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DataEncryption.php
417 lines
| 1 | <?php |
| 2 | |
| 3 | namespace WPStaging\Framework\Security; |
| 4 | |
| 5 | use WPStaging\Framework\Facades\Hooks; |
| 6 | use WPStaging\Vendor\phpseclib3\Crypt\RSA; |
| 7 | use WPStaging\Vendor\phpseclib3\Crypt\PublicKeyLoader; |
| 8 | |
| 9 | use function WPStaging\functions\debug_log; |
| 10 | |
| 11 | |
| 12 | |
| 13 | |
| 14 | |
| 15 | |
| 16 | |
| 17 | |
| 18 | class DataEncryption |
| 19 | { |
| 20 | |
| 21 | const FILTER_FRAMEWORK_SECURITY_DATA_ENCRYPTION_USE_SSL = 'wpstg.framework.security.dataEncryption.useSsl'; |
| 22 | |
| 23 | |
| 24 | private $hasSsl; |
| 25 | |
| 26 | |
| 27 | private $prefix; |
| 28 | |
| 29 | |
| 30 | private $key; |
| 31 | |
| 32 | |
| 33 | private $salt; |
| 34 | |
| 35 | public function __construct() |
| 36 | { |
| 37 | if (!Hooks::applyFilters(self::FILTER_FRAMEWORK_SECURITY_DATA_ENCRYPTION_USE_SSL, true)) { |
| 38 | $this->hasSsl = false; |
| 39 | } else { |
| 40 | $this->hasSsl = extension_loaded('openssl') && function_exists('openssl_encrypt') && function_exists('openssl_decrypt') && (bool)in_array('aes-256-ctr', openssl_get_cipher_methods()); |
| 41 | } |
| 42 | |
| 43 | $this->prefix = '!wpstg!'; |
| 44 | $this->key = $this->getDefaultKey(); |
| 45 | $this->salt = $this->getDefaultSalt(); |
| 46 | } |
| 47 | |
| 48 | public function isPhpSecLibAvailable(): bool |
| 49 | { |
| 50 | return class_exists(\WPStaging\Vendor\phpseclib3\Crypt\PublicKeyLoader::class); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | |
| 55 | |
| 56 | |
| 57 | public function encrypt($value): string |
| 58 | { |
| 59 | if ($this->hasSsl) { |
| 60 | return $this->sslEncrypt($value); |
| 61 | } |
| 62 | |
| 63 | return $this->base64Encrypt($value); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | |
| 68 | |
| 69 | |
| 70 | public function decrypt(string $value): string |
| 71 | { |
| 72 | if ($this->verifyPrefix($value, 'ssl')) { |
| 73 | return $this->sslDecrypt($value); |
| 74 | } |
| 75 | |
| 76 | return $this->base64Decrypt($value); |
| 77 | } |
| 78 | |
| 79 | |
| 80 | |
| 81 | |
| 82 | |
| 83 | protected function base64Encrypt($value): string |
| 84 | { |
| 85 | if (!$this->isValidKeySalt() || $value === '' || $this->isEncrypted($value)) { |
| 86 | return (string)$value; |
| 87 | } |
| 88 | |
| 89 | $mykey = $this->key . $this->salt; |
| 90 | $encpad = substr($mykey, 0, 12); |
| 91 | $value = $encpad . $value; |
| 92 | |
| 93 | // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode |
| 94 | $pad = base64_decode($mykey); |
| 95 | $valueLen = strlen($value); |
| 96 | $encrypted = ''; |
| 97 | $x = 0; |
| 98 | for ($i = 0; $i < $valueLen; $i++, $x++) { |
| 99 | if (!isset($pad[$x])) { |
| 100 | $x = 0; |
| 101 | } |
| 102 | |
| 103 | $padi = $pad[$x]; |
| 104 | $encrypted .= chr(ord($value[$i]) ^ ord($padi)); |
| 105 | } |
| 106 | |
| 107 | return $this->setPrefixType('b64') . $this->normalizeBase64Encode($encrypted); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | |
| 112 | |
| 113 | |
| 114 | protected function base64Decrypt(string $inputValue): string |
| 115 | { |
| 116 | if (!$this->isValidKeySalt() || !is_string($inputValue) || $inputValue === '' || !$this->isEncrypted($inputValue) || !$this->verifyPrefix($inputValue, 'b64')) { |
| 117 | return $inputValue; |
| 118 | } |
| 119 | |
| 120 | $value = $this->stripPrefix($inputValue, 'b64'); |
| 121 | $mykey = $this->key . $this->salt; |
| 122 | |
| 123 | // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode |
| 124 | $pad = base64_decode($mykey); |
| 125 | $encrypted = $this->normalizeBase64Decode($value); |
| 126 | $encryptedLen = strlen($encrypted); |
| 127 | $decrypted = ''; |
| 128 | $x = 0; |
| 129 | for ($i = 0; $i < $encryptedLen; $i++, $x++) { |
| 130 | if (!isset($pad[$x])) { |
| 131 | $x = 0; |
| 132 | } |
| 133 | |
| 134 | $padi = $pad[$x]; |
| 135 | $decrypted .= chr(ord($encrypted[$i]) ^ ord($padi)); |
| 136 | } |
| 137 | |
| 138 | $encpad = substr($mykey, 0, 12); |
| 139 | $enclen = strlen($encpad); |
| 140 | $envpad = substr($decrypted, 0, $enclen); |
| 141 | |
| 142 | if ($encpad !== $envpad) { |
| 143 | return $inputValue; |
| 144 | } |
| 145 | |
| 146 | $decrypted = substr($decrypted, $enclen); |
| 147 | return $decrypted; |
| 148 | } |
| 149 | |
| 150 | |
| 151 | |
| 152 | |
| 153 | |
| 154 | protected function sslEncrypt($value): string |
| 155 | { |
| 156 | if (!$this->isValidKeySalt() || $value === '' || !$this->hasSsl || $this->isEncrypted($value)) { |
| 157 | return (string)$value; |
| 158 | } |
| 159 | |
| 160 | $method = 'aes-256-ctr'; |
| 161 | $ivlen = openssl_cipher_iv_length($method); |
| 162 | $iv = openssl_random_pseudo_bytes($ivlen); |
| 163 | |
| 164 | $rawValue = openssl_encrypt($value . $this->salt, $method, $this->key, 0, $iv); |
| 165 | if (!$rawValue) { |
| 166 | return (string)$value; |
| 167 | } |
| 168 | |
| 169 | return $this->setPrefixType('ssl') . $this->normalizeBase64Encode($iv . $rawValue); |
| 170 | } |
| 171 | |
| 172 | |
| 173 | |
| 174 | |
| 175 | |
| 176 | protected function sslDecrypt(string $inputValue): string |
| 177 | { |
| 178 | if (!$this->isValidKeySalt() || !is_string($inputValue) || $inputValue === '' || !$this->hasSsl || !$this->isEncrypted($inputValue) || !$this->verifyPrefix($inputValue, 'ssl')) { |
| 179 | return $inputValue; |
| 180 | } |
| 181 | |
| 182 | $rawValue = $this->stripPrefix($inputValue, 'ssl'); |
| 183 | $rawValue = $this->normalizeBase64Decode($rawValue); |
| 184 | |
| 185 | $method = 'aes-256-ctr'; |
| 186 | $ivlen = openssl_cipher_iv_length($method); |
| 187 | $iv = substr($rawValue, 0, $ivlen); |
| 188 | |
| 189 | $rawValue = substr($rawValue, $ivlen); |
| 190 | |
| 191 | $value = openssl_decrypt($rawValue, $method, $this->key, 0, $iv); |
| 192 | if (!$value || $this->salt !== substr($value, - strlen($this->salt))) { |
| 193 | return $inputValue; |
| 194 | } |
| 195 | |
| 196 | return substr($value, 0, - strlen($this->salt)); |
| 197 | } |
| 198 | |
| 199 | |
| 200 | protected function disableUseSssl() |
| 201 | { |
| 202 | $this->hasSsl = false; |
| 203 | return true; |
| 204 | } |
| 205 | |
| 206 | |
| 207 | |
| 208 | |
| 209 | |
| 210 | public function setKey(string $value): string |
| 211 | { |
| 212 | $this->key = (string)$value; |
| 213 | return $this->key; |
| 214 | } |
| 215 | |
| 216 | |
| 217 | |
| 218 | |
| 219 | |
| 220 | public function setSalt(string $value): string |
| 221 | { |
| 222 | $this->salt = (string)$value; |
| 223 | return $this->salt; |
| 224 | } |
| 225 | |
| 226 | |
| 227 | public function getKey(): string |
| 228 | { |
| 229 | return $this->key; |
| 230 | } |
| 231 | |
| 232 | |
| 233 | public function getSalt(): string |
| 234 | { |
| 235 | return $this->salt; |
| 236 | } |
| 237 | |
| 238 | |
| 239 | |
| 240 | |
| 241 | |
| 242 | |
| 243 | protected function verifyPrefix(string $value, string $type): bool |
| 244 | { |
| 245 | $type = '!' . $type . '!'; |
| 246 | return substr($value, 0, strlen($this->prefix . $type)) === $this->prefix . $type; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | |
| 251 | |
| 252 | |
| 253 | public function isEncrypted(string $value): bool |
| 254 | { |
| 255 | return preg_match('@^' . preg_quote($this->prefix, '@') . '!(b64|ssl|rsa)!([a-zA-Z0-9\-_]+)$@', $value); |
| 256 | } |
| 257 | |
| 258 | |
| 259 | protected function isValidKeySalt(): bool |
| 260 | { |
| 261 | $key = $this->getKey(); |
| 262 | $salt = $this->getSalt(); |
| 263 | return (!empty($key) && is_string($key)) && (!empty($salt) && is_string($salt)); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | protected function getPrefix(): string |
| 268 | { |
| 269 | return $this->prefix; |
| 270 | } |
| 271 | |
| 272 | |
| 273 | |
| 274 | |
| 275 | |
| 276 | protected function setPrefix(string $value): string |
| 277 | { |
| 278 | $this->prefix = $value; |
| 279 | return $this->prefix; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | private function getDefaultKey() |
| 284 | { |
| 285 | if (defined('WPSTG_ENCRYPTION_KEY') && !empty(WPSTG_ENCRYPTION_KEY) && is_string(WPSTG_ENCRYPTION_KEY)) { |
| 286 | return WPSTG_ENCRYPTION_KEY; |
| 287 | } |
| 288 | |
| 289 | if (defined('AUTH_KEY') && !empty(AUTH_KEY) && is_string(AUTH_KEY)) { |
| 290 | return AUTH_KEY; |
| 291 | } |
| 292 | |
| 293 | return false; |
| 294 | } |
| 295 | |
| 296 | |
| 297 | private function getDefaultSalt() |
| 298 | { |
| 299 | if (defined('WPSTG_ENCRYPTION_SALT') && !empty(WPSTG_ENCRYPTION_SALT) && is_string(WPSTG_ENCRYPTION_SALT)) { |
| 300 | return WPSTG_ENCRYPTION_SALT; |
| 301 | } |
| 302 | |
| 303 | if (defined('AUTH_SALT') && !empty(AUTH_SALT) && is_string(AUTH_SALT)) { |
| 304 | return AUTH_SALT; |
| 305 | } |
| 306 | |
| 307 | return false; |
| 308 | } |
| 309 | |
| 310 | |
| 311 | |
| 312 | |
| 313 | |
| 314 | |
| 315 | private function stripPrefix(string $value, string $type): string |
| 316 | { |
| 317 | $type = '!' . $type . '!'; |
| 318 | return substr($value, strlen($this->prefix . $type)); |
| 319 | } |
| 320 | |
| 321 | |
| 322 | |
| 323 | |
| 324 | |
| 325 | private function setPrefixType(string $type): string |
| 326 | { |
| 327 | return $this->prefix . '!' . $type . '!'; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | |
| 332 | |
| 333 | |
| 334 | private function normalizeBase64Encode(string $value): string |
| 335 | { |
| 336 | // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode |
| 337 | return str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($value)); |
| 338 | } |
| 339 | |
| 340 | |
| 341 | |
| 342 | |
| 343 | |
| 344 | private function normalizeBase64Decode(string $value) |
| 345 | { |
| 346 | // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode |
| 347 | return base64_decode(str_replace(['-', '_'], ['+', '/'], $value)); |
| 348 | } |
| 349 | |
| 350 | public function getPublicKey(): string |
| 351 | { |
| 352 | $keyPath = WPSTG_RESOURCES_DIR . '/wpstg-public-key.pem'; |
| 353 | |
| 354 | if (!file_exists($keyPath)) { |
| 355 | return ''; |
| 356 | } |
| 357 | |
| 358 | $keyData = file_get_contents($keyPath); |
| 359 | return $keyData; |
| 360 | } |
| 361 | |
| 362 | public function generateKeys(): array |
| 363 | { |
| 364 | $privateKey = RSA::createKey(); |
| 365 | $publicKey = $privateKey->getPublicKey(); |
| 366 | |
| 367 | return [ |
| 368 | 'publicKey' => $publicKey, |
| 369 | 'privateKey' => $privateKey, |
| 370 | ]; |
| 371 | } |
| 372 | |
| 373 | |
| 374 | |
| 375 | |
| 376 | |
| 377 | |
| 378 | public function rsaEncrypt($value, string $publicKey): string |
| 379 | { |
| 380 | if ($value === '' || $this->isEncrypted($value)) { |
| 381 | return (string)$value; |
| 382 | } |
| 383 | |
| 384 | $keyHandle = PublicKeyLoader::load($publicKey); |
| 385 | if (!is_object($keyHandle) || !strpos(get_class($keyHandle), 'RSA\PublicKey') || !method_exists($keyHandle, 'encrypt')) { |
| 386 | debug_log(sprintf('[DataEncryption] Failed to load public key: %s', get_class($keyHandle)), 'info', false); |
| 387 | return (string)$value; |
| 388 | } |
| 389 | |
| 390 | $cipherText = $keyHandle->encrypt($value); |
| 391 | return $this->setPrefixType('rsa') . $this->normalizeBase64Encode($cipherText); |
| 392 | } |
| 393 | |
| 394 | |
| 395 | |
| 396 | |
| 397 | |
| 398 | |
| 399 | public function rsaDecrypt(string $inputValue, string $privateKey): string |
| 400 | { |
| 401 | if (!is_string($inputValue) || $inputValue === '' || !$this->isEncrypted($inputValue) || !$this->verifyPrefix($inputValue, 'rsa')) { |
| 402 | return $inputValue; |
| 403 | } |
| 404 | |
| 405 | $keyHandle = PublicKeyLoader::load($privateKey); |
| 406 | if (!is_object($keyHandle) || !strpos(get_class($keyHandle), 'RSA\PrivateKey') || !method_exists($keyHandle, 'decrypt')) { |
| 407 | debug_log(sprintf('[DataEncryption] Failed to load private key: %s', get_class($keyHandle)), 'info', false); |
| 408 | return $inputValue; |
| 409 | } |
| 410 | |
| 411 | $value = $this->stripPrefix($inputValue, 'rsa'); |
| 412 | $value = $this->normalizeBase64Decode($value); |
| 413 | |
| 414 | return $keyHandle->decrypt($value); |
| 415 | } |
| 416 | } |
| 417 |