shibsp/handler/impl/SAML2Logout.cpp

   1 /*
   2  *  Copyright 2001-2010 Internet2
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 /**
  18  * SAML2Logout.cpp
  19  *
  20  * Handles SAML 2.0 single logout protocol messages.
  21  */
  22
  23 #include "internal.h"
  24 #include "exceptions.h"
  25 #include "Application.h"
  26 #include "ServiceProvider.h"
  27 #include "SPRequest.h"
  28 #include "handler/AbstractHandler.h"
  29 #include "handler/LogoutHandler.h"
  30 #include "util/SPConstants.h"
  31
  32 #ifndef SHIBSP_LITE
  33 # include "SessionCacheEx.h"
  34 # include "security/SecurityPolicy.h"
  35 # include "security/SecurityPolicyProvider.h"
  36 # include "metadata/MetadataProviderCriteria.h"
  37 # include "util/TemplateParameters.h"
  38 # include <fstream>
  39 # include <saml/exceptions.h>
  40 # include <saml/SAMLConfig.h>
  41 # include <saml/saml2/core/Protocols.h>
  42 # include <saml/saml2/metadata/EndpointManager.h>
  43 # include <saml/saml2/metadata/Metadata.h>
  44 # include <saml/saml2/metadata/MetadataCredentialCriteria.h>
  45 # include <xmltooling/util/URLEncoder.h>
  46 using namespace opensaml::saml2;
  47 using namespace opensaml::saml2p;
  48 using namespace opensaml::saml2md;
  49 using namespace opensaml;
  50 #endif
  51
  52 using namespace shibsp;
  53 using namespace xmltooling;
  54 using namespace std;
  55
  56 namespace shibsp {
  57
  58 #if defined (_MSC_VER)
  59     #pragma warning( push )
  60     #pragma warning( disable : 4250 )
  61 #endif
  62
  63     class SHIBSP_DLLLOCAL SAML2Logout : public AbstractHandler, public LogoutHandler
  64     {
  65     public:
  66         SAML2Logout(const DOMElement* e, const char* appId);
  67         virtual ~SAML2Logout() {
  68 #ifndef SHIBSP_LITE
  69             if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
  70                 delete m_decoder;
  71                 XMLString::release(&m_outgoing);
  72                 for_each(m_encoders.begin(), m_encoders.end(), cleanup_pair<const XMLCh*,MessageEncoder>());
  73             }
  74 #endif
  75         }
  76
  77         void receive(DDF& in, ostream& out);
  78         pair<bool,long> run(SPRequest& request, bool isHandler=true) const;
  79
  80 #ifndef SHIBSP_LITE
  81         void generateMetadata(SPSSODescriptor& role, const char* handlerURL) const {
  82             const char* loc = getString("Location").second;
  83             string hurl(handlerURL);
  84             if (*loc != '/')
  85                 hurl += '/';
  86             hurl += loc;
  87             auto_ptr_XMLCh widen(hurl.c_str());
  88             SingleLogoutService* ep = SingleLogoutServiceBuilder::buildSingleLogoutService();
  89             ep->setLocation(widen.get());
  90             ep->setBinding(getXMLString("Binding").second);
  91             role.getSingleLogoutServices().push_back(ep);
  92             role.addSupport(samlconstants::SAML20P_NS);
  93         }
  94
  95         const char* getType() const {
  96             return "SingleLogoutService";
  97         }
  98 #endif
  99
 100     private:
 101         pair<bool,long> doRequest(const Application& application, const HTTPRequest& httpRequest, HTTPResponse& httpResponse) const;
 102
 103 #ifndef SHIBSP_LITE
 104         pair<bool,long> sendResponse(
 105             const XMLCh* requestID,
 106             const XMLCh* code,
 107             const XMLCh* subcode,
 108             const char* msg,
 109             const char* relayState,
 110             const RoleDescriptor* role,
 111             const Application& application,
 112             HTTPResponse& httpResponse,
 113             bool front
 114             ) const;
 115
 116         xmltooling::QName m_role;
 117         MessageDecoder* m_decoder;
 118         XMLCh* m_outgoing;
 119         vector<const XMLCh*> m_bindings;
 120         map<const XMLCh*,MessageEncoder*> m_encoders;
 121 #endif
 122     };
 123
 124 #if defined (_MSC_VER)
 125     #pragma warning( pop )
 126 #endif
 127
 128     Handler* SHIBSP_DLLLOCAL SAML2LogoutFactory(const pair<const DOMElement*,const char*>& p)
 129     {
 130         return new SAML2Logout(p.first, p.second);
 131     }
 132 };
 133
 134 SAML2Logout::SAML2Logout(const DOMElement* e, const char* appId)
 135     : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT".Logout.SAML2"))
 136 #ifndef SHIBSP_LITE
 137         ,m_role(samlconstants::SAML20MD_NS, IDPSSODescriptor::LOCAL_NAME), m_decoder(nullptr), m_outgoing(nullptr)
 138 #endif
 139 {
 140     m_initiator = false;
 141 #ifndef SHIBSP_LITE
 142     m_preserve.push_back("ID");
 143     m_preserve.push_back("entityID");
 144     m_preserve.push_back("RelayState");
 145
 146     if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
 147         SAMLConfig& conf = SAMLConfig::getConfig();
 148
 149         // Handle incoming binding.
 150         m_decoder = conf.MessageDecoderManager.newPlugin(
 151             getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
 152             );
 153         m_decoder->setArtifactResolver(SPConfig::getConfig().getArtifactResolver());
 154
 155         if (m_decoder->isUserAgentPresent()) {
 156             // Handle front-channel binding setup.
 157             pair<bool,const XMLCh*> outgoing = getXMLString("outgoingBindings", m_configNS.get());
 158             if (outgoing.first) {
 159                 m_outgoing = XMLString::replicate(outgoing.second);
 160                 XMLString::trim(m_outgoing);
 161             }
 162             else {
 163                 // No override, so we'll install a default binding precedence.
 164                 string prec = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
 165                     samlconstants::SAML20_BINDING_HTTP_POST_SIMPLESIGN + ' ' + samlconstants::SAML20_BINDING_HTTP_ARTIFACT;
 166                 m_outgoing = XMLString::transcode(prec.c_str());
 167             }
 168
 169             int pos;
 170             XMLCh* start = m_outgoing;
 171             while (start && *start) {
 172                 pos = XMLString::indexOf(start,chSpace);
 173                 if (pos != -1)
 174                     *(start + pos)=chNull;
 175                 m_bindings.push_back(start);
 176                 try {
 177                     auto_ptr_char b(start);
 178                     MessageEncoder * encoder = conf.MessageEncoderManager.newPlugin(
 179                         b.get(), pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
 180                         );
 181                     if (encoder->isUserAgentPresent()) {
 182                         m_encoders[start] = encoder;
 183                         m_log.debug("supporting outgoing binding (%s)", b.get());
 184                     }
 185                     else {
 186                         delete encoder;
 187                         m_log.warn("skipping outgoing binding (%s), not a front-channel mechanism", b.get());
 188                     }
 189                 }
 190                 catch (exception& ex) {
 191                     m_log.error("error building MessageEncoder: %s", ex.what());
 192                 }
 193                 if (pos != -1)
 194                     start = start + pos + 1;
 195                 else
 196                     break;
 197             }
 198         }
 199         else {
 200             MessageEncoder* encoder = conf.MessageEncoderManager.newPlugin(
 201                 getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
 202                 );
 203             m_encoders.insert(pair<const XMLCh*,MessageEncoder*>(nullptr, encoder));
 204         }
 205     }
 206 #endif
 207
 208     string address(appId);
 209     address += getString("Location").second;
 210     setAddress(address.c_str());
 211 }
 212
 213 pair<bool,long> SAML2Logout::run(SPRequest& request, bool isHandler) const
 214 {
 215     // Defer to base class for front-channel loop first.
 216     // This won't initiate the loop, only continue/end it.
 217     pair<bool,long> ret = LogoutHandler::run(request, isHandler);
 218     if (ret.first)
 219         return ret;
 220
 221     SPConfig& conf = SPConfig::getConfig();
 222     if (conf.isEnabled(SPConfig::OutOfProcess)) {
 223         // When out of process, we run natively and directly process the message.
 224         return doRequest(request.getApplication(), request, request);
 225     }
 226     else {
 227         // When not out of process, we remote all the message processing.
 228         vector<string> headers(1,"Cookie");
 229         DDF out,in = wrap(request, &headers, true);
 230         DDFJanitor jin(in), jout(out);
 231         out=request.getServiceProvider().getListenerService()->send(in);
 232         return unwrap(request, out);
 233     }
 234 }
 235
 236 void SAML2Logout::receive(DDF& in, ostream& out)
 237 {
 238     // Find application.
 239     const char* aid=in["application_id"].string();
 240     const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : nullptr;
 241     if (!app) {
 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?");
 245     }
 246
 247     // Unpack the request.
 248     auto_ptr<HTTPRequest> req(getRequest(in));
 249
 250     // Wrap a response shim.
 251     DDF ret(nullptr);
 252     DDFJanitor jout(ret);
 253     auto_ptr<HTTPResponse> resp(getResponse(ret));
 254
 255     // Since we're remoted, the result should either be a throw, which we pass on,
 256     // a false/0 return, which we just return as an empty structure, or a response/redirect,
 257     // which we capture in the facade and send back.
 258     doRequest(*app, *req.get(), *resp.get());
 259     out << ret;
 260 }
 261
 262 pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTTPRequest& request, HTTPResponse& response) const
 263 {
 264 #ifndef SHIBSP_LITE
 265     // First capture the active session ID.
 266     SessionCache* cache = application.getServiceProvider().getSessionCache();
 267     SessionCacheEx* cacheex = dynamic_cast<SessionCacheEx*>(cache);
 268     string session_id = cache->active(application, request);
 269
 270     if (!strcmp(request.getMethod(),"GET") && request.getParameter("notifying")) {
 271         // This is returning from a front-channel notification, so we have to do the back-channel and then
 272         // respond. To do that, we need state from the original request.
 273         if (!request.getParameter("entityID")) {
 274             cache->remove(application, request, &response);
 275             throw FatalProfileException("Application notification loop did not return entityID for LogoutResponse.");
 276         }
 277
 278         // Best effort on back channel and to remove the user agent's session.
 279         bool worked1 = false,worked2 = false;
 280         if (!session_id.empty()) {
 281             vector<string> sessions(1,session_id);
 282             worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 283             try {
 284                 cache->remove(application, request, &response);
 285                 worked2 = true;
 286             }
 287             catch (exception& ex) {
 288                 m_log.error("error removing session (%s): %s", session_id.c_str(), ex.what());
 289             }
 290         }
 291         else {
 292             worked1 = worked2 = true;
 293         }
 294
 295         // We need metadata to issue a response.
 296         MetadataProvider* m = application.getMetadataProvider();
 297         Locker metadataLocker(m);
 298         MetadataProviderCriteria mc(application, request.getParameter("entityID"), &IDPSSODescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS);
 299         pair<const EntityDescriptor*,const RoleDescriptor*> entity = m->getEntityDescriptor(mc);
 300         if (!entity.first) {
 301             throw MetadataException(
 302                 "Unable to locate metadata for identity provider ($entityID)", namedparams(1, "entityID", request.getParameter("entityID"))
 303                 );
 304         }
 305         else if (!entity.second) {
 306             throw MetadataException(
 307                 "Unable to locate SAML 2.0 IdP role for identity provider ($entityID).",
 308                 namedparams(1, "entityID", request.getParameter("entityID"))
 309                 );
 310         }
 311
 312         auto_ptr_XMLCh reqid(request.getParameter("ID"));
 313         if (worked1 && worked2) {
 314             // Successful LogoutResponse. Has to be front-channel or we couldn't be here.
 315             return sendResponse(
 316                 reqid.get(), StatusCode::SUCCESS, nullptr, nullptr, request.getParameter("RelayState"), entity.second, application, response, true
 317                 );
 318         }
 319
 320         return sendResponse(
 321             reqid.get(),
 322             StatusCode::RESPONDER, nullptr, "Unable to fully destroy principal's session.",
 323             request.getParameter("RelayState"),
 324             entity.second,
 325             application,
 326             response,
 327             true
 328             );
 329     }
 330
 331     // If we get here, it's an external protocol message to decode.
 332
 333     // Locate policy key.
 334     pair<bool,const char*> policyId = getString("policyId", m_configNS.get());  // namespace-qualified if inside handler element
 335     if (!policyId.first)
 336         policyId = application.getString("policyId");   // unqualified in Application(s) element
 337
 338     // Lock metadata for use by policy.
 339     Locker metadataLocker(application.getMetadataProvider());
 340
 341     // Create the policy.
 342     auto_ptr<SecurityPolicy> policy(
 343         application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, &m_role, policyId.second)
 344         );
 345
 346     // Decode the message.
 347     string relayState;
 348     auto_ptr<XMLObject> msg(m_decoder->decode(relayState, request, *policy.get()));
 349     const LogoutRequest* logoutRequest = dynamic_cast<LogoutRequest*>(msg.get());
 350     if (logoutRequest) {
 351         if (!policy->isAuthenticated())
 352             throw SecurityPolicyException("Security of LogoutRequest not established.");
 353
 354         // Message from IdP to logout one or more sessions.
 355
 356         // If this is front-channel, we have to have a session_id to use already.
 357         if (m_decoder->isUserAgentPresent() && session_id.empty()) {
 358             m_log.error("no active session");
 359             return sendResponse(
 360                 logoutRequest->getID(),
 361                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "No active session found in request.",
 362                 relayState.c_str(),
 363                 policy->getIssuerMetadata(),
 364                 application,
 365                 response,
 366                 true
 367                 );
 368         }
 369
 370         bool ownedName = false;
 371         NameID* nameid = logoutRequest->getNameID();
 372         if (!nameid) {
 373             // Check for EncryptedID.
 374             EncryptedID* encname = logoutRequest->getEncryptedID();
 375             if (encname) {
 376                 CredentialResolver* cr=application.getCredentialResolver();
 377                 if (!cr)
 378                     m_log.warn("found encrypted NameID, but no decryption credential was available");
 379                 else {
 380                     Locker credlocker(cr);
 381                     auto_ptr<MetadataCredentialCriteria> mcc(
 382                         policy->getIssuerMetadata() ? new MetadataCredentialCriteria(*policy->getIssuerMetadata()) : nullptr
 383                         );
 384                     try {
 385                         auto_ptr<XMLObject> decryptedID(
 386                             encname->decrypt(
 387                                 *cr,
 388                                 application.getRelyingParty(
 389                                     policy->getIssuerMetadata() ?
 390                                         dynamic_cast<EntityDescriptor*>(policy->getIssuerMetadata()->getParent()) :
 391                                             nullptr)->getXMLString("entityID").second,
 392                                 mcc.get()
 393                                 )
 394                             );
 395                         nameid = dynamic_cast<NameID*>(decryptedID.get());
 396                         if (nameid) {
 397                             ownedName = true;
 398                             decryptedID.release();
 399                         }
 400                     }
 401                     catch (exception& ex) {
 402                         m_log.error(ex.what());
 403                     }
 404                 }
 405             }
 406         }
 407         if (!nameid) {
 408             // No NameID, so must respond with an error.
 409             m_log.error("NameID not found in request");
 410             return sendResponse(
 411                 logoutRequest->getID(),
 412                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "NameID not found in request.",
 413                 relayState.c_str(),
 414                 policy->getIssuerMetadata(),
 415                 application,
 416                 response,
 417                 m_decoder->isUserAgentPresent()
 418                 );
 419         }
 420
 421         auto_ptr<NameID> namewrapper(ownedName ? nameid : nullptr);
 422
 423         // Suck indexes out of the request for next steps.
 424         set<string> indexes;
 425         EntityDescriptor* entity = policy->getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy->getIssuerMetadata()->getParent()) : nullptr;
 426         const vector<SessionIndex*> sindexes = logoutRequest->getSessionIndexs();
 427         for (vector<SessionIndex*>::const_iterator i = sindexes.begin(); i != sindexes.end(); ++i) {
 428             auto_ptr_char sindex((*i)->getSessionIndex());
 429             indexes.insert(sindex.get());
 430         }
 431
 432         // For a front-channel LogoutRequest, we have to match the information in the request
 433         // against the current session.
 434         if (!session_id.empty()) {
 435             if (!cache->matches(application, request, entity, *nameid, &indexes)) {
 436                 return sendResponse(
 437                     logoutRequest->getID(),
 438                     StatusCode::REQUESTER, StatusCode::REQUEST_DENIED, "Active session did not match logout request.",
 439                     relayState.c_str(),
 440                     policy->getIssuerMetadata(),
 441                     application,
 442                     response,
 443                     true
 444                     );
 445             }
 446
 447         }
 448
 449         // Now we perform "logout" by finding the matching sessions.
 450         vector<string> sessions;
 451         try {
 452             if (cacheex) {
 453                 time_t expires = logoutRequest->getNotOnOrAfter() ? logoutRequest->getNotOnOrAfterEpoch() : 0;
 454                 cacheex->logout(application, entity, *nameid, &indexes, expires, sessions);
 455                 m_log.debug("session cache returned %d sessions bound to NameID in logout request", sessions.size());
 456
 457                 // Now we actually terminate everything except for the active session,
 458                 // if this is front-channel, for notification purposes.
 459                 for (vector<string>::const_iterator sit = sessions.begin(); sit != sessions.end(); ++sit)
 460                     if (*sit != session_id)
 461                         cacheex->remove(application, sit->c_str());   // using the ID-based removal operation
 462             }
 463             else {
 464                 m_log.warn("session cache does not support extended API, can't implement indirect logout of sessions");
 465                 if (!session_id.empty())
 466                     sessions.push_back(session_id);
 467             }
 468         }
 469         catch (exception& ex) {
 470             m_log.error("error while logging out matching sessions: %s", ex.what());
 471             return sendResponse(
 472                 logoutRequest->getID(),
 473                 StatusCode::RESPONDER, nullptr, ex.what(),
 474                 relayState.c_str(),
 475                 policy->getIssuerMetadata(),
 476                 application,
 477                 response,
 478                 m_decoder->isUserAgentPresent()
 479                 );
 480         }
 481
 482         if (m_decoder->isUserAgentPresent()) {
 483             // Pass control to the first front channel notification point, if any.
 484             map<string,string> parammap;
 485             if (!relayState.empty())
 486                 parammap["RelayState"] = relayState;
 487             auto_ptr_char entityID(entity ? entity->getEntityID() : nullptr);
 488             if (entityID.get())
 489                 parammap["entityID"] = entityID.get();
 490             auto_ptr_char reqID(logoutRequest->getID());
 491             if (reqID.get())
 492                 parammap["ID"] = reqID.get();
 493             pair<bool,long> result = notifyFrontChannel(application, request, response, &parammap);
 494             if (result.first)
 495                 return result;
 496         }
 497
 498         // For back-channel requests, or if no front-channel notification is needed...
 499         bool worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 500         bool worked2 = true;
 501         if (!session_id.empty()) {
 502             // One last session to yoink...
 503             try {
 504                 cache->remove(application, request, &response);
 505             }
 506             catch (exception& ex) {
 507                 worked2 = false;
 508                 m_log.error("error removing active session (%s): %s", session_id.c_str(), ex.what());
 509             }
 510         }
 511
 512         return sendResponse(
 513             logoutRequest->getID(),
 514             (worked1 && worked2) ? StatusCode::SUCCESS : StatusCode::RESPONDER,
 515             (worked1 && worked2) ? nullptr : StatusCode::PARTIAL_LOGOUT,
 516             nullptr,
 517             relayState.c_str(),
 518             policy->getIssuerMetadata(),
 519             application,
 520             response,
 521             m_decoder->isUserAgentPresent()
 522             );
 523     }
 524
 525     // A LogoutResponse completes an SP-initiated logout sequence.
 526     const LogoutResponse* logoutResponse = dynamic_cast<LogoutResponse*>(msg.get());
 527     if (logoutResponse) {
 528         if (!policy->isAuthenticated()) {
 529             SecurityPolicyException ex("Security of LogoutResponse not established.");
 530             if (policy->getIssuerMetadata())
 531                 annotateException(&ex, policy->getIssuerMetadata()); // throws it
 532             ex.raise();
 533         }
 534         checkError(logoutResponse, policy->getIssuerMetadata()); // throws if Status doesn't look good...
 535
 536         // If relay state is set, recover the original return URL.
 537         if (!relayState.empty())
 538             recoverRelayState(application, request, response, relayState);
 539
 540         // Check for partial logout.
 541         const StatusCode* sc = logoutResponse->getStatus() ? logoutResponse->getStatus()->getStatusCode() : nullptr;
 542         sc = sc ? sc->getStatusCode() : nullptr;
 543         if (sc && XMLString::equals(sc->getValue(), StatusCode::PARTIAL_LOGOUT))
 544             return sendLogoutPage(application, request, response, "partial");
 545
 546         if (!relayState.empty())
 547             return make_pair(true, response.sendRedirect(relayState.c_str()));
 548
 549         // Return template for completion of logout.
 550         return sendLogoutPage(application, request, response, "global");
 551     }
 552
 553     FatalProfileException ex("Incoming message was not a samlp:LogoutRequest or samlp:LogoutResponse.");
 554     if (policy->getIssuerMetadata())
 555         annotateException(&ex, policy->getIssuerMetadata()); // throws it
 556     ex.raise();
 557     return make_pair(false,0L);  // never happen, satisfies compiler
 558 #else
 559     throw ConfigurationException("Cannot process logout message using lite version of shibsp library.");
 560 #endif
 561 }
 562
 563 #ifndef SHIBSP_LITE
 564
 565 pair<bool,long> SAML2Logout::sendResponse(
 566     const XMLCh* requestID,
 567     const XMLCh* code,
 568     const XMLCh* subcode,
 569     const char* msg,
 570     const char* relayState,
 571     const RoleDescriptor* role,
 572     const Application& application,
 573     HTTPResponse& httpResponse,
 574     bool front
 575     ) const
 576 {
 577     // Get endpoint and encoder to use.
 578     const EndpointType* ep = nullptr;
 579     const MessageEncoder* encoder = nullptr;
 580     if (front) {
 581         const IDPSSODescriptor* idp = dynamic_cast<const IDPSSODescriptor*>(role);
 582         for (vector<const XMLCh*>::const_iterator b = m_bindings.begin(); idp && b!=m_bindings.end(); ++b) {
 583             if (ep=EndpointManager<SingleLogoutService>(idp->getSingleLogoutServices()).getByBinding(*b)) {
 584                 map<const XMLCh*,MessageEncoder*>::const_iterator enc = m_encoders.find(*b);
 585                 if (enc!=m_encoders.end())
 586                     encoder = enc->second;
 587                 break;
 588             }
 589         }
 590         if (!ep || !encoder) {
 591             auto_ptr_char id(dynamic_cast<EntityDescriptor*>(role->getParent())->getEntityID());
 592             m_log.error("unable to locate compatible SLO service for provider (%s)", id.get());
 593             MetadataException ex("Unable to locate endpoint at IdP ($entityID) to send LogoutResponse.");
 594             annotateException(&ex, role);   // throws it
 595         }
 596     }
 597     else {
 598         encoder = m_encoders.begin()->second;
 599     }
 600
 601     // Prepare response.
 602     auto_ptr<LogoutResponse> logout(LogoutResponseBuilder::buildLogoutResponse());
 603     logout->setInResponseTo(requestID);
 604     if (ep) {
 605         const XMLCh* loc = ep->getResponseLocation();
 606         if (!loc || !*loc)
 607             loc = ep->getLocation();
 608         logout->setDestination(loc);
 609     }
 610     Issuer* issuer = IssuerBuilder::buildIssuer();
 611     logout->setIssuer(issuer);
 612     issuer->setName(application.getRelyingParty(dynamic_cast<EntityDescriptor*>(role->getParent()))->getXMLString("entityID").second);
 613     fillStatus(*logout.get(), code, subcode, msg);
 614
 615     auto_ptr_char dest(logout->getDestination());
 616
 617     long ret = sendMessage(*encoder, logout.get(), relayState, dest.get(), role, application, httpResponse);
 618     logout.release();  // freed by encoder
 619     return make_pair(true,ret);
 620 }
 621
 622 #endif