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<?php |
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/** |
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* Linna Cross-site Request Forgery Guard |
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* |
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* @author Sebastian Rapetti <[email protected]> |
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* @copyright (c) 2020, Sebastian Rapetti |
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* @license http://opensource.org/licenses/MIT MIT License |
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*/ |
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declare(strict_types=1); |
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namespace Linna\CsrfGuard\Provider; |
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use Linna\CsrfGuard\Exception\BadExpireException; |
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use Linna\CsrfGuard\Exception\BadStorageSizeException; |
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use Linna\CsrfGuard\Exception\BadTokenLenghtException; |
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use Linna\CsrfGuard\Exception\BadExpireTrait; |
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use Linna\CsrfGuard\Exception\BadStorageSizeTrait; |
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use Linna\CsrfGuard\Exception\BadTokenLenghtTrait; |
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/** |
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* Syncronizer token provider |
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*/ |
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class SynchronizerTokenProvider implements TokenProviderInterface |
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{ |
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use BadExpireTrait, BadStorageSizeTrait, BadTokenLenghtTrait; |
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/** |
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* @var string CSRF_TOKEN_STORAGE Token storage key name in session array |
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*/ |
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private const CSRF_TOKEN_STORAGE = 'csrf_syncronizer_token'; |
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/** |
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* @var string $sessionId Session id of the current session |
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*/ |
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private string $sessionId = ''; |
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/** |
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* @var int $expire Token validity in seconds, default 600 -> 10 minutes |
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*/ |
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private int $expire = 0; |
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/** |
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* @var int $tokenLenght Token lenght in chars |
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*/ |
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private int $tokenLenght = 32; |
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/** |
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* @var int $storageSize Maximum token nonces stored in session |
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*/ |
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private int $storageSize = 10; |
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/** |
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* Class constructor. |
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* |
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* @param string $sessionId Session id of the current session |
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* @param int $expire Token validity in seconds, default 600 -> 10 minutes |
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* @param int $storageSize Maximum token nonces stored in session |
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* @param int $tokenLenght Token lenght in bytes |
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* |
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* @throws BadExpireException If $expire is less than 0 and greater than 86400 |
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* @throws BadStorageSizeException If $storageSize is less than 2 and greater than 64 |
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* @throws BadTokenLenghtException If $tokenLenght is less than 16 and greater than 128 |
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*/ |
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public function __construct(string $sessionId, int $expire = 600, int $storageSize = 10, int $tokenLenght = 32) |
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{ |
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// from BadExpireTrait, BadStorageSizeTrait, BadTokenLenghtException |
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/** @throws BadExpireException */ |
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$this->checkBadExpire($expire); |
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/** @throws BadStorageSizeException */ |
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$this->checkBadStorageSize($storageSize); |
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/** @throws BadTokenLenghtException */ |
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$this->checkBadTokenLenght($tokenLenght); |
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$this->sessionId = $sessionId; |
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$this->expire = $expire; |
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$this->tokenLenght = $tokenLenght; |
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$this->storageSize = $storageSize; |
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//if any token stored, initialize the session storage |
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$_SESSION[static::CSRF_TOKEN_STORAGE] ??= []; |
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} |
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/** |
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* Return new Synchronizer based Token. |
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* |
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* @return string A hex token |
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*/ |
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public function getToken(): string |
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{ |
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//generate new token |
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$token = \bin2hex(\random_bytes($this->tokenLenght)); |
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$time = \base_convert((string) \time(), 10, 16); |
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//store new token |
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$_SESSION[static::CSRF_TOKEN_STORAGE][] = $token.$time; |
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//check if the storage is growt beyond the maximun size |
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if (\count($_SESSION[static::CSRF_TOKEN_STORAGE]) > $this->storageSize) { |
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//remove the oldest stores nonce |
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\array_shift($_SESSION[static::CSRF_TOKEN_STORAGE]); |
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} |
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return $token; |
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} |
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/** |
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* Validate Synchronizer based Token. |
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* |
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* @param string $token Token must be validated, hex format |
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* |
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* @return bool |
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*/ |
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public function validate(string $token): bool |
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{ |
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//reference to token storage in session |
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$tokens = &$_SESSION[static::CSRF_TOKEN_STORAGE]; |
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//get current size of token storage in session |
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$size = \count($tokens); |
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//bytes to b16 chars |
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$chars = $this->tokenLenght * 2; |
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//current time |
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$time = \time(); |
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for ($i = $size -1; $i > -1; $i--) { |
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//get token from storage |
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//if token in storage doesn't match user token continue |
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if (($tmpToken = \substr($tokens[$i], 0, $chars)) !== $token) { |
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continue; |
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} |
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//get time from storage |
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$tmpTime = \substr($tokens[$i], $chars); |
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//timestamp from token time |
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$timestamp = (int) \base_convert($tmpTime, 16, 10); |
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//token expiration check |
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if (($timestamp + $this->expire) > $time) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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linna /
csrf-guard
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