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22 * SAML2LogoutInitiator.cpp
24 * Triggers SP-initiated logout for SAML 2.0 sessions.
28 #include "exceptions.h"
29 #include "Application.h"
30 #include "ServiceProvider.h"
31 #include "SessionCache.h"
32 #include "handler/AbstractHandler.h"
33 #include "handler/LogoutInitiator.h"
36 # include "binding/SOAPClient.h"
37 # include "metadata/MetadataProviderCriteria.h"
38 # include "security/SecurityPolicy.h"
39 # include <boost/algorithm/string.hpp>
40 # include <boost/iterator/indirect_iterator.hpp>
41 # include <saml/exceptions.h>
42 # include <saml/SAMLConfig.h>
43 # include <saml/saml2/core/Protocols.h>
44 # include <saml/saml2/binding/SAML2SOAPClient.h>
45 # include <saml/saml2/metadata/EndpointManager.h>
46 # include <saml/saml2/metadata/Metadata.h>
47 # include <saml/saml2/metadata/MetadataCredentialCriteria.h>
48 using namespace opensaml::saml2;
49 using namespace opensaml::saml2p;
50 using namespace opensaml::saml2md;
51 using namespace opensaml;
53 # include "lite/SAMLConstants.h"
56 using namespace shibsp;
57 using namespace xmltooling;
58 using namespace boost;
63 #if defined (_MSC_VER)
64 #pragma warning( push )
65 #pragma warning( disable : 4250 )
68 class SHIBSP_DLLLOCAL SAML2LogoutInitiator : public AbstractHandler, public LogoutInitiator
71 SAML2LogoutInitiator(const DOMElement* e, const char* appId);
72 virtual ~SAML2LogoutInitiator() {}
74 void init(const char* location); // encapsulates actions that need to run either in the c'tor or setParent
76 void setParent(const PropertySet* parent);
77 void receive(DDF& in, ostream& out);
78 pair<bool,long> run(SPRequest& request, bool isHandler=true) const;
80 const XMLCh* getProtocolFamily() const {
81 return samlconstants::SAML20P_NS;
85 pair<bool,long> doRequest(
86 const Application& application, const HTTPRequest& request, HTTPResponse& httpResponse, Session* session
91 auto_ptr<LogoutRequest> buildRequest(
92 const Application& application, const Session& session, const RoleDescriptor& role, const MessageEncoder* encoder=nullptr
95 LogoutEvent* newLogoutEvent(
96 const Application& application, const HTTPRequest* request=nullptr, const Session* session=nullptr
98 LogoutEvent* e = LogoutHandler::newLogoutEvent(application, request, session);
100 e->m_protocol = m_protocol.get();
105 vector<string> m_bindings;
106 map< string,boost::shared_ptr<MessageEncoder> > m_encoders;
108 auto_ptr_char m_protocol;
111 #if defined (_MSC_VER)
112 #pragma warning( pop )
115 Handler* SHIBSP_DLLLOCAL SAML2LogoutInitiatorFactory(const pair<const DOMElement*,const char*>& p)
117 return new SAML2LogoutInitiator(p.first, p.second);
121 SAML2LogoutInitiator::SAML2LogoutInitiator(const DOMElement* e, const char* appId)
122 : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT".LogoutInitiator.SAML2")), m_appId(appId), m_protocol(samlconstants::SAML20P_NS)
127 // If Location isn't set, defer initialization until the setParent call.
128 pair<bool,const char*> loc = getString("Location");
134 void SAML2LogoutInitiator::setParent(const PropertySet* parent)
136 DOMPropertySet::setParent(parent);
137 pair<bool,const char*> loc = getString("Location");
141 void SAML2LogoutInitiator::init(const char* location)
144 string address = m_appId + location + "::run::SAML2LI";
145 setAddress(address.c_str());
148 m_log.warn("no Location property in SAML2 LogoutInitiator (or parent), can't register as remoted handler");
152 if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
153 pair<bool,bool> async = getBool("asynchronous");
154 m_async = !async.first || async.second;
157 pair<bool,const char*> outgoing = getString("outgoingBindings");
158 if (outgoing.first) {
159 dupBindings = outgoing.second;
162 // No override, so we'll install a default binding precedence.
163 dupBindings = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
164 samlconstants::SAML20_BINDING_HTTP_POST_SIMPLESIGN + ' ' + samlconstants::SAML20_BINDING_HTTP_ARTIFACT;
166 split(m_bindings, dupBindings, is_space(), algorithm::token_compress_on);
167 for (vector<string>::const_iterator b = m_bindings.begin(); b != m_bindings.end(); ++b) {
169 boost::shared_ptr<MessageEncoder> encoder(
170 SAMLConfig::getConfig().MessageEncoderManager.newPlugin(*b, pair<const DOMElement*,const XMLCh*>(getElement(),nullptr))
172 if (encoder->isUserAgentPresent() && XMLString::equals(getProtocolFamily(), encoder->getProtocolFamily())) {
173 m_encoders[*b] = encoder;
174 m_log.debug("supporting outgoing binding (%s)", b->c_str());
177 m_log.warn("skipping outgoing binding (%s), not a SAML 2.0 front-channel mechanism", b->c_str());
180 catch (std::exception& ex) {
181 m_log.error("error building MessageEncoder: %s", ex.what());
189 pair<bool,long> SAML2LogoutInitiator::run(SPRequest& request, bool isHandler) const
191 // Defer to base class for front-channel loop first.
192 pair<bool,long> ret = LogoutHandler::run(request, isHandler);
196 // At this point we know the front-channel is handled.
197 // We need the session to do any other work.
199 Session* session = nullptr;
201 session = request.getSession(false, true, false); // don't cache it and ignore all checks
203 return make_pair(false, 0L);
205 // We only handle SAML 2.0 sessions.
206 if (!XMLString::equals(session->getProtocol(), m_protocol.get())) {
208 return make_pair(false, 0L);
211 catch (std::exception& ex) {
212 m_log.error("error accessing current session: %s", ex.what());
213 return make_pair(false, 0L);
216 if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
217 // When out of process, we run natively.
218 return doRequest(request.getApplication(), request, request, session);
221 // When not out of process, we remote the request.
223 vector<string> headers(1,"Cookie");
224 DDF out,in = wrap(request,&headers);
225 DDFJanitor jin(in), jout(out);
226 out=request.getServiceProvider().getListenerService()->send(in);
227 return unwrap(request, out);
231 void SAML2LogoutInitiator::receive(DDF& in, ostream& out)
234 // Defer to base class for notifications
235 if (in["notify"].integer() == 1)
236 return LogoutHandler::receive(in, out);
239 const char* aid=in["application_id"].string();
240 const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : nullptr;
242 // Something's horribly wrong.
243 m_log.error("couldn't find application (%s) for logout", aid ? aid : "(missing)");
244 throw ConfigurationException("Unable to locate application for logout, deleted?");
247 // Unpack the request.
248 scoped_ptr<HTTPRequest> req(getRequest(in));
250 // Set up a response shim.
252 DDFJanitor jout(ret);
253 scoped_ptr<HTTPResponse> resp(getResponse(ret));
255 Session* session = nullptr;
257 session = app->getServiceProvider().getSessionCache()->find(*app, *req, nullptr, nullptr);
259 catch (std::exception& ex) {
260 m_log.error("error accessing current session: %s", ex.what());
263 // With no session, we just skip the request and let it fall through to an empty struct return.
265 if (session->getNameID() && session->getEntityID()) {
266 // Since we're remoted, the result should either be a throw, which we pass on,
267 // a false/0 return, which we just return as an empty structure, or a response/redirect,
268 // which we capture in the facade and send back.
269 doRequest(*app, *req, *resp, session);
273 m_log.log(getParent() ? Priority::WARN : Priority::ERROR, "bypassing SAML 2.0 logout, no NameID or issuing entityID found in session");
274 app->getServiceProvider().getSessionCache()->remove(*app, *req, resp.get());
279 throw ConfigurationException("Cannot perform logout using lite version of shibsp library.");
283 pair<bool,long> SAML2LogoutInitiator::doRequest(
284 const Application& application, const HTTPRequest& httpRequest, HTTPResponse& httpResponse, Session* session
287 Locker sessionLocker(session, false);
289 scoped_ptr<LogoutEvent> logout_event(newLogoutEvent(application, &httpRequest, session));
292 // Do back channel notification.
293 vector<string> sessions(1, session->getID());
294 if (!notifyBackChannel(application, httpRequest.getRequestURL(), sessions, false)) {
297 logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_PARTIAL;
298 application.getServiceProvider().getTransactionLog()->write(*logout_event);
301 sessionLocker.assign();
303 application.getServiceProvider().getSessionCache()->remove(application, httpRequest, &httpResponse);
304 return sendLogoutPage(application, httpRequest, httpResponse, "partial");
308 pair<bool,long> ret = make_pair(false, 0L);
310 // With a session in hand, we can create a LogoutRequest message, if we can find a compatible endpoint.
311 MetadataProvider* m = application.getMetadataProvider();
312 Locker metadataLocker(m);
313 MetadataProviderCriteria mc(application, session->getEntityID(), &IDPSSODescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS);
314 pair<const EntityDescriptor*,const RoleDescriptor*> entity = m->getEntityDescriptor(mc);
316 throw MetadataException(
317 "Unable to locate metadata for identity provider ($entityID)", namedparams(1, "entityID", session->getEntityID())
320 else if (!entity.second) {
321 throw MetadataException(
322 "Unable to locate SAML 2.0 IdP role for identity provider ($entityID).", namedparams(1, "entityID", session->getEntityID())
326 const IDPSSODescriptor* role = dynamic_cast<const IDPSSODescriptor*>(entity.second);
327 if (role->getSingleLogoutServices().empty()) {
328 throw MetadataException(
329 "No SingleLogoutService endpoints in metadata for identity provider ($entityID).", namedparams(1, "entityID", session->getEntityID())
333 const EndpointType* ep = nullptr;
334 const MessageEncoder* encoder = nullptr;
335 for (vector<string>::const_iterator b = m_bindings.begin(); b != m_bindings.end(); ++b) {
336 auto_ptr_XMLCh wideb(b->c_str());
337 if (ep = EndpointManager<SingleLogoutService>(role->getSingleLogoutServices()).getByBinding(wideb.get())) {
338 map< string,boost::shared_ptr<MessageEncoder> >::const_iterator enc = m_encoders.find(*b);
339 if (enc != m_encoders.end())
340 encoder = enc->second.get();
344 if (!ep || !encoder) {
345 m_log.debug("no compatible front channel SingleLogoutService, trying back channel...");
346 shibsp::SecurityPolicy policy(application);
347 shibsp::SOAPClient soaper(policy);
348 MetadataCredentialCriteria mcc(*role);
350 LogoutResponse* logoutResponse = nullptr;
351 scoped_ptr<StatusResponseType> srt;
352 auto_ptr_XMLCh binding(samlconstants::SAML20_BINDING_SOAP);
353 const vector<SingleLogoutService*>& endpoints = role->getSingleLogoutServices();
354 for (indirect_iterator<vector<SingleLogoutService*>::const_iterator> epit = make_indirect_iterator(endpoints.begin());
355 !logoutResponse && epit != make_indirect_iterator(endpoints.end()); ++epit) {
357 if (!XMLString::equals(epit->getBinding(), binding.get()))
359 auto_ptr<LogoutRequest> msg(buildRequest(application, *session, *role));
363 logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_UNKNOWN;
364 logout_event->m_saml2Request = msg.get();
365 application.getServiceProvider().getTransactionLog()->write(*logout_event);
366 logout_event->m_saml2Request = nullptr;
369 auto_ptr_char dest(epit->getLocation());
370 SAML2SOAPClient client(soaper, false);
371 client.sendSAML(msg.release(), application.getId(), mcc, dest.get());
372 srt.reset(client.receiveSAML());
373 if (!(logoutResponse = dynamic_cast<LogoutResponse*>(srt.get()))) {
377 catch (std::exception& ex) {
378 m_log.error("error sending LogoutRequest message: %s", ex.what());
384 if (!logoutResponse) {
385 if (endpoints.empty())
386 m_log.info("IdP doesn't support single logout protocol over a compatible binding");
388 m_log.warn("IdP didn't respond to logout request");
390 // Log the end result.
392 logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_PARTIAL;
393 application.getServiceProvider().getTransactionLog()->write(*logout_event);
396 ret = sendLogoutPage(application, httpRequest, httpResponse, "partial");
399 // Check the status, looking for non-success or a partial logout code.
400 const StatusCode* sc = logoutResponse->getStatus() ? logoutResponse->getStatus()->getStatusCode() : nullptr;
401 bool partial = (!sc || !XMLString::equals(sc->getValue(), StatusCode::SUCCESS));
402 if (!partial && sc->getStatusCode()) {
403 // Success, but still need to check for partial.
404 partial = XMLString::equals(sc->getStatusCode()->getValue(), StatusCode::PARTIAL_LOGOUT);
407 // Log the end result.
409 logout_event->m_logoutType = partial ? LogoutEvent::LOGOUT_EVENT_PARTIAL : LogoutEvent::LOGOUT_EVENT_GLOBAL;
410 logout_event->m_saml2Response = logoutResponse;
411 application.getServiceProvider().getTransactionLog()->write(*logout_event);
415 ret = sendLogoutPage(application, httpRequest, httpResponse, "partial");
417 const char* returnloc = httpRequest.getParameter("return");
419 // Relative URLs get promoted, absolutes get validated.
420 if (*returnloc == '/') {
421 string loc(returnloc);
422 httpRequest.absolutize(loc);
423 ret.second = httpResponse.sendRedirect(loc.c_str());
426 application.limitRedirect(httpRequest, returnloc);
427 ret.second = httpResponse.sendRedirect(returnloc);
432 ret = sendLogoutPage(application, httpRequest, httpResponse, "global");
438 sessionLocker.assign();
440 application.getServiceProvider().getSessionCache()->remove(application, httpRequest, &httpResponse);
446 // Save off return location as RelayState.
448 const char* returnloc = httpRequest.getParameter("return");
450 application.limitRedirect(httpRequest, returnloc);
451 relayState = returnloc;
452 httpRequest.absolutize(relayState);
453 cleanRelayState(application, httpRequest, httpResponse);
454 preserveRelayState(application, httpResponse, relayState);
457 auto_ptr<LogoutRequest> msg(buildRequest(application, *session, *role, encoder));
458 msg->setDestination(ep->getLocation());
462 logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_UNKNOWN;
463 logout_event->m_saml2Request = msg.get();
464 application.getServiceProvider().getTransactionLog()->write(*logout_event);
467 auto_ptr_char dest(ep->getLocation());
468 ret.second = sendMessage(*encoder, msg.get(), relayState.c_str(), dest.get(), role, application, httpResponse, true);
470 msg.release(); // freed by encoder
473 sessionLocker.assign();
475 application.getServiceProvider().getSessionCache()->remove(application, httpRequest, &httpResponse);
478 catch (MetadataException& mex) {
479 // Less noise for IdPs that don't support logout (i.e. most)
480 m_log.info("unable to issue SAML 2.0 logout request: %s", mex.what());
482 catch (std::exception& ex) {
483 m_log.error("error issuing SAML 2.0 logout request: %s", ex.what());
488 throw ConfigurationException("Cannot perform logout using lite version of shibsp library.");
494 auto_ptr<LogoutRequest> SAML2LogoutInitiator::buildRequest(
495 const Application& application, const Session& session, const RoleDescriptor& role, const MessageEncoder* encoder
498 const PropertySet* relyingParty = application.getRelyingParty(dynamic_cast<EntityDescriptor*>(role.getParent()));
500 auto_ptr<LogoutRequest> msg(LogoutRequestBuilder::buildLogoutRequest());
501 Issuer* issuer = IssuerBuilder::buildIssuer();
502 msg->setIssuer(issuer);
503 issuer->setName(relyingParty->getXMLString("entityID").second);
504 auto_ptr_XMLCh index(session.getSessionIndex());
505 if (index.get() && *index.get()) {
506 SessionIndex* si = SessionIndexBuilder::buildSessionIndex();
507 msg->getSessionIndexs().push_back(si);
508 si->setSessionIndex(index.get());
511 const NameID* nameid = session.getNameID();
512 pair<bool,const char*> flag = relyingParty->getString("encryption");
514 (!strcmp(flag.second, "true") || (encoder && !strcmp(flag.second, "front")) || (!encoder && !strcmp(flag.second, "back")))) {
515 auto_ptr<EncryptedID> encrypted(EncryptedIDBuilder::buildEncryptedID());
516 MetadataCredentialCriteria mcc(role);
519 *(application.getMetadataProvider()),
521 encoder ? encoder->isCompact() : false,
522 relyingParty->getXMLString("encryptionAlg").second
524 msg->setEncryptedID(encrypted.get());
528 msg->setNameID(nameid->cloneNameID());
531 XMLCh* msgid = SAMLConfig::getConfig().generateIdentifier();
533 XMLString::release(&msgid);
534 msg->setIssueInstant(time(nullptr));
536 if (m_async && encoder) {
537 msg->setExtensions(saml2p::ExtensionsBuilder::buildExtensions());
538 msg->getExtensions()->getUnknownXMLObjects().push_back(AsynchronousBuilder::buildAsynchronous());