shibsp/handler/impl/SAML2Logout.cpp

   1 /*
   2  *  Copyright 2001-2007 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 "handler/AbstractHandler.h"
  28 #include "handler/LogoutHandler.h"
  29 #include "util/SPConstants.h"
  30
  31 #ifndef SHIBSP_LITE
  32 # include "SessionCache.h"
  33 # include "security/SecurityPolicy.h"
  34 # include "util/TemplateParameters.h"
  35 # include <fstream>
  36 # include <saml/SAMLConfig.h>
  37 # include <saml/saml2/core/Protocols.h>
  38 # include <saml/saml2/metadata/EndpointManager.h>
  39 # include <saml/saml2/metadata/MetadataCredentialCriteria.h>
  40 # include <xmltooling/util/URLEncoder.h>
  41 using namespace opensaml::saml2;
  42 using namespace opensaml::saml2p;
  43 using namespace opensaml::saml2md;
  44 using namespace opensaml;
  45 #endif
  46
  47 using namespace shibsp;
  48 using namespace xmltooling;
  49 using namespace std;
  50
  51 namespace shibsp {
  52
  53 #if defined (_MSC_VER)
  54     #pragma warning( push )
  55     #pragma warning( disable : 4250 )
  56 #endif
  57
  58     class SHIBSP_DLLLOCAL SAML2Logout : public AbstractHandler, public LogoutHandler
  59     {
  60     public:
  61         SAML2Logout(const DOMElement* e, const char* appId);
  62         virtual ~SAML2Logout() {
  63 #ifndef SHIBSP_LITE
  64             if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
  65                 delete m_decoder;
  66                 XMLString::release(&m_outgoing);
  67                 for_each(m_encoders.begin(), m_encoders.end(), cleanup_pair<const XMLCh*,MessageEncoder>());
  68             }
  69 #endif
  70         }
  71
  72         void receive(DDF& in, ostream& out);
  73         pair<bool,long> run(SPRequest& request, bool isHandler=true) const;
  74
  75 #ifndef SHIBSP_LITE
  76         void generateMetadata(SPSSODescriptor& role, const char* handlerURL) const {
  77             const char* loc = getString("Location").second;
  78             string hurl(handlerURL);
  79             if (*loc != '/')
  80                 hurl += '/';
  81             hurl += loc;
  82             auto_ptr_XMLCh widen(hurl.c_str());
  83             SingleLogoutService* ep = SingleLogoutServiceBuilder::buildSingleLogoutService();
  84             ep->setLocation(widen.get());
  85             ep->setBinding(getXMLString("Binding").second);
  86             role.getSingleLogoutServices().push_back(ep);
  87             role.addSupport(samlconstants::SAML20P_NS);
  88         }
  89
  90         const char* getType() const {
  91             return "SingleLogoutService";
  92         }
  93 #endif
  94
  95     private:
  96         pair<bool,long> doRequest(
  97             const Application& application, const char* session_id, const HTTPRequest& httpRequest, HTTPResponse& httpResponse
  98             ) const;
  99
 100 #ifndef SHIBSP_LITE
 101         bool stronglyMatches(const XMLCh* idp, const XMLCh* sp, const saml2::NameID& n1, const saml2::NameID& n2) const;
 102
 103         pair<bool,long> sendResponse(
 104             const XMLCh* requestID,
 105             const XMLCh* code,
 106             const XMLCh* subcode,
 107             const char* msg,
 108             const char* relayState,
 109             const RoleDescriptor* role,
 110             const Application& application,
 111             HTTPResponse& httpResponse,
 112             bool front
 113             ) const;
 114
 115         QName m_role;
 116         MessageDecoder* m_decoder;
 117         XMLCh* m_outgoing;
 118         vector<const XMLCh*> m_bindings;
 119         map<const XMLCh*,MessageEncoder*> m_encoders;
 120 #endif
 121     };
 122
 123 #if defined (_MSC_VER)
 124     #pragma warning( pop )
 125 #endif
 126
 127     Handler* SHIBSP_DLLLOCAL SAML2LogoutFactory(const pair<const DOMElement*,const char*>& p)
 128     {
 129         return new SAML2Logout(p.first, p.second);
 130     }
 131 };
 132
 133 SAML2Logout::SAML2Logout(const DOMElement* e, const char* appId)
 134     : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT".Logout.SAML2"))
 135 #ifndef SHIBSP_LITE
 136         ,m_role(samlconstants::SAML20MD_NS, IDPSSODescriptor::LOCAL_NAME), m_decoder(NULL), m_outgoing(NULL)
 137 #endif
 138 {
 139 #ifndef SHIBSP_LITE
 140     m_initiator = false;
 141     m_preserve.push_back("ID");
 142     m_preserve.push_back("entityID");
 143     m_preserve.push_back("RelayState");
 144
 145     if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
 146         SAMLConfig& conf = SAMLConfig::getConfig();
 147
 148         // Handle incoming binding.
 149         m_decoder = conf.MessageDecoderManager.newPlugin(getString("Binding").second,make_pair(e,shibspconstants::SHIB2SPCONFIG_NS));
 150         m_decoder->setArtifactResolver(SPConfig::getConfig().getArtifactResolver());
 151
 152         if (m_decoder->isUserAgentPresent()) {
 153             // Handle front-channel binding setup.
 154             pair<bool,const XMLCh*> outgoing = getXMLString("outgoingBindings", m_configNS.get());
 155             if (outgoing.first) {
 156                 m_outgoing = XMLString::replicate(outgoing.second);
 157                 XMLString::trim(m_outgoing);
 158             }
 159             else {
 160                 // No override, so we'll install a default binding precedence.
 161                 string prec = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
 162                     samlconstants::SAML20_BINDING_HTTP_POST_SIMPLESIGN + ' ' + samlconstants::SAML20_BINDING_HTTP_ARTIFACT;
 163                 m_outgoing = XMLString::transcode(prec.c_str());
 164             }
 165
 166             int pos;
 167             XMLCh* start = m_outgoing;
 168             while (start && *start) {
 169                 pos = XMLString::indexOf(start,chSpace);
 170                 if (pos != -1)
 171                     *(start + pos)=chNull;
 172                 m_bindings.push_back(start);
 173                 try {
 174                     auto_ptr_char b(start);
 175                     MessageEncoder * encoder = conf.MessageEncoderManager.newPlugin(b.get(),make_pair(e,shibspconstants::SHIB2SPCONFIG_NS));
 176                     m_encoders[start] = encoder;
 177                     m_log.debug("supporting outgoing front-channel binding (%s)", b.get());
 178                 }
 179                 catch (exception& ex) {
 180                     m_log.error("error building MessageEncoder: %s", ex.what());
 181                 }
 182                 if (pos != -1)
 183                     start = start + pos + 1;
 184                 else
 185                     break;
 186             }
 187         }
 188         else {
 189             MessageEncoder* encoder = conf.MessageEncoderManager.newPlugin(
 190                 getString("Binding").second,make_pair(e,shibspconstants::SHIB2SPCONFIG_NS)
 191                 );
 192             m_encoders.insert(pair<const XMLCh*,MessageEncoder*>(NULL, encoder));
 193         }
 194     }
 195 #endif
 196
 197     string address(appId);
 198     address += getString("Location").second;
 199     setAddress(address.c_str());
 200 }
 201
 202 pair<bool,long> SAML2Logout::run(SPRequest& request, bool isHandler) const
 203 {
 204     // Defer to base class for front-channel loop first.
 205     // This won't initiate the loop, only continue/end it.
 206     pair<bool,long> ret = LogoutHandler::run(request, isHandler);
 207     if (ret.first)
 208         return ret;
 209
 210     // Get the session_id in case this is a front-channel LogoutRequest.
 211     pair<string,const char*> shib_cookie = request.getApplication().getCookieNameProps("_shibsession_");
 212     const char* session_id = request.getCookie(shib_cookie.first.c_str());
 213
 214     SPConfig& conf = SPConfig::getConfig();
 215     if (conf.isEnabled(SPConfig::OutOfProcess)) {
 216         // When out of process, we run natively and directly process the message.
 217         return doRequest(request.getApplication(), session_id, request, request);
 218     }
 219     else {
 220         // When not out of process, we remote all the message processing.
 221         DDF out,in = wrap(request, NULL, true);
 222         DDFJanitor jin(in), jout(out);
 223         if (session_id)
 224             in.addmember("session_id").string(session_id);
 225         out=request.getServiceProvider().getListenerService()->send(in);
 226         return unwrap(request, out);
 227     }
 228 }
 229
 230 void SAML2Logout::receive(DDF& in, ostream& out)
 231 {
 232     // Find application.
 233     const char* aid=in["application_id"].string();
 234     const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : NULL;
 235     if (!app) {
 236         // Something's horribly wrong.
 237         m_log.error("couldn't find application (%s) for logout", aid ? aid : "(missing)");
 238         throw ConfigurationException("Unable to locate application for logout, deleted?");
 239     }
 240
 241     // Unpack the request.
 242     DDF ret(NULL);
 243     DDFJanitor jout(ret);
 244     auto_ptr<HTTPRequest> req(getRequest(in));
 245     auto_ptr<HTTPResponse> resp(getResponse(ret));
 246
 247     // Since we're remoted, the result should either be a throw, which we pass on,
 248     // a false/0 return, which we just return as an empty structure, or a response/redirect,
 249     // which we capture in the facade and send back.
 250     doRequest(*app, in["session_id"].string(), *req.get(), *resp.get());
 251     out << ret;
 252 }
 253
 254 pair<bool,long> SAML2Logout::doRequest(
 255     const Application& application, const char* session_id, const HTTPRequest& request, HTTPResponse& response
 256     ) const
 257 {
 258 #ifndef SHIBSP_LITE
 259     SessionCache* cache = application.getServiceProvider().getSessionCache();
 260     if (!strcmp(request.getMethod(),"GET") && request.getParameter("notifying")) {
 261
 262         // This is returning from a front-channel notification, so we have to do the back-channel and then
 263         // respond. To do that, we need state from the original request.
 264         if (!request.getParameter("entityID")) {
 265             if (session_id) {
 266                 cache->remove(session_id, application);
 267                 // Clear the cookie.
 268                 pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 269                 response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 270             }
 271             throw FatalProfileException("Application notification loop did not return entityID for LogoutResponse.");
 272         }
 273
 274         // Best effort on back channel and to remove the user agent's session.
 275         bool worked1 = false,worked2 = false;
 276         if (session_id) {
 277             vector<string> sessions(1,session_id);
 278             worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 279             try {
 280                 cache->remove(session_id, application);
 281                 worked2 = true;
 282             }
 283             catch (exception& ex) {
 284                 m_log.error("error removing session (%s): %s", session_id, ex.what());
 285             }
 286
 287             // Clear the cookie.
 288             pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 289             response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 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         MetadataProvider::Criteria mc(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, NULL, NULL, request.getParameter("RelayState"), entity.second, application, response, true
 317                 );
 318         }
 319
 320         return sendResponse(
 321             reqid.get(),
 322             StatusCode::RESPONDER, NULL, "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     // Access policy properties.
 339     const PropertySet* settings = application.getServiceProvider().getPolicySettings(policyId.second);
 340     pair<bool,bool> validate = settings->getBool("validate");
 341
 342     // Lock metadata for use by policy.
 343     Locker metadataLocker(application.getMetadataProvider());
 344
 345     // Create the policy.
 346     shibsp::SecurityPolicy policy(application, &m_role, validate.first && validate.second);
 347
 348     // Decode the message.
 349     string relayState;
 350     auto_ptr<XMLObject> msg(m_decoder->decode(relayState, request, policy));
 351     const LogoutRequest* logoutRequest = dynamic_cast<LogoutRequest*>(msg.get());
 352     if (logoutRequest) {
 353         if (!policy.isAuthenticated())
 354             throw SecurityPolicyException("Security of LogoutRequest not established.");
 355
 356         // Message from IdP to logout one or more sessions.
 357
 358         // If this is front-channel, we have to have a session_id to use already.
 359         if (m_decoder->isUserAgentPresent() && !session_id) {
 360             m_log.error("no active session");
 361             return sendResponse(
 362                 logoutRequest->getID(),
 363                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "No active session found in request.",
 364                 relayState.c_str(),
 365                 policy.getIssuerMetadata(),
 366                 application,
 367                 response,
 368                 true
 369                 );
 370         }
 371
 372         bool ownedName = false;
 373         NameID* nameid = logoutRequest->getNameID();
 374         if (!nameid) {
 375             // Check for EncryptedID.
 376             EncryptedID* encname = logoutRequest->getEncryptedID();
 377             if (encname) {
 378                 CredentialResolver* cr=application.getCredentialResolver();
 379                 if (!cr)
 380                     m_log.warn("found encrypted NameID, but no decryption credential was available");
 381                 else {
 382                     Locker credlocker(cr);
 383                     auto_ptr<MetadataCredentialCriteria> mcc(
 384                         policy.getIssuerMetadata() ? new MetadataCredentialCriteria(*policy.getIssuerMetadata()) : NULL
 385                         );
 386                     try {
 387                         auto_ptr<XMLObject> decryptedID(encname->decrypt(*cr,application.getXMLString("entityID").second,mcc.get()));
 388                         nameid = dynamic_cast<NameID*>(decryptedID.get());
 389                         if (nameid) {
 390                             ownedName = true;
 391                             decryptedID.release();
 392                         }
 393                     }
 394                     catch (exception& ex) {
 395                         m_log.error(ex.what());
 396                     }
 397                 }
 398             }
 399         }
 400         if (!nameid) {
 401             // No NameID, so must respond with an error.
 402             m_log.error("NameID not found in request");
 403             return sendResponse(
 404                 logoutRequest->getID(),
 405                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "NameID not found in request.",
 406                 relayState.c_str(),
 407                 policy.getIssuerMetadata(),
 408                 application,
 409                 response,
 410                 m_decoder->isUserAgentPresent()
 411                 );
 412         }
 413
 414         auto_ptr<NameID> namewrapper(ownedName ? nameid : NULL);
 415
 416         // Suck indexes out of the request for next steps.
 417         set<string> indexes;
 418         EntityDescriptor* entity = policy.getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy.getIssuerMetadata()->getParent()) : NULL;
 419         const vector<SessionIndex*> sindexes = logoutRequest->getSessionIndexs();
 420         for (vector<SessionIndex*>::const_iterator i = sindexes.begin(); i != sindexes.end(); ++i) {
 421             auto_ptr_char sindex((*i)->getSessionIndex());
 422             indexes.insert(sindex.get());
 423         }
 424
 425         // For a front-channel LogoutRequest, we have to match the information in the request
 426         // against the current session.
 427         if (session_id) {
 428             if (!cache->matches(session_id, entity, *nameid, &indexes, application)) {
 429                 return sendResponse(
 430                     logoutRequest->getID(),
 431                     StatusCode::REQUESTER, StatusCode::REQUEST_DENIED, "Active sessions did not match logout request.",
 432                     relayState.c_str(),
 433                     policy.getIssuerMetadata(),
 434                     application,
 435                     response,
 436                     true
 437                     );
 438             }
 439
 440         }
 441
 442         // Now we perform "logout" by finding the matching sessions.
 443         vector<string> sessions;
 444         try {
 445             time_t expires = logoutRequest->getNotOnOrAfter() ? logoutRequest->getNotOnOrAfterEpoch() : 0;
 446             cache->logout(entity, *nameid, &indexes, expires, application, sessions);
 447
 448             // Now we actually terminate everything except for the active session,
 449             // if this is front-channel, for notification purposes.
 450             for (vector<string>::const_iterator sit = sessions.begin(); sit != sessions.end(); ++sit)
 451                 if (session_id && strcmp(sit->c_str(), session_id))
 452                     cache->remove(sit->c_str(), application);
 453         }
 454         catch (exception& ex) {
 455             m_log.error("error while logging out matching sessions: %s", ex.what());
 456             return sendResponse(
 457                 logoutRequest->getID(),
 458                 StatusCode::RESPONDER, NULL, ex.what(),
 459                 relayState.c_str(),
 460                 policy.getIssuerMetadata(),
 461                 application,
 462                 response,
 463                 m_decoder->isUserAgentPresent()
 464                 );
 465         }
 466
 467         if (m_decoder->isUserAgentPresent()) {
 468             // Pass control to the first front channel notification point, if any.
 469             map<string,string> parammap;
 470             if (!relayState.empty())
 471                 parammap["RelayState"] = relayState;
 472             auto_ptr_char entityID(entity ? entity->getEntityID() : NULL);
 473             if (entityID.get())
 474                 parammap["entityID"] = entityID.get();
 475             auto_ptr_char reqID(logoutRequest->getID());
 476             if (reqID.get())
 477                 parammap["ID"] = reqID.get();
 478             pair<bool,long> result = notifyFrontChannel(application, request, response, &parammap);
 479             if (result.first)
 480                 return result;
 481         }
 482
 483         // For back-channel requests, or if no front-channel notification is needed...
 484         bool worked1 = false,worked2 = false;
 485         worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 486         if (session_id) {
 487             // One last session to yoink...
 488             try {
 489                 cache->remove(session_id, application);
 490                 worked2 = true;
 491             }
 492             catch (exception& ex) {
 493                 m_log.error("error removing active session (%s): %s", session_id, ex.what());
 494             }
 495
 496             // Clear the cookie.
 497             pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 498             response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 499         }
 500
 501         return sendResponse(
 502             logoutRequest->getID(),
 503             (worked1 && worked2) ? StatusCode::SUCCESS : StatusCode::RESPONDER,
 504             (worked1 && worked2) ? NULL : StatusCode::PARTIAL_LOGOUT,
 505             NULL,
 506             relayState.c_str(),
 507             policy.getIssuerMetadata(),
 508             application,
 509             response,
 510             m_decoder->isUserAgentPresent()
 511             );
 512     }
 513
 514     // A LogoutResponse completes an SP-initiated logout sequence.
 515     const LogoutResponse* logoutResponse = dynamic_cast<LogoutResponse*>(msg.get());
 516     if (logoutResponse) {
 517         if (!policy.isAuthenticated()) {
 518             SecurityPolicyException ex("Security of LogoutResponse not established.");
 519             if (policy.getIssuerMetadata())
 520                 annotateException(&ex, policy.getIssuerMetadata()); // throws it
 521             ex.raise();
 522         }
 523         checkError(logoutResponse, policy.getIssuerMetadata()); // throws if Status doesn't look good...
 524
 525         // Return template for completion of global logout, or redirect to homeURL.
 526         return sendLogoutPage(application, response, false, "Global logout completed.");
 527     }
 528
 529     FatalProfileException ex("Incoming message was not a samlp:LogoutRequest or samlp:LogoutResponse.");
 530     if (policy.getIssuerMetadata())
 531         annotateException(&ex, policy.getIssuerMetadata()); // throws it
 532     ex.raise();
 533     return make_pair(false,0);  // never happen, satisfies compiler
 534 #else
 535     throw ConfigurationException("Cannot process logout message using lite version of shibsp library.");
 536 #endif
 537 }
 538
 539 #ifndef SHIBSP_LITE
 540
 541 bool SAML2Logout::stronglyMatches(const XMLCh* idp, const XMLCh* sp, const saml2::NameID& n1, const saml2::NameID& n2) const
 542 {
 543     if (!XMLString::equals(n1.getName(), n2.getName()))
 544         return false;
 545
 546     const XMLCh* s1 = n1.getFormat();
 547     const XMLCh* s2 = n2.getFormat();
 548     if (!s1 || !*s1)
 549         s1 = saml2::NameID::UNSPECIFIED;
 550     if (!s2 || !*s2)
 551         s2 = saml2::NameID::UNSPECIFIED;
 552     if (!XMLString::equals(s1,s2))
 553         return false;
 554
 555     s1 = n1.getNameQualifier();
 556     s2 = n2.getNameQualifier();
 557     if (!s1 || !*s1)
 558         s1 = idp;
 559     if (!s2 || !*s2)
 560         s2 = idp;
 561     if (!XMLString::equals(s1,s2))
 562         return false;
 563
 564     s1 = n1.getSPNameQualifier();
 565     s2 = n2.getSPNameQualifier();
 566     if (!s1 || !*s1)
 567         s1 = sp;
 568     if (!s2 || !*s2)
 569         s2 = sp;
 570     if (!XMLString::equals(s1,s2))
 571         return false;
 572
 573     return true;
 574 }
 575
 576 pair<bool,long> SAML2Logout::sendResponse(
 577     const XMLCh* requestID,
 578     const XMLCh* code,
 579     const XMLCh* subcode,
 580     const char* msg,
 581     const char* relayState,
 582     const RoleDescriptor* role,
 583     const Application& application,
 584     HTTPResponse& httpResponse,
 585     bool front
 586     ) const
 587 {
 588     // Get endpoint and encoder to use.
 589     const EndpointType* ep = NULL;
 590     const MessageEncoder* encoder = NULL;
 591     if (front) {
 592         const IDPSSODescriptor* idp = dynamic_cast<const IDPSSODescriptor*>(role);
 593         for (vector<const XMLCh*>::const_iterator b = m_bindings.begin(); idp && b!=m_bindings.end(); ++b) {
 594             if (ep=EndpointManager<SingleLogoutService>(idp->getSingleLogoutServices()).getByBinding(*b)) {
 595                 map<const XMLCh*,MessageEncoder*>::const_iterator enc = m_encoders.find(*b);
 596                 if (enc!=m_encoders.end())
 597                     encoder = enc->second;
 598                 break;
 599             }
 600         }
 601         if (!ep || !encoder) {
 602             auto_ptr_char id(dynamic_cast<EntityDescriptor*>(role->getParent())->getEntityID());
 603             m_log.error("unable to locate compatible SLO service for provider (%s)", id.get());
 604             MetadataException ex("Unable to locate endpoint at IdP ($entityID) to send LogoutResponse.");
 605             annotateException(&ex, role);   // throws it
 606         }
 607     }
 608     else {
 609         encoder = m_encoders.begin()->second;
 610     }
 611
 612     // Prepare response.
 613     auto_ptr<LogoutResponse> logout(LogoutResponseBuilder::buildLogoutResponse());
 614     logout->setInResponseTo(requestID);
 615     if (ep) {
 616         const XMLCh* loc = ep->getResponseLocation();
 617         if (!loc || !*loc)
 618             loc = ep->getLocation();
 619         logout->setDestination(loc);
 620     }
 621     Issuer* issuer = IssuerBuilder::buildIssuer();
 622     logout->setIssuer(issuer);
 623     issuer->setName(application.getXMLString("entityID").second);
 624     fillStatus(*logout.get(), code, subcode, msg);
 625
 626     auto_ptr_char dest(logout->getDestination());
 627
 628     long ret = sendMessage(*encoder, logout.get(), relayState, dest.get(), role, application, httpResponse);
 629     logout.release();  // freed by encoder
 630     return make_pair(true,ret);
 631 }
 632
 633 #endif