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<?php
namespace Office365\Runtime\Auth;
use DOMDocument;
use DOMNode;
use DOMNodeList;
use DOMXPath;
use Exception;
use Office365\Runtime\Http\Requests;
use Office365\Runtime\Http\Response;
use RuntimeException;
class SamlTokenProvider extends BaseTokenProvider
{
/**
* External Security Token Service
* @var string
*/
private static $StsUrl = 'https://login.microsoftonline.com/extSTS.srf';
/**
* RST2 URL
* @var string
*/
private static $RST2Url = 'https://login.microsoftonline.com/rst2.srf';
/**
* To Get the STS authentication url if $StsUrl request fails.
* @var string
*/
private static $RealmUrlTemplate = 'https://login.microsoftonline.com/getuserrealm.srf?login={username}&xml=1';
/**
* Form Url to submit SAML token
* @var string
*/
private static $SignInPageUrl = '/_forms/default.aspx?wa=wsignin1.0';
/**
* Boolean to determine whether the system is using Federated STS or not.
* @var
*/
protected $useFederatedSTS;
/**
* Form Url to submit SAML token if Federated STS is set.
* @var string
*/
private static $IDCRLSVCPageUrl = '/_vti_bin/idcrl.svc/';
/**
* @var string
*/
protected $authorityUrl;
public function __construct($authorityUrl)
{
$this->authorityUrl = $authorityUrl;
$this->useFederatedSTS = false;
}
/**
* @param array $parameters
* @return string
* @throws Exception
*/
public function acquireToken($parameters)
{
return $this->acquireSecurityToken($parameters['username'], $parameters['password']);
}
/**
* Acquire SharePoint Online authentication cookies
* @param mixed $token
* @return array
* @throws Exception
*/
public function acquireAuthenticationCookies($token)
{
$hostInfo = parse_url($this->authorityUrl);
$url = $hostInfo['scheme'] . '://' . $hostInfo['host'] . self::$SignInPageUrl;
if ($this->useFederatedSTS) {
$url = $hostInfo['scheme'] . '://' . $hostInfo['host'] . self::$IDCRLSVCPageUrl;
$headers = array();
$headers['User-Agent'] = '';
$headers['X-IDCRL_ACCEPTED'] = 't';
$headers['Authorization'] = 'BPOSIDCRL ' . $token;
$headers['Content-Type'] = 'application/x-www-form-urlencoded';
$response = Requests::head($url,$headers,true);
return Requests::parseCookies($response->getContent());
}
else {
$response = Requests::post($url,null,$token,true);
return Requests::parseCookies($response->getContent());
}
}
/**
* Acquire the service token from STS
*
* @param string $username
* @param string $password
* @return string
* @throws Exception
*/
protected function acquireSecurityToken($username, $password)
{
$data = $this->prepareSecurityTokenRequest($username, $password, $this->authorityUrl);
$response = Requests::post(self::$StsUrl, null, $data);
try {
return $this->processSecurityTokenResponse($response->getContent());
} catch (Exception $e) {
// Try to get the token with a federated authentication.
$response = $this->acquireSecurityTokenFromFederatedSTS($username, $password);
if(is_null($response))
throw $e;
return $this->processSecurityTokenResponse($response->getContent());
}
}
/**
* Acquire the service token from Federated STS
*
* @param string $username
* @param string $password
* @return Response
* @throws Exception
*/
protected function acquireSecurityTokenFromFederatedSTS($username, $password) {
$response = Requests::get(str_replace('{username}', $username, self::$RealmUrlTemplate),null);
$federatedStsUrl = $this->getFederatedAuthenticationInformation($response->getContent());
if ($federatedStsUrl) {
$message_id = md5(uniqid($username . '-' . time() . '-' . rand() , true));
$data = $this->prepareSecurityFederatedTokenRequest($username, $password, $message_id, $federatedStsUrl->textContent);
$headers = array();
$headers['Content-Type'] = 'application/soap+xml';
$response = Requests::post($federatedStsUrl->textContent, $headers, $data);
$samlAssertion = $this->getSamlAssertion($response->getContent());
if ($samlAssertion) {
$samlAssertion_node = $samlAssertion->item(0);
$data = $this->prepareRST2Request($samlAssertion_node);
$response = Requests::post(self::$RST2Url, $headers, $data);
$this->useFederatedSTS = TRUE;
return $response;
}
}
return null;
}
/**
* Get SAML assertion Node so it can be used within the RST2 template
* @param $payload
* @return DOMNodeList|null
*/
protected function getSamlAssertion($payload) {
$xml = new DOMDocument();
$xml->loadXML($payload);
$xpath = new DOMXPath($xml);
if ($xpath->query("//*[name()='saml:Assertion']")->length > 0) {
$nodeToken = $xpath->query("//*[name()='saml:Assertion']");
if (!empty($nodeToken)) {
return $nodeToken;
}
}
return null;
}
/**
* Retrieves the STS federated URL if any.
* @param $response
* @return DOMNode|null Federated STS Url
*/
protected function getFederatedAuthenticationInformation($response) {
if ($response) {
$xml = new DOMDocument();
$xml->loadXML($response);
$xpath = new DOMXPath($xml);
if ($xpath->query("//STSAuthURL")->length > 0) {
return $xpath->query("//STSAuthURL")->item(0);
}
}
return null;
}
/**
* Verify and extract security token from the HTTP response
* @param mixed $payload
* @return mixed BinarySecurityToken or Exception when an error is present
* @throws Exception
*/
protected function processSecurityTokenResponse($payload)
{
$xml = new DOMDocument();
$xml->loadXML($payload);
$xpath = new DOMXPath($xml);
if ($xpath->query("//wsse:BinarySecurityToken")->length > 0) {
$nodeToken = $xpath->query("//wsse:BinarySecurityToken")->item(0);
if (!empty($nodeToken)) {
return $nodeToken->nodeValue;
}
}
if ($xpath->query("//S:Fault")->length > 0) {
// Returning the full fault value in case any other response comes within the fault node.
throw new RuntimeException($xpath->query("//S:Fault")->item(0)->nodeValue);
}
throw new RuntimeException('An error occurred while obtaining a token, check your URL or credentials');
}
/**
* Construct the request body to acquire security token from STS endpoint
*
* @param string $username
* @param string $password
* @param string $address
* @return string
* @throws Exception
*/
protected function prepareSecurityTokenRequest($username, $password, $address)
{
$fileName = __DIR__ . '/xml/SAML.xml';
if (!file_exists($fileName)) {
throw new Exception("The file $fileName does not exist");
}
$template = file_get_contents($fileName);
$template = str_replace('{username}', $username, $template);
$template = str_replace('{password}', $password, $template);
$template = str_replace('{address}', $address, $template);
return $template;
}
/**
* Construct the request body to acquire security token from Federated STS endpoint (sts.yourcompany.com)
*
* @param string $username
* @param string $password
* @param string $message_uuid
* @param string $federated_sts_url
* @return string
* @throws Exception
*/
protected function prepareSecurityFederatedTokenRequest($username, $password, $message_uuid, $federated_sts_url)
{
$fileName = __DIR__ . '/xml/federatedSAML.xml';
if (!file_exists($fileName)) {
throw new Exception("The file $fileName does not exist");
}
$template = file_get_contents($fileName);
$template = str_replace('{username}', $username, $template);
$template = str_replace('{password}', $password, $template);
$template = str_replace('{federated_sts_url}', $federated_sts_url, $template);
$template = str_replace('{message_uuid}', $message_uuid, $template);
return $template;
}
/**
* Prepare the request to be sent to RST2 endpoint with the saml assertion
* @param $samlAssertion
* @return bool|mixed|string
* @throws Exception
*/
protected function prepareRST2Request($samlAssertion)
{
$fileName = __DIR__ . '/xml/RST2.xml';
if (!file_exists($fileName)) {
throw new Exception("The file $fileName does not exist");
}
$template = file_get_contents($fileName);
$xml = new DOMDocument();
$xml->loadXML($template);
$xpath = new DOMXPath($xml);
$samlAssertion = $xml->importNode($samlAssertion, true);
if ($xpath->query("//*[name()='wsse:Security']")->length > 0) {
$parentNode = $xpath->query("//wsse:Security")->item(0);
//append "saml assertion" node to <wsse:Security> node
$parentNode->appendChild($samlAssertion);
return $xml->saveXML();
}
return NULL;
}
}