SSPCPP-616 - clean up concatenated string literals
[shibboleth/cpp-sp.git] / shibsp / handler / impl / SAML2Logout.cpp
index c843897..cde5cbb 100644 (file)
@@ -1,22 +1,26 @@
-/*
- *  Copyright 2001-2009 Internet2
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
+/**
+ * Licensed to the University Corporation for Advanced Internet
+ * Development, Inc. (UCAID) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ *
+ * UCAID licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the
+ * License at
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ * http://www.apache.org/licenses/LICENSE-2.0
  *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
  */
 
 /**
  * SAML2Logout.cpp
- * 
+ *
  * Handles SAML 2.0 single logout protocol messages.
  */
 
@@ -24,6 +28,7 @@
 #include "exceptions.h"
 #include "Application.h"
 #include "ServiceProvider.h"
+#include "SPRequest.h"
 #include "handler/AbstractHandler.h"
 #include "handler/LogoutHandler.h"
 #include "util/SPConstants.h"
 #ifndef SHIBSP_LITE
 # include "SessionCacheEx.h"
 # include "security/SecurityPolicy.h"
+# include "security/SecurityPolicyProvider.h"
 # include "metadata/MetadataProviderCriteria.h"
-# include "util/TemplateParameters.h"
 # include <fstream>
+# include <boost/algorithm/string.hpp>
+# include <boost/iterator/indirect_iterator.hpp>
+# include <saml/exceptions.h>
 # include <saml/SAMLConfig.h>
 # include <saml/saml2/core/Protocols.h>
 # include <saml/saml2/metadata/EndpointManager.h>
+# include <saml/saml2/metadata/Metadata.h>
 # include <saml/saml2/metadata/MetadataCredentialCriteria.h>
 # include <xmltooling/util/URLEncoder.h>
 using namespace opensaml::saml2;
 using namespace opensaml::saml2p;
 using namespace opensaml::saml2md;
 using namespace opensaml;
+#else
+# include "lite/SAMLConstants.h"
 #endif
 
+#include <boost/scoped_ptr.hpp>
+
 using namespace shibsp;
 using namespace xmltooling;
+using namespace boost;
 using namespace std;
 
 namespace shibsp {
@@ -55,21 +69,13 @@ namespace shibsp {
     #pragma warning( push )
     #pragma warning( disable : 4250 )
 #endif
-    
+
     class SHIBSP_DLLLOCAL SAML2Logout : public AbstractHandler, public LogoutHandler
     {
     public:
         SAML2Logout(const DOMElement* e, const char* appId);
-        virtual ~SAML2Logout() {
-#ifndef SHIBSP_LITE
-            if (SPConfig::getConfig().isEnabled(SPConfig::OutOfProcess)) {
-                delete m_decoder;
-                XMLString::release(&m_outgoing);
-                for_each(m_encoders.begin(), m_encoders.end(), cleanup_pair<const XMLCh*,MessageEncoder>());
-            }
-#endif
-        }
-        
+        virtual ~SAML2Logout() {}
+
         void receive(DDF& in, ostream& out);
         pair<bool,long> run(SPRequest& request, bool isHandler=true) const;
 
@@ -92,12 +98,16 @@ namespace shibsp {
             return "SingleLogoutService";
         }
 #endif
+        const XMLCh* getProtocolFamily() const {
+            return samlconstants::SAML20P_NS;
+        }
 
     private:
         pair<bool,long> doRequest(const Application& application, const HTTPRequest& httpRequest, HTTPResponse& httpResponse) const;
 
 #ifndef SHIBSP_LITE
         pair<bool,long> sendResponse(
+            LogoutEvent* logoutEvent,
             const XMLCh* requestID,
             const XMLCh* code,
             const XMLCh* subcode,
@@ -109,11 +119,19 @@ namespace shibsp {
             bool front
             ) const;
 
-        xmltooling::QName m_role;
-        MessageDecoder* m_decoder;
-        XMLCh* m_outgoing;
-        vector<const XMLCh*> m_bindings;
-        map<const XMLCh*,MessageEncoder*> m_encoders;
+        LogoutEvent* newLogoutEvent(
+            const Application& application, const HTTPRequest* request=nullptr, const Session* session=nullptr
+            ) const {
+            LogoutEvent* e = LogoutHandler::newLogoutEvent(application, request, session);
+            if (e)
+                e->m_protocol = m_protocol.get();
+            return e;
+        }
+
+        scoped_ptr<MessageDecoder> m_decoder;
+        vector<string> m_bindings;
+        map< string,boost::shared_ptr<MessageEncoder> > m_encoders;
+        auto_ptr_char m_protocol;
 #endif
     };
 
@@ -128,13 +146,13 @@ namespace shibsp {
 };
 
 SAML2Logout::SAML2Logout(const DOMElement* e, const char* appId)
-    : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT".Logout.SAML2"))
+    : AbstractHandler(e, Category::getInstance(SHIBSP_LOGCAT ".Logout.SAML2"))
 #ifndef SHIBSP_LITE
-        ,m_role(samlconstants::SAML20MD_NS, IDPSSODescriptor::LOCAL_NAME), m_decoder(NULL), m_outgoing(NULL)
+        ,m_protocol(samlconstants::SAML20P_NS)
 #endif
 {
-#ifndef SHIBSP_LITE
     m_initiator = false;
+#ifndef SHIBSP_LITE
     m_preserve.push_back("ID");
     m_preserve.push_back("entityID");
     m_preserve.push_back("RelayState");
@@ -143,54 +161,52 @@ SAML2Logout::SAML2Logout(const DOMElement* e, const char* appId)
         SAMLConfig& conf = SAMLConfig::getConfig();
 
         // Handle incoming binding.
-        m_decoder = conf.MessageDecoderManager.newPlugin(
-            getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
+        m_decoder.reset(
+            conf.MessageDecoderManager.newPlugin(
+                getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
+                )
             );
         m_decoder->setArtifactResolver(SPConfig::getConfig().getArtifactResolver());
 
         if (m_decoder->isUserAgentPresent()) {
             // Handle front-channel binding setup.
-            pair<bool,const XMLCh*> outgoing = getXMLString("outgoingBindings", m_configNS.get());
+            string dupBindings;
+            pair<bool,const char*> outgoing = getString("outgoingBindings", m_configNS.get());
             if (outgoing.first) {
-                m_outgoing = XMLString::replicate(outgoing.second);
-                XMLString::trim(m_outgoing);
+                dupBindings = outgoing.second;
+                trim(dupBindings);
             }
             else {
                 // No override, so we'll install a default binding precedence.
-                string prec = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
+                dupBindings = string(samlconstants::SAML20_BINDING_HTTP_REDIRECT) + ' ' + samlconstants::SAML20_BINDING_HTTP_POST + ' ' +
                     samlconstants::SAML20_BINDING_HTTP_POST_SIMPLESIGN + ' ' + samlconstants::SAML20_BINDING_HTTP_ARTIFACT;
-                m_outgoing = XMLString::transcode(prec.c_str());
             }
 
-            int pos;
-            XMLCh* start = m_outgoing;
-            while (start && *start) {
-                pos = XMLString::indexOf(start,chSpace);
-                if (pos != -1)
-                    *(start + pos)=chNull;
-                m_bindings.push_back(start);
+            split(m_bindings, dupBindings, is_space(), algorithm::token_compress_on);
+            for (vector<string>::const_iterator b = m_bindings.begin(); b != m_bindings.end(); ++b) {
                 try {
-                    auto_ptr_char b(start);
-                    MessageEncoder * encoder = conf.MessageEncoderManager.newPlugin(
-                        b.get(), pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
+                    boost::shared_ptr<MessageEncoder> encoder(
+                        conf.MessageEncoderManager.newPlugin(*b, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS))
                         );
-                    m_encoders[start] = encoder;
-                    m_log.debug("supporting outgoing front-channel binding (%s)", b.get());
+                    if (encoder->isUserAgentPresent() && XMLString::equals(getProtocolFamily(), encoder->getProtocolFamily())) {
+                        m_encoders[*b] = encoder;
+                        m_log.debug("supporting outgoing binding (%s)", b->c_str());
+                    }
+                    else {
+                        m_log.warn("skipping outgoing binding (%s), not a SAML 2.0 front-channel mechanism", b->c_str());
+                    }
                 }
-                catch (exception& ex) {
+                catch (std::exception& ex) {
                     m_log.error("error building MessageEncoder: %s", ex.what());
                 }
-                if (pos != -1)
-                    start = start + pos + 1;
-                else
-                    break;
             }
         }
         else {
-            MessageEncoder* encoder = conf.MessageEncoderManager.newPlugin(
-                getString("Binding").second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS)
+            pair<bool,const char*> b = getString("Binding");
+            boost::shared_ptr<MessageEncoder> encoder(
+                conf.MessageEncoderManager.newPlugin(b.second, pair<const DOMElement*,const XMLCh*>(e,shibspconstants::SHIB2SPCONFIG_NS))
                 );
-            m_encoders.insert(pair<const XMLCh*,MessageEncoder*>(NULL, encoder));
+            m_encoders[b.second] = encoder;
         }
     }
 #endif
@@ -216,6 +232,7 @@ pair<bool,long> SAML2Logout::run(SPRequest& request, bool isHandler) const
     else {
         // When not out of process, we remote all the message processing.
         vector<string> headers(1,"Cookie");
+        headers.push_back("User-Agent");
         DDF out,in = wrap(request, &headers, true);
         DDFJanitor jin(in), jout(out);
         out=request.getServiceProvider().getListenerService()->send(in);
@@ -226,26 +243,26 @@ pair<bool,long> SAML2Logout::run(SPRequest& request, bool isHandler) const
 void SAML2Logout::receive(DDF& in, ostream& out)
 {
     // Find application.
-    const char* aid=in["application_id"].string();
-    const Application* app=aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : NULL;
+    const char* aid = in["application_id"].string();
+    const Application* app = aid ? SPConfig::getConfig().getServiceProvider()->getApplication(aid) : nullptr;
     if (!app) {
         // Something's horribly wrong.
         m_log.error("couldn't find application (%s) for logout", aid ? aid : "(missing)");
         throw ConfigurationException("Unable to locate application for logout, deleted?");
     }
-    
+
     // Unpack the request.
-    auto_ptr<HTTPRequest> req(getRequest(in));
+    scoped_ptr<HTTPRequest> req(getRequest(in));
 
     // Wrap a response shim.
-    DDF ret(NULL);
+    DDF ret(nullptr);
     DDFJanitor jout(ret);
-    auto_ptr<HTTPResponse> resp(getResponse(ret));
-    
+    scoped_ptr<HTTPResponse> resp(getResponse(ret));
+
     // Since we're remoted, the result should either be a throw, which we pass on,
     // a false/0 return, which we just return as an empty structure, or a response/redirect,
     // which we capture in the facade and send back.
-    doRequest(*app, *req.get(), *resp.get());
+    doRequest(*app, *req, *resp);
     out << ret;
 }
 
@@ -257,6 +274,10 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
     SessionCacheEx* cacheex = dynamic_cast<SessionCacheEx*>(cache);
     string session_id = cache->active(application, request);
 
+    scoped_ptr<LogoutEvent> logout_event(newLogoutEvent(application, &request));
+    if (logout_event.get() && !session_id.empty())
+        logout_event->m_sessions.push_back(session_id);
+
     if (!strcmp(request.getMethod(),"GET") && request.getParameter("notifying")) {
         // This is returning from a front-channel notification, so we have to do the back-channel and then
         // respond. To do that, we need state from the original request.
@@ -274,8 +295,8 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
                 cache->remove(application, request, &response);
                 worked2 = true;
             }
-            catch (exception& ex) {
-                m_log.error("error removing session (%s): %s", session_id, ex.what());
+            catch (std::exception& ex) {
+                m_log.error("error removing session (%s): %s", session_id.c_str(), ex.what());
             }
         }
         else {
@@ -285,11 +306,14 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
         // We need metadata to issue a response.
         MetadataProvider* m = application.getMetadataProvider();
         Locker metadataLocker(m);
-        MetadataProviderCriteria mc(application, request.getParameter("entityID"), &IDPSSODescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS);
+        MetadataProviderCriteria mc(
+            application, request.getParameter("entityID"), &IDPSSODescriptor::ELEMENT_QNAME, samlconstants::SAML20P_NS
+            );
         pair<const EntityDescriptor*,const RoleDescriptor*> entity = m->getEntityDescriptor(mc);
         if (!entity.first) {
             throw MetadataException(
-                "Unable to locate metadata for identity provider ($entityID)", namedparams(1, "entityID", request.getParameter("entityID"))
+                "Unable to locate metadata for identity provider ($entityID)",
+                namedparams(1, "entityID", request.getParameter("entityID"))
                 );
         }
         else if (!entity.second) {
@@ -302,14 +326,24 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
         auto_ptr_XMLCh reqid(request.getParameter("ID"));
         if (worked1 && worked2) {
             // Successful LogoutResponse. Has to be front-channel or we couldn't be here.
+            if (logout_event.get())
+                logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_GLOBAL;
             return sendResponse(
-                reqid.get(), StatusCode::SUCCESS, NULL, NULL, request.getParameter("RelayState"), entity.second, application, response, true
+                logout_event.get(),
+                reqid.get(),
+                StatusCode::SUCCESS, nullptr, nullptr,
+                request.getParameter("RelayState"),
+                entity.second,
+                application,
+                response,
+                true
                 );
         }
 
         return sendResponse(
+            logout_event.get(),
             reqid.get(),
-            StatusCode::RESPONDER, NULL, "Unable to fully destroy principal's session.",
+            StatusCode::RESPONDER, nullptr, "Unable to fully destroy principal's session.",
             request.getParameter("RelayState"),
             entity.second,
             application,
@@ -321,45 +355,40 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
     // If we get here, it's an external protocol message to decode.
 
     // Locate policy key.
-    pair<bool,const char*> policyId = getString("policyId", m_configNS.get());  // namespace-qualified if inside handler element
+    pair<bool,const char*> policyId = getString("policyId", m_configNS.get());  // may be namespace-qualified inside handler element
+    if (!policyId.first)
+        policyId = getString("policyId");   // try unqualified
     if (!policyId.first)
         policyId = application.getString("policyId");   // unqualified in Application(s) element
-        
-    // Access policy properties.
-    const PropertySet* settings = application.getServiceProvider().getPolicySettings(policyId.second);
-    pair<bool,bool> validate = settings->getBool("validate");
 
     // Lock metadata for use by policy.
     Locker metadataLocker(application.getMetadataProvider());
 
     // Create the policy.
-    shibsp::SecurityPolicy policy(application, &m_role, validate.first && validate.second);
-    
+    scoped_ptr<SecurityPolicy> policy(
+        application.getServiceProvider().getSecurityPolicyProvider()->createSecurityPolicy(application, &IDPSSODescriptor::ELEMENT_QNAME, policyId.second)
+        );
+
     // Decode the message.
     string relayState;
-    auto_ptr<XMLObject> msg(m_decoder->decode(relayState, request, policy));
+    scoped_ptr<XMLObject> msg(m_decoder->decode(relayState, request, *policy));
     const LogoutRequest* logoutRequest = dynamic_cast<LogoutRequest*>(msg.get());
     if (logoutRequest) {
-        if (!policy.isAuthenticated())
+        if (!policy->isAuthenticated())
             throw SecurityPolicyException("Security of LogoutRequest not established.");
 
-        // Message from IdP to logout one or more sessions.
-        
-        // If this is front-channel, we have to have a session_id to use already.
-        if (m_decoder->isUserAgentPresent() && session_id.empty()) {
-            m_log.error("no active session");
-            return sendResponse(
-                logoutRequest->getID(),
-                StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "No active session found in request.",
-                relayState.c_str(),
-                policy.getIssuerMetadata(),
-                application,
-                response,
-                true
-                );
+        if (logout_event) {
+            logout_event->m_saml2Request = logoutRequest;
+            if (policy->getIssuerMetadata())
+                logout_event->m_peer = dynamic_cast<const EntityDescriptor*>(policy->getIssuerMetadata()->getParent());
+            application.getServiceProvider().getTransactionLog()->write(*logout_event);
+            logout_event->m_saml2Request = nullptr;
         }
 
-        bool ownedName = false;
+        // Message from IdP to logout one or more sessions.
+        // Extract the NameID from the request, decrypting it if needed.
+
+        scoped_ptr<XMLObject> decryptedID;
         NameID* nameid = logoutRequest->getNameID();
         if (!nameid) {
             // Check for EncryptedID.
@@ -370,24 +399,23 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
                     m_log.warn("found encrypted NameID, but no decryption credential was available");
                 else {
                     Locker credlocker(cr);
-                    auto_ptr<MetadataCredentialCriteria> mcc(
-                        policy.getIssuerMetadata() ? new MetadataCredentialCriteria(*policy.getIssuerMetadata()) : NULL
+                    scoped_ptr<MetadataCredentialCriteria> mcc(
+                        policy->getIssuerMetadata() ? new MetadataCredentialCriteria(*policy->getIssuerMetadata()) : nullptr
                         );
                     try {
-                        auto_ptr<XMLObject> decryptedID(
+                        decryptedID.reset(
                             encname->decrypt(
                                 *cr,
-                                application.getRelyingParty(policy.getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy.getIssuerMetadata()->getParent()) : NULL)->getXMLString("entityID").second,
+                                application.getRelyingParty(
+                                    policy->getIssuerMetadata() ?
+                                        dynamic_cast<EntityDescriptor*>(policy->getIssuerMetadata()->getParent()) :
+                                            nullptr)->getXMLString("entityID").second,
                                 mcc.get()
                                 )
                             );
                         nameid = dynamic_cast<NameID*>(decryptedID.get());
-                        if (nameid) {
-                            ownedName = true;
-                            decryptedID.release();
-                        }
                     }
-                    catch (exception& ex) {
+                    catch (std::exception& ex) {
                         m_log.error(ex.what());
                     }
                 }
@@ -397,42 +425,46 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
             // No NameID, so must respond with an error.
             m_log.error("NameID not found in request");
             return sendResponse(
+                logout_event.get(),
                 logoutRequest->getID(),
                 StatusCode::REQUESTER, StatusCode::UNKNOWN_PRINCIPAL, "NameID not found in request.",
                 relayState.c_str(),
-                policy.getIssuerMetadata(),
+                policy->getIssuerMetadata(),
                 application,
                 response,
                 m_decoder->isUserAgentPresent()
                 );
         }
 
-        auto_ptr<NameID> namewrapper(ownedName ? nameid : NULL);
-
         // Suck indexes out of the request for next steps.
         set<string> indexes;
-        EntityDescriptor* entity = policy.getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy.getIssuerMetadata()->getParent()) : NULL;
+        EntityDescriptor* entity =
+            policy->getIssuerMetadata() ? dynamic_cast<EntityDescriptor*>(policy->getIssuerMetadata()->getParent()) : nullptr;
         const vector<SessionIndex*> sindexes = logoutRequest->getSessionIndexs();
-        for (vector<SessionIndex*>::const_iterator i = sindexes.begin(); i != sindexes.end(); ++i) {
-            auto_ptr_char sindex((*i)->getSessionIndex());
+        for (indirect_iterator<vector<SessionIndex*>::const_iterator> i = make_indirect_iterator(sindexes.begin());
+                i != make_indirect_iterator(sindexes.end()); ++i) {
+            auto_ptr_char sindex(i->getSessionIndex());
             indexes.insert(sindex.get());
         }
 
         // For a front-channel LogoutRequest, we have to match the information in the request
-        // against the current session.
+        // against the current session, if one is known/available.
         if (!session_id.empty()) {
             if (!cache->matches(application, request, entity, *nameid, &indexes)) {
                 return sendResponse(
+                    logout_event.get(),
                     logoutRequest->getID(),
                     StatusCode::REQUESTER, StatusCode::REQUEST_DENIED, "Active session did not match logout request.",
                     relayState.c_str(),
-                    policy.getIssuerMetadata(),
+                    policy->getIssuerMetadata(),
                     application,
                     response,
                     true
                     );
             }
-
+        }
+        else if (m_decoder->isUserAgentPresent()) {
+            m_log.info("processing front channel logout request with no active session");
         }
 
         // Now we perform "logout" by finding the matching sessions.
@@ -447,7 +479,7 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
                 // if this is front-channel, for notification purposes.
                 for (vector<string>::const_iterator sit = sessions.begin(); sit != sessions.end(); ++sit)
                     if (*sit != session_id)
-                        cacheex->remove(application, sit->c_str());   // using the ID-based removal operation
+                        cacheex->remove(application, sit->c_str()); // using the ID-based removal operation
             }
             else {
                 m_log.warn("session cache does not support extended API, can't implement indirect logout of sessions");
@@ -455,13 +487,19 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
                     sessions.push_back(session_id);
             }
         }
-        catch (exception& ex) {
+        catch (std::exception& ex) {
             m_log.error("error while logging out matching sessions: %s", ex.what());
+            if (logout_event) {
+                logout_event->m_nameID = nameid;
+                logout_event->m_sessions = sessions;
+                logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_PARTIAL;
+            }
             return sendResponse(
+                logout_event.get(),
                 logoutRequest->getID(),
-                StatusCode::RESPONDER, NULL, ex.what(),
+                StatusCode::RESPONDER, nullptr, ex.what(),
                 relayState.c_str(),
-                policy.getIssuerMetadata(),
+                policy->getIssuerMetadata(),
                 application,
                 response,
                 m_decoder->isUserAgentPresent()
@@ -469,42 +507,53 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
         }
 
         if (m_decoder->isUserAgentPresent()) {
-            // Pass control to the first front channel notification point, if any.
-            map<string,string> parammap;
-            if (!relayState.empty())
-                parammap["RelayState"] = relayState;
-            auto_ptr_char entityID(entity ? entity->getEntityID() : NULL);
-            if (entityID.get())
-                parammap["entityID"] = entityID.get();
-            auto_ptr_char reqID(logoutRequest->getID());
-            if (reqID.get())
-                parammap["ID"] = reqID.get();
-            pair<bool,long> result = notifyFrontChannel(application, request, response, &parammap);
-            if (result.first)
-                return result;
-        }
-        
-        // For back-channel requests, or if no front-channel notification is needed...
-        bool worked1 = false,worked2 = false;
-        worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
+            if (!session_id.empty()) {
+                // Pass control to the first front channel notification point, if any.
+                map<string,string> parammap;
+                if (!relayState.empty())
+                    parammap["RelayState"] = relayState;
+                auto_ptr_char entityID(entity ? entity->getEntityID() : nullptr);
+                if (entityID.get())
+                    parammap["entityID"] = entityID.get();
+                auto_ptr_char reqID(logoutRequest->getID());
+                if (reqID.get())
+                    parammap["ID"] = reqID.get();
+                pair<bool,long> result = notifyFrontChannel(application, request, response, &parammap);
+                if (result.first)
+                    return result;
+            }
+            else {
+                m_log.info("client's session isn't available, skipping front-channel notifications");
+            }
+        }
+
+        // For back-channel requests, or if no front-channel notification is needed or possible...
+        bool worked1 = notifyBackChannel(application, request.getRequestURL(), sessions, false);
+        bool worked2 = true;
         if (!session_id.empty()) {
             // One last session to yoink...
             try {
                 cache->remove(application, request, &response);
-                worked2 = true;
             }
-            catch (exception& ex) {
+            catch (std::exception& ex) {
+                worked2 = false;
                 m_log.error("error removing active session (%s): %s", session_id.c_str(), ex.what());
             }
         }
 
+        if (logout_event) {
+            logout_event->m_nameID = nameid;
+            logout_event->m_sessions = sessions;
+            logout_event->m_logoutType = (worked1 && worked2) ? LogoutEvent::LOGOUT_EVENT_PARTIAL : LogoutEvent::LOGOUT_EVENT_GLOBAL;
+        }
         return sendResponse(
+            logout_event.get(),
             logoutRequest->getID(),
             (worked1 && worked2) ? StatusCode::SUCCESS : StatusCode::RESPONDER,
-            (worked1 && worked2) ? NULL : StatusCode::PARTIAL_LOGOUT,
-            NULL,
+            (worked1 && worked2) ? nullptr : StatusCode::PARTIAL_LOGOUT,
+            nullptr,
             relayState.c_str(),
-            policy.getIssuerMetadata(),
+            policy->getIssuerMetadata(),
             application,
             response,
             m_decoder->isUserAgentPresent()
@@ -514,27 +563,59 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
     // A LogoutResponse completes an SP-initiated logout sequence.
     const LogoutResponse* logoutResponse = dynamic_cast<LogoutResponse*>(msg.get());
     if (logoutResponse) {
-        if (!policy.isAuthenticated()) {
+        if (!policy->isAuthenticated()) {
             SecurityPolicyException ex("Security of LogoutResponse not established.");
-            if (policy.getIssuerMetadata())
-                annotateException(&ex, policy.getIssuerMetadata()); // throws it
-            ex.raise();
+            annotateException(&ex, policy->getIssuerMetadata()); // throws it
+        }
+        if (logout_event) {
+            logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_PARTIAL;
+            logout_event->m_saml2Response = logoutResponse;
+            if (policy->getIssuerMetadata())
+                logout_event->m_peer = dynamic_cast<const EntityDescriptor*>(policy->getIssuerMetadata()->getParent());
+        }
+
+        try {
+            checkError(logoutResponse, policy->getIssuerMetadata()); // throws if Status doesn't look good...
+        }
+        catch (std::exception& ex) {
+            if (logout_event) {
+                logout_event->m_exception = &ex;
+                application.getServiceProvider().getTransactionLog()->write(*logout_event);
+            }
+            throw;
         }
-        checkError(logoutResponse, policy.getIssuerMetadata()); // throws if Status doesn't look good...
 
         // If relay state is set, recover the original return URL.
         if (!relayState.empty())
             recoverRelayState(application, request, response, relayState);
-        if (!relayState.empty())
+
+        // Check for partial logout.
+        const StatusCode* sc = logoutResponse->getStatus() ? logoutResponse->getStatus()->getStatusCode() : nullptr;
+        sc = sc ? sc->getStatusCode() : nullptr;
+        if (sc && XMLString::equals(sc->getValue(), StatusCode::PARTIAL_LOGOUT)) {
+            if (logout_event)
+                application.getServiceProvider().getTransactionLog()->write(*logout_event);
+            return sendLogoutPage(application, request, response, "partial");
+        }
+
+        if (logout_event) {
+            logout_event->m_logoutType = LogoutEvent::LOGOUT_EVENT_GLOBAL;
+            application.getServiceProvider().getTransactionLog()->write(*logout_event);
+        }
+
+        if (!relayState.empty()) {
+            application.limitRedirect(request, relayState.c_str());
             return make_pair(true, response.sendRedirect(relayState.c_str()));
+        }
 
-        // Return template for completion of global logout, or redirect to homeURL.
-        return sendLogoutPage(application, request, response, false, "Global logout completed.");
+        // Return template for completion of logout.
+        return sendLogoutPage(application, request, response, "global");
     }
 
     FatalProfileException ex("Incoming message was not a samlp:LogoutRequest or samlp:LogoutResponse.");
-    if (policy.getIssuerMetadata())
-        annotateException(&ex, policy.getIssuerMetadata()); // throws it
+    if (policy->getIssuerMetadata())
+        annotateException(&ex, policy->getIssuerMetadata()); // throws it
     ex.raise();
     return make_pair(false,0L);  // never happen, satisfies compiler
 #else
@@ -545,6 +626,7 @@ pair<bool,long> SAML2Logout::doRequest(const Application& application, const HTT
 #ifndef SHIBSP_LITE
 
 pair<bool,long> SAML2Logout::sendResponse(
+    LogoutEvent* logoutEvent,
     const XMLCh* requestID,
     const XMLCh* code,
     const XMLCh* subcode,
@@ -557,15 +639,16 @@ pair<bool,long> SAML2Logout::sendResponse(
     ) const
 {
     // Get endpoint and encoder to use.
-    const EndpointType* ep = NULL;
-    const MessageEncoder* encoder = NULL;
+    const EndpointType* ep = nullptr;
+    const MessageEncoder* encoder = nullptr;
     if (front) {
         const IDPSSODescriptor* idp = dynamic_cast<const IDPSSODescriptor*>(role);
-        for (vector<const XMLCh*>::const_iterator b = m_bindings.begin(); idp && b!=m_bindings.end(); ++b) {
-            if (ep=EndpointManager<SingleLogoutService>(idp->getSingleLogoutServices()).getByBinding(*b)) {
-                map<const XMLCh*,MessageEncoder*>::const_iterator enc = m_encoders.find(*b);
-                if (enc!=m_encoders.end())
-                    encoder = enc->second;
+        for (vector<string>::const_iterator b = m_bindings.begin(); idp && b != m_bindings.end(); ++b) {
+            auto_ptr_XMLCh wideb(b->c_str());
+            if ((ep = EndpointManager<SingleLogoutService>(idp->getSingleLogoutServices()).getByBinding(wideb.get()))) {
+                map< string,boost::shared_ptr<MessageEncoder> >::const_iterator enc = m_encoders.find(*b);
+                if (enc != m_encoders.end())
+                    encoder = enc->second.get();
                 break;
             }
         }
@@ -577,7 +660,7 @@ pair<bool,long> SAML2Logout::sendResponse(
         }
     }
     else {
-        encoder = m_encoders.begin()->second;
+        encoder = m_encoders.begin()->second.get();
     }
 
     // Prepare response.
@@ -592,13 +675,22 @@ pair<bool,long> SAML2Logout::sendResponse(
     Issuer* issuer = IssuerBuilder::buildIssuer();
     logout->setIssuer(issuer);
     issuer->setName(application.getRelyingParty(dynamic_cast<EntityDescriptor*>(role->getParent()))->getXMLString("entityID").second);
-    fillStatus(*logout.get(), code, subcode, msg);
+    fillStatus(*logout, code, subcode, msg);
+    XMLCh* msgid = SAMLConfig::getConfig().generateIdentifier();
+    logout->setID(msgid);
+    XMLString::release(&msgid);
+    logout->setIssueInstant(time(nullptr));
+
+    if (logoutEvent) {
+        logoutEvent->m_peer = dynamic_cast<EntityDescriptor*>(role->getParent());
+        logoutEvent->m_saml2Response = logout.get();
+        application.getServiceProvider().getTransactionLog()->write(*logoutEvent);
+    }
 
     auto_ptr_char dest(logout->getDestination());
-
-    long ret = sendMessage(*encoder, logout.get(), relayState, dest.get(), role, application, httpResponse);
+    long ret = sendMessage(*encoder, logout.get(), relayState, dest.get(), role, application, httpResponse, front);
     logout.release();  // freed by encoder
-    return make_pair(true,ret);
+    return make_pair(true, ret);
 }
 
 #endif