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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 <boost/bind.hpp>
38 #include <boost/ptr_container/ptr_vector.hpp>
39 #include <xercesc/util/XMLUniDefs.hpp>
40 #include <xmltooling/logging.h>
41 #include <xmltooling/util/Threads.h>
42 #include <xmltooling/util/XMLHelper.h>
45 using namespace opensaml::saml2md;
46 using namespace opensaml;
47 using namespace xmlsignature;
48 using namespace xmltooling::logging;
49 using namespace xmltooling;
50 using namespace boost;
56 // per-thread structure allocated to track locks and role->provider mappings
57 struct SAML_DLLLOCAL tracker_t;
59 class SAML_DLLLOCAL ChainingMetadataProvider
60 : public DiscoverableMetadataProvider, public ObservableMetadataProvider, public ObservableMetadataProvider::Observer {
62 ChainingMetadataProvider(const xercesc::DOMElement* e=nullptr);
63 virtual ~ChainingMetadataProvider();
65 using MetadataProvider::getEntityDescriptor;
66 using MetadataProvider::getEntitiesDescriptor;
71 void outputStatus(ostream& os) const;
72 const XMLObject* getMetadata() const;
73 const EntitiesDescriptor* getEntitiesDescriptor(const char* name, bool requireValidMetadata=true) const;
74 pair<const EntityDescriptor*,const RoleDescriptor*> getEntityDescriptor(const Criteria& criteria) const;
76 const Credential* resolve(const CredentialCriteria* criteria=nullptr) const;
77 vector<const Credential*>::size_type resolve(vector<const Credential*>& results, const CredentialCriteria* criteria=nullptr) const;
79 string getCacheTag() const {
80 Lock lock(m_trackerLock.get());
84 void outputFeed(ostream& os, bool& first, bool wrapArray=true) const {
87 // Lock each provider in turn and suck in its feed.
88 for (ptr_vector<MetadataProvider>::iterator m = m_providers.begin(); m != m_providers.end(); ++m) {
89 DiscoverableMetadataProvider* d = dynamic_cast<DiscoverableMetadataProvider*>(&(*m));
92 d->outputFeed(os, first, false);
99 void onEvent(const ObservableMetadataProvider& provider) const {
100 // Reset the cache tag for the feed.
101 Lock lock(m_trackerLock.get());
102 SAMLConfig::getConfig().generateRandomBytes(m_feedTag, 4);
103 m_feedTag = SAMLArtifact::toHex(m_feedTag);
108 void generateFeed() {
114 auto_ptr<Mutex> m_trackerLock;
115 auto_ptr<ThreadKey> m_tlsKey;
116 mutable ptr_vector<MetadataProvider> m_providers;
117 mutable set<tracker_t*> m_trackers;
118 static void tracker_cleanup(void*);
120 friend struct tracker_t;
123 struct SAML_DLLLOCAL tracker_t {
124 tracker_t(const ChainingMetadataProvider* m) : m_metadata(m) {
125 Lock lock(m_metadata->m_trackerLock.get());
126 m_metadata->m_trackers.insert(this);
129 void lock_if(MetadataProvider* m) {
130 if (m_locked.count(m) == 0)
134 void unlock_if(MetadataProvider* m) {
135 if (m_locked.count(m) == 0)
139 void remember(MetadataProvider* m, const EntityDescriptor* entity=nullptr) {
142 m_objectMap.insert(pair<const XMLObject*,const MetadataProvider*>(entity,m));
145 const MetadataProvider* getProvider(const RoleDescriptor& role) {
146 map<const XMLObject*,const MetadataProvider*>::const_iterator i = m_objectMap.find(role.getParent());
147 return (i != m_objectMap.end()) ? i->second : nullptr;
150 const ChainingMetadataProvider* m_metadata;
151 set<MetadataProvider*> m_locked;
152 map<const XMLObject*,const MetadataProvider*> m_objectMap;
155 MetadataProvider* SAML_DLLLOCAL ChainingMetadataProviderFactory(const DOMElement* const & e)
157 return new ChainingMetadataProvider(e);
160 static const XMLCh _MetadataProvider[] = UNICODE_LITERAL_16(M,e,t,a,d,a,t,a,P,r,o,v,i,d,e,r);
161 static const XMLCh precedence[] = UNICODE_LITERAL_10(p,r,e,c,e,d,e,n,c,e);
162 static const XMLCh last[] = UNICODE_LITERAL_4(l,a,s,t);
163 static const XMLCh _type[] = UNICODE_LITERAL_4(t,y,p,e);
167 void ChainingMetadataProvider::tracker_cleanup(void* ptr)
170 // free the tracker after removing it from the parent plugin's tracker set
171 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
172 Lock lock(t->m_metadata->m_trackerLock.get());
173 t->m_metadata->m_trackers.erase(t);
178 ChainingMetadataProvider::ChainingMetadataProvider(const DOMElement* e)
179 : ObservableMetadataProvider(e), m_firstMatch(true), m_trackerLock(Mutex::create()), m_tlsKey(ThreadKey::create(tracker_cleanup)),
180 m_log(Category::getInstance(SAML_LOGCAT".Metadata.Chaining"))
182 if (XMLString::equals(e ? e->getAttributeNS(nullptr, precedence) : nullptr, last))
183 m_firstMatch = false;
185 e = XMLHelper::getFirstChildElement(e, _MetadataProvider);
187 string t = XMLHelper::getAttrString(e, nullptr, _type);
190 m_log.info("building MetadataProvider of type %s", t.c_str());
191 auto_ptr<MetadataProvider> provider(SAMLConfig::getConfig().MetadataProviderManager.newPlugin(t.c_str(), e));
192 ObservableMetadataProvider* obs = dynamic_cast<ObservableMetadataProvider*>(provider.get());
194 obs->addObserver(this);
195 m_providers.push_back(provider.get());
198 catch (exception& ex) {
199 m_log.error("error building MetadataProvider: %s", ex.what());
202 e = XMLHelper::getNextSiblingElement(e, _MetadataProvider);
206 ChainingMetadataProvider::~ChainingMetadataProvider()
208 for_each(m_trackers.begin(), m_trackers.end(), xmltooling::cleanup<tracker_t>());
211 void ChainingMetadataProvider::init()
213 for (ptr_vector<MetadataProvider>::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 void ChainingMetadataProvider::outputStatus(ostream& os) const
229 for_each(m_providers.begin(), m_providers.end(), boost::bind(&MetadataProvider::outputStatus, _1, boost::ref(os)));
232 Lockable* ChainingMetadataProvider::lock()
234 return this; // we're not lockable ourselves...
237 void ChainingMetadataProvider::unlock()
239 // Check for locked providers and remove role mappings.
240 void* ptr=m_tlsKey->getData();
242 tracker_t* t = reinterpret_cast<tracker_t*>(ptr);
243 for_each(t->m_locked.begin(), t->m_locked.end(), mem_fun(&Lockable::unlock));
245 t->m_objectMap.clear();
249 const XMLObject* ChainingMetadataProvider::getMetadata() const
251 throw MetadataException("getMetadata operation not implemented on this provider.");
254 const EntitiesDescriptor* ChainingMetadataProvider::getEntitiesDescriptor(const char* name, bool requireValidMetadata) const
256 // Ensure we have a tracker to use.
257 tracker_t* tracker = nullptr;
258 void* ptr=m_tlsKey->getData();
260 tracker = reinterpret_cast<tracker_t*>(ptr);
263 tracker = new tracker_t(this);
264 m_tlsKey->setData(tracker);
267 MetadataProvider* held = nullptr;
268 const EntitiesDescriptor* ret = nullptr;
269 const EntitiesDescriptor* cur = nullptr;
270 for (ptr_vector<MetadataProvider>::iterator i = m_providers.begin(); i != m_providers.end(); ++i) {
271 tracker->lock_if(&(*i));
272 if (cur=i->getEntitiesDescriptor(name,requireValidMetadata)) {
273 // Are we using a first match policy?
275 // Save locked provider.
276 tracker->remember(&(*i));
280 // Using last match wins. Did we already have one?
282 m_log.warn("found duplicate EntitiesDescriptor (%s), using last matching copy", name);
283 tracker->unlock_if(held);
286 // Save off the latest match.
291 // No match, so just unlock this one and move on.
292 tracker->unlock_if(&(*i));
296 // Preserve any lock we're holding.
298 tracker->remember(held);
302 pair<const EntityDescriptor*,const RoleDescriptor*> ChainingMetadataProvider::getEntityDescriptor(const Criteria& criteria) const
304 // Ensure we have a tracker to use.
305 tracker_t* tracker = nullptr;
306 void* ptr=m_tlsKey->getData();
308 tracker = reinterpret_cast<tracker_t*>(ptr);
311 tracker = new tracker_t(this);
312 m_tlsKey->setData(tracker);
316 MetadataProvider* held = nullptr;
317 pair<const EntityDescriptor*,const RoleDescriptor*> ret = pair<const EntityDescriptor*,const RoleDescriptor*>(nullptr,nullptr);
318 pair<const EntityDescriptor*,const RoleDescriptor*> cur = ret;
319 for (ptr_vector<MetadataProvider>::iterator i = m_providers.begin(); i != m_providers.end(); ++i) {
320 tracker->lock_if(&(*i));
321 cur = i->getEntityDescriptor(criteria);
324 // We want a role also. Did we find one?
326 // Are we using a first match policy?
328 // We could have an entity-only match from earlier, so unlock it.
330 tracker->unlock_if(held);
331 // Save locked provider and role mapping.
332 tracker->remember(&(*i), cur.first);
336 // Using last match wins. Did we already have one?
339 // We had a "complete" match, so log it.
340 if (criteria.entityID_ascii) {
341 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
342 criteria.entityID_ascii, criteria.role->toString().c_str());
344 else if (criteria.entityID_unicode) {
345 auto_ptr_char temp(criteria.entityID_unicode);
346 m_log.warn("found duplicate EntityDescriptor (%s) with role (%s), using last matching copy",
347 temp.get(), criteria.role->toString().c_str());
349 else if (criteria.artifact) {
350 m_log.warn("found duplicate EntityDescriptor for artifact source (%s) with role (%s), using last matching copy",
351 criteria.artifact->getSource().c_str(), criteria.role->toString().c_str());
354 tracker->unlock_if(held);
357 // Save off the latest match.
362 // We didn't find the role, so we're going to keep looking,
363 // but save this one if we didn't have the role yet.
365 // We already had a role, so let's stick with that.
366 tracker->unlock_if(&(*i));
369 // This is at least as good, so toss anything we had and keep it.
371 tracker->unlock_if(held);
378 // Are we using a first match policy?
380 // I don't think this can happen, but who cares, check anyway.
382 tracker->unlock_if(held);
384 // Save locked provider.
385 tracker->remember(&(*i), cur.first);
389 // Using last match wins. Did we already have one?
391 if (criteria.entityID_ascii) {
392 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", criteria.entityID_ascii);
394 else if (criteria.entityID_unicode) {
395 auto_ptr_char temp(criteria.entityID_unicode);
396 m_log.warn("found duplicate EntityDescriptor (%s), using last matching copy", temp.get());
398 else if (criteria.artifact) {
399 m_log.warn("found duplicate EntityDescriptor for artifact source (%s), using last matching copy",
400 criteria.artifact->getSource().c_str());
402 tracker->unlock_if(held);
405 // Save off the latest match.
411 // No match, so just unlock this one and move on.
412 tracker->unlock_if(&(*i));
416 // Preserve any lock we're holding.
418 tracker->remember(held, ret.first);
422 const Credential* ChainingMetadataProvider::resolve(const CredentialCriteria* criteria) const
424 void* ptr=m_tlsKey->getData();
426 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
427 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
429 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
431 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
432 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
434 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
435 return m->resolve(mcc);
438 vector<const Credential*>::size_type ChainingMetadataProvider::resolve(
439 vector<const Credential*>& results, const CredentialCriteria* criteria
442 void* ptr=m_tlsKey->getData();
444 throw MetadataException("No locked MetadataProvider, where did the role object come from?");
445 tracker_t* tracker=reinterpret_cast<tracker_t*>(ptr);
447 const MetadataCredentialCriteria* mcc = dynamic_cast<const MetadataCredentialCriteria*>(criteria);
449 throw MetadataException("Cannot resolve credentials without a MetadataCredentialCriteria object.");
450 const MetadataProvider* m = tracker->getProvider(mcc->getRole());
452 throw MetadataException("No record of corresponding MetadataProvider, where did the role object come from?");
453 return m->resolve(results, mcc);