nextcloud /
server
| Total Complexity | 78 |
| Total Lines | 671 |
| Duplicated Lines | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
Complex classes like Crypt often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Crypt, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 58 | class Crypt { |
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| 59 | public const SUPPORTED_CIPHERS_AND_KEY_SIZE = [ |
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| 60 | 'AES-256-CTR' => 32, |
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| 61 | 'AES-128-CTR' => 16, |
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| 62 | 'AES-256-CFB' => 32, |
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| 63 | 'AES-128-CFB' => 16, |
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| 64 | ]; |
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| 65 | // one out of SUPPORTED_CIPHERS_AND_KEY_SIZE |
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| 66 | public const DEFAULT_CIPHER = 'AES-256-CTR'; |
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| 67 | // default cipher from old Nextcloud versions |
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| 68 | public const LEGACY_CIPHER = 'AES-128-CFB'; |
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| 69 | |||
| 70 | public const SUPPORTED_KEY_FORMATS = ['hash', 'password']; |
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| 71 | // one out of SUPPORTED_KEY_FORMATS |
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| 72 | public const DEFAULT_KEY_FORMAT = 'hash'; |
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| 73 | // default key format, old Nextcloud version encrypted the private key directly |
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| 74 | // with the user password |
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| 75 | public const LEGACY_KEY_FORMAT = 'password'; |
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| 76 | |||
| 77 | public const HEADER_START = 'HBEGIN'; |
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| 78 | public const HEADER_END = 'HEND'; |
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| 79 | |||
| 80 | /** @var ILogger */ |
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| 81 | private $logger; |
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| 82 | |||
| 83 | /** @var string */ |
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| 84 | private $user; |
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| 85 | |||
| 86 | /** @var IConfig */ |
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| 87 | private $config; |
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| 88 | |||
| 89 | /** @var IL10N */ |
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| 90 | private $l; |
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| 91 | |||
| 92 | /** @var string|null */ |
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| 93 | private $currentCipher; |
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| 94 | |||
| 95 | /** @var bool */ |
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| 96 | private $supportLegacy; |
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| 97 | |||
| 98 | /** |
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| 99 | * @param ILogger $logger |
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| 100 | * @param IUserSession $userSession |
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| 101 | * @param IConfig $config |
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| 102 | * @param IL10N $l |
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| 103 | */ |
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| 104 | public function __construct(ILogger $logger, IUserSession $userSession, IConfig $config, IL10N $l) { |
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| 105 | $this->logger = $logger; |
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| 106 | $this->user = $userSession && $userSession->isLoggedIn() ? $userSession->getUser()->getUID() : '"no user given"'; |
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| 107 | $this->config = $config; |
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| 108 | $this->l = $l; |
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| 109 | $this->supportLegacy = $this->config->getSystemValueBool('encryption.legacy_format_support', false); |
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| 110 | } |
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| 111 | |||
| 112 | /** |
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| 113 | * create new private/public key-pair for user |
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| 114 | * |
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| 115 | * @return array|bool |
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| 116 | */ |
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| 117 | public function createKeyPair() { |
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| 118 | $log = $this->logger; |
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| 119 | $res = $this->getOpenSSLPKey(); |
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| 120 | |||
| 121 | if (!$res) { |
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|
introduced
by
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| 122 | $log->error("Encryption Library couldn't generate users key-pair for {$this->user}", |
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| 123 | ['app' => 'encryption']); |
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| 124 | |||
| 125 | if (openssl_error_string()) { |
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| 126 | $log->error('Encryption library openssl_pkey_new() fails: ' . openssl_error_string(), |
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| 127 | ['app' => 'encryption']); |
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| 128 | } |
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| 129 | } elseif (openssl_pkey_export($res, |
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| 130 | $privateKey, |
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| 131 | null, |
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| 132 | $this->getOpenSSLConfig())) { |
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| 133 | $keyDetails = openssl_pkey_get_details($res); |
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| 134 | $publicKey = $keyDetails['key']; |
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| 135 | |||
| 136 | return [ |
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| 137 | 'publicKey' => $publicKey, |
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| 138 | 'privateKey' => $privateKey |
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| 139 | ]; |
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| 140 | } |
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| 141 | $log->error('Encryption library couldn\'t export users private key, please check your servers OpenSSL configuration.' . $this->user, |
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| 142 | ['app' => 'encryption']); |
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| 143 | if (openssl_error_string()) { |
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| 144 | $log->error('Encryption Library:' . openssl_error_string(), |
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| 145 | ['app' => 'encryption']); |
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| 146 | } |
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| 147 | |||
| 148 | return false; |
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| 149 | } |
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| 150 | |||
| 151 | /** |
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| 152 | * Generates a new private key |
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| 153 | * |
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| 154 | * @return resource |
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| 155 | */ |
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| 156 | public function getOpenSSLPKey() { |
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| 159 | } |
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| 160 | |||
| 161 | /** |
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| 162 | * get openSSL Config |
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| 163 | * |
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| 164 | * @return array |
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| 165 | */ |
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| 166 | private function getOpenSSLConfig() { |
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| 167 | $config = ['private_key_bits' => 4096]; |
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| 168 | $config = array_merge( |
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| 169 | $config, |
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| 170 | $this->config->getSystemValue('openssl', []) |
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| 171 | ); |
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| 172 | return $config; |
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| 173 | } |
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| 174 | |||
| 175 | /** |
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| 176 | * @param string $plainContent |
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| 177 | * @param string $passPhrase |
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| 178 | * @param int $version |
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| 179 | * @param int $position |
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| 180 | * @return false|string |
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| 181 | * @throws EncryptionFailedException |
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| 182 | */ |
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| 183 | public function symmetricEncryptFileContent($plainContent, $passPhrase, $version, $position) { |
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| 204 | } |
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| 205 | |||
| 206 | /** |
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| 207 | * generate header for encrypted file |
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| 208 | * |
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| 209 | * @param string $keyFormat see SUPPORTED_KEY_FORMATS |
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| 210 | * @return string |
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| 211 | * @throws \InvalidArgumentException |
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| 212 | */ |
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| 213 | public function generateHeader($keyFormat = self::DEFAULT_KEY_FORMAT) { |
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| 226 | } |
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| 227 | |||
| 228 | /** |
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| 229 | * @param string $plainContent |
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| 230 | * @param string $iv |
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| 231 | * @param string $passPhrase |
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| 232 | * @param string $cipher |
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| 233 | * @return string |
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| 234 | * @throws EncryptionFailedException |
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| 235 | */ |
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| 236 | private function encrypt($plainContent, $iv, $passPhrase = '', $cipher = self::DEFAULT_CIPHER) { |
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| 251 | } |
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| 252 | |||
| 253 | /** |
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| 254 | * return cipher either from config.php or the default cipher defined in |
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| 255 | * this class |
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| 256 | * |
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| 257 | * @return string |
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| 258 | */ |
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| 259 | private function getCachedCipher() { |
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| 260 | if (isset($this->currentCipher)) { |
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| 261 | return $this->currentCipher; |
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| 262 | } |
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| 263 | |||
| 264 | // Get cipher either from config.php or the default cipher defined in this class |
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| 265 | $cipher = $this->config->getSystemValue('cipher', self::DEFAULT_CIPHER); |
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| 266 | if (!isset(self::SUPPORTED_CIPHERS_AND_KEY_SIZE[$cipher])) { |
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| 267 | $this->logger->warning( |
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| 268 | sprintf( |
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| 269 | 'Unsupported cipher (%s) defined in config.php supported. Falling back to %s', |
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| 270 | $cipher, |
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| 271 | self::DEFAULT_CIPHER |
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| 272 | ), |
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| 273 | ['app' => 'encryption'] |
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| 274 | ); |
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| 275 | $cipher = self::DEFAULT_CIPHER; |
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| 276 | } |
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| 277 | |||
| 278 | // Remember current cipher to avoid frequent lookups |
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| 279 | $this->currentCipher = $cipher; |
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| 280 | return $this->currentCipher; |
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| 281 | } |
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| 282 | |||
| 283 | /** |
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| 284 | * return current encryption cipher |
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| 285 | * |
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| 286 | * @return string |
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| 287 | */ |
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| 288 | public function getCipher() { |
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| 289 | return $this->getCachedCipher(); |
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| 290 | } |
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| 291 | |||
| 292 | /** |
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| 293 | * get key size depending on the cipher |
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| 294 | * |
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| 295 | * @param string $cipher |
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| 296 | * @return int |
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| 297 | * @throws \InvalidArgumentException |
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| 298 | */ |
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| 299 | protected function getKeySize($cipher) { |
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| 308 | ) |
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| 309 | ); |
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| 310 | } |
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| 311 | |||
| 312 | /** |
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| 313 | * get legacy cipher |
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| 314 | * |
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| 315 | * @return string |
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| 316 | */ |
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| 317 | public function getLegacyCipher() { |
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| 318 | if (!$this->supportLegacy) { |
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| 319 | throw new ServerNotAvailableException('Legacy cipher is no longer supported!'); |
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| 320 | } |
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| 321 | |||
| 322 | return self::LEGACY_CIPHER; |
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| 323 | } |
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| 324 | |||
| 325 | /** |
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| 326 | * @param string $encryptedContent |
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| 327 | * @param string $iv |
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| 328 | * @return string |
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| 329 | */ |
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| 330 | private function concatIV($encryptedContent, $iv) { |
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| 331 | return $encryptedContent . '00iv00' . $iv; |
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| 332 | } |
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| 333 | |||
| 334 | /** |
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| 335 | * @param string $encryptedContent |
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| 336 | * @param string $signature |
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| 337 | * @return string |
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| 338 | */ |
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| 339 | private function concatSig($encryptedContent, $signature) { |
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| 340 | return $encryptedContent . '00sig00' . $signature; |
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| 341 | } |
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| 342 | |||
| 343 | /** |
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| 344 | * Note: This is _NOT_ a padding used for encryption purposes. It is solely |
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| 345 | * used to achieve the PHP stream size. It has _NOTHING_ to do with the |
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| 346 | * encrypted content and is not used in any crypto primitive. |
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| 347 | * |
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| 348 | * @param string $data |
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| 349 | * @return string |
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| 350 | */ |
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| 351 | private function addPadding($data) { |
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| 352 | return $data . 'xxx'; |
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| 353 | } |
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| 354 | |||
| 355 | /** |
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| 356 | * generate password hash used to encrypt the users private key |
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| 357 | * |
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| 358 | * @param string $password |
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| 359 | * @param string $cipher |
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| 360 | * @param string $uid only used for user keys |
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| 361 | * @return string |
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| 362 | */ |
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| 363 | protected function generatePasswordHash($password, $cipher, $uid = '') { |
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| 364 | $instanceId = $this->config->getSystemValue('instanceid'); |
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| 365 | $instanceSecret = $this->config->getSystemValue('secret'); |
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| 366 | $salt = hash('sha256', $uid . $instanceId . $instanceSecret, true); |
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| 367 | $keySize = $this->getKeySize($cipher); |
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| 368 | |||
| 369 | $hash = hash_pbkdf2( |
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| 370 | 'sha256', |
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| 371 | $password, |
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| 372 | $salt, |
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| 373 | 100000, |
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| 374 | $keySize, |
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| 375 | true |
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| 376 | ); |
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| 377 | |||
| 378 | return $hash; |
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| 379 | } |
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| 380 | |||
| 381 | /** |
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| 382 | * encrypt private key |
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| 383 | * |
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| 384 | * @param string $privateKey |
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| 385 | * @param string $password |
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| 386 | * @param string $uid for regular users, empty for system keys |
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| 387 | * @return false|string |
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| 388 | */ |
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| 389 | public function encryptPrivateKey($privateKey, $password, $uid = '') { |
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| 400 | } |
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| 401 | |||
| 402 | /** |
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| 403 | * @param string $privateKey |
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| 404 | * @param string $password |
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| 405 | * @param string $uid for regular users, empty for system keys |
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| 406 | * @return false|string |
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| 407 | */ |
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| 408 | public function decryptPrivateKey($privateKey, $password = '', $uid = '') { |
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| 409 | $header = $this->parseHeader($privateKey); |
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| 410 | |||
| 411 | if (isset($header['cipher'])) { |
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| 412 | $cipher = $header['cipher']; |
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| 413 | } else { |
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| 414 | $cipher = $this->getLegacyCipher(); |
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| 415 | } |
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| 416 | |||
| 417 | if (isset($header['keyFormat'])) { |
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| 418 | $keyFormat = $header['keyFormat']; |
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| 419 | } else { |
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| 420 | $keyFormat = self::LEGACY_KEY_FORMAT; |
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| 421 | } |
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| 422 | |||
| 423 | if ($keyFormat === self::DEFAULT_KEY_FORMAT) { |
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| 424 | $password = $this->generatePasswordHash($password, $cipher, $uid); |
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| 425 | } |
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| 426 | |||
| 427 | // If we found a header we need to remove it from the key we want to decrypt |
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| 428 | if (!empty($header)) { |
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| 429 | $privateKey = substr($privateKey, |
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| 430 | strpos($privateKey, |
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| 431 | self::HEADER_END) + strlen(self::HEADER_END)); |
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| 432 | } |
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| 433 | |||
| 434 | $plainKey = $this->symmetricDecryptFileContent( |
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| 435 | $privateKey, |
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| 436 | $password, |
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| 437 | $cipher, |
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| 438 | 0 |
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| 439 | ); |
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| 440 | |||
| 441 | if ($this->isValidPrivateKey($plainKey) === false) { |
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| 442 | return false; |
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| 443 | } |
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| 444 | |||
| 445 | return $plainKey; |
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| 446 | } |
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| 447 | |||
| 448 | /** |
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| 449 | * check if it is a valid private key |
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| 450 | * |
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| 451 | * @param string $plainKey |
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| 452 | * @return bool |
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| 453 | */ |
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| 454 | protected function isValidPrivateKey($plainKey) { |
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| 455 | $res = openssl_get_privatekey($plainKey); |
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| 456 | // TODO: remove resource check one php7.4 is not longer supported |
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| 457 | if (is_resource($res) || (is_object($res) && get_class($res) === 'OpenSSLAsymmetricKey')) { |
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| 458 | $sslInfo = openssl_pkey_get_details($res); |
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| 459 | if (isset($sslInfo['key'])) { |
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| 460 | return true; |
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| 461 | } |
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| 462 | } |
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| 463 | |||
| 464 | return false; |
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| 465 | } |
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| 466 | |||
| 467 | /** |
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| 468 | * @param string $keyFileContents |
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| 469 | * @param string $passPhrase |
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| 470 | * @param string $cipher |
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| 471 | * @param int $version |
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| 472 | * @param int|string $position |
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| 473 | * @return string |
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| 474 | * @throws DecryptionFailedException |
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| 475 | */ |
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| 476 | public function symmetricDecryptFileContent($keyFileContents, $passPhrase, $cipher = self::DEFAULT_CIPHER, $version = 0, $position = 0) { |
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| 477 | if ($keyFileContents == '') { |
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| 478 | return ''; |
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| 479 | } |
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| 480 | |||
| 481 | $catFile = $this->splitMetaData($keyFileContents, $cipher); |
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| 482 | |||
| 483 | if ($catFile['signature'] !== false) { |
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| 484 | try { |
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| 485 | // First try the new format |
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| 486 | $this->checkSignature($catFile['encrypted'], $passPhrase . '_' . $version . '_' . $position, $catFile['signature']); |
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| 487 | } catch (GenericEncryptionException $e) { |
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| 488 | // For compatibility with old files check the version without _ |
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| 489 | $this->checkSignature($catFile['encrypted'], $passPhrase . $version . $position, $catFile['signature']); |
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| 490 | } |
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| 491 | } |
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| 492 | |||
| 493 | return $this->decrypt($catFile['encrypted'], |
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| 494 | $catFile['iv'], |
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| 495 | $passPhrase, |
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| 496 | $cipher); |
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| 497 | } |
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| 498 | |||
| 499 | /** |
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| 500 | * check for valid signature |
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| 501 | * |
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| 502 | * @param string $data |
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| 503 | * @param string $passPhrase |
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| 504 | * @param string $expectedSignature |
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| 505 | * @throws GenericEncryptionException |
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| 506 | */ |
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| 507 | private function checkSignature($data, $passPhrase, $expectedSignature) { |
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| 508 | $enforceSignature = !$this->config->getSystemValue('encryption_skip_signature_check', false); |
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| 509 | |||
| 510 | $signature = $this->createSignature($data, $passPhrase); |
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| 511 | $isCorrectHash = hash_equals($expectedSignature, $signature); |
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| 512 | |||
| 513 | if (!$isCorrectHash && $enforceSignature) { |
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| 514 | throw new GenericEncryptionException('Bad Signature', $this->l->t('Bad Signature')); |
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| 515 | } elseif (!$isCorrectHash && !$enforceSignature) { |
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| 516 | $this->logger->info("Signature check skipped", ['app' => 'encryption']); |
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| 517 | } |
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| 518 | } |
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| 519 | |||
| 520 | /** |
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| 521 | * create signature |
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| 522 | * |
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| 523 | * @param string $data |
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| 524 | * @param string $passPhrase |
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| 525 | * @return string |
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| 526 | */ |
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| 527 | private function createSignature($data, $passPhrase) { |
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| 528 | $passPhrase = hash('sha512', $passPhrase . 'a', true); |
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| 529 | return hash_hmac('sha256', $data, $passPhrase); |
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| 530 | } |
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| 531 | |||
| 532 | |||
| 533 | /** |
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| 534 | * remove padding |
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| 535 | * |
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| 536 | * @param string $padded |
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| 537 | * @param bool $hasSignature did the block contain a signature, in this case we use a different padding |
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| 538 | * @return string|false |
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| 539 | */ |
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| 540 | private function removePadding($padded, $hasSignature = false) { |
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| 541 | if ($hasSignature === false && substr($padded, -2) === 'xx') { |
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| 542 | return substr($padded, 0, -2); |
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| 543 | } elseif ($hasSignature === true && substr($padded, -3) === 'xxx') { |
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| 544 | return substr($padded, 0, -3); |
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| 545 | } |
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| 546 | return false; |
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| 547 | } |
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| 548 | |||
| 549 | /** |
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| 550 | * split meta data from encrypted file |
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| 551 | * Note: for now, we assume that the meta data always start with the iv |
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| 552 | * followed by the signature, if available |
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| 553 | * |
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| 554 | * @param string $catFile |
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| 555 | * @param string $cipher |
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| 556 | * @return array |
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| 557 | */ |
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| 558 | private function splitMetaData($catFile, $cipher) { |
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| 559 | if ($this->hasSignature($catFile, $cipher)) { |
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| 560 | $catFile = $this->removePadding($catFile, true); |
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| 561 | $meta = substr($catFile, -93); |
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| 562 | $iv = substr($meta, strlen('00iv00'), 16); |
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| 563 | $sig = substr($meta, 22 + strlen('00sig00')); |
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| 564 | $encrypted = substr($catFile, 0, -93); |
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| 565 | } else { |
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| 566 | $catFile = $this->removePadding($catFile); |
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| 567 | $meta = substr($catFile, -22); |
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| 568 | $iv = substr($meta, -16); |
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| 569 | $sig = false; |
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| 570 | $encrypted = substr($catFile, 0, -22); |
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| 571 | } |
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| 572 | |||
| 573 | return [ |
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| 574 | 'encrypted' => $encrypted, |
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| 575 | 'iv' => $iv, |
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| 576 | 'signature' => $sig |
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| 577 | ]; |
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| 578 | } |
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| 579 | |||
| 580 | /** |
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| 581 | * check if encrypted block is signed |
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| 582 | * |
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| 583 | * @param string $catFile |
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| 584 | * @param string $cipher |
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| 585 | * @return bool |
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| 586 | * @throws GenericEncryptionException |
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| 587 | */ |
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| 588 | private function hasSignature($catFile, $cipher) { |
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| 589 | $skipSignatureCheck = $this->config->getSystemValue('encryption_skip_signature_check', false); |
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| 590 | |||
| 591 | $meta = substr($catFile, -93); |
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| 592 | $signaturePosition = strpos($meta, '00sig00'); |
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| 593 | |||
| 594 | // If we no longer support the legacy format then everything needs a signature |
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| 595 | if (!$skipSignatureCheck && !$this->supportLegacy && $signaturePosition === false) { |
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| 596 | throw new GenericEncryptionException('Missing Signature', $this->l->t('Missing Signature')); |
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| 597 | } |
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| 598 | |||
| 599 | // Enforce signature for the new 'CTR' ciphers |
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| 600 | if (!$skipSignatureCheck && $signaturePosition === false && stripos($cipher, 'ctr') !== false) { |
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| 601 | throw new GenericEncryptionException('Missing Signature', $this->l->t('Missing Signature')); |
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| 602 | } |
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| 603 | |||
| 604 | return ($signaturePosition !== false); |
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| 605 | } |
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| 606 | |||
| 607 | |||
| 608 | /** |
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| 609 | * @param string $encryptedContent |
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| 610 | * @param string $iv |
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| 611 | * @param string $passPhrase |
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| 612 | * @param string $cipher |
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| 613 | * @return string |
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| 614 | * @throws DecryptionFailedException |
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| 615 | */ |
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| 616 | private function decrypt($encryptedContent, $iv, $passPhrase = '', $cipher = self::DEFAULT_CIPHER) { |
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| 617 | $plainContent = openssl_decrypt($encryptedContent, |
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| 618 | $cipher, |
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| 619 | $passPhrase, |
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| 620 | false, |
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| 621 | $iv); |
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| 622 | |||
| 623 | if ($plainContent) { |
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| 624 | return $plainContent; |
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| 625 | } else { |
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| 626 | throw new DecryptionFailedException('Encryption library: Decryption (symmetric) of content failed: ' . openssl_error_string()); |
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| 627 | } |
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| 628 | } |
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| 629 | |||
| 630 | /** |
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| 631 | * @param string $data |
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| 632 | * @return array |
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| 633 | */ |
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| 634 | protected function parseHeader($data) { |
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| 635 | $result = []; |
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| 636 | |||
| 637 | if (substr($data, 0, strlen(self::HEADER_START)) === self::HEADER_START) { |
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| 638 | $endAt = strpos($data, self::HEADER_END); |
||
| 639 | $header = substr($data, 0, $endAt + strlen(self::HEADER_END)); |
||
| 640 | |||
| 641 | // +1 not to start with an ':' which would result in empty element at the beginning |
||
| 642 | $exploded = explode(':', |
||
| 643 | substr($header, strlen(self::HEADER_START) + 1)); |
||
| 644 | |||
| 645 | $element = array_shift($exploded); |
||
| 646 | |||
| 647 | while ($element !== self::HEADER_END) { |
||
| 648 | $result[$element] = array_shift($exploded); |
||
| 649 | $element = array_shift($exploded); |
||
| 650 | } |
||
| 651 | } |
||
| 652 | |||
| 653 | return $result; |
||
| 654 | } |
||
| 655 | |||
| 656 | /** |
||
| 657 | * generate initialization vector |
||
| 658 | * |
||
| 659 | * @return string |
||
| 660 | * @throws GenericEncryptionException |
||
| 661 | */ |
||
| 662 | private function generateIv() { |
||
| 664 | } |
||
| 665 | |||
| 666 | /** |
||
| 667 | * Generate a cryptographically secure pseudo-random 256-bit ASCII key, used |
||
| 668 | * as file key |
||
| 669 | * |
||
| 670 | * @return string |
||
| 671 | * @throws \Exception |
||
| 672 | */ |
||
| 673 | public function generateFileKey() { |
||
| 675 | } |
||
| 676 | |||
| 677 | /** |
||
| 678 | * @param $encKeyFile |
||
| 679 | * @param $shareKey |
||
| 680 | * @param $privateKey |
||
| 681 | * @return string |
||
| 682 | * @throws MultiKeyDecryptException |
||
| 683 | */ |
||
| 684 | public function multiKeyDecrypt($encKeyFile, $shareKey, $privateKey) { |
||
| 685 | if (!$encKeyFile) { |
||
| 686 | throw new MultiKeyDecryptException('Cannot multikey decrypt empty plain content'); |
||
| 687 | } |
||
| 688 | |||
| 689 | if (openssl_open($encKeyFile, $plainContent, $shareKey, $privateKey, 'RC4')) { |
||
| 690 | return $plainContent; |
||
| 691 | } else { |
||
| 692 | throw new MultiKeyDecryptException('multikeydecrypt with share key failed:' . openssl_error_string()); |
||
| 693 | } |
||
| 694 | } |
||
| 695 | |||
| 696 | /** |
||
| 697 | * @param string $plainContent |
||
| 698 | * @param array $keyFiles |
||
| 699 | * @return array |
||
| 700 | * @throws MultiKeyEncryptException |
||
| 701 | */ |
||
| 702 | public function multiKeyEncrypt($plainContent, array $keyFiles) { |
||
| 729 | } |
||
| 730 | } |
||
| 731 | } |
||
| 732 |
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