2 * Copyright 2001-2010 Internet2
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 * ChainingMetadataProvider.cpp
20 * MetadataProvider that uses multiple providers in sequence.
24 #include "exceptions.h"
25 #include "saml/binding/SAMLArtifact.h"
26 #include "saml2/metadata/Metadata.h"
27 #include "saml2/metadata/DiscoverableMetadataProvider.h"
28 #include "saml2/metadata/ObservableMetadataProvider.h"
29 #include "saml2/metadata/MetadataCredentialCriteria.h"
32 #include <xercesc/util/XMLUniDefs.hpp>
33 #include <xmltooling/logging.h>
34 #include <xmltooling/util/Threads.h>
35 #include <xmltooling/util/XMLHelper.h>
38 using namespace opensaml::saml2md;
39 using namespace opensaml;
40 using namespace xmlsignature;
41 using namespace xmltooling::logging;
42 using namespace xmltooling;
48 // per-thread structure allocated to track locks and role->provider mappings
49 struct SAML_DLLLOCAL tracker_t;
51 class SAML_DLLLOCAL ChainingMetadataProvider
52 : public DiscoverableMetadataProvider, public ObservableMetadataProvider, public ObservableMetadataProvider::Observer {
54 ChainingMetadataProvider(const xercesc::DOMElement* e=nullptr);
55 virtual ~ChainingMetadataProvider();
57 using MetadataProvider::getEntityDescriptor;
58 using MetadataProvider::getEntitiesDescriptor;
63 const XMLObject* getMetadata() const;
64 const EntitiesDescriptor* getEntitiesDescriptor(const char* name, bool requireValidMetadata=true) const;
65 pair<const EntityDescriptor*,const RoleDescriptor*> getEntityDescriptor(const Criteria& criteria) const;
67 const Credential* resolve(const CredentialCriteria* criteria=nullptr) const;
68 vector<const Credential*>::size_type resolve(vector<const Credential*>& results, const CredentialCriteria* criteria=nullptr) const;
70 string getCacheTag() const {
71 Lock lock(m_trackerLock);
75 ostream& outputFeed(ostream& os) const {
77 // Lock each provider in turn and suck in its feed.
78 for (vector<MetadataProvider*>::const_iterator m = m_providers.begin(); m != m_providers.end(); ++m) {
79 if (m != m_providers.begin())
81 DiscoverableMetadataProvider* d = dynamic_cast<DiscoverableMetadataProvider*>(*m);
91 void onEvent(const ObservableMetadataProvider& provider) const {
92 // Reset the cache tag for the feed.
93 Lock lock(m_trackerLock);
94 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
95 m_feedTag = SAMLArtifact::toHex(m_feedTag);
100 void generateFeed() {
106 mutable Mutex* m_trackerLock;
108 vector<MetadataProvider*> m_providers;
109 mutable set<tracker_t*> m_trackers;
110 static void tracker_cleanup(void*);
112 friend struct tracker_t;
115 struct SAML_DLLLOCAL tracker_t {
116 tracker_t(const ChainingMetadataProvider* m) : m_metadata(m) {
117 Lock lock(m_metadata->m_trackerLock);
118 m_metadata->m_trackers.insert(this);
121 void lock_if(MetadataProvider* m) {
122 if (m_locked.count(m) == 0)
126 void unlock_if(MetadataProvider* m) {
127 if (m_locked.count(m) == 0)
131 void remember(MetadataProvider* m, const EntityDescriptor* entity=nullptr) {
134 m_objectMap.insert(pair<const XMLObject*,const MetadataProvider*>(entity,m));
137 const MetadataProvider* getProvider(const RoleDescriptor& role) {
138 map<const XMLObject*,const MetadataProvider*>::const_iterator i = m_objectMap.find(role.getParent());
139 return (i != m_objectMap.end()) ? i->second : nullptr;
142 const ChainingMetadataProvider* m_metadata;
143 set<MetadataProvider*> m_locked;
144 map<const XMLObject*,const MetadataProvider*> m_objectMap;
147 MetadataProvider* SAML_DLLLOCAL ChainingMetadataProviderFactory(const DOMElement* const & e)
149 return new ChainingMetadataProvider(e);
152 static const XMLCh _MetadataProvider[] = UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
153 static const XMLCh precedence[] = UNICODE_LITERAL_10(p,r,e,c,e,d,e,n,c,e);
154 static const XMLCh last[] = UNICODE_LITERAL_4(l,a,s,t);
155 static const XMLCh _type[] = UNICODE_LITERAL_4(t,y,p,e);
159 void ChainingMetadataProvider::tracker_cleanup(void* ptr)
162 // free the tracker after removing it from the parent plugin's tracker set
163 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
164 Lock lock(t->m_metadata->m_trackerLock);
165 t->m_metadata->m_trackers.erase(t);
170 ChainingMetadataProvider::ChainingMetadataProvider(const DOMElement* e)
171 : ObservableMetadataProvider(e), m_firstMatch(true), m_trackerLock(nullptr), m_tlsKey(nullptr),
172 m_log(Category::getInstance(SAML_LOGCAT".Metadata.Chaining"))
174 if (XMLString::equals(e ? e->getAttributeNS(nullptr, precedence) : nullptr, last))
175 m_firstMatch = false;
177 e = XMLHelper::getFirstChildElement(e, _MetadataProvider);
179 string t = XMLHelper::getAttrString(e, nullptr, _type);
182 m_log.info("building MetadataProvider of type %s", t.c_str());
183 auto_ptr<MetadataProvider> provider(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(t.c_str(), e));
184 ObservableMetadataProvider* obs = dynamic_cast<ObservableMetadataProvider*>(provider.get());
186 obs->addObserver(this);
187 m_providers.push_back(provider.get());
190 catch (exception& ex) {
191 m_log.error("error building MetadataProvider: %s", ex.what());
194 e = XMLHelper::getNextSiblingElement(e, _MetadataProvider);
196 m_trackerLock = Mutex::create();
197 m_tlsKey = ThreadKey::create(tracker_cleanup);
200 ChainingMetadataProvider::~ChainingMetadataProvider()
203 delete m_trackerLock;
204 for_each(m_trackers.begin(), m_trackers.end(), xmltooling::cleanup<tracker_t>());
205 for_each(m_providers.begin(), m_providers.end(), xmltooling::cleanup<MetadataProvider>());
208 void ChainingMetadataProvider::init()
210 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
214 catch (exception& ex) {
215 m_log.crit("failure initializing MetadataProvider: %s", ex.what());
219 // Set an initial cache tag for the state of the plugins.
220 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
221 m_feedTag = SAMLArtifact::toHex(m_feedTag);
224 Lockable* ChainingMetadataProvider::lock()
226 return this; // we're not lockable ourselves...
229 void ChainingMetadataProvider::unlock()
231 // Check for locked providers and remove role mappings.
232 void* ptr=m_tlsKey->getData();
234 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
235 for_each(t->m_locked.begin(), t->m_locked.end(), mem_fun<void,Lockable>(&Lockable::unlock));
237 t->m_objectMap.clear();
241 const XMLObject* ChainingMetadataProvider::getMetadata() const
243 throw MetadataException("getMetadata operation not implemented on this provider.");
246 const EntitiesDescriptor* ChainingMetadataProvider::getEntitiesDescriptor(const char* name, bool requireValidMetadata) const
248 // Ensure we have a tracker to use.
249 tracker_t* tracker = nullptr;
250 void* ptr=m_tlsKey->getData();
252 tracker = reinterpret_cast<tracker_t*>(ptr);
255 tracker = new tracker_t(this);
256 m_tlsKey->setData(tracker);
259 MetadataProvider* held = nullptr;
260 const EntitiesDescriptor* ret = nullptr;
261 const EntitiesDescriptor* cur = nullptr;
262 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
263 tracker->lock_if(*i);
264 if (cur=(*i)->getEntitiesDescriptor(name,requireValidMetadata)) {
265 // Are we using a first match policy?
267 // Save locked provider.
268 tracker->remember(*i);
272 // Using last match wins. Did we already have one?
274 m_log.warn("found duplicate EntitiesDescriptor (%s), using last matching copy", name);
275 tracker->unlock_if(held);
278 // Save off the latest match.
283 // No match, so just unlock this one and move on.
284 tracker->unlock_if(*i);
288 // Preserve any lock we're holding.
290 tracker->remember(held);
294 pair<const EntityDescriptor*,const RoleDescriptor*> ChainingMetadataProvider::getEntityDescriptor(const Criteria& criteria) const
296 // Ensure we have a tracker to use.
297 tracker_t* tracker = nullptr;
298 void* ptr=m_tlsKey->getData();
300 tracker = reinterpret_cast<tracker_t*>(ptr);
303 tracker = new tracker_t(this);
304 m_tlsKey->setData(tracker);
308 MetadataProvider* held = nullptr;
309 pair<const EntityDescriptor*,const RoleDescriptor*> ret = pair<const EntityDescriptor*,const RoleDescriptor*>(nullptr,nullptr);
310 pair<const EntityDescriptor*,const RoleDescriptor*> cur = ret;
311 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
312 tracker->lock_if(*i);
313 cur = (*i)->getEntityDescriptor(criteria);
316 // We want a role also. Did we find one?
318 // Are we using a first match policy?
320 // We could have an entity-only match from earlier, so unlock it.
322 tracker->unlock_if(held);
323 // Save locked provider and role mapping.
324 tracker->remember(*i, cur.first);
328 // Using last match wins. Did we already have one?
331 // We had a "complete" match, so log it.
332 if (criteria.entityID_ascii) {
333 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
334 criteria.entityID_ascii, criteria.role->toString().c_str());
336 else if (criteria.entityID_unicode) {
337 auto_ptr_char temp(criteria.entityID_unicode);
338 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
339 temp.get(), criteria.role->toString().c_str());
341 else if (criteria.artifact) {
342 m_log.warn("found duplicate EntityDescriptor for artifact source (%s) with role (%s), using last matching copy",
343 criteria.artifact->getSource().c_str(), criteria.role->toString().c_str());
346 tracker->unlock_if(held);
349 // Save off the latest match.
354 // We didn't find the role, so we're going to keep looking,
355 // but save this one if we didn't have the role yet.
357 // We already had a role, so let's stick with that.
358 tracker->unlock_if(*i);
361 // This is at least as good, so toss anything we had and keep it.
363 tracker->unlock_if(held);
370 // Are we using a first match policy?
372 // I don't think this can happen, but who cares, check anyway.
374 tracker->unlock_if(held);
376 // Save locked provider.
377 tracker->remember(*i, cur.first);
381 // Using last match wins. Did we already have one?
383 if (criteria.entityID_ascii) {
384 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", criteria.entityID_ascii);
386 else if (criteria.entityID_unicode) {
387 auto_ptr_char temp(criteria.entityID_unicode);
388 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", temp.get());
390 else if (criteria.artifact) {
391 m_log.warn("found duplicate EntityDescriptor for artifact source (%s), using last matching copy",
392 criteria.artifact->getSource().c_str());
394 tracker->unlock_if(held);
397 // Save off the latest match.
403 // No match, so just unlock this one and move on.
404 tracker->unlock_if(*i);
408 // Preserve any lock we're holding.
410 tracker->remember(held, ret.first);
414 const Credential* ChainingMetadataProvider::resolve(const CredentialCriteria* criteria) const
416 void* ptr=m_tlsKey->getData();
418 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
419 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
421 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
423 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
424 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
426 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
427 return m->resolve(mcc);
430 vector<const Credential*>::size_type ChainingMetadataProvider::resolve(
431 vector<const Credential*>& results, const CredentialCriteria* criteria
434 void* ptr=m_tlsKey->getData();
436 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
437 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
439 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
441 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
442 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
444 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
445 return m->resolve(results, mcc);