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 #endif
  90
  91     private:
  92         pair<bool,long> doRequest(
  93             const Application& application, const char* session_id, const HTTPRequest& httpRequest, HTTPResponse& httpResponse
  94             ) const;
  95
  96 #ifndef SHIBSP_LITE
  97         bool stronglyMatches(const XMLCh* idp, const XMLCh* sp, const saml2::NameID& n1, const saml2::NameID& n2) const;
  98
  99         pair<bool,long> sendResponse(
 100             const XMLCh* requestID,
 101             const XMLCh* code,
 102             const XMLCh* subcode,
 103             const char* msg,
 104             const char* relayState,
 105             const RoleDescriptor* role,
 106             const Application& application,
 107             HTTPResponse& httpResponse,
 108             bool front
 109             ) const;
 110
 111         QName m_role;
 112         MessageDecoder* m_decoder;
 113         XMLCh* m_outgoing;
 114         vector<const XMLCh*> m_bindings;
 115         map<const XMLCh*,MessageEncoder*> m_encoders;
 116 #endif
 117     };
 118
 119 #if defined (_MSC_VER)
 120     #pragma warning( pop )
 121 #endif
 122
 123     Handler* SHIBSP_DLLLOCAL SAML2LogoutFactory(const pair<const DOMElement*,const char*>& p)
 124     {
 125         return new SAML2Logout(p.first, p.second);
 126     }
 127 };
 128
 129 SAML2Logout::SAML2Logout(const DOMElement* e, const char* appId)
 130     : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT".Logout.SAML2"))
 131 #ifndef SHIBSP_LITE
 132         ,m_role(samlconstants::SAML20MD_NS, IDPSSODescriptor::LOCAL_NAME), m_decoder(NULL), m_outgoing(NULL)
 133 #endif
 134 {
 135 #ifndef SHIBSP_LITE
 136     m_initiator = false;
 137     m_preserve.push_back("ID");
 138     m_preserve.push_back("entityID");
 139     m_preserve.push_back("RelayState");
 140
 141     if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
 142         SAMLConfig& conf = SAMLConfig::getConfig();
 143
 144         // Handle incoming binding.
 145         m_decoder = conf.MessageDecoderManager.newPlugin(getString("Binding").second,make_pair(e,shibspconstants::SHIB2SPCONFIG_NS));
 146         m_decoder->setArtifactResolver(SPConfig::getConfig().getArtifactResolver());
 147
 148         if (m_decoder->isUserAgentPresent()) {
 149             // Handle front-channel binding setup.
 150             pair<bool,const XMLCh*> outgoing = getXMLString("outgoingBindings", m_configNS.get());
 151             if (outgoing.first) {
 152                 m_outgoing = XMLString::replicate(outgoing.second);
 153                 XMLString::trim(m_outgoing);
 154             }
 155             else {
 156                 // No override, so we'll install a default binding precedence.
 157                 string prec = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
 158                     samlconstants::SAML20_BINDING_HTTP_POST_SIMPLESIGN + ' ' + samlconstants::SAML20_BINDING_HTTP_ARTIFACT;
 159                 m_outgoing = XMLString::transcode(prec.c_str());
 160             }
 161
 162             int pos;
 163             XMLCh* start = m_outgoing;
 164             while (start && *start) {
 165                 pos = XMLString::indexOf(start,chSpace);
 166                 if (pos != -1)
 167                     *(start + pos)=chNull;
 168                 m_bindings.push_back(start);
 169                 try {
 170                     auto_ptr_char b(start);
 171                     MessageEncoder * encoder = conf.MessageEncoderManager.newPlugin(b.get(),make_pair(e,shibspconstants::SHIB2SPCONFIG_NS));
 172                     m_encoders[start] = encoder;
 173                     m_log.debug("supporting outgoing front-channel binding (%s)", b.get());
 174                 }
 175                 catch (exception& ex) {
 176                     m_log.error("error building MessageEncoder: %s", ex.what());
 177                 }
 178                 if (pos != -1)
 179                     start = start + pos + 1;
 180                 else
 181                     break;
 182             }
 183         }
 184         else {
 185             MessageEncoder* encoder = conf.MessageEncoderManager.newPlugin(
 186                 getString("Binding").second,make_pair(e,shibspconstants::SHIB2SPCONFIG_NS)
 187                 );
 188             m_encoders.insert(pair<const XMLCh*,MessageEncoder*>(NULL, encoder));
 189         }
 190     }
 191 #endif
 192
 193     string address(appId);
 194     address += getString("Location").second;
 195     setAddress(address.c_str());
 196 }
 197
 198 pair<bool,long> SAML2Logout::run(SPRequest& request, bool isHandler) const
 199 {
 200     // Defer to base class for front-channel loop first.
 201     // This won't initiate the loop, only continue/end it.
 202     pair<bool,long> ret = LogoutHandler::run(request, isHandler);
 203     if (ret.first)
 204         return ret;
 205
 206     // Get the session_id in case this is a front-channel LogoutRequest.
 207     pair<string,const char*> shib_cookie = request.getApplication().getCookieNameProps("_shibsession_");
 208     const char* session_id = request.getCookie(shib_cookie.first.c_str());
 209
 210     SPConfig& conf = SPConfig::getConfig();
 211     if (conf.isEnabled(SPConfig::OutOfProcess)) {
 212         // When out of process, we run natively and directly process the message.
 213         return doRequest(request.getApplication(), session_id, request, request);
 214     }
 215     else {
 216         // When not out of process, we remote all the message processing.
 217         DDF out,in = wrap(request, NULL, true);
 218         DDFJanitor jin(in), jout(out);
 219         if (session_id)
 220             in.addmember("session_id").string(session_id);
 221         out=request.getServiceProvider().getListenerService()->send(in);
 222         return unwrap(request, out);
 223     }
 224 }
 225
 226 void SAML2Logout::receive(DDF& in, ostream& out)
 227 {
 228     // Find application.
 229     const char* aid=in["application_id"].string();
 230     const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : NULL;
 231     if (!app) {
 232         // Something's horribly wrong.
 233         m_log.error("couldn't find application (%s) for logout", aid ? aid : "(missing)");
 234         throw ConfigurationException("Unable to locate application for logout, deleted?");
 235     }
 236
 237     // Unpack the request.
 238     DDF ret(NULL);
 239     DDFJanitor jout(ret);
 240     auto_ptr<HTTPRequest> req(getRequest(in));
 241     auto_ptr<HTTPResponse> resp(getResponse(ret));
 242
 243     // Since we're remoted, the result should either be a throw, which we pass on,
 244     // a false/0 return, which we just return as an empty structure, or a response/redirect,
 245     // which we capture in the facade and send back.
 246     doRequest(*app, in["session_id"].string(), *req.get(), *resp.get());
 247     out << ret;
 248 }
 249
 250 pair<bool,long> SAML2Logout::doRequest(
 251     const Application& application, const char* session_id, const HTTPRequest& request, HTTPResponse& response
 252     ) const
 253 {
 254 #ifndef SHIBSP_LITE
 255     SessionCache* cache = application.getServiceProvider().getSessionCache();
 256     if (!strcmp(request.getMethod(),"GET") && request.getParameter("notifying")) {
 257
 258         // This is returning from a front-channel notification, so we have to do the back-channel and then
 259         // respond. To do that, we need state from the original request.
 260         if (!request.getParameter("entityID")) {
 261             if (session_id) {
 262                 cache->remove(session_id, application);
 263                 // Clear the cookie.
 264                 pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 265                 response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 266             }
 267             throw FatalProfileException("Application notification loop did not return entityID for LogoutResponse.");
 268         }
 269
 270         // Best effort on back channel and to remove the user agent's session.
 271         bool worked1 = false,worked2 = false;
 272         if (session_id) {
 273             vector<string> sessions(1,session_id);
 274             worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 275             try {
 276                 cache->remove(session_id, application);
 277                 worked2 = true;
 278             }
 279             catch (exception& ex) {
 280                 m_log.error("error removing session (%s): %s", session_id, ex.what());
 281             }
 282
 283             // Clear the cookie.
 284             pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 285             response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 286         }
 287         else {
 288             worked1 = worked2 = true;
 289         }
 290
 291         // We need metadata to issue a response.
 292         Locker metadataLocker(application.getMetadataProvider());
 293         const EntityDescriptor* entity = application.getMetadataProvider()->getEntityDescriptor(request.getParameter("entityID"));
 294         if (!entity) {
 295             throw MetadataException(
 296                 "Unable to locate metadata for identity provider ($entityID)", namedparams(1, "entityID", request.getParameter("entityID"))
 297                 );
 298         }
 299         const IDPSSODescriptor* idp = entity->getIDPSSODescriptor(samlconstants::SAML20P_NS);
 300         if (!idp) {
 301             throw MetadataException(
 302                 "Unable to locate SAML 2.0 IdP role for identity provider ($entityID).",
 303                 namedparams(1, "entityID", request.getParameter("entityID"))
 304                 );
 305         }
 306
 307         auto_ptr_XMLCh reqid(request.getParameter("ID"));
 308         if (worked1 && worked2) {
 309             // Successful LogoutResponse. Has to be front-channel or we couldn't be here.
 310             return sendResponse(
 311                 reqid.get(), StatusCode::SUCCESS, NULL, NULL, request.getParameter("RelayState"), idp, application, response, true
 312                 );
 313         }
 314
 315         return sendResponse(
 316             reqid.get(),
 317             StatusCode::RESPONDER, NULL, "Unable to fully destroy principal's session.",
 318             request.getParameter("RelayState"),
 319             idp,
 320             application,
 321             response,
 322             true
 323             );
 324     }
 325
 326     // If we get here, it's an external protocol message to decode.
 327
 328     // Locate policy key.
 329     pair<bool,const char*> policyId = getString("policyId", m_configNS.get());  // namespace-qualified if inside handler element
 330     if (!policyId.first)
 331         policyId = application.getString("policyId");   // unqualified in Application(s) element
 332
 333     // Access policy properties.
 334     const PropertySet* settings = application.getServiceProvider().getPolicySettings(policyId.second);
 335     pair<bool,bool> validate = settings->getBool("validate");
 336
 337     // Lock metadata for use by policy.
 338     Locker metadataLocker(application.getMetadataProvider());
 339
 340     // Create the policy.
 341     shibsp::SecurityPolicy policy(application, &m_role, validate.first && validate.second);
 342
 343     // Decode the message.
 344     string relayState;
 345     auto_ptr<XMLObject> msg(m_decoder->decode(relayState, request, policy));
 346     const LogoutRequest* logoutRequest = dynamic_cast<LogoutRequest*>(msg.get());
 347     if (logoutRequest) {
 348         if (!policy.isAuthenticated())
 349             throw SecurityPolicyException("Security of LogoutRequest not established.");
 350
 351         // Message from IdP to logout one or more sessions.
 352
 353         // If this is front-channel, we have to have a session_id to use already.
 354         if (m_decoder->isUserAgentPresent() && !session_id) {
 355             m_log.error("no active session");
 356             return sendResponse(
 357                 logoutRequest->getID(),
 358                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "No active session found in request.",
 359                 relayState.c_str(),
 360                 policy.getIssuerMetadata(),
 361                 application,
 362                 response,
 363                 true
 364                 );
 365         }
 366
 367         bool ownedName = false;
 368         NameID* nameid = logoutRequest->getNameID();
 369         if (!nameid) {
 370             // Check for EncryptedID.
 371             EncryptedID* encname = logoutRequest->getEncryptedID();
 372             if (encname) {
 373                 CredentialResolver* cr=application.getCredentialResolver();
 374                 if (!cr)
 375                     m_log.warn("found encrypted NameID, but no decryption credential was available");
 376                 else {
 377                     Locker credlocker(cr);
 378                     auto_ptr<MetadataCredentialCriteria> mcc(
 379                         policy.getIssuerMetadata() ? new MetadataCredentialCriteria(*policy.getIssuerMetadata()) : NULL
 380                         );
 381                     try {
 382                         auto_ptr<XMLObject> decryptedID(encname->decrypt(*cr,application.getXMLString("entityID").second,mcc.get()));
 383                         nameid = dynamic_cast<NameID*>(decryptedID.get());
 384                         if (nameid) {
 385                             ownedName = true;
 386                             decryptedID.release();
 387                         }
 388                     }
 389                     catch (exception& ex) {
 390                         m_log.error(ex.what());
 391                     }
 392                 }
 393             }
 394         }
 395         if (!nameid) {
 396             // No NameID, so must respond with an error.
 397             m_log.error("NameID not found in request");
 398             return sendResponse(
 399                 logoutRequest->getID(),
 400                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "NameID not found in request.",
 401                 relayState.c_str(),
 402                 policy.getIssuerMetadata(),
 403                 application,
 404                 response,
 405                 m_decoder->isUserAgentPresent()
 406                 );
 407         }
 408
 409         auto_ptr<NameID> namewrapper(ownedName ? nameid : NULL);
 410
 411         // Suck indexes out of the request for next steps.
 412         set<string> indexes;
 413         EntityDescriptor* entity = policy.getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy.getIssuerMetadata()->getParent()) : NULL;
 414         const vector<SessionIndex*> sindexes = logoutRequest->getSessionIndexs();
 415         for (vector<SessionIndex*>::const_iterator i = sindexes.begin(); i != sindexes.end(); ++i) {
 416             auto_ptr_char sindex((*i)->getSessionIndex());
 417             indexes.insert(sindex.get());
 418         }
 419
 420         // For a front-channel LogoutRequest, we have to match the information in the request
 421         // against the current session.
 422         if (session_id) {
 423             if (!cache->matches(session_id, entity, *nameid, &indexes, application)) {
 424                 return sendResponse(
 425                     logoutRequest->getID(),
 426                     StatusCode::REQUESTER, StatusCode::REQUEST_DENIED, "Active sessions did not match logout request.",
 427                     relayState.c_str(),
 428                     policy.getIssuerMetadata(),
 429                     application,
 430                     response,
 431                     true
 432                     );
 433             }
 434
 435         }
 436
 437         // Now we perform "logout" by finding the matching sessions.
 438         vector<string> sessions;
 439         try {
 440             time_t expires = logoutRequest->getNotOnOrAfter() ? logoutRequest->getNotOnOrAfterEpoch() : 0;
 441             cache->logout(entity, *nameid, &indexes, expires, application, sessions);
 442
 443             // Now we actually terminate everything except for the active session,
 444             // if this is front-channel, for notification purposes.
 445             for (vector<string>::const_iterator sit = sessions.begin(); sit != sessions.end(); ++sit)
 446                 if (session_id && strcmp(sit->c_str(), session_id))
 447                     cache->remove(sit->c_str(), application);
 448         }
 449         catch (exception& ex) {
 450             m_log.error("error while logging out matching sessions: %s", ex.what());
 451             return sendResponse(
 452                 logoutRequest->getID(),
 453                 StatusCode::RESPONDER, NULL, ex.what(),
 454                 relayState.c_str(),
 455                 policy.getIssuerMetadata(),
 456                 application,
 457                 response,
 458                 m_decoder->isUserAgentPresent()
 459                 );
 460         }
 461
 462         if (m_decoder->isUserAgentPresent()) {
 463             // Pass control to the first front channel notification point, if any.
 464             map<string,string> parammap;
 465             if (!relayState.empty())
 466                 parammap["RelayState"] = relayState;
 467             auto_ptr_char entityID(entity ? entity->getEntityID() : NULL);
 468             if (entityID.get())
 469                 parammap["entityID"] = entityID.get();
 470             auto_ptr_char reqID(logoutRequest->getID());
 471             if (reqID.get())
 472                 parammap["ID"] = reqID.get();
 473             pair<bool,long> result = notifyFrontChannel(application, request, response, &parammap);
 474             if (result.first)
 475                 return result;
 476         }
 477
 478         // For back-channel requests, or if no front-channel notification is needed...
 479         bool worked1 = false,worked2 = false;
 480         worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
 481         if (session_id) {
 482             // One last session to yoink...
 483             try {
 484                 cache->remove(session_id, application);
 485                 worked2 = true;
 486             }
 487             catch (exception& ex) {
 488                 m_log.error("error removing active session (%s): %s", session_id, ex.what());
 489             }
 490
 491             // Clear the cookie.
 492             pair<string,const char*> shib_cookie=application.getCookieNameProps("_shibsession_");
 493             response.setCookie(shib_cookie.first.c_str(), shib_cookie.second);
 494         }
 495
 496         return sendResponse(
 497             logoutRequest->getID(),
 498             (worked1 && worked2) ? StatusCode::SUCCESS : StatusCode::RESPONDER,
 499             (worked1 && worked2) ? NULL : StatusCode::PARTIAL_LOGOUT,
 500             NULL,
 501             relayState.c_str(),
 502             policy.getIssuerMetadata(),
 503             application,
 504             response,
 505             m_decoder->isUserAgentPresent()
 506             );
 507     }
 508
 509     // A LogoutResponse completes an SP-initiated logout sequence.
 510     const LogoutResponse* logoutResponse = dynamic_cast<LogoutResponse*>(msg.get());
 511     if (logoutResponse) {
 512         if (!policy.isAuthenticated()) {
 513             SecurityPolicyException ex("Security of LogoutResponse not established.");
 514             if (policy.getIssuerMetadata())
 515                 annotateException(&ex, policy.getIssuerMetadata()); // throws it
 516             ex.raise();
 517         }
 518         checkError(logoutResponse, policy.getIssuerMetadata()); // throws if Status doesn't look good...
 519
 520         // Return template for completion of global logout, or redirect to homeURL.
 521         return sendLogoutPage(application, response, false, "Global logout completed.");
 522     }
 523
 524     FatalProfileException ex("Incoming message was not a samlp:LogoutRequest or samlp:LogoutResponse.");
 525     if (policy.getIssuerMetadata())
 526         annotateException(&ex, policy.getIssuerMetadata()); // throws it
 527     ex.raise();
 528     return make_pair(false,0);  // never happen, satisfies compiler
 529 #else
 530     throw ConfigurationException("Cannot process logout message using lite version of shibsp library.");
 531 #endif
 532 }
 533
 534 #ifndef SHIBSP_LITE
 535
 536 bool SAML2Logout::stronglyMatches(const XMLCh* idp, const XMLCh* sp, const saml2::NameID& n1, const saml2::NameID& n2) const
 537 {
 538     if (!XMLString::equals(n1.getName(), n2.getName()))
 539         return false;
 540
 541     const XMLCh* s1 = n1.getFormat();
 542     const XMLCh* s2 = n2.getFormat();
 543     if (!s1 || !*s1)
 544         s1 = saml2::NameID::UNSPECIFIED;
 545     if (!s2 || !*s2)
 546         s2 = saml2::NameID::UNSPECIFIED;
 547     if (!XMLString::equals(s1,s2))
 548         return false;
 549
 550     s1 = n1.getNameQualifier();
 551     s2 = n2.getNameQualifier();
 552     if (!s1 || !*s1)
 553         s1 = idp;
 554     if (!s2 || !*s2)
 555         s2 = idp;
 556     if (!XMLString::equals(s1,s2))
 557         return false;
 558
 559     s1 = n1.getSPNameQualifier();
 560     s2 = n2.getSPNameQualifier();
 561     if (!s1 || !*s1)
 562         s1 = sp;
 563     if (!s2 || !*s2)
 564         s2 = sp;
 565     if (!XMLString::equals(s1,s2))
 566         return false;
 567
 568     return true;
 569 }
 570
 571 pair<bool,long> SAML2Logout::sendResponse(
 572     const XMLCh* requestID,
 573     const XMLCh* code,
 574     const XMLCh* subcode,
 575     const char* msg,
 576     const char* relayState,
 577     const RoleDescriptor* role,
 578     const Application& application,
 579     HTTPResponse& httpResponse,
 580     bool front
 581     ) const
 582 {
 583     // Get endpoint and encoder to use.
 584     const EndpointType* ep = NULL;
 585     const MessageEncoder* encoder = NULL;
 586     if (front) {
 587         const IDPSSODescriptor* idp = dynamic_cast<const IDPSSODescriptor*>(role);
 588         for (vector<const XMLCh*>::const_iterator b = m_bindings.begin(); idp && b!=m_bindings.end(); ++b) {
 589             if (ep=EndpointManager<SingleLogoutService>(idp->getSingleLogoutServices()).getByBinding(*b)) {
 590                 map<const XMLCh*,MessageEncoder*>::const_iterator enc = m_encoders.find(*b);
 591                 if (enc!=m_encoders.end())
 592                     encoder = enc->second;
 593                 break;
 594             }
 595         }
 596         if (!ep || !encoder) {
 597             auto_ptr_char id(dynamic_cast<EntityDescriptor*>(role->getParent())->getEntityID());
 598             m_log.error("unable to locate compatible SLO service for provider (%s)", id.get());
 599             MetadataException ex("Unable to locate endpoint at IdP ($entityID) to send LogoutResponse.");
 600             annotateException(&ex, role);   // throws it
 601         }
 602     }
 603     else {
 604         encoder = m_encoders.begin()->second;
 605     }
 606
 607     // Prepare response.
 608     auto_ptr<LogoutResponse> logout(LogoutResponseBuilder::buildLogoutResponse());
 609     logout->setInResponseTo(requestID);
 610     if (ep) {
 611         const XMLCh* loc = ep->getResponseLocation();
 612         if (!loc || !*loc)
 613             loc = ep->getLocation();
 614         logout->setDestination(loc);
 615     }
 616     Issuer* issuer = IssuerBuilder::buildIssuer();
 617     logout->setIssuer(issuer);
 618     issuer->setName(application.getXMLString("entityID").second);
 619     fillStatus(*logout.get(), code, subcode, msg);
 620
 621     auto_ptr_char dest(logout->getDestination());
 622
 623     long ret = sendMessage(*encoder, logout.get(), relayState, dest.get(), role, application, httpResponse);
 624     logout.release();  // freed by encoder
 625     return make_pair(true,ret);
 626 }
 627
 628 #endif