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<?php |
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namespace ElliotSawyer\TOTPAuthenticator; |
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use Firesphere\BootstrapMFA\Authenticators\BootstrapMFAAuthenticator; |
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use lfkeitel\phptotp\Base32; |
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use lfkeitel\phptotp\Totp; |
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use SilverStripe\Control\HTTPRequest; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\ORM\ValidationResult; |
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use SilverStripe\Security\Member; |
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/** |
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* Class TOTPAuthenticator |
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* @package ElliotSawyer\TOTPAuthenticator |
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*/ |
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class TOTPAuthenticator extends BootstrapMFAAuthenticator |
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{ |
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use Configurable; |
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/** |
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* Google Authenticator and Authy only support tokens generated with SHA-1 |
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* Other authenticators MAY implement SHA-256 or SHA-512 as outlined in RFC6238 |
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* You may use the Config API to adjust this algorithm if you need to support |
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* a specific TOTP authenticator |
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*/ |
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private static $algorithm = 'sha1'; |
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/** |
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* @param string $link |
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* @return \SilverStripe\Security\MemberAuthenticator\LoginHandler|static |
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*/ |
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public function getLoginHandler($link) |
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{ |
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return TOTPLoginHandler::create($link, $this); |
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} |
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/** |
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* @param array $data |
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* @param HTTPRequest $request |
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* @param ValidationResult $result |
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* @return bool|null|Member |
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* @throws \Exception |
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*/ |
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public function validateTOTP($data, $request, &$result) |
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{ |
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$memberID = $request->getSession()->get(BootstrapMFAAuthenticator::SESSION_KEY . '.MemberID'); |
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// First, let's see if we know the member |
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/** @var Member $member */ |
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$member = Member::get()->byID($memberID); |
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// Continue if we have a valid member |
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if ($member && $member instanceof Member) { |
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if (!isset($data['token'])) { |
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$member->registerFailedLogin(); |
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$result->addError(_t(self::class . '.NOTOKEN', 'No token sent')); |
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} else { |
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$secret = Base32::decode($member->TOTPSecret); |
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$key = $this->getTokenFromTOTP($secret); |
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$user_submitted_key = $data['token']; |
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if ($user_submitted_key !== $key) { |
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$result->addError(_t(self::class . '.TOTPFAILED', 'TOTP Failed')); |
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} |
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} |
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if ($result->isValid()) { |
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return $member; |
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} |
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} |
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$result->addError(_t(self::class . '.NOMEMBER', 'Member not found')); |
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return $result; |
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} |
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/** |
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* Given a TOTP secret, use Totp to resolve to a one time token |
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* |
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* @param string $secret |
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* @param string $algorithm If not provided, will default to the configured algorithm |
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* @return bool|int|string |
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*/ |
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protected function getTokenFromTOTP($secret, $algorithm = '') |
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{ |
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if (!$algorithm) { |
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$algorithm = self::get_algorithm(); |
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} |
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$totp = new Totp($algorithm); |
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return $totp->GenerateToken($secret); |
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} |
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/** |
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* Get configured algorithm for TOTP Authenticator |
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* |
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* Must be one of: "sha1", "sha256", "sha512" |
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* If not specified or invalid, default to "sha1" |
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* @return string |
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*/ |
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public static function get_algorithm() |
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{ |
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$algorithm = self::config()->get('algorithm'); |
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return in_array(strtolower($algorithm), ['sha1', 'sha256', 'sha512']) |
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? $algorithm |
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: 'sha1'; |
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} |
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} |
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elliot-sawyer /
totp-authenticator
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