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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"
36 #include <xercesc/util/XMLUniDefs.hpp>
37 #include <xmltooling/logging.h>
38 #include <xmltooling/util/Threads.h>
39 #include <xmltooling/util/XMLHelper.h>
42 using namespace opensaml::saml2md;
43 using namespace opensaml;
44 using namespace xmlsignature;
45 using namespace xmltooling::logging;
46 using namespace xmltooling;
52 // per-thread structure allocated to track locks and role->provider mappings
53 struct SAML_DLLLOCAL tracker_t;
55 class SAML_DLLLOCAL ChainingMetadataProvider
56 : public DiscoverableMetadataProvider, public ObservableMetadataProvider, public ObservableMetadataProvider::Observer {
58 ChainingMetadataProvider(const xercesc::DOMElement* e=nullptr);
59 virtual ~ChainingMetadataProvider();
61 using MetadataProvider::getEntityDescriptor;
62 using MetadataProvider::getEntitiesDescriptor;
67 const XMLObject* getMetadata() const;
68 const EntitiesDescriptor* getEntitiesDescriptor(const char* name, bool requireValidMetadata=true) const;
69 pair<const EntityDescriptor*,const RoleDescriptor*> getEntityDescriptor(const Criteria& criteria) const;
71 const Credential* resolve(const CredentialCriteria* criteria=nullptr) const;
72 vector<const Credential*>::size_type resolve(vector<const Credential*>& results, const CredentialCriteria* criteria=nullptr) const;
74 string getCacheTag() const {
75 Lock lock(m_trackerLock);
79 void outputFeed(ostream& os, bool& first, bool wrapArray=true) const {
82 // Lock each provider in turn and suck in its feed.
83 for (vector<MetadataProvider*>::const_iterator m = m_providers.begin(); m != m_providers.end(); ++m) {
84 DiscoverableMetadataProvider* d = dynamic_cast<DiscoverableMetadataProvider*>(*m);
87 d->outputFeed(os, first, false);
94 void onEvent(const ObservableMetadataProvider& provider) const {
95 // Reset the cache tag for the feed.
96 Lock lock(m_trackerLock);
97 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
98 m_feedTag = SAMLArtifact::toHex(m_feedTag);
103 void generateFeed() {
109 mutable Mutex* m_trackerLock;
111 vector<MetadataProvider*> m_providers;
112 mutable set<tracker_t*> m_trackers;
113 static void tracker_cleanup(void*);
115 friend struct tracker_t;
118 struct SAML_DLLLOCAL tracker_t {
119 tracker_t(const ChainingMetadataProvider* m) : m_metadata(m) {
120 Lock lock(m_metadata->m_trackerLock);
121 m_metadata->m_trackers.insert(this);
124 void lock_if(MetadataProvider* m) {
125 if (m_locked.count(m) == 0)
129 void unlock_if(MetadataProvider* m) {
130 if (m_locked.count(m) == 0)
134 void remember(MetadataProvider* m, const EntityDescriptor* entity=nullptr) {
137 m_objectMap.insert(pair<const XMLObject*,const MetadataProvider*>(entity,m));
140 const MetadataProvider* getProvider(const RoleDescriptor& role) {
141 map<const XMLObject*,const MetadataProvider*>::const_iterator i = m_objectMap.find(role.getParent());
142 return (i != m_objectMap.end()) ? i->second : nullptr;
145 const ChainingMetadataProvider* m_metadata;
146 set<MetadataProvider*> m_locked;
147 map<const XMLObject*,const MetadataProvider*> m_objectMap;
150 MetadataProvider* SAML_DLLLOCAL ChainingMetadataProviderFactory(const DOMElement* const & e)
152 return new ChainingMetadataProvider(e);
155 static const XMLCh _MetadataProvider[] = UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
156 static const XMLCh precedence[] = UNICODE_LITERAL_10(p,r,e,c,e,d,e,n,c,e);
157 static const XMLCh last[] = UNICODE_LITERAL_4(l,a,s,t);
158 static const XMLCh _type[] = UNICODE_LITERAL_4(t,y,p,e);
162 void ChainingMetadataProvider::tracker_cleanup(void* ptr)
165 // free the tracker after removing it from the parent plugin's tracker set
166 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
167 Lock lock(t->m_metadata->m_trackerLock);
168 t->m_metadata->m_trackers.erase(t);
173 ChainingMetadataProvider::ChainingMetadataProvider(const DOMElement* e)
174 : ObservableMetadataProvider(e), m_firstMatch(true), m_trackerLock(nullptr), m_tlsKey(nullptr),
175 m_log(Category::getInstance(SAML_LOGCAT".Metadata.Chaining"))
177 if (XMLString::equals(e ? e->getAttributeNS(nullptr, precedence) : nullptr, last))
178 m_firstMatch = false;
180 e = XMLHelper::getFirstChildElement(e, _MetadataProvider);
182 string t = XMLHelper::getAttrString(e, nullptr, _type);
185 m_log.info("building MetadataProvider of type %s", t.c_str());
186 auto_ptr<MetadataProvider> provider(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(t.c_str(), e));
187 ObservableMetadataProvider* obs = dynamic_cast<ObservableMetadataProvider*>(provider.get());
189 obs->addObserver(this);
190 m_providers.push_back(provider.get());
193 catch (exception& ex) {
194 m_log.error("error building MetadataProvider: %s", ex.what());
197 e = XMLHelper::getNextSiblingElement(e, _MetadataProvider);
199 m_trackerLock = Mutex::create();
200 m_tlsKey = ThreadKey::create(tracker_cleanup);
203 ChainingMetadataProvider::~ChainingMetadataProvider()
206 delete m_trackerLock;
207 for_each(m_trackers.begin(), m_trackers.end(), xmltooling::cleanup<tracker_t>());
208 for_each(m_providers.begin(), m_providers.end(), xmltooling::cleanup<MetadataProvider>());
211 void ChainingMetadataProvider::init()
213 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
217 catch (exception& ex) {
218 m_log.crit("failure initializing MetadataProvider: %s", ex.what());
222 // Set an initial cache tag for the state of the plugins.
223 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
224 m_feedTag = SAMLArtifact::toHex(m_feedTag);
227 Lockable* ChainingMetadataProvider::lock()
229 return this; // we're not lockable ourselves...
232 void ChainingMetadataProvider::unlock()
234 // Check for locked providers and remove role mappings.
235 void* ptr=m_tlsKey->getData();
237 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
238 for_each(t->m_locked.begin(), t->m_locked.end(), mem_fun<void,Lockable>(&Lockable::unlock));
240 t->m_objectMap.clear();
244 const XMLObject* ChainingMetadataProvider::getMetadata() const
246 throw MetadataException("getMetadata operation not implemented on this provider.");
249 const EntitiesDescriptor* ChainingMetadataProvider::getEntitiesDescriptor(const char* name, bool requireValidMetadata) const
251 // Ensure we have a tracker to use.
252 tracker_t* tracker = nullptr;
253 void* ptr=m_tlsKey->getData();
255 tracker = reinterpret_cast<tracker_t*>(ptr);
258 tracker = new tracker_t(this);
259 m_tlsKey->setData(tracker);
262 MetadataProvider* held = nullptr;
263 const EntitiesDescriptor* ret = nullptr;
264 const EntitiesDescriptor* cur = nullptr;
265 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
266 tracker->lock_if(*i);
267 if (cur=(*i)->getEntitiesDescriptor(name,requireValidMetadata)) {
268 // Are we using a first match policy?
270 // Save locked provider.
271 tracker->remember(*i);
275 // Using last match wins. Did we already have one?
277 m_log.warn("found duplicate EntitiesDescriptor (%s), using last matching copy", name);
278 tracker->unlock_if(held);
281 // Save off the latest match.
286 // No match, so just unlock this one and move on.
287 tracker->unlock_if(*i);
291 // Preserve any lock we're holding.
293 tracker->remember(held);
297 pair<const EntityDescriptor*,const RoleDescriptor*> ChainingMetadataProvider::getEntityDescriptor(const Criteria& criteria) const
299 // Ensure we have a tracker to use.
300 tracker_t* tracker = nullptr;
301 void* ptr=m_tlsKey->getData();
303 tracker = reinterpret_cast<tracker_t*>(ptr);
306 tracker = new tracker_t(this);
307 m_tlsKey->setData(tracker);
311 MetadataProvider* held = nullptr;
312 pair<const EntityDescriptor*,const RoleDescriptor*> ret = pair<const EntityDescriptor*,const RoleDescriptor*>(nullptr,nullptr);
313 pair<const EntityDescriptor*,const RoleDescriptor*> cur = ret;
314 for (vector<MetadataProvider*>::const_iterator i=m_providers.begin(); i!=m_providers.end(); ++i) {
315 tracker->lock_if(*i);
316 cur = (*i)->getEntityDescriptor(criteria);
319 // We want a role also. Did we find one?
321 // Are we using a first match policy?
323 // We could have an entity-only match from earlier, so unlock it.
325 tracker->unlock_if(held);
326 // Save locked provider and role mapping.
327 tracker->remember(*i, cur.first);
331 // Using last match wins. Did we already have one?
334 // We had a "complete" match, so log it.
335 if (criteria.entityID_ascii) {
336 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
337 criteria.entityID_ascii, criteria.role->toString().c_str());
339 else if (criteria.entityID_unicode) {
340 auto_ptr_char temp(criteria.entityID_unicode);
341 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
342 temp.get(), criteria.role->toString().c_str());
344 else if (criteria.artifact) {
345 m_log.warn("found duplicate EntityDescriptor for artifact source (%s) with role (%s), using last matching copy",
346 criteria.artifact->getSource().c_str(), criteria.role->toString().c_str());
349 tracker->unlock_if(held);
352 // Save off the latest match.
357 // We didn't find the role, so we're going to keep looking,
358 // but save this one if we didn't have the role yet.
360 // We already had a role, so let's stick with that.
361 tracker->unlock_if(*i);
364 // This is at least as good, so toss anything we had and keep it.
366 tracker->unlock_if(held);
373 // Are we using a first match policy?
375 // I don't think this can happen, but who cares, check anyway.
377 tracker->unlock_if(held);
379 // Save locked provider.
380 tracker->remember(*i, cur.first);
384 // Using last match wins. Did we already have one?
386 if (criteria.entityID_ascii) {
387 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", criteria.entityID_ascii);
389 else if (criteria.entityID_unicode) {
390 auto_ptr_char temp(criteria.entityID_unicode);
391 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", temp.get());
393 else if (criteria.artifact) {
394 m_log.warn("found duplicate EntityDescriptor for artifact source (%s), using last matching copy",
395 criteria.artifact->getSource().c_str());
397 tracker->unlock_if(held);
400 // Save off the latest match.
406 // No match, so just unlock this one and move on.
407 tracker->unlock_if(*i);
411 // Preserve any lock we're holding.
413 tracker->remember(held, ret.first);
417 const Credential* ChainingMetadataProvider::resolve(const CredentialCriteria* criteria) const
419 void* ptr=m_tlsKey->getData();
421 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
422 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
424 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
426 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
427 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
429 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
430 return m->resolve(mcc);
433 vector<const Credential*>::size_type ChainingMetadataProvider::resolve(
434 vector<const Credential*>& results, const CredentialCriteria* criteria
437 void* ptr=m_tlsKey->getData();
439 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
440 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
442 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
444 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
445 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
447 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
448 return m->resolve(results, mcc);