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<?php |
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/** |
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* Class SAMLController |
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* |
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* This controller handles serving metadata requests for the IdP, as well as handling |
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* creating new users and logging them into SilverStripe after being authenticated at the IdP. |
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*/ |
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class SAMLController extends Controller |
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{ |
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/** |
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* @var array |
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*/ |
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private static $allowed_actions = [ |
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'index', |
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'login', |
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'logout', |
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'acs', |
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'sls', |
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'metadata' |
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]; |
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/** |
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* Assertion Consumer Service |
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* |
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* The user gets sent back here after authenticating with the IdP, off-site. |
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* The earlier redirection to the IdP can be found in the SAMLAuthenticator::authenticate. |
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* |
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* After this handler completes, we end up with a rudimentary Member record (which will be created on-the-fly |
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* if not existent), with the user already logged in. Login triggers memberLoggedIn hooks, which allows |
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* LDAP side of this module to finish off loading Member data. |
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* |
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* @throws OneLogin_Saml2_Error |
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*/ |
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public function acs() |
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{ |
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$auth = Injector::inst()->get('SAMLHelper')->getSAMLAuth(); |
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$auth->processResponse(); |
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$error = $auth->getLastErrorReason(); |
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if (!empty($error)) { |
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SS_Log::log($error, SS_Log::ERR); |
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Form::messageForForm("SAMLLoginForm_LoginForm", "Authentication error: '{$error}'", 'bad'); |
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Session::save(); |
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return $this->getRedirect(); |
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} |
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if (!$auth->isAuthenticated()) { |
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Form::messageForForm("SAMLLoginForm_LoginForm", _t('Member.ERRORWRONGCRED'), 'bad'); |
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Session::save(); |
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return $this->getRedirect(); |
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} |
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$decodedNameId = base64_decode($auth->getNameId()); |
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// check that the NameID is a binary string (which signals that it is a guid |
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if (ctype_print($decodedNameId)) { |
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Form::messageForForm("SAMLLoginForm_LoginForm", "Name ID provided by IdP is not a binary GUID.", 'bad'); |
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Session::save(); |
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return $this->getRedirect(); |
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} |
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// transform the NameId to guid |
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$guid = LDAPUtil::bin_to_str_guid($decodedNameId); |
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if (!LDAPUtil::validGuid($guid)) { |
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$errorMessage = "Not a valid GUID '{$guid}' recieved from server."; |
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SS_Log::log($errorMessage, SS_Log::ERR); |
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Form::messageForForm("SAMLLoginForm_LoginForm", $errorMessage, 'bad'); |
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Session::save(); |
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return $this->getRedirect(); |
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} |
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// Write a rudimentary member with basic fields on every login, so that we at least have something |
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// if LDAP synchronisation fails. |
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$member = Member::get()->filter('GUID', $guid)->limit(1)->first(); |
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if (!($member && $member->exists())) { |
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$member = new Member(); |
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$member->GUID = $guid; |
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} |
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$attributes = $auth->getAttributes(); |
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foreach ($member->config()->claims_field_mappings as $claim => $field) { |
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if (!isset($attributes[$claim][0])) { |
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SS_Log::log( |
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sprintf( |
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'Claim rule \'%s\' configured in LDAPMember.claims_field_mappings, but wasn\'t passed through. Please check IdP claim rules.', |
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$claim |
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), SS_Log::WARN |
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); |
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continue; |
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} |
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if(count($attributes[$claim]) > 1) { |
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$member->$field = $attributes[$claim]; |
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} else { |
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$member->$field = $attributes[$claim][0]; |
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} |
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} |
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$member->SAMLSessionIndex = $auth->getSessionIndex(); |
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// This will trigger LDAP update through LDAPMemberExtension::memberLoggedIn. |
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// The LDAP update will also write the Member record. We shouldn't write before |
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// calling this, as any onAfterWrite hooks that attempt to update LDAP won't |
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// have the Username field available yet for new Member records, and fail. |
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// Both SAML and LDAP identify Members by the GUID field. |
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$member->logIn(); |
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return $this->getRedirect(); |
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} |
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/** |
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* Generate this SP's metadata. This is needed for intialising the SP-IdP relationship. |
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* IdP is instructed to call us back here to establish the relationship. IdP may also be configured |
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* to hit this endpoint periodically during normal operation, to check the SP availability. |
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*/ |
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public function metadata() |
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{ |
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try { |
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$auth = Injector::inst()->get('SAMLHelper')->getSAMLAuth(); |
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$settings = $auth->getSettings(); |
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$metadata = $settings->getSPMetadata(); |
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$errors = $settings->validateMetadata($metadata); |
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if (empty($errors)) { |
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header('Content-Type: text/xml'); |
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echo $metadata; |
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} else { |
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throw new \OneLogin_Saml2_Error( |
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'Invalid SP metadata: ' . implode(', ', $errors), |
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\OneLogin_Saml2_Error::METADATA_SP_INVALID |
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); |
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} |
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} catch (Exception $e) { |
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SS_Log::log($e->getMessage(), SS_Log::ERR); |
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echo $e->getMessage(); |
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} |
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} |
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/** |
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* @return SS_HTTPResponse |
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*/ |
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protected function getRedirect() |
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{ |
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// Absolute redirection URLs may cause spoofing |
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View Code Duplication |
if (Session::get('BackURL') && Director::is_site_url(Session::get('BackURL'))) { |
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return $this->redirect(Session::get('BackURL')); |
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} |
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// Spoofing attack, redirect to homepage instead of spoofing url |
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View Code Duplication |
if (Session::get('BackURL') && !Director::is_site_url(Session::get('BackURL'))) { |
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return $this->redirect(Director::absoluteBaseURL()); |
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} |
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// If a default login dest has been set, redirect to that. |
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if (Security::config()->default_login_dest) { |
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return $this->redirect(Director::absoluteBaseURL() . Security::config()->default_login_dest); |
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} |
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// fallback to redirect back to home page |
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return $this->redirect(Director::absoluteBaseURL()); |
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} |
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} |
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silverstripe /
silverstripe-activedirectory
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