "$2x$" or "$2y$", a two digit cost parameter, "$", and 22 characters |
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* from the alphabet "./0-9A-Za-z". |
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* |
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* @param integer $cost the cost parameter |
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* @return string the random salt value. |
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* @throws InvalidParamException if the cost parameter is not between 4 and 31 |
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*/ |
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protected static function generateSalt($cost = 13) |
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{ |
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$cost = (int) $cost; |
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if ($cost < 4 || $cost > 31) { |
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throw new InvalidParamException('Cost must be between 4 and 31.'); |
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} |
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// Get 20 * 8bits of random entropy |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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// https://github.com/yiisoft/yii2/pull/2422 |
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$rand = openssl_random_pseudo_bytes(20); |
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} else { |
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$rand = ''; |
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for ($i = 0; $i < 20; ++$i) { |
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$rand .= chr(mt_rand(0, 255)); |
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} |
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} |
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// Add the microtime for a little more entropy. |
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$rand .= microtime(true); |
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// Mix the bits cryptographically into a 20-byte binary string. |
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$rand = sha1($rand, true); |
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// Form the prefix that specifies Blowfish algorithm and cost parameter. |
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$salt = sprintf("$2y$%02d$", $cost); |
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// Append the random salt data in the required base64 format. |
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$salt .= str_replace('+', '.', substr(base64_encode($rand), 0, 22)); |
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return $salt; |
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} |
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} |
@ -1,29 +0,0 @@
|
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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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|
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namespace yii\helpers; |
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|
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/** |
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* Security provides a set of methods to handle common security-related tasks. |
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* |
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* In particular, Security supports the following features: |
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* |
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* - Encryption/decryption: [[encrypt()]] and [[decrypt()]] |
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* - Data tampering prevention: [[hashData()]] and [[validateData()]] |
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* - Password validation: [[generatePasswordHash()]] and [[validatePassword()]] |
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* |
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* Additionally, Security provides [[getSecretKey()]] to support generating |
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* named secret keys. These secret keys, once generated, will be stored in a file |
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* and made available in future requests. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @author Tom Worster <fsb@thefsb.org> |
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* @since 2.0 |
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*/ |
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class Security extends BaseSecurity |
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{ |
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} |
@ -1,46 +0,0 @@
|
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<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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|
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namespace yiiunit\framework\helpers; |
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use yiiunit\TestCase; |
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use yii\helpers\Security; |
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/** |
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* @group helpers |
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*/ |
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class SecurityTest extends TestCase |
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{ |
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public function testPasswordHash() |
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{ |
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$password = 'secret'; |
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$hash = Security::generatePasswordHash($password); |
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$this->assertTrue(Security::validatePassword($password, $hash)); |
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$this->assertFalse(Security::validatePassword('test', $hash)); |
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} |
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public function testHashData() |
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{ |
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$data = 'known data'; |
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$key = 'secret'; |
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$hashedData = Security::hashData($data, $key); |
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$this->assertFalse($data === $hashedData); |
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$this->assertEquals($data, Security::validateData($hashedData, $key)); |
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$hashedData[strlen($hashedData) - 1] = 'A'; |
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$this->assertFalse(Security::validateData($hashedData, $key)); |
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} |
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public function testEncrypt() |
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{ |
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$data = 'known data'; |
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$key = 'secret'; |
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$encryptedData = Security::encrypt($data, $key); |
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$this->assertFalse($data === $encryptedData); |
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$decryptedData = Security::decrypt($encryptedData, $key); |
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$this->assertEquals($data, $decryptedData); |
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} |
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} |
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