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<?php declare(strict_types=1); |
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namespace SilverStripe\MFA\Service; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Extensible; |
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use SilverStripe\Core\Injector\Injectable; |
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use SilverStripe\MFA\State\BackupCode; |
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use SilverStripe\Security\Security; |
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class BackupCodeGenerator implements BackupCodeGeneratorInterface |
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{ |
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use Configurable; |
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use Extensible; |
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use Injectable; |
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/** |
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* The number of back-up codes that should be generated for a user. Note that changing this value will not |
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* regenerate or generate new codes to meet the new number. The user will have to manually regenerate codes to |
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* receive the new number of codes. |
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* |
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* @config |
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* @var int |
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*/ |
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private static $backup_code_count = 15; |
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/** |
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* The length of each individual backup code. |
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* |
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* @config |
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* @var int |
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*/ |
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private static $backup_code_length = 9; |
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/** |
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* Generates a list of backup codes |
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* |
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* {@inheritDoc} |
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*/ |
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public function generate(): array |
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{ |
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$codeCount = (int) $this->config()->get('backup_code_count'); |
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$codeLength = (int) $this->config()->get('backup_code_length'); |
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$charset = $this->getCharacterSet(); |
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$codes = []; |
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while (count($codes) < $codeCount) { |
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$code = $this->generateCode($charset, $codeLength); |
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if (!in_array($code, $codes)) { |
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$hashData = Security::encrypt_password($code); |
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$codes[] = BackupCode::create($code, $hashData['password'], $hashData['algorithm'], $hashData['salt']); |
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} |
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} |
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return $codes; |
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} |
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public function getCharacterSet(): array |
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{ |
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$characterSet = array_merge( |
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range('a', 'z'), |
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range('A', 'Z'), |
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range(0, 9) |
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); |
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$this->extend('updateCharacterSet', $characterSet); |
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return $characterSet; |
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} |
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/** |
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* Generates a backup code at the specified string length, using a mixture of digits and mixed case letters |
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* |
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* @param array $charset |
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* @param int $codeLength |
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* @return string |
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*/ |
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protected function generateCode(array $charset, int $codeLength = 9): string |
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{ |
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$characters = []; |
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$numberOfOptions = count($charset); |
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while (count($characters) < $codeLength) { |
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$key = random_int(0, $numberOfOptions - 1); // zero based array |
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$characters[] = $charset[$key]; |
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} |
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return implode($characters); |
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} |
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} |
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silverstripe /
silverstripe-mfa
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