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22 * ChainingMetadataProvider.cpp
24 * MetadataProvider that uses multiple providers in sequence.
28 #include "exceptions.h"
29 #include "saml/binding/SAMLArtifact.h"
30 #include "saml2/metadata/Metadata.h"
31 #include "saml2/metadata/DiscoverableMetadataProvider.h"
32 #include "saml2/metadata/ObservableMetadataProvider.h"
33 #include "saml2/metadata/MetadataCredentialCriteria.h"
37 #include <xercesc/util/XMLUniDefs.hpp>
38 #include <xmltooling/logging.h>
39 #include <xmltooling/util/Threads.h>
40 #include <xmltooling/util/XMLHelper.h>
43 using namespace opensaml::saml2md;
44 using namespace opensaml;
45 using namespace xmlsignature;
46 using namespace xmltooling::logging;
47 using namespace xmltooling;
53 // per-thread structure allocated to track locks and role->provider mappings
54 struct SAML_DLLLOCAL tracker_t;
56 class SAML_DLLLOCAL ChainingMetadataProvider
57 : public DiscoverableMetadataProvider, public ObservableMetadataProvider, public ObservableMetadataProvider::Observer {
59 ChainingMetadataProvider(const xercesc::DOMElement* e=nullptr);
60 virtual ~ChainingMetadataProvider();
62 using MetadataProvider::getEntityDescriptor;
63 using MetadataProvider::getEntitiesDescriptor;
68 void outputStatus(ostream& os) const;
69 const XMLObject* getMetadata() const;
70 const EntitiesDescriptor* getEntitiesDescriptor(const char* name, bool requireValidMetadata=true) const;
71 pair<const EntityDescriptor*,const RoleDescriptor*> getEntityDescriptor(const Criteria& criteria) const;
73 const Credential* resolve(const CredentialCriteria* criteria=nullptr) const;
74 vector<const Credential*>::size_type resolve(vector<const Credential*>& results, const CredentialCriteria* criteria=nullptr) const;
76 string getCacheTag() const {
77 Lock lock(m_trackerLock);
81 void outputFeed(ostream& os, bool& first, bool wrapArray=true) const {
84 // Lock each provider in turn and suck in its feed.
85 for (vector<MetadataProvider*>::const_iterator m = m_providers.begin(); m != m_providers.end(); ++m) {
86 DiscoverableMetadataProvider* d = dynamic_cast<DiscoverableMetadataProvider*>(*m);
89 d->outputFeed(os, first, false);
96 void onEvent(const ObservableMetadataProvider& provider) const {
97 // Reset the cache tag for the feed.
98 Lock lock(m_trackerLock);
99 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
100 m_feedTag = SAMLArtifact::toHex(m_feedTag);
105 void generateFeed() {
111 mutable Mutex* m_trackerLock;
113 vector<MetadataProvider*> m_providers;
114 mutable set<tracker_t*> m_trackers;
115 static void tracker_cleanup(void*);
117 friend struct tracker_t;
120 struct SAML_DLLLOCAL tracker_t {
121 tracker_t(const ChainingMetadataProvider* m) : m_metadata(m) {
122 Lock lock(m_metadata->m_trackerLock);
123 m_metadata->m_trackers.insert(this);
126 void lock_if(MetadataProvider* m) {
127 if (m_locked.count(m) == 0)
131 void unlock_if(MetadataProvider* m) {
132 if (m_locked.count(m) == 0)
136 void remember(MetadataProvider* m, const EntityDescriptor* entity=nullptr) {
139 m_objectMap.insert(pair<const XMLObject*,const MetadataProvider*>(entity,m));
142 const MetadataProvider* getProvider(const RoleDescriptor& role) {
143 map<const XMLObject*,const MetadataProvider*>::const_iterator i = m_objectMap.find(role.getParent());
144 return (i != m_objectMap.end()) ? i->second : nullptr;
147 const ChainingMetadataProvider* m_metadata;
148 set<MetadataProvider*> m_locked;
149 map<const XMLObject*,const MetadataProvider*> m_objectMap;
152 MetadataProvider* SAML_DLLLOCAL ChainingMetadataProviderFactory(const DOMElement* const & e)
154 return new ChainingMetadataProvider(e);
157 static const XMLCh _MetadataProvider[] = UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
158 static const XMLCh precedence[] = UNICODE_LITERAL_10(p,r,e,c,e,d,e,n,c,e);
159 static const XMLCh last[] = UNICODE_LITERAL_4(l,a,s,t);
160 static const XMLCh _type[] = UNICODE_LITERAL_4(t,y,p,e);
164 void ChainingMetadataProvider::tracker_cleanup(void* ptr)
167 // free the tracker after removing it from the parent plugin's tracker set
168 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
169 Lock lock(t->m_metadata->m_trackerLock);
170 t->m_metadata->m_trackers.erase(t);
175 ChainingMetadataProvider::ChainingMetadataProvider(const DOMElement* e)
176 : ObservableMetadataProvider(e), m_firstMatch(true), m_trackerLock(nullptr), m_tlsKey(nullptr),
177 m_log(Category::getInstance(SAML_LOGCAT".Metadata.Chaining"))
179 if (XMLString::equals(e ? e->getAttributeNS(nullptr, precedence) : nullptr, last))
180 m_firstMatch = false;
182 e = XMLHelper::getFirstChildElement(e, _MetadataProvider);
184 string t = XMLHelper::getAttrString(e, nullptr, _type);
187 m_log.info("building MetadataProvider of type %s", t.c_str());
188 auto_ptr<MetadataProvider> provider(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(t.c_str(), e));
189 ObservableMetadataProvider* obs = dynamic_cast<ObservableMetadataProvider*>(provider.get());
191 obs->addObserver(this);
192 m_providers.push_back(provider.get());
195 catch (exception& ex) {
196 m_log.error("error building MetadataProvider: %s", ex.what());
199 e = XMLHelper::getNextSiblingElement(e, _MetadataProvider);
201 m_trackerLock = Mutex::create();
202 m_tlsKey = ThreadKey::create(tracker_cleanup);
205 ChainingMetadataProvider::~ChainingMetadataProvider()
208 delete m_trackerLock;
209 for_each(m_trackers.begin(), m_trackers.end(), xmltooling::cleanup<tracker_t>());
210 for_each(m_providers.begin(), m_providers.end(), xmltooling::cleanup<MetadataProvider>());
213 void ChainingMetadataProvider::init()
215 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
219 catch (exception& ex) {
220 m_log.crit("failure initializing MetadataProvider: %s", ex.what());
224 // Set an initial cache tag for the state of the plugins.
225 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
226 m_feedTag = SAMLArtifact::toHex(m_feedTag);
229 void ChainingMetadataProvider::outputStatus(ostream& os) const
231 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
232 (*i)->outputStatus(os);
236 Lockable* ChainingMetadataProvider::lock()
238 return this; // we're not lockable ourselves...
241 void ChainingMetadataProvider::unlock()
243 // Check for locked providers and remove role mappings.
244 void* ptr=m_tlsKey->getData();
246 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
247 for_each(t->m_locked.begin(), t->m_locked.end(), mem_fun<void,Lockable>(&Lockable::unlock));
249 t->m_objectMap.clear();
253 const XMLObject* ChainingMetadataProvider::getMetadata() const
255 throw MetadataException("getMetadata operation not implemented on this provider.");
258 const EntitiesDescriptor* ChainingMetadataProvider::getEntitiesDescriptor(const char* name, bool requireValidMetadata) const
260 // Ensure we have a tracker to use.
261 tracker_t* tracker = nullptr;
262 void* ptr=m_tlsKey->getData();
264 tracker = reinterpret_cast<tracker_t*>(ptr);
267 tracker = new tracker_t(this);
268 m_tlsKey->setData(tracker);
271 MetadataProvider* held = nullptr;
272 const EntitiesDescriptor* ret = nullptr;
273 const EntitiesDescriptor* cur = nullptr;
274 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
275 tracker->lock_if(*i);
276 if (cur=(*i)->getEntitiesDescriptor(name,requireValidMetadata)) {
277 // Are we using a first match policy?
279 // Save locked provider.
280 tracker->remember(*i);
284 // Using last match wins. Did we already have one?
286 m_log.warn("found duplicate EntitiesDescriptor (%s), using last matching copy", name);
287 tracker->unlock_if(held);
290 // Save off the latest match.
295 // No match, so just unlock this one and move on.
296 tracker->unlock_if(*i);
300 // Preserve any lock we're holding.
302 tracker->remember(held);
306 pair<const EntityDescriptor*,const RoleDescriptor*> ChainingMetadataProvider::getEntityDescriptor(const Criteria& criteria) const
308 // Ensure we have a tracker to use.
309 tracker_t* tracker = nullptr;
310 void* ptr=m_tlsKey->getData();
312 tracker = reinterpret_cast<tracker_t*>(ptr);
315 tracker = new tracker_t(this);
316 m_tlsKey->setData(tracker);
320 MetadataProvider* held = nullptr;
321 pair<const EntityDescriptor*,const RoleDescriptor*> ret = pair<const EntityDescriptor*,const RoleDescriptor*>(nullptr,nullptr);
322 pair<const EntityDescriptor*,const RoleDescriptor*> cur = ret;
323 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
324 tracker->lock_if(*i);
325 cur = (*i)->getEntityDescriptor(criteria);
328 // We want a role also. Did we find one?
330 // Are we using a first match policy?
332 // We could have an entity-only match from earlier, so unlock it.
334 tracker->unlock_if(held);
335 // Save locked provider and role mapping.
336 tracker->remember(*i, cur.first);
340 // Using last match wins. Did we already have one?
343 // We had a "complete" match, so log it.
344 if (criteria.entityID_ascii) {
345 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
346 criteria.entityID_ascii, criteria.role->toString().c_str());
348 else if (criteria.entityID_unicode) {
349 auto_ptr_char temp(criteria.entityID_unicode);
350 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
351 temp.get(), criteria.role->toString().c_str());
353 else if (criteria.artifact) {
354 m_log.warn("found duplicate EntityDescriptor for artifact source (%s) with role (%s), using last matching copy",
355 criteria.artifact->getSource().c_str(), criteria.role->toString().c_str());
358 tracker->unlock_if(held);
361 // Save off the latest match.
366 // We didn't find the role, so we're going to keep looking,
367 // but save this one if we didn't have the role yet.
369 // We already had a role, so let's stick with that.
370 tracker->unlock_if(*i);
373 // This is at least as good, so toss anything we had and keep it.
375 tracker->unlock_if(held);
382 // Are we using a first match policy?
384 // I don't think this can happen, but who cares, check anyway.
386 tracker->unlock_if(held);
388 // Save locked provider.
389 tracker->remember(*i, cur.first);
393 // Using last match wins. Did we already have one?
395 if (criteria.entityID_ascii) {
396 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", criteria.entityID_ascii);
398 else if (criteria.entityID_unicode) {
399 auto_ptr_char temp(criteria.entityID_unicode);
400 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", temp.get());
402 else if (criteria.artifact) {
403 m_log.warn("found duplicate EntityDescriptor for artifact source (%s), using last matching copy",
404 criteria.artifact->getSource().c_str());
406 tracker->unlock_if(held);
409 // Save off the latest match.
415 // No match, so just unlock this one and move on.
416 tracker->unlock_if(*i);
420 // Preserve any lock we're holding.
422 tracker->remember(held, ret.first);
426 const Credential* ChainingMetadataProvider::resolve(const CredentialCriteria* criteria) const
428 void* ptr=m_tlsKey->getData();
430 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
431 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
433 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
435 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
436 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
438 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
439 return m->resolve(mcc);
442 vector<const Credential*>::size_type ChainingMetadataProvider::resolve(
443 vector<const Credential*>& results, const CredentialCriteria* criteria
446 void* ptr=m_tlsKey->getData();
448 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
449 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
451 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
453 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
454 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
456 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
457 return m->resolve(results, mcc);