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<?php |
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/** |
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* SMS Authentication Processing filter |
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* |
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* Filter for requesting the user's SMS-based OTP. |
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* |
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* @package tvdijen/simplesamlphp-module-cmdotcom |
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*/ |
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declare(strict_types=1); |
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namespace SimpleSAML\Module\cmdotcom\Auth\Process; |
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use RuntimeException; |
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use SAML2\Constants; |
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use SimpleSAML\{Auth, Configuration, Logger, Module, Utils}; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\HTTP\RunnableResponse; |
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use SimpleSAML\Module\cmdotcom\Utils\PhoneNumber as PhoneNumberUtils; |
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use SimpleSAML\Module\saml\Error; |
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use UnexpectedValueException; |
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class OTP extends Auth\ProcessingFilter |
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{ |
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// The REST API key for the cm.com SMS service (also called Product Token) |
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private ?string $productToken = null; |
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// The originator for the SMS |
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private string $originator = 'Example'; |
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// The attribute containing the user's mobile phone number |
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private string $mobilePhoneAttribute = 'mobile'; |
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// The number of seconds an SMS-code can be used for authentication |
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private int $validFor = 180; |
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// The number digits to use for the OTP between 4 an 10 |
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private int $codeLength = 5; |
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// Whether or not the OTP-code should be pushed to an app on the device |
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private bool $allowPush = false; |
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// The app key to be used when allowPush is set to true |
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private ?string $appKey = null; |
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// The default region (CLDR-format) to use when parsing recipient phone numbers |
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private string $defaultRegion = 'ZZ'; |
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/** |
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* Initialize SMS OTP filter. |
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* |
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* Validates and parses the configuration. |
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* |
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* @param array $config Configuration information. |
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* @param mixed $reserved For future use. |
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* |
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* @throws \Exception if the required REST API key is missing. |
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*/ |
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public function __construct(array $config, $reserved) |
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{ |
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parent::__construct($config, $reserved); |
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// Retrieve the mandatory product token from the configuration |
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if (isset($config['productToken'])) { |
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$this->productToken = $config['productToken']; |
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} |
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// Retrieve the optional allowPush from the configuration |
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if (isset($config['allowPush'])) { |
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$this->allowPush = $config['allowPush']; |
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} |
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// Retrieve the optional app key from the configuration |
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if (isset($config['appKey'])) { |
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$this->appKey = $config['appKey']; |
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} |
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// Retrieve the optional originator from the configuration |
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if (isset($config['originator'])) { |
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$this->originator = $config['originator']; |
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} |
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// Retrieve the optional code length from the configuration |
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if (isset($config['codeLength'])) { |
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$this->codeLength = $config['codeLength']; |
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} |
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// Retrieve the optional attribute name that holds the mobile phone number |
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if (isset($config['mobilePhoneAttribute'])) { |
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$this->mobilePhoneAttribute = $config['mobilePhoneAttribute']; |
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} |
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// Retrieve the optional validFor |
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if (isset($config['validFor'])) { |
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$this->validFor = $config['validFor']; |
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} |
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// Retrieve the optional defaultRegion |
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if (isset($config['defaultRegion'])) { |
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$this->defaultRegion = $config['defaultRegion']; |
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} |
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Assert::notEmpty( |
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$this->mobilePhoneAttribute, |
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'mobilePhoneAttribute cannot be an empty string.', |
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); |
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} |
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/** |
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* Process a authentication response |
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* |
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* This function saves the state, and redirects the user to the page where the user can enter the OTP |
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* code sent to them. |
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* |
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* @param array &$state The state of the response. |
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*/ |
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public function process(array &$state): void |
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{ |
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// user interaction necessary. Throw exception on isPassive request |
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if (isset($state['isPassive']) && $state['isPassive'] === true) { |
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throw new Error\NoPassive( |
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Constants::STATUS_REQUESTER, |
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'Unable to enter verification code on passive request.' |
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); |
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} |
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// See if we're reauthenticating |
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if (isset($state['cmdotcom:authenticated']) && $state['cmdotcom:authenticated'] === true) { |
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// Don't ask for another SMS code unless the SP forces total reauthentication |
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if (!isset($state['ForceAuthn']) || $state['ForceAuthn'] === false) { |
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Auth\ProcessingChain::resumeProcessing($state); |
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// Method above should never return |
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Assert::true(false); |
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} |
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} |
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// Retrieve the user's mobile phone number |
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$recipient = $this->getMobilePhoneAttribute($state); |
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// Sanitize the user's mobile phone number |
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$phoneNumberUtils = new PhoneNumberUtils(); |
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$recipient = $phoneNumberUtils->sanitizePhoneNumber($recipient, $this->defaultRegion); |
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$state['cmdotcom:productToken'] = $this->productToken; |
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$state['cmdotcom:originator'] = $this->originator; |
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$state['cmdotcom:recipient'] = $recipient; |
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$state['cmdotcom:validFor'] = $this->validFor; |
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$state['cmdotcom:codeLength'] = $this->codeLength; |
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$state['cmdotcom:allowPush'] = $this->allowPush; |
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if ($this->allowPush === true) { |
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$state['cmdotcom:appKey'] = $this->appKey; |
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} |
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// Save state and redirect |
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$id = Auth\State::saveState($state, 'cmdotcom:request'); |
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$url = Module::getModuleURL('cmdotcom/sendCode'); |
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$httpUtils = new Utils\HTTP(); |
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$httpUtils->redirectTrustedURL($url, ['AuthState' => $id]); |
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} |
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/** |
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* Retrieve the mobile phone attribute from the state |
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* |
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* @param array $state |
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* @return string |
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* @throws \RuntimeException if no attribute with a mobile phone number is present. |
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*/ |
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protected function getMobilePhoneAttribute(array $state): string |
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{ |
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Assert::keyExists($state, 'Attributes'); |
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Assert::keyExists( |
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$state['Attributes'], |
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$this->mobilePhoneAttribute, |
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sprintf( |
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"cmdotcom:OTP: Missing attribute '%s', which is needed to send an SMS.", |
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$this->mobilePhoneAttribute, |
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), |
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); |
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return $state['Attributes'][$this->mobilePhoneAttribute][0]; |
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} |
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} |
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tvdijen /
simplesamlphp-module-cmdotcom
