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<?php
class sspmod_adfs_IdP_ADFS {
public static function receiveAuthnRequest(SimpleSAML_IdP $idp) {
try {
// accomodate for disfunctional $_GET "windows" slash decoding in PHP
$wctx = $_GET['wctx'];
foreach (explode('&', $_SERVER['REQUEST_URI']) as $e) {
$a = explode('=', $e);
if ($a[0] == 'wctx') $wctx = urldecode($a[1]);
}
$requestid = $wctx;
$issuer = $_GET['wtrealm'];
$requestcache = array(
'RequestID' => $requestid,
'Issuer' => $issuer,
'RelayState' => $requestid
);
$spEntityId = $requestcache['Issuer'];
$metadata = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
$spMetadata = $metadata->getMetaDataConfig($spEntityId, 'adfs-sp-remote');
SimpleSAML_Logger::info('ADFS - IdP.prp: Incoming Authentication request: '.$issuer.' id '.$requestid);
} catch(Exception $exception) {
throw new SimpleSAML_Error_Error('PROCESSAUTHNREQUEST', $exception);
}
$sessionLostURL = NULL; // TODO?
$forceAuthn = FALSE;
$isPassive = FALSE;
$state = array(
'Responder' => array('sspmod_adfs_IdP_ADFS', 'sendResponse'),
// SimpleSAML_Auth_State::EXCEPTION_HANDLER_FUNC => array('sspmod_adfs_IdP', 'handleAuthError'),
// SimpleSAML_Auth_State::RESTART => $sessionLostURL,
'SPMetadata' => $spMetadata->toArray(),
'ForceAuthn' => $forceAuthn,
'isPassive' => $isPassive,
'adfs:wctx' => $wctx,
);
$idp->handleAuthenticationRequest($state);
}
public static function ADFS_GenerateResponse($issuer, $target, $nameid, $attributes) {
#$nameid = 'hans@surfnet.nl';
$issueInstant = SimpleSAML_Utilities::generateTimestamp();
$notBefore = SimpleSAML_Utilities::generateTimestamp(time() - 30);
$assertionExpire = SimpleSAML_Utilities::generateTimestamp(time() + 60 * 5);
$assertionID = SimpleSAML_Utilities::generateID();
$nameidFormat = 'http://schemas.xmlsoap.org/claims/UPN';
$result =
'<wst:RequestSecurityTokenResponse xmlns:wst="http://schemas.xmlsoap.org/ws/2005/02/trust">
<wst:RequestedSecurityToken>
<saml:Assertion Issuer="' . $issuer . '" IssueInstant="' . $issueInstant . '" AssertionID="' . $assertionID . '" MinorVersion="1" MajorVersion="1" xmlns:saml="urn:oasis:names:tc:SAML:1.0:assertion">
<saml:Conditions NotOnOrAfter="' . $assertionExpire . '" NotBefore="' . $notBefore . '">
<saml:AudienceRestrictionCondition>
<saml:Audience>' . $target .'</saml:Audience>
</saml:AudienceRestrictionCondition>
</saml:Conditions>
<saml:AuthenticationStatement AuthenticationMethod="urn:oasis:names:tc:SAML:1.0:am:unspecified" AuthenticationInstant="' . $issueInstant . '">
<saml:Subject>
<saml:NameIdentifier Format="' . $nameidFormat . '">' . htmlspecialchars($nameid) . '</saml:NameIdentifier>
</saml:Subject>
</saml:AuthenticationStatement>
<saml:AttributeStatement>
<saml:Subject>
<saml:NameIdentifier Format="' . $nameidFormat . '">' . htmlspecialchars($nameid) . '</saml:NameIdentifier>
</saml:Subject>';
foreach ($attributes as $name => $values) {
if ((!is_array($values)) || (count($values) == 0)) continue;
$hasValue = FALSE;
$r = '<saml:Attribute AttributeNamespace="http://schemas.xmlsoap.org/claims" AttributeName="' . htmlspecialchars($name) .'">';
foreach ($values as $value) {
if ( (!isset($value)) or ($value === '')) continue;
$r .= '<saml:AttributeValue>' . htmlspecialchars($value) . '</saml:AttributeValue>';
$hasValue = TRUE;
}
$r .= '</saml:Attribute>';
if ($hasValue) $result .= $r;
}
$result .= '
</saml:AttributeStatement>
</saml:Assertion>
</wst:RequestedSecurityToken>
<wsp:AppliesTo xmlns:wsp="http://schemas.xmlsoap.org/ws/2004/09/policy"><wsa:EndpointReference xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing">
<wsa:Address>' . $target . '</wsa:Address>
</wsa:EndpointReference></wsp:AppliesTo>
</wst:RequestSecurityTokenResponse>';
return $result;
}
public static function ADFS_SignResponse($response, $key, $cert) {
$objXMLSecDSig = new XMLSecurityDSig();
$objXMLSecDSig->idKeys = array('AssertionID');
$objXMLSecDSig->setCanonicalMethod(XMLSecurityDSig::EXC_C14N);
$responsedom = new DOMDocument();
$responsedom->loadXML(str_replace ("\r", "", $response));
$firstassertionroot = $responsedom->getElementsByTagName('Assertion')->item(0);
$objXMLSecDSig->addReferenceList(array($firstassertionroot), XMLSecurityDSig::SHA1,
array('http://www.w3.org/2000/09/xmldsig#enveloped-signature', XMLSecurityDSig::EXC_C14N),
array('id_name' => 'AssertionID'));
$objKey = new XMLSecurityKey(XMLSecurityKey::RSA_SHA1, array('type'=>'private'));
$objKey->loadKey($key, TRUE);
$objXMLSecDSig->sign($objKey);
if ($cert) {
$public_cert = file_get_contents($cert);
$objXMLSecDSig->add509Cert($public_cert, TRUE);
}
$newSig = $responsedom->importNode($objXMLSecDSig->sigNode, TRUE);
$firstassertionroot->appendChild($newSig);
return $responsedom->saveXML();
}
public static function ADFS_PostResponse($url, $wresult, $wctx) {
print '
<body onload="document.forms[0].submit()"><form method="post" action="' . $url . '">
<input type="hidden" name="wa" value="wsignin1.0">
<input type="hidden" name="wresult" value="' . htmlspecialchars($wresult) . '">
<input type="hidden" name="wctx" value="' . htmlspecialchars($wctx) . '">
<noscript><input type="submit" value="Continue"></noscript>
</form></body>';
exit;
}
public static function sendResponse(array $state) {
$spMetadata = $state["SPMetadata"];
$spEntityId = $spMetadata['entityid'];
$spMetadata = SimpleSAML_Configuration::loadFromArray($spMetadata,
'$metadata[' . var_export($spEntityId, TRUE) . ']');
$attributes = $state['Attributes'];
$nameidattribute = $spMetadata->getValue('simplesaml.nameidattribute');
if (!empty($nameidattribute)) {
if (!array_key_exists($nameidattribute, $attributes)) {
throw new Exception('simplesaml.nameidattribute does not exist in resulting attribute set');
}
$nameid = $attributes[$nameidattribute][0];
} else {
$nameid = SimpleSAML_Utilities::generateID();
}
$idp = SimpleSAML_IdP::getByState($state);
$idpMetadata = $idp->getConfig();
$idpEntityId = $idpMetadata->getString('entityid');
$idp->addAssociation(array(
'id' => 'adfs:' . $spEntityId,
'Handler' => 'sspmod_adfs_IdP_ADFS',
'adfs:entityID' => $spEntityId,
));
$response = sspmod_adfs_IdP_ADFS::ADFS_GenerateResponse($idpEntityId, $spEntityId, $nameid, $attributes);
$privateKeyFile = SimpleSAML_Utilities::resolveCert($idpMetadata->getString('privatekey'));
$certificateFile = SimpleSAML_Utilities::resolveCert($idpMetadata->getString('certificate'));
$wresult = sspmod_adfs_IdP_ADFS::ADFS_SignResponse($response, $privateKeyFile, $certificateFile);
$wctx = $state['adfs:wctx'];
sspmod_adfs_IdP_ADFS::ADFS_PostResponse($spMetadata->getValue('prp'), $wresult, $wctx);
}
/*
public static function handleAuthError(SimpleSAML_Error_Exception $exception, array $state) {
}
*/
public static function sendLogoutResponse(SimpleSAML_IdP $idp, array $state) {
// NB:: we don't know from which SP the logout request came from
$metadata = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
$idpMetadata = $idp->getConfig();
SimpleSAML_Utilities::redirectTrustedURL($idpMetadata->getValue('redirect-after-logout', SimpleSAML_Utilities::getBaseURL()));
}
public static function receiveLogoutMessage(SimpleSAML_IdP $idp) {
// if a redirect is to occur based on wreply, we will redirect to url as
// this implies an override to normal sp notification.
if(isset($_GET['wreply']) && !empty($_GET['wreply'])) {
$idp->doLogoutRedirect(SimpleSAML_Utilities::checkURLAllowed($_GET['wreply']));
assert(FALSE);
}
$state = array(
'Responder' => array('sspmod_adfs_IdP_ADFS', 'sendLogoutResponse'),
);
//$spEntityId = NULL;
//$assocId = 'adfs:' . $spEntityId;
$assocId = NULL;
// TODO: verify that this is really no problem for:
// a) SSP, because there's no caller SP...
// b) ADFS SP because caller will be called back...
$idp->handleLogoutRequest($state, $assocId);
}
// accepts an association array, and returns a URL that can be accessed to terminate the association.
public static function getLogoutURL(SimpleSAML_IdP $idp, array $association, $relayState) {
$metadata = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
$idpMetadata = $idp->getConfig();
$spMetadata = $metadata->getMetaDataConfig($association['adfs:entityID'], 'adfs-sp-remote');
// 'https://adfs-test.showcase.surfnet.nl/adfs/ls/?wa=wsignoutcleanup1.0&wreply=https%3A%2F%2Flocalhost%2Fsimplesaml');
$returnTo = SimpleSAML_Module::getModuleURL('adfs/idp/prp.php?assocId=' . urlencode($association["id"]) . '&relayState=' . urlencode($relayState));
return $spMetadata->getValue('prp') . '?' . 'wa=wsignoutcleanup1.0&wreply=' . urlencode($returnTo);
}
}
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