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| 1 | <?php |
| 2 | /** |
| 3 | * A Compatibility library with PHP 5.5's simplified password hashing API. |
| 4 | * |
| 5 | * @author Anthony Ferrara <ircmaxell@php.net> |
| 6 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
| 7 | * @copyright 2012 The Authors |
| 8 | */ |
| 9 | |
| 10 | namespace { |
| 11 | |
| 12 | if (!defined('PASSWORD_DEFAULT')) { |
| 13 | |
| 14 | define('PASSWORD_BCRYPT', 1); |
| 15 | define('PASSWORD_DEFAULT', PASSWORD_BCRYPT); |
| 16 | |
| 17 | /** |
| 18 | * Hash the password using the specified algorithm |
| 19 | * |
| 20 | * @param string $password The password to hash |
| 21 | * @param int $algo The algorithm to use (Defined by PASSWORD_* constants) |
| 22 | * @param array $options The options for the algorithm to use |
| 23 | * |
| 24 | * @return string|false The hashed password, or false on error. |
| 25 | */ |
| 26 | function password_hash($password, $algo, array $options = array()) { |
| 27 | if (!function_exists('crypt')) { |
| 28 | trigger_error("Crypt must be loaded for password_hash to function", E_USER_WARNING); |
| 29 | return null; |
| 30 | } |
| 31 | if (!is_string($password)) { |
| 32 | trigger_error("password_hash(): Password must be a string", E_USER_WARNING); |
| 33 | return null; |
| 34 | } |
| 35 | if (!is_int($algo)) { |
| 36 | trigger_error("password_hash() expects parameter 2 to be long, " . gettype($algo) . " given", E_USER_WARNING); |
| 37 | return null; |
| 38 | } |
| 39 | $resultLength = 0; |
| 40 | switch ($algo) { |
| 41 | case PASSWORD_BCRYPT: |
| 42 | // Note that this is a C constant, but not exposed to PHP, so we don't define it here. |
| 43 | $cost = 10; |
| 44 | if (isset($options['cost'])) { |
| 45 | $cost = $options['cost']; |
| 46 | if ($cost < 4 || $cost > 31) { |
| 47 | trigger_error(sprintf("password_hash(): Invalid bcrypt cost parameter specified: %d", $cost), E_USER_WARNING); |
| 48 | return null; |
| 49 | } |
| 50 | } |
| 51 | // The length of salt to generate |
| 52 | $raw_salt_len = 16; |
| 53 | // The length required in the final serialization |
| 54 | $required_salt_len = 22; |
| 55 | $hash_format = sprintf("$2y$%02d$", $cost); |
| 56 | // The expected length of the final crypt() output |
| 57 | $resultLength = 60; |
| 58 | break; |
| 59 | default: |
| 60 | trigger_error(sprintf("password_hash(): Unknown password hashing algorithm: %s", $algo), E_USER_WARNING); |
| 61 | return null; |
| 62 | } |
| 63 | $salt_requires_encoding = false; |
| 64 | if (isset($options['salt'])) { |
| 65 | switch (gettype($options['salt'])) { |
| 66 | case 'NULL': |
| 67 | case 'boolean': |
| 68 | case 'integer': |
| 69 | case 'double': |
| 70 | case 'string': |
| 71 | $salt = (string) $options['salt']; |
| 72 | break; |
| 73 | case 'object': |
| 74 | if (method_exists($options['salt'], '__tostring')) { |
| 75 | $salt = (string) $options['salt']; |
| 76 | break; |
| 77 | } |
| 78 | case 'array': |
| 79 | case 'resource': |
| 80 | default: |
| 81 | trigger_error('password_hash(): Non-string salt parameter supplied', E_USER_WARNING); |
| 82 | return null; |
| 83 | } |
| 84 | if (PasswordCompat\binary\_strlen($salt) < $required_salt_len) { |
| 85 | trigger_error(sprintf("password_hash(): Provided salt is too short: %d expecting %d", PasswordCompat\binary\_strlen($salt), $required_salt_len), E_USER_WARNING); |
| 86 | return null; |
| 87 | } elseif (0 == preg_match('#^[a-zA-Z0-9./]+$#D', $salt)) { |
| 88 | $salt_requires_encoding = true; |
| 89 | } |
| 90 | } else { |
| 91 | $buffer = ''; |
| 92 | $buffer_valid = false; |
| 93 | if (function_exists('mcrypt_create_iv') && !defined('PHALANGER')) { |
| 94 | $buffer = mcrypt_create_iv($raw_salt_len, MCRYPT_DEV_URANDOM); |
| 95 | if ($buffer) { |
| 96 | $buffer_valid = true; |
| 97 | } |
| 98 | } |
| 99 | if (!$buffer_valid && function_exists('openssl_random_pseudo_bytes')) { |
| 100 | $buffer = openssl_random_pseudo_bytes($raw_salt_len); |
| 101 | if ($buffer) { |
| 102 | $buffer_valid = true; |
| 103 | } |
| 104 | } |
| 105 | if (!$buffer_valid && @is_readable('/dev/urandom')) { |
| 106 | $f = fopen('/dev/urandom', 'r'); |
| 107 | $read = PasswordCompat\binary\_strlen($buffer); |
| 108 | while ($read < $raw_salt_len) { |
| 109 | $buffer .= fread($f, $raw_salt_len - $read); |
| 110 | $read = PasswordCompat\binary\_strlen($buffer); |
| 111 | } |
| 112 | fclose($f); |
| 113 | if ($read >= $raw_salt_len) { |
| 114 | $buffer_valid = true; |
| 115 | } |
| 116 | } |
| 117 | if (!$buffer_valid || PasswordCompat\binary\_strlen($buffer) < $raw_salt_len) { |
| 118 | $bl = PasswordCompat\binary\_strlen($buffer); |
| 119 | for ($i = 0; $i < $raw_salt_len; $i++) { |
| 120 | if ($i < $bl) { |
| 121 | $buffer[$i] = $buffer[$i] ^ chr(mt_rand(0, 255)); |
| 122 | } else { |
| 123 | $buffer .= chr(mt_rand(0, 255)); |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | $salt = $buffer; |
| 128 | $salt_requires_encoding = true; |
| 129 | } |
| 130 | if ($salt_requires_encoding) { |
| 131 | // encode string with the Base64 variant used by crypt |
| 132 | $base64_digits = |
| 133 | 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'; |
| 134 | $bcrypt64_digits = |
| 135 | './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; |
| 136 | |
| 137 | $base64_string = base64_encode($salt); |
| 138 | $salt = strtr(rtrim($base64_string, '='), $base64_digits, $bcrypt64_digits); |
| 139 | } |
| 140 | $salt = PasswordCompat\binary\_substr($salt, 0, $required_salt_len); |
| 141 | |
| 142 | $hash = $hash_format . $salt; |
| 143 | |
| 144 | $ret = crypt($password, $hash); |
| 145 | |
| 146 | if (!is_string($ret) || PasswordCompat\binary\_strlen($ret) != $resultLength) { |
| 147 | return false; |
| 148 | } |
| 149 | |
| 150 | return $ret; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Get information about the password hash. Returns an array of the information |
| 155 | * that was used to generate the password hash. |
| 156 | * |
| 157 | * array( |
| 158 | * 'algo' => 1, |
| 159 | * 'algoName' => 'bcrypt', |
| 160 | * 'options' => array( |
| 161 | * 'cost' => 10, |
| 162 | * ), |
| 163 | * ) |
| 164 | * |
| 165 | * @param string $hash The password hash to extract info from |
| 166 | * |
| 167 | * @return array The array of information about the hash. |
| 168 | */ |
| 169 | function password_get_info($hash) { |
| 170 | $return = array( |
| 171 | 'algo' => 0, |
| 172 | 'algoName' => 'unknown', |
| 173 | 'options' => array(), |
| 174 | ); |
| 175 | if (PasswordCompat\binary\_substr($hash, 0, 4) == '$2y$' && PasswordCompat\binary\_strlen($hash) == 60) { |
| 176 | $return['algo'] = PASSWORD_BCRYPT; |
| 177 | $return['algoName'] = 'bcrypt'; |
| 178 | list($cost) = sscanf($hash, "$2y$%d$"); |
| 179 | $return['options']['cost'] = $cost; |
| 180 | } |
| 181 | return $return; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Determine if the password hash needs to be rehashed according to the options provided |
| 186 | * |
| 187 | * If the answer is true, after validating the password using password_verify, rehash it. |
| 188 | * |
| 189 | * @param string $hash The hash to test |
| 190 | * @param int $algo The algorithm used for new password hashes |
| 191 | * @param array $options The options array passed to password_hash |
| 192 | * |
| 193 | * @return boolean True if the password needs to be rehashed. |
| 194 | */ |
| 195 | function password_needs_rehash($hash, $algo, array $options = array()) { |
| 196 | $info = password_get_info($hash); |
| 197 | if ($info['algo'] != $algo) { |
| 198 | return true; |
| 199 | } |
| 200 | switch ($algo) { |
| 201 | case PASSWORD_BCRYPT: |
| 202 | $cost = isset($options['cost']) ? $options['cost'] : 10; |
| 203 | if ($cost != $info['options']['cost']) { |
| 204 | return true; |
| 205 | } |
| 206 | break; |
| 207 | } |
| 208 | return false; |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Verify a password against a hash using a timing attack resistant approach |
| 213 | * |
| 214 | * @param string $password The password to verify |
| 215 | * @param string $hash The hash to verify against |
| 216 | * |
| 217 | * @return boolean If the password matches the hash |
| 218 | */ |
| 219 | function password_verify($password, $hash) { |
| 220 | if (!function_exists('crypt')) { |
| 221 | trigger_error("Crypt must be loaded for password_verify to function", E_USER_WARNING); |
| 222 | return false; |
| 223 | } |
| 224 | $ret = crypt($password, $hash); |
| 225 | if (!is_string($ret) || PasswordCompat\binary\_strlen($ret) != PasswordCompat\binary\_strlen($hash) || PasswordCompat\binary\_strlen($ret) <= 13) { |
| 226 | return false; |
| 227 | } |
| 228 | |
| 229 | $status = 0; |
| 230 | for ($i = 0; $i < PasswordCompat\binary\_strlen($ret); $i++) { |
| 231 | $status |= (ord($ret[$i]) ^ ord($hash[$i])); |
| 232 | } |
| 233 | |
| 234 | return $status === 0; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | } |
| 239 | |
| 240 | namespace PasswordCompat\binary { |
| 241 | /** |
| 242 | * Count the number of bytes in a string |
| 243 | * |
| 244 | * We cannot simply use strlen() for this, because it might be overwritten by the mbstring extension. |
| 245 | * In this case, strlen() will count the number of *characters* based on the internal encoding. A |
| 246 | * sequence of bytes might be regarded as a single multibyte character. |
| 247 | * |
| 248 | * @param string $binary_string The input string |
| 249 | * |
| 250 | * @internal |
| 251 | * @return int The number of bytes |
| 252 | */ |
| 253 | function _strlen($binary_string) { |
| 254 | if (function_exists('mb_strlen')) { |
| 255 | return mb_strlen($binary_string, '8bit'); |
| 256 | } |
| 257 | return strlen($binary_string); |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Get a substring based on byte limits |
| 262 | * |
| 263 | * @see _strlen() |
| 264 | * |
| 265 | * @param string $binary_string The input string |
| 266 | * @param int $start |
| 267 | * @param int $length |
| 268 | * |
| 269 | * @internal |
| 270 | * @return string The substring |
| 271 | */ |
| 272 | function _substr($binary_string, $start, $length) { |
| 273 | if (function_exists('mb_substr')) { |
| 274 | return mb_substr($binary_string, $start, $length, '8bit'); |
| 275 | } |
| 276 | return substr($binary_string, $start, $length); |
| 277 | } |
| 278 | |
| 279 | } |